Attachment and tool system for impact rotary tool

Abstract

To provide an attachment for an impact rotary tool and a tool system capable of easily coping with various works.SOLUTION: An attachment 7 comprises an input shaft 71, a second output shaft 73, and a driving force conversion mechanism 9. Rotational driving force is transmitted from the first output shaft 450 of the impact rotary tool 1 to the input shaft 71.Rotational driving force is transmitted from the input shaft 71 to the second output shaft 73. When transmitting the rotational driving force from the input shaft 71 to the second output shaft 73, the driving force conversion mechanism 9 performs at least one of translation of a rotational axis of rotation, change of an angle of the rotational axis and conversion to thrust driving force from the rotational driving force along the rotational axis.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates generally to an attachment for an impact rotary tool and a tool system, and more particularly to an attachment for an impact rotary tool to which a rotational driving force is transmitted from an output shaft of the impact rotary tool, and a tool system including an attachment for an impact rotary tool. [Background technology]

[0002] Patent Document 1 describes an attachment for a rotary impact tool that measures the torque applied to a shaft that transmits the impact force generated by the rotary impact tool to a tool tip. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-020243 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for an attachment for a rotary impact tool that can be easily adapted to various tasks performed using the rotary impact tool.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and has an object to provide an attachment and a tool system for an impact rotary tool that can be easily used for a variety of tasks. [Means for solving the problem]

[0006] In order to solve the above problems, an attachment for a rotary impact tool according to one embodiment of the present disclosure includes an input shaft, a second output shaft, a driving force conversion mechanism, a housing, and an attachment mechanism. A rotational driving force is transmitted from a first output shaft of the rotary impact tool to the input shaft. The rotational driving force is transmitted from the input shaft to the second output shaft. When transmitting the rotational driving force from the input shaft to the second output shaft, the driving force conversion mechanism converts the rotational driving force into a thrust driving force along the rotation shaft, among the translation of a rotation axis caused by the rotational driving force, a change in angle of the rotational shaft, and a conversion of the rotational driving force into a thrust driving force along the rotational shaft. Either The housing accommodates at least a part of the driving force conversion mechanism. The mounting mechanism attaches and fixes the housing to a tip portion of the rotary impact tool. The rotary impact tool has an impact mechanism and a metal case that accommodates at least a part of the impact mechanism. The mounting mechanism has a claw portion that is hooked onto the rotary impact tool. The claw portion is configured to be elastically secured to the tip portion by a spring. The second output shaft transmits the driving force converted by the driving force converting mechanism to the tool bit.

[0007] A tool system according to one aspect of the present disclosure includes an impact rotary tool attachment and a tool holder to which the impact rotary tool attachment is attached. The above and a rotary impact tool. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide an attachment and a tool system for a rotary impact tool that can be easily adapted to a variety of tasks. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an exploded perspective view of a tool system according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view of the tool system. [Diagram 3] FIG. 3 is a cross-sectional view of a main part of the rotary impact tool. [Figure 4] FIG. 4 is a cross-sectional view of a main part of the tool system. [Diagram 5] FIG. 5 is a perspective view of a main part of a driving force conversion mechanism of the attachment for a rotary impact tool according to the first embodiment. [Figure 6] FIG. 6 is a front view of a connecting shaft of the attachment for a rotary impact tool. [Figure 7] FIG. 7 is a front view of a connecting shaft of an attachment for a rotary impact tool according to a modified example. [Figure 8] FIG. 8 is an exploded perspective view of the tool system according to the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view of a main part of the tool system. [Figure 10] FIG. 10 is a side view of a main part of a driving force conversion mechanism of an attachment for a rotary impact tool according to the second embodiment. [Figure 11] Fig. 11A is a schematic diagram showing one aspect of a tool system according to embodiment 3. Fig. 11B is a schematic diagram showing another aspect of the tool system according to embodiment 3. [Figure 12] FIG. 12 is a schematic diagram of a tool system according to a modified example of the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, common elements in each embodiment described below are given the same reference numerals, and duplicated descriptions of the common elements will be omitted. Each of the following embodiments is merely one of various embodiments of the present disclosure. Each embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Each of the figures described in this disclosure is a schematic diagram, and the ratio of the size and thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. Note that the arrows indicating each direction in the drawings are merely examples, and are not intended to define the direction when the tool system 100 is used. In addition, the arrows indicating each direction in the drawings are merely indicated for explanatory purposes, and do not have any substance.

[0011] (Embodiment 1) (1) Overview First, an overview of a tool system 100 according to the present embodiment will be described with reference to FIGS. 1, 2, and 4. FIG.

[0012] As shown in Fig. 1, the tool system 100 of the present embodiment includes an impact rotary tool 1 and an impact rotary tool attachment 7 (hereinafter referred to as "attachment 7"). As shown in Fig. 2, the attachment 7 is attached to the impact rotary tool 1 and used integrally with the impact rotary tool 1.

[0013] The impact rotary tool 1 of this embodiment is operated by power (electricity, etc.) from a power source such as a battery pack 25. Specifically, as shown in Fig. 3, the electric motor 3 supplied with power from the battery pack 25 (see Fig. 1) rotates, and a rotational driving force is transmitted to the first output shaft 450. When a tip tool such as a driver bit is attached to this first output shaft 450, the impact rotary tool 1 can attach a fastening part such as a screw to be used for work.

[0014] The impact rotary tool 1 of this embodiment also has an impact mechanism 40. When the load torque of the first output shaft 450 exceeds a predetermined level, the impact mechanism 40 applies a striking force in the rotational direction to the first output shaft 450. This allows the impact rotary tool 1 to apply a larger fastening torque to a work target such as a fastening part. There are various types of tools such as an impact wrench and an impact driver as such impact rotary tool 1. The impact rotary tool 1 of this embodiment is an impact driver equipped with a first output shaft 450 capable of holding a bit such as a driver bit.

[0015] The attachment 7 is attached to the rotary impact tool 1 as shown in Fig. 2. As shown in Fig. 4, the attachment 7 includes an input shaft 71 to which a rotational driving force is transmitted from a first output shaft 450 of the rotary impact tool 1, and a second output shaft 73 to which the rotational driving force is transmitted from the input shaft 71. The attachment 7 also includes a driving force conversion mechanism 9 that transmits the rotational driving force from the input shaft 71 to the second output shaft 73. When transmitting the rotational driving force from the input shaft 71 to the second output shaft 73, the driving force conversion mechanism 9 translates the rotation axis Ax0 of the rotation caused by the rotational driving force.

[0016] The attachment 7 of this embodiment includes the driving force conversion mechanism 9, and therefore can easily handle work that has been difficult to perform with conventional rotary impact tools.

[0017] (2)Details Hereinafter, a detailed configuration of the tool system 100 according to the present embodiment will be described with reference to FIGS.

[0018] As shown in Fig. 1, the tool system 100 according to the present embodiment includes an impact rotary tool 1 and an attachment 7. Also, as shown in Fig. 2, the attachment 7 is fixed to the impact rotary tool 1 at a tip portion 211 (see Fig. 1) of the impact rotary tool 1 by a mounting mechanism 8 (see Fig. 4) included in the attachment 7.

[0019] (2.1) Structure of impact rotary tools First, the configuration of the impact rotary tool 1 in the tool system 100 according to this embodiment will be described with reference to Figures 1 to 3. In the following description, the direction in which a drive shaft 41 (see Figure 3) and a first output shaft 450, which will be described later, are aligned is defined as the front-rear direction, the first output shaft 450 side as viewed from the drive shaft 41 is defined as the front, and the drive shaft 41 side as viewed from the first output shaft 450 is defined as the rear. In the following description, the direction in which a body section 21 and a grip section 22, which will be described later, are aligned is defined as the up-down direction, the body section 21 side as viewed from the grip section 22 is defined as the top, and the grip section 22 is defined as the bottom as viewed from the body section 21.

