Angle fastening tool

Abstract

To improve the operability of angle fastening tools. [Solution] The angle fastening tool comprises a grip portion extending in the front-rear direction, a motor housing portion positioned in front of the grip portion, a motor positioned inside the motor housing portion, a spindle positioned in front of the motor and extending in a direction intersecting the front-rear direction and rotated by the motor, a tip tool holder portion rotated by the spindle, a trigger lever provided on the grip portion, and a switch board positioned in front of the trigger lever and overlapping with the motor in the vertical direction.

Description

Technical Field

[0001] The technology disclosed in this specification relates to an angle fastening tool.

Background Art

[0002] Pistol-type electric fastening tools are known. There is also an angle fastening tool that enables fastening work in a narrow space where the tip of a pistol-type electric fastening tool cannot enter. In the angle fastening tool, the rotation axis and the output axis of the motor intersect and are non-parallel. The angle fastening tool has a rod-like shape with a bent tip, and the tip can be inserted into a narrow working location to perform tightening work.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the angle fastening tool is rod-shaped, the output shaft is separated from the grip, and the directions of the grip and the output shaft are different, the feeling of use is quite different from that of a pistol-type electric fastening tool. In the fastening work, the tool is operated while applying force in a direction to rotate the tip side around the gripped grip. It is desirable to improve the operability (ease of handling) of the angle fastening tool.

[0005] The technology disclosed in this specification aims to improve the operability of an angle fastening tool.

Means for Solving the Problems

[0006] This specification discloses an angle fastening tool. The angle fastening tool may include a grip portion extending in the front-rear direction, a motor housing portion positioned in front of the grip portion, a motor positioned inside the motor housing portion, a spindle positioned in front of the motor and extending in a direction intersecting the front-rear direction and rotated by the motor, a tip tool holder portion rotated by the spindle, a trigger lever provided on the grip portion, and a switch board positioned in front of the trigger lever and overlapping with the motor in the vertical direction. [Effects of the Invention]

[0007] The above configuration makes it possible to improve the operability of the angle fastening tool. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing an angle fastening tool according to an embodiment. [Figure 2] Figure 2 is a side view showing an angle fastening tool according to an embodiment. [Figure 3] Figure 3 is a bottom view showing an angle fastening tool according to an embodiment. [Figure 4] Figure 4 is a longitudinal cross-sectional view showing an angle fastening tool according to an embodiment. [Figure 5] Figure 5 is a longitudinal cross-sectional view showing the motor housing portion of the angle fastening tool according to the embodiment. [Figure 6] Figure 6 is a longitudinal cross-sectional view showing the case of an angle fastening tool according to an embodiment. [Figure 7] Figure 7 is a cross-sectional view of the angle fastening tool according to the embodiment, taken in the left-right direction along the anvil. [Figure 8] Figure 8 is a perspective view showing the operation panel according to the embodiment. [Figure 9] Figure 9 is a schematic diagram showing the installation of a battery into the battery holder according to the embodiment. [Figure 10] Figure 10 is a longitudinal cross-sectional view along the front-to-back direction showing a light unit according to an embodiment. [Figure 11] Figure 11 is an exploded perspective view showing the structure of the light unit according to the embodiment. [Figure 12] Figure 12 is a perspective view from below showing the front part of the angle fastening tool according to the embodiment. [Figure 13] Figure 13 is an exploded perspective view from below showing the attachment of the light cover to the case according to the embodiment. [Figure 14] Figure 14 is a perspective view from below showing the case according to the embodiment. [Figure 15] Figure 15 is a bottom view of the case with the light cover removed. [Figure 16] Figure 16 is a perspective view showing the light cover. [Figure 17] Figure 17 is a perspective view from below showing the operation panel in a divided state of the housing. [Figure 18] Figure 18 is a perspective view of the housing showing the holding structure of the operation panel. [Figure 19] Figure 19 is a side view of the first housing showing the holding structure of the operation panel. [Figure 20] Figure 20 is a side view of the second housing showing the holding structure of the operation panel. [Figure 21] Figure 21 is a horizontal cross-sectional view of the housing showing the holding structure of the operation panel. [Figure 22] Figure 22 is a cross-sectional view of the housing along the left-right direction showing the holding structure of the operation panel. [Figure 23] Figure 23 is an exploded perspective view of the operation panel seen from above. [Figure 24] Figure 24 is an exploded perspective view of the operation panel seen from below. [Figure 25] Figure 25 is a longitudinal cross-sectional view passing through the engaging claws of the operation panel. [Figure 26] Figure 26 is a longitudinal cross-sectional view showing the periphery of the bevel gear of the angle fastening tool according to the embodiment. [Figure 27] Figure 27 is an exploded perspective view showing the rear surface of the case according to the embodiment. [Figure 28] Figure 28 is an exploded perspective view showing the front face of the motor housing part according to the embodiment. [Figure 29] Figure 29 is an exploded perspective view showing the bevel gear, bearing, and intermediate support member according to the embodiment. [Figure 30] Figure 30 is a longitudinal sectional view showing the intermediate support member according to the embodiment. [Figure 31] Figure 31 is an exploded perspective view showing the rotor sub-assembly according to the embodiment. [Figure 32] Figure 32 is a perspective view showing the intermediate support member according to the second embodiment. [Figure 33] Figure 33 is an exploded perspective view showing the motor sub-assembly according to the second embodiment. [Figure 34] Figure 34 is a sectional view showing the intermediate support member according to the third embodiment. [Figure 35] Figure 35 is a sectional view showing the intermediate support member according to the fourth embodiment. [Figure 36] Figure 36 is a longitudinal sectional view showing the periphery of the intermediate support member according to the fourth embodiment. [Figure 37] Figure 37 is a longitudinal sectional view showing the intermediate support member and the fixing member according to the fifth embodiment. [Figure 38] Figure 38 is a longitudinal sectional view showing the front part of the angle fastening tool according to the sixth embodiment. [Figure 39] Figure 39 is a perspective view from below showing the front part of the angle fastening tool according to the seventh embodiment. [Figure 40] Figure 40 is a bottom view showing the front part of the angle fastening tool according to the seventh embodiment. [Figure 41] Figure 41 is an exploded perspective view from below showing the attachment of the light cover to the case according to the seventh embodiment. [Figure 42] Figure 42 is a longitudinal sectional view along the front-rear direction showing the light unit according to the seventh embodiment. [Figure 43]Figure 43 is a bottom view showing the front of the angle fastening tool with the light cover removed according to the seventh embodiment. [Figure 44] Figure 44 is a longitudinal cross-sectional view showing the front part of the angle fastening tool according to the seventh embodiment. [Figure 45] Figure 45 is a longitudinal cross-sectional view showing an angle fastening tool according to the seventh embodiment. [Figure 46] Figure 46 is a longitudinal cross-sectional view showing the middle portion of the angle fastening tool according to the seventh embodiment. [Figure 47] Figure 47 is a longitudinal cross-sectional view illustrating the vertical positional relationship of each part of the angle fastening tool according to the seventh embodiment. [Figure 48] Figure 48 is a perspective view of the battery holding portion of the angle fastening tool according to the seventh embodiment, viewed from the rear and diagonally above. [Figure 49] Figure 49 is a longitudinal cross-sectional view illustrating the front-to-back positional relationship of each part of the angle fastening tool according to the seventh embodiment. [Figure 50] Figure 50 is a cross-sectional view of the grip portion according to the seventh embodiment, seen from the front. [Figure 51] Figure 51 is a longitudinal cross-sectional view showing a modified arrangement of the control panel. [Modes for carrying out the invention]

[0009] In one or more embodiments, the angle fastening tool may include a grip portion extending in the front-rear direction, a motor housing portion positioned in front of the grip portion, a motor positioned inside the motor housing portion, a spindle positioned in front of the motor and extending in a direction intersecting the front-rear direction and rotated by the motor, a tip tool holder portion rotated by the spindle, a trigger lever provided on the grip portion, and a switch board positioned in front of the trigger lever and overlapping with the motor in the vertical direction.

[0010] In the above configuration, the front-to-back position of the switch board can be brought closer to the motor so that the switch board overlaps with the motor in the vertical direction. Accordingly, the trigger lever can also be positioned near the rear of the switch board. By bringing the switch board, motor, and trigger lever closer together in the front-to-back direction, the overall length of the angle fastening tool can be reduced while improving the operability of the trigger lever and switch operation. As a result, the operability of the angle fastening tool can be improved.

[0011] In one or more embodiments, the switch board may have a front end that overlaps with the rear of the motor in the vertical direction, and a rear end that overlaps with the front of the trigger lever in the vertical direction.

[0012] In the above configuration, the switch board, motor, and trigger lever can be brought sufficiently close together in the front-to-back direction. By consolidating these components near the gripping point, the overall length of the angle fastening tool can be reduced while effectively improving the operability of the trigger lever and switch operation.

[0013] In one or more embodiments, the motor may have a stator and a rotor rotatable relative to the stator. Angle fastening tools may further include bearings positioned in front of and behind the rotor, respectively, to rotatably support the rotor. The front-to-back distance between the trigger lever and the rear bearing may be less than the front-to-back length of the switch board.

[0014] In the above configuration, the trigger lever can be positioned closer to the rear bearing that supports the motor's rotation. This reduces the overall length of the angle fastening tool, and by positioning the heavy motor component near the trigger lever, the center of gravity of the angle fastening tool can be brought closer to the trigger lever. As a result, the tip tool holder becomes easier to move, improving the handling of the angle fastening tool.

[0015] In one or more embodiments, the angle fastening tool may further include a controller connected to the switch board via wiring and located behind the switch board.

[0016] In the above configuration, by positioning the controller behind the switch board, it is not necessary to position the controller below the switch board. As a result, the space below the switch board (between the motor and the trigger lever) can be shortened in both the front and back directions.

[0017] In one or more embodiments, the angle fastening tool may further include a battery holder connected to the rear end of the grip portion for detachably holding a battery. The controller may be located in the battery holder.

[0018] In the above configuration, the battery holder where the battery is installed can be used to secure space for housing the controller. Even when the controller is positioned behind the switch board, the overall length of the angle fastening tool can be kept from increasing.

[0019] In one or more embodiments, the front-to-back distance between the trigger lever and the motor may be smaller than the front-to-back distance between the trigger lever and the controller.

[0020] In the above configuration, the distance from the trigger lever to the motor on the front side can be shortened compared to the distance from the trigger lever to the controller on the rear side. As a result, the overall length of the angle fastening tool can be reduced. When the heavy battery is attached to the battery holder, it is easier to balance the weight between the front and rear sides of the trigger lever, improving the handling of the angle fastening tool.

[0021] In one or more embodiments, the switch board may have an operating button. The trigger lever may include a pressing surface that is pressed when pulled, and a pivot shaft that rotates the pressing surface as it is pressed. In the front-rear direction, the distance from the center of the pivot shaft to the operating button may be less than the distance from the center of the pivot shaft to the rear end of the pressing surface.

[0022] In the above configuration, the operating button can be brought sufficiently close to the trigger lever. Therefore, while the operator is gripping the handle, the operability of both the pulling operation of the trigger lever's pressing surface and the pressing operation of the operating button can be improved.

[0023] In one or more embodiments, the motor may have a stator and a rotor rotatable relative to the stator. The switch board may overlap both the stator and the rotor in the vertical direction.

[0024] In the above configuration, the switch board and motor can be brought even closer together in the front-to-back direction, thus reducing the overall length of the angle fastening tool. The center of gravity of the angle fastening tool can be brought closer to the trigger lever, improving the handling of the angle fastening tool.

[0025] In one or more embodiments, the spindle may extend downward along a rotation axis perpendicular to the front-rear direction.

[0026] In the above configuration, the lower end of the angle fastening tool, where the spindle is located, can be positioned in front of the work area for tightening.

[0027] In one or more embodiments, the angle fastening tool may further include a hammer that moves relative to a spindle, and an anvil that is struck directly or indirectly in the rotational direction by the hammer. A tip tool holder may be located at the lower end of the anvil.

[0028] With the above configuration, an impact tool is realized that can achieve high tightening torque through hammer strikes, even with an angle fastening tool suitable for working in confined spaces. Even when the hammer is positioned at the front end of the angle fastening tool, the switch board, motor, and trigger lever can be brought closer together in the front-to-back direction, resulting in good weight balance and improved maneuverability.

[0029] In one or more embodiments, the angle fastening tool may further include an operating panel including a housing that includes a grip portion and a motor housing portion, a switch board, a switch mounted on the switch board, and a switch plate attached to the switch board so as to surround at least a portion of the switch. The housing may have a panel opening in which the switch plate is placed, and a retaining groove formed on the inner surface of the housing. The switch board may be held in the housing by a portion of the switch board being inserted into the retaining groove.

[0030] In the above configuration, the switch board, which is subjected to external forces during switch operation, can be directly held by the housing. However, if the switch plate is held by the housing, the switch board and switch plate must be firmly fixed with screws or other means to withstand the external forces, and then the switch plate must be fixed to the housing, resulting in a larger structure around the switch. In contrast, in the above configuration, the external forces acting on the switch board are supported by the housing, so the switch plate does not need to support the external forces, and the fixing of the switch plate can be simplified. Therefore, the structure around the switch can be simplified and miniaturized.

[0031] In one or more embodiments, the angle fastening tool may include a grip portion extending in the front-rear direction, a motor housing portion positioned in front of the grip portion, a motor positioned inside the motor housing portion, a spindle positioned in front of the motor and extending in a direction intersecting the front-rear direction and rotated by the motor, a tip tool holder portion rotated by the spindle, a trigger lever provided on the grip portion, a switch board on which a switch is provided, and a controller connected to the motor, switch board and trigger lever via wiring. The motor, switch board, trigger lever and controller may be arranged in the order from front to rear.

[0032] In the above configuration, the controller is positioned behind the motor, switch board, and trigger lever. Since the switch board is positioned near the surface of the housing, the distance between the motor and trigger lever can be shortened because the controller is not positioned near the switch board between the motor and trigger lever. Because the switch board, motor, and trigger lever can be brought closer together in the front-to-back direction, the overall length of the angle fastening tool can be reduced while improving the operability of the trigger lever and switch operation. As a result, the operability of the angle fastening tool can be improved.

[0033] In one or more embodiments, the motor may have a stator and a rotor rotatable relative to the stator. Angle fastening tools may further include bearings positioned in front of and behind the rotor, respectively, to rotatably support the rotor. The front end of the switch board may be positioned in front of the rear bearing.

[0034] In the above configuration, the switch board can be brought closer to the motor, allowing the switch board, motor, and trigger lever to be brought even closer together.

[0035] In one or more embodiments, the front end of the switch board may be positioned in front of the rear end of the motor.

[0036] In the above configuration, the switch board overlaps with the motor in the vertical direction. This further reduces the distance between the motor, the switch board, and the trigger lever.

[0037] In one or more embodiments, the angle fastening tool may further include a battery holder connected to the rear end of the grip portion for detachably holding a battery. The controller may be located in the battery holder.

[0038] In the above configuration, the battery holder where the battery is installed can be used to secure space for housing the controller. Compared to housing the controller inside the grip, the external dimensions (circumference) of the grip do not increase, making the grip easier to hold. As a result, the handling of the angle fastening tool is improved.

[0039] In one or more embodiments, the front-to-back distance between the trigger lever and the motor may be smaller than the front-to-back distance between the trigger lever and the controller.

[0040] In the above configuration, the distance from the trigger lever to the motor on the front side can be shortened compared to the distance from the trigger lever to the controller on the rear side. As a result, the overall length of the angle fastening tool can be reduced. When the heavy battery is attached to the battery holder, it is easier to balance the weight between the front and rear sides of the trigger lever, improving the handling of the angle fastening tool.

[0041] In one or more embodiments, the angle fastening tool may further include a battery holder connected to the rear end of the grip portion for detachably holding the battery. With the battery installed, the center of gravity of the angle fastening tool may be located between the front and rear ends of the switch board in the front-rear direction.

[0042] In the above configuration, the center of gravity of the angle fastening tool is located between the front and rear ends of the switch board, and is also close to the trigger lever. In other words, since the center of gravity of the angle fastening tool is closer to the gripping and operating points, the operability of the angle fastening tool is improved. In addition, it is easier to stabilize the position of the tip tool holder during fastening work.

[0043] [Note] In one or more embodiments, the configuration may have the following features: [Feature 1] Housing and The device includes an operation panel comprising a switch board, switches mounted on the switch board, and a switch plate attached to the switch board so as to surround at least a portion of the switches, The housing has a panel opening in which the switch plate is placed, and a retaining groove formed on the inner surface of the housing. The switch board is held in the housing by a portion of the switch board being inserted into the retaining groove. Electric work equipment.

[0044] [Feature 2] In the electric work machine described in Feature 1, The housing is configured by connecting a first housing, which includes the panel opening and the first portion of the retaining groove, and a second housing, which includes the panel opening and the second portion of the retaining groove, The retaining groove is provided on at least one of the one end and the other end of the switch substrate on the mating surface of the first housing and the second housing, and extends in a first direction perpendicular to the mating surface.

[0045] [Feature 3] In the electric work machine described in Feature 2, The retaining grooves are provided on both one end and the other end of the switch board.

[0046] [Feature 4] In the electric work machine described in Feature 2, The first portion of the retaining groove has a first clearance with the switch substrate in a second direction connecting one end and the other end of the switch substrate in a cross-section along the mating surface, The second portion of the retaining groove has a second clearance in the second direction that is greater than the first clearance between it and the switch substrate.

[0047] [Feature 5] In the electric work machine described in Feature 2, At least one of the first housing and the second housing has a support surface for supporting the switch board at a position adjacent to the switch board on the side opposite to the panel opening, The support surface is provided at a position that contacts the edge of the switch substrate in the first direction.

[0048] [Feature 6] In the electric work machine described in Feature 5, Both the first housing and the second housing have the support surface.

[0049] [Feature 7] In the electric work machine described in Feature 5, The retaining groove has a protrusion that projects toward the surface of the switch substrate on which the switch is mounted, The aforementioned protrusion is in close contact with the surface of the switch substrate, undergoing elastic deformation.

[0050] [Feature 8] In the electric work machine described in Feature 1, The switch plate has a plate portion and a first engaging claw and a second engaging claw provided on the outer circumference of the plate portion at mutually opposing positions, which engage with the switch substrate, respectively.

[0051] [Feature 9] In the electric work machine described in Feature 8, The first engaging claw has an L-shape that allows the switch substrate to be positioned between the plate portion and the first engaging claw. The second engaging claw has a snap-fit ​​shape that allows it to engage with and disengage from the switch substrate by elastic deformation.

[0052] [Feature 10] In the electric work machine described in Feature 9, The width of the first engaging claw is greater than the width of the second engaging claw.

[0053] [Feature 11] In the electric work machine described in Feature 9, The protrusion height of the first engaging claw from the plate portion is smaller than the protrusion height of the second engaging claw from the plate portion.

[0054] [Feature 12] In the electric work machine described in Feature 8, The outer periphery of the switch board is formed with a first notch where a part of the first engaging claw is positioned, and a second notch where a part of the second engaging claw is positioned.

[0055] [Feature 13] In the electric work machine described in Feature 1, The switch plate comprises a plate portion having a thickness greater than that of the switch, and a switch label provided on the surface of the plate portion that covers the switch. The switch label has a convex cross-sectional shape including the top surface and corners.

[0056] [Feature 14] In the electric work machine described in Feature 13, The aforementioned plate portion has a central portion that is recessed relative to the peripheral portion, The switch label is positioned in the central part of the plate portion. The height of the peripheral portion protruding from the switch substrate is greater than the height of the top surface of the switch label protruding from the switch substrate.

[0057] The electric work equipment relating to the configurations of these features 1 to 14 may be electric fastening tools other than angle fastening tools, or electric tools other than electric fastening tools. The electric work equipment may be something other than an electric tool.

[0058] The embodiments will be described below with reference to the drawings. In the embodiments, the positional relationships of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate the relative position or direction with respect to the center of the angle fastening tool.

[0059] [First Embodiment] Figure 1 is a perspective view showing the angle fastening tool 1 according to the embodiment. Figure 2 is a side view showing the angle fastening tool 1 according to the embodiment. Figure 3 is a bottom view showing the angle fastening tool 1 according to the embodiment. Figure 4 is a longitudinal cross-sectional view showing the angle fastening tool 1 according to the embodiment. Figure 5 is a longitudinal cross-sectional view showing the motor housing portion 21 of the angle fastening tool 1 according to the embodiment. Figure 6 is a longitudinal cross-sectional view showing the case 4 of the angle fastening tool 1 according to the embodiment. Figure 7 is a cross-sectional view of the angle fastening tool 1 according to the embodiment in the left-right direction along the anvil 10.

[0060] In this embodiment, the angle fastening tool 1 is an electric tool having an electric motor 6 as a power source. The direction parallel to the rotation axis AX of the motor 6 is appropriately referred to as the axial direction, the direction that circles around the rotation axis AX is appropriately referred to as the circumferential direction or rotational direction, and the radial direction of the rotation axis AX is appropriately referred to as the radial direction. Furthermore, in the radial direction, the position close to or approaching the rotation axis AX is appropriately referred to as the radially inner or inner circumferential side, and the position far from or moving away from the rotation axis AX is appropriately referred to as the radially outer or outer circumferential side. In this embodiment, the rotation axis AX extends in the front-rear direction. One side in the axial direction is the front side, and the other side in the axial direction is the rear side.

[0061] In this embodiment, the angle fastening tool 1 is an angle impact wrench. The angle fastening tool 1 comprises a housing 2, a case 4, a motor 6, a reduction gear 7, a spindle 8, a striking mechanism 9, an anvil 10, a fan 12, a battery mounting section 13, a trigger lever 14, a forward / reverse switching lever 15, an operation panel 16, a light unit 17, and a controller 18.

[0062] Housing 2 is made of synthetic resin. Housing 2 consists of a pair of split housings, left and right. The pair of split housings are fixed together by multiple screws 2S.

[0063] The housing 2 includes a motor housing section 21, a grip section 22, and a battery holding section 23.

[0064] The motor housing section 21 constitutes the front part of the housing 2. The motor housing section 21 is positioned in front of the grip section 22. The motor housing section 21 is cylindrical. The motor housing section 21 houses the motor 6. The motor housing section 21 houses the motor 6, the fan 12, and the bearing 38R. The operation panel 16 is provided on the upper part of the motor housing section 21.

[0065] The grip portion 22 extends in the front-rear direction. The grip portion 22 extends rearward from the motor housing portion 21. The grip portion 22 is held by the operator. The grip portion 22 is provided with a trigger lever 14 and a grip 22A. The trigger lever 14 is located at the front of the grip portion 22. The trigger lever 14 is located at the front end of the grip portion 22. The trigger lever 14 is located at the bottom of the grip portion 22. The grip 22A is located rearward from the trigger lever 14. The grip 22A is columnar. The grip 22A is the part of the grip portion 22 that is held by the operator. The grip 22A is longer in the front-rear direction than the trigger lever 14. The lower surface of the grip 22A is located above the lower surface 21P of the motor housing portion 21.

[0066] As shown in Figure 2, the circumference of the narrowest part 22N of the grip portion 22 is smaller than the circumference of the narrowest part 21N of the motor housing portion 21. The circumference of the narrowest part 22N of the grip portion 22 is, for example, 150 mm or less, preferably 140 mm or less, more preferably 130 mm or less, and even more preferably 120 mm or less. In the example of Figure 3, the narrowest part 22N of the grip portion 22 is the rear end of the grip portion 22 (the connection part with the battery holding portion 23), and the circumference of the grip portion 22 is, for example, 115 mm. The circumference of the narrowest part 21N of the motor housing portion 21 is, for example, 200 mm or less, preferably 180 mm or less, more preferably 160 mm or less, and even more preferably 155 mm or less. In the example of Figure 3, the circumference of the narrowest part 21N of the motor housing portion 21 is 200 mm.

[0067] The battery holder 23 is connected to the rear end of the grip portion 22. The battery holder 23 houses the controller 18. The battery holder 23 holds the battery 25. The battery 25 is mounted in the battery mounting portion 13 provided on the lower surface of the battery holder 23.

