Impact tool

Abstract

The invention provides an impact tool. The impact tool includes: a final output shaft configured to detachably hold a tip tool and define a drive axis of the tip tool; a housing; and a handle configured to be relatively movable with respect to the housing in the axial direction of the drive axis. The housing and the handle at least partially have a shape in which a radial distance between the housing and the handle is smaller when the handle is located at a first relative position farthest from the housing in the axial direction than when the handle is located at a second relative position closer to the housing in the axial direction. Therefore, the vibration in the direction crossed with the axial direction can be reduced, and the use feeling can be improved.

Description

Technical Field

[0001] The present invention relates to an impact tool configured to linearly drive a tip tool. Background Art

[0002] A hammer drill is configured to be able to perform a hammering action of linearly driving a tip tool mounted on a tool holder along a driving axis, and a drilling action of driving the tip tool to rotate about the driving axis. Generally, in order to perform the hammering action, a motion conversion mechanism that converts the rotational motion of an intermediate shaft into a linear motion is adopted, and in order to perform the drilling action, a rotational transmission mechanism that transmits rotation from the intermediate shaft to the tool holder is adopted. When such a hammer drill performs the hammering action, a reaction force against the impact force on the tip tool from the workpiece is received. This reaction force mainly generates vibration in the direction in which the driving axis extends (hereinafter, also referred to as the axial direction). This vibration is transmitted to the housing of the hammer drill and then to the user.

[0003] Hammer drills having a structure for absorbing such vibration in the axial direction are disclosed in Japanese Patent Laid-Open Publication No. 2022-36606 and Japanese Patent Laid-Open Publication No. 2022-128006. Specifically, the handle of the hammer drill is configured to be slidable in the axial direction on a guide member disposed on a motor housing that houses a motor. The handle is biased in the axial direction away from the motor housing by a biasing member. When the tip tool receives a reaction force due to the hammering action, due to this reaction force, the portion other than the handle and the tip tool together overcome the acting force of the biasing member and relatively move rearward with respect to the handle. At this time, the biasing member elastically deforms to buffer a part of the reaction force. By this buffering action, the vibration in the axial direction transmitted to the handle due to the reaction force is reduced.

[0004] In a hammer drill, vibration in a direction intersecting the axial direction is also generated due to the motion conversion mechanism and the driving of the motor. If a gap between the handle and the motor housing is ensured in advance, the transmission of the above vibration to the handle can be reduced by the radial play between the handle and the motor housing. In particular, in Japanese Patent Laid-Open Publication No. 2022-128006, since an elastic member is disposed between the handle and the motor housing, the transmission of vibration in a direction intersecting the axial direction to the handle can be efficiently reduced. Summary of the Invention [Technical Problem to be Solved by the Invention]

[0005] However, if the clearance between the handle and the motor housing is ensured to such an extent that the transmission of vibration in a direction crossing the axial direction to the handle can be sufficiently reduced, when the user holds the hammer drill by hand without pressing the hammer drill against the workpiece, the radial play between the handle and the motor housing is large, and the usability of the hammer drill is poor. Such a problem is not limited to hammer drills, but exists in various impact tools having a drive mechanism for performing a hammering action.

[0006] Accordingly, there is a need to provide an impact tool that reduces vibration in a direction crossing the axial direction while improving usability. [Technical Solution for Solving Technical Problems]

[0007] This specification discloses an impact tool. The impact tool may include: a final output shaft configured to detachably hold a tip tool and define a drive axis of the tip tool; a motor; a drive mechanism configured to be able to perform at least a hammering action of linearly driving the tip tool along the drive axis by the power of the motor; a housing; a handle configured to be able to relatively move in the axial direction of the drive axis with respect to the housing; a biasing member that biases the handle in a direction away from the final output shaft in the axial direction; and at least one guiding member arranged between the housing and the handle so as to extend in the axial direction and configured to slidably guide the relative movement of the handle and the housing. The housing and the handle may at least partially have the following shape: when the handle is in a first relative position farthest from the housing in the axial direction, the radial distance between the housing and the handle is smaller than when the handle is in a second relative position closer to the housing in the axial direction.

