Angled fastening tool

Abstract

The objective of the present invention is to improve the operability of an angled fastening tool. This angled fastening tool comprises: a grip portion that extends in the front-rear direction; a motor housing portion that is disposed in front of the grip portion; a motor that is disposed inside the motor housing portion; a spindle that is disposed in front of the motor, extends in a direction intersecting the front-rear direction, and is rotated by the motor; a tip tool holding portion that is rotated by the spindle; a trigger lever that is provided in the grip portion; and a switch board that is disposed in front of the trigger lever in a position overlapping the motor in the up-down direction.

Description

Angle fastening tool

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

[0002] Pistol-type electric fastening tools are known. There are also angle fastening tools that allow fastening work in narrow spaces where the tip of a pistol-type electric fastening tool cannot fit. An angle fastening tool has a motor whose rotating shaft and output shaft intersect and are not parallel. An angle fastening tool has a rod-like shape with a bent tip, and the tip can be inserted into a narrow work area to perform fastening work.

[0003] Patent No. 5844970

[0004] Angle fastening tools are rod-shaped, with the output shaft separated from the grip, and the grip and output shaft are in different directions, making them feel quite different to use compared to pistol-type electric fastening tools. Fastening operations require applying force in a direction that rotates the tip of the tool around the grip. It is desirable to improve the operability (ease of handling) of angle fastening tools.

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

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

[0007] According to the above configuration, the operability of the angle fastening tool can be improved.

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

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

[0010] In the above configuration, the switch board can be positioned closer to the motor in the front-rear direction to a position where it overlaps the motor in the vertical direction. Accordingly, the trigger lever can also be positioned near the rear of the switch board. By positioning the switch board, motor, and trigger lever closer to each other in the front-rear direction, the overall length of the angle fastening tool can be reduced while improving the operability of the trigger lever and switch. 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 the rear of the motor in the vertical direction, and a rear end that overlaps the front of the trigger lever in the vertical direction.

[0012] With the above configuration, the switch board, motor, and trigger lever can be positioned close to each other in the front-rear direction. By concentrating 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.

[0013] In one or more embodiments, the motor may have a stator and a rotor rotatable relative to the stator. The angle fastening tool may further include bearings disposed on the front and rear sides of the rotor, respectively, for rotatably supporting the rotor. A distance in the front-to-rear direction between the trigger lever and the rear bearing may be shorter than a length of the switch board in the front-to-rear direction.

[0014] With the above configuration, the trigger lever can be brought closer to the rear bearing that supports the rotation of the motor. This reduces the overall length of the angle fastening tool, and by placing the motor, a heavy component, close to the trigger lever, the center of gravity of the angle fastening tool can be brought closer to the trigger lever. This makes it easier to move the tool holder, 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 a wire and located behind the switch board.

[0016] In the above configuration, by locating the controller behind the switch board, it is not necessary to locate the controller below the switch board, which results in a reduction in the front-to-rear space below the switch board (between the motor and the trigger lever).

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

[0018] In the above configuration, the battery holder where the battery is attached can be used to secure storage space for the controller. Even if the controller is placed behind the switch board, the overall length of the angle fastening tool can be prevented from increasing.

[0019] In one or more embodiments, the distance between the trigger lever and the motor in the longitudinal direction may be smaller than the distance between the trigger lever and the controller in the longitudinal direction.

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

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

[0022] With the above configuration, the operation button can be brought sufficiently close to the trigger lever, which improves the operability of both pulling the pressure surface of the trigger lever and pressing the operation button while the operator is holding the grip portion.

[0023] In one or more embodiments, the motor may include a stator and a rotor rotatable relative to the stator, and the switch board may vertically overlap both the stator and the rotor.

[0024] With the above configuration, the switch board and the motor can be positioned closer to each other in the front-to-rear direction, thereby reducing the overall length of the angle fastening tool. The center of gravity of the angle fastening tool can be positioned closer to the trigger lever, making the angle fastening tool easier to handle.

[0025] In one or more embodiments, the spindle may extend downwardly along an axis of rotation that is perpendicular to the front-to-rear direction.

[0026] In the above configuration, the lower end of the angle fastening tool, on which the spindle is arranged, can be placed in front of the work area to perform fastening.

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

[0028] With the above configuration, an impact tool that can achieve high tightening torque by hammer impact is realized even for angle fastening tools suitable for work in tight spaces. Even when the hammer is located at the front end of the angle fastening tool, the switch board, motor, and trigger lever can be moved closer in the front-to-rear direction, resulting in good weight balance and improved maneuverability.

[0029] In one or more embodiments, the angle fastening tool may further include a housing including a grip portion and a motor housing portion, and an operation panel including 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 disposed and a retaining groove formed on an inner surface of the housing. The switch board may be retained in the housing by inserting a portion of the switch board into the retaining groove.

[0030] In the above configuration, the switch board, which is subject to external force when the switch is operated, can be directly held by the housing. However, if the switch plate were held by the housing, the switch board and switch plate would need to be firmly fixed with screws or other fasteners to withstand the external force, and then the switch plate would be fixed to the housing, resulting in a larger structure around the switch. In contrast, in the above configuration, the external force acting on the switch board is supported by the housing, so the switch plate does not need to support the external force, and the fixing of the switch plate can be simplified. This allows for a simpler and more compact structure around the switch.

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

[0032] In the above configuration, the controller is located behind the motor, switch board, and trigger lever. Because the switch board is located near the surface of the housing, the controller is not located near the switch board between the motor and trigger lever, thereby shortening the distance between the motor and trigger lever. Because the switch board, motor, and trigger lever can be located closer to each other in the front-to-rear direction, the operability of the trigger lever and switch can be improved while reducing the overall length of the angle fastening tool. 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. The angle fastening tool may further include bearings disposed on the front and rear sides of the rotor, respectively, to rotatably support the rotor. The front end of the switch board may be disposed forward of the rear bearing.

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

[0035] In one or more embodiments, the forward end of the switch board may be located forward of the rear end of the motor.

[0036] In the above configuration, the switch board overlaps the motor in the vertical direction, which 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 a rear end of the grip portion and configured to detachably hold a battery. The controller may be disposed in the battery holder.

[0038] In the above configuration, the battery holder where the battery is attached can be used to secure storage space for the controller. Compared to storing the controller inside the grip, the external dimensions (circumferential length) of the grip are not increased, making the grip easier to hold. As a result, the handleability of the angle fastening tool is improved.

[0039] In one or more embodiments, the distance between the trigger lever and the motor in the longitudinal direction may be smaller than the distance between the trigger lever and the controller in the longitudinal direction.

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

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

[0042] In the above configuration, the center of gravity of the angle fastening tool is located between the front end and rear end of the switch board and is also close to the trigger lever. In other words, the center of gravity of the angle fastening tool is located close to the area where it is gripped and operated, improving the operability of the angle fastening tool. In addition, the position of the tool tip holder can be easily stabilized during fastening work.

[0043] [Additional Notes] In one or more embodiments, the configuration may include the following features: [Feature 1] An electric operating machine comprising: a housing; and an operation panel including 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, wherein the housing has a panel opening in which the switch plate is disposed and a retaining groove formed on an inner surface of the housing, and the switch board is retained in the housing by inserting a portion of the switch board into the retaining groove.

[0044] [Feature 2] In the electric operating machine described in Feature 1, the housing is configured by joining together a first housing including the panel opening and a first portion of the retaining groove and a second housing including the panel opening and a second portion of the retaining groove, and the retaining groove is provided on at least one of one end side and the other end side of the switch board on the mating surfaces of the first housing and the second housing, and extends in a first direction perpendicular to the mating surfaces.

[0045] [Feature 3] In the electric operating machine according to Feature 2, the holding groove is provided on both one end side and the other end side of the switch board.

[0046] [Feature 4] In the electric operating machine described in Feature 2, the first portion of the retaining groove has a first clearance between itself and the switch board in a second direction connecting one end and the other end of the switch board in a cross section along the mating surface, and the second portion of the retaining groove has a second clearance between itself and the switch board in the second direction, the second clearance being larger than the first clearance.

[0047] [Feature 5] In the electric operating machine described in Feature 2, at least one of the first housing and the second housing has a support surface that supports the switch board, located adjacent to the switch board on the opposite side from the panel opening, and the support surface is provided at a position that contacts an edge of the switch board in the first direction.

[0048] [Feature 6] In the electric operating machine according to Feature 5, both the first housing and the second housing have the support surface.

[0049] [Feature 7] In the electric operating machine according to Feature 5, the holding groove has a convex portion that protrudes toward a surface of the switch board on which the switch is mounted, and the convex portion is in close contact with the surface of the switch board while undergoing elastic deformation.

[0050] [Feature 8] In the electric operating machine according to Feature 1, the switch plate has a plate portion and a first engagement claw and a second engagement claw that are provided at opposing positions on the outer periphery of the plate portion and that engage with the switch board, respectively.

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

[0052] [Feature 10] In the electric operating machine according to Feature 9, the width of the first engagement claw is greater than the width of the second engagement claw.

[0053] [Feature 11] In the electric operating machine according to Feature 9, the first engagement claw protrudes from the plate portion by a smaller height than the second engagement claw protrudes from the plate portion.

[0054] [Feature 12] In the electric operating machine described in Feature 8, a first notch in which a part of the first engagement claw is disposed and a second notch in which a part of the second engagement claw is disposed are formed on the outer periphery of the switch board.

[0055] [Feature 13] In the electric operating machine according to Feature 1, the switch plate has a plate portion having a thickness greater than that of the switch, and a switch label provided on a surface of the plate portion and covering the switch, and the switch label has a convex cross-sectional shape including a top surface and corner portions.

[0056] [Feature 14] In the electric operating machine described in Feature 13, the plate portion has a central portion recessed relative to a peripheral edge portion, the switch label is disposed in the central portion of the plate portion, and a protruding height of the peripheral edge portion from the switch board is greater than a protruding height of the top surface of the switch label from the switch board.

[0057] The electric working machine according to the configurations of Features 1 to 14 may be an electric fastening tool other than an angle fastening tool, or may be an electric tool other than an electric fastening tool. The electric working machine may be something other than an electric tool.

[0058] Hereinafter, embodiments will be described with reference to the drawings. In the embodiments, the positional relationship of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate relative positions or directions based on the center of the angle fastening tool.

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

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

[0061] In this embodiment, the angle fastening tool 1 is an angle impact wrench. The angle fastening tool 1 includes a housing 2, a case 4, a motor 6, a speed reducer 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 rotation switch lever 15, an operation panel 16, a light unit 17, and a controller 18.

[0062] The housing 2 is made of synthetic resin and is composed of a pair of left and right half housings which are fixed together by a plurality of screws 2S.

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

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

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

[0066] As shown in FIG. 2 , the circumferential length of the narrowest part 22N of the grip portion 22 is smaller than the circumferential length of the narrowest part 21N of the motor housing portion 21. The circumferential length 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 shown in FIG. 3 , the narrowest part 22N of the grip portion 22 is the rear end of the grip portion 22 (the connection portion with the battery holding portion 23), and the circumferential length of the grip portion 22 is, for example, 115 mm. The circumferential length 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 shown in FIG. 3 , the circumferential length of the narrowest part 21N of the motor housing portion 21 is 200 mm.

[0067] The battery holding portion 23 is connected to the rear end of the grip portion 22. The battery holding portion 23 houses the controller 18. The battery holding portion 23 holds a battery 25. The battery 25 is attached to the battery attachment portion 13 provided on the underside of the battery holding portion 23.

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

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

[0070] The case 4 is connected to the front of the motor housing portion 21. The motor housing portion 21 is fixed to the rear of the case 4. A housing flange portion 21F is provided at the front end of the motor housing portion 21. A case flange portion 4F on which a plurality of bosses 4H are formed is provided at the rear end of the case 4. Screws 70 pass through screw insertion holes in the housing flange portion 21F and are coupled to the bosses 4H, thereby fixing the case 4 and the motor housing portion 21 together.

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

[0072] The case 4 includes a case body 4A and a lid portion 4B. The case body 4A is hollow and box-shaped, with openings at the rear and top. The rear surface of the case body 4A is connected to and covered by the motor housing portion 21 of the housing 2. The top surface of the case body 4A is covered by the lid portion 4B. The lid portion 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 with screws 4S. The case 4 accommodates the reduction mechanism 7, spindle 8, striking mechanism 9, and anvil 10, which are assembled through the top opening of the case body 4A, by attaching the lid portion 4B to the case body 4A.

[0073] The case 4 has a front surface, left and right side surfaces, and a bottom surface that are formed by the case main body 4A. As shown in FIG. 7 , the bottom surface of the case 4 has a flat mounting surface 81 and a tubular portion 82 that protrudes downward from the mounting surface 81. The mounting surface 81 is a surface that extends in the front-rear and left-right directions. The mounting surface 81 connects the front surface and left and right side surfaces of the case main body 4A to the tubular portion 82. A light unit 17 and a light cover 60 are disposed on the mounting surface 81. The mounting surface 81 is covered by the light cover 60. The tubular portion 82 is located near the front surface of the bottom surface of the case 4. The tubular portion 82 has a cylindrical shape. An internal opening of the tubular portion 82 communicates with the interior of the case 4. The anvil 10 passes through the tubular portion 82. The anvil 10 protrudes downward from the interior of the case 4 through the tubular portion 82.

[0074] The case 4 holds a bearing 38F that rotatably supports the rotor 27 of the motor 6. The speed reduction mechanism 7 is disposed in front of the bearing 38F. The spindle 8 and the impact mechanism 9 are disposed in front of the speed reduction mechanism 7. The anvil 10 is disposed below the impact mechanism 9.

[0075] The motor 6 is a power source of the angle fastening tool 1. The motor 6 generates rotational force. The motor 6 is an electric motor. The motor 6 is an inner rotor type brushless motor. The motor 6 is accommodated in the motor housing portion 21 of the housing 2. The motor 6 is disposed inside the motor housing portion 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 portion 21. At least a portion of the rotor 27 is disposed inside the stator 26. The rotor 27 rotates relative to the stator 26. The rotor 27 rotates about 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 disposed radially outward of the rotor 27. The stator core 28 includes a plurality of stacked steel plates. The steel plates are metal plates whose main component is iron. The stator core 28 is cylindrical. The stator core 28 has a plurality of teeth that support the coils 31.

[0079] The front insulator 29 is provided in the front portion of the stator core 28. The rear insulator 30 is provided in the rear portion of the stator core 28. The front insulator 29 and the rear insulator 30 are each an electrical insulating member made of synthetic resin. The front insulator 29 is arranged to cover a portion of the surface of the teeth. The rear insulator 30 is arranged to cover a portion of the surface of the teeth.

[0080] The coils 31 are attached to the stator core 28 via the front insulators 29 and the rear insulators 30. A plurality of coils 31 are arranged. The coils 31 are arranged around the teeth of the stator core 28 via the front insulators 29 and the rear insulators 30. The coils 31 and the stator core 28 are electrically insulated by the front insulators 29 and the rear insulators 30.

[0081] The rotor 27 rotates about a rotation axis AX and includes a rotor core 32, a rotor shaft 33, and a rotor magnet .

[0082] The rotor core portion 32 and the rotor shaft portion 33 are each made of steel. In the embodiment, the rotor core portion 32 and the rotor shaft portion 33 are separate bodies. Alternatively, the rotor core portion 32 and the rotor shaft portion 33 may be integrally formed. A front portion of the rotor shaft portion 33 protrudes forward from the front end surface of the rotor core portion 32. A 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 portion 32. The rotor magnet 34 extends in the front-rear direction so as to penetrate the rotor core portion 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 magnetic force of the rotor magnet 34 to detect the position of the rotor 27 in the rotational direction.

