Angle fastening tool

Abstract

To improve the operability of angle fastening tools. [Solution] The angle fastening tool comprises a grip portion extending in the front-rear direction, a motor housing portion positioned in front of the grip portion, a motor positioned inside the motor housing portion, a spindle positioned in front of the motor and extending in a direction intersecting the front-rear direction and rotated by the motor, a case housing the spindle, a tip tool holder portion protruding downward from the lower surface of the case and rotated by the spindle, and a trigger lever provided to protrude downward from the lower surface of the grip portion. In the vertical direction, the lower end of the trigger lever is positioned closer to the lower surface of the motor housing portion than the lower end of the tip tool holder portion.

Description

Technical Field

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

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

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

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

Means for Solving the Problems

[0006] This specification discloses an angle fastening tool. The angle fastening tool may include a grip portion extending in the front-rear direction, a motor housing portion positioned in front of the grip portion, a motor positioned inside the motor housing portion, a spindle positioned in front of the motor and extending in a direction intersecting the front-rear direction and rotated by the motor, a case housing the spindle, a tip tool holder portion protruding downward from the lower surface of the case and rotated by the spindle, and a trigger lever provided to protrude downward from the lower surface of the grip portion. In the vertical direction, the lower end of the trigger lever may be positioned closer to the lower surface of the motor housing portion than the lower end of the tip tool holder portion. [Effects of the Invention]

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

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

[0009] In one or more embodiments, the angle fastening tool may include a grip portion extending in the front-rear direction, a motor housing portion positioned in front of the grip portion, a motor positioned inside the motor housing portion, a spindle positioned in front of the motor and extending in a direction intersecting the front-rear direction and rotated by the motor, a case housing the spindle, a tip tool holder portion protruding downward from the lower surface of the case and rotated by the spindle, and a trigger lever provided to protrude downward from the lower surface of the grip portion. In the vertical direction, the lower end of the trigger lever may be positioned closer to the lower surface of the motor housing portion than the lower end of the tip tool holder portion.

[0010] In the above configuration, the lower end of the trigger lever is positioned closer to the bottom surface of the motor housing than the lower end of the tip tool holder in the vertical direction. This prevents the trigger lever from protruding too far downward and positions it closer to the fingers gripping the grip, improving operability when the operator holds the grip. Furthermore, when inserting the angle fastening tool into a confined space, the trigger lever or the fingers on the trigger lever are less likely to come into contact with surrounding structures, reducing the possibility of unintentional operation. As a result, the operability of the angle fastening tool can be improved.

[0011] In one or more embodiments, the trigger lever may include a pressing surface that is pressed when pulled. The pressing surface may extend to the lower end of the trigger lever and may be concavely curved.

[0012] In the above configuration, the concave shape of the pressing surface makes it easier to place your fingers on the trigger lever, improving operability.

[0013] In one or more embodiments, the pressing surface may have a first end located at the lower end of the trigger lever, a second end opposite to the first end, and a concave intermediate portion that curves upward above the first and second ends.

[0014] In the above configuration, the middle section curves concavely to a deeper position above the first and second ends, allowing fingers to fit comfortably in the middle section, stabilizing their position and reducing the likelihood of misalignment. This enables accurate operation of the trigger lever even when working with the angle fastening tool in confined spaces.

[0015] In one or more embodiments, the grip portion may have the grip located behind the trigger lever. The intermediate portion may be located above the lower surface of the motor housing portion and below the lower surface of the grip.

[0016] In the above configuration, the intermediate section is positioned above the lower surface of the motor housing, so even when working with an angle fastening tool in a confined space, the trigger lever and the fingers on the trigger lever can be effectively prevented from coming into contact with surrounding structures. In addition, the intermediate section is close to the grip, making it easy to pull the trigger lever.

[0017] In one or more embodiments, the angle fastening tool may further include a battery holder connected to the rear end of the grip portion for detachably holding the battery. The lower end of the trigger lever may be positioned above the bottom surface of the battery.

[0018] In the above configuration, the lower end of the trigger lever is positioned above the bottom surface of the battery, effectively preventing the trigger lever or the fingers resting on it from coming into contact with surrounding structures.

[0019] In one or more embodiments, the lower end of the trigger lever may be located above the line connecting the lower end of the tip tool holder and the rear end of the lower surface of the battery.

[0020] In the above configuration, when the angle fastening tool is installed facing downwards on a workbench or other surface, the lower end of the trigger lever can be prevented from coming into contact with the installation surface. Therefore, unintentional operation of the trigger lever can be suppressed.

[0021] In one or more embodiments, the angle fastening tool may further include a battery holder connected to the rear end of the grip portion for detachably holding a battery. With the battery installed, the center of gravity of the angle fastening tool may be closer to the lower end of the trigger lever than to the tip tool holder portion in the front-rear direction.

[0022] In the above configuration, the center of gravity of the angle fastening tool is closer to the trigger lever during use, making it easier to move the tip of the angle fastening tool. Furthermore, even when fastening in various positions, such as when the angle fastening tool is facing upwards (with the tip tool holder facing upwards), the center of gravity is close to the user's hand, allowing for stable gripping and maintenance of the correct posture.

[0023] In one or more embodiments, the center of gravity of the angle fastening tool may be located between the front end of the motor and the lower end of the trigger lever in the front-rear direction.

[0024] In the above configuration, the center of gravity of the angle fastening tool can be brought sufficiently close to the trigger lever. Also, since the center of gravity is not located behind the trigger lever, it is easier to stabilize the position of the tool holder during fastening work.

[0025] In one or more embodiments, the front-to-back distance between the trigger lever and the motor may be smaller than the front-to-back distance between the trigger lever and the battery holder.

[0026] In the above configuration, the trigger lever is closer to the motor, making it easy to bring the center of gravity of the trigger lever and the angle fastening tool closer together.

[0027] In one or more embodiments, the angle fastening tool may include a grip portion extending in the front-rear direction, a motor housing portion positioned in front of the grip portion, a motor positioned inside the motor housing portion, a spindle positioned in front of the motor and extending in a direction intersecting the front-rear direction and rotated by the motor, a case housing the spindle, a tip tool holder portion protruding downward from the lower surface of the case and rotated by the spindle, and a trigger lever provided to protrude downward from the lower surface of the grip portion. The circumference of the narrowest part of the grip portion may be smaller than the circumference of the narrowest part of the motor housing portion.

[0028] In the above configuration, the circumference of the narrowest part of the grip is smaller than the circumference of the narrowest part of the motor housing. This prevents the grip from becoming too thick, making it easier to grip and improving operability when the operator holds the grip. Because the grip is thin, the trigger lever on the grip is less likely to protrude outward from the motor housing (or the amount of protrusion is small). Therefore, when inserting the angle fastening tool into a narrow space, the trigger lever or the fingers on the trigger lever are less likely to come into contact with surrounding structures, reducing the possibility of unintentional operation. As a result, the operability of the angle fastening tool can be improved.

[0029] In one or more embodiments, the cross-section of the grip portion perpendicular to the front-to-back direction may have a width in the left-to-right direction that is smaller than the width in the up-to-down direction.

[0030] The above configuration allows for a cross-sectional shape that is easy to grip and fits comfortably in the hand when holding the grip. Improved grip leads to enhanced operability of the angle fastening tool.

[0031] In one or more embodiments, the angle fastening tool may further include a battery holder connected to the rear end of the grip portion for detachably holding a battery. The lower end of the trigger lever may be positioned above the line connecting the lower end of the tip tool holder and the rear end of the underside of the battery.

[0032] In the above configuration, when the angle fastening tool is installed facing downwards on a workbench or other surface, the lower end of the trigger lever can be prevented from coming into contact with the installation surface. Therefore, unintentional operation of the trigger lever can be suppressed.

[0033] In one or more embodiments, the angle fastening tool may further include a battery holder connected to the rear end of the grip portion for detachably holding a battery. With the battery installed, the center of gravity may be closer to the trigger lever than to the tip tool holder portion in the front-rear direction.

[0034] In the above configuration, the center of gravity of the angle fastening tool is closer to the trigger lever during use, making it easier to move the tip of the angle fastening tool. Furthermore, even when fastening in various positions, such as when the angle fastening tool is facing upwards (with the tip tool holder facing upwards), the center of gravity is close to the user's hand, allowing for stable gripping and maintenance of the correct posture.

[0035] In one or more embodiments, the center of gravity of the angle fastening tool may be located between the front end of the motor and the lower end of the trigger lever in the front-rear direction.

[0036] In the above configuration, the center of gravity of the angle fastening tool is closer to the trigger lever during use, making it easier to move the tip of the angle fastening tool. This also makes it easier to maintain the angle fastening tool's position even when performing fastening work in various postures.

[0037] In one or more embodiments, the angle fastening tool may further include a battery holder connected to the rear end of the grip portion and for detachably holding the battery, and an operating panel exposed on the upper surface of the motor housing portion. The operating panel may be located below a line connecting the uppermost front end position of the motor housing portion and case and the uppermost rear end position of the grip portion and battery holder portion.

[0038] In the above configuration, when the angle fastening tool is installed facing upwards (with the tool holder facing upwards) on a workbench or other surface, the control panel can be prevented from coming into contact with the installation surface. Therefore, unintentional operation of the control panel can be suppressed.

[0039] In one or more embodiments, the angle fastening tool may further include a controller connected via wiring to an operating panel. The battery holder may have a dome-shaped portion that bulges upward, including the rear upper end position. The controller may be located inside the dome-shaped portion.

[0040] In the above configuration, by providing a dome-shaped section in the battery holder, a rear upper end position is formed to prevent the control panel from coming into contact with the mounting surface, while also providing space to house the controller using the dome-shaped section. Even if the controller has tall electronic components, it can be housed without any problems.

[0041] The embodiments will be described below with reference to the drawings. In the embodiments, the positional relationships of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate the relative position or direction with respect to the center of the angle fastening tool.

[0042] [First Embodiment] Figure 1 is a perspective view showing the angle fastening tool 1 according to the embodiment. Figure 2 is a side view showing the angle fastening tool 1 according to the embodiment. Figure 3 is a bottom view showing the angle fastening tool 1 according to the embodiment. Figure 4 is a longitudinal cross-sectional view showing the angle fastening tool 1 according to the embodiment. Figure 5 is a longitudinal cross-sectional view showing the motor housing portion 21 of the angle fastening tool 1 according to the embodiment. Figure 6 is a longitudinal cross-sectional view showing the case 4 of the angle fastening tool 1 according to the embodiment. Figure 7 is a cross-sectional view of the angle fastening tool 1 according to the embodiment in the left-right direction along the anvil 10.

[0043] In this embodiment, the angle fastening tool 1 is an electric tool having an electric motor 6 as a power source. The direction parallel to the rotation axis AX of the motor 6 is appropriately referred to as the axial direction, the direction that circles around the rotation axis AX is appropriately referred to as the circumferential direction or rotational direction, and the radial direction of the rotation axis AX is appropriately referred to as the radial direction. Furthermore, in the radial direction, the position close to or approaching the rotation axis AX is appropriately referred to as the radially inner or inner circumferential side, and the position far from or moving away from the rotation axis AX is appropriately referred to as the radially outer or outer circumferential side. In this embodiment, the rotation axis AX extends in the front-rear direction. One side in the axial direction is the front side, and the other side in the axial direction is the rear side.

[0044] In this embodiment, the angle fastening tool 1 is an angle impact wrench. The angle fastening tool 1 comprises a housing 2, a case 4, a motor 6, a reduction gear 7, a spindle 8, a striking mechanism 9, an anvil 10, a fan 12, a battery mounting section 13, a trigger lever 14, a forward / reverse switching lever 15, an operation panel 16, a light unit 17, and a controller 18.

[0045] Housing 2 is made of synthetic resin. Housing 2 consists of a pair of split housings, left and right. The pair of split housings are fixed together by multiple screws 2S.

[0046] The housing 2 includes a motor housing section 21, a grip section 22, and a battery holding section 23.

[0047] The motor housing section 21 constitutes the front part of the housing 2. The motor housing section 21 is positioned in front of the grip section 22. The motor housing section 21 is cylindrical. The motor housing section 21 houses the motor 6. The motor housing section 21 houses the motor 6, the fan 12, and the bearing 38R. The operation panel 16 is provided on the upper part of the motor housing section 21.

[0048] The grip portion 22 extends in the front-rear direction. The grip portion 22 extends rearward from the motor housing portion 21. The grip portion 22 is held by the operator. The grip portion 22 is provided with a trigger lever 14 and a grip 22A. The trigger lever 14 is located at the front of the grip portion 22. The trigger lever 14 is located at the front end of the grip portion 22. The trigger lever 14 is located at the bottom of the grip portion 22. The grip 22A is located rearward from the trigger lever 14. The grip 22A is columnar. The grip 22A is the part of the grip portion 22 that is held by the operator. The grip 22A is longer in the front-rear direction than the trigger lever 14. The lower surface of the grip 22A is located above the lower surface 21P of the motor housing portion 21.

[0049] As shown in Figure 2, the circumference of the narrowest part 22N of the grip portion 22 is smaller than the circumference of the narrowest part 21N of the motor housing portion 21. The circumference of the narrowest part 22N of the grip portion 22 is, for example, 150 mm or less, preferably 140 mm or less, more preferably 130 mm or less, and even more preferably 120 mm or less. In the example of Figure 3, the narrowest part 22N of the grip portion 22 is the rear end of the grip portion 22 (the connection part with the battery holding portion 23), and the circumference of the grip portion 22 is, for example, 115 mm. The circumference of the narrowest part 21N of the motor housing portion 21 is, for example, 200 mm or less, preferably 180 mm or less, more preferably 160 mm or less, and even more preferably 155 mm or less. In the example of Figure 3, the circumference of the narrowest part 21N of the motor housing portion 21 is 200 mm.

[0050] The battery holder 23 is connected to the rear end of the grip portion 22. The battery holder 23 houses the controller 18. The battery holder 23 holds the battery 25. The battery 25 is mounted in the battery mounting portion 13 provided on the lower surface of the battery holder 23.

[0051] The motor housing section 21 has an air intake port 19 and an exhaust port 20. The air intake port 19 and the exhaust port 20 are provided on the left and right sides of the motor housing section 21. Air from the external space of the housing 2 flows into the internal space of the housing 2 through the air intake port 19. Air from the internal space of the housing 2 flows out into the external space of the housing 2 through the exhaust port 20.

[0052] The housing 2 and case 4 are aligned in the front-to-back direction. The motor housing section 21 and case 4 are connected in the front-to-back direction. The front of the housing 2 and the rear of the case 4 are connected. The housing 2 and case 4 are fixed together by screws 70.

[0053] Case 4 is connected to the front of the motor housing section 21. The motor housing section 21 is fixed to the rear of case 4. A housing flange section 21F is provided at the front end of the motor housing section 21. A case flange section 4F, on which a plurality of boss sections 4H are formed, is provided at the rear end of case 4. The case 4 and the motor housing section 21 are fixed together when a screw 70 passes through a screw insertion hole in the housing flange section 21F and connects to the boss sections 4H.

[0054] Case 4 houses the bevel gear 35, which is a pinion gear. Case 4 houses the reduction gear 7. Case 4 houses the spindle 8. Case 4 houses the striking mechanism 9, which includes the hammer 47. Case 4 houses a portion of the anvil 10. Case 4 is made of metal. In this embodiment, case 4 is made of aluminum. Case 4 is hollow and box-shaped.

[0055] Case 4 includes a case body 4A and a lid 4B. The case body 4A is a hollow box shape with openings at the rear and top. The rear of the case body 4A is connected to the motor housing portion 21 of the housing 2 and is covered by the motor housing portion 21. The top of the case body 4A is covered by the lid 4B. The lid 4B is provided on the top surface of the case body 4A, extending from the front end to just before the rear end, and is fixed to the case body 4A by screws 4S. The case 4 houses the reduction gear portion 7, spindle 8, striking mechanism 9, and anvil 10, which are assembled through the top opening of the case body 4A, and the lid 4B is attached to the case body 4A to accommodate these components.

[0056] Case 4 has a front, left and right sides, and a bottom surface, which are formed by the case body 4A. As shown in Figure 7, the bottom surface of case 4 has a flat mounting surface 81 and a cylindrical portion 82 that protrudes downward from the mounting surface 81. The mounting surface 81 is a surface that is aligned in the front-rear direction and the left-right direction. The mounting surface 81 connects the front and left and right sides of the case body 4A to the cylindrical portion 82. The light unit 17 and the light cover 60 are placed on the mounting surface 81. The mounting surface 81 is covered by the light cover 60. The cylindrical portion 82 is located near the front of the bottom surface of case 4. The cylindrical portion 82 has a cylindrical shape. The internal opening of the cylindrical portion 82 communicates with the inside of case 4. The anvil 10 passes through the cylindrical portion 82. The anvil 10 protrudes downward from the inside of case 4 through the cylindrical portion 82.

[0057] Case 4 holds a bearing 38F that rotatably supports the rotor 27 of the motor 6. A reduction gear 7 is positioned in front of the bearing 38F. A spindle 8 and a striking mechanism 9 are positioned in front of the reduction gear 7. An anvil 10 is positioned below the striking mechanism 9.

[0058] Motor 6 is the power source for the angle fastening tool 1. Motor 6 generates rotational force. Motor 6 is an electric motor. Motor 6 is an inner rotor type brushless motor. Motor 6 is housed in the motor housing section 21 of the housing 2. Motor 6 is positioned inside the motor housing section 21.

[0059] As shown in Figure 5, the motor 6 has a stator 26 and a rotor 27 that is rotatable relative to the stator 26. The stator 26 is supported by the motor housing 21. At least a portion of the rotor 27 is positioned inside the stator 26. The rotor 27 rotates relative to the stator 26. The rotor 27 rotates around a rotation axis AX that extends in the front-rear direction.

[0060] The stator 26 includes a stator core 28, a front insulator 29, a rear insulator 30, and a coil 31.

[0061] The stator core 28 is positioned radially outward from the rotor 27. The stator core 28 includes multiple laminated steel plates. The steel plates are metal plates mainly composed of iron. The stator core 28 is cylindrical. The stator core 28 has multiple teeth that support the coil 31.