[0020] As shown in Figs. 1 and 2, the impact rotary tool 1 of this embodiment is used in a tool system 100. A rechargeable battery pack 25 is detachably attached to the impact rotary tool 1. The impact rotary tool 1 of this embodiment operates using the battery pack 25 as a power source. That is, the battery pack 25 is a power source that supplies a current to drive the electric motor 3 (see Fig. 3). The battery pack 25 is not a component of the impact rotary tool 1. However, the impact rotary tool 1 may be provided with the battery pack 25. The battery pack 25 includes a battery pack configured by connecting a plurality of secondary batteries (e.g., lithium ion batteries) in series, and a case that houses the battery pack.

[0021] As shown in FIG. 3, the rotary impact tool 1 includes a body 2, an electric motor 3, a transmission mechanism 4, and a trigger volume 24.

[0022] As shown in FIG. 3, the body 2 houses the electric motor 3 and a part of the transmission mechanism 4. As shown in FIG. 2, the body 2 has a trunk section 21, a grip section 22, and an attachment section 23. The trunk section 21 is shaped like a cylinder with an opening at the tip (front end) and a bottom at the rear end. The grip section 22 protrudes downward from the trunk section 21. The attachment section 23 is configured so that the battery pack 25 is removably attached thereto. In this embodiment, the attachment section 23 is provided at the tip section (lower end) of the grip section 22. In other words, the trunk section 21 and the attachment section 23 are connected by the grip section 22.

[0023] The trigger volume 24 protrudes from the grip portion 22. The trigger volume 24 is an operation unit that receives operations for controlling the rotation of the electric motor 3 (see FIG. 3). The electric motor 3 can be switched on and off by pulling the trigger volume 24. The rotation speed of the electric motor 3 can be adjusted by the pulling amount of the trigger volume 24. The larger the pulling amount, the faster the rotation speed of the electric motor 3.

[0024] 3 is, for example, a brushless motor. The motor 3 includes a rotating shaft 31, and converts electric power supplied from a battery pack 25 (see FIG. 2) into a rotational driving force for the rotating shaft 31.

[0025] The transmission mechanism 4 shown in FIG. 3 is located forward of the electric motor 3 in the internal space of the body 21. The transmission mechanism 4 has an impact mechanism 40 and a planetary gear mechanism 48. The impact mechanism 40 includes a drive shaft 41, a hammer 42, a return spring 43, an anvil 45, and two steel balls 49 (rolling elements). The rotational driving force of the rotating shaft 31 of the electric motor 3 is transmitted to the drive shaft 41 via the planetary gear mechanism 48. The drive shaft 41 is disposed between the electric motor 3 and a first output shaft 450.

[0026] The hammer 42 moves relative to the anvil 45, and applies a rotary impact to the anvil 45 by receiving power from the electric motor 3. The hammer 42 includes a hammer body 420 and two protrusions 425 (one in FIG. 3). The two protrusions 425 protrude from the surface of the hammer body 420 on the first output shaft 450 side. The hammer body 420 has a through hole 421 through which the drive shaft 41 passes. The hammer body 420 also has two grooves 423 on the inner peripheral surface of the through hole 421. The drive shaft 41 has two grooves 413 on its outer peripheral surface. The two grooves 413 are connected to each other. Two steel balls 49 are sandwiched between the two grooves 423 and the two grooves 413. The two grooves 423, the two grooves 413, and the two steel balls 49 constitute a cam mechanism. While the two steel balls 49 move, the hammer 42 is movable in the axial direction of the drive shaft 41 relative to the drive shaft 41 and is rotatable relative to the drive shaft 41. As the hammer 42 moves along the axial direction of the drive shaft 41 toward the anvil 45 or away from the anvil 45, the hammer 42 rotates relative to the drive shaft 41.

[0027] The anvil 45 includes a first output shaft 450, two striking parts 451, and a base part 452. The base part 452 is disk-shaped in a plan view from the front-rear direction, and its center is approximately aligned with the central axis of the drive shaft 41. The first output shaft 450 holds the tool tip or the connecting shaft 72 (see FIG. 4). The first output shaft 450 is cylindrical and protrudes forward from the base part 452. The two striking parts 451 protrude from the base part 452 in the radial direction of the base part 452. The anvil 45 faces the hammer body 420 in the axial direction of the drive shaft 41. When the impact mechanism 40 is not performing a striking operation, the hammer 42 and the anvil 45 rotate together while the two projections 425 of the hammer 42 and the two striking parts 451 of the anvil 45 are in contact with each other in the rotation direction of the drive shaft 41. Therefore, at this time, the drive shaft 41, the hammer 42, and the anvil 45 (first output shaft 450) rotate integrally.

[0028] The return spring 43 is sandwiched between the hammer 42 and the planetary gear mechanism 48. The return spring 43 in this embodiment is a conical coil spring. The impact mechanism 40 further includes a plurality of steel balls 50 (two in FIG. 3 ) sandwiched between the hammer 42 and the return spring 43, and a ring 51. This allows the hammer 42 to rotate relative to the return spring 43. The hammer 42 receives a force from the return spring 43 in a direction along the axial direction of the drive shaft 41 toward the first output shaft 450.

[0029] Hereinafter, the movement of the hammer 42 in the axial direction of the drive shaft 41 toward the anvil 45 will be referred to as "the hammer 42 moves forward." Also, hereinafter, the movement of the hammer 42 in the axial direction of the drive shaft 41 away from the anvil 45 will be referred to as "the hammer 42 moves backward."

[0030] In the impact mechanism 40, when the load torque becomes equal to or greater than a predetermined value, the impact operation is started. That is, when the load torque becomes larger, the component of the force generated between the hammer 42 and the anvil 45 in the direction of moving the hammer 42 backward also becomes larger. When the load torque becomes equal to or greater than a predetermined value, the hammer 42 moves backward while compressing the return spring 43. Then, as the hammer 42 moves backward, the two protrusions 425 of the hammer 42 climb over the two striking portions 451 of the anvil 45, and the hammer 42 rotates. After that, the hammer 42 moves forward by receiving the return force from the return spring 43. Then, when the drive shaft 41 rotates approximately half a turn, the two protrusions 425 of the hammer 42 collide with the side surfaces of the two striking portions 451 of the anvil 45. In the impact mechanism 40, the two protrusions 425 of the hammer 42 collide with the two striking portions 451 of the anvil 45 every time the drive shaft 41 rotates approximately half a turn. In other words, the hammer 42 applies a rotational blow to the anvil 45 every time the drive shaft 41 rotates approximately half a turn.

[0031] In this way, in the impact mechanism 40, collisions between the hammer 42 and the anvil 45 occur repeatedly. Due to the torque caused by these collisions, it is possible to more strongly tighten fastening members such as screws, bolts, or nuts compared to a case where there is no collision.

[0032] Such a transmission mechanism 4 is housed in a metal hammer case 400. The hammer case 400 has a circular through hole 402 in a front surface 401, through which the first output shaft 450 passes. The hammer case 400 also has a protruding portion 403 that protrudes forward from the periphery of the through hole 402. The protruding portion 403 is cylindrical. The protruding portion 403 has a plurality of recesses 404 (two in the example of FIG. 3) provided on the outer circumferential surface. The claw portions 81 of the attachment 7 are hooked onto the recesses 404 (see FIG. 4).

