Attachment

Abstract

To suppress prolongation of work time in a construction site.SOLUTION: An attachment includes: an input shaft that is rotatable with a first rotary shaft as a center and to which power is input from an electric tool; a tip socket having a recess; a housing that has a housing opening to which a work object is inserted, and rotatably supports the tip socket; a power transmission mechanism for transmitting power input to the input shaft, to the tip socket; and a front face stop mechanism for stopping rotation of the tip socket in a state in which the socket opening of the recess and the housing opening are made coincident with each other.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to an attachment. [Background technology]

[0002] At construction sites, jigs such as floor beams or turnbuckles are used. Patent Document 1 discloses a turnbuckle tool for adjusting the length of the turnbuckle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-115663 Summary of the Invention [Problem to be solved by the invention]

[0004] Floor beams support the joists of a building. At construction sites, work is carried out to adjust the length of the floor beams. There is a demand for technology that can prevent work hours at construction sites from increasing.

[0005] The technology disclosed in this specification aims to prevent work hours at construction sites from becoming longer. [Means for solving the problem]

[0006] This specification discloses an attachment to be attached to a power tool. The attachment may include an input shaft rotatable about a first rotation axis and receiving power from the power tool, a tip socket having a recess, a housing having a housing opening into which a work object is inserted and rotatably supporting the tip socket, a power transmission mechanism that transmits the power input to the input shaft to the tip socket, and a front stop mechanism that stops rotation of the tip socket when the socket opening of the recess is aligned with the housing opening. [Effects of the Invention]

[0007] The technology disclosed in this specification prevents work hours at construction sites from becoming longer. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram schematically illustrating a method of using an attachment according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing the attachment according to the embodiment, seen from the right rear. [Figure 3] FIG. 3 is a perspective view showing the attachment according to the embodiment, seen from the front left. [Figure 4] FIG. 4 is an exploded perspective view showing the attachment according to the embodiment, seen from the right rear. [Figure 5] FIG. 5 is an exploded perspective view showing the attachment according to the embodiment, seen from the front left. [Figure 6] FIG. 6 is a cross-sectional view showing the attachment according to the embodiment. [Figure 7] FIG. 7 is a perspective view from below showing the input shaft, the tip socket, the power transmission mechanism, the power cut-off mechanism, the front stop mechanism, and the magnet according to the embodiment. [Figure 8] FIG. 8 is a perspective view from above showing the input shaft, the tip socket, the power transmission mechanism, the power cut-off mechanism, the front stop mechanism, and the magnet according to the embodiment. [Figure 9] FIG. 9 is a bottom view showing the input shaft, the tip socket, the power transmission mechanism, the power cut-off mechanism, the front stop mechanism, and the magnet according to the embodiment. [Figure 10] FIG. 10 is a front view showing the input shaft, the tip socket, the power transmission mechanism, the power cut-off mechanism, the front stop mechanism, and the magnet according to the embodiment. [Figure 11] FIG. 11 is an exploded perspective view showing a part of the input shaft and the power transmission mechanism according to the embodiment, as seen from the front right. [Figure 12] FIG. 12 is a cross-sectional view showing the operation of the attachment according to the embodiment. [Figure 13] FIG. 13 is a bottom view showing the operation of the input shaft, the tip socket, the power transmission mechanism, the power cut-off mechanism, the front stop mechanism, and the magnet. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, the attachment may include an input shaft rotatable about a first rotation axis and receiving power from the power tool; a tip socket having a recess; a housing having a housing opening into which a work object is inserted and rotatably supporting the tip socket; a power transmission mechanism that transmits the power input to the input shaft to the tip socket; and a front stop mechanism that stops the rotation of the tip socket when the socket opening of the recess is aligned with the housing opening.

[0010] In the above configuration, when the work target is a bundle body, the bundle body is inserted into the recess of the tip socket via the housing opening and the socket opening. The tip socket rotates when power is input to the input shaft. The rotation of the tip socket rotates the bundle body. The rotation of the bundle body adjusts the length of the floor beam. After the adjustment of the floor beam length is completed, the front stop mechanism is activated, stopping the rotation of the tip socket with the socket opening and the housing opening aligned. This allows the worker to immediately pull the attachment out of the bundle body. Since the attachment can be pulled out of the bundle body immediately after the work of adjusting the floor beam length is completed, the work time is prevented from being prolonged.

[0011] In one or more embodiments, the attachment may include a power cutoff mechanism that can cut off power. The front stop mechanism may stop rotation of the tip socket in a state where the socket opening of the recess and the housing opening are aligned in synchronization with the power cutoff.

[0012] In the above configuration, after the adjustment of the length of the floor beam is completed, the power cut-off mechanism and the front stop mechanism are operated in synchronization, thereby reducing the recoil torque applied to the worker from the attachment when the rotation of the tip socket is stopped.

[0013] In one or more embodiments, the power transmission mechanism may include a missing tooth gear provided on the outer peripheral surface of the tip socket, and a spur gear coupled to the missing tooth gear and having the same number of teeth as the missing tooth gear. The front stop mechanism may include a rotating member fixed to the spur gear and having a notch, and a moving member inserted into the notch in synchronization with the interruption of power.

[0014] In the above configuration, the rotation of the spur gear stops when the moving member is inserted into the notch. Because the number of teeth of the missing tooth gear and the number of teeth of the spur gear are the same, stopping the rotation of the missing tooth gear also stops the rotation of the spur gear so that the socket opening and the housing opening are aligned.

[0015] In one or more embodiments, the power transmission mechanism may include a first intermediate shaft coupled to the input shaft to rotate together with the input shaft, and a second intermediate shaft splined to the first intermediate shaft to transmit power input to the input shaft to the spur gear. The power cut-off mechanism may release the spline connection.

[0016] In the above configuration, when the spline connection is released, the power transmitted from the input shaft to the tip socket is interrupted.

[0017] In one or more embodiments, the attachment may include a bearing supported by the housing and supporting the first intermediate shaft. The input shaft and the first intermediate shaft may be movable in a forward and backward direction parallel to the first rotational axis. Forward movement of the input shaft and the first intermediate shaft may release the spline connection.

[0018] In the above configuration, when the electric power tool is pushed forward by an operator, the input shaft and the first intermediate shaft move forward, thereby releasing the spline connection.

[0019] In one or more embodiments, the moving member may move in the forward and backward directions together with the input shaft and the first intermediate shaft. Forward movement of the input shaft and the first intermediate shaft may insert the moving member into the notch.

[0020] In the above configuration, when the operator pushes the power tool forward, the input shaft and the first intermediate shaft move forward, causing the moving member to be inserted into the notch, and stopping the rotation of the partly toothed gear so that the socket opening and the housing opening are aligned.