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

[0086] A bevel gear 35 is provided at the front end of the rotor shaft 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 7. The rotor shaft 33 is connected to the reduction mechanism 7 via the bevel gear 35.

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

[0088] The speed reduction mechanism 7 is composed of multiple speed reduction sections. The speed reduction mechanism 7 includes a first speed reduction section 41 and a second speed reduction section 42. The first speed reduction section 41 is connected to the pinion gear and rotates by slowing down the rotation of the pinion gear. The second speed reduction section 42 slows down the rotation of the first speed reduction section 41 and transmits it to the spindle 8.

[0089] The first reduction gear unit 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 in a vertical direction perpendicular to the rotation axis AX and rotates around a vertical central axis. 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 integral with each other. The first intermediate gear 41B and the first intermediate shaft 41C may be separate bodies. The driven gear 41A is attached to the lower part of the first intermediate shaft 41C, and the first intermediate gear 41B is attached to 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 integrally. The driven gear 41A is a bevel gear that meshes with the bevel gear 35, which is a pinion gear. 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 gear unit 42.

[0090] The second reduction gear unit 42 is disposed in front of the first reduction gear unit 41. The second reduction gear unit 42 includes 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 in a vertical direction perpendicular to the rotation axis AX and rotates around a vertical central axis. The first intermediate shaft 41C and the second intermediate shaft 42B are parallel to each other. 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. A second intermediate gear 42A is fixed to the second intermediate shaft 42B. The second intermediate gear 42A is attached to an upper portion of the second intermediate shaft 42B. The second intermediate gear 42A and the second intermediate shaft 42B rotate integrally. 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 at a reduced speed compared to the rotation 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 33 is rotated by the drive of the motor 6, the bevel gear 35 rotates, and the bevel gear 35 rotates the driven gear 41A. The rotation of the driven gear 41A causes the first intermediate shaft 41C to rotate at a rotational speed lower than the rotational speed of the rotor shaft 33. The rotation of the first intermediate shaft 41C causes the first intermediate gear 41B to rotate, and the first intermediate gear 41B rotates the second intermediate gear 42A. The rotation of the second intermediate gear 42A causes the second intermediate gear 42A to rotate 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. The rotation of the spindle gear 8C causes the spindle 8 to rotate. The spindle 8 rotates at a rotational speed lower than the rotational speed of the rotor shaft portion 33 .

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

[0093] The spindle 8 extends in a direction intersecting the front-rear direction. The spindle 8 extends downward along a rotation axis BX that 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 with each other. The direction of the rotation axis BX of the spindle 8 may intersect with the front-rear direction (i.e., the rotation axis AX) at an angle between 80 degrees and 100 degrees. In this embodiment, the spindle 8, the hammer 47, and the 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 periphery 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 disposed on the outer periphery of the cylindrical portion 8D. The spindle bearing 44 rotatably supports the outer periphery of the cylindrical portion 8D. The spindle bearing 44 is a plain bearing. A cylindrical protrusion that protrudes downward is provided at the lower end of the spindle shaft portion 8B. The protrusion is disposed in an anvil recess 10C formed in the upper surface of the anvil 10. The lower part of the spindle 8 is rotatably supported by the 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 mechanism 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 rotated by the motor 6. As shown in FIGS. 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 disposed between the spindle 8 and the anvil 10 in the case 4. The striking mechanism 9 is disposed below the flange portion 8A of the spindle 8.

[0097] The hammer 47 is disposed forward of the reduction mechanism 7. The hammer 47 is housed in the case 4. The hammer 47 is rotated by the spindle 8. The hammer 47 is disposed around the spindle shaft 8B. The hammer 47 is held by the spindle shaft 8B. The ball 48 is disposed between the spindle shaft 8B and the hammer 47. The coil spring 49 is supported by each of the flange 8A and the hammer 47.

[0098] The hammer 47 has a body portion 47D, a hammer groove 47A, and a hammer protrusion 47B (see FIG. 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 portion of the body portion 47D. The recess 47C is recessed forward from the rear end of the body portion 47D. The recess 47C is ring-shaped. The hammer protrusion 47B protrudes forward from the body portion 47D. Two hammer protrusions 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 mechanism 7 and the spindle 8. The hammer 47 can rotate together with the spindle 8 based on the rotational force of the spindle 8 rotated by the motor 6. The rotation axis of the hammer 47 coincides with the rotation axis BX of the spindle 8. The hammer 47 rotates around the rotation axis BX. The hammer 47 moves relative to the spindle 8. The hammer 47 moves vertically relative to the spindle 8.

[0100] The ball 48 is made of a metal such as steel. The ball 48 is disposed 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 disposed. 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 disposed. The hammer groove 47A is provided on a portion of the inner surface of the body portion 47D. The ball 48 is disposed 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. 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 a movable range 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 disposed between the flange portion 8A and the hammer 47. The lower portion of the coil spring 49 is disposed in a ring-shaped recess 47C provided on the rear surface of the hammer 47. A washer 45 is disposed inside the recess 47C. The washer 45 is supported by the body portion 47D via a ball 50. The upper end portion of the coil spring 49 is supported by the flange portion 8A. The lower end portion of the coil spring 49 is supported by the washer 45. The hammer 47 and the coil spring 49 are capable of relative rotation around the rotation axis BX due to the presence of the washer 45 and the ball 50.

[0102] The anvil 10 is an output part 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 disposed below the hammer 47. The anvil 10 is struck directly or indirectly by the hammer 47 in the rotational direction. 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 protrusion portion 10B. An anvil recess 10C is provided at the upper end of the anvil 10 to receive the protrusion portion of the spindle shaft portion 8B. The anvil protrusion portion 10B is provided at the upper end of the anvil 10. The anvil protrusion 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 tool holder 51 is disposed at the lower end of the anvil 10. The tool holder 51 protrudes downward from the underside of the case 4. The tool holder 51 is provided at the exposed portion of the lower end of the anvil shaft portion 10A. The tool holder 51 is rotated by the spindle 8. The tool holder 51 is rotated by the spindle 8 via the hammer 47 and the anvil 10 .

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

[0105] The anvil 10 is rotatably supported by an anvil bearing 46 (see FIG. 7 ). The rotation axis of the anvil 10 coincides with the rotation axis BX of the spindle 8. The anvil 10 rotates around the rotation axis BX. The anvil bearing 46 is disposed inside the cylindrical portion 82. The anvil bearing 46 is disposed inside the cylindrical portion 82 of the case 4. The anvil bearing 46 is held in the cylindrical portion 82. The cylindrical portion 82 is disposed 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 plain bearing. A ring-shaped groove 46A is provided in the anvil shaft portion 10A, facing the anvil bearing 46. A ring-shaped seal member 46B is disposed in the groove 46A. A washer 52 is provided on the inner bottom surface of the case 4. The washer 52 faces the anvil protrusion 10B.

[0106] The hammer protrusion 47B can come into contact with the anvil protrusion 10B. When the motor 6 is driven while the hammer protrusion 47B and the anvil protrusion 10B are in contact with each other, 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, during a screw tightening operation, if the load acting on the anvil 10 becomes too high, a situation may arise in which the anvil 10 cannot be rotated by the power generated by the motor 6 alone. When the power generated by the motor 6 alone is no longer sufficient to rotate the anvil 10, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 are capable of relative movement in the axial and circumferential directions via the ball 48. Even when the rotation of the hammer 47 stops, the rotation of the spindle 8 continues by the power generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the ball 48 moves upward while being guided by the spindle groove 8F and the hammer groove 47A. 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 when the spindle 8 rotates while the rotation of the anvil 10 is stopped. As the hammer 47 moves upward, the contact between the hammer protrusion 47B and the anvil protrusion 10B is released.

[0108] The coil spring 49 generates an elastic force that moves the hammer 47 downward. After moving upward, the hammer 47 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 protrusion 47B comes into contact with the anvil protrusion 10B while rotating. As a result, the anvil protrusion 10B is struck in the rotational direction by the hammer protrusion 47B. Both the power of the motor 6 and the inertial force of the hammer 47 act on the anvil 10. 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 FIG. 5 , the fan 12 is disposed forward of the stator 26 of the motor 6. The fan 12 generates an airflow for cooling 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 portion of the rotor shaft 33. The fan 12 is disposed between the bearing 38F and the stator 26. The fan 12 rotates due to the rotation of the rotor 27. As the rotor shaft 33 rotates, the fan 12 rotates together with the rotor shaft 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 air intake 19. The air that has flowed into the internal space of the housing 2 circulates through the internal space of the housing 2, thereby cooling the motor 6. 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 air exhaust 20.

[0110] 1 and 5, the operation panel 16 is provided in the motor housing portion 21. The operation panel 16 is exposed to the outside through a panel opening 21B formed in the top surface of the motor housing portion 21. The operation panel 16 is disposed near the boundary between the rear of the motor housing portion 21 and the grip portion 22. The operation panel 16 is disposed forward of the trigger lever 14. At least a portion of the operation panel 16 vertically overlaps with the motor 6. At least a portion of the operation panel 16 vertically overlaps with the bearing 38R.

[0111] FIG. 8 is a perspective view showing the operation panel 16 according to the embodiment. FIG. 8 shows a state in which a right side part of the housing 2 has been removed, exposing a portion of the operation panel 16. The operation panel 16 is plate-shaped. The operation panel 16 has operation buttons 16A, an indicator display 16B, and a switch board 16C. A switch plate 16D fits into the panel opening 21B. The switch board 16C has a flat plate shape. The switch board 16C is provided with switches. The switches are, for example, the operation buttons 16A, but may be switches other than buttons, such as dip switches, rocker switches, or rotary switches. Specifically, the switch board 16C is a circuit board on which the operation buttons 16A and the indicator display 16B are provided. The switch board 16C is connected to the controller 18 via wiring. The motor housing portion 21 has a retaining groove 21C directly below the panel opening 21B, which supports the outer periphery of the switch board 16C. The operation panel 16 is held in the motor housing 21 by fitting the outer periphery of the switch board 16C into the holding groove 21C. The switch board 16C is disposed in the upper part of the motor housing 21 and fits along the upper surface of the motor housing 21. The operation panel 16 outputs a signal according to input from the operation button 16A to the controller 18, and displays information on the indicator display 16B according to the signal from the controller 18.

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

[0113] FIG. 9 is a schematic diagram showing the attachment of a battery 25 to the battery holding portion 23 according to the embodiment. FIG. 9 shows a state in which the right side part of the housing 2 has been removed to expose the interior of the battery holding portion 23. As shown in FIGS. 4 and 9 , the battery attachment portion 13 is disposed below the battery holding portion 23. The battery 25 is attached to the battery attachment portion 13. The battery 25 is detachable from the battery attachment portion 13. The battery attachment portion 13 holds the battery 25 so that it can slide forward and backward. When the battery 25 slides forward from the rear of the battery attachment portion 13 and reaches the engagement position, the battery attachment portion 13 engages with the engagement hook 25A of the battery 25 to restrict 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 attachment portion 13. This allows the battery 25 to be attached or detached.

[0114] The battery 25 functions as a power source for the angle fastening tool 1. The battery 25 includes a secondary battery. In this embodiment, the battery 25 includes a rechargeable lithium-ion battery. When attached to the battery attachment portion 13, the battery 25 can supply power to the angle fastening tool 1. The motor 6 and the light unit 17 are each driven by 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, the switch board 16C, and the trigger lever 14 via wiring. The controller 18 is connected to the battery 25 via wiring. The wiring passes through the inside of the grip portion 22.

[0116] The controller 18 outputs a control signal for controlling the motor 6. The controller 18 includes a circuit board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit board include a processor such as a central processing unit (CPU), a non-volatile memory such as a read-only memory (ROM) or storage, a volatile memory such as a random access memory (RAM), a field effect transistor (FET), and a resistor. The controller 18 sets the operation mode of the angle fastening tool 1 based on the operation of the operation panel 16. Setting parameters for the operation 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 operation mode.

[0117] The controller 18 is arranged rearward of the switch board 16C. The controller 18 is arranged rearward of the trigger lever 14. The controller 18 is arranged in the battery holding portion 23. The controller 18 is arranged above the battery attachment portion 13. The controller 18 is aligned in the front-to-rear and left-to-right directions. The controller 18 is arranged so as to overlap the upper surface of the battery attachment portion 13. The battery holding portion 23 has a dome-shaped outer shape in which a storage space for the controller 18 is formed.

[0118] As shown in FIG. 4 , the trigger lever 14 is provided on the grip portion 22. The trigger lever 14 is provided on the front portion of the grip portion 22. The trigger lever 14 is provided so as to protrude downward from the underside of the grip portion 22. The trigger lever 14 is operated by an operator to start the motor 6. A switch body 14A is disposed on top of the trigger lever 14. The switch body 14A is disposed inside the grip portion 22. The switch body 14A is operated by operating the trigger lever 14. The operation of the switch body 14A generates a trigger signal. The controller 18 switches between driving and stopping the motor 6 based on the trigger signal.

[0119] As shown in FIG. 2 , the lower end 14B of the trigger lever 14 is positioned higher than the lower end of the tool holder 51 in the vertical direction. The lower end 14B of the trigger lever 14 is positioned higher than the underside of the battery 25. The lower end 14B of the trigger lever 14 is positioned between the lower end of the tool holder 51 and the underside 21P of the motor housing 21 in the vertical direction. The lower end 14B of the trigger lever 14 is positioned closer to the underside 21P of the motor housing 21 than 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 underside 21P of the motor housing 21 is shorter 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 higher than the underside 21P of the motor housing 21.

[0120] The forward / reverse switching lever 15 is provided on the grip portion 22. The forward / reverse switching lever 15 is disposed above the trigger lever 14 on the left and right side surfaces of the grip portion 22. The forward / reverse switching lever 15 is operated by an operator. By operating the forward / reverse switching lever 15, the rotation direction of the motor 6 is switched from one of the forward direction and the reverse direction to the other. By switching the rotation direction of the motor 6, 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 the area around the anvil 10 with the illumination light. The light unit 17 includes one or more light emitters 53. The light unit 17 includes chip-on-board light emitting diodes (COB LEDs).

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

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

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

[0125] The front end 16F of the switch board 16C is located forward of the rear bearing 38R. The front end 16F of the switch board 16C is located forward 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 located forward of the rear surface of the stator core 28, and is located forward of the rear surface of the rotor core portion 32.

[0126] The rear end 16R of the switch board 16C overlaps in the up-down direction with the front portion of the trigger lever 14. The rear end 16R of the switch board 16C is located at the same position in the front-to-back direction as the front portion of the trigger lever 14, but is offset in the up-down direction from the trigger lever 14. The rear end 16R of the switch board 16C is located rearward of the front surface of the trigger lever 14. The rear end 16R of the switch board 16C is located rearward of the bearing 38R.

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

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

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

[0130] The light emitting body 53 is held in the case 4. The light emitting body 53 is held on the underside of the case 4. A plurality of light emitting bodies 53 are provided around the anvil 10. The plurality of light emitting bodies 53 are arranged along the circumferential direction of the anvil 10. The plurality of light emitting bodies 53 are arranged in the rotational direction around the anvil 10. The light emitting body 53 is arranged around at least a portion of the circumference of the anvil shaft portion 10A. The plurality of light emitting bodies 53 are lined up along the rotational direction of the anvil 10. The light emitting body 53 is mounted on the underside of the substrate 54.

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

[0132] The substrate 54 has an annular shape that surrounds the periphery of the cylindrical portion 82. A plurality of the light emitters 53 are arranged at intervals in the circumferential direction of the substrate 54. The number of the light emitters 53 is not limited as long as there is more than one. In the embodiment, 12 light emitters 53 are arranged at equal intervals in the circumferential direction of the cylindrical portion 82 (see FIG. 11 ).