[0033] The first output shaft 450 has an insertion opening 62 and a fixing mechanism 63. A tip tool such as a driver bit or a connecting shaft 72 (rod-shaped body) of the attachment 7 is attached to the insertion opening 62. The shape of the insertion opening 62 in this embodiment is a regular hexagon when viewed from the axial direction (front-rear direction) of the connecting shaft 72. The "regular hexagonal shape" in this disclosure is not limited to a "regular hexagon" whose six sides are equal in length and whose six interior angles are equal, but also includes a "shape that can be regarded as a regular hexagon" that is similar to this regular hexagon.

[0034] For example, when a driver bit is attached to the first output shaft 450, the transmission mechanism 4 transmits the rotational driving force of the rotating shaft 31 of the electric motor 3 to the driver bit via the first output shaft 450. This rotates the driver bit. When the driver bit is in contact with a fastening member (such as a screw), the fastening member can be tightened or loosened by the rotation of the driver bit. The transmission mechanism 4 has an impact mechanism 40. The impact rotary tool 1 of this embodiment is an electric impact driver capable of tightening a screw while performing an impact operation by the impact mechanism 40. In the impact operation, an impact force is applied to a fastening member such as a screw via the first output shaft 450.

[0035] Furthermore, when the connecting shaft 72 of the attachment 7 is mounted on the first output shaft 450 (see FIG. 4), the transmission mechanism 4 transmits the rotational driving force of the rotating shaft 31 of the electric motor 3 to the connecting shaft 72 via the first output shaft 450. This causes the connecting shaft 72 to rotate. As the connecting shaft 72 rotates, the connecting shaft 72 transmits the rotational driving force to the input shaft 71 of the attachment 7. The operation of the attachment 7 after the rotational driving force is transmitted to the input shaft 71 will be described later in "(2.2) Configuration of the Attachment."

[0036] The fixing mechanism 63 has a plurality of holes 64 (two in the example of FIG. 3), a plurality of steel balls 65 (spherical bodies), a spring 66, a bit holder 67, and a spring 68. The fixing mechanism 63 is a mechanism for holding a tip tool such as a driver bit with respect to the impact rotary tool 1. The two holes 64 are provided at the upper and lower ends of the insertion opening 62 on the front side of the tip of the protruding part 403 of the hammer case 400, and are elliptical holes with the longitudinal direction being the front-rear direction. The two steel balls 65 are fitted into the two holes 64. The bit holder 67 has a cylindrical shape with openings on the front and rear sides, and covers the outer periphery of the first output shaft 450 on the tip side of the first output shaft 450. The spring 66 is a spiral spring that covers the outer periphery of the first output shaft 450 between the first output shaft 450 and the bit holder 67. When the tool tip is inserted into the insertion opening 62, the tool tip pushes the two steel balls 65 in a vertically and obliquely backward direction against the elastic force of the spring 66. When the tool tip is inserted into the insertion opening 62, the two steel balls 65 sandwich the tool tip in the vertical direction by the elastic force of the spring 66. When the tool tip has a groove corresponding to the steel balls 65, the groove of the tool tip and the steel balls 65 are fitted together, thereby fixing the tool tip to the impact rotary tool 1. The spring 68 is a spiral spring located forward of the spring 66 and covers the outer periphery of the first output shaft 450 between the first output shaft 450 and the bit holder 67. By moving the bit holder 67 forward against the elastic force of the spring 68, a space is created between the bit holder 67 and the spring 66 in the vertical direction of the two holes 64. When the two steel balls 65 move into this space, the engagement between the grooves of the tool bit and the steel balls 65 is released.

[0037] As described above, the two (pair) steel balls 65 are movable in the front-rear and up-down directions. When the tool bit is not pushing the two steel balls 65 diagonally backward up and down against the elastic force of the spring 66 (default state), the distance between the two steel balls 65 in the up-down direction is the minimum distance W1. In addition, the connecting shaft 72 of the attachment 7 of this embodiment does not have a groove into which the steel balls 65 fit.

[0038] In this manner, the first output shaft 450 is configured to hold a tool tip such as a driver bit. In this embodiment, the impact rotary tool 1 does not include a tool tip.

[0039] (2.2) Attachment Configuration Next, the configuration of the attachment 7 in the tool system 100 according to this embodiment will be described with reference to FIGS.

[0040] As shown in FIG. 4, the attachment 7 according to this embodiment includes a housing 70, an input shaft 71, a connecting shaft 72, a second output shaft 73, an attachment mechanism 8, and a driving force conversion mechanism 9.

[0041] The housing 70 accommodates the input shaft 71, the connecting shaft 72, a portion of the second output shaft 73, a portion of the mounting mechanism 8, and the driving force conversion mechanism 9.

[0042] The connecting shaft 72 connects the first output shaft 450 and the input shaft 71, and drives the first output shaft 450 and the input shaft 71 integrally. The connecting shaft 72 transmits the rotational driving force of the first output shaft 450 from the first output shaft 450 to the input shaft 71.

[0043] In addition, the connecting shaft 72 has an input portion 721 and an output portion 722 .

[0044] The input part 721 is a part on the side where the rotational driving force is transmitted from the impact rotary tool 1 in the axial direction (front-rear direction) of the connecting shaft 72. The input part 721 is inserted into the insertion port 62 of the impact rotary tool 1. The input part 721 has a regular hexagonal prism shape as a whole, and has a shape corresponding to the shape of the insertion port 62 of the impact rotary tool 1. Specifically, the cross-sectional shape of the input part 721 and the shape of the insertion port 62 are the same shape. For example, when the shape of the insertion port 62 is a regular hexagon as in this embodiment, the cross-sectional shape of the input part 721 is a regular hexagon. The shape of the insertion port 62 is a regular hexagon. In this disclosure, the "regular hexagonal prism" is not limited to a "regular hexagonal prism" whose bottom and top surfaces are "regular hexagons", whose six sides connecting corresponding vertices of the bottom and top surfaces are equal in length, and whose six sides are perpendicular to the bottom and top surfaces, but also includes a "shape that can be regarded as a regular hexagonal prism" similar to this regular hexagonal prism.

[0045] The input part 721 includes a thin shaft part 723. The thin shaft part 723 has a portion thinner than the output part 722 from a position facing at least two steel balls 65 to the tip on the impact rotary tool 1 side. As shown in Fig. 4, the thin shaft part 723 has a portion thinner than the output part 722 in the direction facing the two steel balls 65, so that the attachment 7 of this embodiment can be easily inserted into and removed from the impact rotary tool 1.

[0046] The thin shaft portion 723 of this embodiment is thinner than the output portion 722 because multiple recesses 724 (see FIG. 5) are provided from the position facing the two steel balls 65 to the tip of the impact rotary tool 1. In the example of FIG. 4 and FIG. 6, the width W2 between the two (pair) recesses 724 of the thin shaft portion 723 in the direction (up-down direction) perpendicular to the axial direction (front-rear direction) of the connecting shaft 72 is smaller than the width W3 of the output portion 722. On the other hand, the portion of the input portion 721 of this embodiment that is not the thin shaft portion 723 has the same shape and dimensions as the output portion 722. In other words, the width of the portion of the input portion 721 that is not the thin shaft portion 723 in the up-down direction is equal to the width W3 of the output portion 722.

[0047] Furthermore, the width W2 between the pair of recesses 724 in this embodiment is equal to or less than the minimum distance W1 (see FIG. 3) between the pair of steel balls 65. In other words, in the up-down direction, the width W2 of the portion of the thin shaft portion 723 facing the pair of steel balls 65 is equal to or less than the minimum distance W1 between the pair of steel balls 65. The width W2 can also be said to be the width of the thin shaft portion 723 in the direction facing the steel ball 65. Because the width W2 between the pair of recesses 724 is equal to or less than the minimum distance W1 between the pair of steel balls 65, the thin shaft portion 723 in this embodiment can reduce the force pressing from the steel ball 65.