[0021] In one or more embodiments, the power transmission mechanism may include a first intermediate gear and a second intermediate gear that mesh with the spur gear. The spur gear may be coupled to the missing tooth gear via at least one of the first intermediate gear and the second intermediate gear. When the spur gear rotates, at least one of the first intermediate gear and the second intermediate gear may mesh with the missing tooth gear.

[0022] In the above configuration, during the period when the missing tooth gear cannot mesh with the first intermediate gear as the missing tooth gear rotates, the missing tooth gear meshes with the second intermediate gear. Therefore, the rotational force of the spur gear is transmitted to the missing tooth gear via the second intermediate gear. Similarly, during the period when the missing tooth gear cannot mesh with the second intermediate gear, the missing tooth gear meshes with the first intermediate gear. Therefore, the rotational force of the spur gear is transmitted to the missing tooth gear via the first intermediate gear.

[0023] In one or more embodiments, the attachment may include a magnet disposed on an inner surface of the recess.

[0024] In the above configuration, the bundle body is attached to the inner surface of the recess. This prevents the tip socket from rotating when the central axis of the bundle body and the second rotation axis of the tip socket are misaligned. Therefore, the attachment can rotate the bundle body stably.

[0025] In one or more embodiments, the inner surface of the recess may include a first side surface and a second side surface facing the first side surface across a gap. The socket opening may be provided between one end of the first side surface and one end of the second side surface. The surface of the magnet may be disposed between the other end of the first side surface and the other end of the second side surface.

[0026] In the above configuration, the magnet is disposed on the innermost surface of the recess, so that when the bundle main body is inserted into the recess through the socket opening, the bundle main body is prevented from being attracted to at least one of the first side surface and the second side surface. Since the bundle main body is attracted to the magnet after being inserted deep into the recess, a decrease in workability when inserting the bundle main body into the tip socket is prevented.

[0027] The first side surface, the second side surface, and the rear surface may each be parallel to a second rotation axis of the tip socket. A dimension of each of the first side surface, the second side surface, and the rear surface in a direction parallel to the second rotation axis may be greater than a dimension of each of the first side surface, the second side surface, and the rear surface in a direction perpendicular to the second rotation axis.

[0028] With the above configuration, the tip socket is prevented from rotating when the central axis of the bundle main body and the second rotation axis of the tip socket are misaligned. Therefore, the attachment can rotate the bundle main body stably.

[0029] Hereinafter, embodiments will be described with reference to the drawings. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0030] In the embodiments, the positional relationship of each part is described using the terms left, right, front, rear, top, and bottom. These terms indicate relative positions or directions based on the center of the attachment.

[0031] [How to use the attachment] FIG. 1 is a diagram schematically illustrating how to use an attachment 1 according to an embodiment. The attachment 1 is attached to a power tool 100. In the example illustrated in FIG. 1, the power tool 100 is a pen-type driver drill. The power tool 100 may be any rotary power tool, such as an impact driver or a driver drill. The power tool 100 includes an output shaft 101 and a motor (not shown) that rotates the output shaft 101. The output shaft 101 has a tool hole 102 into which a driver bit is inserted. When an operator operates a trigger switch provided on the power tool 100, the motor is driven and the output shaft 101 rotates.

[0032] The attachment 1 is used to adjust the length of the floor beam 200. Examples of the floor beam 200 include resin beams made of synthetic resin and steel beams made of steel. In the embodiment, the floor beam 200 is a steel beam. In the following description, the floor beam 200 will be referred to as a steel beam 200 as appropriate.

[0033] The steel beam 200 is installed on the foundation 301 of the building. The steel beam 200 supports the joists 302 of the building from below. The steel beam 200 includes a beam body 201 extending in the vertical direction, a lower threaded rod 202 attached to the lower part of the beam body 201, an upper threaded rod 203 attached to the upper part of the beam body 201, a base plate 204 fixed to the lower threaded rod 202, and a support plate 205 fixed to the upper threaded rod 203.

[0034] The bundle main body 201 is pipe-shaped. The middle part of the bundle main body 201 in the vertical direction is rectangular tubular. That is, the outer shape of the middle part of the bundle main body 201 in the vertical direction is square. A lower screw hole is provided in the lower part of the bundle main body 201. An upper screw hole is provided in the upper part of the bundle main body 201. The lower screw hole and the upper screw hole have a mutually reverse-threaded relationship.

[0035] The lower screw rod 202 is inserted into the lower screw hole of the bundle body 201 from the underside of the bundle body 201. The lower screw rod 202 is coupled to the lower screw hole. The upper screw rod 203 is inserted into the upper screw hole of the bundle body 201 from the top side of the bundle body 201. The upper screw rod 203 is coupled to the upper screw hole.

[0036] The base plate 204 is fixed to the lower end of the lower threaded rod 202. The base plate 204 is installed on the foundation part 301. The support plate 205 is fixed to the upper end of the upper threaded rod 203. The support plate 205 supports the joists 302.

[0037] Rotating the bundle body 201 changes the insertion amount of the lower screw rod 202 into the lower screw hole and the insertion amount of the upper screw rod 203 into the upper screw hole. Changing the insertion amount of the lower screw rod 202 into the lower screw hole and the insertion amount of the upper screw rod 203 into the upper screw hole changes the distance between the base plate 204 and the support plate 205. This adjusts the length of the steel bundle 200 and the height of the support plate 205 relative to the base plate 204.

[0038] A lower lock nut 206 is disposed around the lower threaded rod 202. An upper lock nut 207 is disposed around the upper threaded rod 203. After the length of the steel bundle 200 has been adjusted, the lower lock nut 206 is rotated relative to the lower threaded rod 202 so that it contacts the bundle body 201, and the upper lock nut 207 is rotated relative to the upper threaded rod 203 so that it contacts the bundle body 201. This suppresses relative rotation between the bundle body 201 and the lower threaded rod 202, and also suppresses relative rotation between the bundle body 201 and the upper threaded rod 203.

[0039] The attachment 1 includes an input shaft 3 inserted into a tool hole 102 of the power tool 100 and a tip socket 4 arranged around the bundle body 201. The input shaft 3 rotates around a rotation axis AX (first rotation axis). The tip socket 4 rotates around a rotation axis CX (second rotation axis). An axis parallel to the rotation axis AX is perpendicular to the rotation axis CX. With the input shaft 3 inserted into the tool hole 102 and the tip socket 4 arranged around the bundle body 201, an operator operates a trigger switch provided on the power tool 100 to drive the motor and rotate the output shaft 101. The rotation of the output shaft 101 inputs power from the power tool 100 to the input shaft 3. The rotation of the output shaft 101 causes the input shaft 3 to rotate around the rotation axis AX. The rotation of the input shaft 3 causes the tip socket 4 to rotate around the rotation axis CX. The rotation of the tip socket 4 causes the bundle body 201 to rotate. The length of the steel bundle 200 is adjusted by rotating the bundle body 201.