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

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

[0135] The optical member 57 is disposed so as to cover the front sides of the plurality of light-emitting bodies 53. At least a portion of the optical member 57 is disposed forward of the light unit 17. The optical member 57 is continuous so as to straddle the plurality of light-emitting bodies 53. The optical member 57 is formed in a ring shape that surrounds the anvil 10 so as to cover the plurality of light-emitting bodies 53. The optical member 57 is annular. The optical member 57 has an outer cylinder portion 57A, an inner cylinder portion 57B, a light-transmitting portion 57C, and a convex portion 57D.

[0136] As shown in FIG. 10 , the outer tube portion 57A is disposed radially outward of the inner tube portion 57B. In the radial direction, the plurality of light emitters 53 are disposed between the outer tube portion 57A and the inner tube portion 57B. The inner tube portion 57B is disposed radially outward of the cylindrical portion 82 of the case 4. The light transmitting portion 57C is disposed below the plurality of light emitters 53. The light transmitting portion 57C is annular. The light transmitting portion 57C is disposed so as to connect the front end of the outer tube portion 57A and the front end of the inner tube portion 57B. The light transmitting portion 57C faces the lower surface of the substrate 54. The light transmitting portion 57C faces the light emitters 53. Light emitted from the light emitters 53 passes through the light transmitting portion 57C and is irradiated downward of the light unit 17. The lower surface of the light transmitting portion 57C forms the light emission surface of the light unit 17.

[0137] The protrusion 57D is disposed rearward of the light transmitting portion 57C. The protrusion 57D is provided so as to protrude rearward from the rear portion of the outer cylinder portion 57A. The protrusion 57D is disposed between a pair of guide protrusions 83 (see FIGS. 14 and 15 ) of the case 4, and functions as a positioning portion for the light unit 17 in the rotational direction.

[0138] 10 , the upper surface of the substrate 54 is located below the upper ends of the outer tube portion 57A and the inner tube portion 57B. The substrate 54 and the plurality of light emitters 53 are located in a concave storage space defined by the outer tube portion 57A, the inner tube portion 57B, and the light-transmitting portion 57C of the optical member 57. The upper surface of the storage space is open. A molded resin 58 is filled into the storage space. The molded resin 58 fixes the plurality of light emitters 53 and the substrate 54 to the optical member 57 and to some of the lead wires 65.

[0139] The case 4 holds the light unit 17. The light unit 17, which includes a plurality of light emitters 53, is held on the underside of the case 4. The angle fastening tool 1 includes a light cover 60 that is disposed on the underside of the case 4, holds the light emitters 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 portion 21. The light cover 60 is separate from the case 4. The light cover 60 engages with the motor housing portion 21. The light cover 60 is attached to the underside of the case 4. The light cover 60 holds the light unit 17 on the underside of the case 4. The light unit 17 is held between the underside 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 an illuminant holder 61 and a cover portion 62. The light cover 60 is a single member in which the illuminant holder 61 and the cover portion 62 are integrally formed. The illuminant holder 61 is separate from the motor housing portion 21. The cover portion 62 is separate from the motor housing portion 21. The illuminant holder 61 is separate from the case 4. The cover portion 62 is separate from the case 4.

[0142] The light-emitting body holding portion 61 is disposed on the underside of the case 4 and holds the plurality of light-emitting bodies 53. The light-emitting body holding portion 61 and the light-emitting bodies 53 are disposed on the mounting surface 81. The light-emitting body holding portion 61 is provided circumferentially along the outer periphery of the optical member 57. The light-emitting body holding portion 61 is ring-shaped and surrounds the outer periphery of the optical member 57. The light-emitting body holding portion 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 in the vertical direction from the mounting surface 81 of the case 4 to the lower surface of the optical member 57. The light-emitting body holding portion 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 around the entire inner periphery 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 locally contacts the outer peripheral edge of the lower surface of the optical member 57 so as to catch on it. The locking portion 61B is located on the lower surface of the optical member 57, more outer peripherally than the light emitter 53. The light emitter holding portion 61 supports the lower surface of the optical member 57 at the locking portion 61B. As described above, the light unit 17, which includes the optical member 57, the light emitter 53, and the substrate 54, is integrated by the molded resin 58. Therefore, the light emitter holding portion 61 supports the entire light unit 17, including the light emitter 53, from below by supporting the lower surface of the optical member 57. The light emitter holding portion 61 exposes the lower surface of the optical member 57, at a position directly below the light emitter 53 and at a position more inner than the light emitter 53.

[0143] The light emitter holding portion 61 is fixed to the underside of the case 4 by screws 60S, which tighten the light emitter holding portion 61 toward the underside of the case 4. The light emitter holding portion 61 holds the multiple light emitters 53 by pressing the underside of the optical member 57 toward the case 4 with the locking portion 61B. The light emitter holding portion 61 presses the outer peripheral edge of the underside of the optical member 57.

[0144] The light emitter holding portion 61 is fixed to the underside of the case 4 at multiple locations around the optical member 57 with screws 60S. The light emitter holding portion 61 is fixed with four screws 60S at the four corner positions of the underside of the case 4. Screw holes 81A are formed in a flat mounting surface 81 of the underside of the case 4. The screw holes 81A are arranged at the four corner positions surrounding the periphery of the cylindrical portion 82. In other words, the four screw holes 81A are arranged at approximately 90-degree intervals in the rotational direction of the cylindrical portion 82. The peripheral wall portion 61A has boss portions 61H to which the screws 60S are attached. The boss portions 61H are arranged at the four corner positions surrounding the periphery of the cylindrical portion 82, corresponding to the screw holes 81A in the mounting surface 81. The boss portions 61H have insertion holes formed therein through which the screws 60S pass. The screws 60S pass through the insertion holes of the boss portions 61H from below and are fixed to the screw holes 81A. The axial force of the screw 60S causes the light emitter holding portion 61 to press the optical member 57 upward toward the mounting surface 81 from the four corner positions around the optical member 57.

[0145] As shown in Figure 10, the angle fastening tool 1 further includes a buffer member 59 disposed between the light emitter 53 and the lower surface of the case 4. The buffer member 59 is disposed above the light unit 17. The buffer member 59 is an elastic member, such as a rubber material. The buffer member 59 protects the substrate 54 and the optical member 57 from contact with the case 4, which is a metallic vibrating body. The buffer member 59 covers at least a portion of the upper surface of the light unit 17. The buffer member 59 allows the light unit 17 to be held between the mounting surface 81 of the case 4 and the light emitter holder 61 while being spaced apart from the mounting surface 81.

[0146] The buffer member 59 is ring-shaped. The buffer member 59 overlaps with the light unit 17 around the entire circumference. The buffer member 59 is held in an elastically deformed state by being sandwiched between the light unit 17 and the mounting surface 81. The buffer member 59 is crushed by the light unit 17 by the axial force of the screw 60S. The buffer member 59 deforms to fit 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 buffer member 59 contacts the mounting surface 81 and the cylindrical portion 82. The lower surface of the buffer member 59 contacts the light unit 17.

[0147] As shown in FIGS. 12 and 13 , the cover portion 62 covers the lead wires 65. The lead wires 65 extend from the motor housing portion 21. The lead wires 65 are connected to the plurality of light emitters 53. In other words, the lead wires 65 extend from the light unit 17 to the motor housing portion 21 along the underside of the case 4. The lead wires 65 connect the plurality of light emitters 53 to the controller 18. The lead wires 65 (see FIG. 4 ) pass from the controller 18 through the battery holding portion 23 and the interior of the motor housing portion 21, and extend from the lower opening 21D on the front surface of the motor housing portion 21 to the underside of the case 4. The lead wires 65 extend forward along the underside of the case 4 and connect to the circuit board 54 of the light unit 17. As a result, the lead wires 65 connect to the plurality of light emitters 53 on the circuit board 54 to supply power.

[0148] As shown in FIG. 15 , the lead wire 65 includes a first lead wire 65A extending from the motor housing portion 21 and a second lead wire 65B connected to the first lead wire 65A via a connector 66 and connected to the plurality of light emitters 53. The first lead wire 65A extends forward from the interior of the motor housing portion 21 through a lower opening 21D of the motor housing portion 21 and extends to the underside of the case 4. A connector 66A is provided on one side of the first lead wire 65A. The second lead wire 65B extends rearward from the board 54 of the light unit 17 along the underside of the case 4. A connector 66B is provided on the other side of the second lead wire 65B. The connector 66A of the first lead wire 65A and the connector 66B of the second lead wire 65B are connected to each other, thereby establishing electrical continuity between the first lead wire 65A and the second lead wire 65B. The connectors 66A and 66B are detachable by insertion and removal. When the connector 66B is separated from the connector 66A, the subassembly consisting of the light unit 17, the second lead wire 65B, and the connector 66B can be separated from the angle fastening tool 1.

[0149] 14 and 15 , the case 4 has a groove 84 on the underside of the case 4 in which the lead wire 65 is disposed. The groove 84 is a concave portion recessed upward from the underside of the case 4. The groove 84 is provided on the underside of the case 4 in the front-to-rear direction, ranging 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 disposed in the groove 84. The connector 66A of the first lead wire 65A and the connector 66B of the second lead wire 65B are coupled in the groove 84.

[0150] The angle fastening tool 1 includes a ground wire 67 that extends from the motor housing portion 21 and connects to the underside of the case 4. The ground wire 67 is connected to a ground terminal 84B provided on the underside of the case 4. The ground terminal 84B is disposed in the groove portion 84. The ground wire 67 passes from the lower opening 21D of the motor housing portion 21 through the groove portion 84 and connects to the ground terminal 84B. The lead wire 65 and the ground wire 67 are disposed in the same groove portion 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 the ground wire 67 extending from the lower opening 21D (see FIG. 13) of the motor housing 21 pass through the passage 84A. The passage 84A makes it possible to determine the starting positions of the lead wires 65 and the ground wire 67 on the underside of the case 4 at the position of the passage 84A, and also makes it possible to bundle multiple wires together.

[0152] The cover portion 62 covers the lead wires 65 and the earth wire 67. The cover portion 62 covers the groove portion 84 in which the lead wires 65 are arranged. The cover portion 62 covers the earth wire 67 and the ground terminal 84B. The cover portion 62 extends from the arrangement position of the multiple light emitters 53 to the motor housing portion 21 on the underside of the case 4. Specifically, the cover portion 62 extends rearward from the rear end portion of the light emitter 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] 16 , the cover part 62 has a cover recess 63 recessed downward from the upper surface side, opposite to the groove part 84. A space for accommodating wiring, which is constituted by the groove part 84 and the cover recess 63, is formed between the lower surface of the case 4 and the cover part 62.

[0154] The cover portion 62 has claw portions 62A that engage with the motor housing portion 21. The claw portions 62A are disposed at the rear end of the cover portion 62. The claw portions 62A protrude rearward from the rear end of the cover portion 62. The claw portions 62A engage with the motor housing portion 21 by being inserted into the lower opening 21D of the motor housing portion 21 (see FIG. 13 ). Due to the engagement between the motor housing portion 21 and the claw portions 62A, the rear end of the cover portion 62 can move in the front-rear direction but cannot move downward. The cover portion 62 is fixed to the case 4 with the claw portions 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] 12 and 13 , the light cover 60, which includes the light-emitting body holding portion 61 and the cover portion 62, covers substantially the entire lower surface of the case 4. When assembling the angle fastening tool 1, an assembler places the light unit 17 on the mounting surface 81 via the buffer member 59, connects the connectors 66A and 66B, and then attaches the light cover 60 to the case 4. The light cover 60 is fixed to the case 4 with the four boss portions 61H and screws 60S in a state where the claw portions 62A are inserted and engaged into the lower opening 21D of the motor housing portion 21. When replacing the light unit 17 for maintenance or the like, the light assembly including the light unit 17, the second lead wire 65B, and the connector 66B can be removed from the angle fastening tool 1 simply by removing the light cover 60 from the case 4 in the reverse order and then separating the connectors 66A and 66B.

[0156] (Structure of operation panel and holding structure of operation panel) Fig. 17 is a perspective view from below showing the operation panel 16 when the housing 2 is in a divided state. Fig. 18 is a perspective view of the housing showing the holding structure of the operation panel 16. Fig. 19 is a side view of the first housing 2L showing the holding structure of the operation panel 16. Fig. 20 is a side view of the second housing 2R showing the holding structure of the operation panel 16. Fig. 21 is a horizontal cross-sectional view of the housing showing the holding structure of the operation panel 16. Fig. 22 is a cross-sectional view taken along the left-right direction of the housing 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 disposed, and a holding groove 21C formed on the inner surface of the housing 2. The switch board 16C is held in the housing 2 by inserting a portion of the switch board 16C into the holding groove 21C.

[0158] Specifically, as shown in FIGS. 21 and 22 , the housing 2 is configured by coupling together a first housing 2L including the panel opening 21B and a first portion PS1 of the retaining groove 21C, and a second housing 2R including a second portion PS2 of the panel opening 21B and the retaining groove 21C. The first housing 2L and the second housing 2R are a pair of left and right half 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. 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 coupled to each other with screws 2S (see FIG. 1 ) while the mating surfaces FS are in contact with each other. The first housing 2L and the second housing 2R are coupled to each other with the operation panel 16 sandwiched between them.

[0159] 19 and 21 , the panel opening 21B and the first portion PS1 of the holding groove 21C formed in the first housing 2L constitute the left half of the panel opening 21B and the left half of the holding groove 21C. The left half of the operation panel 16 is disposed in the first portion PS1. The switch plate 16D and the left portions of the operation button 16A are disposed in the first portion PS1 of the panel opening 21B. The left portion of the switch board 16C is disposed in the first portion PS1 of the holding groove 21C.

[0160] 20 and 21 , the panel opening 21B and the second portion PS2 of the holding groove 21C formed in the second housing 2R constitute the right half of the panel opening 21B and the right half of the holding groove 21C. The right half of the operation panel 16 is disposed in the second portion PS2. The switch plate 16D and the right portions of the operation button 16A are disposed in the second portion PS2 of the panel opening 21B. The right portion of the switch board 16C is disposed in the second portion PS2 of the holding groove 21C.

[0161] As shown in FIGS. 17 to 20 , the retaining groove 21C is provided on at least one of the one end (front end) and the other end (rear end) of the switch board 16C on the mating surface FS between the first housing 2L and the second housing 2R. In this embodiment, the retaining groove 21C is provided on both the one end (front end) and the other end (rear end) of the switch board 16C. Therefore, the retaining groove 21C supports both the front and rear ends of the switch board 16C. That is, the retaining groove 21C accommodates and holds the front edge of the front end of the switch board 16C, which extends in the left-right direction. The retaining groove 21C accommodates and holds the rear edge of the rear end of the switch board 16C, which extends in the left-right direction. This prevents the switch board 16C from being displaced in the up-down direction. The retaining groove 21C functions to prevent the operation panel 16 from coming off upward and to support a downward external force acting when the operation panel 16 is operated. The holding groove 21C may be provided only on one end side (front end side) of the switch board 16C, or may be provided only on the other end side (rear end side) of the switch board 16C.

[0162] 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 split into left and right halves, and the mating surface FS is a surface that extends along the front-to-rear and up-down directions, so the first direction A is the left-to-right direction. A first portion PS1 of the retaining groove 21C in the first housing 2L extends leftward from the mating surface FS of the first housing 2L. A second portion PS2 of the retaining groove 21C in the second housing 2R extends rightward from the mating surface FS of the second housing 2R.