[0068] The motor housing section 21 has an air intake port 19 and an exhaust port 20. The air intake port 19 and the exhaust port 20 are provided on the left and right sides of the motor housing section 21. Air from the external space of the housing 2 flows into the internal space of the housing 2 through the air intake port 19. Air from the internal space of the housing 2 flows out into the external space of the housing 2 through the exhaust port 20.

[0069] The housing 2 and case 4 are aligned in the front-to-back direction. The motor housing section 21 and case 4 are connected in the front-to-back direction. The front of the housing 2 and the rear of the case 4 are connected. The housing 2 and case 4 are fixed together by screws 70.

[0070] Case 4 is connected to the front of the motor housing section 21. The motor housing section 21 is fixed to the rear of case 4. A housing flange section 21F is provided at the front end of the motor housing section 21. A case flange section 4F, on which a plurality of boss sections 4H are formed, is provided at the rear end of case 4. The case 4 and the motor housing section 21 are fixed together when a screw 70 passes through a screw insertion hole in the housing flange section 21F and connects to the boss sections 4H.

[0071] Case 4 houses the bevel gear 35, which is a pinion gear. Case 4 houses the reduction gear 7. Case 4 houses the spindle 8. Case 4 houses the striking mechanism 9, which includes the hammer 47. Case 4 houses a portion of the anvil 10. Case 4 is made of metal. In this embodiment, case 4 is made of aluminum. Case 4 is hollow and box-shaped.

[0072] Case 4 includes a case body 4A and a lid 4B. The case body 4A is a hollow box shape with openings at the rear and top. The rear of the case body 4A is connected to the motor housing portion 21 of the housing 2 and is covered by the motor housing portion 21. The top of the case body 4A is covered by the lid 4B. The lid 4B is provided on the top surface of the case body 4A, extending from the front end to just before the rear end, and is fixed to the case body 4A by screws 4S. The case 4 houses the reduction gear portion 7, spindle 8, striking mechanism 9, and anvil 10, which are assembled through the top opening of the case body 4A, and the lid 4B is attached to the case body 4A to accommodate these components.

[0073] Case 4 has a front, left and right sides, and a bottom surface, which are formed by the case body 4A. As shown in Figure 7, the bottom surface of case 4 has a flat mounting surface 81 and a cylindrical portion 82 that protrudes downward from the mounting surface 81. The mounting surface 81 is a surface that is aligned in the front-rear direction and the left-right direction. The mounting surface 81 connects the front and left and right sides of the case body 4A to the cylindrical portion 82. The light unit 17 and the light cover 60 are placed on the mounting surface 81. The mounting surface 81 is covered by the light cover 60. The cylindrical portion 82 is located near the front of the bottom surface of case 4. The cylindrical portion 82 has a cylindrical shape. The internal opening of the cylindrical portion 82 communicates with the inside of case 4. The anvil 10 passes through the cylindrical portion 82. The anvil 10 protrudes downward from the inside of case 4 through the cylindrical portion 82.

[0074] Case 4 holds a bearing 38F that rotatably supports the rotor 27 of the motor 6. A reduction gear 7 is positioned in front of the bearing 38F. A spindle 8 and a striking mechanism 9 are positioned in front of the reduction gear 7. An anvil 10 is positioned below the striking mechanism 9.

[0075] Motor 6 is the power source for the angle fastening tool 1. Motor 6 generates rotational force. Motor 6 is an electric motor. Motor 6 is an inner rotor type brushless motor. Motor 6 is housed in the motor housing section 21 of the housing 2. Motor 6 is positioned inside the motor housing section 21.

[0076] As shown in Figure 5, the motor 6 has a stator 26 and a rotor 27 that is rotatable relative to the stator 26. The stator 26 is supported by the motor housing 21. At least a portion of the rotor 27 is positioned inside the stator 26. The rotor 27 rotates relative to the stator 26. The rotor 27 rotates around a rotation axis AX that extends in the front-rear direction.

[0077] The stator 26 includes a stator core 28, a front insulator 29, a rear insulator 30, and a coil 31.

[0078] The stator core 28 is positioned radially outward from the rotor 27. The stator core 28 includes multiple laminated steel plates. The steel plates are metal plates mainly composed of iron. The stator core 28 is cylindrical. The stator core 28 has multiple teeth that support the coil 31.

[0079] The front insulator 29 is provided at the front of the stator core 28. The rear insulator 30 is provided at the rear of the stator core 28. Both the front insulator 29 and the rear insulator 30 are electrically insulating members made of synthetic resin. The front insulator 29 is positioned to cover a portion of the surface of the teeth. The rear insulator 30 is positioned to cover a portion of the surface of the teeth.

[0080] The coil 31 is mounted on the stator core 28 via a front insulator 29 and a rear insulator 30. Multiple coils 31 are arranged. The coils 31 are arranged around the teeth of the stator core 28 via the front insulator 29 and the rear insulator 30. The coils 31 and the stator core 28 are electrically isolated by the front insulator 29 and the rear insulator 30.

[0081] The rotor 27 rotates around the rotation axis AX. The rotor 27 has a rotor core portion 32, a rotor shaft portion 33, and a rotor magnet 34.

[0082] The rotor core portion 32 and the rotor shaft portion 33 are each made of steel. In this embodiment, the rotor core portion 32 and the rotor shaft portion 33 are separate components. The rotor core portion 32 and the rotor shaft portion 33 may be integrally formed. The front portion of the rotor shaft portion 33 protrudes forward from the front end surface of the rotor core portion 32. The rear portion of the rotor shaft portion 33 protrudes rearward from the rear end surface of the rotor core portion 32.

[0083] The rotor magnet 34 is fixed to the rotor core 32. The rotor magnet 34 extends forward and backward so as to penetrate the rotor core 32.

[0084] A sensor board 37 is attached to the rear insulator 30. The sensor board 37 has an annular circuit board and a magnetic sensor supported by the circuit board. At least a portion of the sensor board 37 faces the rotor magnet 34. The magnetic sensor detects the rotational position of the rotor 27 by detecting the magnetic force of the rotor magnet 34.

[0085] Bearings (38F and 38R) are positioned on the front and rear sides of the rotor 27, respectively. The bearings (38F and 38R) rotatably support the rotor 27. The rear part of the rotor shaft portion 33 is rotatably supported by bearing 38R. The front part of the rotor shaft portion 33 is rotatably supported by bearing 38F. Bearing 38R is held in the housing 2. Bearing 38R is housed in a concave rear holding portion 21A provided in the motor housing portion 21. Bearing 38F is housed in a housing recess 85 provided in the rear of the case 4. The front end of the rotor shaft portion 33 is positioned in the internal space of the case 4 through the opening on the front of the motor housing portion 21 and the opening on the rear of the case 4.

[0086] A bevel gear 35 is provided at the front end of the rotor shaft portion 33. The bevel gear 35 is a pinion gear that rotates integrally with the rotor 27. The bevel gear 35 is connected to at least a part of the reduction mechanism portion 7. The rotor shaft portion 33 is connected to the reduction mechanism portion 7 via the bevel gear 35.

[0087] As shown in Figure 6, the reduction gear 7 is connected to a bevel gear 35, which is a pinion gear. The reduction gear 7 transmits the rotational force of the motor 6 to the spindle 8 and the anvil 10. The reduction gear 7 is housed in the case 4. The reduction gear 7 has multiple gears. The reduction gear 7 is positioned in front of the motor 6. The reduction gear 7 is positioned in front of the housing recess 85. The reduction gear 7 connects the rotor shaft 33 and the spindle 8. The gears of the reduction gear 7 are driven by the rotor 27. The reduction gear 7 transmits the rotation of the rotor 27 to the spindle 8. The reduction gear 7 rotates the spindle 8 at a rotational speed lower than the rotational speed of the rotor shaft 33.

[0088] The reduction gear mechanism 7 is composed of multiple reduction gears. The reduction gear mechanism 7 includes a first reduction gear 41 and a second reduction gear 42. The first reduction gear 41 is connected to a pinion gear and rotates by reducing the rotation of the pinion gear. The second reduction gear 42 reduces the rotation of the first reduction gear 41 and transmits it to the spindle 8.

[0089] The first reduction gear 41 includes a driven gear 41A, a first intermediate gear 41B, and a first intermediate shaft 41C. The first intermediate shaft 41C extends in a direction intersecting the rotation axis AX. The first intermediate shaft 41C extends along the vertical direction perpendicular to the rotation axis AX and rotates around a central axis in the vertical direction. Both ends of the first intermediate shaft 41C are rotatably supported by intermediate bearings 41D. The intermediate bearings 41D are held in the case 4. The intermediate bearings 41D are ball bearings. The driven gear 41A and the first intermediate gear 41B are fixed to the first intermediate shaft 41C. In this embodiment, the first intermediate gear 41B and the first intermediate shaft 41C are a single unit. The first intermediate gear 41B and the first intermediate shaft 41C may be separate units. The driven gear 41A is mounted on the lower part of the first intermediate shaft 41C, and the first intermediate gear 41B is mounted on the upper part of the first intermediate shaft 41C. The driven gear 41A, the first intermediate gear 41B, and the first intermediate shaft 41C rotate as a single unit. The driven gear 41A is a bevel gear that meshes with the pinion gear, the bevel gear 35. The first intermediate gear 41B is a spur gear. The first intermediate gear 41B meshes with the second intermediate gear 42A of the second reduction unit 42.

[0090] The second reduction gear 42 is positioned in front of the first reduction gear 41. The second reduction gear 42 has a second intermediate gear 42A and a second intermediate shaft 42B. The second intermediate shaft 42B extends in a direction intersecting the rotation axis AX. The second intermediate shaft 42B extends along the vertical direction perpendicular to the rotation axis AX and rotates around a central axis in the vertical direction. The first intermediate shaft 41C and the second intermediate shaft 42B are parallel. Both ends of the second intermediate shaft 42B are rotatably supported by intermediate bearings 42C. The intermediate bearings 42C are held in the case 4. The intermediate bearings 42C are sliding bearings. The second intermediate gear 42A is fixed to the second intermediate shaft 42B. The second intermediate gear 42A is mounted on the upper part of the second intermediate shaft 42B. The second intermediate gear 42A and the second intermediate shaft 42B rotate together. The second intermediate gear 42A is a spur gear. The second intermediate gear 42A meshes with the first intermediate gear 41B. The second intermediate gear 42A rotates by reducing the rotation speed of the first intermediate gear 41B. The second intermediate gear 42A meshes with the spindle gear 8C of the spindle 8. The spindle gear 8C rotates integrally with the spindle 8. The spindle gear 8C is a spur gear.

[0091] When the rotor shaft section 33 rotates due to the drive of the motor 6, the bevel gear 35 rotates, and the bevel gear 35 rotates the driven gear 41A. Due to the rotation of the driven gear 41A, the first intermediate shaft 41C rotates at a rotational speed lower than the rotational speed of the rotor shaft section 33. When the first intermediate shaft 41C rotates, the first intermediate gear 41B rotates, and the first intermediate gear 41B rotates the second intermediate gear 42A. Due to the rotation of the second intermediate gear 42A, the second intermediate gear 42A rotates at a rotational speed lower than the rotational speed of the first intermediate shaft 41C. The second intermediate gear 42A rotates the spindle gear 8C. The spindle gear 8C rotates at a rotational speed lower than the rotational speed of the second intermediate gear 42A. As the spindle gear 8C rotates, the spindle 8 rotates. The spindle 8 rotates at a lower rotational speed than the rotational speed of the rotor shaft 33.

[0092] The spindle 8 is connected to the reduction gear 7. The spindle 8 is rotated by the motor 6. The spindle 8 is positioned in front of the motor 6. The spindle 8 is positioned in front of the stator 26. The spindle 8 is positioned in front of the rotor 27. At least a portion of the spindle 8 is positioned in front of the reduction gear 7. The spindle 8 is rotated by the rotor 27. The spindle 8 rotates due to the rotational force of the rotor 27 transmitted by the reduction gear 7.

[0093] The spindle 8 extends in a direction intersecting the front-rear direction. The spindle 8 extends downward along the rotation axis BX which is perpendicular to the front-rear direction. The spindle 8 rotates around the rotation axis BX. The rotation axis BX of the spindle 8 and the rotation axis AX of the motor 6 are non-parallel and intersect each other. The direction of the rotation axis BX of the spindle 8 may intersect the front-rear direction (i.e., the rotation axis AX) at any angle between 80 degrees and 100 degrees. In this embodiment, the spindle 8, hammer 47 and anvil 10 are arranged along the rotation axis BX and rotate around the rotation axis BX.

[0094] The spindle 8 has a flange portion 8A and a spindle shaft portion 8B that protrudes downward from the flange portion 8A. The spindle gear 8C is provided on the outer circumference of the flange portion 8A.

[0095] The spindle 8 is rotatably supported by a spindle bearing 44. The spindle bearing 44 is held in the case 4. The spindle 8 has a cylindrical portion 8D that protrudes upward from the upper part of the flange portion 8A. The spindle bearing 44 is positioned on the outer circumference of the cylindrical portion 8D. The spindle bearing 44 rotatably supports the outer circumference of the cylindrical portion 8D. The spindle bearing 44 is a sliding bearing. The lower end of the spindle shaft portion 8B is provided with a cylindrical projection that protrudes downward. The projection is positioned in an anvil recess 10C formed on the upper surface of the anvil 10. The lower part of the spindle 8 is rotatably supported by an anvil bearing 46 via the anvil 10.

[0096] The striking mechanism 9 is driven by the motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via the reduction gear 7 and the spindle 8. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the rotational force of the spindle 8, which is rotated by the motor 6. As shown in Figures 6 and 7, the striking mechanism 9 has a hammer 47, a ball 48, and a coil spring 49. The striking mechanism 9, including the hammer 47, is housed in the case 4. The striking mechanism 9 is positioned between the spindle 8 and the anvil 10 in the case 4. The striking mechanism 9 is positioned below the flange portion 8A of the spindle 8.

[0097] The hammer 47 is positioned in front of the reduction gear 7. The hammer 47 is housed in the case 4. The hammer 47 is rotated by the spindle 8. The hammer 47 is positioned around the spindle shaft 8B. The hammer 47 is held by the spindle shaft 8B. The ball 48 is positioned between the spindle shaft 8B and the hammer 47. The coil spring 49 is supported by the flange 8A and the hammer 47, respectively.

[0098] The hammer 47 has a body portion 47D, a hammer groove 47A, and a hammer projection 47B (see Figure 7). The body portion 47D is arranged around the spindle shaft portion 8B. The body portion 47D is annular. A recess 47C is provided at the rear of the body portion 47D. The recess 47C is provided so as to recess forward from the rear end of the body portion 47D. The recess 47C is ring-shaped. The hammer projection 47B protrudes forward from the body portion 47D. Two hammer projections 47B are provided.

[0099] The hammer 47 is rotated by the motor 6. The rotational force of the motor 6 is transmitted to the hammer 47 via the reduction gear 7 and the spindle 8. The hammer 47 can rotate together with the spindle 8 based on the rotational force of the spindle 8, which is rotated by the motor 6. The axis of rotation of the hammer 47 and the axis of rotation BX of the spindle 8 coincide. The hammer 47 rotates around the axis of rotation BX. The hammer 47 moves relative to the spindle 8. The hammer 47 moves relative to the spindle 8 in the vertical direction.

[0100] The ball 48 is made of a metal such as steel. The ball 48 is positioned between the spindle shaft portion 8B and the hammer 47. The spindle 8 has a spindle groove 8F in which at least a portion of the ball 48 is positioned. The spindle groove 8F is provided on a portion of the outer circumferential surface of the spindle shaft portion 8B. The hammer 47 has a hammer groove 47A in which at least a portion of the ball 48 is positioned. The hammer groove 47A is provided on a portion of the inner surface of the body portion 47D. The ball 48 is positioned between the spindle groove 8F and the hammer groove 47A. The ball 48 can roll inside the spindle groove 8F and inside the hammer groove 47A, respectively. The hammer 47 is movable along with the ball 48. The spindle 8 and the hammer 47 can move relative to each other in the axial and rotational directions within the range of motion defined by the spindle groove 8F and the hammer groove 47A.

[0101] The coil spring 49 generates an elastic force that moves the hammer 47 downward. The coil spring 49 is positioned between the flange portion 8A and the hammer 47. The lower part of the coil spring 49 is positioned in a ring-shaped recess 47C provided on the rear surface of the hammer 47. A washer 45 is provided inside the recess 47C. The washer 45 is supported by the body portion 47D via a ball 50. The upper end of the coil spring 49 is supported by the flange portion 8A. The lower end of the coil spring 49 is supported by the washer 45. The hammer 47 and the coil spring 49 are able to rotate relative to each other around the rotation axis BX due to the interposition of the washer 45 and the ball 50.

[0102] The anvil 10 is the output section of the angle fastening tool 1. The anvil 10 rotates due to the rotational force of the motor 6. At least a portion of the anvil 10 is positioned below the hammer 47. The anvil 10 is struck directly or indirectly in the rotational direction by the hammer 47. In this embodiment, the anvil 10 is struck directly by the hammer 47.

[0103] The anvil 10 has a rod-shaped anvil shaft portion 10A and an anvil projection portion 10B. An anvil recess 10C is provided at the upper end of the anvil 10 to receive the projection portion of the spindle shaft portion 8B. The anvil projection portion 10B is provided at the upper end of the anvil 10. The anvil projection portion 10B protrudes radially outward from the upper end of the anvil shaft portion 10A. The anvil shaft portion 10A protrudes downward from the inside of the case 4, passing through the cylindrical portion 82, to the outside of the case 4. The lower end of the anvil shaft portion 10A is exposed to the outside of the case 4. A tip tool holder portion 51 is positioned at the lower end of the anvil 10. The tip tool holder portion 51 protrudes downward from the lower surface of the case 4. The tip tool holder portion 51 is provided on the exposed portion of the lower end of the anvil shaft portion 10A. The tip tool holder portion 51 is rotated by the spindle 8. The tip tool holder 51 is rotated by the spindle 8 via the hammer 47 and the anvil 10.

[0104] In the impact wrench according to this embodiment, the tip tool holder 51 is a rectangular prism-shaped engaging portion that engages with the engaging recess of the socket, which is the tip tool. The socket is held in a fitted state within the tip tool holder 51.

[0105] The anvil 10 is rotatably supported by an anvil bearing 46 (see Figure 7). The axis of rotation of the anvil 10 coincides with the axis of rotation BX of the spindle 8. The anvil 10 rotates around the axis of rotation BX. The anvil bearing 46 is located inside the cylindrical portion 82. The anvil bearing 46 is located inside the cylindrical portion 82 of the case 4. The anvil bearing 46 is held by the cylindrical portion 82. The cylindrical portion 82 is located around the anvil shaft portion 10A. The anvil bearing 46 rotatably supports the anvil shaft portion 10A. In this embodiment, the anvil bearing 46 is a sliding bearing. The anvil shaft portion 10A is provided with a ring-shaped groove 46A facing the anvil bearing 46. A ring-shaped sealing member 46B is located within the groove 46A. A washer 52 is also provided on the inner bottom surface of the case 4. The washer 52 faces the anvil projection 10B.

[0106] The hammer projection 47B is capable of contacting the anvil projection 10B. When the motor 6 is driven while the hammer projection 47B and the anvil projection 10B are in contact, the anvil 10 rotates together with the hammer 47 and the spindle 8.

[0107] The anvil 10 is struck in the rotational direction by the hammer 47. For example, in screw tightening work, if the load acting on the anvil 10 becomes high, there may be situations where the power generated by the motor 6 alone is insufficient to rotate the anvil 10. When the power generated by the motor 6 alone is insufficient to rotate the anvil 10, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 are relatively movable in the axial and circumferential directions, respectively, via the ball 48. Even if the rotation of the hammer 47 stops, the rotation of the spindle 8 continues due to the power generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 has stopped, the ball 48 moves upward, guided by the spindle groove 8F and the hammer groove 47A, respectively. The hammer 47 receives force from the ball 48 and moves upward along with the ball 48. In other words, the hammer 47 moves upward as the spindle 8 rotates while the rotation of the anvil 10 has stopped. As the hammer 47 moves upward, contact between the hammer projection 47B and the anvil projection 10B is released.

[0108] The coil spring 49 generates an elastic force that moves the hammer 47 downward. The hammer 47, having moved upward, moves downward due to the elastic force of the coil spring 49. As the hammer 47 moves downward, it receives a rotational force from the ball 48. That is, the hammer 47 moves downward while rotating. As the hammer 47 moves downward while rotating, the hammer projection 47B comes into contact with the anvil projection 10B while rotating. As a result, the anvil projection 10B is struck in the rotational direction by the hammer projection 47B. The anvil 10 is subjected to both the power of the motor 6 and the inertial force of the hammer 47. Therefore, the anvil 10 can rotate around the rotation axis BX with high torque.

[0109] The fan 12 rotates due to the rotational force of the motor 6. As shown in Figure 5, the fan 12 is positioned in front of the stator 26 of the motor 6. The fan 12 generates an airflow to cool the motor 6. The fan 12 is fixed to at least a portion of the rotor 27. The fan 12 is fixed to the front of the rotor shaft portion 33. The fan 12 is positioned between the bearing 38F and the stator 26. The fan 12 rotates with the rotation of the rotor 27. As the rotor shaft portion 33 rotates, the fan 12 rotates together with the rotor shaft portion 33. As the fan 12 rotates, air from the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 19. The air that flows into the internal space of the housing 2 cools the motor 6 by circulating through the internal space of the housing 2. As the fan 12 rotates, the air that has circulated through the internal space of the housing 2 flows out into the external space of the housing 2 through the exhaust port 20.

[0110] As shown in Figures 1 and 5, the control panel 16 is provided on the motor housing 21. The control panel 16 is exposed to the outside through a panel opening 21B formed on the upper surface of the motor housing 21. The control panel 16 is positioned near the boundary between the rear of the motor housing 21 and the grip portion 22. The control panel 16 is positioned in front of the trigger lever 14. At least a portion of the control panel 16 overlaps vertically with the motor 6. At least a portion of the control panel 16 overlaps vertically with the bearing 38R.

[0111] Figure 8 is a perspective view showing the operation panel 16 according to the embodiment. In Figure 8, the right side part of the housing 2 has been removed, exposing a part of the operation panel 16. The operation panel 16 is plate-shaped. The operation panel 16 has an operation button 16A, an indicator display 16B, and a switch board 16C. The switch plate 16D fits into the panel opening 21B. The switch board 16C has a flat plate shape. A switch is provided on the switch board 16C. The switch is, for example, an operation button 16A, but it may also be a DIP switch, rocker switch, rotary switch, or something other than a button. Specifically, the switch board 16C is a circuit board on which the operation button 16A and the indicator display 16B are provided. The switch board 16C is connected to the controller 18 by wiring. The motor housing portion 21 is provided with a retaining groove 21C that supports the outer circumference of the switch board 16C at a position directly below the panel opening 21B. The control panel 16 is held in the motor housing 21 by the outer circumference of the switch board 16C fitting into the retaining groove 21C. The switch board 16C is positioned on the upper part of the motor housing 21 and runs along the upper surface of the motor housing 21. The control panel 16 outputs a signal to the controller 18 in response to the input of the operation button 16A, and displays information on the indicator display 16B in response to the signal from the controller 18.

[0112] When the operator operates the operation button 16A, the controller 18 switches the operating mode of the motor 6. The indicator display 16B has a light-emitting element. The light-emitting element is, for example, an LED light-emitting element. The indicator display 16B displays the operating mode of the motor 6 by changing the lighting pattern of multiple light-emitting elements. The operating modes include, for example, three different operating modes for high, medium, and low speed settings of the motor 6, a mode in which the motor 6 is stopped based on the detection that striking by the striking mechanism 9 has started, and a mode in which the motor 6 is stopped or switched to low speed rotation based on the detection of the rotation of the nut when loosening the nut.