[0062] The front insulator 29 is provided at the front of the stator core 28. The rear insulator 30 is provided at the rear of the stator core 28. Both the front insulator 29 and the rear insulator 30 are electrically insulating members made of synthetic resin. The front insulator 29 is positioned to cover a portion of the surface of the teeth. The rear insulator 30 is positioned to cover a portion of the surface of the teeth.

[0063] The coil 31 is mounted on the stator core 28 via a front insulator 29 and a rear insulator 30. Multiple coils 31 are arranged. The coils 31 are arranged around the teeth of the stator core 28 via the front insulator 29 and the rear insulator 30. The coils 31 and the stator core 28 are electrically isolated by the front insulator 29 and the rear insulator 30.

[0064] The rotor 27 rotates around the rotation axis AX. The rotor 27 has a rotor core portion 32, a rotor shaft portion 33, and a rotor magnet 34.

[0065] The rotor core portion 32 and the rotor shaft portion 33 are each made of steel. In this embodiment, the rotor core portion 32 and the rotor shaft portion 33 are separate components. The rotor core portion 32 and the rotor shaft portion 33 may be integrally formed. The front portion of the rotor shaft portion 33 protrudes forward from the front end surface of the rotor core portion 32. The rear portion of the rotor shaft portion 33 protrudes rearward from the rear end surface of the rotor core portion 32.

[0066] The rotor magnet 34 is fixed to the rotor core 32. The rotor magnet 34 extends forward and backward so as to penetrate the rotor core 32.

[0067] A sensor board 37 is attached to the rear insulator 30. The sensor board 37 has an annular circuit board and a magnetic sensor supported by the circuit board. At least a portion of the sensor board 37 faces the rotor magnet 34. The magnetic sensor detects the rotational position of the rotor 27 by detecting the magnetic force of the rotor magnet 34.

[0068] Bearings (38F and 38R) are positioned on the front and rear sides of the rotor 27, respectively. The bearings (38F and 38R) rotatably support the rotor 27. The rear part of the rotor shaft portion 33 is rotatably supported by bearing 38R. The front part of the rotor shaft portion 33 is rotatably supported by bearing 38F. Bearing 38R is held in the housing 2. Bearing 38R is housed in a concave rear holding portion 21A provided in the motor housing portion 21. Bearing 38F is housed in a housing recess 85 provided in the rear of the case 4. The front end of the rotor shaft portion 33 is positioned in the internal space of the case 4 through the opening on the front of the motor housing portion 21 and the opening on the rear of the case 4.

[0069] A bevel gear 35 is provided at the front end of the rotor shaft portion 33. The bevel gear 35 is a pinion gear that rotates integrally with the rotor 27. The bevel gear 35 is connected to at least a part of the reduction mechanism portion 7. The rotor shaft portion 33 is connected to the reduction mechanism portion 7 via the bevel gear 35.

[0070] As shown in Figure 6, the reduction gear 7 is connected to a bevel gear 35, which is a pinion gear. The reduction gear 7 transmits the rotational force of the motor 6 to the spindle 8 and the anvil 10. The reduction gear 7 is housed in the case 4. The reduction gear 7 has multiple gears. The reduction gear 7 is positioned in front of the motor 6. The reduction gear 7 is positioned in front of the housing recess 85. The reduction gear 7 connects the rotor shaft 33 and the spindle 8. The gears of the reduction gear 7 are driven by the rotor 27. The reduction gear 7 transmits the rotation of the rotor 27 to the spindle 8. The reduction gear 7 rotates the spindle 8 at a rotational speed lower than the rotational speed of the rotor shaft 33.

[0071] The reduction gear mechanism 7 is composed of multiple reduction gears. The reduction gear mechanism 7 includes a first reduction gear 41 and a second reduction gear 42. The first reduction gear 41 is connected to a pinion gear and rotates by reducing the rotation of the pinion gear. The second reduction gear 42 reduces the rotation of the first reduction gear 41 and transmits it to the spindle 8.

[0072] The first reduction gear 41 includes a driven gear 41A, a first intermediate gear 41B, and a first intermediate shaft 41C. The first intermediate shaft 41C extends in a direction intersecting the rotation axis AX. The first intermediate shaft 41C extends along the vertical direction perpendicular to the rotation axis AX and rotates around a central axis in the vertical direction. Both ends of the first intermediate shaft 41C are rotatably supported by intermediate bearings 41D. The intermediate bearings 41D are held in the case 4. The intermediate bearings 41D are ball bearings. The driven gear 41A and the first intermediate gear 41B are fixed to the first intermediate shaft 41C. In this embodiment, the first intermediate gear 41B and the first intermediate shaft 41C are a single unit. The first intermediate gear 41B and the first intermediate shaft 41C may be separate units. The driven gear 41A is mounted on the lower part of the first intermediate shaft 41C, and the first intermediate gear 41B is mounted on the upper part of the first intermediate shaft 41C. The driven gear 41A, the first intermediate gear 41B, and the first intermediate shaft 41C rotate as a single unit. The driven gear 41A is a bevel gear that meshes with the pinion gear, the bevel gear 35. The first intermediate gear 41B is a spur gear. The first intermediate gear 41B meshes with the second intermediate gear 42A of the second reduction unit 42.

[0073] The second reduction gear 42 is positioned in front of the first reduction gear 41. The second reduction gear 42 has a second intermediate gear 42A and a second intermediate shaft 42B. The second intermediate shaft 42B extends in a direction intersecting the rotation axis AX. The second intermediate shaft 42B extends along the vertical direction perpendicular to the rotation axis AX and rotates around a central axis in the vertical direction. The first intermediate shaft 41C and the second intermediate shaft 42B are parallel. Both ends of the second intermediate shaft 42B are rotatably supported by intermediate bearings 42C. The intermediate bearings 42C are held in the case 4. The intermediate bearings 42C are sliding bearings. The second intermediate gear 42A is fixed to the second intermediate shaft 42B. The second intermediate gear 42A is mounted on the upper part of the second intermediate shaft 42B. The second intermediate gear 42A and the second intermediate shaft 42B rotate together. The second intermediate gear 42A is a spur gear. The second intermediate gear 42A meshes with the first intermediate gear 41B. The second intermediate gear 42A rotates by reducing the rotation speed of the first intermediate gear 41B. The second intermediate gear 42A meshes with the spindle gear 8C of the spindle 8. The spindle gear 8C rotates integrally with the spindle 8. The spindle gear 8C is a spur gear.

[0074] When the rotor shaft section 33 rotates due to the drive of the motor 6, the bevel gear 35 rotates, and the bevel gear 35 rotates the driven gear 41A. Due to the rotation of the driven gear 41A, the first intermediate shaft 41C rotates at a rotational speed lower than the rotational speed of the rotor shaft section 33. When the first intermediate shaft 41C rotates, the first intermediate gear 41B rotates, and the first intermediate gear 41B rotates the second intermediate gear 42A. Due to the rotation of the second intermediate gear 42A, the second intermediate gear 42A rotates at a rotational speed lower than the rotational speed of the first intermediate shaft 41C. The second intermediate gear 42A rotates the spindle gear 8C. The spindle gear 8C rotates at a rotational speed lower than the rotational speed of the second intermediate gear 42A. As the spindle gear 8C rotates, the spindle 8 rotates. The spindle 8 rotates at a lower rotational speed than the rotational speed of the rotor shaft 33.

[0075] The spindle 8 is connected to the reduction gear 7. The spindle 8 is rotated by the motor 6. The spindle 8 is positioned in front of the motor 6. The spindle 8 is positioned in front of the stator 26. The spindle 8 is positioned in front of the rotor 27. At least a portion of the spindle 8 is positioned in front of the reduction gear 7. The spindle 8 is rotated by the rotor 27. The spindle 8 rotates due to the rotational force of the rotor 27 transmitted by the reduction gear 7.

[0076] The spindle 8 extends in a direction intersecting the front-rear direction. The spindle 8 extends downward along the rotation axis BX which is perpendicular to the front-rear direction. The spindle 8 rotates around the rotation axis BX. The rotation axis BX of the spindle 8 and the rotation axis AX of the motor 6 are non-parallel and intersect each other. The direction of the rotation axis BX of the spindle 8 may intersect the front-rear direction (i.e., the rotation axis AX) at any angle between 80 degrees and 100 degrees. In this embodiment, the spindle 8, hammer 47 and anvil 10 are arranged along the rotation axis BX and rotate around the rotation axis BX.

[0077] The spindle 8 has a flange portion 8A and a spindle shaft portion 8B that protrudes downward from the flange portion 8A. The spindle gear 8C is provided on the outer circumference of the flange portion 8A.

[0078] The spindle 8 is rotatably supported by a spindle bearing 44. The spindle bearing 44 is held in the case 4. The spindle 8 has a cylindrical portion 8D that protrudes upward from the upper part of the flange portion 8A. The spindle bearing 44 is positioned on the outer circumference of the cylindrical portion 8D. The spindle bearing 44 rotatably supports the outer circumference of the cylindrical portion 8D. The spindle bearing 44 is a sliding bearing. The lower end of the spindle shaft portion 8B is provided with a cylindrical projection that protrudes downward. The projection is positioned in an anvil recess 10C formed on the upper surface of the anvil 10. The lower part of the spindle 8 is rotatably supported by an anvil bearing 46 via the anvil 10.

[0079] The striking mechanism 9 is driven by the motor 6. The rotational force of the motor 6 is transmitted to the striking mechanism 9 via the reduction gear 7 and the spindle 8. The striking mechanism 9 strikes the anvil 10 in the rotational direction based on the rotational force of the spindle 8, which is rotated by the motor 6. As shown in Figures 6 and 7, the striking mechanism 9 has a hammer 47, a ball 48, and a coil spring 49. The striking mechanism 9, including the hammer 47, is housed in the case 4. The striking mechanism 9 is positioned between the spindle 8 and the anvil 10 in the case 4. The striking mechanism 9 is positioned below the flange portion 8A of the spindle 8.

[0080] The hammer 47 is positioned in front of the reduction gear 7. The hammer 47 is housed in the case 4. The hammer 47 is rotated by the spindle 8. The hammer 47 is positioned around the spindle shaft 8B. The hammer 47 is held by the spindle shaft 8B. The ball 48 is positioned between the spindle shaft 8B and the hammer 47. The coil spring 49 is supported by the flange 8A and the hammer 47, respectively.

[0081] The hammer 47 has a body portion 47D, a hammer groove 47A, and a hammer projection 47B (see Figure 7). The body portion 47D is arranged around the spindle shaft portion 8B. The body portion 47D is annular. A recess 47C is provided at the rear of the body portion 47D. The recess 47C is provided so as to recess forward from the rear end of the body portion 47D. The recess 47C is ring-shaped. The hammer projection 47B protrudes forward from the body portion 47D. Two hammer projections 47B are provided.

[0082] The hammer 47 is rotated by the motor 6. The rotational force of the motor 6 is transmitted to the hammer 47 via the reduction gear 7 and the spindle 8. The hammer 47 can rotate together with the spindle 8 based on the rotational force of the spindle 8, which is rotated by the motor 6. The axis of rotation of the hammer 47 and the axis of rotation BX of the spindle 8 coincide. The hammer 47 rotates around the axis of rotation BX. The hammer 47 moves relative to the spindle 8. The hammer 47 moves relative to the spindle 8 in the vertical direction.

[0083] The ball 48 is made of a metal such as steel. The ball 48 is positioned between the spindle shaft portion 8B and the hammer 47. The spindle 8 has a spindle groove 8F in which at least a portion of the ball 48 is positioned. The spindle groove 8F is provided on a portion of the outer circumferential surface of the spindle shaft portion 8B. The hammer 47 has a hammer groove 47A in which at least a portion of the ball 48 is positioned. The hammer groove 47A is provided on a portion of the inner surface of the body portion 47D. The ball 48 is positioned between the spindle groove 8F and the hammer groove 47A. The ball 48 can roll inside the spindle groove 8F and inside the hammer groove 47A, respectively. The hammer 47 is movable along with the ball 48. The spindle 8 and the hammer 47 can move relative to each other in the axial and rotational directions within the range of motion defined by the spindle groove 8F and the hammer groove 47A.

[0084] The coil spring 49 generates an elastic force that moves the hammer 47 downward. The coil spring 49 is positioned between the flange portion 8A and the hammer 47. The lower part of the coil spring 49 is positioned in a ring-shaped recess 47C provided on the rear surface of the hammer 47. A washer 45 is provided inside the recess 47C. The washer 45 is supported by the body portion 47D via a ball 50. The upper end of the coil spring 49 is supported by the flange portion 8A. The lower end of the coil spring 49 is supported by the washer 45. The hammer 47 and the coil spring 49 are able to rotate relative to each other around the rotation axis BX due to the interposition of the washer 45 and the ball 50.

[0085] The anvil 10 is the output section of the angle fastening tool 1. The anvil 10 rotates due to the rotational force of the motor 6. At least a portion of the anvil 10 is positioned below the hammer 47. The anvil 10 is struck directly or indirectly in the rotational direction by the hammer 47. In this embodiment, the anvil 10 is struck directly by the hammer 47.

[0086] The anvil 10 has a rod-shaped anvil shaft portion 10A and an anvil projection portion 10B. An anvil recess 10C is provided at the upper end of the anvil 10 to receive the projection portion of the spindle shaft portion 8B. The anvil projection portion 10B is provided at the upper end of the anvil 10. The anvil projection portion 10B protrudes radially outward from the upper end of the anvil shaft portion 10A. The anvil shaft portion 10A protrudes downward from the inside of the case 4, passing through the cylindrical portion 82, to the outside of the case 4. The lower end of the anvil shaft portion 10A is exposed to the outside of the case 4. A tip tool holder portion 51 is positioned at the lower end of the anvil 10. The tip tool holder portion 51 protrudes downward from the lower surface of the case 4. The tip tool holder portion 51 is provided on the exposed portion of the lower end of the anvil shaft portion 10A. The tip tool holder portion 51 is rotated by the spindle 8. The tip tool holder 51 is rotated by the spindle 8 via the hammer 47 and the anvil 10.

[0087] In the impact wrench according to this embodiment, the tip tool holder 51 is a rectangular prism-shaped engaging portion that engages with the engaging recess of the socket, which is the tip tool. The socket is held in a fitted state within the tip tool holder 51.

[0088] The anvil 10 is rotatably supported by an anvil bearing 46 (see Figure 7). The axis of rotation of the anvil 10 coincides with the axis of rotation BX of the spindle 8. The anvil 10 rotates around the axis of rotation BX. The anvil bearing 46 is located inside the cylindrical portion 82. The anvil bearing 46 is located inside the cylindrical portion 82 of the case 4. The anvil bearing 46 is held by the cylindrical portion 82. The cylindrical portion 82 is located around the anvil shaft portion 10A. The anvil bearing 46 rotatably supports the anvil shaft portion 10A. In this embodiment, the anvil bearing 46 is a sliding bearing. The anvil shaft portion 10A is provided with a ring-shaped groove 46A facing the anvil bearing 46. A ring-shaped sealing member 46B is located within the groove 46A. A washer 52 is also provided on the inner bottom surface of the case 4. The washer 52 faces the anvil projection 10B.

[0089] The hammer projection 47B is capable of contacting the anvil projection 10B. When the motor 6 is driven while the hammer projection 47B and the anvil projection 10B are in contact, the anvil 10 rotates together with the hammer 47 and the spindle 8.

[0090] The anvil 10 is struck in the rotational direction by the hammer 47. For example, in screw tightening work, if the load acting on the anvil 10 becomes high, there may be situations where the power generated by the motor 6 alone is insufficient to rotate the anvil 10. When the power generated by the motor 6 alone is insufficient to rotate the anvil 10, the rotation of the anvil 10 and the hammer 47 stops. The spindle 8 and the hammer 47 are relatively movable in the axial and circumferential directions, respectively, via the ball 48. Even if the rotation of the hammer 47 stops, the rotation of the spindle 8 continues due to the power generated by the motor 6. When the spindle 8 rotates while the rotation of the hammer 47 has stopped, the ball 48 moves upward, guided by the spindle groove 8F and the hammer groove 47A, respectively. The hammer 47 receives force from the ball 48 and moves upward along with the ball 48. In other words, the hammer 47 moves upward as the spindle 8 rotates while the rotation of the anvil 10 has stopped. As the hammer 47 moves upward, contact between the hammer projection 47B and the anvil projection 10B is released.

[0091] The coil spring 49 generates an elastic force that moves the hammer 47 downward. The hammer 47, having moved upward, moves downward due to the elastic force of the coil spring 49. As the hammer 47 moves downward, it receives a rotational force from the ball 48. That is, the hammer 47 moves downward while rotating. As the hammer 47 moves downward while rotating, the hammer projection 47B comes into contact with the anvil projection 10B while rotating. As a result, the anvil projection 10B is struck in the rotational direction by the hammer projection 47B. The anvil 10 is subjected to both the power of the motor 6 and the inertial force of the hammer 47. Therefore, the anvil 10 can rotate around the rotation axis BX with high torque.

[0092] The fan 12 rotates due to the rotational force of the motor 6. As shown in Figure 5, the fan 12 is positioned in front of the stator 26 of the motor 6. The fan 12 generates an airflow to cool the motor 6. The fan 12 is fixed to at least a portion of the rotor 27. The fan 12 is fixed to the front of the rotor shaft portion 33. The fan 12 is positioned between the bearing 38F and the stator 26. The fan 12 rotates with the rotation of the rotor 27. As the rotor shaft portion 33 rotates, the fan 12 rotates together with the rotor shaft portion 33. As the fan 12 rotates, air from the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 19. The air that flows into the internal space of the housing 2 cools the motor 6 by circulating through the internal space of the housing 2. As the fan 12 rotates, the air that has circulated through the internal space of the housing 2 flows out into the external space of the housing 2 through the exhaust port 20.

[0093] As shown in Figures 1 and 5, the control panel 16 is provided on the motor housing 21. The control panel 16 is exposed to the outside through a panel opening 21B formed on the upper surface of the motor housing 21. The control panel 16 is positioned near the boundary between the rear of the motor housing 21 and the grip portion 22. The control panel 16 is positioned in front of the trigger lever 14. At least a portion of the control panel 16 overlaps vertically with the motor 6. At least a portion of the control panel 16 overlaps vertically with the bearing 38R.