[0008] According to this impact tool, in a state where the impact tool (more specifically, the tip tool held by the final output shaft) is not pressed against the workpiece, since the handle is in the first relative position, the radial distance (i.e., clearance) between the housing and the handle is relatively small. Therefore, when the user holds the impact tool by hand in this state, the radial play between the handle and the housing is relatively small, improving the usability of the impact tool. On the other hand, when the impact tool is pressed against the workpiece for processing, the handle is in the second relative position, so the radial distance between the housing and the handle becomes relatively large. Therefore, the transmission of vibration in a direction crossing the axial direction to the handle can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a side view of a hammer drill according to an embodiment, in which the handle is in an initial position relative to the main body housing. Figure 2 is a rear view of the hammer drill. Figure 3 is of the hammer drill Figure 2Longitudinal sectional view of A-A, with the handle in the initial position relative to the main body housing. Figure 4 Is a perspective view of a hammer drill. Figure 5 Is a perspective view of a hammer drill with the handle removed. Figure 6 Is a perspective view of a hammer drill with the handle removed. Figure 7 Is a left view of a hammer drill with the handle removed. Figure 8 Is of the hammer drill Figure 2 Longitudinal sectional view of B-B, with the handle in the initial position relative to the main body housing. Figure 9 Is of the hammer drill Figure 2 Longitudinal sectional view of B-B, with the handle in the closest position relative to the main body housing. Figure 10 Is Figure 8 Partial enlarged view. Figure 11 Is Figure 9 Partial enlarged view. Figure 12 Is a side view showing the left half of the handle. Figure 13 Is a rear view of the hammer drill with a part of the components including the handle removed. [Description of Reference Numerals] 10: Hammer drill; 11: Tip tool; 12: Mode changeover dial; 13: Power cable; 14: Trigger; 15: Switch; 16: Biasing spring; 20: Main body housing; 21: Gear housing; 22: Motor housing; 23: Cylindrical part; 24: Bearing holder; 25: Bellows; 30: Handle; 31: Grip part; 32: Cylindrical part; 40: Spindle; 41: Tool holder; 42: Cylinder; 43: Driven gear; 50: Drive mechanism; 51: Impact mechanism; 52: Motion conversion part; 53: Arm part; 54: Piston; 55: Ram; 56: Impact bolt; 57: Intermediate shaft; 58: Gear; 59: Driving gear; 60: Motor; 61: Motor main body part; 62: Motor shaft; 63: Pinion; 70: Guide part; 71: Elastic part; 91 - 94: Quadrants; 231: First front contact part; 232: First rear contact part; 233: Front stop part; 234: Rear stop part; 321: Second front contact part; 322: Second rear contact part; 323: Front concave part; 324: Rear concave part; 325: Sliding plane; AX1: Drive axis; AX2: Rotation axis. Detailed Description of the Invention

[0010] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the accompanying drawings. This detailed description is only intended to show those skilled in the art the details of the preferred examples for implementing the present invention, and is not intended to limit the scope of the present invention. In addition, the additional features and inventions disclosed hereinafter can be used separately or together with other features and inventions to provide further improved devices, their manufacturing methods and usage methods.

[0011] In addition, the combination of features and processes disclosed in the following detailed description is not necessary in the broadest sense for implementing the present invention, and is only described to specifically illustrate representative specific examples of the present invention. Moreover, when providing additional and useful embodiments of the present invention, the various features of the above and below representative specific examples, and the various features recited in the independent claims and dependent claims do not necessarily have to be combined as in the specific examples described herein or in the order listed.

[0012] Different from the structures of the features recited in the embodiments and / or claims, all features recited in this specification and / or claims are intended to be disclosed separately and independently of each other as limitations on the disclosure content of the original application and the specific matters claimed. Also, regarding all numerical ranges and descriptions of groups or clusters, as limitations on the disclosure content of the original application and the specific matters claimed, the intermediate structures are intended to be disclosed.