[0113] Figure 9 is a schematic diagram showing the mounting of the battery 25 to the battery holding section 23 according to the embodiment. In Figure 9, the right side part of the housing 2 is removed, exposing the inside of the battery holding section 23. As shown in Figures 4 and 9, the battery mounting section 13 is located below the battery holding section 23. The battery 25 is mounted in the battery mounting section 13. The battery 25 is detachable from the battery mounting section 13. The battery mounting section 13 holds the battery 25 so that it can slide in the front-rear direction. When the battery 25 slides from the rear to the front of the battery mounting section 13 and reaches the engagement position, the battery mounting section 13 engages with the engagement hook 25A of the battery 25, restricting the rearward sliding movement of the battery 25. The battery 25 is provided with a release button that moves the engagement hook 25A up and down. When the release button is pressed, the engagement hook 25A retracts downward, releasing the engagement with the battery mounting section 13. This makes it possible to attach and detach the battery 25.

[0114] The battery 25 functions as a power source for the angle fastening tool 1. The battery 25 includes a secondary battery. In an embodiment, the battery 25 includes a rechargeable lithium-ion battery. By being mounted in the battery mounting section 13, the battery 25 can supply power to the angle fastening tool 1. The motor 6 and the light unit 17 are each driven based on the power supplied from the battery 25.

[0115] The controller 18 operates based on power supplied from the battery 25. The controller 18 is connected to the motor 6, switch board 16C, and trigger lever 14 via wiring. The controller 18 is connected to the battery 25 via wiring. The wiring passes inside the grip section 22.

[0116] The controller 18 outputs control signals to control the motor 6. The controller 18 includes a circuit board on which multiple electronic components are mounted. Examples of electronic components mounted on the circuit board include a processor such as a CPU (Central Processing Unit), non-volatile memory such as ROM (Read Only Memory) or storage, volatile memory such as RAM (Random Access Memory), a field-effect transistor (FET), and a resistor. The controller 18 sets the operating mode of the angle fastening tool 1 based on the operation of the operation panel 16. The setting parameters for the operating mode of the angle fastening tool 1 include the current threshold and on / off control conditions of the motor 6. The controller 18 outputs a signal to the operation panel 16 to display the setting status of the operating mode.

[0117] The controller 18 is positioned behind the switch board 16C. The controller 18 is positioned behind the trigger lever 14. The controller 18 is positioned in the battery holding section 23. The controller 18 is positioned above the battery mounting section 13. The controller 18 is oriented in the front-to-back and left-to-right directions. The controller 18 is positioned so as to overlap the upper surface of the battery mounting section 13. The battery holding section 23 has a dome-shaped outer shape in which a space for housing the controller 18 is formed.

[0118] As shown in Figure 4, the trigger lever 14 is provided on the grip portion 22. The trigger lever 14 is provided on the front of the grip portion 22. The trigger lever 14 is provided so as to protrude downward from the lower surface of the grip portion 22. The trigger lever 14 is operated by the operator to start the motor 6. A switch body 14A is positioned above the trigger lever 14. The switch body 14A is positioned inside the grip portion 22. When the trigger lever 14 is operated, the switch body 14A is operated. When the switch body 14A is operated, a trigger signal is generated. The controller 18 switches between driving and stopping the motor 6 based on the trigger signal.

[0119] As shown in Figure 2, in the vertical direction, the lower end 14B of the trigger lever 14 is positioned above the lower end of the tool holder 51. The lower end 14B of the trigger lever 14 is positioned above the lower surface of the battery 25. In the vertical direction, the lower end 14B of the trigger lever 14 is positioned between the lower end of the tool holder 51 and the lower surface 21P of the motor housing 21. In the vertical direction, the lower end 14B of the trigger lever 14 is positioned closer to the lower surface 21P of the motor housing 21 than to the lower end of the tool holder 51. In other words, the vertical distance from the lower end 14B of the trigger lever 14 to the lower surface 21P of the motor housing 21 is smaller than the vertical distance from the lower end 14B of the trigger lever 14 to the lower end of the tool holder 51. The lower end 14B of the trigger lever 14 may be positioned above the lower surface 21P of the motor housing 21.

[0120] The forward / reverse rotation switching lever 15 is provided on the grip portion 22. The forward / reverse rotation switching lever 15 is positioned above the trigger lever 14 on the left and right sides of the grip portion 22. The forward / reverse rotation switching lever 15 is operated by the operator. When the forward / reverse rotation switching lever 15 is operated, the rotation direction of the motor 6 is switched from one direction to the other. When the rotation direction of the motor 6 is switched, the rotation direction of the spindle 8 is switched.

[0121] The light unit 17 emits illumination light. The light unit 17 illuminates the anvil 10 and its surroundings with illumination light. The light unit 17 includes one or more light-emitting elements 53. The light unit 17 includes chip-on-board light-emitting diodes (COB LEDs).

[0122] In the first embodiment, the trigger lever 14 located at the front end of the grip portion 22, the switch board 16C, and the motor 6 are brought closer to each other in the front-rear direction. As a result, the grip portion 22, including the trigger lever 14, is brought closer to the motor 6, which is one of the heavy components of the angle fastening tool 1.

[0123] As shown in Figure 4, the angle fastening tool 1 has the motor 6, switch board 16C (operation panel 16), trigger lever 14, and controller 18 arranged in that order from front to rear. The front-to-back distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-to-back distance L2 between the trigger lever 14 and the controller 18. As shown in Figure 5, the front-to-back distance L3 between the trigger lever 14 and the rear bearing 38R is smaller than the front-to-back length L10 of the switch board 16C.

[0124] As shown in Figure 5, the switch board 16C is positioned in front of the trigger lever 14, overlapping with the motor 6 in the vertical direction. Overlapping in the vertical direction means that when two or more objects are viewed from above, they have overlapping portions. The fact that the switch board 16C overlaps with the motor 6 in the vertical direction can be rephrased as at least a part of the switch board 16C and at least a part of the motor 6 being positioned at the same location in the front-to-back direction. The front end 16F of the switch board 16C overlaps with the rear of the motor 6 in the vertical direction. The front end 16F of the switch board 16C is positioned at the same location as the rear of the motor 6 in the front-to-back direction, and is offset from the motor 6 in the vertical direction.

[0125] The front end 16F of the switch board 16C is positioned in front of the rear bearing 38R. The front end 16F of the switch board 16C is positioned in front of the rear end of the motor 6. The switch board 16C overlaps both the stator 26 and the rotor 27 in the vertical direction. In other words, the front end 16F of the switch board 16C is positioned in front of the rear surface of the stator core 28 and in front of the rear surface of the rotor core 32.

[0126] The rear end 16R of the switch board 16C overlaps with the front of the trigger lever 14 in the vertical direction. The rear end 16R of the switch board 16C is positioned at the same position in the front-to-back direction as the front of the trigger lever 14, and is offset vertically from the trigger lever 14. The rear end 16R of the switch board 16C is located behind the front of the trigger lever 14. The rear end 16R of the switch board 16C is located behind the bearing 38R.

[0127] (Light unit) Figure 10 is a longitudinal cross-sectional view along the front-to-back direction showing the light unit 17 according to the embodiment. Figure 11 is an exploded perspective view showing the structure of the light unit 17 according to the embodiment. Figure 12 is a perspective view from below showing the front of the angle fastening tool 1 according to the embodiment. Figure 13 is an exploded perspective view from below showing the mounting of the light cover to the case according to the embodiment. Figure 14 is a perspective view from below showing the case according to the embodiment. Figure 15 is a bottom view of the case with the light cover removed. Figure 16 is a perspective view showing the light cover.

[0128] The light unit 17 is positioned on the lower surface of the case 4. The light unit 17 is positioned around the cylindrical portion 82. The light unit 17 is positioned around the anvil 10 via the cylindrical portion 82. In this embodiment, the light unit 17 has an annular shape that surrounds the anvil 10.

[0129] The light unit 17 includes a plurality of light-emitting elements 53. The light-emitting elements 53 are LED (light-emitting diodes) elements. The light unit 17 has a substrate 54 on which the plurality of light-emitting elements 53 are provided.

[0130] The light-emitting element 53 is held in the case 4. The light-emitting element 53 is held on the lower surface of the case 4. Multiple light-emitting elements 53 are provided around the anvil 10. Multiple light-emitting elements 53 are arranged along the circumferential direction of the anvil 10. Multiple light-emitting elements 53 are arranged in the rotational direction around the anvil 10. The light-emitting elements 53 are arranged around at least a portion of the anvil shaft portion 10A. Multiple light-emitting elements 53 are aligned along the rotational direction of the anvil 10. The light-emitting elements 53 are mounted on the lower surface of the substrate 54.

[0131] Examples of substrates 54 include aluminum substrates, glass cloth-based epoxy resin substrates (FR-4 substrates), and composite-based epoxy resin substrates (CEM-3 substrates). The light-emitting elements 53 are mounted on the surface of the substrate 54. The light-emitting elements 53 and the substrate 54 are connected via gold wires (not shown). The gold wires connect multiple light-emitting elements 53 to each other. The multiple light-emitting elements 53 are surrounded by a bank 55. A phosphor 56 is placed within the compartmentalized space surrounded by the bank 55. The light-emitting elements 53 are covered by the phosphor 56. A pair of electrodes (not shown) are placed on the front or back surface of the substrate 54 outside the bank. One electrode of the pair is the positive electrode, and the other electrode is the negative electrode. Lead wires 65 are connected to each of the pair of electrodes. Power output from the battery 25 is supplied to the electrodes via the lead wires 65. The power supplied to the electrodes is supplied to the light-emitting elements 53 via the substrate 54 and the gold wires. The light-emitting element 53 emits light based on power supplied from the battery 25. The light unit 17 and the controller 18 are connected via lead wires 65.

[0132] The substrate 54 has an annular shape that surrounds the cylindrical portion 82. Multiple light-emitting elements 53 are arranged at intervals around the substrate 54 in the circumferential direction. The number of light-emitting elements 53 is not limited as long as there are multiple elements. In this embodiment, 12 light-emitting elements 53 are arranged at equal intervals around the circumferential direction of the cylindrical portion 82 (see Figure 11).

[0133] The light unit 17 has an optical element 57.

[0134] The optical element 57 is connected to the light unit 17. The optical element 57 is made of polycarbonate resin. In this embodiment, the optical element 57 is made of polycarbonate resin containing a white diffusing material. The optical element 57 is milky white. The optical element 57 transmits at least a portion of the light emitted from the light unit 17. The light transmittance of the optical element 57 is, for example, 40% to 70%. The optical element 57 diffuses the light from the multiple light emitters 53.

[0135] The optical member 57 is positioned to cover the front of the multiple light-emitting elements 53. At least a portion of the optical member 57 is positioned in front of the light unit 17. The optical member 57 is continuous, spanning across the multiple light-emitting elements 53. The optical member 57 is formed in an annular shape that surrounds the anvil 10 so as to cover the multiple light-emitting elements 53. The optical member 57 is annular. The optical member 57 has an outer cylindrical portion 57A, an inner cylindrical portion 57B, a light-transmitting portion 57C, and a convex portion 57D.

[0136] As shown in Figure 10, the outer cylinder portion 57A is positioned radially outward from the inner cylinder portion 57B. In the radial direction, the multiple light-emitting elements 53 are positioned between the outer cylinder portion 57A and the inner cylinder portion 57B. The inner cylinder portion 57B is positioned radially outward from the cylindrical portion 82 of the case 4. The light-transmitting portion 57C is positioned below the multiple light-emitting elements 53. The light-transmitting portion 57C is annular in shape. The light-transmitting portion 57C is positioned to connect the front end of the outer cylinder portion 57A and the front end of the inner cylinder portion 57B. The light-transmitting portion 57C faces the lower surface of the substrate 54. The light-transmitting portion 57C faces the light-emitting elements 53. Light emitted from the light-emitting elements 53 passes through the light-transmitting portion 57C and is irradiated downward from the light unit 17. The lower surface of the light-transmitting portion 57C constitutes the light-emitting surface of the light unit 17.

[0137] The protrusion 57D is positioned behind the light-transmitting portion 57C. The protrusion 57D is provided so as to project backward from the rear of the outer cylinder portion 57A. By being positioned between the pair of guide protrusions 83 of the case 4 (see Figures 14 and 15), the protrusion 57D functions as a positioning portion for the light unit 17 in the rotational direction.

[0138] As shown in Figure 10, the upper surface of the substrate 54 is positioned below the upper end of the outer cylinder portion 57A and the upper end of the inner cylinder portion 57B. The substrate 54 and the multiple light-emitting elements 53 are placed in a concave housing space formed by the outer cylinder portion 57A, the inner cylinder portion 57B, and the light-transmitting portion 57C of the optical member 57. The upper surface of the housing space is open. Molding resin 58 is filled into the housing space. The molding resin 58 fixes the multiple light-emitting elements 53, the substrate 54, the optical member 57, and a portion of the lead wire 65 to each other.

[0139] Case 4 holds the light unit 17. The light unit 17, which includes multiple light-emitting elements 53, is held on the underside of case 4. The angle fastening tool 1 is positioned on the underside of case 4 and includes a light cover 60 that holds the light-emitting elements 53 and covers the lead wires 65.

[0140] (Light cover) As shown in Figures 12 and 13, the light cover 60 is separate from the motor housing 21. The light cover 60 is separate from the case 4. The light cover 60 engages with the motor housing 21. The light cover 60 is mounted on the lower surface of the case 4. The light cover 60 holds the light unit 17 on the lower surface of the case 4. The light unit 17 is held between the lower surface of the case 4 and the light cover 60. The light cover 60 is made of, for example, resin.

[0141] The light cover 60 includes a light-emitting element holding portion 61 and a cover portion 62. The light cover 60 is a single component in which the light-emitting element holding portion 61 and the cover portion 62 are integrally formed. The light-emitting element holding portion 61 is separate from the motor housing portion 21. The cover portion 62 is separate from the motor housing portion 21. The light-emitting element holding portion 61 is separate from the case 4. The cover portion 62 is separate from the case 4.

[0142] The light-emitting element holder 61 is positioned on the lower surface of the case 4 and holds a plurality of light-emitting elements 53. The light-emitting elements 53 and the light-emitting element holder 61 are positioned on the mounting surface 81. The light-emitting element holder 61 is provided circumferentially along the outer circumference of the optical member 57. The light-emitting element holder 61 is ring-shaped and surrounds the outer circumference of the optical member 57. The light-emitting element holder 61 has a peripheral wall portion 61A that surrounds the periphery of the optical member 57. The peripheral wall portion 61A is ring-shaped. The peripheral wall portion 61A extends vertically from the mounting surface 81 of the case 4 to the lower surface of the optical member 57. The light-emitting element holder 61 has a locking portion 61B that protrudes radially inward from the lower end of the peripheral wall portion 61A. The locking portion 61B is provided along the entire inner circumference of the peripheral wall portion 61A. The locking portion 61B is located below the lower surface of the optical member 57. The locking portion 61B contacts the lower surface of the optical member 57 from below. The locking portion 61B makes localized contact with the outer peripheral edge of the lower surface of the optical member 57 by catching on it. The locking portion 61B is located on the lower surface of the optical member 57, on the outer peripheral side of the light-emitting body 53. The light-emitting body holding portion 61 supports the lower surface of the optical member 57 at the locking portion 61B. As described above, the light unit 17, including the optical member 57, the light-emitting body 53, and the substrate 54, is integrated by the molded resin 58, so the light-emitting body holding portion 61 supports the entire light unit 17, including the light-emitting body 53, from below by supporting the lower surface of the optical member 57. The light-emitting body holding portion 61 exposes the lower surface of the optical member 57 at a position directly below the light-emitting body 53 and at a position on the inner peripheral side of the light-emitting body 53.

[0143] The light-emitting element holder 61 is fixed to the lower surface of the case 4 by a screw 60S, which tightens the light-emitting element holder 61 toward the lower surface of the case 4. The light-emitting element holder 61 holds multiple light-emitting elements 53 by pressing the lower surface of the optical member 57 toward the case 4 with the locking portion 61B. The light-emitting element holder 61 presses the outer peripheral edge of the lower surface of the optical member 57.

[0144] The light-emitting element holder 61 is fixed to the lower surface of the case 4 by screws 60S at multiple locations around the optical element 57. The light-emitting element holder 61 is fixed to the lower surface of the case 4 by four screws 60S at the four corners. Screw holes 81A are formed in the flat mounting surface 81 of the lower surface of the case 4. The screw holes 81A are located at the four corners surrounding the cylindrical part 82. In other words, the four screw holes 81A are arranged at approximately 90-degree intervals in the rotational direction of the cylindrical part 82. The peripheral wall 61A has boss portions 61H to which the screws 60S are attached. The boss portions 61H are located at the four corners surrounding the cylindrical part 82, corresponding to the screw holes 81A on the mounting surface 81. The boss portions 61H have through holes for the screws 60S to pass through. The screws 60S pass through the through holes in the boss portions 61H from below and are fixed to the screw holes 81A. The axial force of the screw 60S causes the light-emitting element holder 61 to press the optical element 57 upward toward the mounting surface 81 from the four corners around the optical element 57.

[0145] As shown in Figure 10, the angle fastening tool 1 further comprises a buffer member 59 positioned between the light-emitting element 53 and the lower surface of the case 4, the buffer member 59 positioned above the light unit 17. The buffer member 59 is an elastic material, for example, made of rubber. The buffer member 59 protects the substrate 54 and optical element 57 from contact with the case 4, which is a metal vibrator. The buffer member 59 covers at least a portion of the upper surface of the light unit 17. Due to the interposition of the buffer member 59, the light unit 17 is held between the mounting surface 81 and the light-emitting element holding part 61, away from the mounting surface 81 of the case 4.

[0146] The cushioning member 59 is ring-shaped. The cushioning member 59 overlaps the light unit 17 around its entire circumference. The cushioning member 59 is held in an elastically deformed state by being sandwiched between the light unit 17 and the mounting surface 81. The cushioning member 59 is crushed by the light unit 17 due to the axial force of the screw 60S. The cushioning member 59 deforms to match the shape of the upper surface of the light unit 17 so as to fill the gap between the light unit 17 and the mounting surface 81. The upper surface of the cushioning member 59 contacts the mounting surface 81 and the cylindrical portion 82. The lower surface of the cushioning member 59 contacts the light unit 17.

[0147] As shown in Figures 12 and 13, the cover portion 62 covers the lead wire 65. The lead wire 65 extends from the motor housing portion 21. The lead wire 65 is connected to multiple light-emitting elements 53. In other words, the lead wire 65 extends from the light unit 17 to the motor housing portion 21 along the bottom surface of the case 4. The lead wire 65 connects the multiple light-emitting elements 53 to the controller 18. The lead wire 65 (see Figure 4) extends from the controller 18, through the battery holder portion 23 and the inside of the motor housing portion 21, and extends to the bottom surface of the case 4 from the lower opening 21D on the front of the motor housing portion 21. The lead wire 65 extends forward along the bottom surface of the case 4 and connects to the circuit board 54 of the light unit 17. As a result, the lead wire 65 connects to the multiple light-emitting elements 53 on the circuit board 54 and supplies power.

[0148] As shown in Figure 15, the lead wire 65 includes a first lead wire 65A extending from the motor housing 21 and a second lead wire 65B connected to the first lead wire 65A via a connector 66 and connected to a plurality of light-emitting elements 53. The first lead wire 65A extends forward from inside the motor housing 21 through the lower opening 21D of the motor housing 21 to the bottom surface of the case 4. The first lead wire 65A is provided with a connector 66A on one side. The second lead wire 65B extends rearward from the circuit board 54 of the light unit 17 along the bottom surface of the case 4. The second lead wire 65B is provided with a connector 66B on the other side. By connecting the connector 66A of the first lead wire 65A and the connector 66B of the second lead wire 65B, the first lead wire 65A and the second lead wire 65B become electrically connected. Connectors 66A and 66B are detachable by insertion and removal. When connector 66B is separated from connector 66A, the subassembly consisting of the light unit 17, the second lead wire 65B, and connector 66B can be separated from the angle fastening tool 1.

[0149] As shown in Figures 14 and 15, the case 4 has a groove 84 on its lower surface for arranging the lead wires 65. The groove 84 is a concave portion that is recessed upward from the lower surface of the case 4. The groove 84 is provided on the lower surface of the case 4, along the front-rear direction, from the rear end of the mounting surface 81 to the rear end of the case 4. The first lead wire 65A and the second lead wire 65B are arranged in the groove 84. The connector 66A of the first lead wire 65A and the connector 66B of the second lead wire 65B are connected in the groove 84.

[0150] The angle fastening tool 1 includes an earth wire 67 that extends from the motor housing 21 and connects to the lower surface of the case 4. The earth wire 67 is connected to a grounding terminal 84B provided on the lower surface of the case 4. The grounding terminal 84B is located in a groove 84. The earth wire 67 is connected to the grounding terminal 84B from the lower opening 21D of the motor housing 21, through the groove 84. The lead wire 65 and the earth wire 67 are located in the same groove 84.

[0151] The groove 84 has a narrow passage 84A at its rear end. The passage 84A extends to the rear surface of the case 4. The lead wires 65 and ground wires 67 extending from the lower opening 21D (see Figure 13) of the motor housing 21 pass through the passage 84A. The passage 84A allows the starting positions of the lead wires 65 and ground wires 67 on the lower surface of the case 4 to be determined by the position of the passage 84A, and also allows multiple wires to be bundled together.

[0152] The cover portion 62 covers the lead wire 65 and the ground wire 67. The cover portion 62 covers the groove portion 84 in which the lead wire 65 is located. The cover portion 62 covers the ground wire 67 and the grounding terminal 84B. On the lower surface of the case 4, the cover portion 62 extends from the position where the multiple light-emitting elements 53 are located to the motor housing portion 21. Specifically, the cover portion 62 extends rearward from the rear end of the light-emitting element holding portion 61. The cover portion 62 extends to the front surface of the motor housing portion 21. The cover portion 62 covers the entire groove portion 84.

[0153] As shown in Figure 16, the cover portion 62 has a cover recess 63 that is recessed downward from the top surface, in contrast to the groove portion 84. Between the bottom surface of the case 4 and the cover portion 62, a wiring accommodation space is formed, which is composed of the groove portion 84 and the cover recess 63.

[0154] The cover portion 62 has a claw portion 62A that engages with the motor housing portion 21. The claw portion 62A is located at the rear end of the cover portion 62. The claw portion 62A protrudes rearward from the rear end of the cover portion 62. The claw portion 62A engages with the motor housing portion 21 (see Figure 13) by being inserted into the lower opening 21D of the motor housing portion 21. The rear end of the cover portion 62 is movable in the front-rear direction but not downward due to the engagement between the motor housing portion 21 and the claw portion 62A. The cover portion 62 is fixed to the case 4 with the claw portion 62A engaged with the motor housing portion 21. The cover portion 62 covers the entire lower opening 21D of the motor housing portion 21.

[0155] As shown in Figures 12 and 13, the light cover 60, including the light-emitting element holder 61 and the cover portion 62, covers substantially the entire lower surface of the case 4. When assembling the angle fastening tool 1, the assembler places the light unit 17 on the mounting surface 81 via the cushioning member 59, connects the connector 66A and the connector 66B, and then attaches the light cover 60 to the case 4. The light cover 60 is fixed to the case 4 by screws 60S with four boss portions 61H, with the claw portion 62A inserted into and engaged with the lower opening 21D of the motor housing portion 21. When replacing the light unit 17 for maintenance, the light cover 60 can be removed from the case 4 in the reverse order, and then the light assembly consisting of the light unit 17, the second lead wire 65B, and the connector 66B can be removed from the angle fastening tool 1 simply by separating the connector 66A and the connector 66B.

[0156] (Structure of the control panel and the structure of the control panel) Figure 17 is a bottom perspective view showing the operation panel 16 in the separated state of housing 2. Figure 18 is a perspective view of the housing showing the holding structure of the operation panel 16. Figure 19 is a side view of the first housing 2L showing the holding structure of the operation panel 16. Figure 20 is a side view of the second housing 2R showing the holding structure of the operation panel 16. Figure 21 is a horizontal cross-sectional view of the housing showing the holding structure of the operation panel 16. Figure 22 is a cross-sectional view of the housing along the left-right direction showing the holding structure of the operation panel 16.