[0163] When assembling the operation panel 16, first, the left half of the operation panel 16 is inserted leftward from the mating surface FS into the first portion PS1 of the first housing 2L. The left portion of the switch board 16C is inserted into the first portion PS1 of the holding groove 21C on the first housing 2L. The right half of the operation panel 16 protrudes rightward 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 portion PS2 of the holding groove 21C on the second housing 2R. As a result, the left and right sides of the switch board 16C are inserted into the first and second portions PS1 and PS2 of the holding groove 21C, respectively.

[0164] During assembly, the worker can insert the switch board 16C into the retaining groove 21C while visually checking the mating surface FS (first portion PS1 of the retaining groove 21C) of the first housing 2L. On the other hand, when inserting the right side of the switch board 16C, it is difficult to visually check the position of the retaining groove 21C (second portion PS2) of the second housing 2R. Therefore, in this embodiment, the retaining groove 21C (second portion PS2) on the second housing 2R side is structured to make 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 board 16C in a second direction B that connects one end of the switch board 16C to the other end in a cross section along the mating surface FS. The second direction B is the front-to-rear direction in this embodiment. The second portion PS2 of the retaining groove 21C has a second clearance CL2 between it and the switch board 16C in the second direction B, which is larger than the first clearance CL1. By increasing the second clearance CL2 for the second portion PS2, whose relative position with the switch board 16C is difficult to visually recognize during assembly, the switch board 16C can be easily inserted.

[0166] The operation panel 16 is positioned relative to the housing 2 in the front-to-rear and left-to-right directions by fitting the switch plate 16D into the panel opening 21B. The first clearance CL1 and the second clearance CL2 are both larger than the gap in the front-to-rear direction 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 naturally be inserted into the second portion PS2 of the holding groove 21C.

[0167] In this embodiment, in addition to the retaining groove 21C, the housing 2 further has a structure for supporting a downward external force when the switch SW (operation button 16A) on the operation panel 16 is pressed. 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 for supporting the switch board 16C, located adjacent to the side opposite to the panel opening 21B (i.e., the lower side) with respect to the switch board 16C. In this 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 underside of the left edge that is the left end of the switch board 16C and extends in the front-to-rear direction. The support surface 151 of the second housing 2R supports the underside of the right edge that is the right end of the switch board 16C and extends in the front-to-rear direction.

[0169] Each support surface 151 extends in the second direction B (front-rear direction) along an edge (left edge, right edge) of the switch board 16C. The end of each support surface 151 in the second direction B is connected to the holding groove 21C. Therefore, the outer periphery of the switch board 16C is supported by the holding grooves 21C extending in the first direction A (left-right direction) along the front and rear edges of the switch board 16C and the support surfaces 151 extending in the second direction B (front-rear direction) along the left and right edges of the switch board 16C.

[0170] The support surfaces 151 are provided at the front and rear of the switch board 16C in the second direction B (front-rear direction). In this embodiment, engagement claws (first engagement claw 166 and second engagement claw 167, described later) of the switch plate 16D are located at the center of the left and right edges of the switch board 16C in the front-rear direction, so the support surfaces 151 support 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 in the second direction B that allows the engagement claws to pass through.

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

[0172] The protrusion 152 elastically deforms and adheres to the surface of the switch board 16C. That is, when not inserted into the holding groove 21C, the protrusion 152 protrudes downward to a position lower than the designed position of the upper surface of the switch board 16C. Therefore, when the switch board 16C is inserted into the holding groove 21C, the lower end of the protrusion 152 comes into contact with the upper surface of the switch board 16C and elastically deforms. In other words, when the switch board 16C is inserted into the holding groove 21C, the protrusion 152 is crushed by the switch board 16C and adheres to the upper surface of the switch board 16C. The switch board 16C is sandwiched between the protrusion 152 and the lower surface of the holding groove 21C inside the holding groove 21C. This prevents the switch board 16C from rattling in the vertical direction within the holding groove 21C.

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

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

[0175] The switch board 16C has a flat plate shape with an upper surface 161 facing the panel opening 21B and a lower surface 162 facing the opposite side of the panel opening 21B. The switch board 16C has a roughly rectangular shape in a plan view. The four corners of the switch board 16C are beveled at an angle. The planar shape of the switch board 16C is not limited to a rectangular shape and can be any shape.

[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 a first engagement claw 166 of the switch plate 16D is disposed 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 a second engagement claw 167 of the switch plate 16D is disposed in the second notch 164.

[0177] As shown in FIG. 17 , the switch board 16C is held in the holding groove 21C. The switch board 16C is longer in the second direction B (front-rear direction) than the switch plate 16D. Both ends of the switch board 16C in the second direction B (front-rear direction) are disposed within the holding groove 21C. The switch board 16C is mounted with switches SW (operation buttons 16A) and indicator displays 16B. The switch board 16C is formed with a circuit pattern (not shown) for connecting the switches SW and indicator displays 16B to the controller 18. The switch board 16C is also mounted with the switch plate 16D. The switch board 16C is mounted with the electrical circuit of the operation panel 16 and functions as a support structure for supporting the various components of the operation panel 16. As shown in FIG. 17 , a connection terminal portion 16E for connecting to the controller 18 and other components are provided on the underside 162 of the switch board 16C, but these are not shown in FIGS. 23 to 25 for convenience.

[0178] The switches SW (operation buttons 16A) and indicator displays 16B are mounted on the upper surface 161 of the switch board 16C. The switches SW are configured as operation buttons 16A, but may be switches other than buttons, such as dip switches, rocker switches, or rotary switches. The indicator displays 16B are configured as LED elements. Four indicator displays 16B are provided on the upper surface 161 of the switch board 16C. The four indicator displays 16B are linearly arranged at intervals in the first direction A (left-right direction). The switches SW are arranged on the other end (rear) of the upper surface 161 of the switch board 16C in the second direction B (front-rear direction). The four indicator displays 16B are arranged on one end (front) of the upper surface 161 of the switch board 16C in the second direction B (front-rear direction). The positions and number of the switches SW are not limited to the example shown in the figure and are arbitrary. The position and number of the indicator displays 16B are not limited to the example shown in the figure, and may be any position and number.

[0179] The switch plate 16D is disposed 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 has a plate portion 165 , a first engagement claw 166 , a second engagement claw 167 , and a switch label 168 .

[0181] The plate portion 165 is a main body portion of the switch plate 16D having 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. The plate portion 165 has a roughly rectangular shape in a plan view. 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 a through-hole that penetrates the thickness direction (vertical direction) of the plate portion 165. Specifically, the plate portion 165 has a switch hole 170 and an indicator hole 171.

[0183] The switch SW is disposed inside the switch hole 170. The switch hole 170 is circular, but may be rectangular or other shapes other than circular, and the planar shape is arbitrary. The switch hole 170 ensures installation space for the switch SW mounted on the switch board 16C, and enables the switch to be operated from the outside (above).

[0184] The number of indicator holes 171 is the same as the number of indicator displays 16B (four in this embodiment). The four indicator holes 171 are separated from one another. One indicator display 16B is disposed inside each indicator hole 171. The indicator holes 171 ensure installation space for the indicator displays 16B mounted on the switch board 16C and allow the illuminated status of the indicator displays 16B to be visually confirmed from the outside (above). The separation of the indicator holes 171 from one another prevents light leakage from the individual indicator displays 16B. Each indicator hole 171 is rectangular, but may be circular or other shapes other than rectangular, and the planar shape may be any shape. Each indicator hole 171 may have a shape corresponding to the information displayed by the indicator display 16B (such as a number indicating the operating mode or a pictogram indicating the currently active function).

[0185] 24 and 25 , the first engagement claw 166 and the second engagement claw 167 are provided at opposing positions on the outer periphery of the plate portion 165. In the embodiment, the first engagement claw 166 is disposed on the left edge of the plate portion 165, and the second engagement claw 167 is disposed on the right edge of the plate portion 165. The first engagement claw 166 and the second engagement claw 167 face each other in the first direction A (left-right direction).

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

[0187] The first engagement claw 166 and the second engagement claw 167 come into contact with the lower surface 162 of the switch board 16C from below. In other words, the plate portion 165 is located above the switch board 16C, and the tips of the first engagement claw 166 and the second engagement claw 167 are located below the switch board 16C. The switch plate 16D is attached to the switch board 16C by engaging the first engagement claw 166 and the second engagement claw 167 extending from the plate portion 165 with the lower surface 162 of the switch board 16C.

[0188] The first engagement claw 166 has an L-shape that allows the switch board 16C to be positioned between the plate portion 165 and the first engagement claw 166. Specifically, the first engagement claw 166 has an intermediate portion 166A extending downward from the underside of the plate portion 165 and a tip portion 166B that bends rightward 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) the left side of the left side of the switch board 16C. The intermediate portion 166A is positioned inside the first notch 163 on the outer periphery of the switch board 16C. As shown in FIG. 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 middle portion 166A fits inside the first notch 163 and does not protrude beyond the first notch 163 in the first direction A (left-right direction). The tip portion 166B overlaps with the switch board 16C in the up-down direction. The tip portion 166B faces the lower surface 162 of the switch board 16C in the up-down direction. The tip portion 166B of the first engagement claw 166 engages with the left edge portion of the switch board 16C.

[0189] The second engagement claw 167 has a snap-fit ​​shape that allows it to engage and disengage with the switch board 16C through elastic deformation. Specifically, the second engagement claw 167 has an intermediate portion 167A extending downward from the underside of the plate portion 165 and a tip portion 167B that bends leftward from the lower end of the intermediate portion 167A toward the center of the plate portion 165. The intermediate portion 167A passes through the outer side (right side) of the right side surface of the switch board 16C. The intermediate portion 167A is disposed inside the second notch 164 on the outer periphery of the switch board 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 the switch board 16C in the vertical direction. The tip portion 167B faces the lower surface 162 of the switch board 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 board 16C and directs the external force applied from the switch board 16C outward (to the right) 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 engagement claw 167 engages with the switch board 16C. The tip portion 167B of the second engagement claw 167 engages with the right edge of the switch board 16C.

[0190] Thus, in this embodiment, the second engagement claws 167 have a snap-fit ​​shape that elastically deforms, while the first engagement claws 166 are non-snap-fit ​​and engage with the switch board 16C without elastic deformation. When attaching the switch plate 16D to the switch board 16C, first, the left edge portion (first notch 163) of the switch board 16C is inserted into the inside of the first engagement claw 166, and the left edge portion of the switch board 16C is engaged with the first engagement claw 166. Next, the right edge portion (second notch 164) of the switch board 16C is pressed against the guide surface 167C of the second engagement claw 167. The second engagement claws 167 elastically deform so as to be pushed outward (to the right) in the first direction A (left-right direction) along the guide surface 167C. The elastic deformation of second engagement claw 167 causes the right edge of switch board 16C to pass tip 167B of second engagement claw 167 and move inward of second engagement claw 167. When the right edge of switch board 16C passes tip 167B, the pressing force on second engagement claw 167 is removed, and second engagement claw 167 returns to its original position due to its elasticity. As a result, tip 167B of second engagement claw 167 engages with the underside of the right edge of switch board 16C.

[0191] 24, in this embodiment, the width WF1 of the first engagement claw 166 is larger than the width WF2 of the second engagement claw 167. Note that the widths WF1 and WF2 are widths in the second direction B (front-rear direction).

[0192] 25 , in this embodiment, the protrusion height HF1 of the first engagement claw 166 from the plate portion 165 is smaller than the protrusion height HF2 of the second engagement claw 167 from the plate portion 165. The protrusion heights HF1 and HF2 are the amounts of protrusion downward (i.e., toward the switch board 16C) from the underside of the plate portion 165, and may also be referred to as the length of the engagement claw.

[0193] The first and second engagement claws 166 and 167 are formed integrally with the plate portion 165. The first and second engagement claws 166 and 167 may be fixed to the plate portion 165 separately. The switch plate 16D and the switch board 16C are fixed to each other using, for example, an adhesive or adhesive tape (not shown). This improves the resistance to vibration during use of the angle fastening tool 1. In this case, the first and second engagement claws 166 and 167 function as temporary fasteners for fastening with the adhesive or adhesive tape. The first and second engagement claws 166 and 167 are positioned inside the first and second notches 163 and 164, respectively, and function as positioning claws that determine the relative positions of the switch plate 16D and the switch board 16C in the second direction B (front-rear direction). The switch plate 16D and the switch board 16C may be fixed to each other using the engagement claws without using adhesive or adhesive tape.

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

[0195] 23 and 25 , the switch label 168 is provided on the surface (upper 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 disposed in the center portion 173 of the plate portion 165. The switch label 168 covers the switch SW. The switch label 168 is provided on the upper surface of the center portion 173 of the plate portion 165, and covers and closes the upper opening of the switch hole 170. In this way, the switch label 168 covers the upper part of the switch SW.

[0196] Similarly, the switch label 168 covers the indicator displays 16B. The indicator displays 16B fit inside the indicator holes 171 without protruding from the indicator holes 171. The switch label 168 covers and closes the upper openings of the indicator holes 171. This causes the switch label 168 to cover the top of each indicator display 16B.

[0197] 25 , the switch label 168 has a pressing portion 174 with a convex cross-sectional shape including a top surface 175 and corner portions 176. The pressing portion 174 is provided on a portion of the switch label 168 that covers the upper opening of the switch hole 170. The pressing portion 174 protrudes upward from a flat portion of the switch label 168 that contacts the upper surface of the plate portion 165. In a 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 a rectangle or other polygonal shape, or any other 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 peripheral portion (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 (operation button 16A) is pressed via the pressing portion 174.

[0199] Top surface 175 is a flat surface. Corner 176 forms the peripheral edge of top surface 175. Pressing portion 174 has a shape that protrudes upward from the outer periphery outside corner 176, then bends at corner 176 to connect to flat top surface 175. In this way, pressing portion 174 is not a rounded dome-like convex shape, but is formed in a convex shape with an edge (corner 176) on the outer periphery of top surface 175. Corner 176 is effective in allowing the position of switch SW to be recognized by touch without relying on vision when operating operation panel 16.

[0200] As shown in FIG. 25 , the top surface 175 of the pressing portion 174 is located below the peripheral portion 172 of the plate portion 165. That is, in this embodiment, the protruding height HP1 of the peripheral portion 172 from the switch board 16C is greater than the protruding height HP2 of the top surface 175 of the switch label 168 from the switch board 16C. The top surface 175 of the switch label 168 is located between the upper end of the peripheral portion 172 and the upper surface of the central portion 173 in the vertical direction. The top surface 175, which is the pressing surface, is located in a recessed position in the operation panel 16. This prevents the pressing portion 174 from coming into contact with the installation surface, even when the angle fastening tool 1 is placed on the installation surface with the tool holder 51 facing upward. This prevents unintended operation of the operation panel 16.

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

[0202] As described above, the angle fastening tool 1 includes the 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 by the case 4. The bearing 38F is held in the rear portion of the case 4.

[0203] 26 , the angle fastening tool 1 includes 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 fixes the intermediate support member 91 together with the case 4 simply by sandwiching it between them. Therefore, the bearing 38F is held by sandwiching the bearing 38F and the intermediate support member 91 that is disposed on the rear surface of the bearing 38F between the fixing member FM and the case 4.

[0204] The fixing member FM may be an independent member, or may be integrally formed with a member included in the angle fastening tool 1 so as to constitute a part of that member. In the 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 33 is fitted into 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 a stepped portion of the rotor shaft 33.