[0013] In one or more embodiments, the motor may have a rotational axis extending parallel to the drive axis. The housing may accommodate the motor. The handle may have: a first portion, which is configured at a position radially outside the housing with respect to the rotational axis and extends in the axial direction of the rotational axis; and a second portion, which extends in a direction intersecting the first portion and is configured to be gripped by a user. At least one guiding member may be disposed between the housing and the first portion. According to this impact tool structure, even when the handle is in the first relative position, the radial play between the handle and the housing is relatively small, improving the usability of the impact tool. In addition, when the handle is in the second relative position, the radial distance between the housing and the handle is relatively large, so that the vibration in the direction intersecting the axial direction can be reduced from being transmitted to the handle.

[0014] In one or more embodiments, the impact tool may have at least one elastic component, which is adjacent to at least one guide component and is arranged between at least one guide component and the housing, or between at least one guide component and the handle. According to this structure, when vibration in a direction intersecting the axial direction is generated when the impact tool is used, at least one elastic component elastically deforms in a direction intersecting the axial direction to absorb the vibration. Therefore, the vibration in a direction intersecting the axial direction can be effectively reduced from being transmitted to the handle.

[0015] In one or more embodiments, the housing may have at least one first abutment portion. The handle may have at least one second abutment portion, and the at least one second abutment portion abuts against at least one first abutment portion in a manner that the radial gap is zero (i.e., in a manner that relative displacement in the radial direction is impossible) when the handle is in the first relative position, and does not abut against the first abutment portion when the handle is in the second relative position. According to this structure, when the impact tool is not pressed against the workpiece, the handle is in the first relative position, and at least one first abutment portion of the housing abuts against at least one second abutment portion of the handle in a manner that the radial gap is zero. Therefore, when the impact tool is not pressed against the workpiece, the radial shaking between the handle and the housing can be further reduced, and the usability of the impact tool can be further improved.

[0016] In one or more embodiments, at least one first abutting portion may have at least one first tapered surface extending in a manner that is located radially inward as it approaches the final output shaft. At least one second abutting portion may have at least one second tapered surface extending in a manner that is located radially inward as it approaches the final output shaft, and the at least one second tapered surface can be in surface contact with the at least one first tapered surface. According to this structure, compared with the case where at least one first abutting portion and at least one second abutting portion are surfaces facing the radial direction (in other words, surfaces parallel to the axial direction), when the handle starts to move relative to the housing from the first relative position to the second relative position (that is, when the user presses the impact tool against the workpiece for processing), at least one first abutting portion and at least one second abutting portion are immediately separated, thereby generating a gap in which the handle and the housing can move relative to each other in the radial direction (that is, a gap that can reduce the transmission of vibration in the direction intersecting the axial direction to the handle). Therefore, the vibration-proof performance can be improved. Furthermore, when the handle returns from the second relative position to the first relative position, at least one first contact portion and at least one second contact portion can function as a guide.

[0017] In one or more embodiments, at least one first abutting portion may include: at least one first front abutting portion; and at least one first rear abutting portion, which is separated from the at least one first front abutting portion in the axial direction and is arranged at a position farther from the final output shaft than the at least one first front abutting portion. At least one second abutting portion may include: at least one second front abutting portion, which is configured to abut against the at least one first front abutting portion; and at least one second rear abutting portion, which is separated from the at least one second front abutting portion in the axial direction and is configured to abut against the first rear abutting portion. According to this structure, since at least one first abutting portion and at least one second abutting portion abut against at least two locations separated in the axial direction, when the impact tool is not pressed against the workpiece (i.e., when the handle is in the first relative position), the radial shaking between the handle and the housing can be more stably reduced.

[0018] In one or more embodiments, at least one first abutting portion may include at least three first abutting portions separated in the circumferential direction. According to this structure, since at least one first abutting portion abuts at least one second abutting portion at at least three locations separated in the circumferential direction, the radial shaking between the handle and the housing can be more stably reduced.