[0157] The operation panel 16 according to this embodiment is held in the housing 2. As shown in Figures 17 and 18, the housing 2 has a panel opening 21B in which the switch plate 16D is placed, and a retaining groove 21C formed on the inner surface of the housing 2. The switch substrate 16C is held in the housing 2 by a portion of the switch substrate 16C being inserted into the retaining groove 21C.

[0158] Specifically, as shown in Figures 21 and 22, the housing 2 is constructed by connecting a first housing 2L, which includes a panel opening 21B and a first portion PS1 of the retaining groove 21C, and a second housing 2R, which includes a panel opening 21B and a second portion PS2 of the retaining groove 21C. The first housing 2L and the second housing 2R are a pair of left and right split housings. In one example, the first housing 2L is the left housing that constitutes the left portion of the housing 2, and the second housing 2R is the right housing that constitutes the right portion of the housing 2. Alternatively, the first housing 2L may be the right housing and the second housing 2R may be the left housing. The first housing 2L and the second housing 2R have mating surfaces FS that face each other. The first housing 2L and the second housing 2R are connected to each other by screws 2S (see Figure 1) with their mating surfaces FS in contact with each other. The first housing 2L and the second housing 2R are connected to each other with the operation panel 16 sandwiched between them from the left and right.

[0159] As shown in Figures 19 and 21, the first portion PS1 of the panel opening 21B and retaining groove 21C formed in the first housing 2L constitutes the left half of the panel opening 21B and the left half of the retaining groove 21C. The left half of the operation panel 16 is positioned in the first portion PS1. The left portion of the switch plate 16D and operation button 16A is positioned in the first portion PS1 of the panel opening 21B. The left portion of the switch board 16C is positioned in the first portion PS1 of the retaining groove 21C.

[0160] As shown in Figures 20 and 21, the second portion PS2 of the panel opening 21B and retaining groove 21C formed in the second housing 2R constitutes the right half of the panel opening 21B and the right half of the retaining groove 21C. The right half of the operation panel 16 is positioned in the second portion PS2. The right portion of the switch plate 16D and operation button 16A is positioned in the second portion PS2 of the panel opening 21B. The right portion of the switch board 16C is positioned in the second portion PS2 of the retaining groove 21C.

[0161] As shown in Figures 17 to 20, the retaining groove 21C is provided on at least one of the two ends (front end) and rear end (rear end) of the switch substrate 16C at the mating surface FS of the first housing 2L and the second housing 2R. In this embodiment, the retaining groove 21C is provided on both the front end and rear end (rear end) of the switch substrate 16C. Therefore, the retaining groove 21C supports the front and rear of the switch substrate 16C at both ends. In other words, the retaining groove 21C accommodates and holds the front edge portion of the switch substrate 16C, which is the front end portion and extends in the left-right direction. The retaining groove 21C also accommodates and holds the rear edge portion of the switch substrate 16C, which is the rear end portion and extends in the left-right direction. As a result, the retaining groove 21C prevents the switch substrate 16C from being displaced in the vertical direction. The retaining groove 21C has the function of preventing the operation panel 16 from coming off upward and the function of supporting the downward external force acting on the operation panel 16 when it is operated. The retaining groove 21C may be provided only on one end (front end) of the switch board 16C, or only on the other end (rear end) of the switch board 16C.

[0162] As shown in Figures 18 and 21, the retaining groove 21C extends in a first direction A perpendicular to the mating surface FS. In this embodiment, the first housing 2L and the second housing 2R are left and right half-housings, and the mating surface FS is a surface that aligns with the front-rear and up-down directions, so the first direction A is the left-right direction. The first portion PS1 of the retaining groove 21C in the first housing 2L extends to the left from the mating surface FS of the first housing 2L. The second portion PS2 of the retaining groove 21C in the second housing 2R extends to the right from the mating surface FS of the second housing 2R.

[0163] When assembling the control panel 16, first, the left half of the control panel 16 is inserted into the first part PS1 on the first housing 2L side from the mating surface FS to the left. The left portion of the switch board 16C is inserted into the first part PS1 of the retaining groove 21C on the first housing 2L side. The right half of the control panel 16 protrudes to the right from the mating surface FS of the first housing 2L. Next, the mating surface FS of the second housing 2R is aligned and brought into contact with the mating surface FS of the first housing 2L from the right side. At this time, the right portion of the switch board 16C is inserted into the second part PS2 of the retaining groove 21C on the second housing 2R side. As a result, the left and right sides of the switch board 16C are inserted into the first part PS1 and the second part PS2 of the retaining groove 21C, respectively.

[0164] During assembly, the worker can insert the switch board 16C into the retaining groove 21C while visually inspecting the mating surface FS of the first housing 2L (the first portion PS1 of the retaining groove 21C). On the other hand, when inserting the right side of the switch board 16C, the position of the retaining groove 21C (second portion PS2) of the second housing 2R is difficult to see. Therefore, in this embodiment, the retaining groove 21C (second portion PS2) on the second housing 2R side has a structure that makes it easier to insert the switch board 16C than the retaining groove 21C (first portion PS1) on the first housing 2L side.

[0165] Specifically, as shown in Figure 21, the first portion PS1 of the retaining groove 21C has a first clearance CL1 between it and the switch substrate 16C in a second direction B that connects one end and the other end of the switch substrate 16C in a cross-section along the mating surface FS. In this embodiment, the second direction B is the front-to-back direction. The second portion PS2 of the retaining groove 21C has a second clearance CL2 between it and the switch substrate 16C that is larger than the first clearance CL1 in the second direction B. By increasing the second clearance CL2 for the second portion PS2, which is difficult to visually confirm relative to the switch substrate 16C during assembly, the insertion of the switch substrate 16C can be easily performed.

[0166] The front-to-back and left-to-right positioning of the control panel 16 relative to the housing 2 is achieved by fitting the switch plate 16D with the panel opening 21B. Both the first clearance CL1 and the second clearance CL2 are larger than the front-to-back gap between the switch plate 16D and the panel opening 21B. Therefore, during assembly, if the second portion PS2 of the panel opening 21B on the second housing 2R side is fitted into the right half of the switch plate 16D, the right portion of the switch board 16C can also be naturally inserted into the second portion PS2 of the retaining groove 21C.

[0167] In the embodiment, the housing 2 further has a structure that supports the downward external force when the switch SW (operation button 16A) of the operation panel 16 is pressed, in addition to the retaining groove 21C. That is, as shown in Figures 18, 21 and 22, at least one of the first housing 2L and the second housing 2R has a support surface 151 that supports the switch substrate 16C at a position adjacent to the switch substrate 16C on the opposite side (i.e., the lower side) from the panel opening 21B. In the embodiment, both the first housing 2L and the second housing 2R have the support surface 151.

[0168] The support surface 151 is provided at a position that contacts the edge of the switch board 16C in the first direction A. In this embodiment, the first direction A coincides with the left-right direction, so the support surface 151 supports the left-right edge of the switch board 16C. In other words, the support surface 151 of the first housing 2L supports the lower surface of the left edge of the switch board 16C, which is the left end and extends in the front-rear direction. The support surface 151 of the second housing 2R supports the lower surface of the right edge of the switch board 16C, which is the right end and extends in the front-rear direction.

[0169] Each support surface 151 extends in a second direction B (front-to-back direction) along the edges (left edge and right edge) of the switch substrate 16C. The end of each support surface 151 in the second direction B is connected to the retaining groove 21C. Thus, the outer circumference of the switch substrate 16C is supported by the retaining groove 21C extending in a first direction A (left-to-right direction) along the front and rear edges of the switch substrate 16C, and by the support surfaces 151 extending in a second direction B (front-to-back direction) along the left and right edges of the switch substrate 16C.

[0170] The support surface 151 is provided on the front and rear of the switch board 16C in the second direction B (front-to-back direction). In this embodiment, the engagement claws (first engagement claw 166, second engagement claw 167) of the switch plate 16D, described later, are positioned at the front-to-back center of the left and right edges of the switch board 16C. Therefore, the support surface 151 supports the front and rear portions excluding the positions of the engagement claws. In other words, the support surface 151 has a notch in the center of the second direction B through which the engagement claws pass.

[0171] As shown in Figure 19, the retaining groove 21C has a protrusion 152 that projects toward the surface of the switch substrate 16C on which the switch SW is mounted. The protrusion 152 is formed on the upper surface of the retaining groove 21C relative to the switch substrate 16C and protrudes downward. Therefore, the protrusion 152 faces the upper surface of the switch substrate 16C in the vertical direction. The protrusion 152 is provided on the first portion PS1 of the retaining groove 21C (i.e., the first housing 2L side). In the first direction A (left-right direction), the protrusion 152 is provided at the left end, which is the rear side of the retaining groove 21C. In the second direction B (front-back direction), the protrusion 152 is provided on one end (front side) and the other end (rear side) of the switch substrate 16C.

[0172] The protrusion 152 adheres tightly to the surface of the switch substrate 16C with elastic deformation. That is, when the switch substrate 16C is not inserted into the retaining groove 21C, the protrusion 152 protrudes downward to a position below the design position on the upper surface of the switch substrate 16C. Therefore, when the switch substrate 16C is inserted into the retaining groove 21C, the lower end of the protrusion 152 comes into contact with the upper surface of the switch substrate 16C and undergoes elastic deformation. In other words, when the switch substrate 16C is inserted into the retaining groove 21C, the protrusion 152 is crushed by the switch substrate 16C, and the protrusion 152 adheres tightly to the upper surface of the switch substrate 16C. The switch substrate 16C is sandwiched between the protrusion 152 and the lower surface of the retaining groove 21C inside the retaining groove 21C. As a result, the protrusion 152 prevents vertical play (looseness) of the switch substrate 16C inside the retaining groove 21C.

[0173] Next, the structure of the control panel 16 will be described. Figure 23 is an exploded perspective view of the control panel 16 seen from above. Figure 24 is an exploded perspective view of the control panel 16 seen from below. Figure 25 is a longitudinal cross-sectional view of the control panel 16 through the engaging claws.

[0174] As shown in Figures 23 and 24, in this embodiment, the operation panel 16 includes a switch board 16C, a switch SW (operation button 16A in this embodiment) mounted on the switch board 16C, and a switch plate 16D attached to the switch board 16C. The operation panel 16 also further includes an indicator display 16B.

[0175] The switch board 16C has a flat shape and a top surface 161 facing the panel opening 21B and a bottom surface 162 facing away from the panel opening 21B. In plan view, the switch board 16C has a roughly rectangular shape. The four corners of the switch board 16C are beveled. However, the planar shape of the switch board 16C is not limited to a rectangle and can be arbitrary.

[0176] A first notch 163 and a second notch 164 are formed on the outer periphery of the switch board 16C. The first notch 163 is provided on the left edge of the switch board 16C. As will be described later, a part of the first engaging claw 166 of the switch plate 16D is positioned in the first notch 163. The second notch 164 is provided on the right edge of the switch board 16C. As will be described later, a part of the second engaging claw 167 of the switch plate 16D is positioned in the second notch 164.

[0177] As shown in Figure 17, the switch board 16C is held in the retaining groove 21C. The switch board 16C is longer than the switch plate 16D in the second direction B (front-to-back direction). Both ends of the switch board 16C in the second direction B (front-to-back direction) are positioned within the retaining groove 21C. The switch board 16C is on which the switch SW (operation button 16A) and the indicator display 16B are mounted. The switch board 16C has a circuit pattern (not shown) formed thereon for connecting the switch SW and the indicator display 16B to the controller 18. The switch plate 16D is attached to the switch board 16C. The switch board 16C is on which the electrical circuit of the operation panel 16 is mounted and also functions as a support structure for supporting each component of the operation panel 16. Note that the lower surface 162 of the switch board 16C is provided with connection terminals 16E for lead wires to connect to the controller 18, as shown in Figure 17, but these are omitted from the illustration in Figures 23 to 25 for convenience.

[0178] The switch SW (operation button 16A) and indicator display 16B are mounted on the top surface 161 of the switch board 16C. The switch SW consists of an operation button 16A, but other types of switches such as DIP switches, rocker switches, or rotary switches may also be used. The indicator display 16B consists of LED elements. Four indicator display 16B are provided on the top surface 161 of the switch board 16C. The four indicator display 16B are arranged in a straight line with spacing between them in the first direction A (left-right direction). The switch SW is located on the other end (rear) of the second direction B (front-back direction) on the top surface 161 of the switch board 16C. The four indicator display 16B is located on the one end (front) of the second direction B (front-back direction) on the top surface 161 of the switch board 16C. The position and number of the switch SW are not limited to the illustrated example and are arbitrary. The position and number of indicator displays 16B are not limited to the example shown and are arbitrary.

[0179] The switch plate 16D is positioned on the upper surface 161 of the switch board 16C. The switch plate 16D is attached to the switch board 16C. The switch plate 16D is fixed to the housing 2 via the switch board 16C.

[0180] The switch plate 16D includes a plate portion 165, a first engaging claw 166 and a second engaging claw 167, and a switch label 168.

[0181] The plate portion 165 is the main body of the switch plate 16D, which has a flat plate shape. The plate portion 165 is made of, for example, resin. The plate portion 165 is installed on the upper surface 161 of the switch board 16C. In plan view, the plate portion 165 has a roughly rectangular shape. The four corners of the plate portion 165 are chamfered in an arc shape. The planar shape of the plate portion 165 corresponds to the shape of the panel opening 21B. The plate portion 165 fits inside the panel opening 21B.

[0182] The plate portion 165 has through holes that penetrate the plate portion 165 in the thickness direction (vertical direction). Specifically, the plate portion 165 has a switch hole 170 and an indicator hole 171.

[0183] A switch SW is positioned inside the switch hole 170. The switch hole 170 is circular in shape, but it may also be rectangular or other shapes, and its planar shape is arbitrary. The switch hole 170 provides space for the switch SW mounted on the switch board 16C and allows the switch to be operated from the outside (above).

[0184] The same number of indicator holes 171 as the number of indicator displays 16B (four in this embodiment) are provided. The four indicator holes 171 are separated from each other. One indicator display 16B is positioned inside one indicator hole 171. The indicator holes 171 secure space for the indicator displays 16B mounted on the switch board 16C and allow the illumination status of the indicator displays 16B to be seen from the outside (above). The separation of each indicator hole 171 prevents light leakage from individual indicator displays 16B. Each indicator hole 171 is rectangular, but it may be circular or other shapes, and the planar shape is arbitrary. Each indicator hole 171 may be shaped to correspond to the information displayed by the indicator display 16B (such as numbers indicating the operating mode or pictograms indicating the function being operated).

[0185] As shown in Figures 24 and 25, the first engaging claw 166 and the second engaging claw 167 are provided on the outer circumference of the plate portion 165 at positions opposite to each other. In this embodiment, the first engaging claw 166 is positioned on the left edge of the plate portion 165, and the second engaging claw 167 is positioned on the right edge of the plate portion 165. The first engaging claw 166 and the second engaging claw 167 face each other in the first direction A (left-right direction).

[0186] The first engaging claw 166 and the second engaging claw 167 each engage with the switch board 16C. The first engaging claw 166 and the second engaging claw 167 protrude downward from the plate portion 165. The first engaging claw 166 and the second engaging claw 167 pass from the upper side of the switch board 16C, along the side of the switch board 16C, and reach the lower part of the switch board 16C.

[0187] The first engaging claws 166 and the second engaging claws 167 contact the lower surface 162 of the switch substrate 16C from below. In other words, the plate portion 165 is located on the upper side of the switch substrate 16C, and the tips of the first engaging claws 166 and the second engaging claws 167 are located on the lower side of the switch substrate 16C. The switch plate 16D is attached to the switch substrate 16C by engaging the first engaging claws 166 and the second engaging claws 167, which extend from the plate portion 165, with the lower surface 162 of the switch substrate 16C.

[0188] The first engaging claw 166 has an L-shape that allows the switch substrate 16C to be positioned between the plate portion 165 and the first engaging claw 166. Specifically, the first engaging claw 166 has an intermediate portion 166A extending downward from the lower surface of the plate portion 165, and a tip portion 166B that bends to the right from the lower end of the intermediate portion 166A toward the center of the plate portion 165. The intermediate portion 166A passes outside (left side) of the left side surface of the switch substrate 16C. The intermediate portion 166A is positioned inside the first notch 163 on the outer periphery of the switch substrate 16C. As shown in Figure 24, the width WF1 of the intermediate portion 166A in the second direction B (front-to-back direction) is smaller than the width of the first notch 163 in the second direction B (front-to-back direction). The thickness of the intermediate portion 166A in the first direction A (left-to-right direction) is the same as or smaller than the depth of the first notch 163 in the first direction A (left-to-right direction). Therefore, the intermediate portion 166A fits inside the first notch 163 and does not protrude outward from the first notch 163 in the first direction A (left-right direction). The tip portion 166B overlaps with the switch substrate 16C in the vertical direction. The tip portion 166B faces the lower surface 162 of the switch substrate 16C in the vertical direction. The first engaging claw 166 engages with the left edge of the switch substrate 16C at the tip portion 166B.

[0189] The second engaging claw 167 has a snap-fit ​​shape that allows it to engage with and disengage from the switch substrate 16C by elastic deformation. Specifically, the second engaging claw 167 has an intermediate portion 167A extending downward from the lower surface of the plate portion 165, and a tip portion 167B that bends to the left from the lower end of the intermediate portion 167A toward the center of the plate portion 165. The intermediate portion 167A passes outside (right side) of the right side of the switch substrate 16C. The intermediate portion 167A is positioned inside the second notch 164 on the outer periphery of the switch substrate 16C. The width WF2 of the intermediate portion 167A in the second direction B (front-to-back direction) is smaller than the width of the second notch 164 in the second direction B (front-to-back direction). The thickness of the intermediate portion 167A in the first direction A (left-to-right direction) is the same as or smaller than the depth of the second notch 164 in the first direction A (left-to-right direction). Therefore, the intermediate portion 167A fits inside the second notch 164 and does not protrude beyond the second notch 164 in the first direction A (left-right direction). The tip portion 167B overlaps with the switch substrate 16C in the vertical direction. The tip portion 167B faces the lower surface 162 of the switch substrate 16C in the vertical direction. An inclined guide surface 167C is formed on the lower surface of the tip portion 167B. The guide surface 167C contacts the right edge of the switch substrate 16C and directs the external force applied from the switch substrate 16C outward (rightward) in the first direction A (left-right direction). The guide surface 167C makes it easier for the intermediate portion 167A to elastically deform outward when the second engaging claw 167 engages with the switch substrate 16C. The second engaging claw 167 engages with the right edge of the switch substrate 16C at the tip portion 167B.

[0190] Thus, in this embodiment, the second engaging claw 167 has a snap-fit ​​shape that undergoes elastic deformation, while the first engaging claw 166 is not a snap-fit ​​and engages with the switch substrate 16C without elastic deformation. When attaching the switch plate 16D to the switch substrate 16C, first, the left edge portion (first notch 163) of the switch substrate 16C is inserted inside the first engaging claw 166, and the left edge portion of the switch substrate 16C is engaged with the first engaging claw 166. Next, the right edge portion (second notch 164) of the switch substrate 16C is pressed against the guide surface 167C of the second engaging claw 167. The second engaging claw 167 elastically deforms so as to be pushed outward (to the right) in the first direction A (left-right direction) along the guide surface 167C. By elastically deforming the second engaging claw 167, the right edge of the switch substrate 16C is moved inward, passing through the tip 167B of the second engaging claw 167. Once the right edge of the switch substrate 16C has passed the tip 167B, the pressing force on the second engaging claw 167 is removed, and the second engaging claw 167 returns to its original position elastically. As a result, the tip 167B of the second engaging claw 167 engages with the lower surface of the right edge of the switch substrate 16C.

[0191] As shown in Figure 24, in this embodiment, the width WF1 of the first engaging claw 166 is greater than the width WF2 of the second engaging claw 167. Note that widths WF1 and WF2 are widths in the second direction B (front-to-back direction).

[0192] As shown in Figure 25, in this embodiment, the protrusion height HF1 of the first engaging claw 166 from the plate portion 165 is smaller than the protrusion height HF2 of the second engaging claw 167 from the plate portion 165. The protrusion heights HF1 and HF2 are the amount of protrusion downward (i.e., toward the switch board 16C) from the lower surface of the plate portion 165, and can also be described as the length of the engaging claw.

[0193] The first engaging claw 166 and the second engaging claw 167 are formed integrally with the plate portion 165. The first engaging claw 166 and the second engaging claw 167 may be fixed to the plate portion 165 separately. The switch plate 16D and the switch substrate 16C are fixed to each other, for example, by adhesive or adhesive tape (not shown). This improves the resistance to vibration when using the angle fastening tool 1. In this case, the first engaging claw 166 and the second engaging claw 167 function as temporary fasteners for fixing with adhesive or adhesive tape. The first engaging claw 166 and the second engaging claw 167 are positioned inside the first notch 163 and the second notch 164, respectively, and function as positioning to determine the relative position of the switch plate 16D and the switch substrate 16C in the second direction B (front-back direction). The switch plate 16D and the switch substrate 16C may be fixed to each other by the engaging claws without using adhesive or adhesive tape.

[0194] The plate portion 165 has a central portion 173 on its upper surface that is recessed relative to the peripheral portion 172. The central portion 173 is surrounded by the peripheral portion 172. The central portion 173 is flat and recessed downward (towards the switch substrate 16C) relative to the peripheral portion 172. In other words, the upper surface of the plate portion 165 has a rib-like peripheral portion 172 that protrudes upward from the central portion 173.

[0195] As shown in Figures 23 and 25, the switch label 168 is provided on the surface (top surface) of the plate portion 165. The switch label 168 is fixed to the plate portion 165 by, for example, adhesive or adhesive tape (not shown). The switch label 168 is positioned in the central portion 173 of the plate portion 165. The switch label 168 covers the switch SW. The switch label 168 is provided on the top surface of the central portion 173 of the plate portion 165 and covers and closes the upper opening of the switch hole 170. As a result, the top of the switch SW is covered by the switch label 168.

[0196] Similarly, the switch label 168 covers the indicator display unit 16B. The indicator display unit 16B fits inside the indicator hole 171 without protruding from it. The switch label 168 then covers and closes the upper opening of each indicator hole 171. As a result, the top of each indicator display unit 16B is covered by the switch label 168.

[0197] As shown in Figure 25, the switch label 168 has a pressing portion 174 with a convex cross-sectional shape including the top surface 175 and the corner portion 176. The pressing portion 174 is provided on the part of the switch label 168 that covers the upper opening of the switch hole 170. The pressing portion 174 protrudes above the planar portion of the switch label 168 that contacts the upper surface of the plate portion 165. In plan view, the pressing portion 174 has a circular shape corresponding to the switch hole 170. The planar shape of the pressing portion 174 is not particularly limited and may be rectangular or other polygonal, or any other arbitrary shape.

[0198] The pressing portion 174 has a trapezoidal cross-section. In this embodiment, the top surface 175, which has a circular planar shape, is a flat surface, and the periphery (circumference) of the top surface 175 forms a corner 176. The top surface 175 is located directly above the switch SW. The top surface 175 is the pressing surface when operating the switch SW. At least the pressing portion 174 of the switch label 168 is elastically deformable. When the top surface 175 of the pressing portion 174 is pressed, the top surface 175 sinks due to elastic deformation, and the switch SW (operating button 16A) is pressed via the pressing portion 174.

[0199] The top surface 175 is a flat surface. The corner portion 176 constitutes the peripheral edge of the top surface 175. The pressing portion 174 has a shape that protrudes upward from the outer circumference outside the corner portion 176, then bends at the corner portion 176 and connects to the flat top surface 175. Thus, the pressing portion 174 is not a rounded, dome-shaped convex shape, but is formed as a convex shape with an edge (corner portion 176) on the outer circumference of the top surface 175. The corner portion 176 is effective in allowing the position of the switch SW to be recognized by touch without relying on sight when operating the operation panel 16.