[0094] Figure 8 is a perspective view showing the operation panel 16 according to the embodiment. In Figure 8, the right side part of the housing 2 has been removed, exposing a part of the operation panel 16. The operation panel 16 is plate-shaped. The operation panel 16 has an operation button 16A, an indicator display 16B, and a switch board 16C. The operation button 16A and the indicator display 16B are fixed to the switch board 16C via a frame-shaped bracket 16D. The bracket 16D fits into the panel opening 21B. The switch board 16C has a flat plate shape. A switch is provided on the switch board 16C. The switch is, for example, an operation button 16A, but may be a DIP switch, rocker switch, rotary switch, or other type of switch. Specifically, the switch board 16C is a circuit board on which the operation button 16A and the indicator display 16B are provided. The switch board 16C is connected to the controller 18 by wiring. The motor housing section 21 is provided with a retaining groove 21C located directly below the panel opening 21B, which supports the outer circumference of the switch board 16C. The operation panel 16 is held in the motor housing section 21 by the outer circumference of the switch board 16C fitting into the retaining groove 21C. The switch board 16C is positioned on the upper part of the motor housing section 21 and runs along the upper surface of the motor housing section 21. The operation panel 16 outputs a signal to the controller 18 in response to input from the operation button 16A, and displays information on the indicator display 16B in response to the signal from the controller 18.

[0095] When the operator operates the operation button 16A, the controller 18 switches the operating mode of the motor 6. The indicator display 16B has a light-emitting element. The light-emitting element is, for example, an LED light-emitting element. The indicator display 16B displays the operating mode of the motor 6 by changing the lighting pattern of multiple light-emitting elements. The operating modes include, for example, three different operating modes for high, medium, and low speed settings of the motor 6, a mode in which the motor 6 is stopped based on the detection that striking by the striking mechanism 9 has started, and a mode in which the motor 6 is stopped or switched to low speed rotation based on the detection of the rotation of the nut when loosening the nut.

[0096] Figure 9 is a schematic diagram showing the mounting of the battery 25 to the battery holding section 23 according to the embodiment. In Figure 9, the right side part of the housing 2 is removed, exposing the inside of the battery holding section 23. As shown in Figures 4 and 9, the battery mounting section 13 is located below the battery holding section 23. The battery 25 is mounted in the battery mounting section 13. The battery 25 is detachable from the battery mounting section 13. The battery mounting section 13 holds the battery 25 so that it can slide in the front-rear direction. When the battery 25 slides from the rear to the front of the battery mounting section 13 and reaches the engagement position, the battery mounting section 13 engages with the engagement hook 25A of the battery 25, restricting the rearward sliding movement of the battery 25. The battery 25 is provided with a release button that moves the engagement hook 25A up and down. When the release button is pressed, the engagement hook 25A retracts downward, releasing the engagement with the battery mounting section 13. This makes it possible to attach and detach the battery 25.

[0097] The battery 25 functions as a power source for the angle fastening tool 1. The battery 25 includes a secondary battery. In an embodiment, the battery 25 includes a rechargeable lithium-ion battery. By being mounted in the battery mounting section 13, the battery 25 can supply power to the angle fastening tool 1. The motor 6 and the light unit 17 are each driven based on the power supplied from the battery 25.

[0098] The controller 18 operates based on power supplied from the battery 25. The controller 18 is connected to the motor 6, switch board 16C, and trigger lever 14 via wiring. The controller 18 is connected to the battery 25 via wiring. The wiring passes inside the grip section 22.

[0099] The controller 18 outputs control signals to control the motor 6. The controller 18 includes a circuit board on which multiple electronic components are mounted. Examples of electronic components mounted on the circuit board include a processor such as a CPU (Central Processing Unit), non-volatile memory such as ROM (Read Only Memory) or storage, volatile memory such as RAM (Random Access Memory), a field-effect transistor (FET), and a resistor. The controller 18 sets the operating mode of the angle fastening tool 1 based on the operation of the operation panel 16. The setting parameters for the operating mode of the angle fastening tool 1 include the current threshold and on / off control conditions of the motor 6. The controller 18 outputs a signal to the operation panel 16 to display the setting status of the operating mode.

[0100] The controller 18 is positioned behind the switch board 16C. The controller 18 is positioned behind the trigger lever 14. The controller 18 is housed in the battery holder 23. The controller 18 is positioned above the battery mounting section 13. The controller 18 is oriented in the front-to-back and left-to-right directions. The controller 18 is positioned so as to overlap the upper surface of the battery mounting section 13. The battery holder 23 has a dome-shaped outer shape that forms the housing space for the controller 18.

[0101] As shown in Figure 4, the trigger lever 14 is provided on the grip portion 22. The trigger lever 14 is provided at the front end of the grip portion 22. The trigger lever 14 is provided so as to protrude downward from the lower surface of the grip portion 22. The trigger lever 14 is operated by the operator to start the motor 6. A switch body 14A is positioned above the trigger lever 14. The switch body 14A is positioned inside the grip portion 22. When the trigger lever 14 is operated, the switch body 14A is operated. When the switch body 14A is operated, a trigger signal is generated. The controller 18 switches between driving and stopping the motor 6 based on the trigger signal.

[0102] As shown in Figure 2, in the vertical direction, the lower end 14B of the trigger lever 14 is positioned above the lower end of the tool holder 51. The lower end 14B of the trigger lever 14 is positioned above the lower surface of the battery 25. In the vertical direction, the lower end 14B of the trigger lever 14 is positioned between the lower end of the tool holder 51 and the lower surface 21P of the motor housing 21. In the vertical direction, the lower end 14B of the trigger lever 14 is positioned closer to the lower surface 21P of the motor housing 21 than to the lower end of the tool holder 51. In other words, the vertical distance from the lower end 14B of the trigger lever 14 to the lower surface 21P of the motor housing 21 is smaller than the vertical distance from the lower end 14B of the trigger lever 14 to the lower end of the tool holder 51. The lower end 14B of the trigger lever 14 may be positioned above the lower surface 21P of the motor housing 21.

[0103] The forward / reverse rotation switching lever 15 is provided on the grip portion 22. The forward / reverse rotation switching lever 15 is positioned above the trigger lever 14 on the left and right sides of the grip portion 22. The forward / reverse rotation switching lever 15 is operated by the operator. When the forward / reverse rotation switching lever 15 is operated, the rotation direction of the motor 6 is switched from one direction to the other. When the rotation direction of the motor 6 is switched, the rotation direction of the spindle 8 is switched.

[0104] The light unit 17 emits illumination light. The light unit 17 illuminates the anvil 10 and its surroundings with illumination light. The light unit 17 includes one or more light-emitting elements 53. The light unit 17 includes chip-on-board light-emitting diodes (COB LEDs).

[0105] In the first embodiment, the trigger lever 14 located at the front end of the grip portion 22, the switch board 16C, and the motor 6 are positioned close to each other in the front-rear direction. As a result, the motor 6, which is one of the heavy components of the angle fastening tool 1, is positioned close to the grip portion 22, including the trigger lever 14.

[0106] As shown in Figure 4, the angle fastening tool 1 has the motor 6, switch board 16C (operation panel 16), trigger lever 14, and controller 18 arranged in that order from front to rear. The front-to-back distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-to-back distance L2 between the trigger lever 14 and the controller 18. As shown in Figure 5, the front-to-back distance L3 between the trigger lever 14 and the rear bearing 38R is smaller than the front-to-back length L10 of the switch board 16C.

[0107] As shown in Figure 5, the switch board 16C is positioned in front of the trigger lever 14, overlapping with the motor 6 in the vertical direction. Overlapping in the vertical direction means that when two or more objects are viewed from above, they have overlapping portions. The fact that the switch board 16C overlaps with the motor 6 in the vertical direction can be rephrased as at least a part of the switch board 16C and at least a part of the motor 6 being positioned at the same location in the front-to-back direction. The front end 16F of the switch board 16C overlaps with the rear of the motor 6 in the vertical direction. The front end 16F of the switch board 16C is positioned at the same location as the rear of the motor 6 in the front-to-back direction, and is offset from the motor 6 in the vertical direction.

[0108] The front end 16F of the switch board 16C is positioned in front of the rear bearing 38R. The front end 16F of the switch board 16C is positioned in front of the rear end of the motor 6. The switch board 16C overlaps both the stator 26 and the rotor 27 in the vertical direction. In other words, the front end 16F of the switch board 16C is positioned in front of the rear surface of the stator core 28 and in front of the rear surface of the rotor core 32.

[0109] The rear end 16R of the switch board 16C overlaps with the front of the trigger lever 14 in the vertical direction. The rear end 16R of the switch board 16C is positioned at the same position in the front-to-back direction as the front of the trigger lever 14, and is offset vertically from the trigger lever 14. The rear end 16R of the switch board 16C is located behind the front of the trigger lever 14. The rear end 16R of the switch board 16C is located behind the bearing 38R.

[0110] (Light unit) Figure 10 is a longitudinal cross-sectional view along the front-to-back direction showing the light unit 17 according to the embodiment. Figure 11 is an exploded perspective view showing the structure of the light unit 17 according to the embodiment. Figure 12 is a perspective view from below showing the front of the angle fastening tool 1 according to the embodiment. Figure 13 is an exploded perspective view from below showing the mounting of the light cover to the case according to the embodiment. Figure 14 is a perspective view from below showing the case according to the embodiment. Figure 15 is a bottom view of the case with the light cover removed. Figure 16 is a perspective view showing the light cover.

[0111] The light unit 17 is positioned on the lower surface of the case 4. The light unit 17 is positioned around the cylindrical portion 82. The light unit 17 is positioned around the anvil 10 via the cylindrical portion 82. In this embodiment, the light unit 17 has an annular shape that surrounds the anvil 10.

[0112] The light unit 17 includes a plurality of light-emitting elements 53. The light-emitting elements 53 are LED (light-emitting diodes) elements. The light unit 17 has a substrate 54 on which the plurality of light-emitting elements 53 are provided.

[0113] The light-emitting element 53 is held in the case 4. The light-emitting element 53 is held on the lower surface of the case 4. Multiple light-emitting elements 53 are provided around the anvil 10. Multiple light-emitting elements 53 are arranged along the circumferential direction of the anvil 10. Multiple light-emitting elements 53 are arranged in the rotational direction around the anvil 10. The light-emitting elements 53 are arranged around at least a portion of the anvil shaft portion 10A. Multiple light-emitting elements 53 are aligned along the rotational direction of the anvil 10. The light-emitting elements 53 are mounted on the lower surface of the substrate 54.

[0114] Examples of substrates 54 include aluminum substrates, glass cloth-based epoxy resin substrates (FR-4 substrates), and composite-based epoxy resin substrates (CEM-3 substrates). The light-emitting elements 53 are mounted on the surface of the substrate 54. The light-emitting elements 53 and the substrate 54 are connected via gold wires (not shown). The gold wires connect multiple light-emitting elements 53 to each other. The multiple light-emitting elements 53 are surrounded by a bank 55. A phosphor 56 is placed within the compartmentalized space surrounded by the bank 55. The light-emitting elements 53 are covered by the phosphor 56. A pair of electrodes (not shown) are placed on the front or back surface of the substrate 54 outside the bank. One electrode of the pair is the positive electrode, and the other electrode is the negative electrode. Lead wires 65 are connected to each of the pair of electrodes. Power output from the battery 25 is supplied to the electrodes via the lead wires 65. The power supplied to the electrodes is supplied to the light-emitting elements 53 via the substrate 54 and the gold wires. The light-emitting element 53 emits light based on power supplied from the battery 25. The light unit 17 and the controller 18 are connected via lead wires 65.

[0115] The substrate 54 has an annular shape that surrounds the cylindrical portion 82. Multiple light-emitting elements 53 are arranged at intervals around the substrate 54 in the circumferential direction. The number of light-emitting elements 53 is not limited as long as there are multiple elements. In this embodiment, 12 light-emitting elements 53 are arranged at equal intervals around the circumferential direction of the cylindrical portion 82 (see Figure 11).

[0116] The light unit 17 has an optical element 57.

[0117] The optical element 57 is connected to the light unit 17. The optical element 57 is made of polycarbonate resin. In this embodiment, the optical element 57 is made of polycarbonate resin containing a white diffusing material. The optical element 57 is milky white. The optical element 57 transmits at least a portion of the light emitted from the light unit 17. The light transmittance of the optical element 57 is, for example, 40% to 70%. The optical element 57 diffuses the light from the multiple light emitters 53.

[0118] The optical member 57 is positioned to cover the front of the multiple light-emitting elements 53. At least a portion of the optical member 57 is positioned in front of the light unit 17. The optical member 57 is continuous, spanning across the multiple light-emitting elements 53. The optical member 57 is formed in an annular shape that surrounds the anvil 10 so as to cover the multiple light-emitting elements 53. The optical member 57 is annular. The optical member 57 has an outer cylindrical portion 57A, an inner cylindrical portion 57B, a light-transmitting portion 57C, and a convex portion 57D.

[0119] As shown in Figure 10, the outer cylinder portion 57A is positioned radially outward from the inner cylinder portion 57B. In the radial direction, the multiple light-emitting elements 53 are positioned between the outer cylinder portion 57A and the inner cylinder portion 57B. The inner cylinder portion 57B is positioned radially outward from the cylindrical portion 82 of the case 4. The light-transmitting portion 57C is positioned below the multiple light-emitting elements 53. The light-transmitting portion 57C is annular in shape. The light-transmitting portion 57C is positioned to connect the front end of the outer cylinder portion 57A and the front end of the inner cylinder portion 57B. The light-transmitting portion 57C faces the lower surface of the substrate 54. The light-transmitting portion 57C faces the light-emitting elements 53. Light emitted from the light-emitting elements 53 passes through the light-transmitting portion 57C and is irradiated downward from the light unit 17. The lower surface of the light-transmitting portion 57C constitutes the light-emitting surface of the light unit 17.

[0120] The protrusion 57D is positioned behind the light-transmitting portion 57C. The protrusion 57D is provided so as to project backward from the rear of the outer cylinder portion 57A. By being positioned between the pair of guide protrusions 83 of the case 4 (see Figures 14 and 15), the protrusion 57D functions as a positioning portion for the light unit 17 in the rotational direction.

[0121] As shown in Figure 10, the upper surface of the substrate 54 is positioned below the upper end of the outer cylinder portion 57A and the upper end of the inner cylinder portion 57B. The substrate 54 and the multiple light-emitting elements 53 are placed in a concave housing space formed by the outer cylinder portion 57A, the inner cylinder portion 57B, and the light-transmitting portion 57C of the optical member 57. The upper surface of the housing space is open. Molding resin 58 is filled into the housing space. The molding resin 58 fixes the multiple light-emitting elements 53, the substrate 54, the optical member 57, and a portion of the lead wire 65 to each other.

[0122] Case 4 holds the light unit 17. The light unit 17, which includes multiple light-emitting elements 53, is held on the underside of case 4. The angle fastening tool 1 is positioned on the underside of case 4 and includes a light cover 60 that holds the light-emitting elements 53 and covers the lead wires 65.

[0123] (Light cover) As shown in Figures 12 and 13, the light cover 60 is separate from the motor housing 21. The light cover 60 is separate from the case 4. The light cover 60 engages with the motor housing 21. The light cover 60 is mounted on the lower surface of the case 4. The light cover 60 holds the light unit 17 on the lower surface of the case 4. The light unit 17 is held between the lower surface of the case 4 and the light cover 60. The light cover 60 is made of, for example, resin.

[0124] The light cover 60 includes a light-emitting element holding portion 61 and a cover portion 62. The light cover 60 is a single component in which the light-emitting element holding portion 61 and the cover portion 62 are integrally formed. The light-emitting element holding portion 61 is separate from the motor housing portion 21. The cover portion 62 is separate from the motor housing portion 21. The light-emitting element holding portion 61 is separate from the case 4. The cover portion 62 is separate from the case 4.

[0125] The light-emitting element holder 61 is positioned on the lower surface of the case 4 and holds a plurality of light-emitting elements 53. The light-emitting elements 53 and the light-emitting element holder 61 are positioned on the mounting surface 81. The light-emitting element holder 61 is provided circumferentially along the outer circumference of the optical member 57. The light-emitting element holder 61 is ring-shaped and surrounds the outer circumference of the optical member 57. The light-emitting element holder 61 has a peripheral wall portion 61A that surrounds the periphery of the optical member 57. The peripheral wall portion 61A is ring-shaped. The peripheral wall portion 61A extends vertically from the mounting surface 81 of the case 4 to the lower surface of the optical member 57. The light-emitting element holder 61 has a locking portion 61B that protrudes radially inward from the lower end of the peripheral wall portion 61A. The locking portion 61B is provided along the entire inner circumference of the peripheral wall portion 61A. The locking portion 61B is located below the lower surface of the optical member 57. The locking portion 61B contacts the lower surface of the optical member 57 from below. The locking portion 61B makes localized contact with the outer peripheral edge of the lower surface of the optical member 57 by catching on it. The locking portion 61B is located on the lower surface of the optical member 57, on the outer peripheral side of the light-emitting body 53. The light-emitting body holding portion 61 supports the lower surface of the optical member 57 at the locking portion 61B. As described above, the light unit 17, including the optical member 57, the light-emitting body 53, and the substrate 54, is integrated by the molded resin 58, so the light-emitting body holding portion 61 supports the entire light unit 17, including the light-emitting body 53, from below by supporting the lower surface of the optical member 57. The light-emitting body holding portion 61 exposes the lower surface of the optical member 57 at a position directly below the light-emitting body 53 and at a position on the inner peripheral side of the light-emitting body 53.

[0126] The light-emitting element holder 61 is fixed to the lower surface of the case 4 by a screw 60S, which tightens the light-emitting element holder 61 toward the lower surface of the case 4. The light-emitting element holder 61 holds multiple light-emitting elements 53 by pressing the lower surface of the optical member 57 toward the case 4 with the locking portion 61B. The light-emitting element holder 61 presses the outer peripheral edge of the lower surface of the optical member 57.