[0019] In one or more embodiments, when the direction in which the drive axis extends is defined as the front-to-back direction, the direction orthogonal to the front-to-back direction and substantially consistent with the direction in which the second part of the handle extends is defined as the up-down direction, and the direction orthogonal to the front-to-back direction and the up-down direction is defined as the left-right direction, at least one guide component and at least one first abutment portion may include four sets of guide components and first abutment portions respectively arranged in four quadrants defined by the up-down direction and the left-right direction when the rotation axis is taken as the origin. According to this structure, when the impact tool is not pressed against the workpiece (i.e., when the handle is in the first relative position), at least one first abutment portion abuts at least one second abutment portion at four locations well-balancedly dispersed in each of the four quadrants. Therefore, the radial shaking between the handle and the housing can be further reduced, and the use feeling of the impact tool can be further improved. Moreover, since the guide components are respectively arranged at four locations well-balancedly arranged in each of the four quadrants, the sliding movement of the handle relative to the axial direction of the housing can be smooth. In other words, it is possible to reduce the play in the direction intersecting the axial direction during the relative movement between the handle and the housing in the axial direction.

[0020] In one or more embodiments, the four sets of guide members and the first abutting portion may be configured such that, in the circumferential direction, the distance between adjacent guide members and the first abutting portion is less than the distance between two adjacent guide members. According to this structure, since the distance between the guide member and the first abutting portion is relatively close, when the handle moves away from the first relative position, the radial wobbling between the handle and the housing can be further reduced, and the usability of the impact tool can be further improved.

[0021] In one or more embodiments, the separation distance between at least one second front abutting portion and at least one second rear abutting portion may be 1 / 3 or more of the extension distance of the guide member in the longitudinal direction of the guide member. According to this structure, the separation distance between at least one second front abutting portion and at least one second rear abutting portion in the axial direction can be made relatively large. Therefore, in a state where the impact tool is not pressed against the workpiece (i.e., when the handle is in the first relative position), the radial wobbling between the handle and the housing can be more stably reduced.

[0022] In one or more embodiments, the housing may have at least one rear stop portion continuous with an edge portion on the side opposite to the final output shaft in at least one first conical surface of at least one first rear abutting portion. At least one rear stop portion may be configured to contact the handle when the handle is in the second relative position and the handle is displaced a predetermined amount radially with respect to the housing, thereby restricting the relative radial displacement between the handle and the housing. According to this structure, when the impact tool is pressed against the workpiece for processing (i.e., when the handle is in the second relative position), when the handle is displaced a predetermined amount radially with respect to the housing, further displacement can be prevented by at least one rear stop portion. And since the first rear abutting portion and at least one rear stop portion can be made into an integral structure, the structure of the housing can be simplified.

[0023] In one or more embodiments, the housing may have at least one front stop portion continuous with an edge portion on the side closer to the final output shaft in at least one first conical surface of at least one first front abutting portion. At least one front stop portion may be configured to contact the handle when the handle is in the second relative position and the handle is displaced a predetermined amount radially with respect to the housing, thereby restricting the relative radial displacement between the handle and the housing. According to this structure, when the impact tool is pressed against the workpiece for processing (i.e., when the handle is in the second relative position), when the handle is displaced a predetermined amount radially with respect to the housing, further displacement can be prevented by at least one front stop portion. And since the first front abutting portion and at least one front stop portion can be made into an integral structure, the structure of the housing can be simplified.

[0024] Hereinafter, with reference to the accompanying drawings, the hammer drill 10, which is an example of an impact tool according to an exemplary embodiment, will be described in more detail. In the present embodiment, the hammer drill 10 is exemplified as an example of an impact tool. The hammer drill 10 is a portable electric tool for processing operations such as chiseling operations and drilling operations, and is configured to be able to perform an operation of linearly driving the tip tool 11 along a predetermined drive axis AX1 (hereinafter referred to as a hammering operation), and an operation of driving the tip tool 11 (refer to Figure 3 ) to rotate about the drive axis AX1 (hereinafter referred to as a drilling operation).