[0200] As shown in Figure 25, the top surface 175 of the pressing portion 174 is located below the peripheral edge 172 of the plate portion 165. That is, in this embodiment, the projection height HP1 of the peripheral edge 172 from the switch substrate 16C is greater than the projection height HP2 of the top surface 175 of the switch label 168 from the switch substrate 16C. The top surface 175 of the switch label 168 is located vertically between the upper end of the peripheral edge 172 and the upper surface of the central portion 173. The top surface 175, which is the pressing surface, is positioned in a recessed location on the operation panel 16. This prevents the pressing portion 174 from contacting the installation surface, even if the angle fastening tool 1 is placed on the installation surface with the tip tool holder 51 facing upwards. Therefore, unintended operations on the operation panel 16 can be prevented.

[0201] (Bearing retention structure) Figure 26 is a longitudinal cross-sectional view showing the area around the bevel gear 35 of the angle fastening tool 1 according to the embodiment. Figure 27 is an exploded perspective view showing the rear surface of the case 4 according to the embodiment. Figure 28 is an exploded perspective view showing the front surface of the motor housing portion 21 according to the embodiment. Figure 29 is an exploded perspective view showing the bevel gear 35, bearing 38F, and intermediate support member 91 according to the embodiment. Figure 30 is a longitudinal cross-sectional view showing the intermediate support member 91 according to the embodiment.

[0202] As described above, the angle fastening tool 1 includes a bearing 38F that rotatably holds the bevel gear 35. The bearing 38F contacts the rotor shaft portion 33 and rotatably holds the bevel gear 35 via the rotor shaft portion 33. The bearing 38F is held in the case 4. The bearing 38F is held at the rear of the case 4.

[0203] As shown in Figure 26, the angle fastening tool 1 comprises an intermediate support member 91 having a front surface that contacts the bearing 38F, and a fixing member FM that contacts the rear surface of the intermediate support member 91. The fixing member FM, together with the case 4, fixes the intermediate support member 91 by clamping it. Therefore, the bearing 38F is held in place by the fixing member FM and the case 4 clamping the bearing 38F and the intermediate support member 91 positioned on the rear surface of the bearing 38F.

[0204] The fixing member FM may be an independent member, or it may be integrally formed with the member of the angle fastening tool 1 so as to constitute a part of the member of the angle fastening tool 1. In this embodiment, the fixing member FM is integrally formed with the motor housing portion 21. The fixing member FM is a support wall 21G integrally formed with the motor housing portion 21. Therefore, the bearing 38F is sandwiched between the motor housing portion 21 and the case 4, which are connected in the front-rear direction.

[0205] The bearing 38F is a ball bearing having an inner ring 71, an outer ring 72, and balls 73. The rotor shaft portion 33 is fitted onto the inner ring 71. The front end of the inner ring 71 faces the rear surface of the bevel gear 35. The rear end of the inner ring 71 faces the stepped portion of the rotor shaft portion 33.

[0206] As shown in Figures 26 and 27, the case 4 has a recess 85 that extends forward from the rear of the case 4 and accommodates the bearing 38F. The bearing 38F is positioned inside the recess 85. The case 4 has an outer cylinder portion 86 on which the case flange portion 4F is formed, and an inner cylinder portion 87 on which the recess 85 is formed. The inner cylinder portion 87 is formed radially inward from the outer cylinder portion 86. The inner cylinder portion 87 is cylindrical in shape, and its inner diameter decreases in a stepped manner. That is, the inner cylinder portion 87 includes a recess 85 having an inner diameter D1 and a hole portion 88 having an inner diameter D2. The inner diameter D2 is smaller than the inner diameter D1. The recess 85 is a recess that extends forward from the rear surface of the case 4. The bearing 38F is positioned inside the recess 85. The bearing 38F is in contact with the inner circumferential surface of the housing recess 85 and the front surface of the housing recess 85 (the stepped portion with the hole 88), which corresponds to the bottom surface of the housing recess 85. The hole 88 is a through hole along the rotating shaft AX. The bevel gear 35 is positioned within the hole 88. The bevel gear 35 passes through the hole 88 and meshes with the driven gear 41A.

[0207] In this configuration, case 4 has a radial support surface 85A that supports the radial load acting on the bearing 38F, and a front support surface 85B that supports the forward thrust load acting on the bearing 38F. The radial support surface 85A is the inner circumferential surface of the housing recess 85. The front support surface 85B is the front (bottom) surface of the housing recess 85.

[0208] The radial support surface 85A is annular. The outer ring 72 of the bearing 38F is fitted onto the radial support surface 85A. The radial support surface 85A is provided with a groove 85D in which an O-ring 85C is placed. The O-ring 85C is in contact with the inner surface of the groove 85D and the outer ring 72.

[0209] The front support surface 85B is annular. The front support surface 85B faces the outer ring 72 of the bearing 38F in the front-rear direction. The front support surface 85B is in contact with the front end surface of the outer ring 72.

[0210] As shown in Figures 26, 28, and 29, the support wall 21G, which is a fixed member FM, directly or indirectly supports the rear surface of the bearing 38F on the front surface of the motor housing 21. In this embodiment, the support wall 21G indirectly supports the rear surface of the bearing 38F via an intermediate support member 91. The support wall 21G constitutes a part of the front surface of the motor housing 21.

[0211] Specifically, the front surface of the motor housing portion 21 includes a housing flange portion 21F with screw insertion holes 21H at its four corners, an annular rib 21E protruding forward from the housing flange portion 21F, and a support wall 21G. The annular rib 21E is positioned in the space between the outer cylinder portion 86 and the inner cylinder portion 87 of the case 4. The inner cylinder portion 87 is positioned on the inner circumference of the annular rib 21E. A projection 21J is provided at the lower part of the annular rib 21E, protruding forward. The projection 21J is inserted into an engagement hole 89 of the case 4. The projection 21J and the engagement hole 89 provide rotational positioning of the case 4 around the rotation axis AX relative to the motor housing portion 21.

[0212] The support wall 21G is positioned inside the annular rib 21E. The support wall 21G extends radially inward from the annular rib 21E. A central opening 92 is formed in the support wall 21G through which the rotor shaft portion 33 passes. The support wall 21G is ring-shaped. The support wall 21G faces the front support surface 85B of the housing recess 85 in the front-rear direction. The support wall 21G faces the bearing 38F in the front-rear direction. The support wall 21G faces the rear end surface of the outer ring 72 of the bearing 38F via the intermediate support member 91.

[0213] A recess 93 is formed on the front surface of the support wall 21G, in which the intermediate support member 91 is positioned. The recess 93 is recessed from the front to the rear. The recess 93 has a shape corresponding to the outer shape of the intermediate support member 91, and the intermediate support member 91 is positioned within the recess 93. The bottom surface of the recess 93, which is recessed to the rear, is the rear support surface 94 that contacts the rear surface of the intermediate support member 91. The rear support surface 94 supports the rearward thrust load acting on the bearing 38F. Thus, the motor housing 21 has a rear support surface 94 that supports the rearward thrust load acting on the bearing 38F. The rear support surface 94 is the front surface of the support wall 21G and is also the bottom surface of the recess 93 in which the intermediate support member 91 is positioned.

[0214] The intermediate support member 91 contacts the rear surface of the bearing 38F on its front surface and the fixed member FM on its rear surface. The front surface of the intermediate support member 91 contacts the rear end surface of the outer ring 72 of the bearing 38F. The rear surface of the intermediate support member 91 contacts the rear support surface 94 of the front surface of the support wall 21G, which is the fixed member FM. The intermediate support member 91 is a flat plate with a constant thickness.

[0215] The intermediate support member 91 is provided along the rear surface of the bearing 38F. The front surface of the intermediate support member 91 extends circumferentially along the rear end surface of the outer ring 72 of the bearing 38F. The intermediate support member 91 is provided so as to surround the rotor shaft portion 33 and has a C-shape including one end and the other end. That is, the intermediate support member 91 is not ring-shaped, and a gap CL is formed between the one end and the other end. In this embodiment, the gap CL is larger than the diameter of the rotor shaft portion 33 in a cross-section along the front surface of the intermediate support member 91. The inner circumference of the intermediate support member 91 is arc-shaped. Each side of the outer circumference of the intermediate support member 91 is straight, and the outer circumference of the intermediate support member 91 is rectangular except for the gap CL.

[0216] As described above, the fixing member FM, together with the case 4, secures the intermediate support member 91 solely by clamping it. "Securing solely by clamping" means that there is no structure to secure the intermediate support member 91 by any other means, such as screws or rivets, other than by clamping it between the fixing member FM and the case 4. The intermediate support member 91 does not have screw holes.

[0217] The intermediate support member 91 and the fixing member FM are elastically deformed by one of them. In other words, either the intermediate support member 91 or the fixing member FM is assembled in a state of compression in the front-rear direction by the force used to clamp the intermediate support member 91. As a result, there is no gap (play) in the front-rear direction of the bearing 38F between the case 4 and the fixing member FM.

[0218] Either the intermediate support member 91 or the fixing member FM may undergo elastic deformation, but in this embodiment, as shown in Figure 30, the fixing member FM undergoes elastic deformation. Specifically, the intermediate support member 91 has higher hardness than the fixing member FM. The intermediate support member 91 is made of metal. The fixing member FM is made of resin. The fixing member FM clamps the intermediate support member 91 with elastic deformation. The intermediate support member 91 is held in a state where its rear surface is slightly embedded in the fixing member FM. For convenience, the deformation state of the fixing member FM is not shown in the figures other than Figure 30.

[0219] In this embodiment, the width W1 of the rear surface of the intermediate support member 91 in the radial direction is greater than the width W2 of the outer ring 72 in the radial direction (i.e., the thickness of the outer ring 72). Therefore, the intermediate support member 91 makes contact with the fixed member FM over a larger area than the outer ring 72, thereby distributing the thrust load acting from the outer ring 72.

[0220] Here, we will explain the load acting on the bearing 38F. In this embodiment, the bevel gear 35 and the driven gear 41A are spiral bevel gears. A spiral bevel gear is a bevel gear in which the tooth traces are curved in a helical shape around the axis of rotation. Compared to a straight bevel gear in which the tooth traces are straight and extend radially, a spiral bevel gear has a larger contact area between gears and a larger number of teeth that mesh simultaneously, resulting in features such as high strength (high torque transmission), low noise, low vibration, and low wear.

[0221] In the rotational transmission of spiral bevel gears, not only radial loads but also thrust loads are generated. The thrust load depends on the tooth ratio of the bevel gear 35 and the driven gear 41A, but the direction of action of the thrust load may be reversed depending on the difference in the direction of rotation between forward and reverse rotation. Therefore, the bevel gear 35 may be subjected to radial loads in the radial direction and thrust loads in the forward and backward directions along the rotation axis AX.

[0222] In Figure 26, the thrust load acting on the bevel gear 35 is transmitted to the bearing 38F because the bevel gear 35 is fixed to the rotor shaft portion 33, and the inner ring 71 of the bearing 38F is fixed to the rotor shaft portion 33. The forward thrust load transmitted to the bearing 38F is supported by the front support surface 85B of the case 4 via the outer ring 72. The rearward thrust load transmitted to the bearing 38F acts on the intermediate support member 91 via the outer ring 72, and is further supported by the rear support surface 94 of the support wall 21G, which is a fixed member FM, via the intermediate support member 91. If the thickness of the outer ring 72 is small, the contact point with the outer ring 72 becomes close to line contact, and a large localized surface pressure acts. However, by interposing the intermediate support member 91 between the outer ring 72 and the rear support surface 94 and increasing the contact area with the rear support surface 94, the surface pressure acting on the rear support surface 94 formed on the resin motor housing portion 21 is reduced.

[0223] Furthermore, the radial load acting on the bevel gear 35 acts on the bearing 38F via the rotor shaft portion 33 and is supported by the radial support surface 85A of the case 4.

[0224] (Assembly workability of intermediate support members) Figure 31 is an exploded perspective view showing a subassembly of the rotor 27 according to the embodiment. As shown in Figure 31, when assembling the angle fastening tool 1, a subassembly is assembled in which related members such as the bearing 38F and the intermediate support member 91 are pre-assembled on the rotor 27. These members are assembled to the rotor shaft portion 33 so that the fan 12, intermediate support member 91, bearing 38F, and bevel gear 35 are arranged in order from rear to front. In this embodiment, since the intermediate support member 91 has a C-shape, it is possible to assemble the intermediate support member 91 radially to the rotor shaft portion 33 by passing the rotor shaft portion 33 through the gap CL. In other words, even if the bearing 38F and bevel gear 35 are installed first, the intermediate support member 91 can be installed in the predetermined position afterward. Therefore, even if the intermediate support member 91 is forgotten to be installed, it can be corrected retrospectively, resulting in high assembly efficiency.

[0225] (How to use) The method of using the angle fastening tool 1 according to the embodiment will now be described. For example, when performing a fastening operation on an object, the socket, which is the tip tool, is attached to the tip tool holder 51. When the operator operates the trigger lever 14, power is supplied from the battery 25, the motor 6 starts up, and light is emitted from the light-emitting element 53 of the light unit 17. Since the light from the light unit 17 is emitted downward from around the anvil 10, the light can reach the work area even in narrow spaces with many obstacles. The luminous intensity of the light emitted from the light unit 17 is high, and the work area can be brightly illuminated.

[0226] The rotor 27 rotates under the drive of the motor 6. As the rotor 27 rotates, its rotational force is transmitted to the spindle 8 via the reduction mechanism 7. The spindle 8 rotates at a rotational speed lower than the rotational speed of the rotor shaft 33. When the spindle 8 rotates with the hammer projection 47B and the anvil projection 10B in contact, the anvil 10 rotates together with the hammer 47 and the spindle 8. As the anvil 10 rotates, the tip tool rotates, and the fastening operation proceeds.

[0227] As the fastening process progresses, if a load exceeding a predetermined value is applied to the anvil 10 via the tip tool, the rotation of the anvil 10 and the hammer 47 stops. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the hammer 47 moves upward. As the hammer 47 moves upward, the contact between the hammer projection 47B and the anvil projection 10B is released, and the hammer 47, having moved upward, moves downward while rotating due to the elastic force of the coil spring 49. As the hammer 47 moves downward while rotating, the anvil 10 is struck in the rotational direction by the hammer 47. As a result, the anvil 10 and the tip tool rotate around the rotation axis BX with high torque. Therefore, the bolt or nut is tightened with high torque.

[0228] (effect) As described above, in this embodiment, the angle fastening tool 1 comprises a grip portion 22 extending in the front-rear direction, a motor housing portion 21 positioned in front of the grip portion 22, a motor 6 positioned inside the motor housing portion 21, a spindle 8 positioned in front of the motor 6 and extending in a direction intersecting the front-rear direction and rotated by the motor 6, a tip tool holder portion 51 rotated by the spindle 8, a trigger lever 14 provided on the grip portion 22, and a switch board 16C positioned in front of the trigger lever 14 and overlapping with the motor 6 in the vertical direction.

[0229] In the above configuration, the front-to-back position of the switch board 16C can be brought closer to the motor 6 until the switch board 16C overlaps with the motor 6 in the vertical direction. Accordingly, the trigger lever 14 can also be positioned near the rear of the switch board 16C. By bringing the switch board 16C, motor 6, and trigger lever 14 closer together in the front-to-back direction, the overall length of the angle fastening tool 1 can be reduced while improving the operability of the trigger lever 14 and the switch operation. As a result, the operability of the angle fastening tool 1 can be improved.

[0230] In this embodiment, the switch board 16C has a front end 16F that overlaps with the rear of the motor 6 in the vertical direction, and a rear end 16R that overlaps with the front of the trigger lever 14 in the vertical direction.

[0231] In the above configuration, the switch board 16C, motor 6, and trigger lever 14 can be brought sufficiently close together in the front-to-back direction. By concentrating these components near the gripping point, the overall length of the angle fastening tool 1 can be reduced while effectively improving the operability of the trigger lever 14 and switch operation.

[0232] In this embodiment, the motor 6 has a stator 26 and a rotor 27 rotatable relative to the stator 26. The angle fastening tool 1 is positioned in front of and behind the rotor 27, respectively, and includes bearings (38F, 38R) that rotatably support the rotor 27. The front-to-back distance L3 between the trigger lever 14 and the rear bearing 38R is smaller than the front-to-back length L10 of the switch board 16C.

[0233] In the above configuration, the trigger lever 14 can be brought closer to the rear bearing that supports the rotation of the motor 6. The overall length of the angle fastening tool 1 can be reduced, and by positioning the heavy motor 6 near the trigger lever 14, the center of gravity CG of the angle fastening tool 1 can be brought closer to the trigger lever 14. As a result, the tip tool holder 51 becomes easier to move, improving the handling of the angle fastening tool 1.

[0234] In one embodiment, the angle fastening tool 1 is connected to the switch board 16C via wiring and includes a controller 18 located behind the switch board 16C.

[0235] In the above configuration, by positioning the controller 18 behind the switch board 16C, it is not necessary to position the controller 18 below the switch board 16C. As a result, the space below the switch board 16C (between the motor 6 and the trigger lever 14) can be shortened in the front-to-back direction.

[0236] In one embodiment, the angle fastening tool 1 includes a battery holding portion 23 connected to the rear end of the grip portion 22, which detachably holds the battery 25. The controller 18 is located in the battery holding portion 23.

[0237] In the above configuration, the battery holder 23, where the battery 25 is mounted, can be used to secure space for housing the controller 18. Even when the controller 18 is positioned behind the switch board 16C, the overall length of the angle fastening tool 1 can be kept from increasing.

[0238] In this embodiment, the front-to-back distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-to-back distance L2 between the trigger lever 14 and the controller 18.

[0239] In the above configuration, the distance from the trigger lever 14 to the motor 6 on the front side can be shortened compared to the distance from the trigger lever 14 to the controller 18 on the rear side. As a result, the overall length of the angle fastening tool 1 can be reduced. When the heavy battery 25 is attached to the battery holder 23, it is easier to balance the weight between the front and rear sides of the trigger lever 14, and the angle fastening tool 1 can be handled more easily.

[0240] In this embodiment, the motor 6 has a stator 26 and a rotor 27 that is rotatable relative to the stator 26. The switch board 16C overlaps both the stator 26 and the rotor 27 in the vertical direction.

[0241] In the above configuration, the switch board 16C and the motor 6 can be brought even closer together in the front-to-back direction, thus reducing the overall length of the angle fastening tool 1. The center of gravity of the angle fastening tool 1 can be brought closer to the trigger lever 14, improving the handling of the angle fastening tool 1.

[0242] In this embodiment, the spindle 8 extends downward along a rotation axis BX that is perpendicular to the front-rear direction.

[0243] In the above configuration, the lower end of the angle fastening tool 1, where the spindle 8 is located, can be positioned in front of the work area, allowing for tightening.

[0244] In one embodiment, the angle fastening tool 1 comprises a hammer 47 that moves relative to the spindle 8, and an anvil 10 that is struck directly or indirectly in the rotational direction by the hammer 47. The tip tool holder 51 is positioned at the lower end of the anvil 10.

[0245] In the above configuration, even with the angle fastening tool 1, which is suitable for working in confined spaces, an impact tool is realized that can achieve high tightening torque through the impact of the hammer 47. Even when the hammer 47 is positioned on the front end of the angle fastening tool 1, the switch board 16C, motor 6, and trigger lever 14 can be brought closer together in the front-to-back direction, resulting in good weight balance and improved maneuverability.

[0246] In an embodiment, the angle fastening tool 1 includes a grip portion 22 extending in the front-rear direction, a motor housing portion 21 disposed in front of the grip portion 22, a motor 6 disposed inside the motor housing portion 21, a spindle 8 disposed in front of the motor 6, extending in a direction intersecting the front-rear direction, and rotated by the motor 6, a tip tool holding portion 51 rotated by the spindle 8, a trigger lever 14 provided on the grip portion 22, a switch substrate 16C provided with a switch, and a controller 18 connected to the motor 6, the switch substrate 16C, and the trigger lever 14 via wiring. The motor 6, the switch substrate 16C, the trigger lever 14, and the controller 18 are arranged in this order from the front to the rear.

[0247] In the above configuration, the controller 18 is disposed behind the motor 6, the switch substrate 16C, and the trigger lever 14. Since the switch substrate 16C is disposed near the surface of the housing, the distance between the motor 6 and the trigger lever 14 can be shortened because the controller 18 is not disposed near the switch substrate 16C between the motor 6 and the trigger lever 14. Since the switch substrate 16C, the motor 6, and the trigger lever 14 can be brought closer in the front-rear direction, the operability of the trigger lever 14 and switch operation can be improved while suppressing the overall length of the angle fastening tool 1. As a result, the operability of the angle fastening tool 1 can be improved.

[0248] [[ID=~]] In an embodiment, the motor 6 has a stator 26 and a rotor 27 rotatable with respect to the stator 26. The angle fastening tool 1 includes bearings (38F, 38R) disposed on the front side and the rear side with respect to the rotor 27, respectively, and rotatably supporting the rotor 27. The front end portion 16F of the switch substrate 16C is disposed in front of the rear bearing 38R.

[0249] In the above configuration, since the switch substrate 16C is brought closer to the motor 6, the switch substrate 16C, the motor 6, and the trigger lever 14 can be brought closer still further.

[0250] In this embodiment, the front end 16F of the switch board 16C is positioned in front of the rear end of the motor 6.

[0251] In the above configuration, the switch board 16C overlaps with the motor 6 in the vertical direction. This further reduces the distance between the motor 6, the switch board 16C, and the trigger lever 14.

[0252] In one embodiment, the angle fastening tool 1 (electric work machine) comprises a housing 2, an operating panel 16 including a switch board 16C, a switch SW mounted on the switch board 16C, and a switch plate 16D attached to the switch board 16C so as to surround at least a portion of the switch SW. The housing 2 has a panel opening 21B in which the switch plate 16D is placed, and a retaining groove 21C formed on the inner surface of the housing 2. The switch board 16C is held in the housing 2 by a portion of the switch board 16C being inserted into the retaining groove 21C.

[0253] In the above configuration, the switch board 16C, which is subjected to external forces when the switch SW is operated, can be directly held by the housing 2. However, if the switch plate 16D is held by the housing 2, the switch board 16C and the switch plate 16D must be firmly fixed with screws or the like to withstand the external forces, and then the switch plate 16D must be fixed to the housing 2, which would increase the size of the operation panel 16. In contrast, in the above configuration, the external forces acting on the switch board 16C are supported by the housing 2, so the switch plate 16D does not need to support the external forces, and the fixing of the switch plate 16D can be simplified. Therefore, the structure of the operation panel 16 can be simplified and made smaller.

[0254] In this embodiment, the housing 2 is configured by connecting a first housing 2L, which includes a panel opening 21B and a first portion PS1 of the retaining groove 21C, and a second housing 2R, which includes a panel opening 21B and a second portion PS2 of the retaining groove 21C. The retaining groove 21C is provided on at least one of the one end and the other end of the switch substrate 16C at the mating surface of the first housing 2L and the second housing 2R, and extends in a first direction A perpendicular to the mating surface FS.

[0255] In the above configuration, the switch board 16C is inserted in the first direction A into the retaining groove 21C (first part PS1 or second part PS2) of either the first housing 2L or the second housing 2R, and then the first housing 2L and the second housing 2R are joined at the mating surface FS, thereby holding the switch board 16C within the retaining groove 21C. This facilitates the assembly of the switch board 16C while firmly holding it in place.

[0256] In this embodiment, the retaining groove 21C is provided on both one end and the other end of the switch substrate 16C.

[0257] In the above configuration, both ends of the switch board 16C can be supported by the retaining grooves 21C. The switch board 16C can be securely held against external forces when operating the switch SW. Switch operation is often performed while wearing work gloves, making it difficult to control the amount of force applied. With the above configuration, the switch board 16C can be sufficiently held even when a large external force is applied to it.

[0258] In this embodiment, the first portion PS1 of the retaining groove 21C has a first clearance CL1 between it and the switch substrate 16C in a second direction B that connects one end and the other end of the switch substrate 16C in a cross-section along the mating surface FS. The second portion PS2 of the retaining groove 21C has a second clearance CL2 between it and the switch substrate 16C that is larger than the first clearance CL1 in the second direction B.