[0040] [attachment] Fig. 2 is a perspective view of the attachment 1 according to the embodiment, seen from the right rear. Fig. 3 is a perspective view of the attachment 1 according to the embodiment, seen from the left front. Fig. 4 is an exploded perspective view of the attachment 1 according to the embodiment, seen from the right rear. Fig. 5 is an exploded perspective view of the attachment 1 according to the embodiment, seen from the left front. Fig. 6 is a cross-sectional view of the attachment 1 according to the embodiment.

[0041] The attachment 1 includes a housing 2 , an input shaft 3 , a tip socket 4 , a power transmission mechanism 5 , a power interruption mechanism 6 , a front stop mechanism 7 , and a magnet 8 .

[0042] The housing 2 accommodates a power transmission mechanism 5, a power interruption mechanism 6, and a front stop mechanism 7. The housing 2 has a housing opening 2M into which the bundle main body 201, which is the object of work, is inserted. The housing 2 includes a lower housing 2A, an upper housing 2B, and a rear housing 2C.

[0043] The input shaft 3 is disposed rearward of the rear housing 2C. The input shaft 3 is disposed to extend in the front-rear direction. When inserted into the tool hole 102 of the power tool 100, the input shaft 3 is rotatable about a rotation axis AX. The rotation axis AX extends in the front-rear direction.

[0044] The tip socket 4 is arranged at the front end of the housing 2. The tip socket 4 has a socket opening 4M into which the bundle main body 201 is inserted. The tip socket 4 has a recess 4R into which the bundle main body 201 is arranged. The socket opening 4M is provided at the front end of the recess 4R. While arranged around the bundle main body 201, it rotates around the rotation axis CX. The rotation axis CX extends in the vertical direction.

[0045] FIG. 7 is a perspective view from below showing the input shaft 3, tip socket 4, power transmission mechanism 5, power cut-off mechanism 6, front stop mechanism 7, and magnet 8 according to the embodiment. FIG. 8 is a perspective view from above showing the input shaft 3, tip socket 4, power transmission mechanism 5, power cut-off mechanism 6, front stop mechanism 7, and magnet 8 according to the embodiment. FIG. 9 is a bottom view showing the input shaft 3, tip socket 4, power transmission mechanism 5, power cut-off mechanism 6, front stop mechanism 7, and magnet 8 according to the embodiment. FIG. 10 is a front view showing the input shaft 3, tip socket 4, power transmission mechanism 5, power cut-off mechanism 6, front stop mechanism 7, and magnet 8 according to the embodiment. FIG. 11 is an exploded perspective view from the right front showing a portion of the input shaft 3 and power transmission mechanism 5 according to the embodiment.

[0046] The power transmission mechanism 5 transmits the power input from the power tool 100 to the input shaft 3 to the tip socket 4. The power transmission mechanism 5 transmits the rotational force of the input shaft 3 to the tip socket 4. The power transmission mechanism 5 has a first intermediate shaft 9, a second intermediate shaft 10, a first bevel gear 11, a second bevel gear 12, a third intermediate shaft 24, a spur gear 13, a first intermediate gear 14, a second intermediate gear 15, and a missing tooth gear 16.

[0047] The first intermediate shaft 9 is connected to the input shaft 3. The first intermediate shaft 9 rotates together with the input shaft 3 about the rotation axis AX. The first intermediate shaft 9 and the input shaft 3 are connected by two balls 17 and a leaf spring 18. The balls 17 are disposed in a groove 3A provided in the front part of the input shaft 3. The leaf spring 18 is disposed so as to cover the balls 17. The leaf spring 18 has an opening 18A in which a portion of the balls 17 is disposed.

[0048] The first intermediate shaft 9 is rotatably supported by a bearing 19. The bearing 19 is a plain bearing. The bearing 19 is held by a cylindrical portion 2D of the rear housing 2C. The input shaft 3 is supported by the housing 2 via the first intermediate shaft 9 and the bearing 19, which is a plain bearing. The rear housing 2C has a support portion 2E that contacts the rear end of the bearing 19 and a support portion 2F that contacts the front end of the bearing 19. The support portions 2E and 2F prevent the bearing 19 from moving in the front-rear direction relative to the housing 2. The first intermediate shaft 9 is rotatably supported by the bearing 19 around the rotation axis AX, and is movable in the front-rear direction relative to the bearing 19. The input shaft 3 and the first intermediate shaft 9 are supported by the housing 2 via the bearing 19 so as to be movable in the front-rear direction parallel to the rotation axis AX.

[0049] The second intermediate shaft 10 is connected to the first intermediate shaft 9. The second intermediate shaft 10 transmits power input from the power tool 100 to the input shaft 3 to the spur gear 13. The second intermediate shaft 10 is splined to the first intermediate shaft 9. The first intermediate shaft 9 has a spline hole 9A into which the rear portion of the second intermediate shaft 10 is inserted. Internal spline teeth 9G are formed on the inner surface of the spline hole 9A. External spline teeth 10G are formed on the rear portion of the second intermediate shaft 10. The internal spline teeth 9G and the external spline teeth 10G mesh with each other. With the internal spline teeth 9G and the external spline teeth 10G meshed with each other, the second intermediate shaft 10 rotates together with the first intermediate shaft 9 about the rotation axis AX.

[0050] The second intermediate shaft 10 is rotatably supported by bearings 20. The bearings 20 are ball bearings. Two bearings 20 are arranged. The two bearings 20 are arranged in the front-to-rear direction. The rear end surface of the outer ring of the rear bearing 20 is supported by a support portion 2G provided on the lower housing 2A via a snap ring 21. The front end surface of the outer ring of the front bearing 20 is supported by a support portion 2H provided on the lower housing 2A. The front end surface of the inner ring of the front bearing 20 is supported by a snap ring 22. The snap ring 22 is arranged in a groove 10A provided in the front part of the second intermediate shaft 10. The support portions 2G and 2H prevent the bearings 20 from moving in the front-to-rear direction relative to the housing 2.

[0051] The second intermediate shaft 10 has a flange portion 10B that contacts the rear end surface of the inner ring of the rear bearing 20. The flange portion 10B and the snap ring 22 prevent the second intermediate shaft 10 from moving in the front-rear direction relative to the bearing 20.

[0052] As described above, the first intermediate shaft 9 is movable in the front-rear direction relative to the bearing 19. From a state in which the internal spline teeth 9G and the external spline teeth 10G are engaged with each other, the first intermediate shaft 9 can move forward relative to the bearing 19. When the first intermediate shaft 9 moves forward, the internal spline teeth 9G move away from the external spline teeth 10G. In other words, when the first intermediate shaft 9 moves forward, the spline connection between the internal spline teeth 9G and the external spline teeth 10G is released.