[0127] The light-emitting element holder 61 is fixed to the lower surface of the case 4 by screws 60S at multiple locations around the optical element 57. The light-emitting element holder 61 is fixed to the lower surface of the case 4 by four screws 60S at the four corners. Screw holes 81A are formed in the flat mounting surface 81 of the lower surface of the case 4. The screw holes 81A are located at the four corners surrounding the cylindrical part 82. In other words, the four screw holes 81A are arranged at approximately 90-degree intervals in the rotational direction of the cylindrical part 82. The peripheral wall 61A has boss portions 61H to which the screws 60S are attached. The boss portions 61H are located at the four corners surrounding the cylindrical part 82, corresponding to the screw holes 81A on the mounting surface 81. The boss portions 61H have through holes for the screws 60S to pass through. The screws 60S pass through the through holes in the boss portions 61H from below and are fixed to the screw holes 81A. The axial force of the screw 60S causes the light-emitting element holder 61 to press the optical element 57 upward toward the mounting surface 81 from the four corners around the optical element 57.

[0128] As shown in Figure 10, the angle fastening tool 1 further comprises a buffer member 59 positioned between the light-emitting element 53 and the lower surface of the case 4, the buffer member 59 positioned above the light unit 17. The buffer member 59 is an elastic material, for example, made of rubber. The buffer member 59 protects the substrate 54 and optical element 57 from contact with the case 4, which is a metal vibrator. The buffer member 59 covers at least a portion of the upper surface of the light unit 17. Due to the interposition of the buffer member 59, the light unit 17 is held between the mounting surface 81 and the light-emitting element holding part 61, away from the mounting surface 81 of the case 4.

[0129] The cushioning member 59 is ring-shaped. The cushioning member 59 overlaps the light unit 17 around its entire circumference. The cushioning member 59 is held in an elastically deformed state by being sandwiched between the light unit 17 and the mounting surface 81. The cushioning member 59 is crushed by the light unit 17 due to the axial force of the screw 60S. The cushioning member 59 deforms to match the shape of the upper surface of the light unit 17 so as to fill the gap between the light unit 17 and the mounting surface 81. The upper surface of the cushioning member 59 contacts the mounting surface 81 and the cylindrical portion 82. The lower surface of the cushioning member 59 contacts the light unit 17.

[0130] As shown in Figures 12 and 13, the cover portion 62 covers the lead wire 65. The lead wire 65 extends from the motor housing portion 21. The lead wire 65 is connected to multiple light-emitting elements 53. In other words, the lead wire 65 extends from the light unit 17 to the motor housing portion 21 along the bottom surface of the case 4. The lead wire 65 connects the multiple light-emitting elements 53 to the controller 18. The lead wire 65 (see Figure 4) extends from the controller 18, through the battery holder portion 23 and the inside of the motor housing portion 21, and extends to the bottom surface of the case 4 from the lower opening 21D on the front of the motor housing portion 21. The lead wire 65 extends forward along the bottom surface of the case 4 and connects to the circuit board 54 of the light unit 17. As a result, the lead wire 65 connects to the multiple light-emitting elements 53 on the circuit board 54 and supplies power.

[0131] As shown in Figure 15, the lead wire 65 includes a first lead wire 65A extending from the motor housing 21 and a second lead wire 65B connected to the first lead wire 65A via a connector 66 and connected to a plurality of light-emitting elements 53. The first lead wire 65A extends forward from inside the motor housing 21 through the lower opening 21D of the motor housing 21 to the bottom surface of the case 4. The first lead wire 65A is provided with a connector 66A on one side. The second lead wire 65B extends rearward from the circuit board 54 of the light unit 17 along the bottom surface of the case 4. The second lead wire 65B is provided with a connector 66B on the other side. By connecting the connector 66A of the first lead wire 65A and the connector 66B of the second lead wire 65B, the first lead wire 65A and the second lead wire 65B become electrically connected. Connectors 66A and 66B are detachable by insertion and removal. When connector 66B is separated from connector 66A, the subassembly consisting of the light unit 17, the second lead wire 65B, and connector 66B can be separated from the angle fastening tool 1.

[0132] As shown in Figures 14 and 15, the case 4 has a groove 84 on its lower surface for arranging the lead wires 65. The groove 84 is a concave portion that is recessed upward from the lower surface of the case 4. The groove 84 is provided on the lower surface of the case 4, along the front-rear direction, from the rear end of the mounting surface 81 to the rear end of the case 4. The first lead wire 65A and the second lead wire 65B are arranged in the groove 84. The connector 66A of the first lead wire 65A and the connector 66B of the second lead wire 65B are connected in the groove 84.

[0133] The angle fastening tool 1 includes an earth wire 67 that extends from the motor housing 21 and connects to the lower surface of the case 4. The earth wire 67 is connected to a grounding terminal 84B provided on the lower surface of the case 4. The grounding terminal 84B is located in a groove 84. The earth wire 67 is connected to the grounding terminal 84B from the lower opening 21D of the motor housing 21, through the groove 84. The lead wire 65 and the earth wire 67 are located in the same groove 84.

[0134] The groove 84 has a narrow passage 84A at its rear end. The passage 84A extends to the rear surface of the case 4. The lead wires 65 and ground wires 67 extending from the lower opening 21D (see Figure 13) of the motor housing 21 pass through the passage 84A. The passage 84A allows the starting positions of the lead wires 65 and ground wires 67 on the lower surface of the case 4 to be determined by the position of the passage 84A, and also allows multiple wires to be bundled together.

[0135] The cover portion 62 covers the lead wire 65 and the ground wire 67. The cover portion 62 covers the groove portion 84 in which the lead wire 65 is located. The cover portion 62 covers the ground wire 67 and the grounding terminal 84B. On the lower surface of the case 4, the cover portion 62 extends from the position where the multiple light-emitting elements 53 are located to the motor housing portion 21. Specifically, the cover portion 62 extends rearward from the rear end of the light-emitting element holding portion 61. The cover portion 62 extends to the front surface of the motor housing portion 21. The cover portion 62 covers the entire groove portion 84.

[0136] As shown in Figure 16, the cover portion 62 has a cover recess 63 that is recessed downward from the top surface, in contrast to the groove portion 84. Between the bottom surface of the case 4 and the cover portion 62, a wiring accommodation space is formed, which is composed of the groove portion 84 and the cover recess 63.

[0137] The cover portion 62 has a claw portion 62A that engages with the motor housing portion 21. The claw portion 62A is located at the rear end of the cover portion 62. The claw portion 62A protrudes rearward from the rear end of the cover portion 62. The claw portion 62A engages with the motor housing portion 21 (see Figure 13) by being inserted into the lower opening 21D of the motor housing portion 21. The rear end of the cover portion 62 is movable in the front-rear direction but not downward due to the engagement between the motor housing portion 21 and the claw portion 62A. The cover portion 62 is fixed to the case 4 with the claw portion 62A engaged with the motor housing portion 21. The cover portion 62 covers the entire lower opening 21D of the motor housing portion 21.

[0138] As shown in Figures 12 and 13, the light cover 60, including the light-emitting element holder 61 and the cover portion 62, covers substantially the entire lower surface of the case 4. When assembling the angle fastening tool 1, the assembler places the light unit 17 on the mounting surface 81 via the cushioning member 59, connects the connector 66A and the connector 66B, and then attaches the light cover 60 to the case 4. The light cover 60 is fixed to the case 4 by screws 60S with four boss portions 61H, with the claw portion 62A inserted into and engaged with the lower opening 21D of the motor housing portion 21. When replacing the light unit 17 for maintenance, the light cover 60 can be removed from the case 4 in the reverse order, and then the light assembly consisting of the light unit 17, the second lead wire 65B, and the connector 66B can be removed from the angle fastening tool 1 simply by separating the connector 66A and the connector 66B.

[0139] (Bearing retention structure) Figure 17 is a longitudinal cross-sectional view showing the area around the bevel gear 35 of the angle fastening tool 1 according to the embodiment. Figure 18 is an exploded perspective view showing the rear surface of the case 4 according to the embodiment. Figure 19 is an exploded perspective view showing the front surface of the motor housing portion 21 according to the embodiment. Figure 20 is an exploded perspective view showing the bevel gear 35, bearing 38F, and intermediate support member 91 according to the embodiment. Figure 21 is a longitudinal cross-sectional view showing the intermediate support member 91 according to the embodiment.

[0140] As described above, the angle fastening tool 1 includes a bearing 38F that rotatably holds the bevel gear 35. The bearing 38F contacts the rotor shaft portion 33 and rotatably holds the bevel gear 35 via the rotor shaft portion 33. The bearing 38F is held in the case 4. The bearing 38F is held at the rear of the case 4.

[0141] As shown in Figure 17, the angle fastening tool 1 comprises an intermediate support member 91 having a front surface that contacts the bearing 38F, and a fixing member FM that contacts the rear surface of the intermediate support member 91. The fixing member FM, together with the case 4, fixes the intermediate support member 91 by clamping it. Therefore, the bearing 38F is held in place by the fixing member FM and the case 4 clamping the bearing 38F and the intermediate support member 91 positioned on the rear surface of the bearing 38F.

[0142] The fixing member FM may be an independent member, or it may be integrally formed with the member of the angle fastening tool 1 so as to constitute a part of the member of the angle fastening tool 1. In this embodiment, the fixing member FM is integrally formed with the motor housing portion 21. The fixing member FM is a support wall 21G integrally formed with the motor housing portion 21. Therefore, the bearing 38F is sandwiched between the motor housing portion 21 and the case 4, which are connected in the front-rear direction.

[0143] The bearing 38F is a ball bearing having an inner ring 71, an outer ring 72, and balls 73. The rotor shaft portion 33 is fitted onto the inner ring 71. The front end of the inner ring 71 faces the rear surface of the bevel gear 35. The rear end of the inner ring 71 faces the stepped portion of the rotor shaft portion 33.

[0144] As shown in Figures 17 and 18, the case 4 has a recess 85 that extends forward from the rear of the case 4 and accommodates the bearing 38F. The bearing 38F is positioned inside the recess 85. The case 4 has an outer cylinder portion 86 on which the case flange portion 4F is formed, and an inner cylinder portion 87 on which the recess 85 is formed. The inner cylinder portion 87 is formed radially inward from the outer cylinder portion 86. The inner cylinder portion 87 is cylindrical in shape, and its inner diameter decreases in a stepped manner. That is, the inner cylinder portion 87 includes a recess 85 having an inner diameter D1 and a hole portion 88 having an inner diameter D2. The inner diameter D2 is smaller than the inner diameter D1. The recess 85 is a recess that extends forward from the rear surface of the case 4. The bearing 38F is positioned inside the recess 85. The bearing 38F is in contact with the inner circumferential surface of the housing recess 85 and the front surface of the housing recess 85 (the stepped portion with the hole 88), which corresponds to the bottom surface of the housing recess 85. The hole 88 is a through hole along the rotating shaft AX. The bevel gear 35 is positioned within the hole 88. The bevel gear 35 passes through the hole 88 and meshes with the driven gear 41A.

[0145] In this configuration, case 4 has a radial support surface 85A that supports the radial load acting on the bearing 38F, and a front support surface 85B that supports the forward thrust load acting on the bearing 38F. The radial support surface 85A is the inner circumferential surface of the housing recess 85. The front support surface 85B is the front (bottom) surface of the housing recess 85.

[0146] The radial support surface 85A is annular. The outer ring 72 of the bearing 38F is fitted onto the radial support surface 85A. The radial support surface 85A is provided with a groove 85D in which an O-ring 85C is placed. The O-ring 85C is in contact with the inner surface of the groove 85D and the outer ring 72.

[0147] The front support surface 85B is annular. The front support surface 85B faces the outer ring 72 of the bearing 38F in the front-rear direction. The front support surface 85B is in contact with the front end surface of the outer ring 72.

[0148] As shown in Figures 17, 19, and 20, the support wall 21G, which is a fixed member FM, directly or indirectly supports the rear surface of the bearing 38F on the front surface of the motor housing 21. In this embodiment, the support wall 21G indirectly supports the rear surface of the bearing 38F via an intermediate support member 91. The support wall 21G constitutes a part of the front surface of the motor housing 21.

[0149] Specifically, the front surface of the motor housing portion 21 includes a housing flange portion 21F with screw insertion holes 21H at its four corners, an annular rib 21E protruding forward from the housing flange portion 21F, and a support wall 21G. The annular rib 21E is positioned in the space between the outer cylinder portion 86 and the inner cylinder portion 87 of the case 4. The inner cylinder portion 87 is positioned on the inner circumference of the annular rib 21E. A projection 21J is provided at the lower part of the annular rib 21E, protruding forward. The projection 21J is inserted into an engagement hole 89 of the case 4. The projection 21J and the engagement hole 89 provide rotational positioning of the case 4 around the rotation axis AX relative to the motor housing portion 21.

[0150] The support wall 21G is positioned inside the annular rib 21E. The support wall 21G extends radially inward from the annular rib 21E. A central opening 92 is formed in the support wall 21G through which the rotor shaft portion 33 passes. The support wall 21G is ring-shaped. The support wall 21G faces the front support surface 85B of the housing recess 85 in the front-rear direction. The support wall 21G faces the bearing 38F in the front-rear direction. The support wall 21G faces the rear end surface of the outer ring 72 of the bearing 38F via the intermediate support member 91.

[0151] A recess 93 is formed on the front surface of the support wall 21G, in which the intermediate support member 91 is positioned. The recess 93 is recessed from the front to the rear. The recess 93 has a shape corresponding to the outer shape of the intermediate support member 91, and the intermediate support member 91 is positioned within the recess 93. The bottom surface of the recess 93, which is recessed to the rear, is the rear support surface 94 that contacts the rear surface of the intermediate support member 91. The rear support surface 94 supports the rearward thrust load acting on the bearing 38F. Thus, the motor housing 21 has a rear support surface 94 that supports the rearward thrust load acting on the bearing 38F. The rear support surface 94 is the front surface of the support wall 21G and is also the bottom surface of the recess 93 in which the intermediate support member 91 is positioned.

[0152] The intermediate support member 91 contacts the rear surface of the bearing 38F on its front surface and the fixed member FM on its rear surface. The front surface of the intermediate support member 91 contacts the rear end surface of the outer ring 72 of the bearing 38F. The rear surface of the intermediate support member 91 contacts the rear support surface 94 of the front surface of the support wall 21G, which is the fixed member FM. The intermediate support member 91 is a flat plate with a constant thickness.

[0153] The intermediate support member 91 is provided along the rear surface of the bearing 38F. The front surface of the intermediate support member 91 extends circumferentially along the rear end surface of the outer ring 72 of the bearing 38F. The intermediate support member 91 is provided so as to surround the rotor shaft portion 33 and has a C-shape including one end and the other end. That is, the intermediate support member 91 is not ring-shaped, and a gap CL is formed between the one end and the other end. In this embodiment, the gap CL is larger than the diameter of the rotor shaft portion 33 in a cross-section along the front surface of the intermediate support member 91. The inner circumference of the intermediate support member 91 is arc-shaped. Each side of the outer circumference of the intermediate support member 91 is straight, and the outer circumference of the intermediate support member 91 is rectangular except for the gap CL.

[0154] As described above, the fixing member FM, together with the case 4, secures the intermediate support member 91 solely by clamping it. "Securing solely by clamping" means that there is no structure to secure the intermediate support member 91 by any other means, such as screws or rivets, other than by clamping it between the fixing member FM and the case 4. The intermediate support member 91 does not have screw holes.

[0155] The intermediate support member 91 and the fixing member FM are elastically deformed by one of them. In other words, either the intermediate support member 91 or the fixing member FM is assembled in a state of compression in the front-rear direction by the force used to clamp the intermediate support member 91. As a result, there is no gap (play) in the front-rear direction of the bearing 38F between the case 4 and the fixing member FM.

[0156] Either the intermediate support member 91 or the fixing member FM may undergo elastic deformation, but in this embodiment, as shown in Figure 21, the fixing member FM undergoes elastic deformation. Specifically, the intermediate support member 91 has higher hardness than the fixing member FM. The intermediate support member 91 is made of metal. The fixing member FM is made of resin. The fixing member FM clamps the intermediate support member 91 with elastic deformation. The intermediate support member 91 is held in a state where its rear surface is slightly embedded in the fixing member FM. For convenience, the deformation state of the fixing member FM is not shown in the figures other than Figure 21.

[0157] In this embodiment, the width W1 of the rear surface of the intermediate support member 91 in the radial direction is greater than the width W2 of the outer ring 72 in the radial direction (i.e., the thickness of the outer ring 72). Therefore, the intermediate support member 91 makes contact with the fixed member FM over a larger area than the outer ring 72, thereby distributing the thrust load acting from the outer ring 72.

[0158] Here, we will explain the load acting on the bearing 38F. In this embodiment, the bevel gear 35 and the driven gear 41A are spiral bevel gears. A spiral bevel gear is a bevel gear in which the tooth traces are curved in a helical shape around the axis of rotation. Compared to a straight bevel gear in which the tooth traces are straight and extend radially, a spiral bevel gear has a larger contact area between gears and a larger number of teeth that mesh simultaneously, resulting in features such as high strength (high torque transmission), low noise, low vibration, and low wear.

[0159] In the rotational transmission of spiral bevel gears, not only radial loads but also thrust loads are generated. The thrust load depends on the tooth ratio of the bevel gear 35 and the driven gear 41A, but the direction of action of the thrust load may be reversed depending on the difference in the direction of rotation between forward and reverse rotation. Therefore, the bevel gear 35 may be subjected to radial loads in the radial direction and thrust loads in the forward and backward directions along the rotation axis AX.

[0160] In Figure 17, the thrust load acting on the bevel gear 35 is transmitted to the bearing 38F because the bevel gear 35 is fixed to the rotor shaft portion 33, and the inner ring 71 of the bearing 38F is fixed to the rotor shaft portion 33. The forward thrust load transmitted to the bearing 38F is supported by the front support surface 85B of the case 4 via the outer ring 72. The rearward thrust load transmitted to the bearing 38F acts on the intermediate support member 91 via the outer ring 72, and is further supported by the rear support surface 94 of the support wall 21G, which is a fixed member FM, via the intermediate support member 91. If the thickness of the outer ring 72 is small, the contact point with the outer ring 72 becomes close to line contact, and a large localized surface pressure acts. However, by interposing the intermediate support member 91 between the outer ring 72 and the rear support surface 94 and increasing the contact area with the rear support surface 94, the surface pressure acting on the rear support surface 94 formed on the resin motor housing portion 21 is reduced.