[0048] 6, the thin shaft portion 723 has recesses 724 provided on each side of the regular hexagonal prism shape. That is, six recesses 724 are provided in the thin shaft portion 723 of the present embodiment.

[0049] As shown in FIG. 6, each of the six recesses 724 is arc-shaped when viewed from above in the axial direction of the connecting shaft 72, and has a shape that conforms to the steel ball 65.

[0050] Further, the thin shaft portion 723 has six protrusions 725 between adjacent recesses 724 of the six recesses 724. Here, each of the six protrusions 725 in this embodiment is a part of each vertex of a regular hexagon. Each of the six protrusions 725 comes into contact with the inner wall 621 of the insertion opening 62 when the input part 721 is inserted into the insertion opening 62 of the impact rotary tool 1. Since the protrusions 725 come into contact with the inner wall 621 of the insertion opening 62, the rotational driving force from the impact rotary tool 1 is also transmitted to the thin shaft portion 723.

[0051] As shown in FIG. 4, the output part 722 extends forward from the input part 721 along the front-rear direction and is a part that transmits a rotational driving force to the input shaft 71. The shape of the output part 722 in this embodiment is a regular hexagonal prism, which corresponds to the shape of the insertion opening 711 of the input shaft 71. Specifically, the cross-sectional shape of the output part 722 and the shape of the insertion opening 711 are the same shape. For example, when the output part 722 is a regular hexagonal prism as in this embodiment, the cross-sectional shape of the output part 722 is a regular hexagon, and therefore the shape of the insertion opening 711 is a regular hexagon. The output part 722 in this embodiment is press-fitted into the insertion opening 711 of the input shaft 71. In other words, the connecting shaft 72 and the input shaft 71 in this embodiment are integrally configured, and the connecting shaft 72 and the input shaft 71 drive integrally.

[0052] The attachment mechanism 8 fixes the housing 70 of the attachment 7 to the tip portion 211 of the rotary impact tool 1. The attachment mechanism 8 has a plurality of claws 81 (two in FIG. 4) and a plurality of springs 82 (two in FIG. 4).

[0053] The claw portion 81 has a surface portion 811, a base portion 812, an axis portion 813, a protruding portion 814, and a hook portion 816. The surface portion 811 is exposed from the housing 70 and has a rectangular shape in a plan view from the top-bottom direction. The base portion 812 protrudes toward the connecting shaft 72 side at the rear side of the surface portion 811. The axis portion 813 is an axis along the left-right direction provided at a tip end 815 of the base portion 812 on the connecting shaft 72 side. The axis portion 813 is rotatably supported by a bearing 707 of the inner wall 701 of the housing 70. The protruding portion 814 protrudes toward the connecting shaft 72 side from the back side (inside) of the surface portion 811 and has a cylindrical shape. A spiral spring 82 is wound around the outer periphery of the protruding portion 814. The spring 82 is disposed between the surface portion 811 and the inner wall 701 in a state in which the protruding portion 814 is housed in the inner periphery. The hook portion 816 is shaped like a hook and protrudes rearward from the connecting shaft 72 side of the rear end of the base portion 812. A tip 818 (lower end or upper end) of the hook portion 816 hooks into the recessed portion 404 of the hammer case 400, and the claw portion 81 fixes the housing 70 of the attachment 7 to the rotary impact tool 1. The elastic force of the spring 82 causes the claw portion 81 to press the recessed portion 404 of the hammer case 400 toward the connecting shaft 72 side.

[0054] Moreover, the claw portion 81 further has an operating portion 817. When a user of the impact rotary tool 1 applies force to the operating portion 817 in a direction against the elastic force of the spring 82, i.e., toward the connecting shaft 72 side, the hook portion 816 moves outward (in a direction away from the connecting shaft 72) around the shaft portion 813. In other words, when a user applies force to the operating portion 817 in a direction against the elastic force of the spring 82, the hook between the tip 818 of the hook portion 816 and the recess 404 is released. That is, the claw portion 81 is displaced by the elastic force of the spring 82 between a position where it is hooked on the recess 404 and a position where it is released from the hook with the recess 404.

[0055] The input shaft 71 is disposed in front of the connecting shaft 72 so that the central axis of the input shaft 71 roughly coincides with the central axis of the connecting shaft 72. As described above, the input shaft 71 drives integrally with the connecting shaft 72, and a rotational driving force is transmitted from the connecting shaft 72 to the input shaft 71. The input shaft 71 is rotatably supported by bearings 702 fixed to two inner walls 701 of the housing 70.

[0056] The driving force conversion mechanism 9 has a first gear 91 provided on the outer periphery of the input shaft 71 and a second gear 92 provided on the outer periphery of the second output shaft 73. The first gear 91 and the input shaft 71 drive integrally. The second gear 92 and the second output shaft 73 drive integrally. As shown in FIG. 5, the driving force conversion mechanism 9 further has a third gear 93 located between the first gear 91 and the second gear 92 in the vertical direction. The third gear 93 has an axis 931 parallel to the input shaft 71 and the second output shaft 73. Each of the first gear 91, the second gear 92, and the third gear 93 is a spur gear having a plurality of teeth protruding in the radial direction. The first gear 91 and the third gear 93 mesh with each other, and the third gear 93 and the second gear 92 mesh with each other.

[0057] The driving force conversion mechanism 9 further has a pair of support plates 94. The pair of support plates 94 are located forward of the tip (front end) of the connecting shaft 72. The pair of support plates 94 are located at a distance in the front-rear direction that is greater than the axial lengths of the first gear 91, the second gear 92, and the third gear 93. The pair of support plates 94 rotatably support the input shaft 71, the shaft 931 of the third gear 93, and the second output shaft 73.

[0058] When a rotational driving force is transmitted to the input shaft 71, the input shaft 71 and the first gear 91 rotate integrally. Since the first gear 91 and the third gear 93 are meshed with each other, when the first gear 91 rotates, the rotational driving force is transmitted from the first gear 91 to the third gear 93. The third gear 93, to which the rotational driving force is transmitted from the first gear 91, rotates in a direction opposite to the rotational direction of the first gear 91. Since the third gear 93 and the second gear 92 are meshed with each other, when the third gear 93 rotates, the rotational driving force is transmitted from the third gear 93 to the second gear 92. The second gear 92, to which the rotational driving force is transmitted from the third gear 93, rotates in a direction opposite to the rotational direction of the third gear 93. In other words, the second gear 92 rotates in the same direction as the first gear 91. The third gear 93 drives integrally with the second output shaft 73, and the rotational driving force transmitted to the third gear 93 is transmitted to the second output shaft 73.

[0059] As described above, the driving force conversion mechanism 9 of this embodiment indirectly transmits the rotational driving force from the first gear 91 to the second gear 92 via the third gear 93. The rotation axis Ax1 of the input shaft 71 and the rotation axis Ax2 of the second output shaft 73 are generally parallel to each other. That is, when transmitting the rotational driving force from the input shaft 71 to the second output shaft 73, the driving force conversion mechanism 9 of this embodiment translates the rotation axis Ax0 of the rotation caused by the rotational driving force. Specifically, the driving force conversion mechanism 9 of this embodiment moves the rotation axis Ax0 of the rotation caused by the rotational driving force from the rotation axis Ax1 of the input shaft 71 to the rotation axis Ax2 of the second output shaft 73.

[0060] As shown in FIG. 4, the second output shaft 73 is rotatably supported by a bearing 703 fixed to the housing 70. The second output shaft 73 is generally parallel to the input shaft 71 and aligned with the input shaft 71 in the up-down and left-right directions. The second output shaft 73 has an insertion opening 731 and a fixing mechanism 732. A tip tool such as a driver bit is attached to the insertion opening 731. When a driver bit is attached to the second output shaft 73, when the second output shaft 73 rotates, the driver bit rotates integrally with the second output shaft 73. When the driver bit rotates while being in contact with a fastening member (such as a screw), the fastening member can be tightened or loosened.