[0053] A coil spring 23 is disposed in the internal space 9B of the first intermediate shaft 9. The rear end of the coil spring 23 contacts a support surface 9C provided in the internal space 9B of the first intermediate shaft 9. The front end of the coil spring 23 contacts a support surface 10C provided on the second intermediate shaft 10. The coil spring 23 is disposed between the support surfaces 9C and 10C in a compressed state. The coil spring 23 generates an elastic force that moves the first intermediate shaft 9 rearward.

[0054] The first bevel gear 11 is fixed to the front end of the second intermediate shaft 10. The first bevel gear 11 rotates together with the second intermediate shaft 10 about the rotation axis AX.

[0055] The second bevel gear 12 meshes with the first bevel gear 11. The second bevel gear 12 rotates about a rotation axis BX. The rotation axis BX extends in the vertical direction. The second bevel gear 12 is fixed to a third intermediate shaft 24. The third intermediate shaft 24 extends in the vertical direction. The third intermediate shaft 24 rotates together with the second bevel gear 12 about the rotation axis BX. A lower end of the third intermediate shaft 24 is rotatably supported by a bearing 25. An upper end of the third intermediate shaft 24 is rotatably supported by a bearing 26. The bearing 25 is held by the lower housing 2A. The bearing 26 is held by the upper housing 2B. When the first bevel gear 11 rotates, the second bevel gear 12 rotates. When the second bevel gear 12 rotates, the third intermediate shaft 24 rotates together with the second bevel gear 12.

[0056] The spur gear 13 is fixed to the third intermediate shaft 24. The spur gear 13 is disposed below the second bevel gear 12. The spur gear 13 rotates about the rotation axis BX. When the second bevel gear 12 rotates and the third intermediate shaft 24 rotates, the spur gear 13 rotates together with the third intermediate shaft 24.

[0057] The first intermediate gear 14 and the second intermediate gear 15 each mesh with the spur gear 13. The first intermediate gear 14 is disposed to the right of the second intermediate gear 15. The first intermediate gear 14 and the second intermediate gear 15 each rotate about a rotation axis extending in the vertical direction. A shaft 14A is fixed to the first intermediate gear 14. A shaft 15A is fixed to the second intermediate gear 15. The lower end of the shaft 14A is rotatably supported by a bearing 27, and the upper end of the shaft 14A is rotatably supported by a bearing 28. The lower end of the shaft 15A is rotatably supported by a bearing 29, and the upper end of the shaft 15A is rotatably supported by a bearing 30. The bearings 27 and 29 are each held by the lower housing 2A. The bearings 28 and 30 are each held by the upper housing 2B.

[0058] As the spur gear 13 rotates, the first intermediate gear 14 and the second intermediate gear 15 meshing with the spur gear 13 also rotate.

[0059] The partially toothed gear 16 is provided on the outer peripheral surface of the tip socket 4. The partially toothed gear 16 is fixed to the tip socket 4. The partially toothed gear 16 and the tip socket 4 may be integral. The partially toothed gear 16 meshes with at least one of the first intermediate gear 14 and the second intermediate gear 15. The spur gear 13 is coupled to the partially toothed gear 16 via at least one of the first intermediate gear 14 and the second intermediate gear 15. The partially toothed gear 16 has a gear opening 16M into which the bundle main body 201 is inserted. The socket opening 4M and the gear opening 16M coincide in the circumferential direction of the rotation axis CX.

[0060] The rotation of the first intermediate gear 14 and the second intermediate gear 15 causes the missing tooth gear 16 to rotate about the rotation axis CX. As the missing tooth gear 16 rotates, the tip socket 4 fixed to the missing tooth gear 16 rotates together with the missing tooth gear 16 about the rotation axis CX.

[0061] The missing tooth gear 16 has a gear opening 16M. Therefore, during the rotation of the missing tooth gear 16, there is a period during which the missing tooth gear 16 and the first intermediate gear 14 cannot mesh together. During the period during which the missing tooth gear 16 and the first intermediate gear 14 cannot mesh together, the missing tooth gear 16 meshes with the second intermediate gear 15. Therefore, the rotational force of the spur gear 13 is transmitted to the missing tooth gear 16 via the second intermediate gear 15. Similarly, during the rotation of the missing tooth gear 16, there is a period during which the missing tooth gear 16 and the second intermediate gear 15 cannot mesh together. During the period during which the missing tooth gear 16 and the second intermediate gear 15 cannot mesh together, the missing tooth gear 16 meshes with the first intermediate gear 14. Therefore, the rotational force of the spur gear 13 is transmitted to the missing tooth gear 16 via the first intermediate gear 14. When the spur gear 13 rotates, at least one of the first intermediate gear 14 and the second intermediate gear 15 meshes with the missing tooth gear 16 , so that the rotational force of the spur gear 13 is transmitted to the missing tooth gear 16 .

[0062] The tip socket 4 is rotatably supported by bearings 31 and 32. The bearing 31 rotatably supports the lower part of the tip socket 4. The bearing 32 rotatably supports the upper part of the tip socket 4. The bearing 31 is held by the lower housing 2A. The bearing 32 is held by the upper housing 2B. The tip socket 4 is rotatably supported by the housing 2 via the bearings 31 and 32.

[0063] A portion of the bearing 31 is cut out. The bearing 31 has a bearing opening 31M into which the bundle main body 201 is inserted. A portion of the bearing 32 is cut out. The bearing 32 has a bearing opening 32M into which the bundle main body 201 is inserted.

[0064] The power interrupting mechanism 6 can interrupt power transmitted from the input shaft 3 to the tip socket 4. The power interrupting mechanism 6 includes internal spline teeth 9G and external spline teeth 10G. The power interrupting mechanism 6 interrupts power transmitted from the input shaft 3 to the tip socket 4 by disengaging the splined connection between the first intermediate shaft 9 and the second intermediate shaft 10. When the input shaft 3 and the first intermediate shaft 9 are rotated by the power tool 100 with the internal spline teeth 9G and the external spline teeth 10G meshed, the second intermediate shaft 10 rotates together with the first intermediate shaft 9. As a result, the rotational force input to the input shaft 3 is transmitted to the tip socket 4 via the power transmission mechanism 5. With the input shaft 3 inserted into the tool hole 102 and the tip socket 4 positioned around the bundle body 201, the operator can move the power tool 100 forward so as to press the power tool 100 against the attachment 1. As described above, the first intermediate shaft 9 is movable forward and backward relative to the bearing 19. When the power tool 100 moves forward so as to be pressed against the attachment 1, the input shaft 3 and the first intermediate shaft 9 move forward relative to the bearing 19. When the first intermediate shaft 9 moves forward relative to the bearing 19 from a state in which the internal spline teeth 9G and the external spline teeth 10G are engaged, the internal spline teeth 9G move forward of the external spline teeth 10G, and the spline connection between the internal spline teeth 9G and the external spline teeth 10G is released. In other words, the forward movement of the input shaft 3 and the first intermediate shaft 9 releases the spline connection between the first intermediate shaft 9 and the second intermediate shaft 10. As a result, even if the input shaft 3 and the first intermediate shaft 9 are rotated by the power tool 100, the second intermediate shaft 10 does not rotate. Therefore, the rotational force input to the input shaft 3 is blocked from being transmitted to the tip socket 4.