[0025] First, mainly with reference to Figure 1 and Figure 3 , the schematic structure of the hammer drill 10 will be briefly described. As shown in Figure 1 , the outer contour of the hammer drill 10 is mainly formed by a main body housing 20 and a handle 30 connected to the main body housing 20.

[0026] The main body housing 20 is a hollow body for housing a main shaft 40, a drive mechanism 50, a motor 60, etc. The main shaft 40 is an elongated cylindrical member, and a tool holder 41 for detachably holding the tip tool 11 is provided at one end in the axial direction thereof. The long axis of the main shaft 40 defines the drive axis AX1 of the tip tool 11. The main body housing 20 extends along the drive axis AX1. The tool holder 41 is disposed inside one end in the extending direction of the drive axis AX1 of the main body housing 20 (hereinafter also simply referred to as the axial direction).

[0027] The handle 30 is disposed on one side in the axial direction of the main body housing 20 (the side opposite to the side where the main shaft 40 is disposed). The handle 30 has a grip portion 31 extending in a direction intersecting the drive axis AX1 (specifically, a substantially orthogonal direction). The grip portion 31 is a portion for being gripped by the user and is formed to protrude in a direction intersecting the drive axis AX1.

[0028] In the following description, for the sake of convenience, the extending direction of the drive axis AX1 (the long axis direction of the main body housing 20) is defined as the front-rear direction of the hammer drill 10. In the front-rear direction, the side where the main shaft 40 is disposed is defined as the front side of the hammer drill 10, and the opposite side (the side where the motor 60 is disposed) is defined as the rear side of the hammer drill 10. In addition, the direction orthogonal to the drive axis AX1 and substantially coinciding with the extending direction of the grip portion 31 is defined as the up-down direction of the hammer drill 10. In the up-down direction, the side where the main body housing 20 is located is defined as the upper side of the hammer drill 10, and the protruding end side of the grip portion 31 is defined as the lower side of the hammer drill 10. In addition, the direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction of the hammer drill 10. In the left-right direction, the right side when observing the front side from the rear side is defined as the right side of the hammer drill 10, and the opposite side is defined as the left side of the hammer drill 10.

[0029] Hereinafter, the detailed structure of the hammer drill 10 will be described. As Figure 3 shown, the main body housing 20 has a gear housing 21 and a motor housing 22. A main shaft 40 and a drive mechanism 50 are accommodated in the gear housing 21.

[0030] A motor 60 is accommodated in the motor housing 22. The motor housing 22 is disposed adjacent to the gear housing 21 at the rear side of the gear housing 21. The motor housing 22 is a single component and has a cylindrical portion 23 and a bearing holding portion 24.

[0031] The cylindrical portion 23 is a cylindrical portion extending in the axial direction. More specifically, the cylindrical portion 23 has a front end portion and a rear side portion, and the rear side portion is located at a position behind the front end portion. The front end portion of the cylindrical portion 23 has substantially the same thickness as the rear end portion of the gear housing 21 (in other words, the dimension around the drive axis AX1). The rear side portion has an outer diameter smaller than that of the front end portion of the cylindrical portion 23. The bearing holding portion 24 projects rearward from the rear end surface of the cylindrical portion 23 and has an outer diameter smaller than that of the rear half portion of the cylindrical portion 23.

[0032] As Figure 3 shown, the motor 60 has: a motor main body portion 61 having a stator and a rotor; and a motor shaft 62 configured to rotate integrally with the rotor. The motor main body portion 61 is accommodated in the cylindrical portion 23 (more specifically, in the rear side portion of the cylindrical portion 23). The rotation axis AX2 of the motor 60 (motor shaft 62) extends in parallel with the drive axis AX1 at a position below the drive axis. The motor shaft 62 is supported by two bearings so as to be rotatable about the rotation axis AX2. The front end portion of the motor shaft 62 extends into the gear housing 21. A pinion 63 is formed on the portion protruding into the gear housing 21.