[0161] Furthermore, the radial load acting on the bevel gear 35 acts on the bearing 38F via the rotor shaft portion 33 and is supported by the radial support surface 85A of the case 4.

[0162] (Assembly workability of intermediate support members) Figure 22 is an exploded perspective view showing a subassembly of the rotor 27 according to the embodiment. As shown in Figure 22, 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 pre-assembled on the rotor 27. These components are assembled to the rotor shaft portion 33 so that the fan 12, intermediate support member 91, bearing 38F, and bevel gear 35 are arranged in order from rear to front. In this embodiment, since the intermediate support member 91 has a C-shape, it is possible to assemble the intermediate support member 91 radially to the rotor shaft portion 33 by passing the rotor shaft portion 33 through the gap CL. In other words, even if the bearing 38F and bevel gear 35 are installed first, the intermediate support member 91 can be installed in the predetermined position afterward. Therefore, even if the intermediate support member 91 is forgotten to be installed, it can be corrected retrospectively, resulting in high assembly efficiency.

[0163] (How to use) The method of using the angle fastening tool 1 according to the embodiment will now be described. For example, when performing a fastening operation on an object, the socket, which is the tip tool, is attached to the tip tool holder 51. When the operator operates the trigger lever 14, power is supplied from the battery 25, the motor 6 starts up, and light is emitted from the light-emitting element 53 of the light unit 17. Since the light from the light unit 17 is emitted downward from around the anvil 10, the light can reach the work area even in narrow spaces with many obstacles. The luminous intensity of the light emitted from the light unit 17 is high, and the work area can be brightly illuminated.

[0164] The rotor 27 rotates under the drive of the motor 6. As the rotor 27 rotates, its rotational force is transmitted to the spindle 8 via the reduction mechanism 7. The spindle 8 rotates at a rotational speed lower than the rotational speed of the rotor shaft 33. When the spindle 8 rotates with the hammer projection 47B and the anvil projection 10B in contact, the anvil 10 rotates together with the hammer 47 and the spindle 8. As the anvil 10 rotates, the tip tool rotates, and the fastening operation proceeds.

[0165] As the fastening process progresses, if a load exceeding a predetermined value is applied to the anvil 10 via the tip tool, the rotation of the anvil 10 and the hammer 47 stops. When the spindle 8 rotates while the rotation of the hammer 47 is stopped, the hammer 47 moves upward. As the hammer 47 moves upward, the contact between the hammer projection 47B and the anvil projection 10B is released, and the hammer 47, having moved upward, moves downward while rotating due to the elastic force of the coil spring 49. As the hammer 47 moves downward while rotating, the anvil 10 is struck in the rotational direction by the hammer 47. As a result, the anvil 10 and the tip tool rotate around the rotation axis BX with high torque. Therefore, the bolt or nut is tightened with high torque.

[0166] (effect) As described above, in this embodiment, the angle fastening tool 1 comprises a grip portion 22 extending in the front-rear direction, a motor housing portion 21 positioned in front of the grip portion 22, a motor 6 positioned inside the motor housing portion 21, a spindle 8 positioned in front of the motor 6 and extending in a direction intersecting the front-rear direction and rotated by the motor 6, a case 4 housing the spindle 8, a tip tool holder portion 51 protruding downward from the lower surface of the case 4 and rotated by the spindle 8, and a trigger lever 14 provided to protrude downward from the lower surface of the grip portion 22. In the vertical direction, the lower end portion 14B of the trigger lever 14 is positioned closer to the lower surface 21P of the motor housing portion 21 than the lower end portion of the tip tool holder portion 51.

[0167] In the above configuration, in the vertical direction, the lower end 14B of the trigger lever 14 is positioned closer to the lower surface 21P of the motor housing 21 than the lower end of the tip tool holding portion 51. As a result, the trigger lever 14 is positioned close to the fingers gripping the grip portion 22 without protruding too far downward, improving operability when the operator grips the grip portion 22. In addition, when inserting the angle fastening tool 1 into a narrow space, the trigger lever 14 or the fingers on the trigger lever 14 are less likely to come into contact with surrounding structures, reducing the possibility of unintentional operation. These improvements enhance the operability of the angle fastening tool 1.

[0168] In one embodiment, the angle fastening tool 1 includes a battery holder 23 connected to the rear end of the grip portion 22, which detachably holds the battery 25. The lower end 14B of the trigger lever 14 is located above the lower surface of the battery 25.

[0169] In the above configuration, the lower end 14B of the trigger lever 14 is positioned above the lower surface of the battery 25, so that the trigger lever 14 and the fingers resting on it do not come into contact with surrounding structures.

[0170] In this embodiment, the angle fastening tool 1 includes a grip portion 22 extending in the front-rear direction, a motor housing portion 21 positioned in front of the grip portion 22, a motor 6 positioned inside the motor housing portion 21, a spindle 8 positioned in front of the motor 6 and extending in a direction intersecting the front-rear direction and rotated by the motor 6, a case 4 housing the spindle 8, a tip tool holder portion 51 protruding downward from the lower surface of the case 4 and rotated by the spindle 8, and a trigger lever 14 provided to protrude downward from the lower surface of the grip portion 22. The circumference of the narrowest part 22N of the grip portion 22 is smaller than the circumference of the narrowest part 21N of the motor housing portion 21.

[0171] In the above configuration, the circumference of the narrowest part 22N of the grip portion 22 is smaller than the circumference of the narrowest part 21N of the motor housing portion 21. This prevents the grip portion 22 from becoming too thick, making it easier to grip and improving operability when the operator grips the grip portion 22. Because the grip portion 22 is thin, the trigger lever 14 of the grip portion 22 is less likely to protrude outward from the motor housing portion 21 (or the amount of protrusion is small). Therefore, when inserting the angle fastening tool 1 into a narrow space, the trigger lever 14 or the fingers on the trigger lever 14 are less likely to come into contact with surrounding structures, reducing the possibility of unintentional operation. As a result, the operability of the angle fastening tool 1 can be improved.

[0172] [Second Embodiment] A second embodiment will now be described. In the following description, components that are the same as or equivalent to those in the above-described embodiment will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0173] Figure 23 is a perspective view showing the intermediate support member 91A according to the second embodiment. Figure 24 is an exploded perspective view showing the subassembly of the motor 6 according to the second embodiment.

[0174] In the first embodiment, an example was shown in which the intermediate support member 91 has a C-shape, but in this second embodiment, the intermediate support member 91A has an annular shape.

[0175] The intermediate support member 91A has an annular shape that follows the rear surface of the bearing 38F. The intermediate support member 91A has a circular inner circumference and a roughly rectangular outer circumference. The four corners of the outer circumference of the intermediate support member 91A are chamfered. The annular intermediate support member 91A is in contact with the rear surface of the bearing 38F around its entire circumference.

[0176] Unlike the C-shaped intermediate support member 91, the annular-shaped intermediate support member 91A cannot be assembled to the rotor shaft portion 33 from the radial direction. Therefore, the fan 12, intermediate support member 91A, bearing 38F, and bevel gear 35 are assembled to the rotor shaft portion 33 from the front in the axial direction.

[0177] [Third Embodiment] A third embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0178] Figure 25 is a cross-sectional view showing the intermediate support member 91B according to the third embodiment.

[0179] In the second embodiment, an intermediate support member 91A with a circular inner circumference and a square outer circumference was shown, but the intermediate support member 91B according to this third embodiment has an annular shape.

[0180] The intermediate support member 91B has an annular shape that follows the rear surface of the bearing 38F. The intermediate support member 91B has a circular inner circumference and a circular outer circumference. In other words, the intermediate support member 91B is an annular washer. The annular intermediate support member 91B is in contact with the rear surface of the bearing 38F around its entire circumference. The intermediate support member 91B is a flat plate with a constant thickness.

[0181] During the assembly of the subassembly, the fan 12, intermediate support member 91B, bearing 38F, and bevel gear 35 are assembled axially from the front to the rotor shaft 33 in that order.

[0182] [Fourth Embodiment] A fourth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0183] Figure 26 is a cross-sectional view showing the intermediate support member 91C according to the fourth embodiment. Figure 27 is a longitudinal cross-sectional view showing the periphery of the intermediate support member 91C according to the fourth embodiment.

[0184] In the third embodiment, an intermediate support member 91B with a constant thickness and an annular shape was shown, but the intermediate support member 91C according to this fourth embodiment has a stepped annular shape.

[0185] The intermediate support member 91C has an annular shape that follows the rear surface of the bearing 38F. The intermediate support member 91C has a circular inner circumference and a circular outer circumference. In other words, the intermediate support member 91C is an annular shape. The annular intermediate support member 91C is in contact with the rear surface of the bearing 38F around its entire circumference.

[0186] The intermediate support member 91C has a step between its inner circumference and outer circumference, with the position offset in the thickness direction. In other words, the intermediate support member 91C has an outer circumference portion 101 and an inner circumference portion 102 that is inside the outer circumference portion 101, with the outer circumference portion 101 shifted forward of the inner circumference portion 102. The thickness of the intermediate support member 91C is constant, and the thickness of the inner circumference portion 102 and the thickness of the outer circumference portion 101 are substantially the same.

[0187] In the fourth embodiment, the fixing member FM (support wall 21G) of the motor housing portion 21 is provided with an outer peripheral mounting portion 103 that contacts the rear surface of the outer peripheral portion 101 of the intermediate support member 91C, and an inner peripheral mounting portion 104 that contacts the rear surface of the inner peripheral portion 102 of the intermediate support member 91C. The outer peripheral mounting portion 103 is shifted forward of the inner peripheral mounting portion 104, corresponding to the front-rear positional displacement between the outer peripheral portion 101 and the inner peripheral portion 102.

[0188] In the fourth embodiment, the position of the peripheral wall constituting the housing recess 85 of the case 4 is also shifted forward, corresponding to the outer periphery of the intermediate support member 91C and the outer mounting portion 103 of the motor housing portion 21. As a result, the depth D3 of the housing recess 85 of the case 4 (depth from the rear to the front) is smaller than the thickness D4 of the bearing 38F in the front-rear direction. The bearing 38F protrudes rearward from the rear end of the housing recess 85. The rear end of the bearing 38F is located behind the outer periphery 101 of the intermediate support member 91C and contacts the front surface of the inner periphery 102 of the intermediate support member 91C.

[0189] In this structure, the rearward thrust load acting on the bearing 38F is applied to the inner circumference 102 of the intermediate support member 91C. Since the intermediate support member 91C is in contact with the motor housing 21 at both its inner circumference 102 and outer circumference 101, the thrust load applied to the intermediate support member 91C is supported at both the inner circumference 102 and outer circumference 101 by the inner mounting portion 104 and the outer mounting portion 103, respectively.

[0190] In the fourth embodiment, since the outer peripheral mounting portion 103 is shifted forward, the thickness required to support the thrust load in the support wall 21G of the motor housing portion 21 can be provided on the forward side. As a result, the rear surface of the support wall 21G of the motor housing portion 21 can be made to not protrude backward, and space for installing the fan 12 can be easily secured.

[0191] [Fifth Embodiment] A fifth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0192] Figure 28 is a longitudinal cross-sectional view showing the intermediate support member 91D and the fixing member FM according to the fifth embodiment.

[0193] In the first embodiment, an example was shown in which the fixing member FM, of the intermediate support member 91 and the fixing member FM, undergoes elastic deformation. In this fifth embodiment, an example is shown in which the intermediate support member 91D, of the intermediate support member 91D and the fixing member FM, undergoes elastic deformation.

[0194] In the fifth embodiment, the intermediate support member 91D is made of resin. The fixing member FM is made of metal. The fixing member FM clamps the intermediate support member 91D while elastically deforming it. Also in the fifth embodiment, the bearing 38F is a sliding bearing.

[0195] In the fifth embodiment, the intermediate support member 91D and the bearing 38F are held by being sandwiched in the front-rear direction between a metal case 4 and a metal fixing member FM. The fixing member FM, together with the case 4, fixes the intermediate support member 91D solely by sandwiching it.

[0196] The intermediate support member 91D is elastically deformed by being sandwiched between the fixed member FM and the bearing 38F. The intermediate support member 91D is deformed so that the rear surface of the bearing 38F bites into the front surface of the intermediate support member 91D. As a result, no gap (play) occurs between the fixed member FM and the case 4, in front of or behind the bearing 38F.

[0197] [Sixth Embodiment] A sixth embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0198] Figure 29 is a longitudinal cross-sectional view showing the front part of the angle fastening tool 1A according to the sixth embodiment.

[0199] In the first embodiment, an example was shown in which the bevel gear 35 is a pinion gear fixed to the rotor shaft portion 33. However, in this sixth embodiment, the bevel gear 135 is provided separately from the pinion gear fixed to the rotor shaft portion 33, and the bevel gear 135 is provided on a different shaft from the rotor shaft portion 33.

[0200] The angle fastening tool 1A according to the sixth embodiment includes a bevel gear 135 that is indirectly rotated by a rotor 27 and has a shaft 111 that extends in the front-rear direction. The angle fastening tool 1A also includes a spur gear 112, which is a pinion gear, that is directly rotated by the rotor 27. The bevel gear 135 rotates around the shaft 111 due to the rotational force of the spur gear 112.

[0201] The spur gear 112 is fixed to the rotor shaft portion 33. The spur gear 112 is fixed by being press-fitted into the tip of the rotor shaft portion 33. The spur gear 112 rotates together with the rotor 27 (rotor shaft portion 33). The rotor shaft portion 33 is rotatably held by the rotor bearing 113F. The spur gear 112 meshes with the driven gear 114.

[0202] The driven gear 114 is a spur gear. The driven gear 114 is fixed to the rear end of the shaft 111. The driven gear 114 is fixed by being press-fitted to the rear end of the shaft 111. The driven gear 114 rotates together with the shaft 111 and the bevel gear 135. The driven gear 114 rotates by reducing the rotation of the spur gear 112. The driven gear 114 constitutes the first stage of the reduction gear of the reduction mechanism 7.

[0203] The shaft 111 extends along the front-rear direction. The shaft 111 is parallel to the rotation axis AX of the motor 6. The shaft 111 is housed in the case 4. The shaft 111 is positioned radially offset with respect to the rotation axis AX.

[0204] The bevel gear 135 is positioned in front of the spur gear 112 and the driven gear 114. The bevel gear 135 is either integrally formed with the end of the shaft 111 or fixed separately to the end of the shaft 111. The bevel gear 135 is housed in the case 4. The bevel gear 135 rotates around the central axis of the shaft 111. The bevel gear 135 meshes with the first intermediate gear 115A, which is provided on the intermediate shaft 115C.

[0205] The intermediate shaft 115C extends in a direction intersecting the rotation axis AX and axis 111. The intermediate shaft 115C extends along the vertical direction perpendicular to the rotation axis AX and axis 111 and is rotatable about a central axis in the vertical direction. Both ends of the intermediate shaft 115C are rotatably supported by intermediate bearings 116. The intermediate bearings 116 are held in case 4. The first intermediate gear 115A and the second intermediate gear 115B are fixed to the intermediate shaft 115C. The intermediate shaft 115C, the first intermediate gear 115A, and the intermediate shaft 115C rotate together. The first intermediate gear 115A meshes with the bevel gear 135. The first intermediate gear 115A is a bevel gear. The first intermediate gear 115A rotates by reducing the rotation of the bevel gear 135. The bevel gear 135 and the first intermediate gear 115A constitute the second stage of the reduction gear section 7. The second intermediate gear 115B is a spur gear. The second intermediate gear 115B meshes with the spindle gear 8C of the spindle 8. The spindle gear 8C rotates by reducing the rotation of the second intermediate gear 115B. The second intermediate gear 115B and the spindle gear 8C constitute the third stage of the reduction gear section 7.

[0206] The bearing 139 is supported by the case 4 and rotatably holds the bevel gear 135. The bearing 139 is in contact with the shaft 111 and rotatably supports the shaft 111. The bearing 139 rotatably holds the bevel gear 135 via the shaft 111.

[0207] The bearing 139 is housed in the housing recess 118 of the case 4. The housing recess 118 has a radial support surface 118A and a front support surface 118B. The bearing 139 is a ball bearing. In the example shown in Figure 29, two sets of bearings 139 are provided, arranged axially.

[0208] The intermediate support member 91E has a front surface that contacts the bearing 139. The intermediate support member 91E may be C-shaped or annular. In the sixth embodiment, the intermediate support member 91E is housed in the case 4. The intermediate support member 91E covers a portion of the rear opening of the housing recess 118. The intermediate support member 91E contacts the rear end surface of the outer ring of the rear bearing 139 located in the housing recess 118.

[0209] In the sixth embodiment, the fixing member FM is provided separately from the motor housing 21 and the case 4. In the sixth embodiment, the fixing member FM is made of metal and is a gear case that houses the spur gear 112 and the driven gear 114. The fixing member FM is positioned between the case 4 and the motor housing 21 so as to straddle the case 4 and the motor housing 21 in the front-rear direction.

[0210] The fixed member FM includes a first housing chamber 121 recessed from the front to the rear and a second housing chamber 122 recessed from the rear to the front. The first housing chamber 121 houses the spur gear 112 and the driven gear 114. The second housing chamber 122 houses the rotor bearing 113F. The second housing chamber 122 is continuous with the first housing chamber 121 in the front-rear direction. The tip of the rotor shaft portion 33 is positioned inside the first housing chamber 121, passing through the second housing chamber 122.

[0211] Case 4 has a front housing portion 119 that accommodates the front part of the fixing member FM. The front housing portion 119 is a recess that extends forward from the rear surface of Case 4. A housing recess 118 for the bearing 139 is formed on the front wall surface corresponding to the bottom surface of the front housing portion 119. The front housing portion 119 and the housing recess 118 are continuous. Therefore, the intermediate support member 91E is positioned on the front wall surface corresponding to the bottom surface of the front housing portion 119. The front part of the fixing member FM fits into the front housing portion 119. As a result, the fixing member FM contacts the rear surface of the intermediate support member 91E at its front surface. The fixing member FM contacts the rear surface of the intermediate support member 91E at the front end surface portion of the peripheral wall that partitions the first housing chamber 121.