[0065] The front stop mechanism 7 stops the rotation of the tip socket 4 when the socket opening 4M of the recessed portion 4R is aligned with the housing opening 2M. The front stop mechanism 7 adjusts the position of the tip socket 4 in the circumferential direction about the rotation axis CX so that the socket opening 4M of the recessed portion 4R is aligned with the housing opening 2M.

[0066] The front stop mechanism 7 stops the rotation of the tip socket 4 in a state where the socket opening 4M of the recessed portion 4R and the housing opening 2M are aligned in synchronization with the interruption of power by the power interrupting mechanism 6. The front stop mechanism 7 adjusts the position of the tip socket 4 in the circumferential direction about the rotation axis CX so that the socket opening 4M of the recessed portion 4R and the housing opening 2M are aligned when the power transmission is interrupted by the power interrupting mechanism 6.

[0067] The front stop mechanism 7 has a rotating member 33 fixed to the spur gear 13 and a moving member 34 that moves in the front-rear direction together with the input shaft 3 and the first intermediate shaft 9.

[0068] The rotating member 33 is a substantially disk-shaped member. The rotating member 33 is disposed below the spur gear 13. The rotating member 33 is also fixed to the third intermediate shaft 24. The rotating member 33 and the spur gear 13 may be integral (a single member). The rotating member 33 rotates together with the third intermediate shaft 24 and the spur gear 13 about the rotation axis CX.

[0069] Rotating member 33 has an outer circumferential surface 331 and a notch 332 provided in a part of outer circumferential surface 331. Notch 332 is formed so as to be recessed from a part of outer circumferential surface 331 toward the center of rotating member 33 (rotation axis CX).

[0070] The inner surface of the cutout portion 332 includes a first side surface 332A, a second side surface 332B opposite the first side surface 332A, an abutment surface 332C arranged to connect the inner end of the first side surface 332A and the inner end of the second side surface 332B, a first tapered surface 332D arranged to connect the outer end of the first side surface 332A and the outer peripheral surface 331, and a second tapered surface 332E arranged to connect the outer end of the second side surface 332B and the outer peripheral surface 331.

[0071] The moving member 34 is a rod-shaped member that is long in the front-rear direction. The front end of the moving member 34 is disposed forward of the front end of the first intermediate shaft 9. The moving member 34 is connected to the first intermediate shaft 9 via a connecting member 35. In this embodiment, the connecting member 35 is a plate-shaped member. The moving member 34 and the connecting member 35 are fixed together with a screw 36. An arc portion 35A is provided at the upper end of the connecting member 35. The arc portion 35A is recessed downward from the upper end of the connecting member 35. The arc portion 35A is inserted into a groove 9D provided at the front part of the outer circumferential surface of the first intermediate shaft 9.

[0072] The relative position between the first intermediate shaft 9 and the moving member 34 does not change. The moving member 34 moves in the front-to-rear direction together with the input shaft 3 and the first intermediate shaft 9. When the input shaft 3 and the first intermediate shaft 9 move forward, the moving member 34 moves forward together with the input shaft 3 and the first intermediate shaft 9. When the input shaft 3 and the first intermediate shaft 9 move rearward, the moving member 34 moves rearward together with the input shaft 3 and the first intermediate shaft 9. The lower housing 2A has a guide hole 2K in which the moving member 34 is disposed. The moving member 34 moves in the front-to-rear direction while being guided by the guide hole 2K.

[0073] As the input shaft 3 and the first intermediate shaft 9 move forward, the front end of the moving member 34 is inserted into the notch 332 of the rotating member 33. In synchronization with the power cut-off mechanism 6 cutting off the power, the front end of the moving member 34 is inserted into the notch 332 of the rotating member 33.

[0074] As described above, with the input shaft 3 inserted into the tool hole 102 and the tip socket 4 disposed around the bundle body 201, the operator can move the power tool 100 forward so as to press the power tool 100 against the attachment 1. During the rotation of the rotating member 33, there are periods when the front end of the moving member 34 faces the outer circumferential surface 331 of the rotating member 33 and periods when the front end of the moving member 34 faces the notched portion 332 of the rotating member 33. During the periods when the front end of the moving member 34 faces the outer circumferential surface 331 of the rotating member 33, even if the operator attempts to move the first intermediate shaft 9 forward, the front end of the moving member 34 comes into contact with the outer circumferential surface 331 of the rotating member 33, preventing the first intermediate shaft 9 from moving forward. During the period when the front end of the moving member 34 faces the notch 332 of the rotating member 33, if an attempt is made to move the first intermediate shaft 9 forward, the front end of the moving member 34 is inserted into the notch 332, and the first intermediate shaft 9 can move forward.

[0075] As described above, when the first intermediate shaft 9 moves forward, the spline connection is released and power transmission from the first intermediate shaft 9 to the second intermediate shaft 10 is interrupted. Furthermore, when the front end of the moving member 34 is inserted into the notch 332, the rotation of the rotating member 33 is blocked by the moving member 34, and therefore the rotation of the spur gear 13, the first intermediate gear 14, the second intermediate gear 15, and the missing tooth gear 16 is blocked. Preventing the rotation of the missing tooth gear 16 stops the rotation of the tip socket 4. In this way, in synchronization with the power interruption by the power interruption mechanism 6, the front end of the moving member 34 is inserted into the notch 332 of the rotating member 33, and the rotation of the tip socket 4 is stopped with the socket opening 4M and the housing opening 2M aligned.

[0076] In this embodiment, the number of teeth of the spur gear 13 and the number of teeth of the missing tooth gear 16 are the same. The number of teeth of the missing tooth gear 16 refers to the number of teeth when it is assumed that the gear opening 16M does not exist. In other words, the rotation ratio of the spur gear 13 and the rotation ratio of the missing tooth gear 16 are the same. Furthermore, the initial positions of the rotational directions of the rotating member 33 and the tip socket 4 are adjusted in advance so that when the front end of the moving member 34 is inserted into the cutout portion 332 and the tip socket 4 stops rotating, the housing opening 2M and the socket opening 4M of the tip socket 4 are aligned. As a result, the housing opening 2M and the socket opening 4M of the tip socket 4 are aligned simply by the operator pushing the power tool 100 in.

[0077] The magnet 8 is provided in the tip socket 4. The magnet 8 is disposed on the inner surface of a recess 4R of the tip socket 4. The inner surface of the recess 4R of the tip socket 4 includes a first side surface 4A, a second side surface 4B facing the first side surface 4A across a gap, and a rear surface 4C connecting the rear end of the first side surface 4A and the rear end of the second side surface 4B. A socket opening 4M is provided between the front end of the first side surface 4A and the front end of the second side surface 4B.