[0033] The main shaft 40 is the final output shaft of the hammer drill 10. As Figure 3 shown, the main shaft 40 is disposed in the gear housing 21 along the drive axis AX1 and is supported by two bearings so as to be rotatable about the drive axis AX1 relative to the main body housing 20. The main shaft 40 is configured as an elongated stepped cylindrical member.

[0034] The front half portion of the main shaft 40 constitutes a tool holder 41 for detachably holding the tip tool 11. The tip tool 11 is inserted into the front end portion of the tool holder 41 with its long axis aligned with the drive axis AX1. The tip tool 11 is held by the tool holder 41 in a state allowing movement in the axial direction relative to the tool holder 41 and restricting rotation about the axis. The rear half portion of the main shaft 40 constitutes a cylinder 42 for slidably holding a piston 54 described later.

[0035] In the present embodiment, the drive mechanism 50 is configured to be able to perform a hammering action of linearly driving the tip tool 11 along the drive axis AX1 and a drilling action of driving the tip tool 11 to rotate about the drive axis AX1 by the power of the motor 60.

[0036] Specifically, the drive mechanism 50 includes an impact mechanism 51 for performing the hammering action. The impact mechanism 51 has a motion conversion member 52, an arm portion 53, a piston 54, a ram 55, and a striker 56. The motion conversion member 52 is disposed around the intermediate shaft 57. The intermediate shaft 57 extends in parallel with the rotation axis AX2 of the motor shaft 62. The intermediate shaft 57 is rotatably supported by two bearings. The rotational force of the motor shaft 62 is transmitted to the intermediate shaft 57 through a gear 58 that meshes with a pinion 63 formed at the front end of the motor shaft 62. The motion conversion member 52 is configured to swing in the front-rear direction as the intermediate shaft 57 rotates. The arm portion 53 connects the motion conversion member 52 and the piston 54. The rotational motion of the intermediate shaft 57 is converted into a linear motion by the motion conversion member 52 and transmitted to the piston 54 through the arm portion 53.

[0037] The piston 54 is a bottomed cylindrical member and is disposed in the cylinder 42 of the main shaft 40 so as to be slidable along the drive axis AX1. The ram 55 is disposed in the piston 54 so as to be slidable along the drive axis AX1. The internal space of the piston 54 at the rear side of the ram 55 is defined as an air chamber that functions as an air spring. The striker 56 is an intermediate member that transmits the kinetic energy of the ram 55 to the tip tool 11. The striker 56 is disposed in the tool holder 41 so as to be movable along the drive axis AX1 on the front side of the ram 55.

[0038] As described above, when the rotational motion of the intermediate shaft 57 is converted into a linear motion and transmitted to the piston 54, the piston 54 moves in the front-rear direction. At this time, the pressure of the air in the air chamber changes, and the ram 55 slides in the piston 54 in the front-rear direction under the action of the air spring. More specifically, when the piston 54 moves forward, the air in the air chamber is compressed and the internal pressure rises. The ram 55 is pushed forward at high speed under the action of the air spring and impacts the striker 56. The striker 56 transmits the kinetic energy of the ram 55 to the tip tool 11. Accordingly, the tip tool 11 is linearly driven along the drive axis AX1. On the other hand, when the piston 54 moves backward, the air in the air chamber expands and the internal pressure drops, and the ram 55 is pulled backward. The tip tool 11 moves backward together with the striker 56 by being pressed against the workpiece. In this way, the hammering action is repeatedly performed by the impact mechanism 51.

[0039] Further, the drive mechanism 50 has a rotation transmission mechanism for performing a drilling operation. The rotation transmission mechanism has a drive gear 59 and is configured to transmit the rotational movement of the intermediate shaft 57 to the main shaft 40, thereby driving the tip tool 11 to rotate about the drive axis AX1. More specifically, the drive gear 59 is fixed to the front end portion of the intermediate shaft 57. The drive gear 59 meshes with a driven gear 43 provided on the outer periphery of the cylinder 42 fixed to the main shaft 40. Therefore, as the drive gear 59 rotates integrally with the intermediate shaft 57, the main shaft 40 rotates integrally with the driven gear 43. Accordingly, a drilling operation is performed to drive the tip tool 11 held by the tool holder 41 to rotate about the drive axis AX1.