[0212] The motor housing 21 has a rear housing portion 120 that accommodates the rear of the fixing member FM. The rear housing portion 120 is a recess that extends from the front to the rear of the motor housing 21. The rear of the fixing member FM fits into the rear housing portion 120. Although not shown, the motor housing 21 and the case 4 are connected in the front-rear direction and fastened together by screws 70 oriented in the front-rear direction, similar to the first embodiment. The motor housing 21 and the case 4 are tightened together in the front-rear direction by the axial force of the screws 70, bringing them closer to each other. As a result, the bearing 139, the intermediate support member 91E, and the fixing member FM are sandwiched between the motor housing 21 and the case 4 and held in place by the axial force of the screws 70. Consequently, the fixing member FM, together with the case 4, fixes the intermediate support member 91E solely by sandwiching it. The intermediate support member 91E is simply positioned in the front housing section 119 and is fixed in place by being sandwiched between the front surface of the fixing member FM and the front support surface 118B of the case 4, together with the bearing 139.

[0213] [Other embodiments] In the above-described embodiment, the multiple light-emitting elements 53 do not have to be arranged along the circumferential direction of the anvil 10. The multiple light-emitting elements 53 may be arranged radially in the radial direction of the anvil 10, for example. The optical member 57 does not have to be annular surrounding the anvil 10, and may have a shape corresponding to the arrangement of the multiple light-emitting elements 53. The optical member 57 may be, for example, arc-shaped, square-shaped, radial, etc. The optical member 57 may be provided individually for each light-emitting element 53. The multiple light-emitting elements 53 only need to be held in the case 4, and may be arranged at the rear of the bottom surface of the case 4, or at the lower part of the side surface, etc. For example, the light-emitting elements 53 may emit light diagonally downward from the rear of the bottom surface of the case 4 toward the bottom of the anvil 10. There do not have to be multiple light-emitting elements 53; there may be only one.

[0214] In the above embodiment, the angle fastening tool 1 is an impact wrench. The angle fastening tool 1 may also be an impact driver. When the angle fastening tool 1 is an impact driver, the tip tool holder 51 includes a bit hole provided at the lower end of the anvil shaft portion 10A. The bit hole is provided so as to extend rearward from the front end of the anvil shaft portion 10A. The driver bit, which is the tip tool, is held in a state where it is inserted into the bit hole. In this case, the tip tool holder 51 may be equipped with a tool holding mechanism that is inserted into the bit hole and holds the driver bit in a detachable manner.

[0215] Furthermore, the angle fastening tool 1 may be an angle fastening tool other than an impact tool. In other words, the angle fastening tool 1 does not need to include a striking mechanism 9 including a hammer 47 and an anvil 10. In this case, the tip tool holder 51 may be provided at the tip of the spindle 8 and rotate together with the spindle 8, or it may be provided separately from the spindle 8 and rotated by the spindle 8 via a power transmission mechanism. Examples of angle fastening tools 1 other than impact tools include electric ratchet wrenches, electric angle drivers, and electric angle drills.

[0216] In the above embodiment, the support wall 21G indirectly supports the rear surface of the bearing 38F via the intermediate support member 91, but the intermediate support member 91 may not be provided, and the support wall 21G may directly support the rear surface of the bearing 38F.

[0217] In the embodiment described above, the power source for the angle fastening tool 1 does not have to be the battery 25, but may also be a commercial power source (AC power source).

[0218] [Seventh Embodiment] A seventh embodiment will now be described. In the following description, components that are the same as or equivalent to those in the embodiments described above will be denoted by the same reference numerals, and the descriptions of those components will be simplified or omitted.

[0219] Figure 30 is a perspective view from below showing the front of the angle fastening tool 1B according to the seventh embodiment. Figure 31 is a bottom view showing the front of the angle fastening tool 1B according to the seventh embodiment.

[0220] In the first embodiment, an example was shown in which the light unit 17 has an annular shape surrounding the anvil 10. However, the light unit 201 according to this seventh embodiment has a non-annular shape and is located further away from the anvil 10 than in the first embodiment.

[0221] The light unit 201 is positioned on the lower surface of the case 4. The light unit 201 is positioned around the cylindrical portion 82. The light unit 201 is positioned around the anvil 10 via the cylindrical portion 82. In the seventh embodiment, the light unit 201 does not surround the anvil 10, but is provided to be localized behind the anvil 10.

[0222] The light unit 201 includes multiple light-emitting elements 53. The light-emitting elements 53 are held in the case 4. The light-emitting elements 53 are held on the lower surface of the case 4. Multiple light-emitting elements 53 are provided around the anvil 10.

[0223] In the seventh embodiment, the multiple light-emitting elements 53 are arranged along the radial direction of the anvil 10. The multiple light-emitting elements 53 are positioned behind the anvil 10 in the radial direction. The multiple light-emitting elements 53 are arranged in a straight line behind the anvil 10. The multiple light-emitting elements 53 may also be arranged along the rotational direction (circumferential direction) of the anvil 10, or in a straight line along the left-right direction. The arrangement of the multiple light-emitting elements 53 is not limited to a straight line; it may also be arranged in a planar (array) pattern in a predetermined pattern such as vertically and horizontally.

[0224] Figure 32 is an exploded perspective view from below showing the mounting of the light cover 204 to the case 4 according to the seventh embodiment. Figure 33 is a longitudinal cross-sectional view along the front-to-rear direction showing the light unit 201 according to the seventh embodiment.

[0225] The light unit 201 has a substrate 202 on which a plurality of light-emitting elements 53 are provided, and an optical member 203. The substrate 202 is formed in a linear (rectangular) shape along the front-to-back direction, corresponding to the linear arrangement of the plurality of light-emitting elements 53. Multiple light-emitting elements 53 are arranged on the lower surface of the substrate 202, spaced apart in the front-to-back direction. In this embodiment, two light-emitting elements 53 are provided. The number of light-emitting elements 53 may be one or three or more. By providing multiple light-emitting elements 53, sufficient light intensity and light irradiation range can be ensured.

[0226] The optical member 203 is positioned to cover the front of the multiple light-emitting elements 53. At least a portion of the optical member 203 is positioned in front of the light unit 201. The optical member 203 is continuous, spanning across the multiple light-emitting elements 53. The light-transmitting portion 203B of the optical member 203 faces the multiple light-emitting elements 53. The light-transmitting portion 203B covers two light-emitting elements 53 together.

[0227] A portion of the optical element 203 is covered from below by the light cover 204. The portion of the optical element 203 that covers the multiple light-emitting elements 53 is exposed and not covered by the light cover 204. That is, the light-transmitting portion 203B that covers the multiple light-emitting elements 53 is exposed downwards through the opening 205A of the light cover 204. Light from the multiple light-emitting elements 53 passes through the light-transmitting portion 203B and exits downwards towards the case 4 through the opening 205A of the light cover 204.

[0228] As shown in Figures 32 and 33, the optical member 203 is formed in a case-like shape that covers a plurality of light-emitting elements 53 and a substrate 202, with the top side open. The optical member 203 has a side wall portion 203A, a light-transmitting portion 203B, and a protruding portion 203C.

[0229] The side wall portion 203A is rectangular in shape. A substrate 202 on which multiple light-emitting elements 53 are mounted is placed inside the side wall portion 203A. The side wall portion 203A surrounds the multiple light-emitting elements 53 and the substrate 202 all around (front, back, left, and right). The top surface of the side wall portion 203A is an open opening. The light-transmitting portion 203B closes the bottom surface of the side wall portion 203A. The light-transmitting portion 203B constitutes the bottom surface of the optical member 203. The side wall portion 203A and the light-transmitting portion 203B constitute an optical member 203 that is roughly rectangular in shape with an open top surface. The light-transmitting portion 203B is rectangular (rounded rectangle) when viewed from below. The light-transmitting portion 203B faces the bottom surface of the substrate 202. The light-transmitting portion 203B faces the light-emitting elements 53 in the vertical direction. Light emitted from the light-emitting element 53 passes through the light-transmitting section 203B. The lower surface of the light-transmitting section 203B constitutes the light-emitting surface of the light unit 201. The light-transmitting section 203B protrudes downward from the lower end of the side wall section 203A. When viewed from below, the light-transmitting section 203B is formed in a rectangular shape that is slightly smaller than the outer shape of the side wall section 203A. For this reason, a stepped shoulder section 203D (see Figure 33) is formed at the boundary between the lower end of the side wall section 203A and the outer circumference of the light-transmitting section 203B.

[0230] The protrusion 203C is provided so as to project laterally from the side wall portion 203A. In the seventh embodiment, the protrusion 203C projects to the left from the left side of the side wall portion 203A. By being positioned inside the guide groove 214A of the case 4, the protrusion 203C functions as a positioning portion for the light unit 201 relative to the case 4.

[0231] As shown in Figure 33, the upper surface of the substrate 202 is positioned below the upper end of the side wall portion 203A. The substrate 202 and the multiple light-emitting elements 53 are placed in a concave housing space formed by the side wall portion 203A and the light-transmitting portion 203B of the optical member 203. Molding resin 58 is filled into the housing space. The molding resin 58 fixes the multiple light-emitting elements 53, the substrate 202, the optical member 203, and a portion of the lead wire 65 to each other. Note that the molding resin 58 may be omitted.

[0232] Case 4 holds the light unit 201. The light unit 201, which includes multiple light-emitting elements 53, is held on the underside of case 4. An angle fastening tool 1B is positioned on the underside of case 4 and includes a light cover 204 that holds the light-emitting elements 53 and covers the lead wires 65.

[0233] The light cover 204 is separate from the motor housing 21. The light cover 204 is separate from the case 4. The light cover 204 engages with the motor housing 21. The light cover 204 is mounted on the lower surface of the case 4. The light cover 204 holds the light unit 201 on the lower surface of the case 4. The light unit 201 is held between the lower surface of the case 4 and the light cover 204.

[0234] The light cover 204 is a single component in which the light-emitting element holding portion 205 and the cover portion 206 are integrally formed.

[0235] The light-emitting element holder 205 is positioned on the lower surface of the case 4 and holds a plurality of light-emitting elements 53. The light-emitting element holder 205 is positioned on the lower surface of the case 4, adjacent to the cylindrical portion 82 on the rear side. The light-emitting element holder 205 covers the area around the installation position of the light unit 201. An opening 205A is formed in the light-emitting element holder 205, exposing the light-transmitting portion 203B of the optical member 203. The opening 205A penetrates from the lower surface to the upper surface of the light-emitting element holder 205. The light-transmitting portion 203B is positioned inside the opening 205A. The opening 205A is formed to have substantially the same planar shape as the light-transmitting portion 203B, allowing for dimensional tolerances. The peripheral edge of the opening 205A contacts the shoulder portion 203D of the optical member 203. As shown in Figure 33, the light-emitting element holder 205 supports the shoulder portion 203D (the lower end of the side wall portion 203A) of the optical member 203 from below at the periphery of the opening 205A. In this way, the light-emitting element holder 205 supports the entire light unit 201, including the light-emitting element 53, from below by supporting the shoulder portion 203D of the optical member 203.

[0236] As shown in Figures 31 and 32, the light-emitting element holder 205 is fixed to the lower surface of the case 4 by a screw 60S, which tightens the light-emitting element holder 205 toward the lower surface of the case 4. The light-emitting element holder 205 holds multiple light-emitting elements 53 by pressing the lower surface (shoulder portion 203D) of the optical member 203 toward the case 4 with the peripheral edge of the opening 205A. The light-emitting element holder 205 presses the outer peripheral edge of the lower surface of the optical member 203. The light-emitting element holder 205 may also simply support the optical member 203 from below without pressing it.

[0237] As shown in Figure 32, the light-emitting element holder 205 is fixed to the optical member 203 at multiple locations by screws 60S. Specifically, the light-emitting element holder 205 is fixed to the light unit 201 at two locations on both sides in the left-right direction by two screws 60S. Screw holes 211A are formed in the flat mounting surface 211 on the lower surface of the case 4. In the seventh embodiment, the mounting surface 211 is the bottom surface of the groove 212. The two screw holes 211A are located on both the left and right sides of the light source arrangement section 213 where the light unit 201 is placed. The light-emitting element holder 205 has through holes 205B into which the screws 60S are attached. The screws 60S pass through the through holes 205B of the light-emitting element holder 205 from below and are fixed to the screw holes 211A.

[0238] The cover portion 206 covers the lead wire 65. The lead wire 65 extends from the light unit 201 to the motor housing portion 21 along the bottom surface of the case 4. In other words, the lead wire 65 extends from the lower opening 21D on the front of the motor housing portion 21 to the bottom surface of the case 4. The lead wire 65 extends forward along the bottom surface of the case 4 and connects to the circuit board 202 of the light unit 201. The lead wire 65 connects to multiple light-emitting elements 53 on the circuit board 202 to supply power.

[0239] Figure 34 is a bottom view showing the front of the angle fastening tool 1B with the light cover 204 removed according to the seventh embodiment. As shown in Figure 34, in the seventh embodiment, the lead wire 65 is not provided with a connector (connector 66A and connector 66B) and is directly connected to the circuit board 202 of the light unit 201.

[0240] As shown in Figures 32 and 34, the case 4 has a groove 212 on its lower surface for arranging the lead wires 65. The groove 212 is a concave portion that is recessed upward from the lower surface of the case 4. The groove 212 is provided on the lower surface of the case 4, along the front-rear direction, from the rear end of the cylindrical portion 82 to the rear end of the case 4. The lead wires 65 are arranged in the groove 212.

[0241] In the seventh embodiment, the case 4 has a light source arrangement section 213 on the lower surface of the case 4 in which a plurality of light-emitting elements 53 are arranged. The light source arrangement section 213 is located on the lower surface of the case 4, behind the rear end of the cylindrical portion 82. The light source arrangement section 213 is located at a predetermined position inside the groove portion 212.

[0242] Specifically, a guide wall 214 is formed on the mounting surface 211, which is the bottom surface of the groove 212, rising downward from the mounting surface 211. The guide wall 214 defines the placement positions of the light source placement section 213 and the lead wires 65 within the groove 212. Two screw holes 211A are formed inside the groove 212 and outside the guide wall 214. The guide wall 214 is formed to surround the light source placement section 213 (in the front and left / right directions). The light unit 201 and optical member 203 are placed in the light source placement section 213 surrounded by the guide wall 214. A guide groove 214A is formed in a part of the guide wall 214 surrounding the light source placement section 213. The guide groove 214A is a recessed groove formed by partially cutting out the guide wall 214, and is formed on the guide wall 214 to the left of the light source placement section 213. The protrusion 203C of the optical element 203 is positioned in this guide groove 214A. This determines the in-plane position (front-to-back and left-to-right direction) of the light unit 201.

[0243] The guide wall 214 leaves the rear side of the light source placement section 213 open. The guide wall 214 extends from both the left and right sides of the light source placement section 213 toward the rear. The lead wire 65 is placed in the area between the guide walls 214 on both the left and right sides. Also, the ground wire 67, which connects to the ground terminal 84B, is placed in the area between the guide walls 214 on both the left and right sides. The lead wire 65 and the ground wire 67 are located inside the same groove 212 and in the area between the guide walls 214 on both the left and right sides.

[0244] The guide wall 214 forms a narrow passage 84A at its rear end. The passage 84A extends to the rear surface of the case 4. The lead wire 65 and ground wire 67 extending from the lower opening 21D (see Figure 32) of the motor housing 21 pass through the passage 84A.

[0245] As shown in Figure 32, the cover portion 206 covers the lead wire 65 and the ground wire 67. The cover portion 206 extends rearward from the rear end of the light-emitting element holding portion 205. The cover portion 206 extends to the front of the motor housing portion 21.

[0246] The cover portion 206 has a claw portion 62A that engages with the motor housing portion 21. The claw portion 62A protrudes rearward from the rear end of the cover portion 206. The claw portion 62A engages with the motor housing portion 21 by being inserted into the lower opening 21D of the motor housing portion 21. The rear end of the cover portion 206 is movable in the front-rear direction but not downward due to the engagement between the motor housing portion 21 and the claw portion 62A. The cover portion 206 is fixed to the case 4 with the claw portion 62A engaged with the motor housing portion 21. The cover portion 206 covers the entire lower opening 21D of the motor housing portion 21.

[0247] The light cover 204, which includes the light-emitting element holding portion 205 and the cover portion 206, covers the lower surface of the case 4 from the rearward side of the cylindrical portion 82. The light cover 204 fits inside the groove portion 212 and covers the groove portion 212. The light cover 204 covers the portion of the optical element 203 other than the light-transmitting portion 203B, while exposing the light-transmitting portion 203B.

[0248] When assembling the angle fastening tool 1B, the assembler places the light unit 201 and optical element 203 in the light source placement section 213, positions the lead wires 65 and ground wires 67 within the area between the guide walls 214, and then attaches the light cover 204 to the case 4. The light cover 204 is fixed to the case 4 by two screws 60S that pass through the insertion holes 205B, with the claw portion 62A inserted and engaged into the lower opening 21D of the motor housing section 21. When the light cover 204 is fixed to the case 4, the light unit 201, positioned by the guide groove 214A, is placed within the opening 205A of the light cover 204. The periphery of the opening 205A holds the optical element 203 between the light cover 204 and the lower surface of the case 4.

[0249] Figure 35 is a longitudinal cross-sectional view showing the front of the angle fastening tool 1B according to the seventh embodiment. Next, the placement position of the light-emitting element 53 according to the seventh embodiment will be described with reference to Figure 35.

[0250] In the seventh embodiment, the light-emitting element 53 is held on the lower surface of the housing portion of the case 4 for the reduction gear mechanism 7.

[0251] The reduction gear 7 is housed in the case 4 and transmits the rotational force of the motor 6 to the spindle 8. The reduction gear 7 is connected to the bevel gear 35, which is the pinion gear of the motor 6, and to the spindle gear 8C of the spindle 8. In the front-rear direction, the reduction gear 7 is positioned between the bearing 38F, which rotatably holds the bevel gear 35, and the spindle 8. The reduction gear 7 is positioned behind the spindle 8 and connects to the spindle 8 from the rear. The reduction gear 7 includes a first reduction unit 41 connected to the bevel gear 35 (pinion gear) and a second reduction unit 42 connected to the first reduction unit 41 and the spindle gear 8C. The first reduction unit 41 and the second reduction unit 42 are aligned in the front-rear direction. The second reduction unit 42 is positioned in front of the first reduction unit 41.