[0259] In the above configuration, the small first clearance CL1 of the first portion PS1 of the retaining groove 21C suppresses play in the switch board 16C within the retaining groove 21C. The large second clearance CL2 of the second portion PS2 of the retaining groove 21C makes it easier to fit the retaining groove 21C (second portion PS2) of the second housing 2R onto the switch board 16C, which is inserted into the retaining groove 21C (first portion PS1) of the first housing 2L. In other words, because the second clearance CL2 is large, the switch board 16C can be easily inserted into the retaining groove 21C of the second housing 2R when joining the second housing 2R to the first housing 2L at the mating surface FS.

[0260] In this embodiment, at least one of the first housing 2L and the second housing 2R has a support surface 151 that supports the switch substrate 16C at a position adjacent to the switch substrate 16C on the opposite side from the panel opening 21B. The support surface 151 is provided at a position that contacts the edge of the switch substrate 16C in the first direction A.

[0261] In the above configuration, the external force acting on the switch board 16C when the switch SW is operated can be absorbed not only by the retaining groove 21C but also by the support surface 151.

[0262] In this embodiment, both the first housing 2L and the second housing 2R have a support surface 151.

[0263] In the above configuration, the support strength against external forces acting on the switch board 16C can be further improved by each support surface 151.

[0264] In this embodiment, the retaining groove 21C has a protrusion 152 that projects toward the surface of the switch substrate 16C on which the switch SW is mounted. The protrusion 152 adheres tightly to the surface of the switch substrate 16C with elastic deformation.

[0265] In the above configuration, the convex portion 152 is elastically deformed by the switch substrate 16C within the holding groove 21C, thereby preventing play in the thickness direction of the switch substrate 16C and enabling the switch substrate 16C to reliably contact the support surface 151.

[0266] In the embodiment, the switch plate 16D has a plate portion 165 and first engaging claws 166 and second engaging claws 167 that are provided at positions on the outer periphery of the plate portion 165 facing each other and engage with the switch substrate 16C, respectively.

[0267] In the above configuration, screwing is unnecessary, and the switch plate 16D can be easily attached to the switch substrate 16C.

[0268] In the embodiment, the first engaging claw 166 has an L-shaped configuration in which the switch substrate 16C can be disposed between the plate portion 165 and the first engaging claw 166. The second engaging claw 167 has a snap-fit configuration that can engage with and disengage from the switch substrate 16C by elastic deformation.

[0269] In the above configuration, the switch plate 16D can be attached to the switch substrate 16C by engaging the second engaging claw 167 with the switch substrate 16C while deforming it in a state where the switch substrate 16C is engaged with the first engaging claw 166. Compared with the case where both the first engaging claw 166 and the second engaging claw 167 have a snap-fit configuration, the attachment structure of the switch plate 16D to the switch substrate 16C can be made smaller and have higher strength.

[0270] In the embodiment, the width WF1 of the first engaging claw 166 is larger than the width WF2 of the second engaging claw 167.

[0271] In the above configuration, the mechanical strength of the first engaging claw 166, which is not a snap-fit, can be improved. By reducing the width WF2 of the second engaging claw 167, which is a snap-fit, it becomes easier to deform, and thus the force required for attaching the switch plate 16D can be reduced.

[0272] In this embodiment, the protrusion height HF1 of the first engaging claw 166 from the plate portion 165 is smaller than the protrusion height HF2 of the second engaging claw 167 from the plate portion 165.

[0273] In the above configuration, reducing the protrusion height HF1 improves the mechanical strength of the non-snap-fit ​​first engaging claw 166. Increasing the protrusion height HF2 makes the snap-fit ​​second engaging claw 167 more deformable, thus reducing the force required to mount the switch plate 16D.

[0274] In this embodiment, the outer periphery of the switch substrate 16C is formed with a first notch 163 where a part of the first engaging claw 166 is located, and a second notch 164 where a part of the second engaging claw 167 is located.

[0275] In the above configuration, the first engaging claw 166 and the second engaging claw 167 do not protrude from the outer periphery of the switch board 16C, or the amount of protrusion is reduced, so the operation panel 16 can be made smaller. In addition, since the first engaging claw 166 and the second engaging claw 167 are positioned inside the first notch 163 and the second notch 164, respectively, the relative position of the switch board 16C and the switch plate 16D can also be positioned. This improves the workability of assembling the operation panel 16.

[0276] In this embodiment, the switch plate 16D includes a plate portion 165 having a thickness greater than that of the switch SW, and a switch label 168 provided on the surface of the plate portion 165 and covering the switch SW. The switch label 168 has a pressing portion 174 with a convex cross-sectional shape including a top surface 175 and corners 176.

[0277] In the above configuration, the switch SW can be operated by pressing the switch label 168. Because the switch label 168 has corners 176, the unevenness of the switch label 168 can be easily recognized even when wearing work gloves. For example, compared to a case where the switch label 168 is a smooth dome shape, the operability of the switch when using the angle fastening tool 1 (electric work machine) is improved.

[0278] In this embodiment, the plate portion 165 has a central portion 173 that is recessed relative to the peripheral portion 172. The switch label 168 is positioned in the central portion 173 of the plate portion 165. The projection height HP1 of the peripheral portion 172 from the switch substrate 16C is greater than the projection height HP2 of the top surface 175 of the switch label 168 from the switch substrate 16C.

[0279] In the above configuration, the switch label 168 is recessed compared to the peripheral edge 172 of the plate portion 165. Therefore, unintended switch operation can be suppressed when the angle fastening tool 1 (electric work machine) is placed with the operation panel 16 facing the installation surface, or when the angle fastening tool 1 (electric work machine) comes into contact with an obstacle during operation.

[0280] [Second Embodiment] A second embodiment will now be described. In the following description, components that are the same as or equivalent to those in the above-described embodiment will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0281] Figure 32 is a perspective view showing the intermediate support member 91A according to the second embodiment. Figure 33 is an exploded perspective view showing the subassembly of the motor 6 according to the second embodiment.

[0282] In the first embodiment, an example was shown in which the intermediate support member 91 has a C-shape, but in this second embodiment, the intermediate support member 91A has an annular shape.

[0283] The intermediate support member 91A has an annular shape that follows the rear surface of the bearing 38F. The intermediate support member 91A has a circular inner circumference and a roughly rectangular outer circumference. The four corners of the outer circumference of the intermediate support member 91A are chamfered. The annular intermediate support member 91A is in contact with the rear surface of the bearing 38F around its entire circumference.

[0284] Unlike the C-shaped intermediate support member 91, the annular-shaped intermediate support member 91A cannot be assembled to the rotor shaft portion 33 from the radial direction. Therefore, the fan 12, intermediate support member 91A, bearing 38F, and bevel gear 35 are assembled to the rotor shaft portion 33 from the front in the axial direction.

[0285] [Third Embodiment] A third embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0286] Figure 34 is a cross-sectional view showing the intermediate support member 91B according to the third embodiment.

[0287] In the second embodiment, an intermediate support member 91A with a circular inner circumference and a square outer circumference was shown, but the intermediate support member 91B according to this third embodiment has an annular shape.

[0288] The intermediate support member 91B has an annular shape that follows the rear surface of the bearing 38F. The intermediate support member 91B has a circular inner circumference and a circular outer circumference. In other words, the intermediate support member 91B is an annular washer. The annular intermediate support member 91B is in contact with the rear surface of the bearing 38F around its entire circumference. The intermediate support member 91B is a flat plate with a constant thickness.

[0289] During the assembly of the subassembly, the fan 12, intermediate support member 91B, bearing 38F, and bevel gear 35 are assembled axially from the front to the rotor shaft 33 in that order.

[0290] [Fourth Embodiment] A fourth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0291] Figure 35 is a cross-sectional view showing the intermediate support member 91C according to the fourth embodiment. Figure 36 is a longitudinal cross-sectional view showing the periphery of the intermediate support member 91C according to the fourth embodiment.

[0292] In the third embodiment, an intermediate support member 91B with a constant thickness and an annular shape was shown, but the intermediate support member 91C according to this fourth embodiment has a stepped annular shape.

[0293] The intermediate support member 91C has an annular shape that follows the rear surface of the bearing 38F. The intermediate support member 91C has a circular inner circumference and a circular outer circumference. In other words, the intermediate support member 91C is an annular shape. The annular intermediate support member 91C is in contact with the rear surface of the bearing 38F around its entire circumference.

[0294] The intermediate support member 91C has a step between its inner circumference and outer circumference, with the position offset in the thickness direction. In other words, the intermediate support member 91C has an outer circumference portion 101 and an inner circumference portion 102 that is inside the outer circumference portion 101, with the outer circumference portion 101 shifted forward of the inner circumference portion 102. The thickness of the intermediate support member 91C is constant, and the thickness of the inner circumference portion 102 and the thickness of the outer circumference portion 101 are substantially the same.

[0295] In the fourth embodiment, the fixing member FM (support wall 21G) of the motor housing portion 21 is provided with an outer peripheral mounting portion 103 that contacts the rear surface of the outer peripheral portion 101 of the intermediate support member 91C, and an inner peripheral mounting portion 104 that contacts the rear surface of the inner peripheral portion 102 of the intermediate support member 91C. The outer peripheral mounting portion 103 is shifted forward of the inner peripheral mounting portion 104, corresponding to the front-rear positional displacement between the outer peripheral portion 101 and the inner peripheral portion 102.

[0296] In the fourth embodiment, the position of the peripheral wall constituting the housing recess 85 of the case 4 is also shifted forward, corresponding to the outer periphery of the intermediate support member 91C and the outer mounting portion 103 of the motor housing portion 21. As a result, the depth D3 of the housing recess 85 of the case 4 (depth from the rear to the front) is smaller than the thickness D4 of the bearing 38F in the front-rear direction. The bearing 38F protrudes rearward from the rear end of the housing recess 85. The rear end of the bearing 38F is located behind the outer periphery 101 of the intermediate support member 91C and contacts the front surface of the inner periphery 102 of the intermediate support member 91C.

[0297] In this structure, the rearward thrust load acting on the bearing 38F is applied to the inner circumference 102 of the intermediate support member 91C. Since the intermediate support member 91C is in contact with the motor housing 21 at both its inner circumference 102 and outer circumference 101, the thrust load applied to the intermediate support member 91C is supported at both the inner circumference 102 and outer circumference 101 by the inner mounting portion 104 and the outer mounting portion 103, respectively.

[0298] In the fourth embodiment, since the outer peripheral mounting portion 103 is shifted forward, the thickness required to support the thrust load in the support wall 21G of the motor housing portion 21 can be provided on the forward side. As a result, the rear surface of the support wall 21G of the motor housing portion 21 can be made to not protrude backward, and space for installing the fan 12 can be easily secured.

[0299] [Fifth Embodiment] A fifth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0300] Figure 37 is a longitudinal cross-sectional view showing the intermediate support member 91D and the fixing member FM according to the fifth embodiment.

[0301] In the first embodiment, an example was shown in which the fixing member FM, of the intermediate support member 91 and the fixing member FM, undergoes elastic deformation. In this fifth embodiment, an example is shown in which the intermediate support member 91D, of the intermediate support member 91D and the fixing member FM, undergoes elastic deformation.

[0302] In the fifth embodiment, the intermediate support member 91D is made of resin. The fixing member FM is made of metal. The fixing member FM clamps the intermediate support member 91D while elastically deforming it. Also in the fifth embodiment, the bearing 38F is a sliding bearing.

[0303] In the fifth embodiment, the intermediate support member 91D and the bearing 38F are held by being sandwiched in the front-rear direction between a metal case 4 and a metal fixing member FM. The fixing member FM, together with the case 4, fixes the intermediate support member 91D solely by sandwiching it.

[0304] The intermediate support member 91D is elastically deformed by being sandwiched between the fixed member FM and the bearing 38F. The intermediate support member 91D is deformed so that the rear surface of the bearing 38F bites into the front surface of the intermediate support member 91D. As a result, no gap (play) occurs between the fixed member FM and the case 4, in front of or behind the bearing 38F.

[0305] [Sixth Embodiment] A sixth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0306] Figure 38 is a longitudinal cross-sectional view showing the front part of the angle fastening tool 1A according to the sixth embodiment.

[0307] In the first embodiment, an example was shown in which the bevel gear 35 is a pinion gear fixed to the rotor shaft portion 33. However, in this sixth embodiment, the bevel gear 135 is provided separately from the pinion gear fixed to the rotor shaft portion 33, and the bevel gear 135 is provided on a different shaft from the rotor shaft portion 33.

[0308] The angle fastening tool 1A according to the sixth embodiment includes a bevel gear 135 that is indirectly rotated by a rotor 27 and has a shaft 111 that extends in the front-rear direction. The angle fastening tool 1A also includes a spur gear 112, which is a pinion gear, that is directly rotated by the rotor 27. The bevel gear 135 rotates around the shaft 111 due to the rotational force of the spur gear 112.

[0309] The spur gear 112 is fixed to the rotor shaft portion 33. The spur gear 112 is fixed by being press-fitted into the tip of the rotor shaft portion 33. The spur gear 112 rotates together with the rotor 27 (rotor shaft portion 33). The rotor shaft portion 33 is rotatably held by the rotor bearing 113F. The spur gear 112 meshes with the driven gear 114.

[0310] The driven gear 114 is a spur gear. The driven gear 114 is fixed to the rear end of the shaft 111. The driven gear 114 is fixed by being press-fitted to the rear end of the shaft 111. The driven gear 114 rotates together with the shaft 111 and the bevel gear 135. The driven gear 114 rotates by reducing the rotation of the spur gear 112. The driven gear 114 constitutes the first stage of the reduction gear of the reduction mechanism 7.

[0311] The shaft 111 extends along the front-rear direction. The shaft 111 is parallel to the rotation axis AX of the motor 6. The shaft 111 is housed in the case 4. The shaft 111 is positioned radially offset with respect to the rotation axis AX.

[0312] The bevel gear 135 is positioned in front of the spur gear 112 and the driven gear 114. The bevel gear 135 is either integrally formed with the end of the shaft 111 or fixed separately to the end of the shaft 111. The bevel gear 135 is housed in the case 4. The bevel gear 135 rotates around the central axis of the shaft 111. The bevel gear 135 meshes with the first intermediate gear 115A, which is provided on the intermediate shaft 115C.

[0313] The intermediate shaft 115C extends in a direction intersecting the rotation axis AX and axis 111. The intermediate shaft 115C extends along the vertical direction perpendicular to the rotation axis AX and axis 111 and is rotatable about a central axis in the vertical direction. Both ends of the intermediate shaft 115C are rotatably supported by intermediate bearings 116. The intermediate bearings 116 are held in case 4. The first intermediate gear 115A and the second intermediate gear 115B are fixed to the intermediate shaft 115C. The intermediate shaft 115C, the first intermediate gear 115A, and the intermediate shaft 115C rotate together. The first intermediate gear 115A meshes with the bevel gear 135. The first intermediate gear 115A is a bevel gear. The first intermediate gear 115A rotates by reducing the rotation of the bevel gear 135. The bevel gear 135 and the first intermediate gear 115A constitute the second stage of the reduction gear section 7. The second intermediate gear 115B is a spur gear. The second intermediate gear 115B meshes with the spindle gear 8C of the spindle 8. The spindle gear 8C rotates by reducing the rotation of the second intermediate gear 115B. The second intermediate gear 115B and the spindle gear 8C constitute the third stage of the reduction gear section 7.

[0314] The bearing 139 is supported by the case 4 and rotatably holds the bevel gear 135. The bearing 139 is in contact with the shaft 111 and rotatably supports the shaft 111. The bearing 139 rotatably holds the bevel gear 135 via the shaft 111.

[0315] The bearing 139 is housed in a housing recess 118 of the case 4. The housing recess 118 has a radial support surface 118A and a front support surface 118B. The bearing 139 is a ball bearing. In the example shown in Figure 38, two sets of bearings 139 are provided, arranged axially.

[0316] The intermediate support member 91E has a front surface that contacts the bearing 139. The intermediate support member 91E may be C-shaped or annular. In the sixth embodiment, the intermediate support member 91E is housed in the case 4. The intermediate support member 91E covers a portion of the rear opening of the housing recess 118. The intermediate support member 91E contacts the rear end surface of the outer ring of the rear bearing 139 located in the housing recess 118.

[0317] In the sixth embodiment, the fixing member FM is provided separately from the motor housing 21 and the case 4. In the sixth embodiment, the fixing member FM is made of metal and is a gear case that houses the spur gear 112 and the driven gear 114. The fixing member FM is positioned between the case 4 and the motor housing 21 so as to straddle the case 4 and the motor housing 21 in the front-rear direction.

[0318] The fixed member FM includes a first housing chamber 121 recessed from the front to the rear and a second housing chamber 122 recessed from the rear to the front. The first housing chamber 121 houses the spur gear 112 and the driven gear 114. The second housing chamber 122 houses the rotor bearing 113F. The second housing chamber 122 is continuous with the first housing chamber 121 in the front-rear direction. The tip of the rotor shaft portion 33 is positioned inside the first housing chamber 121, passing through the second housing chamber 122.

[0319] Case 4 has a front housing portion 119 that accommodates the front part of the fixing member FM. The front housing portion 119 is a recess that extends forward from the rear surface of Case 4. A housing recess 118 for the bearing 139 is formed on the front wall surface corresponding to the bottom surface of the front housing portion 119. The front housing portion 119 and the housing recess 118 are continuous. Therefore, the intermediate support member 91E is positioned on the front wall surface corresponding to the bottom surface of the front housing portion 119. The front part of the fixing member FM fits into the front housing portion 119. As a result, the fixing member FM contacts the rear surface of the intermediate support member 91E at its front surface. The fixing member FM contacts the rear surface of the intermediate support member 91E at the front end surface portion of the peripheral wall that partitions the first housing chamber 121.

[0320] The motor housing 21 has a rear housing portion 120 that accommodates the rear of the fixing member FM. The rear housing portion 120 is a recess that extends from the front to the rear of the motor housing 21. The rear of the fixing member FM fits into the rear housing portion 120. Although not shown, the motor housing 21 and the case 4 are connected in the front-rear direction and fastened together by screws 70 oriented in the front-rear direction, similar to the first embodiment. The motor housing 21 and the case 4 are tightened together in the front-rear direction by the axial force of the screws 70, bringing them closer to each other. As a result, the bearing 139, the intermediate support member 91E, and the fixing member FM are sandwiched between the motor housing 21 and the case 4 and held in place by the axial force of the screws 70. Consequently, the fixing member FM, together with the case 4, fixes the intermediate support member 91E solely by sandwiching it. The intermediate support member 91E is simply positioned in the front housing section 119 and is fixed in place by being sandwiched between the front surface of the fixing member FM and the front support surface 118B of the case 4, together with the bearing 139.

[0321] [Other embodiments] In the above-described embodiment, the multiple light-emitting elements 53 do not have to be arranged along the circumferential direction of the anvil 10. The multiple light-emitting elements 53 may be arranged radially in the radial direction of the anvil 10, for example. The optical member 57 does not have to be annular surrounding the anvil 10, and may have a shape corresponding to the arrangement of the multiple light-emitting elements 53. The optical member 57 may be, for example, arc-shaped, square-shaped, radial, etc. The optical member 57 may be provided individually for each light-emitting element 53. The multiple light-emitting elements 53 only need to be held in the case 4, and may be arranged at the rear of the bottom surface of the case 4, or at the lower part of the side surface, etc. For example, the light-emitting elements 53 may emit light diagonally downward from the rear of the bottom surface of the case 4 toward the bottom of the anvil 10. There do not have to be multiple light-emitting elements 53; there may be only one.

[0322] In the above embodiment, the angle fastening tool 1 is an impact wrench. The angle fastening tool 1 may also be an impact driver. When the angle fastening tool 1 is an impact driver, the tip tool holder 51 includes a bit hole provided at the lower end of the anvil shaft portion 10A. The bit hole is provided so as to extend rearward from the front end of the anvil shaft portion 10A. The driver bit, which is the tip tool, is held in a state where it is inserted into the bit hole. In this case, the tip tool holder 51 may be equipped with a tool holding mechanism that is inserted into the bit hole and holds the driver bit in a detachable manner.

[0323] Furthermore, the angle fastening tool 1 may be an angle fastening tool other than an impact tool. In other words, the angle fastening tool 1 does not need to include a striking mechanism 9 including a hammer 47 and an anvil 10. In this case, the tip tool holder 51 may be provided at the tip of the spindle 8 and rotate together with the spindle 8, or it may be provided separately from the spindle 8 and rotated by the spindle 8 via a power transmission mechanism. Examples of angle fastening tools 1 other than impact tools include electric ratchet wrenches, electric angle drivers, and electric angle drills.

[0324] In the above embodiment, the support wall 21G indirectly supports the rear surface of the bearing 38F via the intermediate support member 91, but the intermediate support member 91 may not be provided, and the support wall 21G may directly support the rear surface of the bearing 38F.

[0325] In the embodiment described above, the power source for the angle fastening tool 1 does not have to be the battery 25, but may also be a commercial power source (AC power source).

[0326] [Seventh Embodiment] A seventh embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0327] Figure 39 is a perspective view from below showing the front of the angle fastening tool 1B according to the seventh embodiment. Figure 40 is a bottom view showing the front of the angle fastening tool 1B according to the seventh embodiment.

[0328] In the first embodiment, an example was shown in which the light unit 17 has an annular shape surrounding the anvil 10. However, the light unit 201 according to this seventh embodiment has a non-annular shape and is located further away from the anvil 10 than in the first embodiment.

[0329] The light unit 201 is positioned on the lower surface of the case 4. The light unit 201 is positioned around the cylindrical portion 82. The light unit 201 is positioned around the anvil 10 via the cylindrical portion 82. In the seventh embodiment, the light unit 201 does not surround the anvil 10, but is provided to be localized behind the anvil 10.

[0330] The light unit 201 includes multiple light-emitting elements 53. The light-emitting elements 53 are held in the case 4. The light-emitting elements 53 are held on the lower surface of the case 4. Multiple light-emitting elements 53 are provided around the anvil 10.

[0331] In the seventh embodiment, the multiple light-emitting elements 53 are arranged along the radial direction of the anvil 10. The multiple light-emitting elements 53 are positioned behind the anvil 10 in the radial direction. The multiple light-emitting elements 53 are arranged in a straight line behind the anvil 10. The multiple light-emitting elements 53 may also be arranged along the rotational direction (circumferential direction) of the anvil 10, or in a straight line along the left-right direction. The arrangement of the multiple light-emitting elements 53 is not limited to a straight line; it may also be arranged in a planar (array) pattern in a predetermined pattern such as vertically and horizontally.

[0332] Figure 41 is an exploded perspective view from below showing the mounting of the light cover 204 to the case 4 according to the seventh embodiment. Figure 42 is a longitudinal cross-sectional view along the front-to-rear direction showing the light unit 201 according to the seventh embodiment.

[0333] The light unit 201 has a substrate 202 on which a plurality of light-emitting elements 53 are provided, and an optical member 203. The substrate 202 is formed in a linear (rectangular) shape along the front-to-back direction, corresponding to the linear arrangement of the plurality of light-emitting elements 53. Multiple light-emitting elements 53 are arranged on the lower surface of the substrate 202, spaced apart in the front-to-back direction. In this embodiment, two light-emitting elements 53 are provided. The number of light-emitting elements 53 may be one or three or more. By providing multiple light-emitting elements 53, sufficient light intensity and light irradiation range can be ensured.

[0334] The optical member 203 is positioned to cover the front of the multiple light-emitting elements 53. At least a portion of the optical member 203 is positioned in front of the light unit 201. The optical member 203 is continuous, spanning across the multiple light-emitting elements 53. The light-transmitting portion 203B of the optical member 203 faces the multiple light-emitting elements 53. The light-transmitting portion 203B covers two light-emitting elements 53 together.

[0335] A portion of the optical element 203 is covered from below by the light cover 204. The portion of the optical element 203 that covers the multiple light-emitting elements 53 is exposed and not covered by the light cover 204. That is, the light-transmitting portion 203B that covers the multiple light-emitting elements 53 is exposed downwards through the opening 205A of the light cover 204. Light from the multiple light-emitting elements 53 passes through the light-transmitting portion 203B and exits downwards towards the case 4 through the opening 205A of the light cover 204.