[0078] The magnet 8 is plate-shaped. The outer shape of the magnet 8 is substantially rectangular parallelepiped. The front surface (surface) of the magnet 8 is disposed between the rear end of the first side surface 4A and the rear end of the second side surface 4B. The magnet 8 is disposed on the rear surface 4C. In the embodiment, the magnet 8 is disposed in a recess 4D provided in the rear surface 4C. The rear surface 4C and the front surface of the magnet 8 disposed in the recess 4D are disposed substantially in the same plane (are flush).

[0079] By providing the magnet 8 inside the tip socket 4, when the bundle main body 201 is inserted inside the tip socket 4, the bundle main body 201 is attracted to the tip socket 4 by the magnetic force of the magnet 8. This reduces rattle between the tip socket 4 and the bundle main body 201. The magnet 8 can, for example, align the rotation axis AX of the tip socket 4 with the central axis of the bundle main body 201. The attachment 1 can rotate the bundle main body 201 while eccentricity between the tip socket 4 and the bundle main body 201 is reduced.

[0080] The magnet 8 is disposed on the rear surface 4C. That is, the magnet 8 is disposed at a position far from the socket opening 4M. As a result, when the bundle main body 201 is inserted into the tip socket 4 through the socket opening 4M, the attractive force of the magnet 8 is exerted after the bundle main body 201 is inserted all the way into the tip socket 4. For example, if the magnet 8 is disposed near the socket opening 4M, the bundle main body 201 may be attracted to the magnet 8 before the bundle main body 201 is inserted all the way into the tip socket 4, which may make it difficult to smoothly insert the bundle main body 201 all the way into the tip socket 4. In the embodiment, the magnet 8 is disposed at a position far from the socket opening 4M, so that the bundle main body 201 is attracted to the tip socket 4 by the magnet 8 after it is inserted all the way into the tip socket 4.

[0081] The first side surface 4A, the second side surface 4B, and the rear surface 4C are each parallel to the rotation axis CX. The outer shape of the first side surface 4A is substantially rectangular. The outer shape of the second side surface 4B is substantially rectangular. The outer shape of the rear surface 4C is substantially rectangular. The dimension of the first side surface 4A in the up-down direction parallel to the rotation axis CX is larger than the dimension of the first side surface 4A in the front-to-rear direction perpendicular to the rotation axis CX. The dimension of the second side surface 4B in the up-down direction parallel to the rotation axis CX is larger than the dimension of the second side surface 4B in the front-to-rear direction perpendicular to the rotation axis CX. The dimension of the rear surface 4C in the up-down direction parallel to the rotation axis CX is larger than the dimension of the rear surface 4C in the left-to-right direction perpendicular to the rotation axis CX. In other words, the outer shape of the first side surface 4A is a rectangle that is longer in the up-down direction. The outer shape of the second side surface 4B is a rectangle that is longer in the up-down direction. The outer shape of the rear surface 4C is a rectangle that is longer in the up-down direction. Because the inner surface of the recess 4R is long in the vertical direction, rattle between the tip socket 4 and the bundle main body 201 when the bundle main body 201 is held in the tip socket 4 is suppressed. The rotation axis AX of the tip socket 4 can be aligned with the central axis of the bundle main body 201. The attachment 1 can rotate the bundle main body 201 while eccentricity between the tip socket 4 and the bundle main body 201 is suppressed.

[0082] Fig. 12 is a cross-sectional view showing the operation of the attachment 1 according to the embodiment. Fig. 13 is a bottom view showing the operation of the input shaft 3, the tip socket 4, the power transmission mechanism 5, the power interruption mechanism 6, the front stop mechanism 7, and the magnet 8 according to the embodiment.

[0083] With the input shaft 3 and the first intermediate shaft 9 pulled backward, the operator inserts the input shaft 3 into the tool hole 102 of the power tool 100 and arranges the tip socket 4 around the bundle body 201. With the input shaft 3 inserted into the tool hole 102 of the power tool 100 and the tip socket 4 arranged around the bundle body 201, the operator operates the trigger switch of the power tool 100. This causes the output shaft 101 of the power tool 100 to rotate. The rotation of the output shaft 101 causes the input shaft 3 and the first intermediate shaft 9 to rotate.

[0084] During power transmission when the input shaft 3 and the first intermediate shaft 9 are pulled rearward, the internal spline teeth 9G of the first intermediate shaft 9 mesh with the external spline teeth 10G of the second intermediate shaft 10. As a result, the rotation of the first intermediate shaft 9 is transmitted to the second intermediate shaft 10. When the rotation of the first intermediate shaft 9 is transmitted to the second intermediate shaft 10, the power of the power tool 100 input to the input shaft 3 is transmitted to the tip socket 4 via the power transmission mechanism 5. During power transmission, the moving member 34 is separated from the rotating member 33, so the rotation of the rotating member 33 is not impeded. When the tip socket 4 rotates, the bundle main body 201 rotates. When the bundle main body 201 rotates, the length of the steel bundle 200 is adjusted.

[0085] The bundle main body 201 can rotate smoothly with less rattle from the tip socket 4 due to the attraction force of the magnet 8. The tip socket 4 can rotate stably.

[0086] After adjusting the length of the steel bundle 200, the operator pushes the power tool 100 forward to stop the rotation of the tip socket 4, thereby moving the input shaft 3 and the first intermediate shaft 9 forward. When the input shaft 3 and the first intermediate shaft 9 are switched to moving forward, the internal spline teeth 9G move forward relative to the external spline teeth 10G. In addition, the front end of the moving member 34 approaches the rotating member 33. During the rotation of the rotating member 33, while the front end of the moving member 34 faces the outer peripheral surface 331 of the rotating member 33, the front end of the moving member 34 abuts against the outer peripheral surface 331 of the rotating member 33, preventing the moving member 34 from moving forward. By preventing the moving member 34 from moving forward, the input shaft 3 and the first intermediate shaft 9 are also prevented from moving forward.

[0087] While the operator continues to push the power tool 100 forward, the rotation of the rotating member 33 causes the front end of the moving member 34 to face the notch 332 of the rotating member 33, allowing the moving member 34 to move forward. When the moving member 34 is allowed to move forward and the input shaft 3 and the first intermediate shaft 9 move forward, the internal spline teeth 9G are positioned forward of the external spline teeth 10G, and the spline connection between the internal spline teeth 9G and the external spline teeth 10G is released. When the spline connection between the internal spline teeth 9G and the external spline teeth 10G is released and the power is cut off, the power of the power tool 100 is not transmitted to the tip socket 4 even if the input shaft 3 and the first intermediate shaft 9 continue to rotate by the power tool 100. In addition, the front end of the moving member 34 is inserted into the notch 332 in synchronization with the release of the spline connection between the internal spline teeth 9G and the external spline teeth 10G. This stops the rotation of the rotating member 33. Stopping the rotation of the rotating member 33 also stops the rotation of the tip socket 4. The rotation of the tip socket 4 stops when the housing opening 2M and the socket opening 4M are aligned. Because the rotation of the tip socket 4 stops when the housing opening 2M and the socket opening 4M are aligned, the worker can immediately pull out the attachment 1 from the bundle main body 201.