[0206] As shown in Figures 26 and 27, the case 4 has an accommodating recess 85 that recesses forward from the rear of the case 4 and accommodates the bearing 38F. The bearing 38F is disposed inside the accommodating recess 85. The case 4 has an outer tubular portion 86 on which a case flange 4F is formed, and an inner tubular portion 87 on which the accommodating recess 85 is formed. The inner tubular portion 87 is formed radially inward from the outer tubular portion 86. The inner tubular portion 87 has a cylindrical shape, and its inner diameter decreases in a stepped manner. That is, the inner tubular portion 87 includes an accommodating 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 accommodating recess 85 is a recess that recesses forward from the rear surface of the case 4. The bearing 38F is disposed inside the accommodating recess 85. The bearing 38F contacts the inner circumferential surface of the accommodating recess 85 and the front surface of the accommodating recess 85 (the portion of the step with the hole 88), which corresponds to the bottom surface of the accommodating recess 85. The hole 88 is a through-hole that runs along the rotation axis AX. The bevel gear 35 is disposed within the hole 88. The bevel gear 35 passes through the hole 88 and meshes with the driven gear 41A.

[0207] With this configuration, the case 4 has a radial support surface 85A that supports a radial load acting on the bearing 38F and a front support surface 85B that supports a forward thrust load acting on the bearing 38F. The radial support surface 85A is the inner circumferential surface of the accommodating recess 85. The front support surface 85B is the front surface (bottom surface) of the accommodating 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. A groove 85D in which an O-ring 85C is disposed is provided on the radial support surface 85A. The O-ring 85C contacts the inner surface of the groove 85D and the outer ring 72.

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

[0210] 26 , 28 , and 29 , the support wall 21G, which is the fixed member FM, directly or indirectly supports the rear surface of the bearing 38F on the front surface of the motor housing portion 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 forms part of the front surface of the motor housing portion 21.

[0211] Specifically, the front surface of the motor housing portion 21 includes a housing flange portion 21F with screw insertion holes 21H formed in the four corners, an annular rib 21E protruding forward from the housing flange portion 21F, and a support wall 21G. The annular rib 21E is disposed in the space between an outer cylindrical portion 86 and an inner cylindrical portion 87 of the case 4. The inner cylindrical portion 87 is disposed on the inner periphery of the annular rib 21E. A protrusion 21J protruding forward is provided on the lower portion of the annular rib 21E. The protrusion 21J is inserted into an engagement hole 89 of the case 4. The protrusion 21J and the engagement hole 89 determine the rotational position of the case 4 about the rotation axis AX relative to the motor housing portion 21.

[0212] The support wall 21G is disposed inside the annular rib 21E. The support wall 21G extends radially inward from the annular rib 21E. A central opening 92 through which the rotor shaft portion 33 passes is formed in the support wall 21G. The support wall 21G is ring-shaped. The support wall 21G faces the front support surface 85B of the accommodating 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 an intermediate support member 91.

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

[0214] The front surface of the intermediate support member 91 contacts the rear surface of the bearing 38F, and the rear surface of the intermediate support member 91 contacts the fixed member FM. 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 a 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 to surround the periphery of 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 non-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 taken 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 periphery of the intermediate support member 91 is linear, and the outer periphery of the intermediate support member 91 is rectangular except for the gap CL.

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

[0217] Either the intermediate support member 91 or the fixed member FM elastically deforms the other. In other words, either the intermediate support member 91 or the fixed member FM is assembled in a state where it is compressed in the front-to-rear direction by the force that holds the intermediate support member 91. This eliminates any gap (backlash) in the front-to-rear direction of the bearing 38F between the case 4 and the fixed member FM.

[0218] Either the intermediate support member 91 or the fixed member FM may be elastically deformed, but in this embodiment, as shown in Figure 30, the fixed member FM is elastically deformed. Specifically, the intermediate support member 91 has a higher hardness than the fixed member FM. The intermediate support member 91 is made of metal. The fixed member FM is made of resin. The fixed member FM sandwiches the intermediate support member 91 while elastically deforming. The intermediate support member 91 is sandwiched so that its rear surface is slightly recessed into the fixed member FM. For convenience, the deformed state of the fixed member FM is not shown in any of the figures except Figure 30.

[0219] In the embodiment, the radial width W1 of the rear surface of the intermediate support member 91 is greater than the radial width W2 of the outer ring 72 (i.e., the thickness of the outer ring 72). Therefore, the intermediate support member 91 contacts the fixed member FM over a larger area than the outer ring 72, thereby fulfilling the function of dispersing the thrust load acting from the outer ring 72.

[0220] Here, the load acting on the bearing 38F will be described. In this embodiment, the bevel gear 35 and the driven gear 41A are spiral bevel gears. A spiral bevel gear is a bevel gear with tooth traces that curve in a spiral shape centered on the rotation axis. Compared to a straight bevel gear with tooth traces that extend linearly and radially, a spiral bevel gear has a larger contact area between gears and a larger number of simultaneously meshing teeth, resulting in characteristics such as high strength (high torque transmission), low noise, low vibration, and low wear.

[0221] When a spiral bevel gear transmits rotation, not only a radial load but also a thrust load is generated. The thrust load depends on the gear ratio of the bevel gear 35 and the driven gear 41A, but the direction of the thrust load may be reversed depending on the difference between the forward and reverse rotation directions. Therefore, the bevel gear 35 may be subjected to a radial load in the diameter direction and thrust loads in both the forward and backward directions along the rotation axis AX.

[0222] 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 33 and the inner ring 71 of the bearing 38F is fixed to the rotor shaft 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 the 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, resulting in localized large surface pressure. However, by interposing the intermediate support member 91 between the outer ring 72 and the rear support surface 94 to increase 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 21 is reduced.

[0223] 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 Member) FIG. 31 is an exploded perspective view showing a subassembly of the rotor 27 according to the embodiment. As shown in FIG. 31 , when assembling the angle fastening tool 1, a subassembly is assembled in which related components such as the bearing 38F and the intermediate support member 91 are attached to the rotor 27 in advance. These components are assembled to the rotor shaft 33 so that the fan 12, the intermediate support member 91, the bearing 38F, and the bevel gear 35 are arranged in order from the rear. In this embodiment, because the intermediate support member 91 has a C-shape, the intermediate support member 91 can be radially assembled to the rotor shaft 33 by passing the rotor shaft 33 through the gap CL. In other words, even if the bearing 38F and the bevel gear 35 are attached first, the intermediate support member 91 can be assembled in the predetermined position later. Therefore, even if the intermediate support member 91 is forgotten to be attached, it can be addressed later, resulting in high assembly workability.

[0225] (Method of Use) A method of using the angle fastening tool 1 according to the embodiment will be described. For example, when performing fastening work on a work object, a socket, which is a tip tool, is attached to the tip tool holder 51. When the trigger lever 14 is operated by the operator, power is supplied from the battery 25, the motor 6 is started, and light is emitted from the light emitter 53 of the light unit 17. The light from the light unit 17 is emitted downward from around the anvil 10, so that the light can reach the work location even in a narrow, confined space with many obstacles. The light emitted from the light unit 17 has a high luminous intensity and can brightly illuminate the work location.

[0226] The rotor 27 is rotated by driving the motor 6. When the rotor 27 rotates, the rotational force of the rotor 27 is transmitted to the spindle 8 via the speed reducer 7. The spindle 8 rotates at a rotational speed lower than the rotational speed of the rotor shaft 33. When the spindle 8 rotates while the hammer protrusion 47B and the anvil protrusion 10B are in contact with each other, the anvil 10 rotates together with the hammer 47 and the spindle 8. The rotation of the anvil 10 rotates the tool bit, and the fastening operation progresses.

[0227] As the fastening operation progresses, if a load equal to or greater than a predetermined value acts on the anvil 10 via the tool bit, the rotation of the anvil 10 and hammer 47 stops. When the spindle 8 rotates while the hammer 47 is stopped, the hammer 47 moves upward. As the hammer 47 moves upward, the hammer protrusion 47B and the anvil protrusion 10B are released from contact, and the hammer 47, which has 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 by the hammer 47 in the rotational direction. This causes the anvil 10 and the tool bit to rotate about the rotation axis BX with high torque. Therefore, the bolt or nut is tightened with high torque.

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

[0229] In the above configuration, the switch board 16C can be moved closer to the motor 6 in the front-to-rear direction to a position where the switch board 16C overlaps the motor 6 in the up-down direction. Accordingly, the trigger lever 14 can also be positioned near the rear of the switch board 16C. By moving the switch board 16C, motor 6, and trigger lever 14 closer to each other in the front-to-rear 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.

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

[0231] In the above configuration, the switch board 16C, the motor 6, and the trigger lever 14 can be positioned close to each other in the front-rear 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 the switch.

[0232] In this embodiment, the motor 6 has a stator 26 and a rotor 27 that is rotatable relative to the stator 26. The angle fastening tool 1 includes bearings (38F, 38R) that are disposed on the front and rear sides of the rotor 27 and rotatably support the rotor 27. A distance L3 in the front-to-rear direction between the trigger lever 14 and the rear bearing 38R is smaller than a length L10 in the front-to-rear direction 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 locating the motor 6, which is a heavy component, close to the trigger lever 14, the center of gravity CG of the angle fastening tool 1 can be brought closer to the trigger lever 14. This makes it easier to move the tool tip holder 51, improving the handling of the angle fastening tool 1.

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

[0235] In the above configuration, by arranging the controller 18 behind the switch board 16C, it is not necessary to arrange 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 reduced in the front-to-rear direction.

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

[0237] In the above configuration, the battery holding portion 23 to which the battery 25 is attached can be used to ensure storage space for the controller 18. Even if the controller 18 is disposed behind the switch board 16C, the overall length of the angle fastening tool 1 can be prevented from increasing.

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

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

[0240] In the 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 closer to each other in the front-rear direction, thereby 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, making the angle fastening tool 1 easier to handle.

[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, on which the spindle 8 is arranged, can be placed in front of the work area to perform fastening.

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

[0245] With the above configuration, even the angle fastening tool 1, which is suitable for work in tight spaces, can be an impact tool that can achieve a high tightening torque by striking with the hammer 47. Even when the hammer 47 is located on the front end side of the angle fastening tool 1, the switch board 16C, motor 6, and trigger lever 14 can be brought closer in the front-rear direction, resulting in good weight balance and improved maneuverability.

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

[0247] In the above configuration, the controller 18 is disposed behind the motor 6, the switch board 16C, and the trigger lever 14. Because the switch board 16C is disposed near the surface of the housing, the controller 18 is not disposed near the switch board 16C between the motor 6 and the trigger lever 14, thereby shortening the distance between the motor 6 and the trigger lever 14. Because the switch board 16C, the motor 6, and the trigger lever 14 can be disposed closer to each other in the front-to-rear direction, the operability of the trigger lever 14 and the switches can be improved while reducing the overall length of the angle fastening tool 1. As a result, the operability of the angle fastening tool 1 can be improved.

[0248] In this embodiment, the motor 6 has a stator 26 and a rotor 27 that is rotatable relative to the stator 26. The angle fastening tool 1 includes bearings (38F, 38R) that are disposed on the front and rear sides of the rotor 27 and rotatably support the rotor 27. The front end 16F of the switch board 16C is disposed forward of the rear bearing 38R.

[0249] In the above configuration, the switch board 16C can be brought closer to the motor 6, so that the switch board 16C, the motor 6, and the trigger lever 14 can be brought even closer.

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

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

[0252] In the embodiment, the angle fastening tool 1 (electric work machine) includes a housing 2 and an operation 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 disposed, and a holding groove 21C formed on the inner surface of the housing 2. The switch board 16C is held in the housing 2 by inserting a portion of the switch board 16C into the holding groove 21C.

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

[0254] In the embodiment, the housing 2 is configured by joining together a first housing 2L including the panel opening 21B and a first portion PS1 of the retaining groove 21C and a second housing 2R including the panel opening 21B and a second portion PS2 of the retaining groove 21C. The retaining groove 21C is provided on at least one of one end side and the other end side of the switch board 16C on the mating surfaces 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 holding groove 21C (first portion PS1 or second portion 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 in the holding groove 21C. This facilitates the assembly work of the switch board 16C and enables the switch board 16C to be firmly held.

[0256] In this embodiment, the holding grooves 21C are provided on both one end side and the other end side of the switch substrate 16C.

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

[0258] In the embodiment, the first portion PS1 of the retaining groove 21C has a first clearance CL1 between it and the switch board 16C in the second direction B that connects one end of the switch board 16C to the other end 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 board 16C in the second direction B that is larger than the first clearance CL1.

[0259] In the above configuration, the small first clearance CL1 in the first portion PS1 of the retaining groove 21C reduces rattle of the switch board 16C in the retaining groove 21C. The large second clearance CL2 in the second portion PS2 of the retaining groove 21C facilitates the task of fitting the retaining groove 21C (second portion PS2) of the second housing 2R to the switch board 16C inserted in the retaining groove 21C (first portion PS1) of the first housing 2L. In other words, because the large second clearance CL2 makes it easy to insert the switch board 16C 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 the embodiment, at least one of the first housing 2L and the second housing 2R has a support surface 151 that supports the switch board 16C, at a position adjacent to the switch board 16C on the side opposite to the panel opening 21B. The support surface 151 is provided at a position that contacts the edge of the switch board 16C in the first direction A.

[0261] In the above configuration, an external force acting on the switch board 16C when the switch SW is operated can be received by the support surface 151 in addition to the holding groove 21C.

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

[0263] In the above configuration, the support surfaces 151 can further improve the support strength against external forces acting on the switch board 16C.

[0264] In the embodiment, the holding groove 21C has a protrusion 152 that protrudes toward the surface of the switch substrate 16C on which the switch SW is mounted. The protrusion 152 is in close contact with the surface of the switch substrate 16C while undergoing elastic deformation.

[0265] In the above configuration, the protrusion 152 is elastically deformed by the switch board 16C within the holding groove 21C, thereby preventing rattling of the switch board 16C in the thickness direction and ensuring that the switch board 16C comes into contact with the support surface 151.

[0266] In this embodiment, the switch plate 16D has a plate portion 165, and a first engagement claw 166 and a second engagement claw 167 that are provided at opposing positions on the outer periphery of the plate portion 165 and that engage with the switch board 16C, respectively.

[0267] In the above configuration, no screws are required, and the switch plate 16D can be easily attached to the switch board 16C.

[0268] In the embodiment, the first engagement claw 166 has an L-shape that allows the switch board 16C to be disposed between the plate portion 165 and the first engagement claw 166. The second engagement claw 167 has a snap-fit ​​shape that allows it to engage with and disengage from the switch board 16C by elastic deformation.

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

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

[0271] The above configuration can improve the mechanical strength of the non-snap-fit ​​first engagement claw 166. By reducing the width WF2 of the snap-fit ​​second engagement claw 167, it becomes easier to deform, and therefore the force required to attach the switch plate 16D can be reduced.

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

[0273] In the above configuration, by reducing the protrusion height HF1, it is possible to improve the mechanical strength of the non-snap-fit ​​first engagement claw 166. By increasing the protrusion height HF2, it is possible to make the snap-fit ​​second engagement claw 167 more easily deformable, thereby reducing the force required to attach the switch plate 16D.

[0274] In the embodiment, the outer periphery of the switch board 16C is formed with a first notch 163 in which a portion of the first engagement claw 166 is disposed, and a second notch 164 in which a portion of the second engagement claw 167 is disposed.

[0275] In the above configuration, the first engagement claws 166 and the second engagement claws 167 do not protrude from the outer periphery of the switch board 16C, or the amount of protrusion is reduced, thereby making it possible to miniaturize the operation panel 16. Furthermore, the first engagement claws 166 and the second engagement claws 167 are disposed inside the first cutouts 163 and the second cutouts 164, respectively, so the relative positions of the switch board 16C and the switch plate 16D can also be determined. This improves the ease of assembly of the operation panel 16.

[0276] In this embodiment, the switch plate 16D has 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 having a convex cross-sectional shape including a top surface 175 and corner portions 176.