[0061] The fixing mechanism 732 has a plurality of holes 733 (two in the example of FIG. 4), a plurality of steel balls 734 (two in the example of FIG. 3), a spring 735, a bit holder 736, and a spring 737. The two holes 733 are provided at the upper and lower ends of the insertion opening 731 on the front side of the tip of the housing 70, and are elliptical holes with the longitudinal direction being the front-rear direction. The two steel balls 734 are fitted into the two holes 733. The bit holder 736 has a cylindrical shape with openings on the front and rear sides, and covers the outer periphery of the second output shaft 73 on the front side of the tip of the housing 70. The spring 735 is a spiral spring that covers the outer periphery of the second output shaft 73 between the second output shaft 73 and the bit holder 736. When the tool tip is inserted into the insertion opening 731, the tool tip pushes the two steel balls 734 in a vertically and obliquely backward direction against the elastic force of the spring 735. When the tool tip is inserted into the insertion opening 731, the two steel balls 734 sandwich the tool tip in the vertical direction by the elastic force of the spring 735. When the tool tip is provided with a groove corresponding to the steel balls 734, the groove of the tool tip and the steel balls 734 are fitted together, thereby fixing the tool tip to the attachment 7. The spring 737 is a spiral spring located forward of the spring 735 and covers the outer periphery of the second output shaft 73 between the second output shaft 73 and the bit holder 736. By moving the bit holder 736 forward against the elastic force of the spring 737, a space is created between the bit holder 736 and the spring 735 in the vertical direction of the two holes 733. When the two steel balls 734 move into this space, the engagement between the grooves of the tool bit and the steel balls 734 is released.

[0062] The load torque of the second output shaft 73 is transmitted to the first output shaft 450 via the second gear 92, the third gear 93, the first gear 91, the input shaft 71, and the connecting shaft 72. As described above, the impact mechanism 40 applies a rotational impact force to the first output shaft 450 when the load torque of the first output shaft 450 exceeds a predetermined level. This rotational impact force is transmitted to the second output shaft 73 via the connecting shaft 72, the input shaft 71, the first gear 91, the third gear 93, and the second gear 92, similar to the rotational driving force. This allows the second output shaft 73 (attachment 7) to apply a larger fastening torque to a work target such as a fastening part.

[0063] (3) Effects As described above, the tool system 100 according to the present embodiment includes the impact rotary tool 1 and the attachment 7. The attachment 7 includes the input shaft 71, the second output shaft 73, and the driving force conversion mechanism 9 that transmits the rotational driving force transmitted from the first output shaft 450 of the impact rotary tool 1 from the input shaft 71 to the second output shaft 73. Since the rotation axis Ax1 of the input shaft 71 and the rotation axis Ax2 of the second output shaft 73 are generally parallel and do not coincide with each other, the driving force conversion mechanism 9 translates the rotation axis Ax0 of the rotation of the rotational driving force. In the tool system 100 according to the present embodiment, the attachment 7 that translates the rotation axis Ax0 of the rotation of the rotational driving force is attached to the impact rotary tool 1, so that the tool system 100 can easily handle work that was difficult to perform with a conventional impact rotary tool.

[0064] Moreover, the attachment 7 of this embodiment further includes a housing 70 that houses at least a part of the driving force conversion mechanism 9, and an attachment mechanism 8 that attaches and fixes the housing 70 to the tip portion 211 of the impact rotary tool 1. Since the housing 70 is fixed to the tip portion 211 of the impact rotary tool 1 that is relatively close to the attachment 7, it is possible to reduce vibration of the attachment 7 relative to the impact rotary tool 1. Furthermore, since it is possible to reduce vibration of the attachment 7 relative to the impact rotary tool 1, driving force conversion in the driving force conversion mechanism 9 is less likely to be hindered by vibration.

[0065] The attachment mechanism 8 is attached to a metallic portion of the rotary impact tool. Specifically, it is attached to a hammer case 400 (metallic case) that houses at least a part of the impact mechanism 40. The metallic hammer case 400 does not easily chip, so it is possible to reduce the possibility that the portion where the attachment mechanism 8 is attached will chip due to the effect of an impact or the like.

[0066] Moreover, the mounting mechanism 8 of this embodiment has a claw portion 81. The claw portion 81 is hooked into the recessed portion 404 of the impact rotary tool 1 (hammer case 400), so that the attachment 7 can be fixed to the impact rotary tool 1 more firmly.

[0067] Furthermore, since the claw portion 81 of this embodiment is hooked into the recessed portion 404 by the elastic force of the spring 82, the attachment 7 can be fixed to the rotary impact tool 1 more firmly.

[0068] Moreover, the attachment 7 of this embodiment has a connecting shaft 72. The connecting shaft 72 connects the first output shaft 450 and the input shaft 71, and drives the first output shaft 450 and the input shaft 71 together. The connecting shaft 72 transmits the rotational driving force of the first output shaft 450 to the input shaft 71. Since the rotational driving force of the first output shaft 450 can be indirectly transmitted to the input shaft 71, the degree of freedom in designing the input shaft 71 and the first output shaft 450 of the impact rotary tool 1 can be increased.

[0069] Further, the driving force conversion mechanism 9 of this embodiment has a first gear 91 provided on the input shaft 71 and a second gear 92 provided on the second output shaft 73. The driving force conversion mechanism 9 indirectly transmits the rotational driving force from the first gear 91 to the second gear 92 (via a third gear 93), thereby transmitting the rotational driving force to the second output shaft 73 aligned with the input shaft 71 in the up-down and left-right directions. That is, the driving force conversion mechanism 9 of this embodiment translates the rotation axis Ax0 of the rotation of the rotational driving force transmitted to the input shaft 71. As a result, even if a work target such as a fastening member is located at a local position, a large tightening torque can be obtained with a small pressing force, making it easy to perform the work.

[0070] (4) Variations Below, we will list some modified examples of the first embodiment. The modified examples described below can be applied in appropriate combination with the first embodiment.

[0071] The driving force conversion mechanism 9 may be configured to not only translate the rotation axis Ax0 of rotation by the rotational driving force, but also change the angle of the rotation axis Ax0 or convert the rotational driving force into a thrust driving force along the rotation axis Ax0.

[0072] The driving force conversion mechanism 9 may have a gear other than the third gear 93 as a path for transmitting the rotational driving force from the first gear 91 to the second gear 92. In other words, the driving force conversion mechanism 9 may have four or more gears for transmitting the rotational driving force from the input shaft 71 to the second output shaft 73.

[0073] It is not essential that the driving force conversion mechanism 9 has the third gear 93, and the rotational driving force may be transmitted directly from the first gear 91 to the second gear 92. In this case, the first gear 91 and the second gear 92 are arranged to mesh with each other. When the rotational driving force is transmitted directly from the first gear 91 to the second gear 92, the rotational direction of the first gear 91 (input shaft 71) and the rotational direction of the second gear 92 (second output shaft 73) are opposite to each other.

[0074] It is not essential that the attachment mechanism 8 has the spring 82 . For example, the hook portion 816 may be hooked by pressing against the recess 404 of the hammer case 400 by the elastic force of the hook portion 816 itself.

[0075] A portion other than the hammer case 400, such as a part of the body 21 of the rotary impact tool 1, may be made of metal so that the attachment mechanism 8 can be attached thereto.