[0040] In the present embodiment, the hammer drill 10 has three operation modes that can be selectively performed, namely, a hammer drill mode, a hammering mode, and a drilling mode. The hammer drill mode is an operation mode in which both the impact mechanism 51 and the rotation transmission mechanism are driven to perform a hammering operation and a drilling operation. The hammering mode is an operation mode in which the power transmission for performing the drilling operation is cut off, and only the impact mechanism 51 is driven, thereby only performing a hammering operation. The drilling mode is an operation mode in which the power transmission for performing the hammering operation is cut off, and only the rotation transmission mechanism is driven, thereby only performing a drilling operation. These operation modes are switched by operating the mode switching dial 12. Such an operation mode switching mechanism is well-known, and thus its description is omitted.

[0041] The above-described drive mechanism 50 is described, for example, in U.S. Patent Application Publication No. 2015 / 144366 and U.S. Patent Application Publication No. 2016 / 136801. The disclosures of U.S. Patent Application Publication No. 2015 / 144366 and U.S. Patent Application Publication No. 2016 / 136801 are incorporated herein by reference in their entireties.

[0042] As Figures 1 - 3 shown, the handle 30 has a grip portion 31 and a cylindrical portion 32. The cylindrical portion 32 is a cylindrical portion extending in the front-rear direction. As Figure 2 shown, the cylindrical portion 32 is disposed at a position radially outside the motor housing 22 with respect to the rotation axis AX2 so as to surround the motor housing 22 in the circumferential direction. The grip portion 31 is a hollow body that extends in a long strip shape from the rear end of the cylindrical portion 32 in a direction intersecting the rotation axis AX2. In the present embodiment, the front side portion of the cylindrical portion 32 and the grip portion 31 are integrally formed. The handle 30 is formed by fastening left and right split bodies with screws.

[0043] A power cable 13 that can be connected to an external AC power supply extends from the lower end of the handle portion 31. A trigger 14 for a user to perform a pressing operation (triggering operation) is installed on the handle portion 31. A switch 15 is disposed within the handle portion 31, and the switch 15 becomes in an on state in response to the pressing operation of the trigger 14. In the hammer drill 10, when the switch 15 becomes in an on state, the motor 60 is energized and the drive mechanism 50 is driven, thereby performing a hammering action and / or a drilling action.

[0044] In the present embodiment, the main body housing 20 and the handle 30 are connected by a telescopic bellows 25. More specifically, as Figure 4 and Figure 5 shown, the bellows 25 is formed in an annular shape that circumferentially surrounds the rotation axis AX2. The front end of the bellows 25 is connected to the motor housing 22, and the rear end of the bellows 25 is connected to the cylindrical portion 32 of the handle 30. Through the bellows 25, it is possible to prevent dust from entering the interior of the hammer drill 10 from the gap between the main body housing 20 and the handle 30.

[0045] In addition, in the present embodiment, the hammer drill 10 is configured to be able to suppress the vibration generated with the driving of the motor 60 and the drive mechanism 50 from being transmitted to the handle 30. Hereinafter, the vibration-proof structure of the hammer drill 10 will be described.

[0046] As the vibration-proof structure, it is configured such that the main body housing 20 and the handle 30 can relatively move in the front-rear direction. This relative movement is slidably guided by four guide members 70 disposed between the main body housing 20 (more specifically, the motor housing 22) and the handle 30 (more specifically, the cylindrical portion 32) and extending in the front-rear direction. In the present embodiment, the guide members 70 are installed on the motor housing 22 (more specifically, the cylindrical portion 23) via elastic members 71. Specifically, as Figures 5 - 7 shown, the elastic members 71 are fixed to the cylindrical portion 23 of the motor housing 22, and further, the guide members 70 are fixed thereto (i.e., the surface of the elastic member 71 on the side opposite to the cylindrical portion 23). In the present embodiment, the fixing between the elastic member 71, the guide member 70, and the cylindrical portion 23 uses an adhesive. However, any fixing method can be used instead of the adhesive.