[0277] In the above configuration, the switch SW can be operated by pressing the switch label 168. Because the switch label 168 has the corners 176, the unevenness of the switch label 168 can be easily recognized even when wearing work gloves. For example, compared to when the switch label 168 is smooth and dome-shaped, 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 edge portion 172. The switch label 168 is disposed in the central portion 173 of the plate portion 165. A protruding height HP1 of the peripheral edge portion 172 from the switch board 16C is greater than a protruding height HP2 of the top surface 175 of the switch label 168 from the switch board 16C.

[0279] In the above configuration, the switch label 168 is recessed from the peripheral edge 172 of the plate portion 165. Therefore, unintentional switch operation can be prevented 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 work.

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

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

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

[0283] The intermediate support member 91A has an annular shape that fits along the rear surface of the bearing 38F. The intermediate support member 91A has a circular inner periphery and a generally rectangular outer periphery. The four corners of the outer periphery of the intermediate support member 91A are chamfered. The annular intermediate support member 91A comes into contact with the rear surface of the bearing 38F over the entire circumference.

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

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

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

[0287] In the second embodiment, the intermediate support member 91A has a circular inner periphery and a rectangular outer periphery, but the intermediate support member 91B according to the third embodiment has an annular shape.

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

[0289] When assembling the subassembly, the fan 12, the intermediate support member 91B, the bearing 38F, and the bevel gear 35 are attached to the rotor shaft portion 33 from the front in the axial direction in this order.

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

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

[0292] In the third embodiment, the intermediate support member 91B is in the shape of a ring with a constant thickness, but the intermediate support member 91C according to the fourth embodiment has a stepped ring shape.

[0293] The intermediate support member 91C has an annular shape that fits along the rear surface of the bearing 38F. The intermediate support member 91C has a circular inner periphery and a circular outer periphery. In other words, the intermediate support member 91C is annular. The annular intermediate support member 91C contacts the rear surface of the bearing 38F over the entire circumference.

[0294] The intermediate support member 91C has a step between its inner and outer peripheries that is offset in the thickness direction. In other words, the intermediate support member 91C has an outer periphery 101 and an inner periphery 102 that is located inside the outer periphery 101, and the outer periphery 101 is offset forward from the inner periphery 102. The thickness of the intermediate support member 91C is constant, and the thickness of the inner periphery 102 and the thickness of the outer periphery 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 and the inner peripheral mounting portion 104 are shifted forward relative to the inner peripheral mounting portion 104 in response to the misalignment between the outer peripheral portion 101 and the inner peripheral portion 102 in the front-to-rear direction.

[0296] In the fourth embodiment, the position of the peripheral wall constituting the accommodating recess 85 of the case 4 is shifted forward to correspond to the outer periphery of the intermediate support member 91C and the outer periphery mounting portion 103 of the motor housing portion 21. As a result, the depth D3 (depth from the rear surface to the front) of the accommodating recess 85 of the case 4 is smaller than the front-to-rear thickness D4 of the bearing 38F. The bearing 38F protrudes rearward beyond the rear end of the accommodating recess 85. The rear end of the bearing 38F is located rearward of 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, a rearward thrust load acting on bearing 38F is applied to inner peripheral portion 102 of intermediate support member 91C. Because intermediate support member 91C is in contact with motor housing portion 21 at both inner peripheral portion 102 and outer peripheral portion 101, the thrust load applied to intermediate support member 91C is supported at both inner peripheral portion 102 and outer peripheral portion 101 by inner peripheral mounting portion 104 and outer peripheral mounting portion 103, respectively.

[0298] In the fourth embodiment, because the outer peripheral mounting portion 103 is shifted forward, the thickness required to support the thrust load can be provided forward in the support wall 21G of the motor housing portion 21. This allows the rear surface of the support wall 21G of the motor housing portion 21 to have a shape that does not protrude rearward, making it easier to ensure installation space for the fan 12.

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

[0300] FIG. 37 is a vertical cross-sectional view showing an intermediate support member 91D and a fixed member FM according to the fifth embodiment.

[0301] In the first embodiment, an example was shown in which, of the intermediate support member 91 and the fixed member FM, the fixed member FM elastically deforms. In this fifth embodiment, an example is shown in which, of the intermediate support member 91D and the fixed member FM, the intermediate support member 91D elastically deforms.

[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 sandwiches the intermediate support member 91D while elastically deforming it. 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 fixes the intermediate support member 91D together with the case 4 only by sandwiching them.

[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. This prevents gaps (backlash) from occurring between the fixed member FM and the case 4 at the front and rear of the bearing 38F.

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

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

[0307] In the first embodiment, an example was shown in which the bevel gear 35 was a pinion gear fixed to the rotor shaft portion 33, but 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 an axis separate 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 the rotor 27 and has a shaft 111 that extends in the front-to-rear direction. The angle fastening tool 1A includes a spur gear 112 that is a pinion gear that is directly rotated by the rotor 27. The bevel gear 135 rotates about 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 onto 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 a rotor bearing 113F. The spur gear 112 meshes with a 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 into 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 speed of the spur gear 112. The driven gear 114 constitutes the first stage reduction unit of the reduction mechanism 7.

[0311] The shaft 111 extends in 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 disposed at a position offset in the radial direction from the rotation axis AX.

[0312] The bevel gear 135 is disposed forward of the spur gear 112 and the driven gear 114. The bevel gear 135 is formed integrally with the tip of the shaft 111, or is a separate piece fixed to the tip 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 a first intermediate gear 115A provided on an intermediate shaft 115C.

[0313] The intermediate shaft 115C extends in a direction intersecting the rotation axis AX and the axis 111. The intermediate shaft 115C extends in a vertical direction perpendicular to the rotation axis AX and the axis 111 and is rotatable around a central axis extending 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 the case 4. A first intermediate gear 115A and a 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 decelerating the rotation of the bevel gear 135. The bevel gear 135 and the first intermediate gear 115A constitute a second-stage reduction gear of the reduction mechanism 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 speed of the second intermediate gear 115B. The second intermediate gear 115B and the spindle gear 8C constitute a third-stage reduction gear of the reduction mechanism 7.

[0314] The bearing 139 is supported by the case 4 and rotatably holds the bevel gear 135. The bearing 139 comes into 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 bearings 139 are accommodated in the accommodation recesses 118 of the case 4. The accommodation recesses 118 have a radial support surface 118A and a front support surface 118B. The bearings 139 are ball bearings. In the example shown in FIG. 38 , two sets of bearings 139 are provided side by side in the axial direction.

[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 accommodating recess 118. The intermediate support member 91E contacts the rear end surface of the outer ring of the rear bearing 139 disposed in the accommodating recess 118.

[0317] In the sixth embodiment, the fixing member FM is provided separately from the motor housing portion 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 disposed between the case 4 and the motor housing portion 21 so as to straddle both the case 4 and the motor housing portion 21 in the front-to-rear direction.

[0318] The fixing member FM includes a first housing chamber 121 recessed rearward from the front surface and a second housing chamber 122 recessed forward from the rear surface. 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 end of the rotor shaft portion 33 is disposed in the first housing chamber 121 through the second housing chamber 122.

[0319] The case 4 has a front housing portion 119 that houses the front portion of the fixing member FM. The front housing portion 119 is a recess that recesses forward from the rear surface of the case 4. An accommodation recess 118 for the bearing 139 is formed in the front wall surface, which corresponds to the bottom surface of the front housing portion 119. The front housing portion 119 and the accommodation recess 118 are continuous. Therefore, the intermediate support member 91E is disposed on the front wall surface, which corresponds to the bottom surface of the front housing portion 119. The front portion of the fixing member FM fits into the front housing portion 119. As a result, the front surface of the fixing member FM contacts the rear surface of the intermediate support member 91E. The fixing member FM contacts the rear surface of the intermediate support member 91E at the front end surface of the peripheral wall that defines the first housing chamber 121.

[0320] The motor housing portion 21 has a rear housing portion 120 that houses the rear portion of the fixing member FM. The rear housing portion 120 is a recess that recesses rearward from the front surface of the motor housing portion 21. The rear portion of the fixing member FM fits into the rear housing portion 120. Although not shown, the motor housing portion 21 and the case 4 are connected in the front-rear direction and fastened together by screws 70 facing in the front-rear direction, as in the first embodiment. The axial force of the screws 70 tightens the motor housing portion 21 and the case 4 in a direction that brings them closer to each other in the front-rear direction. As a result, the bearing 139, the intermediate support member 91E, and the fixing member FM are sandwiched between the motor housing portion 21 and the case 4 and held in place by the axial force of the screws 70. As a result, the fixing member FM fixes the intermediate support member 91E together with the case 4 simply by sandwiching them together. The intermediate support member 91E is simply placed in the front housing portion 119, and is fixed together with the bearing 139 by being sandwiched between the front surface of the fixed member FM and the front support surface 118B of the case 4.

[0321] Other Embodiments In the above-described embodiment, the multiple light emitters 53 do not have to be arranged along the circumferential direction of the anvil 10. The multiple light emitters 53 may be arranged, for example, radially in the radial direction of the anvil 10. The optical member 57 does not have to be annular and surround the anvil 10, and may have a shape corresponding to the arrangement of the multiple light emitters 53. The optical member 57 may be, for example, arc-shaped, rectangular, or radial. An optical member 57 may be provided individually for each light emitter 53. The multiple light emitters 53 may be held by the case 4 and may be arranged at the rear of the lower surface of the case 4 or at the bottom of the side surface. For example, the light emitter 53 may emit light obliquely downward from the rear of the lower surface of the case 4, toward the bottom of the anvil 10. The number of light emitters 53 does not have to be multiple, and only one may be provided.

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

[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 have to include the striking mechanism 9 including the hammer 47 and the anvil 10. In this case, the tool holder 51 may be provided at the tip of the spindle 8 and rotate integrally with the spindle 8, or 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 an electric ratchet wrench, an electric angle driver, and an electric angle drill.

[0324] In the above-described 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 need not be provided, and the support wall 21G may directly support the rear surface of the bearing 38F.

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

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

[0327] Fig. 39 is a perspective view from below showing the front part of the angle fastening tool 1B according to the seventh embodiment. Fig. 40 is a bottom view showing the front part 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, but the light unit 201 in this seventh embodiment has a non-annular shape and is located at a position farther away from the anvil 10 than in the first embodiment.

[0329] The light unit 201 is disposed on the underside of the case 4. The light unit 201 is disposed around the cylindrical portion 82. The light unit 201 is disposed 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 so as to be localized behind the anvil 10.

[0330] The light unit 201 includes a plurality of light emitters 53. The light emitters 53 are held by the case 4. The light emitters 53 are held on the lower surface of the case 4. A plurality of light emitters 53 are provided around the anvil 10.

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

[0332] Fig. 41 is an exploded perspective view from below showing the attachment of the light cover 204 to the case 4 according to the seventh embodiment. Fig. 42 is a vertical cross-sectional view taken along the front-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 emitters 53 are provided, and an optical member 203. The substrate 202 is formed in a linear shape (rectangular shape) along the front-rear direction in accordance with the linear arrangement of the plurality of light emitters 53. A plurality of light emitters 53 are arranged on the underside of the substrate 202 at intervals in the front-rear direction. In the embodiment, two light emitters 53 are arranged. The number of light emitters 53 may be one or three or more. By providing a plurality of light emitters 53, it is possible to ensure a sufficient amount of light and a sufficient light irradiation range.

[0334] The optical member 203 is arranged so as to cover the front sides of the plurality of light emitters 53. At least a portion of the optical member 203 is arranged forward of the light unit 201. The optical member 203 is continuous so as to straddle the plurality of light emitters 53. The light transmitting portion 203B of the optical member 203 faces the plurality of light emitters 53. The light transmitting portion 203B covers two light emitters 53 together.

[0335] A portion of the optical member 203 is covered from below by the light cover 204. The portion of the optical member 203 that covers the plurality of light emitters 53 is exposed and not covered by the light cover 204. That is, the light-transmitting portion 203B that covers the plurality of light emitters 53 is exposed downward through the opening 205A of the light cover 204. The light from the plurality of light emitters 53 passes through the light-transmitting portion 203B and passes through the opening 205A of the light cover 204 to be emitted downward in the case 4.

[0336] 41 and 42 , the optical member 203 is formed in the shape of a case with an open top and covers the light-emitting bodies 53 and the substrate 202. The optical member 203 has a side wall portion 203A, a light-transmitting portion 203B, and a convex portion 203C.

[0337] The side wall portion 203A has a rectangular cylindrical shape. The substrate 202, on which multiple light-emitting elements 53 are mounted, is disposed inside the side wall portion 203A. The side wall portion 203A surrounds the multiple light-emitting elements 53 and the substrate 202 in all directions (front-back and left-right). The upper surface of the side wall portion 203A is an open opening. The light-transmitting portion 203B covers the lower surface of the side wall portion 203A. The light-transmitting portion 203B forms the lower surface of the optical element 203. The side wall portion 203A and the light-transmitting portion 203B form the optical element 203, which is roughly a rectangular parallelepiped with an open upper surface. The light-transmitting portion 203B has a rectangular shape (rounded rectangle) when viewed from below. The light-transmitting portion 203B faces the lower 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 emitter 53 passes through the light-transmitting portion 203B. The lower surface of the light-transmitting portion 203B forms the light-emitting surface of the light unit 201. The light-transmitting portion 203B protrudes downward further than the lower end of the side wall portion 203A. When viewed from below, the light-transmitting portion 203B is formed in a rectangular shape that is slightly smaller than the outer shape of the side wall portion 203A. For this reason, a stepped shoulder portion 203D (see FIG. 42) is formed at the boundary between the lower end of the side wall portion 203A and the outer periphery of the light-transmitting portion 203B.

[0338] The protrusion 203C is provided to protrude laterally from the side wall 203A. In the seventh embodiment, the protrusion 203C protrudes leftward from the left side surface of the side wall 203A. The protrusion 203C is disposed inside the guide groove 214A of the case 4, and functions as a positioning portion for the light unit 201 relative to the case 4.

[0339] 42 , the upper surface of the substrate 202 is disposed below the upper end of the side wall portion 203A. The substrate 202 and the plurality of light emitters 53 are disposed in a concave storage space defined by the side wall portion 203A and the light-transmitting portion 203B of the optical member 203. A molded resin 58 is filled into the storage space. The molded resin 58 fixes the plurality of light emitters 53 and the substrate 202, the optical member 203, and a portion of the lead wires 65 to one another. Note that the molded resin 58 does not necessarily have to be provided.

[0340] The case 4 holds a light unit 201. The light unit 201, which includes a plurality of light emitters 53, is held on the underside of the case 4. The angle fastening tool 1B is disposed on the underside of the case 4 and includes a light cover 204 that holds the light emitters 53 and covers the lead wires 65.

[0341] The light cover 204 is separate from the motor housing portion 21. The light cover 204 is separate from the case 4. The light cover 204 engages with the motor housing portion 21. The light cover 204 is attached to the underside of the case 4. The light cover 204 holds the light unit 201 on the underside of the case 4. The light unit 201 is held between the underside of the case 4 and the light cover 204.

[0342] The light cover 204 is a single member in which a light emitter holding portion 205 and a cover portion 206 are integrally formed.

[0343] The light emitter holding portion 205 is disposed on the underside of the case 4 and holds a plurality of light emitters 53. The light emitter holding portion 205 is disposed on the underside of the case 4 at a position adjacent to the rear side of the cylindrical portion 82. The light emitter holding portion 205 covers the periphery of the installation position of the light unit 201. The light emitter holding portion 205 has an opening 205A formed therein that exposes the light transmitting portion 203B of the optical element 203. The opening 205A penetrates from the bottom surface to the top surface of the light emitter holding portion 205. The light transmitting portion 203B is disposed 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 a shoulder portion 203D of the optical element 203. 42 , the light emitter holding part 205 supports from below the shoulder part 203D (the lower end part of the side wall part 203A) of the optical member 203 at the peripheral part of the opening 205A. In this way, the light emitter holding part 205 supports the shoulder part 203D of the optical member 203, and thereby supports the entire light unit 201 including the light emitter 53 from below.