[0252] Multiple light-emitting elements 53, i.e., the light unit 201, are positioned on the lower surface of the case 4, overlapping vertically with the reduction gear mechanism 7. More specifically, the multiple light-emitting elements 53 overlap vertically with the second reduction gear 42 of the reduction gear mechanism 7. The multiple light-emitting elements 53 are positioned on the lower surface of the housing portion of the case 4 that contains the second intermediate gear 42A and the second intermediate shaft 42B, which constitute the second reduction gear 42. The multiple light-emitting elements 53 are positioned on the lower surface of the end portion of the housing portion of the reduction gear mechanism 7 that is on the spindle 8 side.

[0253] In the example shown in Figure 35, the housing space of case 4 can be understood as being divided into multiple parts. That is, case 4 includes a first part 221 that houses the spindle 8 and hammer 47, and a second part 222 that is continuous with the rear of the first part 221. In the seventh embodiment, the light-emitting element 53 is held on the lower surface of the second part 222 of case 4.

[0254] In detail, the first part 221 of case 4 houses a striking mechanism 9 including a spindle 8 and a hammer 47, and an anvil 10 is positioned to protrude downward from the lower surface (cylindrical portion 82) of the first part 221.

[0255] The second part 222 of case 4 houses the reduction gear 7. The first part 221 and the second part 222 are separated by a first bulkhead 224. The second intermediate gear 42A of the second reduction gear 42 passes over the first bulkhead 224 and meshes with the spindle gear 8C. The first bulkhead 224 defines the front end of the housing space for the reduction gear 7.

[0256] In the example shown in Figure 35, case 4 includes a third portion 223 following a second portion 222. The third portion 223 has a housing recess 85 that accommodates a bearing 38F. The second portion 222 and the third portion 223 are separated by a second partition wall 225 with a hole 88. The driven gear 41A of the first reduction gear 41 meshes with the bevel gear 35 that passes through the hole 88. The second partition wall 225 defines the rear end of the housing space of the reduction gear mechanism 7.

[0257] The multiple light-emitting elements 53, i.e., the light unit 201, are positioned on the underside of the second part 222 between the first part 221 and the third part 223. With respect to their front-to-back position, the multiple light-emitting elements 53 are positioned either vertically overlapping with the first bulkhead 224 or behind the first bulkhead 224. The multiple light-emitting elements 53 are positioned either vertically overlapping with the second bulkhead 225 or in front of the second bulkhead 225. The multiple light-emitting elements 53 are positioned on the first part 221 side of the second part 222, i.e., the side closer to the anvil 10. Therefore, the multiple light-emitting elements 53 are positioned behind the spindle 8 and the striking mechanism 9, and close to the anvil 10. In the case of an impact wrench, a socket is attached to the tip tool holder 51 of the anvil 10 as a tip tool, and the outer diameter of the socket may be large depending on the size of the bolt or other fastening to be fastened. In the seventh embodiment, the light unit 201 is positioned in the vicinity of the anvil 10 but at a suitable distance, so that even when a large cutting tool is attached, shadows are less likely to be formed due to the light from the light unit 201 being blocked by the cutting tool.

[0258] Incidentally, in angle fastening tools used for fastening work in confined spaces, it is desirable that the vertical dimension of the front end (head) of the case 4, where the tip tool holder 51 is provided, be small. In the example shown in Figure 35, the vertical dimension of the head is suppressed by suppressing the vertical dimension of each sliding surface that rotatably supports the spindle 8 and the anvil 10. Specifically, the vertical dimensions of the sliding surface of the spindle bearing 44 that rotatably supports the upper end of the spindle 8, the sliding surface 47E of the hammer 47 with the spindle 8, and the sliding surface of the anvil bearing 46 are suppressed. The vertical dimension of the sliding surface of the spindle bearing 44 is smaller than the vertical dimension of the sliding surface of the intermediate bearing 42C that supports the second intermediate shaft 42B of the reduction mechanism 7. Both the spindle bearing 44 and the intermediate bearing 42C are sliding bearings. The vertical dimension of the sliding surface 47E of the hammer 47 with the spindle 8 is 1 / 2 or less of the vertical dimension Hs of the through hole through which the spindle 8 of the hammer 47 is inserted. The vertical dimension of the sliding surface of the anvil bearing 46 is 26% or less of the vertical dimension (total length) of the anvil 10.

[0259] FIG. 36 is a longitudinal sectional view showing the angle fastening tool 1B according to the seventh embodiment. FIG. 37 is a longitudinal sectional view showing an intermediate portion of the angle fastening tool 1B according to the seventh embodiment. FIG. 38 is a longitudinal sectional view for explaining the vertical positional relationship of each part of the angle fastening tool 1B according to the seventh embodiment.

[0260] Next, referring to FIGS. 36 to 39, the positional relationship of each part of the angle fastening tool 1B according to the seventh embodiment will be described. First, the vertical positional relationship of each part will be described.

[0261] As shown in FIG. 36, also in the seventh embodiment, as in the first embodiment, in the vertical direction, the lower end portion 14B of the trigger lever 14 is disposed closer to the lower surface 21P of the motor housing portion 21 than the lower end portion of the tip tool holding portion 51. The lower surface 21P of the motor housing portion 21 is located above the lower end portion of the tip tool holding portion 51. The vertical distance H2 from the lower end portion 14B of the trigger lever 14 to the lower surface 21P of the motor housing portion 21 is smaller than the vertical distance H1 from the lower end portion 14B of the trigger lever 14 to the lower end portion of the tip tool holding portion 51. The lower end portion 14B of the trigger lever 14 may be above the lower surface 21P of the motor housing portion 21.

[0262] As shown in FIG. 37, the trigger lever 14 includes a pressing surface 301 that is pressed when pulled. The trigger lever 14 includes a rotation axis 302 that rotates the pressing surface 301 with the pressing. The pressing surface 301 is a portion of the trigger lever 14 that is exposed without being covered by the housing 2 and is a surface pressed by a finger. The rotation axis 302 is a columnar member that extends in the left - right direction deeper than the cross - section shown in FIG. 37. The rotation axis 302 is rotatably supported by the housing 2. The rotation axis 302 and the pressing surface 301 are connected by a rotation arm 303. When the pressing surface 301 is pressed upward by a pulling operation, the trigger lever 14 rotates toward the switch body 14A about the rotation axis 302, and the switch body 14A is operated.

[0263] The pressing surface 301 extends to the lower end 14B of the trigger lever 14 and is curved in a concave shape. The concave curve of the pressing surface 301 makes it easier for the fingers to fit onto the pressing surface 301 when pulling the lever.

[0264] Specifically, the pressing surface 301 has a first end 301A, a second end 301B, and an intermediate section 301C. The first end 301A is located at the lower end 14B of the trigger lever 14. The second end 301B is the end on the opposite side (front side) from the first end 301A. The portion of the trigger lever 14 in front of the second end 301B is covered by the housing 2. The intermediate section 301C is the portion between the first end 301A and the second end 301B. The intermediate section 301C is a concave portion that curves upward. The intermediate section 301C curves above the first end 301A and the second end 301B. The deep curvature of the intermediate section 301C above the first end 301A and the second end 301B makes it easier to hold the fingers on the pressing surface 301.

[0265] As shown in Figure 36, the intermediate portion 301C is located above the lower surface 21P of the motor housing portion 21 and below the lower surface of the grip 22A. Therefore, even when fingers are placed on the pressing surface 301, the fingers are less likely to protrude below the lower surface 21P of the motor housing portion 21.

[0266] Figures 36 to 38 show an example in which a smaller battery 325 than the one in Figure 4 is mounted in the battery holder 23. In this case, the lower end 14B of the trigger lever 14 is located above the lower surface of the battery 325. The lower surface of the battery 325 is located below the lower end 14B of the trigger lever 14 and above the lower end of the tip tool holder 51.

[0267] As shown in Figure 38, the lower end 14B of the trigger lever 14 is located above the straight line 311 connecting the lower end of the tip tool holder 51 and the rear end of the lower surface of the battery 325. The straight line 311 connecting the lower end of the tip tool holder 51 and the rear end of the lower surface of the battery 325 is a part that may come into contact with the mounting surface when the angle fastening tool 1B is placed facing downwards on a mounting surface such as a workbench. Because the lower end 14B of the trigger lever 14 is located above the straight line 311, even when the angle fastening tool 1B is placed in a position where the tip tool holder 51 is facing downwards, the trigger lever 14 is less likely to come into contact with the mounting surface or objects on the mounting surface.

[0268] Furthermore, as shown in Figure 38, the operation panel 16 is located below the straight line 312 that connects the front upper end position UF, which is the uppermost position of the motor housing 21 and case 4, and the rear upper end position UR, which is the uppermost position of the grip 22 and battery holding 23. The straight line 312 connecting the front upper end position UF and the rear upper end position UR is a part that may come into contact with the mounting surface when the angle fastening tool 1B is placed facing upward on a mounting surface such as a workbench. The operation panel 16 is exposed on the upper surface of the motor housing 21. Because the operation panel 16 is located below the straight line 312, even when the angle fastening tool 1B is placed in a position where the tip tool holding part 51 is facing upward, the operation panel 16 is less likely to come into contact with the mounting surface or objects on the mounting surface.

[0269] In the example shown in Figure 38, the front upper end position UF is the upper surface near the connection point between the motor housing 21 and the case 4. In the example shown in Figure 38, the rear upper end position UR is the upper surface of the battery holding section 23.

[0270] Figure 39 is a perspective view of the battery holding portion 23 of the angle fastening tool 1B according to the seventh embodiment, viewed from the rear and diagonally above. As shown in Figure 39, the battery holding portion 23 has a dome-shaped portion 23A that bulges upward. The upper surface of the dome-shaped portion 23A includes the rear upper end position UR. Due to the upward bulge of the dome-shaped portion 23A, the upper surface of the battery holding portion 23 (rear upper end position UR) is positioned above the upper surface of the grip portion 22.

[0271] On the upper surface of the angle fastening tool 1B, the area between the front upper end position UF and the rear upper end position UR is less likely to come into contact with the mounting surface or objects on the mounting surface, even when the angle fastening tool 1B is placed in a position where the tip tool holder 51 is facing upwards.

[0272] Furthermore, as shown in Figure 38, the controller 18 is positioned behind the switch board 16C. The controller 18 is located in the battery holding section 23. The controller 18 is located inside the dome-shaped section 23A. The internal space of the dome-shaped section 23A has a large vertical height. Therefore, even when tall electronic components 18H, such as discrete capacitors, are mounted on the controller 18, sufficient space for the controller 18 can be secured.

[0273] Next, we will explain the positional relationship of each part in the front-to-back direction.

[0274] As shown in Figure 37, in the seventh embodiment, similar to the first embodiment, the switch board 16C is positioned in front of the trigger lever 14 and overlaps with the motor 6 in the vertical direction. The front end 16F of the switch board 16C overlaps with the rear of the motor 6 in the vertical direction, and the rear end 16R overlaps with the front of the trigger lever 14 in the vertical direction. The switch board 16C extends in the front-rear direction and is positioned across the position above the motor 6 and the position above the trigger lever 14.

[0275] The front end 16F of the switch board 16C is positioned in front of the rear end of the motor 6. The front end 16F of the switch board 16C is positioned in front of the rear bearing 38R. The rear end 16R of the switch board 16C is positioned behind the front of the trigger lever 14.

[0276] Furthermore, the front-to-back distance L3 between the trigger lever 14 and the rear bearing 38R of the motor 6 is smaller than the front-to-back length L10 of the switch board 16C (the distance between the front end 16F and the rear end 16R).

[0277] Furthermore, in the front-to-back direction, the distance L11 from the center of the pivot shaft 302 to the operation button 16A is smaller than the distance L12 from the center of the pivot shaft 302 to the rear end of the pressing surface 301 (i.e., the first end 301A). Since the operation button 16A and the trigger lever 14 are located close together in the front-to-back direction, operability is improved, such as being able to operate both the operation button 16A and the trigger lever 14 with one hand.

[0278] Figure 40 is a longitudinal cross-sectional view illustrating the front-to-back positional relationship of each part of the angle fastening tool 1B according to the seventh embodiment.

[0279] In angle fastening tool 1B, which is used for work in confined spaces, it is assumed that the worker will hold the angle fastening tool 1B at a distance from their body by reaching out, and that the fastening work will be performed with the tip tool holder 51 facing in various directions. Compared to pistol-type power tools, it is desirable that the angle fastening tool 1B be easier to operate even when fastening work is performed at any angle and in any direction.

[0280] Figure 40 shows the center of gravity CG of the angle fastening tool 1B with the battery 325 installed. In the angle fastening tool 1B, the motor 6 and the components housed in the case 4 in front of the motor 6 (reduction mechanism 7, spindle 8, impact mechanism 9, and anvil 10), including the case 4, are mainly made of metal, so there is a heavy object at the front. On the other hand, the angle fastening tool 1B holds the heavy battery 325 at the battery holding part 23 at the rear end. The grip part 22 and trigger lever 14 located between the battery 325 and the motor 6 are relatively light, so they have little effect on the center of gravity CG. For this reason, the center of gravity CG is usually biased towards the front where the heavy object is concentrated, and the center of gravity CG tends to be farther away from the grip part 22 (trigger lever 14). The further the center of gravity CG is from the grip part 22 (trigger lever 14), the more force is required to change and maintain the posture of the angle fastening tool 1B, and the operability (ease of handling) of the angle fastening tool 1B decreases.

[0281] As shown in FIG. 40, in the seventh embodiment, similar to the first embodiment, the front-back direction distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-back direction distance L2 between the trigger lever 14 and the controller 18. The front-back direction distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-back direction distance L4 between the trigger lever 14 and the battery holding portion 23. Since 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).

[0282] In the example of FIG. 40, in the state where the battery 325 is mounted, the center of gravity position CG is closer to the lower end portion 14B of the trigger lever 14 than the tip tool holding portion 51 in the front-back direction. In the state where the battery 325 is mounted, the center of gravity position CG is closer to the trigger lever 14 than the tip tool holding portion 51 in the front-back direction. The center of gravity position CG is closer to the trigger lever 14 than the second intermediate shaft 42B in the front-back direction. The center of gravity position CG is closer to the trigger lever 14 than the first intermediate shaft 41C in the front-back direction.

[0283] In FIG. 40, the center of gravity position CG is between the front end portion of the motor 6 and the lower end portion 14B of the trigger lever 14 (inside the range 330) in the front-back direction. Specifically, in the state where the battery 325 is mounted, the center of gravity position CG is located between the front end portion 16F and the rear end portion 16R of the switch substrate 16C in the front-back direction. That is, in the state where the battery 325 is mounted, the center of gravity position CG is located behind the front end portion 16F of the switch substrate 16C in the front-back direction. The center of gravity position CG is located in front of the rear end portion 16R of the switch substrate 16C in the front-back direction. In the example of FIG. 40, in the state where the battery 325 is mounted, the center of gravity position CG is located between the rotor core portion 32 and the rear bearing 38R.

[0284] In the example shown in Figure 40, the battery 325 is a smaller type than the battery 25 in Figure 4. Since the battery 325 is heavier than the battery 25, the center of gravity position CG is shifted rearward in the case of Figure 4. Even when the battery 25 from Figure 4 is installed, the center of gravity position CG is located in front of the trigger lever 14 in the front-to-back direction. When the battery 25 from Figure 4 is installed, the center of gravity position CG is even closer to the trigger lever 14 than the position shown in Figure 40.

[0285] Next, the shape of the grip portion 22 will be described. As shown in Figure 36, in the seventh embodiment, similar to the first embodiment, the circumference of the narrowest part 22N of the grip portion 22 is smaller than the circumference of the narrowest part 21N of the motor housing portion 21.

[0286] Figure 41 is a cross-sectional view of the grip portion 22 according to the seventh embodiment, viewed from the front. Figure 41 shows the cross-section of the narrowest part 22N of the grip portion 22. As shown in Figure 41, the cross-section of the grip portion 22 perpendicular to the front-rear direction has a width W12 in the left-right direction that is smaller than the width W11 in the up-down direction. The cross-sectional shape of the grip portion 22 perpendicular to the front-rear direction is barrel-shaped. That is, the cross-sectional shape of the grip portion 22 has a maximum left-right dimension (width W12) at the center in the up-down direction, and the left-right dimension decreases as it approaches the upper and lower ends. Also, the cross-sectional shape of the grip portion 22 has a maximum up-down dimension (width W11) at the center in the left-right direction, and the up-down dimension decreases as it approaches the right and left ends. The outer circumference of the grip portion 22 is composed of smooth curves and has no corners. This makes it easier for the grip portion 22 to fit snugly in the hand when the worker grasps the grip portion 22 with their hand, enabling a stable grip.

[0287] (effect) As described above, in the seventh embodiment, the angle fastening tool 1B includes a grip portion 22 extending in the front-rear direction, a motor housing portion 21 positioned in front of the grip portion 22, a motor 6 positioned inside the motor housing portion 21, a spindle 8 positioned in front of the motor 6 and extending in a direction intersecting the front-rear direction and rotated by the motor 6, a case 4 housing the spindle 8, a tip tool holder portion 51 protruding downward from the lower surface of the case 4 and rotated by the spindle 8, and a trigger lever 14 provided so as to protrude downward from the lower surface of the grip portion 22. In the vertical direction, the lower end portion 14B of the trigger lever 14 is positioned closer to the lower surface 21P of the motor housing portion 21 than the lower end portion of the tip tool holder portion 51.

[0288] In the above configuration, in the vertical direction, the lower end 14B of the trigger lever 14 is positioned closer to the lower surface 21P of the motor housing 21 than the lower end of the tip tool holding portion 51. As a result, the trigger lever 14 is positioned close to the fingers gripping the grip portion 22 without protruding too far downward, improving operability when the operator grips the grip portion 22. In addition, when inserting the angle fastening tool 1B into a narrow space, the trigger lever 14 or the fingers on the trigger lever 14 are less likely to come into contact with surrounding structures, reducing the possibility of unintentional operation. These improvements enhance the operability of the angle fastening tool 1B.