[0076] The shape of the insertion opening 62 is not limited to a regular hexagon. The shape of the insertion opening 62 may be another regular polygon, such as an equilateral triangle or a square. Here, the "regular polygon" refers not only to a "regular polygon" in the strict sense in which all sides are equal in length and all interior angles are equal, but also to a "shape that can be considered as a regular polygon" that is similar to this regular polygon. The shape of the insertion opening 62 may also be a circle or an ellipse.

[0077] The shape of the input area 721 is not limited to a regular hexagonal prism. The shape of the input area 721 may be another regular polygonal prism, such as a regular triangular prism or a square prism. Here, the term "regular polygonal prism" refers not only to a "regular polygon" in the strict sense, which is a "regular polygon" with the same bottom and top surfaces, in which all sides connecting corresponding vertices of the bottom and top surfaces are equal in length, and all sides are perpendicular to the bottom and top surfaces, but also to a "shape that can be regarded as a regular polygonal prism" that is similar to this regular polygonal prism. The shape of the input area 721 may be a circular cylinder or an elliptical cylinder.

[0078] It is not essential that the thin shaft portion 723 of the connecting shaft 72 has the recessed portion 724 and the protruding portion 725. As shown in Fig. 7, the thin shaft portion 723 of the modified example does not have the recessed portion 724 and the protruding portion 725. The thin shaft portion 723 of the modified example has a regular hexagonal shape when viewed from the axial direction of the connecting shaft 72, and is a regular hexagonal column extending toward the output portion 722 along the axial direction. As in the first embodiment, the width W2 of the thin shaft portion 723 in the up-down direction is smaller than the width W3 of the output portion 722 in the up-down direction.

[0079] The shape of the thin shaft portion 723 is not limited to a regular hexagonal prism, and may be another regular polygonal prism, or may be a circular cylinder or an elliptical cylinder. The width W2 of the thin shaft portion 723 in the direction facing the steel ball 65 is required to be smaller than the width W3 of the output part 722 in the same direction.

[0080] The shape of the output part 722 is not limited to a regular hexagonal prism. The shape of the output part 722 may be another regular polygonal prism. Furthermore, the shape of the output part 722 may be a circular cylinder or an elliptical cylinder.

[0081] In the first embodiment, the rotary impact tool 1 is an impact driver, for example. However, the rotary impact tool 1 is not limited to an impact driver, and may be, for example, an impact wrench.

[0082] (Embodiment 2) (1) Overview As shown in Fig. 8, the tool system 100 of this embodiment differs from the tool system 100 of the first embodiment (see Fig. 4) in that the tool system 100 of this embodiment includes an attachment 7a that converts the angle of the rotation axis Ax0 of the rotation of the rotational driving force transmitted to the input shaft 71 (see Fig. 9). Hereinafter, the same components as those of the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted as appropriate.

[0083] (2)Details As shown in FIG. 9, the attachment 7a of this embodiment includes a housing 70, an input shaft 71, a connecting shaft 72, a second output shaft 73, an attachment mechanism 8, and a driving force conversion mechanism 9a.

[0084] The input shaft 71 of this embodiment is rotatably supported by a bearing 704 fixed to the housing 70 .

[0085] The second output shaft 73 in this embodiment is provided at a position intersecting with the input shaft 71. Specifically, the input shaft 71 extends along the front-rear direction, whereas the second output shaft 73 extends along the up-down direction. The second output shaft 73 is rotatably supported by bearings 705 and 706 fixed to the housing 70.

[0086] The driving force conversion mechanism 9a of this embodiment has a first gear 91a provided on the outer periphery of the input shaft 71 and a second gear 92a provided on the outer periphery of the second output shaft 73. The first gear 91a and the input shaft 71 drive integrally. Also, the second gear 92a and the second output shaft 73 drive integrally.

[0087] In this embodiment, the first gear 91a and the second gear 92a are bevel gears whose orientations differ by 90 degrees and are meshed with each other (see FIG. 10). For example, when the input shaft 71 and the first gear 91a rotate clockwise about the rotation axis Ax1, the second output shaft 73 and the second gear 92a rotate clockwise about the rotation axis Ax3. The rotation axis Ax1 and the rotation axis Ax3 differ in orientation by 90 degrees and intersect with each other.

[0088] As described above, the driving force conversion mechanism 9a of this embodiment changes the angle of the rotation axis Ax0 of the rotation caused by the rotation drive force when transmitting the rotation drive force from the input shaft 71 to the second output shaft 73. Specifically, the driving force conversion mechanism 9a of this embodiment changes the angle of the rotation axis Ax0 of the rotation caused by the rotation drive force from the angle of the rotation axis Ax1 of the input shaft 71 to the angle of the rotation axis Ax3 of the second output shaft. The angle of the rotation axis Ax0 refers to the angle between the above-mentioned axis and the rotation axis Ax0 when a certain axis is used as a reference. Here, the rotation axis Ax1 of the input shaft 71 is used as the reference.

[0089] (3) Effects The driving force conversion mechanism 9a of this embodiment has a first gear 91a provided on the input shaft 71 and a second gear 92a provided on the second output shaft 73. The driving force conversion mechanism 9a transmits the rotational driving force directly from the first gear 91a to the second gear 92a, thereby transmitting the rotational driving force to the second output shaft 73 intersecting with the input shaft 71. That is, the driving force conversion mechanism 9a of this embodiment changes the angle of the rotation axis Ax0 of the rotation of the rotational driving force transmitted to the input shaft 71. As a result, even if a work target such as a fastening member is at an angle at which it is difficult to apply force, a large tightening torque can be obtained with a small pressing force, making it easy to perform the work.

[0090] (4) Variations Below, we will list some modified examples of the embodiment 2. The modified examples described below can be applied in appropriate combination with the embodiment 1 and the modified examples of the embodiment 1.

[0091] The driving force conversion mechanism 9a may be configured to not only change the angle of the rotation axis Ax0 of rotation by the rotational driving force, but also to translate the rotation axis Ax0 or convert the rotational driving force into a thrust driving force along the rotation axis Ax0.

[0092] In the driving force conversion mechanism 9a, it is not necessary for the first gear 91a and the second gear 92a to directly mesh with each other. Another gear may be placed between the first gear 91a and the second gear 92a so that the rotational driving force is indirectly transmitted from the first gear 91a to the second gear 92a.

[0093] (Embodiment 3) (1) Overview The tool system 100 of the third embodiment differs from the tool system 100 of the first embodiment in that it includes an attachment 7b as shown in Fig. 11A and Fig. 11B. The attachment 7b of the present embodiment includes a driving force conversion mechanism 9b that converts a rotational driving force transmitted to the input shaft 71 into a thrust driving force along the rotation axis Ax0. Hereinafter, the same components as those of the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted as appropriate.

[0094] (2) Details As shown in Figures 11A and 11B, the attachment 7b of this embodiment includes a housing 70, an input shaft 71, a connecting shaft 72, a second output shaft 73b, an attachment mechanism 8, a driving force conversion mechanism 9b, a movable blade 74, and a fixed blade 75.

[0095] The second output shaft 73b in this embodiment has a longitudinal direction along the rotation axis Ax1 of the input shaft 71. The second output shaft 73b and the input shaft 71 are aligned along the rotation axis Ax0 of the rotation caused by the rotational driving force. The second output shaft 73b is cylindrical with an open rear end and a bottomed front end (tip). The second output shaft 73b is disposed on the outer periphery side of the input shaft 71 so as to cover the input shaft 71 on the inner periphery side. The second output shaft 73b is supported by the housing 70 so as not to rotate.