[0088] [effect] As described above, in the embodiment, the attachment 1 is rotatable around the rotation axis AX, which is the first rotation axis, and comprises an input shaft 3 to which power is input from the power tool 100, a tip socket 4 having a recess 4R, a housing 2 having a housing opening 2M into which the bundle main body 201, which is the work object, is inserted and rotatably supporting the tip socket 4, a power transmission mechanism 5 that transmits the power input to the input shaft 3 to the tip socket 4, and a front stop mechanism 7 that stops the rotation of the tip socket 4 when the socket opening 4M of the recess 4R is aligned with the housing opening 2M.

[0089] In the above configuration, the bundle body 201 is inserted into the recess 4R of the tip socket 4 via the housing opening 2M and the socket opening 4M. When power is input to the input shaft 3, the tip socket 4 rotates. The rotation of the tip socket 4 rotates the bundle body 201. The rotation of the bundle body 201 adjusts the length of the steel bundle 200. After the adjustment of the length of the steel bundle 200 is completed, the front stop mechanism 7 is activated, and the rotation of the tip socket 4 stops with the socket opening 4M and the housing opening 2M aligned. This allows the worker to immediately pull out the attachment 1 from the bundle body 201. Since the attachment 1 can be pulled out from the bundle body 201 immediately after the work of adjusting the length of the steel bundle 200 is completed, the work time is prevented from being prolonged.

[0090] In this embodiment, the attachment 1 includes a power cutoff mechanism 6 that can cut off power. In synchronization with the cutoff of power, the front stop mechanism 7 stops the rotation of the tip socket 4 while aligning the socket opening 4M of the recess 4R with the housing opening 2M.

[0091] In the above configuration, after the adjustment of the length of the steel bundle 200 is completed, the power cut-off mechanism 6 and the front stop mechanism 7 are operated in synchronization, thereby reducing the reaction torque applied to the worker from the attachment 1 when the rotation of the tip socket 4 is stopped.

[0092] In this embodiment, the power transmission mechanism 5 has a partly tooth-missing gear 16 provided on the outer peripheral surface of the tip socket 4, and a spur gear 13 coupled to the partly tooth-missing gear 16 and having the same number of teeth as the partly tooth-missing gear 16. The front stop mechanism 7 has a rotating member 33 fixed to the spur gear 13 and having a notch 332, and a moving member 34 inserted into the notch 332 in synchronization with the interruption of power.

[0093] In the above configuration, the rotation of the spur gear 13 stops when the moving member 34 is inserted into the notch 332. Because the number of teeth of the partly toothed gear 16 is the same as the number of teeth of the spur gear 13, stopping the rotation of the partly toothed gear 16 stops so that the socket opening 4M and the housing opening 2M are aligned.

[0094] In this embodiment, the power transmission mechanism 5 includes a first intermediate shaft 9 that is connected to the input shaft 3 and rotates together with the input shaft 3, and a second intermediate shaft 10 that is spline-coupled to the first intermediate shaft 9 and transmits the power input to the input shaft 3 to a spur gear 13. The power cut-off mechanism 6 releases the spline coupling.

[0095] In the above configuration, when the spline connection is released, the power transmitted from the input shaft 3 to the tip socket 4 is cut off.

[0096] In this embodiment, the attachment 1 is supported by the housing 2 and includes a bearing 19, which is a plain bearing, that supports the first intermediate shaft 9. The input shaft 3 and the first intermediate shaft 9 are movable in the front-rear direction parallel to the rotation axis AX. The forward movement of the input shaft 3 and the first intermediate shaft 9 releases the spline connection.

[0097] In the above configuration, when the power tool 100 is pushed forward by an operator, the input shaft 3 and the first intermediate shaft 9 move forward, thereby releasing the spline connection.

[0098] In the embodiment, the moving member 34 moves in the front-to-rear direction together with the input shaft 3 and the first intermediate shaft 9. When the input shaft 3 and the first intermediate shaft 9 move forward, the moving member 34 is inserted into the notch 332.

[0099] In the above configuration, when the operator pushes the power tool 100 forward, the input shaft 3 and the first intermediate shaft 9 move forward. As a result, the moving member 34 is inserted into the notch 332, and the rotation of the partly toothed gear 16 stops so that the socket opening 4M and the housing opening 2M are aligned.

[0100] In this embodiment, the power transmission mechanism 5 has a first intermediate gear 14 and a second intermediate gear 15 that mesh with the spur gear 13. The spur gear 13 is coupled to a missing tooth gear 16 via at least one of the first intermediate gear 14 and the second intermediate gear 15. When the spur gear 13 rotates, at least one of the first intermediate gear 14 and the second intermediate gear 15 meshes with the missing tooth gear 16.

[0101] In the above configuration, during the period when the missing tooth gear 16 cannot mesh with the first intermediate gear 14 as the missing tooth gear 16 rotates, the missing tooth gear 16 meshes with the second intermediate gear 15. Therefore, the rotational force of the spur gear 13 is transmitted to the missing tooth gear 16 via the second intermediate gear 15. Similarly, during the period when the missing tooth gear 16 cannot mesh with the second intermediate gear 15, the missing tooth gear 16 meshes with the first intermediate gear 14. Therefore, the rotational force of the spur gear 13 is transmitted to the missing tooth gear 16 via the first intermediate gear 14.

[0102] In the embodiment, the attachment 1 includes a magnet 8 disposed on the inner surface of the recess 4R.

[0103] In the above configuration, the bundle main body 201 is attracted to the inner surface of the recess 4R. This prevents the tip socket 4 from rotating in a state where the central axis of the bundle main body 201 is misaligned with the rotation axis CX, which is the second rotation axis of the tip socket 4. Therefore, the attachment 1 can rotate the bundle main body 201 stably.

[0104] In this embodiment, the inner surface of the recess 4R includes a first side surface 4A and a second side surface 4B facing the first side surface 4A with a gap therebetween. The socket opening 4M is provided between a front end portion, which is one end of the first side surface 4A, and a front end portion, which is one end of the second side surface 4B. The front surface, which is the surface of the magnet 8, is located between the other end of the first side surface 4A and the other end of the second side surface 4B.

[0105] In the above configuration, the magnet 8 is disposed on the back surface 4C of the recess 4R, so when the bundle main body 201 is inserted into the recess 4R through the socket opening 4M, the bundle main body 201 is prevented from being attracted to at least one of the first side surface 4A and the second side surface 4B. The bundle main body 201 is attracted to the magnet 8 after being inserted all the way into the recess 4R, so a decrease in workability when inserting the bundle main body 201 into the tip socket 4 is prevented.