[0336] As shown in Figures 41 and 42, the optical member 203 is formed in a case shape that covers a plurality of light-emitting elements 53 and a substrate 202, with the top side open. The optical member 203 has a side wall portion 203A, a light-transmitting portion 203B, and a protruding portion 203C.

[0337] The side wall portion 203A is rectangular in shape. A substrate 202 on which multiple light-emitting elements 53 are mounted is placed inside the side wall portion 203A. The side wall portion 203A surrounds the multiple light-emitting elements 53 and the substrate 202 all around (front, back, left, and right). The top surface of the side wall portion 203A is an open opening. The light-transmitting portion 203B closes the bottom surface of the side wall portion 203A. The light-transmitting portion 203B constitutes the bottom surface of the optical member 203. The side wall portion 203A and the light-transmitting portion 203B constitute an optical member 203 that is roughly rectangular in shape with an open top surface. The light-transmitting portion 203B is rectangular (rounded rectangle) when viewed from below. The light-transmitting portion 203B faces the bottom surface of the substrate 202. The light-transmitting portion 203B faces the light-emitting elements 53 in the vertical direction. Light emitted from the light-emitting element 53 passes through the light-transmitting section 203B. The lower surface of the light-transmitting section 203B constitutes the light-emitting surface of the light unit 201. The light-transmitting section 203B protrudes downward from the lower end of the side wall section 203A. When viewed from below, the light-transmitting section 203B is formed in a rectangular shape that is slightly smaller than the outer shape of the side wall section 203A. For this reason, a stepped shoulder section 203D (see Figure 42) is formed at the boundary between the lower end of the side wall section 203A and the outer circumference of the light-transmitting section 203B.

[0338] The protrusion 203C is provided so as to project laterally from the side wall portion 203A. In the seventh embodiment, the protrusion 203C projects to the left from the left side of the side wall portion 203A. By being positioned inside the guide groove 214A of the case 4, the protrusion 203C functions as a positioning portion for the light unit 201 relative to the case 4.

[0339] As shown in Figure 42, the upper surface of the substrate 202 is positioned below the upper end of the side wall portion 203A. The substrate 202 and the multiple light-emitting elements 53 are placed in a concave housing space formed by the side wall portion 203A and the light-transmitting portion 203B of the optical member 203. Molding resin 58 is filled into the housing space. The molding resin 58 fixes the multiple light-emitting elements 53, the substrate 202, the optical member 203, and a portion of the lead wire 65 to each other. Note that the molding resin 58 may be omitted.

[0340] Case 4 holds the light unit 201. The light unit 201, which includes multiple light-emitting elements 53, is held on the underside of case 4. An angle fastening tool 1B is positioned on the underside of case 4 and includes a light cover 204 that holds the light-emitting elements 53 and covers the lead wires 65.

[0341] The light cover 204 is separate from the motor housing 21. The light cover 204 is separate from the case 4. The light cover 204 engages with the motor housing 21. The light cover 204 is mounted on the lower surface of the case 4. The light cover 204 holds the light unit 201 on the lower surface of the case 4. The light unit 201 is held between the lower surface of the case 4 and the light cover 204.

[0342] The light cover 204 is a single component in which the light-emitting element holding portion 205 and the cover portion 206 are integrally formed.

[0343] The light-emitting element holder 205 is positioned on the lower surface of the case 4 and holds a plurality of light-emitting elements 53. The light-emitting element holder 205 is positioned on the lower surface of the case 4, adjacent to the cylindrical portion 82 on the rear side. The light-emitting element holder 205 covers the area around the installation position of the light unit 201. An opening 205A is formed in the light-emitting element holder 205, exposing the light-transmitting portion 203B of the optical member 203. The opening 205A penetrates from the lower surface to the upper surface of the light-emitting element holder 205. The light-transmitting portion 203B is positioned inside the opening 205A. The opening 205A is formed to have substantially the same planar shape as the light-transmitting portion 203B, allowing for dimensional tolerances. The peripheral edge of the opening 205A contacts the shoulder portion 203D of the optical member 203. As shown in Figure 42, the light-emitting element holder 205 supports the shoulder portion 203D (lower end of the side wall portion 203A) of the optical member 203 from below at the periphery of the opening 205A. In this way, the light-emitting element holder 205 supports the entire light unit 201, including the light-emitting element 53, from below by supporting the shoulder portion 203D of the optical member 203.

[0344] As shown in Figures 40 and 41, the light-emitting element holder 205 is fixed to the lower surface of the case 4 by a screw 60S, which tightens the light-emitting element holder 205 toward the lower surface of the case 4. The light-emitting element holder 205 holds multiple light-emitting elements 53 by pressing the lower surface (shoulder portion 203D) of the optical member 203 toward the case 4 with the peripheral edge of the opening 205A. The light-emitting element holder 205 presses the outer peripheral edge of the lower surface of the optical member 203. The light-emitting element holder 205 may also simply support the optical member 203 from below without pressing it.

[0345] As shown in Figure 41, the light-emitting element holder 205 is fixed to the optical member 203 at multiple locations by screws 60S. Specifically, the light-emitting element holder 205 is fixed to the light unit 201 at two locations on both sides in the left-right direction by two screws 60S. Screw holes 211A are formed in the flat mounting surface 211 on the lower surface of the case 4. In the seventh embodiment, the mounting surface 211 is the bottom surface of the groove 212. The two screw holes 211A are located on both the left and right sides of the light source arrangement section 213 where the light unit 201 is placed. The light-emitting element holder 205 has through holes 205B into which the screws 60S are attached. The screws 60S pass through the through holes 205B of the light-emitting element holder 205 from below and are fixed to the screw holes 211A.

[0346] The cover portion 206 covers the lead wire 65. The lead wire 65 extends from the light unit 201 to the motor housing portion 21 along the bottom surface of the case 4. In other words, the lead wire 65 extends from the lower opening 21D on the front of the motor housing portion 21 to the bottom surface of the case 4. The lead wire 65 extends forward along the bottom surface of the case 4 and connects to the circuit board 202 of the light unit 201. The lead wire 65 connects to multiple light-emitting elements 53 on the circuit board 202 to supply power.

[0347] Figure 43 is a bottom view showing the front of the angle fastening tool 1B with the light cover 204 removed according to the seventh embodiment. As shown in Figure 43, in the seventh embodiment, the lead wire 65 is not provided with a connector (connector 66A and connector 66B) and is directly connected to the circuit board 202 of the light unit 201.

[0348] As shown in Figures 41 and 43, the case 4 has a groove 212 on its lower surface for arranging the lead wires 65. The groove 212 is a concave portion that is recessed upward from the lower surface of the case 4. The groove 212 is provided on the lower surface of the case 4, along the front-rear direction, from the rear end of the cylindrical portion 82 to the rear end of the case 4. The lead wires 65 are arranged in the groove 212.

[0349] In the seventh embodiment, the case 4 has a light source arrangement section 213 on the lower surface of the case 4 in which a plurality of light-emitting elements 53 are arranged. The light source arrangement section 213 is located on the lower surface of the case 4, behind the rear end of the cylindrical portion 82. The light source arrangement section 213 is located at a predetermined position inside the groove portion 212.

[0350] Specifically, a guide wall 214 is formed on the mounting surface 211, which is the bottom surface of the groove 212, rising downward from the mounting surface 211. The guide wall 214 defines the placement positions of the light source placement section 213 and the lead wires 65 within the groove 212. Two screw holes 211A are formed inside the groove 212 and outside the guide wall 214. The guide wall 214 is formed to surround the light source placement section 213 (in the front and left / right directions). The light unit 201 and optical member 203 are placed in the light source placement section 213 surrounded by the guide wall 214. A guide groove 214A is formed in a part of the guide wall 214 surrounding the light source placement section 213. The guide groove 214A is a recessed groove formed by partially cutting out the guide wall 214, and is formed on the guide wall 214 to the left of the light source placement section 213. The protrusion 203C of the optical element 203 is positioned in this guide groove 214A. This determines the in-plane position (front-to-back and left-to-right direction) of the light unit 201.

[0351] The guide wall 214 leaves the rear side of the light source placement section 213 open. The guide wall 214 extends from both the left and right sides of the light source placement section 213 toward the rear. The lead wire 65 is placed in the area between the guide walls 214 on both the left and right sides. Also, the ground wire 67, which connects to the ground terminal 84B, is placed in the area between the guide walls 214 on both the left and right sides. The lead wire 65 and the ground wire 67 are located inside the same groove 212 and in the area between the guide walls 214 on both the left and right sides.

[0352] The guide wall 214 forms a narrow passage 84A at its rear end. The passage 84A extends to the rear surface of the case 4. The lead wire 65 and ground wire 67 extending from the lower opening 21D (see Figure 41) of the motor housing 21 pass through the passage 84A.

[0353] As shown in Figure 41, the cover portion 206 covers the lead wire 65 and the ground wire 67. The cover portion 206 extends rearward from the rear end of the light-emitting element holding portion 205. The cover portion 206 extends to the front of the motor housing portion 21.

[0354] The cover portion 206 has a claw portion 62A that engages with the motor housing portion 21. The claw portion 62A protrudes rearward from the rear end of the cover portion 206. The claw portion 62A engages with the motor housing portion 21 by being inserted into the lower opening 21D of the motor housing portion 21. The rear end of the cover portion 206 is movable in the front-rear direction but not downward due to the engagement between the motor housing portion 21 and the claw portion 62A. The cover portion 206 is fixed to the case 4 with the claw portion 62A engaged with the motor housing portion 21. The cover portion 206 covers the entire lower opening 21D of the motor housing portion 21.

[0355] The light cover 204, which includes the light-emitting element holding portion 205 and the cover portion 206, covers the lower surface of the case 4 from the rearward side of the cylindrical portion 82. The light cover 204 fits inside the groove portion 212 and covers the groove portion 212. The light cover 204 covers the portion of the optical element 203 other than the light-transmitting portion 203B, while exposing the light-transmitting portion 203B.

[0356] When assembling the angle fastening tool 1B, the assembler places the light unit 201 and optical element 203 in the light source placement section 213, positions the lead wires 65 and ground wires 67 within the area between the guide walls 214, and then attaches the light cover 204 to the case 4. The light cover 204 is fixed to the case 4 by two screws 60S that pass through the insertion holes 205B, with the claw portion 62A inserted and engaged into the lower opening 21D of the motor housing section 21. When the light cover 204 is fixed to the case 4, the light unit 201, positioned by the guide groove 214A, is placed within the opening 205A of the light cover 204. The periphery of the opening 205A holds the optical element 203 between the light cover 204 and the lower surface of the case 4.

[0357] Figure 44 is a longitudinal cross-sectional view showing the front of the angle fastening tool 1B according to the seventh embodiment. Next, the position of the light-emitting element 53 according to the seventh embodiment will be described with reference to Figure 44.

[0358] In the seventh embodiment, the light-emitting element 53 is held on the lower surface of the housing portion of the case 4 for the reduction gear mechanism 7.

[0359] The reduction gear 7 is housed in the case 4 and transmits the rotational force of the motor 6 to the spindle 8. The reduction gear 7 is connected to the bevel gear 35, which is the pinion gear of the motor 6, and to the spindle gear 8C of the spindle 8. In the front-rear direction, the reduction gear 7 is positioned between the bearing 38F, which rotatably holds the bevel gear 35, and the spindle 8. The reduction gear 7 is positioned behind the spindle 8 and connects to the spindle 8 from the rear. The reduction gear 7 includes a first reduction unit 41 connected to the bevel gear 35 (pinion gear) and a second reduction unit 42 connected to the first reduction unit 41 and the spindle gear 8C. The first reduction unit 41 and the second reduction unit 42 are aligned in the front-rear direction. The second reduction unit 42 is positioned in front of the first reduction unit 41.

[0360] Multiple light-emitting elements 53, i.e., the light unit 201, are positioned on the lower surface of the case 4, overlapping vertically with the reduction gear mechanism 7. More specifically, the multiple light-emitting elements 53 overlap vertically with the second reduction gear 42 of the reduction gear mechanism 7. The multiple light-emitting elements 53 are positioned on the lower surface of the housing portion of the case 4 that contains the second intermediate gear 42A and the second intermediate shaft 42B, which constitute the second reduction gear 42. The multiple light-emitting elements 53 are positioned on the lower surface of the end portion of the housing portion of the reduction gear mechanism 7 that is on the spindle 8 side.

[0361] In the example shown in Figure 44, the housing space of case 4 can be understood as being divided into multiple parts. That is, case 4 includes a first part 221 that houses the spindle 8 and hammer 47, and a second part 222 that is continuous with the rear of the first part 221. In the seventh embodiment, the light-emitting element 53 is held on the lower surface of the second part 222 of case 4.

[0362] In detail, the first part 221 of case 4 houses a striking mechanism 9 including a spindle 8 and a hammer 47, and an anvil 10 is positioned to protrude downward from the lower surface (cylindrical portion 82) of the first part 221.

[0363] The second part 222 of case 4 houses the reduction gear 7. The first part 221 and the second part 222 are separated by a first bulkhead 224. The second intermediate gear 42A of the second reduction gear 42 passes over the first bulkhead 224 and meshes with the spindle gear 8C. The first bulkhead 224 defines the front end of the housing space for the reduction gear 7.

[0364] In the example shown in Figure 44, case 4 includes a third portion 223 following a second portion 222. The third portion 223 has a housing recess 85 that accommodates a bearing 38F. The second portion 222 and the third portion 223 are separated by a second partition wall 225 with a hole 88. The driven gear 41A of the first reduction gear 41 meshes with the bevel gear 35 that passes through the hole 88. The second partition wall 225 defines the rear end of the housing space of the reduction gear mechanism 7.

[0365] The multiple light-emitting elements 53, i.e., the light unit 201, are positioned on the underside of the second part 222 between the first part 221 and the third part 223. With respect to their front-to-back position, the multiple light-emitting elements 53 are positioned either vertically overlapping with the first bulkhead 224 or behind the first bulkhead 224. The multiple light-emitting elements 53 are positioned either vertically overlapping with the second bulkhead 225 or in front of the second bulkhead 225. The multiple light-emitting elements 53 are positioned on the first part 221 side of the second part 222, i.e., the side closer to the anvil 10. Therefore, the multiple light-emitting elements 53 are positioned behind the spindle 8 and the striking mechanism 9, and close to the anvil 10. In the case of an impact wrench, a socket is attached to the tip tool holder 51 of the anvil 10 as a tip tool, and the outer diameter of the socket may be large depending on the size of the bolt or other fastening to be used. In the seventh embodiment, the light unit 201 is positioned in the vicinity of the anvil 10 but at a suitable distance, so that even when a large cutting tool is attached, shadows are less likely to be formed due to the light from the light unit 201 being blocked by the cutting tool.

[0366] Incidentally, in angle fastening tools used for fastening work in confined spaces, it is desirable that the vertical dimension of the front end (head) of the case 4, where the tip tool holder 51 is provided, be small. In the example shown in Figure 44, the vertical dimension of the head is suppressed by suppressing the vertical dimension of each sliding surface that rotatably supports the spindle 8 and the anvil 10. Specifically, the vertical dimensions of the sliding surface of the spindle bearing 44 that rotatably supports the upper end of the spindle 8, the sliding surface 47E of the hammer 47 with the spindle 8, and the sliding surface of the anvil bearing 46 are suppressed. The vertical dimension of the sliding surface of the spindle bearing 44 is smaller than the vertical dimension of the sliding surface of the intermediate bearing 42C that supports the second intermediate shaft 42B of the reduction mechanism 7. Both the spindle bearing 44 and the intermediate bearing 42C are sliding bearings. The vertical dimension of the sliding surface 47E of the hammer 47 with the spindle 8 is less than or equal to 1 / 2 of the vertical dimension Hs of the through hole through which the spindle 8 of the hammer 47 is inserted. The vertical dimension of the sliding surface of the anvil bearing 46 is 26% or less of the vertical dimension (total length) of the anvil 10.

[0367] Figure 45 is a longitudinal cross-sectional view showing the angle fastening tool 1B according to the seventh embodiment. Figure 46 is a longitudinal cross-sectional view showing the middle portion of the angle fastening tool 1B according to the seventh embodiment. Figure 47 is a longitudinal cross-sectional view illustrating the vertical positional relationship of each part of the angle fastening tool 1B according to the seventh embodiment.

[0368] Next, with reference to Figures 45 to 48, the positional relationships of the parts of the angle fastening tool 1B according to the seventh embodiment will be described. First, the vertical positional relationships of the parts will be described.

[0369] As shown in Figure 45, in the seventh embodiment, similar to the first embodiment, the lower end 14B of the trigger lever 14 is positioned closer to the lower surface 21P of the motor housing 21 than the lower end of the tip tool holder 51 in the vertical direction. The lower surface 21P of the motor housing 21 is located above the lower end of the tip tool holder 51. The vertical distance H2 from the lower end 14B of the trigger lever 14 to the lower surface 21P of the motor housing 21 is smaller than the vertical distance H1 from the lower end 14B of the trigger lever 14 to the lower end of the tip tool holder 51. The lower end 14B of the trigger lever 14 may be located above the lower surface 21P of the motor housing 21.

[0370] As shown in Figure 46, the trigger lever 14 includes a pressing surface 301 that is pressed when pulled. The trigger lever 14 includes a pivot shaft 302 that rotates the pressing surface 301 as it is pressed. The pressing surface 301 is the part of the trigger lever 14 that is exposed and not covered by the housing 2, and is the surface that is pressed by the fingers. The pivot shaft 302 is a columnar member that extends left and right inward from the cross-section shown in Figure 46. The pivot shaft 302 is rotatably supported by the housing 2. The pivot shaft 302 and the pressing surface 301 are connected by a pivot arm 303. When the pressing surface 301 is pressed upward by the pulling operation, the trigger lever 14 rotates toward the switch body 14A around the pivot shaft 302, and the switch body 14A is operated.

[0371] The pressing surface 301 extends to the lower end 14B of the trigger lever 14 and is curved in a concave shape. The concave curve of the pressing surface 301 makes it easier for the fingers to fit onto the pressing surface 301 when pulling the lever.

[0372] Specifically, the pressing surface 301 has a first end 301A, a second end 301B, and an intermediate section 301C. The first end 301A is located at the lower end 14B of the trigger lever 14. The second end 301B is the end on the opposite side (front side) from the first end 301A. The portion of the trigger lever 14 in front of the second end 301B is covered by the housing 2. The intermediate section 301C is the portion between the first end 301A and the second end 301B. The intermediate section 301C is a concave portion that curves upward. The intermediate section 301C curves above the first end 301A and the second end 301B. The deep curvature of the intermediate section 301C above the first end 301A and the second end 301B makes it easier to hold the fingers on the pressing surface 301.

[0373] As shown in Figure 45, the intermediate portion 301C is located above the lower surface 21P of the motor housing portion 21 and below the lower surface of the grip 22A. Therefore, even when fingers are placed on the pressing surface 301, the fingers are less likely to protrude below the lower surface 21P of the motor housing portion 21.

[0374] Figures 45 to 47 show an example in which a smaller battery 325 than the one in Figure 4 is mounted in the battery holder 23. In this case, the lower end 14B of the trigger lever 14 is located above the lower surface of the battery 325. The lower surface of the battery 325 is located below the lower end 14B of the trigger lever 14 and above the lower end of the tip tool holder 51.

[0375] As shown in Figure 47, the lower end 14B of the trigger lever 14 is located above the straight line 311 connecting the lower end of the tip tool holder 51 and the rear end of the lower surface of the battery 325. The straight line 311 connecting the lower end of the tip tool holder 51 and the rear end of the lower surface of the battery 325 is a part that may come into contact with the mounting surface when the angle fastening tool 1B is placed facing downwards on a mounting surface such as a workbench. Because the lower end 14B of the trigger lever 14 is located above the straight line 311, even when the angle fastening tool 1B is placed in a position where the tip tool holder 51 is facing downwards, the trigger lever 14 is less likely to come into contact with the mounting surface or objects on the mounting surface.

[0376] Furthermore, as shown in Figure 47, the operation panel 16 is located below the straight line 312 that connects the front upper end position UF, which is the uppermost position of the motor housing 21 and case 4, and the rear upper end position UR, which is the uppermost position of the grip 22 and battery holding 23. The straight line 312 connecting the front upper end position UF and the rear upper end position UR is a part that may come into contact with the mounting surface when the angle fastening tool 1B is placed facing upward on a mounting surface such as a workbench. The operation panel 16 is exposed on the upper surface of the motor housing 21. Because the operation panel 16 is located below the straight line 312, even when the angle fastening tool 1B is placed in a position where the tip tool holding part 51 is facing upward, the operation panel 16 is less likely to come into contact with the mounting surface or objects on the mounting surface.

[0377] In the example shown in Figure 47, the front upper end position UF is the upper surface near the connection point between the motor housing 21 and the case 4. In the example shown in Figure 47, the rear upper end position UR is the upper surface of the battery holding section 23.

[0378] Figure 48 is a perspective view of the battery holding portion 23 of the angle fastening tool 1B according to the seventh embodiment, viewed from the rear and diagonally above. As shown in Figure 48, the battery holding portion 23 has a dome-shaped portion 23A that bulges upward. The upper surface of the dome-shaped portion 23A includes the rear upper end position UR. Due to the upward bulge of the dome-shaped portion 23A, the upper surface of the battery holding portion 23 (rear upper end position UR) is positioned above the upper surface of the grip portion 22.

[0379] On the upper surface of the angle fastening tool 1B, the area between the front upper end position UF and the rear upper end position UR is less likely to come into contact with the mounting surface or objects on the mounting surface, even when the angle fastening tool 1B is placed in a position where the tip tool holder 51 is facing upwards.

[0380] Furthermore, as shown in Figure 47, the controller 18 is positioned behind the switch board 16C. The controller 18 is located in the battery holding section 23. The controller 18 is located inside the dome-shaped section 23A. The internal space of the dome-shaped section 23A has a large vertical height. Therefore, even when tall electronic components 18H, such as discrete capacitors, are mounted on the controller 18, sufficient space for the controller 18 can be secured.

[0381] Next, we will explain the positional relationship of each part in the front-to-back direction.

[0382] As shown in Figure 46, in the seventh embodiment, similar to the first embodiment, the switch board 16C is positioned in front of the trigger lever 14 and overlaps with the motor 6 in the vertical direction. The front end 16F of the switch board 16C overlaps with the rear of the motor 6 in the vertical direction, and the rear end 16R overlaps with the front of the trigger lever 14 in the vertical direction. The switch board 16C extends in the front-rear direction and is positioned across the position above the motor 6 and the position above the trigger lever 14.

[0383] The front end 16F of the switch board 16C is positioned in front of the rear end of the motor 6. The front end 16F of the switch board 16C is positioned in front of the rear bearing 38R. The rear end 16R of the switch board 16C is positioned behind the front of the trigger lever 14.

[0384] Furthermore, the front-to-back distance L3 between the trigger lever 14 and the rear bearing 38R of the motor 6 is smaller than the front-to-back length L10 of the switch board 16C (the distance between the front end 16F and the rear end 16R).

[0385] Furthermore, in the front-to-back direction, the distance L11 from the center of the pivot shaft 302 to the operation button 16A is smaller than the distance L12 from the center of the pivot shaft 302 to the rear end of the pressing surface 301 (i.e., the first end 301A). Since the operation button 16A and the trigger lever 14 are located close together in the front-to-back direction, operability is improved, such as being able to operate both the operation button 16A and the trigger lever 14 with one hand.

[0386] Figure 49 is a longitudinal cross-sectional view illustrating the front-to-back positional relationship of each part of the angle fastening tool 1B according to the seventh embodiment.

[0387] In angle fastening tool 1B, which is used for work in confined spaces, it is assumed that the worker will hold the angle fastening tool 1B at a distance from their body by reaching out, and that the fastening work will be performed with the tip tool holder 51 facing in various directions. Compared to pistol-type power tools, it is desirable that the angle fastening tool 1B be easier to operate even when fastening work is performed at any angle and in any direction.