[0096] The driving force conversion mechanism 9b of this embodiment has a first screw portion 95 and a second screw portion 96. The first screw portion 95 is provided on the outer periphery of the input shaft 71. The second screw portion 96 is provided on the inner periphery of the second output shaft 73b and is screwed into the first screw portion 95. When the input shaft 71 rotates, the first screw portion 95 rotates integrally with the input shaft 71. When the first screw portion 95 rotates with the first screw portion 95 and the second screw portion 96 engaged with each other, a thrust driving force in the front-rear direction is transmitted to the second screw portion 96. That is, the driving force conversion mechanism 9b of this embodiment converts the rotational driving force transmitted to the input shaft 71 into a thrust driving force along the rotation axis Ax0 of the rotation caused by the rotational driving force, and transmits the thrust driving force to the second screw portion 96 (the second output shaft 73b).

[0097] The direction of the forward / rearward thrust driving force transmitted to the second screw portion 96 varies depending on the rotation direction of the first screw portion 95. For example, when the first screw portion 95 rotates clockwise around the rotation axis Ax0, a forward thrust driving force is transmitted to the second screw portion 96. When a forward thrust driving force is transmitted to the second screw portion 96, the second output shaft 73 moves forward within the movable range. When the first screw portion 95 rotates counterclockwise around the rotation axis Ax0, a rearward thrust driving force is transmitted to the second screw portion 96. When a rearward thrust driving force is transmitted to the second screw portion 96, the second output shaft 73b moves rearward within the movable range.

[0098] As described above, when transmitting the rotational driving force from the input shaft 71 to the second output shaft 73, the driving force conversion mechanism 9b of this embodiment converts the rotational driving force into a thrust driving force along the rotation axis Ax0.

[0099] The movable blade 74 is a blade that moves integrally with the second output shaft 73b. When the second output shaft 73b moves forward, the movable blade 74 also moves forward. When the second output shaft 73b moves backward, the movable blade 74 also moves backward. The fixed blade 75 is a blade that is fixed to the housing 70. As shown in FIG. 11A, the position of the movable blade 74 at which the cutting object T1 can be placed between the movable blade 74 and the fixed blade 75 is called the first position. Also, as shown in FIG. 11B, the position of the movable blade 74 at which the movable blade 74 and the fixed blade 75 overlap in a direction perpendicular to the rotation axis Ax1 of the input shaft 71 is called the second position. While the rotational driving force is transmitted to the input shaft 71 and the movable blade 74 is displaced from the first position to the second position, the cutting object T1 is cut by the movable blade 74 and the fixed blade 75.

[0100] (3) Effects The driving force conversion mechanism 9b of this embodiment has a first screw portion 95 provided on the input shaft 71 and a second screw portion 96 provided on the second output shaft 73 and screwed into the first screw portion 95. When transmitting a rotational driving force from the input shaft 71 to the second output shaft 73, the driving force conversion mechanism 9b moves the second screw portion 96 and the second output shaft 73b along the rotation axis Ax0 of the rotation caused by the rotational driving force by the rotation of the first screw portion 95 caused by the rotational driving force transmitted to the input shaft 71. That is, the driving force conversion mechanism 9b of this embodiment converts the rotational driving force into a thrust driving force by moving the second screw portion 96 and the second output shaft 73b along the rotation axis Ax0 by the rotation of the first screw portion 95. The attachment 7b of this embodiment converts the rotational driving force transmitted to the input shaft 71 into a thrust driving force along the rotation axis Ax0 of the rotational driving force, thereby increasing the number of tasks that the tool system 100 can handle.

[0101] In the tool system 100 of the present embodiment, the load torque of the input shaft 71 is transmitted to the first output shaft 450 via the connecting shaft 72. As described above, when the load torque of the first output shaft 450 exceeds a predetermined level, the impact mechanism 40 applies a rotational impact force to the first output shaft 450. This rotational impact force is transmitted to the input shaft 71 via the connecting shaft 72, like the rotational driving force, and is converted into a thrust driving force by the driving force conversion mechanism 9b and transmitted to the second output shaft 73b. As a result, even if a large force is required to cut the cutting target T1, the cutting target T1 can be easily cut by the thrust driving force converted from the impact force generated by the impact mechanism 40.

[0102] (4) Variations Below, we will list modified examples of embodiment 3. The modified examples described below can be applied in appropriate combination with embodiment 1 and the modified examples of embodiment 1, and embodiment 2 and the modified examples of embodiment 2.

[0103] 12, the attachment 7c may be an attachment in which the movable blade 74 of the third embodiment is replaced with a movable part 76, and the fixed blade 75 of the third embodiment is replaced with a fixed part 77. The attachment 7c is, for example, a crimping attachment in which a pair of objects is sandwiched between the movable part 76 and the fixed part 77 and the pair of objects is bonded to each other by pressure.

[0104] The attachment 7c functions as a crimping attachment by converting the rotational driving force transmitted to the input shaft 71 into a thrust driving force along the rotation axis Ax0 of the rotational driving force. Even when a large force is required to crimp a pair of objects, the objects can be easily crimped by the thrust driving force converted from the impact force generated by the impact mechanism 40.

[0105] The driving force conversion mechanism 9b may be configured to convert the rotational driving force into a thrust driving force along the rotation axis Ax0 of the rotation caused by the rotational driving force, as well as to translate the rotation axis Ax0 or change the angle of the rotation axis Ax0.

[0106] (summary) As described above, the attachment (7) according to the first aspect includes the input shaft (71), the second output shaft (73), and the driving force conversion mechanism (9; 9a; 9b). The input shaft (71) receives the rotational driving force from the first output shaft (450) of the impact rotary tool (1). The second output shaft (73) receives the rotational driving force from the input shaft (71). When transmitting the rotational driving force from the input shaft (71) to the second output shaft (73), the driving force conversion mechanism (9; 9a; 9b) performs at least one of translation of the rotation axis (Ax0) of the rotation caused by the rotational driving force, changing the angle of the rotation axis (Ax0), and conversion of the rotational driving force into a thrust driving force along the rotation axis (Ax0).

[0107] According to this embodiment, since the driving force conversion mechanism (9; 9a; 9b) is provided, it is possible to easily perform work that was difficult to perform with the conventional rotary impact tool (1).

[0108] The attachment (7) according to the second aspect is the same as the attachment (7) of the first aspect, and further includes a housing (70) and an attachment mechanism (8). The housing (70) houses at least a part of the driving force conversion mechanism (9; 9a; 9b). The attachment mechanism (8) attaches and fixes the housing (70) to the tip portion (211) of the impact rotary tool (1).

[0109] According to this embodiment, since the housing (70) is fixed to the tip portion (211) of the impact rotary tool (1) that is relatively close to the attachment (7), it is possible to reduce vibration of the attachment (7) relative to the impact rotary tool (1). In addition, since it is possible to reduce vibration of the attachment (7) relative to the impact rotary tool (1), the driving force conversion in the driving force conversion mechanism (9; 9a; 9b) is less likely to be hindered by vibration.

[0110] In the attachment (7) according to the third embodiment, the mounting mechanism (8) in the second embodiment is attached to a metal part (hammer case 400) of the rotary impact tool (1).

[0111] According to this embodiment, the metal portion (hammer case 400) does not easily chip, so that the attachment (7) can be more firmly fixed to the rotary impact tool (1).

[0112] In the attachment (7) according to the fourth aspect, the impact rotary tool (1) in the third aspect has an impact mechanism (40) and a metal case (hammer case 400). The metal case (hammer case 400) houses at least a part of the impact mechanism (40). The mounting mechanism (8) is attached to the metal case (hammer case 400).

[0113] According to this embodiment, the metal case (hammer case 400) does not easily chip, so that the attachment (7) can be more firmly fixed to the rotary impact tool (1).

[0114] In the attachment (7) according to the fifth aspect, in any one of the second to fourth aspects, the mounting mechanism (8) has a claw portion (81) that is hooked onto the rotary impact tool (1).