[0106] The first side surface 4A, the second side surface 4B, and the rear surface 4C are each parallel to the rotation axis CX of the tip socket 4. The dimensions of each of the first side surface 4A, the second side surface 4B, and the rear surface 4C in a direction parallel to the second rotation axis are larger than the dimensions of each of the first side surface 4A, the second side surface 4B, and the rear surface 4C in a direction perpendicular to the second rotation axis.

[0107] The above configuration prevents the tip socket 4 from rotating in a state where the central axis of the bundle main body 201 is misaligned with the rotation axis CX of the tip socket 4. Therefore, the attachment 1 can rotate the bundle main body 201 stably.

[0108] [Other embodiments] In the above-described embodiment, the work object held by the tip socket 4 does not have to be the bundle main body 201, but may be, for example, a turnbuckle or a lock nut. [Explanation of symbols]

[0109] 1...Attachment, 2...Housing, 2A...Lower housing, 2B...Upper housing, 2C...Rear housing, 2D...Cylindrical portion, 2E...Support portion, 2F...Support portion, 2G...Support portion, 2H...Support portion, 2K...Guide hole, 2M...Housing opening, 3...Input shaft, 3A...Groove, 4...Tip socket, 4A...First side surface, 4B...Second side surface, 4C...Rear surface, 4D...Recess, 4M...Socket opening, 4R...Recess, 5...Power transmission mechanism, 6...Power cut-off mechanism, 7...Front stop mechanism, 8...Magnet, 9...First Intermediate shaft, 9A...spline hole, 9B...internal space, 9C...support surface, 9D...groove, 9G...internal spline teeth, 10...second intermediate shaft, 10A...groove, 10B...flange portion, 10C...support surface, 10G...external spline teeth, 11...first bevel gear, 12...second bevel gear, 13...spur gear, 14...first intermediate gear, 14A...shaft, 15...second intermediate gear, 15A...shaft, 16...missing tooth gear, 16M...gear opening, 17...ball, 18...leaf spring, 18A...opening, 19...bear bearing, 20...bearing, 21...snap ring, 22...snap ring, 23...coil spring, 24...third intermediate shaft, 25...bearing, 26...bearing, 27...bearing, 28...bearing, 29...bearing, 30...bearing, 31...bearing, 31M...bearing opening, 32...bearing, 32M...bearing opening, 33...rotating member, 331...outer peripheral surface, 332...notch, 332A...first side surface, 332B...second side surface, 332C...contact surface, 332 D...first tapered surface, 332E...second tapered surface, 34...moving member, 35...connecting member, 35A...arc portion, 36...screw, 100...power tool, 101...output shaft, 102...tool hole, 200...steel beam (floor beam), 201...beam body, 202...lower threaded rod, 203...upper threaded rod, 204...base plate, 205...support plate, 206...lower lock nut, 207...upper lock nut, 301...foundation portion, 302...joist, AX...rotating axis (first rotating axis), BX...rotating axis, CX...rotating axis (second rotating axis).

Claims

1. An input shaft that is rotatable about a first rotation axis and to which power is input from a power tool, A tip socket having a recess, A housing having a housing opening into which a work object is inserted and rotatably supporting the tip socket, A power transmission mechanism that transmits the power input to the input shaft to the tip socket, A front stop mechanism that stops the rotation of the tip socket in a state where the socket opening of the recess and the housing opening are aligned, and An attachment.

2. The power transmission mechanism has a toothless gear provided on the outer peripheral surface of the tip socket and a spur gear coupled to the toothless gear and having the same number of teeth as the toothless gear, The front stop mechanism has a rotating member fixed to the spur gear and having a notch, and a moving member inserted into the notch, The attachment according to claim 1.

3. The input shaft is supported by the housing so as to be movable in a front-rear direction parallel to the first rotation axis, The moving member moves in the front-rear direction together with the input shaft, When the input shaft moves forward, the moving member is inserted into the notch, The attachment according to claim 2.

4. The power transmission mechanism has a first intermediate shaft connected to the input shaft and rotating together with the input shaft, A bearing that is held by the housing and supports the first intermediate shaft, The input shaft is supported by the housing via the first intermediate shaft and the bearing, The attachment according to claim 3.

5. A power cut-off mechanism capable of cutting off the power, The front stop mechanism stops the rotation of the tip socket in a state where the socket opening of the recess and the housing opening are aligned in synchronization with the cut-off of the power, The attachment according to claim 1.

6. The power transmission mechanism has a toothless gear provided on the outer peripheral surface of the tip socket and a spur gear coupled to the toothless gear and having the same number of teeth as the toothless gear, The front stop mechanism has a rotating member fixed to the spur gear and having a notch, and a moving member inserted into the notch in synchronization with the cut-off of the power, The attachment according to claim 5.

7. The power transmission mechanism includes a first intermediate shaft connected to the input shaft and rotating together with the input shaft, and a second intermediate shaft spline-coupled to the first intermediate shaft for transmitting the power input to the input shaft to the spur gear. The power interruption mechanism releases the spline coupling. The attachment according to claim 6.

8. It includes a bearing held by the housing and supporting the first intermediate shaft. The input shaft and the first intermediate shaft are movable in the front-rear direction parallel to the first rotation axis. The spline coupling is released by the forward movement of the input shaft and the first intermediate shaft. The attachment according to claim 7.

9. The moving member moves in the front-rear direction together with the input shaft and the first intermediate shaft. The moving member is inserted into the notch by the forward movement of the input shaft and the first intermediate shaft. The attachment according to claim 8.

10. The power transmission mechanism has a first intermediate gear and a second intermediate gear meshing with the spur gear, and the spur gear is coupled to the toothless gear through at least one of the first intermediate gear and the second intermediate gear. In the rotation of the spur gear, at least one of the first intermediate gear and the second intermediate gear meshes with the toothless gear. The attachment according to claim 2 or claim 6.

11. It includes a magnet disposed on the inner surface of the recess. The attachment according to claim 1.

12. The inner surface of the recess includes a first side surface and a second side surface facing the first side surface through a gap. The socket opening is provided between one end of the first side surface and one end of the second side surface. The surface of the magnet is disposed between the other end of the first side surface and the other end of the second side surface. The attachment according to claim 11.

13. The inner surface of the recess includes a back surface connecting the other end of the first side surface and the other end of the second side surface. The magnet is disposed on the back surface. The attachment according to claim 12.

14. The tip socket rotates about a second rotation axis. Each of the first side surface, the second side surface, and the back surface is parallel to the second rotation axis. The dimensions of each of the first side surface, the second side surface, and the back surface in a direction parallel to the second rotation axis are larger than the dimensions of each of the first side surface, the second side surface, and the back surface in a direction orthogonal to the second rotation axis. The attachment according to claim 13.

Images