[0344] 40 and 41 , the light emitter holder 205 is fixed to the underside of the case 4 by screws 60S, which tighten the light emitter holder 205 toward the underside of the case 4. The light emitter holder 205 holds the multiple light emitters 53 by pressing the underside (shoulder 203D) of the optical member 203 toward the case 4 with the peripheral edge of the opening 205A. The light emitter holder 205 presses the outer peripheral edge of the underside of the optical member 203. The light emitter holder 205 may simply support the optical member 203 from below without pressing it.

[0345] As shown in FIG. 41 , the light emitter holding portion 205 is fixed at multiple locations around the optical member 203 with screws 60S. Specifically, the light emitter holding portion 205 is fixed with two screws 60S at two locations on both the left and right sides of the light unit 201. Screw holes 211A are formed in a flat mounting surface 211 on the underside of the case 4. In the seventh embodiment, the mounting surface 211 is the bottom surface of the groove portion 212. The two screw holes 211A are arranged on both the left and right sides of the light source arrangement portion 213 in which the light unit 201 is arranged. The light emitter holding portion 205 has insertion holes 205B formed therein, into which the screws 60S are attached. The screws 60S pass from below through the insertion holes 205B of the light emitter holding portion 205 and are fixed into the screw holes 211A.

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

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

[0348] 41 and 43 , the case 4 has a groove 212 on the underside of the case 4 in which the lead wire 65 is disposed. The groove 212 is a recessed portion recessed upward from the underside of the case 4. The groove 212 is provided on the underside of the case 4 along the front-to-rear direction, in a range from the rear end of the cylindrical portion 82 to the rear end of the case 4. The lead wire 65 is disposed in the groove 212.

[0349] In the seventh embodiment, the case 4 has a light source arrangement portion 213 in which a plurality of light emitters 53 are arranged on the underside of the case 4. The light source arrangement portion 213 is arranged on the underside of the case 4, rearward of the rear end portion of the cylindrical portion 82. The light source arrangement portion 213 is arranged at a predetermined position inside the groove portion 212.

[0350] Specifically, a guide wall 214 rising downward from the mounting surface 211 is formed on the mounting surface 211, which is the bottom surface of the groove portion 212. The guide wall 214 defines the positions of the light source mounting portion 213 and the lead wires 65 within the groove portion 212. Two screw holes 211A are formed inside the groove portion 212 and outside the guide wall 214. The guide wall 214 is formed to surround the periphery (front and left / right directions) of the light source mounting portion 213. The light unit 201 and the optical member 203 are disposed in the light source mounting portion 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 mounting portion 213. The guide groove 214A is a recessed groove formed by partially cutting out the guide wall 214, and is formed in the guide wall 214 on the left side of the light source mounting portion 213. The convex portion 203C of the optical member 203 is disposed in this guide groove 214A, thereby determining the position of the light unit 201 in the in-plane directions (front-rear and left-right directions).

[0351] The guide wall 214 opens the rear side of the light source mounting portion 213. The guide walls 214 extend rearward from both the left and right sides of the light source mounting portion 213. A lead wire 65 is arranged in the area between the left and right guide walls 214. A ground wire 67 connected to the ground terminal 84B is also arranged in the area between the left and right guide walls 214. The lead wire 65 and the ground wire 67 are arranged inside the same groove portion 212 and in the area between the left and right guide walls 214.

[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 wires 65 and the ground wire 67 extending from the lower opening 21D (see FIG. 41) of the motor housing portion 21 pass through the passage 84A.

[0353] 41 , the cover portion 206 covers the lead wires 65 and the ground wire 67. The cover portion 206 extends rearward from the rear end portion of the light emitter holding portion 205. The cover portion 206 extends to the front surface 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 portion 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. Due to the engagement between the motor housing portion 21 and the claw portion 62A, the rear end portion of the cover portion 206 can move in the front-to-rear direction but cannot move downward. 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 emitter holding portion 205 and the cover portion 206, covers the lower surface of the case 4 behind the cylindrical portion 82. The light cover 204 fits into the inside of the groove portion 212 to cover the groove portion 212. The light cover 204 covers the portion of the optical member 203 other than the light transmitting portion 203B while exposing the light transmitting portion 203B.

[0356] When assembling the angle fastening tool 1B, an assembler places the light unit 201 and the optical member 203 in the light source placement section 213, arranges the lead wires 65 and the ground wiring 67 so that they fit 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 with two screws 60S passing through the insertion holes 205B, with the claws 62A inserted and engaged in 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 grooves 214A, is placed within the opening 205A of the light cover 204. The optical member 203 is held between the light cover 204 and the underside of the case 4 by the peripheral edge of the opening 205A.

[0357] Fig. 44 is a vertical cross-sectional view showing the front part of an angle fastening tool 1B according to the seventh embodiment. Next, the arrangement position of the light emitter 53 according to the seventh embodiment will be described with reference to Fig. 44 .

[0358] In the seventh embodiment, the light emitter 53 is held on the lower surface of the portion of the case 4 that houses the reduction mechanism 7 .

[0359] The reduction mechanism 7 is housed in the case 4 and transmits the rotational force of the motor 6 to the spindle 8. The reduction mechanism 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. The reduction mechanism 7 is disposed between the spindle 8 and a bearing 38F, which rotatably holds the bevel gear 35, in the front-rear direction. The reduction mechanism 7 is disposed behind the spindle 8 and connected to the spindle 8 from the rear. The reduction mechanism 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 disposed in front of the first reduction unit 41.

[0360] The plurality of light emitters 53, i.e., the light units 201, are arranged on the underside of the case 4 at positions that overlap the speed reduction mechanism 7 in the vertical direction. More specifically, the plurality of light emitters 53 overlap the second reduction gear 42 of the speed reduction mechanism 7 in the vertical direction. The plurality of light emitters 53 are arranged on the underside of a portion of the case 4 that houses the second intermediate gear 42A and the second intermediate shaft 42B that constitute the second reduction gear 42. The plurality of light emitters 53 are arranged on the underside of the end of the portion that houses the speed reduction mechanism 7, on the spindle 8 side.

[0361] 44, the storage space of the case 4 can be understood as being divided into a plurality of sections. That is, the case 4 includes a first section 221 that stores the spindle 8 and the hammer 47, and a second section 222 that is continuous with the rear of the first section 221. In the seventh embodiment, the light emitter 53 is held on the underside of the second section 222 of the case 4.

[0362] In detail, the first part 221 of the case 4 houses a spindle 8 and an impact mechanism 9 including a hammer 47, and an anvil 10 is arranged so as to protrude downward from the underside (cylindrical part 82) of the first part 221.

[0363] The second portion 222 of the case 4 houses the reduction mechanism 7. The first portion 221 and the second portion 222 are separated by a first partition wall 224. The second intermediate gear 42A of the second reduction unit 42 passes above the first partition wall 224 and meshes with the spindle gear 8C. The first partition wall 224 defines the front end of the accommodation space for the reduction mechanism 7.

[0364] 44 , the case 4 includes a third portion 223 that follows the second portion 222. The third portion 223 has an accommodating recess 85 that accommodates the bearing 38F. The second portion 222 and the third portion 223 are separated from each other by a second partition wall 225 that has a hole 88 formed therein. The driven gear 41A of the first reduction unit 41 meshes with the bevel gear 35 that has passed through the hole 88. The second partition wall 225 defines the rear end of the accommodating space for the reduction mechanism 7.

[0365] The plurality of light emitters 53, i.e., the light units 201, are disposed on the underside of the second portion 222 between the first portion 221 and the third portion 223. With respect to their positions in the front-to-rear direction, the plurality of light emitters 53 are disposed either vertically overlapping the first partition 224 or at a position rearward of the first partition 224. The plurality of light emitters 53 are disposed either vertically overlapping the second partition 225 or at a position forward of the second partition 225. The plurality of light emitters 53 are disposed on the first portion 221 side of the second portion 222, i.e., on the side closer to the anvil 10. Therefore, the plurality of light emitters 53 are disposed at a position rearward of 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 the tip tool, and the outer diameter of the socket may be large depending on the size of the bolt or the like to be fastened. In the seventh embodiment, the light unit 201 is positioned near the anvil 10 but at a moderate distance, so that even when a large tool tip is attached, a shadow is less likely to be formed due to the light from the light unit 201 being blocked by the tool tip.

[0366] In an angle fastening tool used in fastening operations in narrow spaces, it is desirable for the vertical dimension of the front end (head) of the case 4, on which the tool holder 51 is provided, to be small. In the example shown in FIG. 44 , the vertical dimension of each sliding surface that rotatably supports the spindle 8 and the anvil 10 is reduced, thereby preventing the vertical dimension of the head from becoming large. 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 each reduced. 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 plain bearings. The vertical dimension of the sliding surface 47E of the hammer 47 with the spindle 8 is less than half 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] Fig. 45 is a vertical cross-sectional view showing an angle fastening tool 1B according to the seventh embodiment. Fig. 46 is a vertical cross-sectional view showing an intermediate portion of the angle fastening tool 1B according to the seventh embodiment. Fig. 47 is a vertical cross-sectional view explaining the vertical positional relationship of each part of the angle fastening tool 1B according to the seventh embodiment.

[0368] Next, the positional relationship of each part of the angle fastening tool 1B according to the seventh embodiment will be described with reference to Figures 45 to 48. First, the positional relationship of each part in the up-down direction will be described.

[0369] 45 , in the seventh embodiment, as in the first embodiment, the lower end 14B of the trigger lever 14 is positioned closer to the underside 21P of the motor housing 21 in the up-down direction than the lower end of the tool holder 51. The underside 21P of the motor housing 21 is positioned higher than the lower end of the tool holder 51. The vertical distance H2 from the lower end 14B of the trigger lever 14 to the underside 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 tool holder 51. The lower end 14B of the trigger lever 14 may be positioned higher than the underside 21P of the motor housing 21.

[0370] As shown in FIG. 46 , the trigger lever 14 includes a pressing surface 301 that is pressed when the trigger lever 14 is pulled. The trigger lever 14 also includes a pivot 302 that rotates the pressing surface 301 when pressed. The pressing surface 301 is an exposed portion of the trigger lever 14 that is not covered by the housing 2 and is the surface that is pressed with a finger. The pivot 302 is a columnar member that extends left and right to the rear of the cross section shown in FIG. 46 . The pivot 302 is rotatably supported by the housing 2. The pivot 302 and the pressing surface 301 are connected by a pivot arm 303. When the pressing surface 301 is pressed upward by a pulling operation, the trigger lever 14 rotates around the pivot 302 toward the switch main body 14A, and the switch main body 14A is operated.

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

[0372] Specifically, the pressing surface 301 has a first end 301A, a second end 301B, and an intermediate portion 301C. The first end 301A is located at the lower end 14B of the trigger lever 14. The second end 301B is the end opposite (forward of) the first end 301A. The portion of the trigger lever 14 forward of the second end 301B is covered by the housing 2. The intermediate portion 301C is the portion between the first end 301A and the second end 301B. The intermediate portion 301C is a concave portion that curves upward. The intermediate portion 301C curves further upward than the first end 301A and the second end 301B. By curving the intermediate portion 301C deeper upward than the first end 301A and the second end 301B, it becomes easier to hold a finger on the pressing surface 301.

[0373] 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 unlikely to protrude below the lower surface 21P of the motor housing portion 21.

[0374] 45 to 47 show an example in which a smaller battery 325 than that shown in Fig. 4 is attached to the battery holder 23. In this case, the lower end 14B of the trigger lever 14 is located higher than the lower surface of the battery 325. The lower surface of the battery 325 is located lower than the lower end 14B of the trigger lever 14 and higher than the lower end of the tool holder 51.

[0375] 47 , the lower end 14B of the trigger lever 14 is located above a straight line 311 that connects the lower end of the tool holder 51 and the rear end of the underside of the battery 325. The straight line 311 that connects the lower end of the tool holder 51 and the rear end of the underside of the battery 325 is a portion that may come into contact with the installation surface when the angle fastening tool 1B is installed facing downward on an installation surface such as a workbench. By having the lower end 14B of the trigger lever 14 located above the straight line 311, the trigger lever 14 is less likely to come into contact with the installation surface or an object on the installation surface even when the angle fastening tool 1B is placed with the tool holder 51 facing downward.

[0376] 47 , the operation panel 16 is located below a line 312 connecting the front upper end position UF, which is the uppermost position of the motor housing 21 and the case 4, with the rear upper end position UR, which is the uppermost position of the grip portion 22 and the battery holding portion 23. The line 312 connecting the front upper end position UF and the rear upper end position UR is a portion that may come into contact with the installation surface when the angle fastening tool 1B is placed facing upward on an installation surface such as a workbench. The operation panel 16 is exposed on the upper surface of the motor housing 21. By positioning the operation panel 16 below the line 312, the operation panel 16 is less likely to come into contact with the installation surface or an object on the installation surface, even when the angle fastening tool 1B is placed with the tool tip holding portion 51 facing upward.

[0377] 47, the front upper end position UF is the upper surface near the connection point between the motor housing portion 21 and the case 4. In the example of FIG. 47, the rear upper end position UR is the upper surface of the battery holding portion 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 diagonally above and behind. 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 a rear upper end position UR. Because the dome-shaped portion 23A bulges upward, the upper surface (rear upper end position UR) of the battery holding portion 23 is positioned higher than 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 unlikely to come into contact with the installation surface or an object on the installation surface even when the angle fastening tool 1B is placed in a position where the tip tool holding part 51 faces upward.

[0380] 47, the controller 18 is disposed rearward of the switch board 16C. The controller 18 is disposed in the battery holding portion 23. The controller 18 is disposed inside the dome-shaped portion 23A. The internal space of the dome-shaped portion 23A is large in the vertical direction. Therefore, even if the controller 18 is equipped with a tall electronic component 18H such as a discrete capacitor, it is possible to ensure sufficient installation space for the controller 18.

[0381] Next, the positional relationship of each part in the front-rear direction will be described.

[0382] 46 , in the seventh embodiment, as in the first embodiment, the switch board 16C is disposed in front of the trigger lever 14 at a position that overlaps with the motor 6 in the up-down direction. The front end 16F of the switch board 16C overlaps with the rear portion of the motor 6 in the up-down direction, and the rear end 16R of the switch board 16C overlaps with the front portion of the trigger lever 14 in the up-down direction. The switch board 16C extends in the front-to-rear direction and is disposed so as to straddle a position above the motor 6 and a position above the trigger lever 14.

[0383] A front end 16F of the switch board 16C is disposed forward of the rear end of the motor 6. The front end 16F of the switch board 16C is disposed forward of the rear bearing 38R. The rear end 16R of the switch board 16C is disposed rearward of the front surface of the trigger lever 14.

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

[0385] Furthermore, in the front-to-rear direction, a distance L11 from the center of the rotation shaft 302 to the operation button 16A is smaller than a distance L12 from the center of the rotation shaft 302 to the rear end (i.e., the first end 301A) of the pressing surface 301. Because the operation button 16A and the trigger lever 14 are disposed close to each other in the front-to-rear direction, operability is improved, for example, both the operation button 16A and the trigger lever 14 can be operated with one hand.

[0386] FIG. 49 is a vertical cross-sectional view illustrating the positional relationship in the front-rear direction of each part of an angle fastening tool 1B according to the seventh embodiment.