[0115] According to this embodiment, the claw portion (81) of the attachment (7) is hooked onto the rotary impact tool (1), so that the attachment (7) can be more firmly fixed to the rotary impact tool (1).

[0116] In the attachment (7) according to the sixth aspect, in the fifth aspect, the claw portion (81) is hooked onto the rotary impact tool (1) by elastic force.

[0117] According to this embodiment, the claw portion (81) of the attachment (7) is hooked onto the rotary impact tool (1) by elastic force, so that the attachment (7) can be more firmly fixed to the rotary impact tool (1).

[0118] The attachment (7) according to a seventh aspect is in any one of the first to sixth aspects, and further includes a connecting shaft (72) that connects the first output shaft (450) and the input shaft (71) and drives integrally with the first output shaft (450) and the input shaft (71). The connecting shaft (72) transmits the rotational driving force of the first output shaft (450) from the first output shaft (450) to the input shaft (71).

[0119] According to this embodiment, the rotational driving force of the first output shaft (450) can be indirectly transmitted to the input shaft (71), thereby increasing the degree of freedom in designing the input shaft (71) and the first output shaft (450).

[0120] In the attachment (7) according to the eighth aspect, in any one of the first to seventh aspects, the rotation axis (Ax1) of the input shaft (71) and the rotation axis (Ax2) of the second output shaft (73) are aligned. The driving force conversion mechanism (9) includes a first gear (91) provided on the input shaft (71) and a second gear (92) provided on the second output shaft (73). When transmitting the rotational driving force from the input shaft (71) to the second output shaft (73), the driving force conversion mechanism (9) directly or indirectly transmits the rotational driving force from the first gear (91) to the second gear (92), thereby performing a parallel movement of the rotation axis (Ax0) of the rotation caused by the rotational driving force.

[0121] According to this aspect, even if the work target is in a localized position, a large tightening torque can be obtained with a small pressing force, making the work easy to perform.

[0122] In the attachment (7a) according to the ninth aspect, in any one of the first to seventh aspects, the rotation axis (Ax1) of the input shaft (71) and the rotation axis (Ax3) of the second output shaft (73) intersect. The driving force conversion mechanism (9a) includes a first gear (91a) provided on the input shaft (71) and a second gear (92a) provided on the second output shaft (73). When transmitting the rotational driving force from the input shaft (71) to the second output shaft (73), the driving force conversion mechanism (9a) directly or indirectly transmits the rotational driving force from the first gear (91a) to the second gear (92a), thereby changing the angle of the rotation axis (Ax0) of the rotation caused by the rotational driving force.

[0123] According to this aspect, even if the work object is at an angle where it is difficult to apply force, a large tightening torque can be obtained with a small pressing force, making the work easy to perform.

[0124] In the attachment (7b; 7c) according to the tenth aspect, in any one of the first to seventh aspects, the input shaft (71) and the second output shaft (73b) are aligned along the rotation axis (Ax0) of rotation caused by the rotational driving force. The driving force conversion mechanism (9b) has a first screw portion (95) provided on the input shaft (71) and a second screw portion (96) provided on the second output shaft (73b) and screwed into the first screw portion (95). When transmitting the rotational driving force from the input shaft (71) to the second output shaft (73), the driving force conversion mechanism (9b) converts the rotational driving force into a thrust driving force by moving the second screw portion (96) and the second output shaft (73) along the rotation axis (Ax0) of rotation caused by the rotational driving force by the rotation of the first screw portion (95) caused by the rotational driving force transmitted to the input shaft (71).

[0125] According to this embodiment, the rotational driving force transmitted to the input shaft (71) is converted into a thrust driving force along the rotation axis (Ax0) of the rotational driving force, thereby making it possible to handle a variety of tasks.

[0126] The configurations other than those of the first aspect are not essential to the attachment (7) and may be omitted as appropriate.

[0127] A tool system (100) according to an eleventh aspect includes an attachment (7; 7a; 7b; 7c) according to any one of the first to tenth aspects, and an impact rotary tool (1) to which the attachment (7; 7a; 7b; 7c) is attached.

[0128] According to this embodiment, since the attachment (7; 7a; 7b; 7c) is provided with the driving force conversion mechanism (9; 9a; 9b), it can easily handle work that was difficult to perform with the conventional rotary impact tool (1). [Explanation of symbols]

[0129] 1. Impact rotary tool 40 Impact mechanism 400 Hammer case (metal case) 450 1st output shaft 63 Fixing mechanism 7,7a,7b,7c Attachments 70 Case 71 Input shaft 72 Connecting shaft 73 Second output shaft 8 Mounting mechanism 81 Claw part 9, 9a, 9b Driving force conversion mechanism 91,91a 1st gear 92,92a 2nd Gear 95 First screw part 96 Second screw part 100 Tool System

Claims

1. an input shaft to which a rotational driving force is transmitted from a first output shaft of the impact rotary tool; a second output shaft to which the rotational driving force is transmitted from the input shaft; a driving force conversion mechanism that performs one of a translation of a rotation axis of rotation caused by the rotational driving force, a change in angle of the rotational shaft, and a conversion from the rotational driving force to a thrust driving force along the rotational shaft when transmitting the rotational driving force from the input shaft to the second output shaft; a housing that accommodates at least a portion of the driving force conversion mechanism; an attachment mechanism that attaches and fixes the housing to a tip portion of the impact rotary tool; Equipped with The impact rotary tool includes: An impact mechanism; a metal case that houses at least a portion of the impact mechanism; The attachment mechanism has a claw portion that is hooked onto the impact rotary tool, The claw portion is caught by the metal case by elastic force, The second output shaft transmits the driving force converted by the driving force converting mechanism to a tool bit. Attachment for impact rotary tools.

2. a connecting shaft that connects the first output shaft and the input shaft and drives the first output shaft and the input shaft integrally, The connecting shaft transmits the rotational driving force of the first output shaft from the first output shaft to the input shaft.

2. The attachment for a rotary impact tool according to claim 1.

3. The rotation shaft of the input shaft and the rotation shaft of the second output shaft are aligned, The driving force conversion mechanism includes: A first gear provided on the input shaft; a second gear provided on the second output shaft; Including, When transmitting the rotational driving force from the input shaft to the second output shaft, the driving force conversion mechanism performs translation of the rotation axis caused by the rotational driving force by directly or indirectly transmitting the rotational driving force from the first gear to the second gear.

3. An attachment for a rotary impact tool according to claim 1 or 2.

4. The rotation axis of the input shaft and the rotation axis of the second output shaft intersect with each other, The driving force conversion mechanism includes: A first gear provided on the input shaft; a second gear provided on the second output shaft; Including, When transmitting the rotational driving force from the input shaft to the second output shaft, the driving force conversion mechanism directly or indirectly transmits the rotational driving force from the first gear to the second gear, thereby changing the angle of the rotation shaft rotated by the rotational driving force.

3. An attachment for a rotary impact tool according to claim 1 or 2.

5. the input shaft and the second output shaft are aligned along the rotation axis of the rotation caused by the rotational driving force, The driving force conversion mechanism includes: a first screw portion provided on the input shaft; a second threaded portion provided on the second output shaft and screwed into the first threaded portion; having When transmitting the rotational driving force from the input shaft to the second output shaft, the driving force conversion mechanism converts the rotational driving force into the thrust driving force by rotating the first threaded portion due to the rotational driving force transmitted to the input shaft, thereby moving the second threaded portion and the second output shaft along the rotation axis of the rotation due to the rotational driving force.

3. An attachment for a rotary impact tool according to claim 1 or 2.

6. An attachment for a rotary impact tool according to any one of claims 1 to 5; The impact rotary tool to which the impact rotary tool attachment is attached; and A tool system comprising:

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