[0289] In the seventh embodiment, the trigger lever 14 includes a pressing surface 301 that is pressed when pulled. The pressing surface 301 extends to the lower end 14B of the trigger lever 14 and is curved in a concave shape.

[0290] In the above configuration, the concave shape of the pressing surface 301 makes it easier to place fingers on the trigger lever 14, improving operability.

[0291] In the seventh embodiment, the pressing surface 301 has a first end 301A located at the lower end 14B of the trigger lever 14, a second end 301B on the opposite side of the first end 301A, and a concave intermediate portion 301C that curves upward from the first end 301A and the second end 301B.

[0292] In the above configuration, the intermediate section 301C is curved in a concave shape to a deeper position above the first end 301A and the second end 301B, so that the fingers can fit into the intermediate section 301C, stabilizing the finger position and making it less likely for the fingers to shift position. This allows for accurate operation of the trigger lever 14 even when working with the angle fastening tool 1B inserted into a narrow space.

[0293] In the seventh embodiment, the grip portion 22 has a grip 22A located behind the trigger lever 14. 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.

[0294] In the above configuration, the intermediate section 301C is positioned above the lower surface 21P of the motor housing section 21, so even when working with the angle fastening tool 1B in a confined space, the trigger lever 14 and the fingers on the trigger lever 14 can be effectively prevented from coming into contact with surrounding structures. In addition, the intermediate section 301C is close to the grip 22A, making it easy to pull the trigger lever 14.

[0295] In the seventh embodiment, the angle fastening tool 1B includes a battery holder 23 connected to the rear end of the grip portion 22, which detachably holds the battery 325. The lower end 14B of the trigger lever 14 is located above the lower surface of the battery 325.

[0296] In the above configuration, the lower end 14B of the trigger lever 14 is positioned above the lower surface of the battery 325, so that the trigger lever 14 and the fingers resting on it do not come into contact with surrounding structures.

[0297] In the seventh embodiment, the lower end portion 14B of the trigger lever 14 is located above the straight line 311 connecting the lower end portion of the tip tool holder 51 and the rear end portion of the lower surface of the battery 325.

[0298] In the above configuration, when the angle fastening tool 1B is installed facing downwards on a workbench or the like, the lower end 14B of the trigger lever 14 can be prevented from coming into contact with the installation surface. Therefore, unintentional operation of the trigger lever 14 can be suppressed.

[0299] In the seventh embodiment, the angle fastening tool 1B includes a battery holder 23 connected to the rear end of the grip portion 22, which detachably holds the battery 325. With the battery 325 installed, the center of gravity CG of the angle fastening tool 1B is closer to the lower end 14B of the trigger lever 14 than to the tip tool holder 51 in the front-rear direction.

[0300] In the above configuration, the center of gravity CG of the angle fastening tool 1B during use is close to the trigger lever 14, making it easier to move the tip of the angle fastening tool 1B. Furthermore, even when fastening work is performed in various positions, such as when the angle fastening tool 1B is facing upwards (with the tip tool holder 51 facing upwards), the center of gravity CG is close to the user's hand, allowing for stable gripping and maintenance of the position.

[0301] In the seventh embodiment, the center of gravity CG of the angle fastening tool 1B is located between the front end of the motor 6 and the lower end 14B of the trigger lever 14 in the front-rear direction.

[0302] In the above configuration, the center of gravity CG of the angle fastening tool 1B can be brought sufficiently close to the trigger lever 14. Also, since the center of gravity CG is not located behind the trigger lever 14, it is easier to stabilize the position of the tip tool holder 51 during fastening work.

[0303] In the seventh embodiment, the front-to-back distance L1 between the trigger lever 14 and the motor 6 is smaller than the front-to-back distance L4 between the trigger lever 14 and the battery holder 23.

[0304] In the above configuration, the trigger lever 14 is closer to the motor 6, making it easy to bring the center of gravity CG of the trigger lever 14 and the angle fastening tool 1B closer together.

[0305] In the seventh embodiment, the angle fastening tool 1B includes a grip portion 22 extending in the front-rear direction, a motor housing portion 21 positioned in front of the grip portion 22, a motor 6 positioned inside the motor housing portion 21, a spindle 8 positioned in front of the motor 6 and extending in a direction intersecting the front-rear direction and rotated by the motor 6, a case 4 housing the spindle 8, a tip tool holder portion 51 protruding downward from the lower surface of the case 4 and rotated by the spindle 8, and a trigger lever 14 provided so as to protrude downward from the lower surface of the grip portion 22. The circumference of the narrowest part 22N of the grip portion 22 is smaller than the circumference of the narrowest part 21N of the motor housing portion 21.

[0306] In the above configuration, the circumference of the narrowest part 22N of the grip portion 22 is smaller than the circumference of the narrowest part 21N of the motor housing portion 21. This prevents the grip portion 22 from becoming too thick, making it easier to grip and improving operability when the operator grips the grip portion 22. Because the grip portion 22 is thin, the trigger lever 14 of the grip portion 22 is less likely to protrude outward from the motor housing portion 21 (or the amount of protrusion is small). Therefore, when inserting the angle fastening tool 1B into a narrow space, the trigger lever 14 or the fingers on the trigger lever 14 are less likely to come into contact with surrounding structures, reducing the possibility of unintentional operation. As a result, the operability of the angle fastening tool 1B can be improved.

[0307] In the seventh embodiment, the cross-section of the grip portion 22 perpendicular to the front-to-back direction has a width W12 in the left-to-right direction that is smaller than the width W11 in the up-to-down direction.

[0308] In the above configuration, the grip portion 22 can be made into a cross-sectional shape that is easy to grip and fits comfortably in the hand when held by hand. The improved grip of the grip portion 22 improves the operability of the angle fastening tool 1B.

[0309] In the seventh embodiment, the angle fastening tool 1B includes a battery holder 23 connected to the rear end of the grip portion 22, which detachably holds the battery 325. With the battery 325 installed, the center of gravity position CG is closer to the trigger lever 14 than to the tip tool holder 51 in the front-rear direction.

[0310] In the above configuration, the center of gravity CG of the angle fastening tool 1B during use is close to the trigger lever 14, making it easier to move the tip of the angle fastening tool 1B. Furthermore, even when fastening work is performed in various positions, such as when the angle fastening tool 1B is facing upwards (with the tip tool holder 51 facing upwards), the center of gravity CG is close to the user's hand, allowing for stable gripping and maintenance of the position.

[0311] In the seventh embodiment, the angle fastening tool 1B includes a battery holding portion 23 connected to the rear end of the grip portion 22 and detachably holding the battery 325, and an operation panel 16 exposed on the upper surface of the motor housing portion 21. The operation panel 16 is located below the straight line 312 connecting the front upper end position UF, which is the uppermost position of the motor housing portion 21 and case 4, and the rear upper end position UR, which is the uppermost position of the grip portion 22 and battery holding portion 23.

[0312] In the above configuration, when the angle fastening tool 1B is installed facing upwards (with the tip tool holder 51 facing upwards) on a workbench or the like, the operation panel 16 can be prevented from coming into contact with the installation surface. Therefore, unintentional operation of the operation panel 16 can be suppressed.

[0313] In the seventh embodiment, the angle fastening tool 1B includes a controller 18 connected to the operation panel 16 via wiring. The battery holder 23 has a dome-shaped portion 23A that bulges upward, including the rear upper end position UR. The controller 18 is located inside the dome-shaped portion 23A.

[0314] In the above configuration, by providing a dome-shaped portion 23A in the battery holding portion 23, a rear upper end position UR is formed to prevent the operation panel 16 from coming into contact with the mounting surface, while also securing space to house the controller 18 using the dome-shaped portion 23A. Even if the controller 18 is equipped with tall electronic components, the controller 18 can be housed without difficulty.

[0315] (modified version) In the above embodiment, the operation panel 16 is arranged to overlap the motor 6 vertically, but this is not limited to this configuration. Figure 42 is a longitudinal cross-sectional view showing a modified arrangement of the operation panel 16. Figure 42 shows a longitudinal cross-section of the battery holding section 23.

[0316] In the modified example shown in Figure 42, the control panel 16 is provided on the battery holder 23. The control panel 16 is exposed to the outside on the upper surface of the battery holder 23. The control panel 16 is located on the side of the battery holder 23 opposite to the grip portion 22. The control panel 16 is provided on the dome-shaped portion 23A of the battery holder 23. The control panel 16 is located on the rearward sloping surface of the upper surface of the upwardly bulging dome-shaped portion 23A. The operation buttons 16A and indicator display 16B of the control panel 16 are located inside the panel opening that penetrates the dome-shaped portion 23A. The switch board 16C is provided so as to close the panel opening.

[0317] The switch board 16C overlaps vertically with the controller 18, which is located inside the dome-shaped portion 23A. At least one of the front end 16F and the rear end 16R of the switch board 16C is positioned between the front end and the rear end of the controller 18. The switch board 16C and the controller 18 overlap vertically with the battery 325 held in the battery holding portion 23. [Explanation of Symbols]

[0318] 1…Angle fastening tool, 1A…Angle fastening tool, 1B…Angle fastening tool, 2…Housing, 2S…Screw, 4…Case, 4A…Case body, 4B…Lid, 4F…Case flange, 4H…Boss, 4S…Screw, 6…Motor, 7…Reduction mechanism, 8…Spindle, 8A…Flange, 8B…Spindle shaft, 8C…Spindle gear, 8D…Cylindrical part, 8F…Spindle groove, 9…Impact mechanism, 10…Anvil, 10A…Anvil shaft, 10B…Anvil projection, 10C…Anvil recess, 12…Fan, 13…Battery mounting part, 14…Trigger lever, 14 A...Switch body, 14B...Lower end, 15...Forward / reverse rotation lever, 16...Operation panel, 16A...Operation button, 16B...Indicator display, 16C...Switch circuit board, 16D...Bracket, 16F...Front end, 16R...Rear end, 17...Light unit, 18...Controller, 18H...Electronic component, 19...Air intake, 20...Exhaust port, 21...Motor housing section, 21A...Rear retaining section, 21B...Panel opening, 21C...Retaining groove, 21D...Lower opening, 21E...Annular rib, 21F...Housing flange section, 21G...Support wall, 21H...Screw insertion hole, 21J...Protrusion, 21N...Surface Detail, 22...Grip section, 22A...Grip, 22N...Finest detail, 23...Battery holder section, 23A...Dome-shaped section, 25...Battery, 25A...Engaging hook, 26...Stator, 27...Rotor, 28...Stator core, 29...Front insulator, 30...Rear insulator, 31...Coil, 32...Rotor core section, 33...Rotor shaft section, 34...Rotor magnet, 35...Bevel gear, 37...Sensor board, 38F...Bearing, 38R...Bearing, 41...First reduction section, 41A...Driven gear, 41B...First intermediate gear, 41C...First intermediate shaft, 41D...Intermediate bearing, 42...Second reduction Speed ​​section, 42A...Second intermediate gear, 42B...Second intermediate shaft, 42C...Intermediate bearing, 44...Spindle bearing, 45...Washer, 46...Anvil bearing, 46A...Groove, 46B...Seal member, 47...Hammer, 47A...Hammer groove, 47B...Hammer projection, 47C...Recess, 47D...Body section, 47E...Sliding surface, 48...Ball, 49...Coil spring, 50...Ball, 51...Tip tool holder section, 52...Washer, 53...Light emitter, 54...Substrate, 55...Bank, 56...Phosphor, 57...Optical component, 57A...Outer cylinder section, 57B...Inner cylinder section, 57C...Light transmitting section, 57D...Convex section,58…Molded resin, 59…Cushioning member, 60…Light cover, 60S…Screw, 61…Light emitter holder, 61A…Peripheral wall, 61B…Locking part, 61H…Boss part, 62…Cover part, 62A…Claw part, 63…Cover recess, 65…Lead wire, 65A…First lead wire, 65B…Second lead wire, 66…Connector, 66A…Connector, 66B…Connector, 67…Grounding wire, 70…Screw, 71…Inner ring, 72…Outer ring, 73…Ball, 81…Mounting surface, 81A…Screw hole, 82…Cylindrical part, 83…Guide projection, 84…Groove, 84A…Passage part, 84B…Grounding terminal, 85…Housing recess, 85A …radial support surface, 85B…front support surface, 85C…O-ring, 85D…groove, 86…outer cylinder part, 87…inner cylinder part, 88…hole part, 89…engagement hole, 91…intermediate support member, 91A…intermediate support member, 91B…intermediate support member, 91C…intermediate support member, 91D…intermediate support member, 91E…intermediate support member, 92…center opening, 93…recess, 94…rear support surface, 101…outer circumference part, 102…inner circumference part, 103…outer circumference mounting part, 104…inner circumference mounting part, 111…shaft, 112…spur gear, 113F…rotor bearing, 114…driven gear, 115A…first intermediate gear, 115B…second intermediate gear, 11 5C...Intermediate shaft, 116...Intermediate bearing, 118...Housing recess, 118A...Radial support surface, 118B...Front support surface, 119...Front housing section, 120...Rear housing section, 121...First housing chamber, 122...Second housing chamber, 135...Bevel gear, 139...Bearing, 201...Light unit, 202...Substrate, 203...Optical component, 203A...Side wall section, 203B...Light transmitting section, 203C...Protrusion section, 203D...Shoulder section, 204...Light cover, 205...Light emitter holding section, 205A...Opening, 205B...Through hole, 206...Cover section, 211...Mounting surface, 211A...Screw hole, 212...Groove section, 21 3...Light source placement section, 214...Guide wall, 214A...Guide groove, 221...First section, 222...Second section, 223...Third section, 224...First partition wall, 225...Second partition wall, 301...Pressing surface, 301A...First end, 301B...Second end, 301C...Intermediate section, 302...Rotating shaft, 303...Rotating arm, 311...Straight line, 312...Straight line, 325...Battery, 330...Range, CL...Gap, D1...Inner diameter, D2...Inner diameter, D3...Depth, D4...Thickness, FM...Fixing member, H1...Vertical distance, H2...Vertical distance, L1...Distance, L2...Distance, L3...Distance, L4...Distance, L10...Length, L11...Distance,L12…distance, W1…frame, W2…frame, W11…frame, W12…frame.

Claims

1. A grip section that extends in the front-to-back direction, A motor housing portion is positioned in front of the grip portion, A motor is disposed inside the motor housing, A spindle positioned in front of the motor, extending in a direction intersecting the front-rear direction, and rotated by the motor, A case for housing the spindle, A tip tool holder protrudes downward from the lower surface of the case and is rotated by the spindle, The grip portion includes a trigger lever that protrudes downward from the lower surface of the grip portion, In the vertical direction, the lower end of the trigger lever is positioned closer to the lower surface of the motor housing than the lower end of the tip tool holder. Angle fastening tool.

2. The trigger lever includes a pressing surface that is pressed when pulled, The pressing surface extends to the lower end of the trigger lever and is curved in a concave shape. An angle fastening tool according to claim 1.

3. The pressing surface has a first end located at the lower end of the trigger lever, a second end on the opposite side of the first end, and a concave intermediate portion that curves upward from the first and second ends. An angle fastening tool according to claim 2.

4. The grip portion has a grip located further back than the trigger lever. The aforementioned intermediate portion is located above the lower surface of the motor housing portion and below the lower surface of the grip portion. An angle fastening tool according to claim 3.

5. The grip portion is connected to the rear end and further comprises a battery holding portion that detachably holds the battery, The lower end of the trigger lever is located above the lower surface of the battery. An angle fastening tool according to claim 1.

6. The lower end of the trigger lever is located above the straight line connecting the lower end of the tip tool holder and the rear end of the lower surface of the battery. An angle fastening tool according to claim 5.

7. The grip portion is connected to the rear end and further comprises a battery holding portion that detachably holds the battery, With the battery installed, the center of gravity is closer to the lower end of the trigger lever than the tip tool holder in the front-rear direction. An angle fastening tool according to claim 1.

8. The center of gravity is located between the front end of the motor and the lower end of the trigger lever in the front-rear direction. An angle fastening tool according to claim 7.

9. The distance between the trigger lever and the motor in the front-rear direction is smaller than the distance between the trigger lever and the battery holder in the front-rear direction. An angle fastening tool according to claim 7.

10. A grip section that extends in the front-to-back direction, A motor housing portion is positioned in front of the grip portion, A motor is disposed inside the motor housing, A spindle positioned in front of the motor, extending in a direction intersecting the front-rear direction, and rotated by the motor, A case for housing the spindle, A tip tool holder protrudes downward from the lower surface of the case and is rotated by the spindle, The grip portion includes a trigger lever that protrudes downward from the lower surface of the grip portion, The circumference of the narrowest part of the grip portion is smaller than the circumference of the narrowest part of the motor housing portion. Angle fastening tool.

11. The cross-section of the grip portion perpendicular to the front-to-back direction has a width in the left-to-right direction that is smaller than the width in the up-to-down direction. An angle fastening tool according to claim 10.

12. The grip portion is connected to the rear end and further comprises a battery holding portion that detachably holds the battery, The lower end of the trigger lever is located above the straight line connecting the lower end of the tip tool holder and the rear end of the lower surface of the battery. An angle fastening tool according to claim 10.

13. The grip portion is connected to the rear end and further comprises a battery holding portion that detachably holds the battery, With the battery installed, the center of gravity is closer to the trigger lever than the tip tool holder in the front-to-back direction. An angle fastening tool according to claim 10.

14. The center of gravity is located between the front end of the motor and the lower end of the trigger lever in the front-rear direction. An angle fastening tool according to claim 13.

15. A battery holder is connected to the rear end of the grip portion and holds the battery in a removable manner, The motor housing portion further comprises an operating panel exposed on the upper surface of the motor housing portion, The control panel is located below the line connecting the uppermost front end position of the motor housing and the case, and the uppermost rear end position of the grip and the battery holder. An angle fastening tool according to claim 10.

16. The control panel further comprises a controller connected via wiring, The battery holding portion has a dome-shaped portion that bulges upward including the rear upper end position, The controller is located inside the dome-shaped portion. An angle fastening tool according to claim 15.

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