[0387] It is expected that the angle fastening tool 1B used for work in narrow spaces will be fastened by the worker holding the angle fastening tool 1B at a position away from the body with the tip tool holding portion 51 facing in various directions. Compared to a pistol-type power tool, it is desirable that the angle fastening tool 1B be easy to operate even when fastening work is performed at any angle and in any direction.

[0388] FIG. 49 shows the center of gravity (CG) of the angle fastening tool 1B with the battery 325 attached. In the angle fastening tool 1B, the motor 6 and the components housed in the case 4 forward of the motor 6 (the reduction mechanism 7, spindle 8, impact mechanism 9, and anvil 10), including the case 4, are primarily made of metal, resulting in a heavy load at the front. On the other hand, the angle fastening tool 1B holds the battery 325, which is a heavy load, in the battery holder 23 at the rear end. The grip 22, trigger lever 14, and other components located between the battery 325 and the motor 6 are relatively light, so they have little effect on the center of gravity (CG). Therefore, the center of gravity (CG) is likely to be biased toward the front where heavy loads are concentrated, and the center of gravity (CG) is likely to be located away from the grip 22 (trigger lever 14). The farther the center of gravity CG is from the grip portion 22 (trigger lever 14), the more force is required to change and maintain the position of the angle fastening tool 1B, and the operability (ease of handling) of the angle fastening tool 1B decreases.

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

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

[0391] In Figure 49, the center of gravity CG is located between the front end of the motor 6 and the lower end 14B of the trigger lever 14 (inside the range 330) in the front-to-rear direction. Specifically, with the battery 325 attached, the center of gravity CG is located between the front end 16F and the rear end 16R of the switch board 16C in the front-to-rear direction. In other words, with the battery 325 attached, the center of gravity CG is located rearward of the front end 16F of the switch board 16C in the front-to-rear direction. The center of gravity CG is located forward of the rear end 16R of the switch board 16C in the front-to-rear direction. In the example of Figure 49, with the battery 325 attached, the center of gravity 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 smaller than the battery 25 in Figure 4. Because the battery 325 is heavier than the battery 25, the center of gravity CG shifts rearward in the case of Figure 4. Even when the battery 25 in Figure 4 is attached, the center of gravity CG is located forward of the trigger lever 14 in the front-to-rear direction. When the battery 25 in Figure 4 is attached, the center of gravity CG is closer to the trigger lever 14 than the position shown in Figure 49.

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

[0394] FIG. 50 is a cross-sectional view of the grip portion 22 according to the seventh embodiment, as viewed from the front. FIG. 50 shows a cross-section of the narrowest part 22N of the grip portion 22. As shown in FIG. 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 toward the upper and lower ends. The cross-sectional shape of the grip portion 22 also has a maximum up-down dimension (width W11) at the center in the left-right direction, and the up-down dimension decreases toward the right and left ends. The outer periphery of the grip portion 22 is formed by a smooth curve, with no corners. This allows the grip portion 22 to fit snugly in the hand when the operator holds it, enabling a stable grip.

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

[0396] In the above configuration, the switch board 16C can be moved closer to the motor 6 in the front-to-rear direction to a position where the switch board 16C overlaps the motor 6 in the up-down direction. Accordingly, the trigger lever 14 can also be positioned near the rear of the switch board 16C. By moving the switch board 16C, motor 6, and trigger lever 14 closer to each other in the front-to-rear 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.

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

[0398] In the above configuration, the switch board 16C, the motor 6, and the trigger lever 14 can be positioned close to each other in the front-rear 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 the switch.

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

[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 locating the motor 6, which is a heavy component, close to the trigger lever 14, the center of gravity CG of the angle fastening tool 1 can be brought closer to the trigger lever 14. This makes it easier to move the tool tip holder 51, 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 a wire and is disposed behind the switch board 16C.

[0402] In the above configuration, by arranging the controller 18 behind the switch board 16C, it is not necessary to arrange 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 reduced in the front-to-rear direction.

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

[0404] In the above configuration, the battery holder 23 to which the battery 325 is attached can be used to ensure storage space for the controller 18. Even when the controller 18 is disposed behind the switch board 16C, the overall length of the angle fastening tool 1 can be prevented from increasing.

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

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

[0407] In the seventh embodiment, the switch board 16C has an operation button 16A. The trigger lever 14 includes a pressing surface 301 that is pressed when pulled, and a rotation shaft 302 that rotates the pressing surface 301 as the trigger lever 14 is pressed. In the front-rear direction, the distance from the center of the rotation shaft 302 to the operation button 16A is shorter than the distance from the center of the rotation 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, when the operator holds 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 closer to each other in the front-rear direction, thereby 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, making the angle fastening tool 1 easier to handle.

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

[0412] In the above configuration, the lower end of the angle fastening tool 1, on which the spindle 8 is arranged, can be placed in front of the work area to perform fastening.

[0413] In the seventh embodiment, the angle fastening tool 1 includes 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. A tool holder 51 is disposed at the lower end of the anvil 10.

[0414] With the above configuration, even the angle fastening tool 1, which is suitable for work in tight spaces, can be an impact tool that can achieve a high tightening torque by striking with the hammer 47. Even when the hammer 47 is located on the front end side of the angle fastening tool 1, the switch board 16C, motor 6, and trigger lever 14 can be brought closer in the front-rear direction, resulting in good weight balance and improved maneuverability.

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

[0416] In the above configuration, the controller 18 is disposed behind the motor 6, the switch board 16C, and the trigger lever 14. Because the switch board 16C is disposed near the surface of the housing, the controller 18 is not disposed near the switch board 16C between the motor 6 and the trigger lever 14, thereby shortening the distance between the motor 6 and the trigger lever 14. Because the switch board 16C, the motor 6, and the trigger lever 14 can be disposed closer to each other in the front-to-rear direction, the operability of the trigger lever 14 and the switches can be improved while reducing the overall length of the angle fastening tool 1. 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 that is rotatable relative to the stator 26. The angle fastening tool 1 includes bearings (38F, 38R) that are disposed on the front and rear sides of the rotor 27 and rotatably support the rotor 27. The front end 16F of the switch board 16C is disposed forward of the rear bearing 38R.

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

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

[0420] In the above configuration, the switch board 16C overlaps the motor 6 in the vertical direction, which 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 that is connected to the rear end of the grip portion 22 and that detachably holds a battery 325. When the battery 325 is attached to the angle fastening tool 1, the center of gravity CG 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, the center of gravity CG of the angle fastening tool 1 is located close to the location where it is gripped and operated, improving the operability of the angle fastening tool 1. In addition, it is easy to stabilize the position of the tip tool holding part 51 during fastening work.

[0423] (Modification) In the above embodiment, the operation panel 16 is arranged so as to overlap the motor 6 in the vertical direction, but this is not limited to this. Fig. 51 is a vertical cross-sectional view showing a modification of the arrangement of the operation panel 16. Fig. 51 shows a vertical cross-section of the battery holding portion 23.

[0424] In the modified example shown in FIG. 51 , the operation panel 16 is provided on the battery holding portion 23. The operation panel 16 is exposed to the outside on the upper surface of the battery holding portion 23. The operation panel 16 is arranged on the side of the battery holding portion 23 opposite the grip portion 22. The operation panel 16 is provided on the dome-shaped portion 23A of the battery holding portion 23. The operation panel 16 is arranged on the rear slope of the upper surface of the dome-shaped portion 23A that bulges upward. The operation buttons 16A and indicator display 16B of the operation panel 16 are arranged inside a panel opening that penetrates the dome-shaped portion 23A. A switch board 16C is provided to cover the panel opening.

[0425] The switch board 16C vertically overlaps the controller 18 disposed 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 disposed between the front end and the rear end of the controller 18. The switch board 16C and the controller 18 vertically overlap the battery 325 held in the battery holding portion 23.

[0426] DESCRIPTION OF SYMBOLS 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...Cover portion, 4F...Case flange portion, 4H...Boss portion, 4S...Screw, 6...Motor, 7...Reduction mechanism portion, 8...Spindle, 8A...Flange portion, 8B...Spindle shaft portion, 8C...Spindle gear, 8D...Cylindrical portion, 8F...Spindle groove, 9...Striking mechanism, 10...Anvil, 10A...Anvil shaft portion, 10B...Anvil protrusion portion, 10C...Anvil recess portion, 12...Fan , 13...battery mounting portion, 14...trigger lever, 14A...switch body, 14B...lower end portion, 15...forward / reverse switching lever, 16...operation panel, 16A...operation button, 16B...indicator display, 16C...switch board, 16D...switch plate, 16E...connection terminal portion, 16F...front end portion, 16R...rear end portion, 17...light unit, 18...controller, 18H...electronic components, 19...intake port, 20...exhaust port, 21...motor housing portion, 21A...rear holding portion, 21B...panel opening, 21C...holding groove, 21D...lower opening, 21E...annular rib, 21F...housing flange portion, 21G...support wall, 21H...screw insertion hole, 21J...projection portion, 21N...final portion, 21P...undersurface, 22...grip portion, 22A...grip, 22N...final portion, 23...battery holding portion, 23A...dome-shaped portion, 25...battery, 25A...engagement hook, 26...stator, 27...rotor, 28...stator core, 29...front insulator, 30...rear insulator, 31...coil, 32...rotor core portion, 33...rotor shaft portion, 34...rotor magnet, 35...bevel gear, 37...sensor board, 38F...bearing, 38R...bearing, 41...first reduction gear portion, 41 A...driven gear, 41B...first intermediate gear, 41C...first intermediate shaft, 41D...intermediate bearing, 42...second reduction portion, 42A...second intermediate gear, 42B...second intermediate shaft, 42C...intermediate bearing, 44...spindle bearing, 45...washer, 46...anvil bearing, 46A...groove, 46B...sealing member, 47...hammer, 47A...hammer groove, 47B...hammer protrusion, 47C...recess, 47D...body portion, 47E...sliding surface, 48...ball, 49...coil spring, 50...ball, 51...tool holder, 52...washer, 53...light emitter, 54...substrate, 55...bank,56...Fluorescent material, 57...Optical member, 57A...Outer cylinder portion, 57B...Inner cylinder portion, 57C...Light transmitting portion, 57D...Convex portion, 58...Molded resin, 59...Buffer member, 60...Light cover, 60S...Screw, 61...Light emitting body holding portion, 61A...Peripheral wall portion, 61B...Latching portion, 61H...Boss portion, 62...Cover portion, 62A...Claw portion, 63...Cover recess, 65...Lead wire, 65A...First lead wire, 65B...Second lead wire, 66...Connector, 66A...Connector, 66B...Connector, 67...Earth wiring, 70...Screw, 71...Inner ring, 72...Outer ring, 73...Ball, 81...Placement surface, 81A...Screw hole, 82...Cylinder shaped portion, 83... guide projection, 84... groove portion, 84A... passage portion, 84B... ground terminal, 85... accommodating recess, 85A... radial support surface, 85B... front support surface, 85C... O-ring, 85D... groove, 86... outer cylindrical portion, 87... inner cylindrical portion, 88... hole portion, 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... central opening, 93... recess, 94... rear support surface, 101... outer peripheral portion, 102... inner peripheral portion, 103... outer peripheral mounting portion, 104... inner peripheral mounting portion, 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...accommodating recess, 118A...radial support surface, 118B...front support surface, 119...front accommodating section, 120...rear accommodating section, 121...first accommodating chamber, 122...second accommodating chamber, 135...bevel gear, 139...bearing, 151...support surface, 152...convex portion, 161...upper surface, 162...lower surface, 163...first notch portion, 164...second notch portion, 165...plate portion, 166A...intermediate portion, 166B...tip portion, 166...first engaging claw, 167...second Engagement claw, 167A...middle portion, 167B...tip portion, 167C...guide surface, 168...switch label, 170...switch hole, 171...indicator hole, 172...periphery portion, 173...center portion, 174...pressing portion, 175...top surface, 176...corner portion, 201...light unit, 202...substrate, 203...optical member, 203A...side wall portion, 203B...light transmitting portion, 203C...convex portion, 203D...shoulder portion, 204...light cover, 205...light emitting body holding portion, 205A...opening portion, 205B...insertion hole, 206...cover portion, 211...mounting surface, 211A...screw hole, 212...groove portion, 213...light source arrangement portion,214...guide wall, 214A...guide groove, 221...first portion, 222...second portion, 223...third portion, 224...first partition wall, 225...second partition wall, 301...pressure surface, 301A...first end portion, 301B...second end portion, 301C...intermediate portion, 302...rotation axis, 303...rotation 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. An angle fastening tool comprising: a grip portion extending in a front-to-rear direction; a motor housing portion located in front of the grip portion; a motor located inside the motor housing portion; a spindle located in front of the motor, extending in a direction intersecting the front-to-rear direction, and rotated by the motor; a tool holder rotated by the spindle; a trigger lever provided on the grip portion; and a switch board located in front of the trigger lever in a position overlapping with the motor in the up-down direction.

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

3. The angle fastening tool according to claim 1, wherein the motor has a stator and a rotor rotatable relative to the stator, and further comprises bearings arranged on the front and rear sides of the rotor, respectively, for rotatably supporting the rotor, and the distance in the front-to-rear direction between the trigger lever and the rear-side bearing is shorter than the length of the switch board in the front-to-rear direction.

4. The angle fastening tool according to claim 1, further comprising a controller connected to the switch board via a wire and disposed behind the switch board.

5. The angle fastening tool according to claim 4, further comprising a battery holding part connected to a rear end of the grip part and detachably holding a battery, and the controller is disposed in the battery holding part.

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

7. The angle fastening tool according to claim 1, wherein the switch board has an operation button, the trigger lever includes a pressing surface that is pressed when pulled, and a rotating shaft that rotates the pressing surface as it is pressed, and the distance from the center of the rotating shaft to the operation button in the front-to-rear direction is shorter than the distance from the center of the rotating shaft to the rear end of the pressing surface.

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

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

10. The angle fastening tool according to claim 1, further comprising: a hammer that moves relative to the spindle; and an anvil that is struck directly or indirectly in a rotational direction by the hammer, and the tool holder is disposed at the lower end of the anvil.

11. The angle fastening tool according to claim 1, further comprising: a housing including the grip portion and the motor housing portion; and an operation panel including 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, wherein the housing has a panel opening in which the switch plate is disposed and a retaining groove formed on an inner surface of the housing, and the switch board is retained in the housing by inserting a portion of the switch board into the retaining groove.

12. An angle fastening tool comprising: a grip portion extending in the front-to-rear direction; a motor housing portion located in front of the grip portion; a motor located inside the motor housing portion; a spindle located in front of the motor, extending in a direction intersecting the front-to-rear direction, and rotated by the motor; a tool holder portion rotated by the spindle; a trigger lever provided on the grip portion; a switch board having a switch provided thereon; and a controller connected to the motor, the switch board, and the trigger lever via wiring, wherein the motor, the switch board, the trigger lever, and the controller are arranged in this order from front to rear.

13. The angle fastening tool according to claim 12, wherein the motor has a stator and a rotor rotatable relative to the stator, and further comprises bearings disposed on the front and rear sides of the rotor, respectively, for rotatably supporting the rotor, and the front end of the switch board is disposed forward of the rear bearing.

14. The angle fastening tool according to claim 13, wherein a front end of the switch board is disposed forward of a rear end of the motor.

15. The angle fastening tool according to claim 12, further comprising a battery holding part connected to a rear end of the grip part and detachably holding a battery, and the controller is disposed in the battery holding part.

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

17. The angle fastening tool according to claim 12, further comprising a battery holding section connected to the rear end of the grip section and detachably holding a battery, wherein when the battery is attached, the center of gravity is located between the front end and the rear end of the switch board in the front-to-rear direction.

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