[0388] Figure 49 shows the center of gravity CG of the angle fastening tool 1B with the battery 325 installed. In the angle fastening tool 1B, the motor 6 and the components housed in the case 4 in front of the motor 6 (reduction mechanism 7, spindle 8, impact mechanism 9, and anvil 10), including the case 4, are mainly made of metal, so there is a heavy object at the front. On the other hand, the angle fastening tool 1B holds the heavy battery 325 at the battery holding part 23 at the rear end. The grip part 22 and trigger lever 14 located between the battery 325 and the motor 6 are relatively light, so they have little effect on the center of gravity CG. For this reason, the center of gravity CG is usually biased towards the front where the heavy object is concentrated, and the center of gravity CG tends to be farther away from the grip part 22 (trigger lever 14). The further the center of gravity CG is from the grip part 22 (trigger lever 14), the more force is required to change and maintain the posture of the angle fastening tool 1B, and the operability (ease of handling) of the angle fastening tool 1B decreases.

[0389] As shown in Figure 49, in the seventh embodiment, similar to the first embodiment, the front-to-back distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-to-back distance L2 between the trigger lever 14 and the controller 18. The front-to-back distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-to-back distance L4 between the trigger lever 14 and the battery holder 23. Because the distance L1 between the trigger lever 14 (grip portion 22) and the motor 6 is small, the center of gravity CG of the angle fastening tool 1B is brought closer to the trigger lever 14 (grip portion 22).

[0390] In the example shown in Figure 49, with the battery 325 attached, the center of gravity CG of the angle fastening tool 1B is closer to the lower end 14B of the trigger lever 14 than to the tip tool holder 51 in the front-rear direction. With the battery 325 attached, the center of gravity CG is closer to the trigger lever 14 than to the tip tool holder 51 in the front-rear direction. The center of gravity CG is closer to the trigger lever 14 than to the second intermediate shaft 42B in the front-rear direction. The center of gravity CG is closer to the trigger lever 14 than to the first intermediate shaft 41C in the front-rear direction.

[0391] In Figure 49, the center of gravity position CG is located between the front end of the motor 6 and the lower end 14B of the trigger lever 14 in the front-rear direction (inside the range 330). Specifically, with the battery 325 installed, the center of gravity position CG is located between the front end 16F and the rear end 16R of the switch board 16C in the front-rear direction. In other words, with the battery 325 installed, the center of gravity position CG is located behind the front end 16F of the switch board 16C in the front-rear direction. The center of gravity position CG is located in front of the rear end 16R of the switch board 16C in the front-rear direction. In the example of Figure 49, with the battery 325 installed, the center of gravity position CG is located between the rotor core 32 and the rear bearing 38R.

[0392] In the example shown in Figure 49, the battery 325 is a smaller type than the battery 25 in Figure 4. Since the battery 325 is heavier than the battery 25, the center of gravity position CG shifts rearward in the case of Figure 4. Even when the battery 25 from Figure 4 is installed, the center of gravity position CG is located in front of the trigger lever 14 in the front-to-back direction. When the battery 25 from Figure 4 is installed, the center of gravity position CG is even closer to the trigger lever 14 than the position shown in Figure 49.

[0393] Next, the shape of the grip portion 22 will be described. As shown in Figure 45, in the seventh embodiment, similar to the first embodiment, the circumference of the narrowest part 22N of the grip portion 22 is smaller than the circumference of the narrowest part 21N of the motor housing portion 21.

[0394] Figure 50 is a cross-sectional view of the grip portion 22 according to the seventh embodiment, viewed from the front. Figure 50 shows the cross-section of the narrowest part 22N of the grip portion 22. As shown in Figure 50, the cross-section of the grip portion 22 perpendicular to the front-rear direction has a width W12 in the left-right direction that is smaller than the width W11 in the up-down direction. The cross-sectional shape of the grip portion 22 perpendicular to the front-rear direction is barrel-shaped. That is, the cross-sectional shape of the grip portion 22 has a maximum left-right dimension (width W12) at the center in the up-down direction, and the left-right dimension decreases as it approaches the upper and lower ends. Also, the cross-sectional shape of the grip portion 22 has a maximum up-down dimension (width W11) at the center in the left-right direction, and the up-down dimension decreases as it approaches the right and left ends. The outer circumference of the grip portion 22 is composed of smooth curves and has no corners. This makes it easier for the grip portion 22 to fit snugly in the hand when the worker grasps the grip portion 22 with their hand, enabling a stable grip.

[0395] (effect) As described above, in the seventh embodiment, the angle fastening tool 1 comprises a grip portion 22 extending in the front-rear direction, a motor housing portion 21 positioned in front of the grip portion 22, a motor 6 positioned inside the motor housing portion 21, a spindle 8 positioned in front of the motor 6 and extending in a direction intersecting the front-rear direction and rotated by the motor 6, a tip tool holder portion 51 rotated by the spindle 8, a trigger lever 14 provided on the grip portion 22, and a switch board 16C positioned in front of the trigger lever 14 and overlapping with the motor 6 in the vertical direction.

[0396] In the above configuration, the front-to-back position of the switch board 16C can be brought closer to the motor 6 until the switch board 16C overlaps with the motor 6 in the vertical direction. Accordingly, the trigger lever 14 can also be positioned near the rear of the switch board 16C. By bringing the switch board 16C, motor 6, and trigger lever 14 closer together in the front-to-back direction, the overall length of the angle fastening tool 1 can be reduced while improving the operability of the trigger lever 14 and the switch operation. As a result, the operability of the angle fastening tool 1 can be improved.

[0397] In the seventh embodiment, the switch board 16C has a front end 16F that overlaps with the rear of the motor 6 in the vertical direction, and a rear end 16R that overlaps with the front of the trigger lever 14 in the vertical direction.

[0398] In the above configuration, the switch board 16C, motor 6, and trigger lever 14 can be brought sufficiently close together in the front-to-back direction. By concentrating these components near the gripping point, the overall length of the angle fastening tool 1 can be reduced while effectively improving the operability of the trigger lever 14 and switch operation.

[0399] In the seventh embodiment, the motor 6 has a stator 26 and a rotor 27 rotatable relative to the stator 26. The angle fastening tool 1 is positioned in front of and behind the rotor 27, respectively, and includes bearings (38F, 38R) that rotatably support the rotor 27. The front-to-back distance L3 between the trigger lever 14 and the rear bearing 38R is smaller than the front-to-back length of the switch board 16C.

[0400] In the above configuration, the trigger lever 14 can be brought closer to the rear bearing that supports the rotation of the motor 6. The overall length of the angle fastening tool 1 can be reduced, and by positioning the heavy motor 6 near the trigger lever 14, the center of gravity CG of the angle fastening tool 1 can be brought closer to the trigger lever 14. As a result, the tip tool holder 51 becomes easier to move, improving the handling of the angle fastening tool 1.

[0401] In the seventh embodiment, the angle fastening tool 1 includes a controller 18 that is connected to the switch board 16C via wiring and is located behind the switch board 16C.

[0402] In the above configuration, by positioning the controller 18 behind the switch board 16C, it is not necessary to position the controller 18 below the switch board 16C. As a result, the space below the switch board 16C (between the motor 6 and the trigger lever 14) can be shortened in the front-to-back direction.

[0403] In the seventh embodiment, the angle fastening tool 1 includes a battery holding portion 23 connected to the rear end of the grip portion 22, which detachably holds the battery 325. The controller 18 is located in the battery holding portion 23.

[0404] In the above configuration, the battery holder 23, where the battery 325 is mounted, can be used to secure space for housing the controller 18. Even when the controller 18 is positioned behind the switch board 16C, the overall length of the angle fastening tool 1 can be kept from increasing.

[0405] In the seventh embodiment, the front-to-back distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-to-back distance L2 between the trigger lever 14 and the controller 18.

[0406] In the above configuration, the distance from the trigger lever 14 to the motor 6 on the front side can be shortened compared to the distance from the trigger lever 14 to the controller 18 on the rear side. As a result, the overall length of the angle fastening tool 1 can be reduced. When the heavy battery 325 is attached to the battery holder 23, it is easier to balance the weight between the front and rear sides of the trigger lever 14, and the angle fastening tool 1 can be handled more easily.

[0407] In the seventh embodiment, the switch board 16C has an operating button 16A. The trigger lever 14 includes a pressing surface 301 that is pressed when pulled, and a pivot shaft 302 that rotates the pressing surface 301 as it is pressed. In the front-rear direction, the distance from the center of the pivot shaft 302 to the operating button 16A is smaller than the distance from the center of the pivot shaft 302 to the rear end of the pressing surface 301.

[0408] In the above configuration, the operation button 16A can be brought sufficiently close to the trigger lever 14. Therefore, while the operator is holding the grip portion 22, the operability of both the pulling operation of the pressing surface 301 of the trigger lever 14 and the pressing operation of the operation button 16A can be improved.

[0409] In the seventh embodiment, the motor 6 has a stator 26 and a rotor 27 that is rotatable relative to the stator 26. The switch board 16C overlaps both the stator 26 and the rotor 27 in the vertical direction.

[0410] In the above configuration, the switch board 16C and the motor 6 can be brought even closer together in the front-to-back direction, thus reducing the overall length of the angle fastening tool 1. The center of gravity of the angle fastening tool 1 can be brought closer to the trigger lever 14, improving the handling of the angle fastening tool 1.

[0411] In the seventh embodiment, the spindle 8 extends downward along the rotation axis BX which is perpendicular to the front-rear direction.

[0412] In the above configuration, the lower end of the angle fastening tool 1, where the spindle 8 is located, can be positioned in front of the work area, allowing for tightening.

[0413] In the seventh embodiment, the angle fastening tool 1 comprises a hammer 47 that moves relative to the spindle 8, and an anvil 10 that is struck directly or indirectly in the rotational direction by the hammer 47. The tip tool holder 51 is positioned at the lower end of the anvil 10.

[0414] In the above configuration, even with the angle fastening tool 1, which is suitable for working in confined spaces, an impact tool is realized that can achieve high tightening torque through the impact of the hammer 47. Even when the hammer 47 is positioned on the front end of the angle fastening tool 1, the switch board 16C, motor 6, and trigger lever 14 can be brought closer together in the front-to-back direction, resulting in good weight balance and improved maneuverability.

[0415] In the seventh embodiment, the angle fastening tool 1 comprises a grip portion 22 extending in the front-rear direction, a motor housing portion 21 positioned in front of the grip portion 22, a motor 6 positioned inside the motor housing portion 21, a spindle 8 positioned in front of the motor 6 and extending in a direction intersecting the front-rear direction and rotated by the motor 6, a tip tool holder portion 51 rotated by the spindle 8, a trigger lever 14 provided on the grip portion 22, a switch board 16C on which a switch is provided, and a controller 18 connected to the motor 6, switch board 16C and trigger lever 14 via wiring. The motor 6, switch board 16C, trigger lever 14 and controller 18 are arranged in the order from front to rear.

[0416] In the above configuration, the controller 18 is positioned behind the motor 6, switch board 16C, and trigger lever 14. Since the switch board 16C is positioned near the surface of the housing, the distance between the motor 6 and the trigger lever 14 can be shortened because the controller 18 is not positioned near the switch board 16C between the motor 6 and the trigger lever 14. Because the switch board 16C, motor 6, and trigger lever 14 can be brought closer together in the front-to-back direction, the overall length of the angle fastening tool 1 can be reduced while improving the operability of the trigger lever 14 and switch operation. As a result, the operability of the angle fastening tool 1 can be improved.

[0417] In the seventh embodiment, the motor 6 has a stator 26 and a rotor 27 rotatable relative to the stator 26. The angle fastening tool 1 is positioned in front of and behind the rotor 27, respectively, and includes bearings (38F, 38R) that rotatably support the rotor 27. The front end 16F of the switch board 16C is positioned in front of the rear bearing 38R.

[0418] In the above configuration, the switch board 16C can be brought closer to the motor 6, allowing the switch board 16C, motor 6, and trigger lever 14 to be brought even closer together.

[0419] In the seventh embodiment, the front end 16F of the switch board 16C is positioned in front of the rear end of the motor 6.

[0420] In the above configuration, the switch board 16C overlaps with the motor 6 in the vertical direction. This further reduces the distance between the motor 6, the switch board 16C, and the trigger lever 14.

[0421] In the seventh embodiment, the angle fastening tool 1 includes a battery holding portion 23 connected to the rear end of the grip portion 22, which detachably holds the battery 325. With the battery 325 installed, the center of gravity CG of the angle fastening tool 1 is located between the front end 16F and the rear end 16R of the switch board 16C in the front-rear direction.

[0422] In the above configuration, the center of gravity CG of the angle fastening tool 1 is located between the front end 16F and the rear end 16R of the switch board 16C, and is also close to the trigger lever 14. In other words, since the center of gravity CG of the angle fastening tool 1 is close to the point where gripping and operation are performed, the operability of the angle fastening tool 1 is improved. In addition, it is easier to stabilize the position of the tip tool holder 51 during fastening work.

[0423] (modified version) In the above embodiment, the operation panel 16 is arranged to overlap the motor 6 vertically, but this is not the only configuration. Figure 51 is a longitudinal cross-sectional view showing a modified arrangement of the operation panel 16. Figure 51 shows a longitudinal cross-section of the battery holding section 23.

[0424] In the modified example shown in Figure 51, the control panel 16 is provided on the battery holder 23. The control panel 16 is exposed to the outside on the upper surface of the battery holder 23. The control panel 16 is located on the side of the battery holder 23 opposite to the grip portion 22. The control panel 16 is provided on the dome-shaped portion 23A of the battery holder 23. The control panel 16 is located on the rearward sloping surface of the upper surface of the upwardly bulging dome-shaped portion 23A. The operation buttons 16A and indicator display 16B of the control panel 16 are located inside the panel opening that penetrates the dome-shaped portion 23A. The switch board 16C is provided so as to close the panel opening.

[0425] The switch board 16C overlaps vertically with the controller 18, which is located inside the dome-shaped portion 23A. At least one of the front end 16F and the rear end 16R of the switch board 16C is positioned between the front end and the rear end of the controller 18. The switch board 16C and the controller 18 overlap vertically with the battery 325 held in the battery holding portion 23. [Explanation of symbols]

[0426] 1…Angle fastening tool, 1A…Angle fastening tool, 1B…Angle fastening tool, 2…Housing, 2L…First housing, 2R…Second housing, 2S…Screw, 4…Case, 4A…Case body, 4B…Lid, 4F…Case flange, 4H…Boss, 4S…Screw, 6…Motor, 7…Reduction mechanism, 8…Spindle, 8A…Flange, 8B…Spindle shaft, 8C…Spindle gear, 8D…Cylindrical part, 8F…Spindle groove, 9…Impact mechanism, 10…Anvil, 10A…Anvil shaft, 10B…Anvil projection, 10C…Anvil recess, 12…Fan 13...Battery mounting section, 14...Trigger lever, 14A...Switch body, 14B...Lower end, 15...Forward / reverse rotation switch lever, 16...Operation panel, 16A...Operation buttons, 16B...Indicator display, 16C...Switch circuit board, 16D...Switch plate, 16E...Connection terminal section, 16F...Front end, 16R...Rear end, 17...Light unit, 18...Controller, 18H...Electronic components, 19...Air intake, 20...Exhaust port, 21...Motor housing section, 21A...Rear retaining section, 21B...Panel opening, 21C...Retaining groove, 21D...Lower opening, 21E...Annular rib, 21F...Housing 21G...Support wall, 21H...Screw insertion hole, 21J...Protrusion, 21N...Narrowest part, 21P...Bottom surface, 22...Grip part, 22A...Grip, 22N...Narrowest part, 23...Battery holding part, 23A...Dome-shaped part, 25...Battery, 25A...Engaging hook, 26...Stator, 27...Rotor, 28...Stator core, 29...Front insulator, 30...Rear insulator, 31...Coil, 32...Rotor core part, 33...Rotor shaft part, 34...Rotor magnet, 35...Bevel gear, 37...Sensor board, 38F...Bearing, 38R...Bearing, 41...First reduction part, 41 A...Driven gear, 41B...First intermediate gear, 41C...First intermediate shaft, 41D...Intermediate bearing, 42...Second reduction gear, 42A...Second intermediate gear, 42B...Second intermediate shaft, 42C...Intermediate bearing, 44...Spindle bearing, 45...Washer, 46...Anvil bearing, 46A...Groove, 46B...Seal member, 47...Hammer, 47A...Hammer groove, 47B...Hammer projection, 47C...Recess, 47D...Body part, 47E...Sliding surface, 48...Ball, 49...Coil spring, 50...Ball, 51...Tip tool holder, 52...Washer, 53...Light emitter, 54...Substrate, 55...Bank56...Phosphor, 57...Optical component, 57A...Outer cylinder, 57B...Inner cylinder, 57C...Light-transmitting part, 57D...Protrusion, 58...Molded resin, 59...Cushioning member, 60...Light cover, 60S...Screw, 61...Light-emitting element holder, 61A...Peripheral wall, 61B...Locking part, 61H...Boss part, 62...Cover part, 62A...Claw part, 63...Cover recess, 65...Lead wire, 65A...First lead wire, 65B...Second lead wire, 66...Connector, 66A...Connector, 66B...Connector, 67...Ground wiring, 70...Screw, 71...Inner ring, 72...Outer ring, 73...Ball, 81...Mounting surface, 81A...Screw hole, 82...Cylinder 83...Guide projection, 84...Groove, 84A...Passage section, 84B...Grounding terminal, 85...Housing recess, 85A...Radial support surface, 85B...Front support surface, 85C...O-ring, 85D...Groove, 86...Outer cylinder section, 87...Inner cylinder section, 88...Hole, 89...Engagement hole, 91...Intermediate support member, 91A...Intermediate support member, 91B...Intermediate support member, 91C...Intermediate support member, 91D...Intermediate support member, 91E...Intermediate support member, 92...Center opening, 93...Recess, 94...Rear support surface, 101...Outer circumference section, 102...Inner circumference section, 103...Outer circumference mounting section, 104...Inner circumference mounting section, 111...Shaft, 112...Spur gear, 113F …Rotor bearing, 114…Driven gear, 115A…First intermediate gear, 115B…Second intermediate gear, 115C…Intermediate shaft, 116…Intermediate bearing, 118…Housing recess, 118A…Radial support surface, 118B…Front support surface, 119…Front housing section, 120…Rear housing section, 121…First housing chamber, 122…Second housing chamber, 135…Bevel gear, 139…Bearing, 151…Support surface, 152…Convex section, 161…Upper surface, 162…Lower surface, 163…First notch, 164…Second notch, 165…Plate section, 166A…Intermediate section, 166B…Tip section, 166…First engaging claw, 167…Second Engaging claw, 167A...intermediate part, 167B...tip part, 167C...guide surface, 168...switch label, 170...switch hole, 171...indicator hole, 172...periphery part, 173...center part, 174...pressing part, 175...top surface, 176...corner part, 201...light unit, 202...substrate, 203...optical component, 203A...side wall part, 203B...light transmitting part, 203C...protrusion part, 203D...shoulder part, 204...light cover, 205...light emitter holding part, 205A...opening, 205B...insertion hole, 206...cover part, 211...mounting surface, 211A...screw hole, 212...groove part, 213...light source placement part,214... Guide wall, 214A... Guide groove, 221... First part, 222... Second part, 223... Third part, 224... First partition wall, 225... Second partition wall, 301... Pressing surface, 301A... First end, 301B... Second end, 301C... Intermediate part, 302... Rotating shaft, 303... Rotating arm, 311... Straight line, 312... Straight line, 325... Battery, 330... Range, A... First direction, B... Second direction, CL... Gap, CL1... First clearance, CL2... Second clearance, D1... Inner diameter D2...Inner diameter, D3...Depth, D4...Thickness, FM...Fixing member, FS...Mating surface, H1...Vertical distance, H2...Vertical distance, Hs...Vertical dimension, HF1...Protrusion height, HF2...Protrusion height, HP1...Protrusion height, HP2...Protrusion height, PS1...First part, PS2...Second part, L1...Distance, L2...Distance, L3...Distance, L4...Distance, L10...Length, L11...Distance, L12...Distance, SW...Switch, W1...Width, W2...Width, W11...Width, W12...Width, WF1...Width, WF2...Width.

Claims

1. A grip section that extends in the front-to-back direction, A motor housing portion is positioned in front of the grip portion, A motor is disposed inside the motor housing, A spindle positioned in front of the motor, extending in a direction intersecting the front-rear direction, and rotated by the motor, The tip tool holder is rotated by the spindle, The trigger lever provided on the grip portion, The system includes a switch board positioned in front of the trigger lever, overlapping with the motor in the vertical direction, Angle fastening tool.

2. The switch board has a front end that overlaps with the rear of the motor in the vertical direction, and a rear end that overlaps with the front of the trigger lever in the vertical direction. An angle fastening tool according to claim 1.

3. The motor has a stator and a rotor that is rotatable relative to the stator. The rotor is further provided with bearings positioned on the front and rear sides, respectively, that rotatably support the rotor. The distance between the trigger lever and the rear bearing in the front-rear direction is smaller than the length of the switch board in the front-rear direction. An angle fastening tool according to claim 1.

4. The system further comprises a controller connected to the switch board via wiring and located behind the switch board. An angle fastening tool according to claim 1.

5. The grip portion is connected to the rear end and further comprises a battery holding portion that detachably holds the battery, The controller is located in the battery holding section. An angle fastening tool according to claim 4.

6. The distance between the trigger lever and the motor in the front-rear direction is smaller than the distance between the trigger lever and the controller in the front-rear direction. An angle fastening tool according to claim 4.

7. The switch board has an operating button, The trigger lever includes a pressing surface that is pressed when pulled, and a pivot shaft that rotates the pressing surface in conjunction with the pressing. In the front-rear direction, the distance from the center of the pivot axis to the operating button is smaller than the distance from the center of the pivot axis to the rear end of the pressing surface. An angle fastening tool according to claim 1.

8. The motor has a stator and a rotor that is rotatable relative to the stator. The switch board overlaps both the stator and the rotor in the vertical direction. An angle fastening tool according to claim 1.

9. The spindle extends downward along a rotation axis perpendicular to the front-rear direction. An angle fastening tool according to claim 1.

10. A hammer that moves relative to the spindle, The system further comprises an anvil that is struck directly or indirectly in the rotational direction by the aforementioned hammer, The tip tool holder is positioned at the lower end of the anvil. An angle fastening tool according to claim 1.

11. A housing including the grip portion and the motor housing portion, The operating panel further includes the switch board, a switch mounted on the switch board, and a switch plate attached to the switch board so as to surround at least a portion of the switch, The housing has a panel opening in which the switch plate is placed, and a retaining groove formed on the inner surface of the housing. The switch board is held in the housing by a portion of the switch board being inserted into the retaining groove. An angle fastening tool according to claim 1.

12. A grip section that extends in the front-to-back direction, A motor housing portion is positioned in front of the grip portion, A motor is disposed inside the motor housing, A spindle positioned in front of the motor, extending in a direction intersecting the front-rear direction, and rotated by the motor, The tip tool holder is rotated by the spindle, The trigger lever provided on the grip portion, A switch board with a switch installed, The motor, the switch board, and the trigger lever are connected via wiring to a controller, The motor, the switch board, the trigger lever, and the controller are arranged in that order from front to rear. Angle fastening tool.

13. The motor has a stator and a rotor that is rotatable relative to the stator. The rotor is further provided with bearings positioned on the front and rear sides, respectively, that rotatably support the rotor. The front end of the switch board is positioned in front of the rear bearing. An angle fastening tool according to claim 12.

14. The front end of the switch board is positioned in front of the rear end of the motor. An angle fastening tool according to claim 13.

15. The grip portion is connected to the rear end and further comprises a battery holding portion that detachably holds the battery, The controller is located in the battery holding section. An angle fastening tool according to claim 12.

16. The distance between the trigger lever and the motor in the front-rear direction is smaller than the distance between the trigger lever and the controller in the front-rear direction. An angle fastening tool according to claim 12.

17. The grip portion is connected to the rear end and further comprises a battery holding portion that detachably holds the battery, With the battery installed, the center of gravity is located between the front and rear ends of the switch board in the front-rear direction. An angle fastening tool according to claim 12.

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