[0047] When the main body housing 20 and the handle 30 relatively move in the front-rear direction, the handle 30 slides on the guide members 70. More specifically, as Figure 12 shown, the handle 30 has a sliding plane 325 on its inner side. The sliding plane 325 is oriented parallel to the radially outer surface of the guide member 70. Through the sliding of the sliding plane 325 on the guide member 70, the relative movement of the main body housing 20 and the handle 30 in the front-rear direction is achieved. The guide member 70 extends longitudinally in the front-rear direction, and its length direction is consistent with the front-rear direction. As Figure 7As shown, the guiding member 70 extends substantially over the entire length of the cylindrical portion 23 in the front-rear direction. By ensuring that the length of the guiding member 70 is as long as possible in this way, stable sliding between the main body housing 20 and the handle 30 can be achieved. In the present embodiment, the guiding member 70 is made of metal, but it can also be formed of other materials (e.g., hard resin). Additionally, in the present embodiment, the guiding member 70 is in the form of sheet metal, but the form of the guiding member 70 can also be deformed into any form (e.g., the form of a pin with a circular cross-section).

[0048] In the present embodiment, the elastic member 71 is a sponge, i.e., a resin formed by foaming (e.g., polyurethane). However, the elastic member 71 is not limited to a sponge and can also be any elastic member that can elastically deform in a direction intersecting the front-rear direction (hereinafter also referred to as the intersecting direction). For example, the elastic member 71 can be formed of a soft resin such as silicone resin or polyurethane. The elastic member 71 is arranged between the guiding member 70 and the motor housing 22 (cylindrical portion 23) in an uncompressed state. Therefore, when a force is applied in a direction intersecting the rotation axis AX2, the elastic member 71 can elastically deform (be flattened) in the radial direction of the rotation axis AX2 of the motor shaft 62. In an alternative embodiment, the elastic member 71 can be arranged in a state where it is slightly compressed by being pressed radially by the handle 30 (cylindrical portion 32).

[0049] As Figure 5 , 6 As shown in FIGS. 13, four sets of guiding members 70 and elastic members 71 are arranged separately from each other in the circumferential direction of the rotation axis AX2. In this way, by dispersedly arranging the guiding members 70 in the circumferential direction, smoother sliding performance can be obtained, and the wobbling of the handle 30 relative to the rotation axis AX2 during sliding can be reduced.

[0050] In a structure where the handle 30 can relatively move in the front-rear direction with respect to the main body housing 20, the handle 30 is always biased towards the rear side (in other words, the direction away from the main shaft 40 in the front-rear direction). More specifically, as Figures 5 - 7 shown, the hammer drill 10 has three biasing springs 16. In the present embodiment, the biasing springs 16 are in the form of helical springs and are arranged in a compressed state between the cylindrical portion 23 and the cylindrical portion 32. The three biasing springs 16 are arranged at equal intervals in the circumferential direction of the rotation axis AX2. Therefore, the biasing springs 16 can uniformly apply a force to the handle 30 in a plane orthogonal to the rotation axis AX2.

[0051] With such a structure, in the hammer drill 10, the handle 30 can be in the Figure 1 , 3 initial positions shown in FIGS. 8 and Figure 9The closest positions shown move relative to each other in the front-rear direction with respect to the main body housing 20. The initial position refers to the relative position of the handle 30 in a state where no force in the front-rear direction acts on the main body housing 20 and the handle 30 (in other words, a state where the tip tool 11 held at the tip of the main shaft 40 is not pressed against the workpiece). In the initial position, the handle 30 is located at the position farthest from the main body housing 20 (motor housing 22) in the front-rear direction (i.e., most separated from the main body housing 20). The closest position refers to the relative position of the handle 30 in a state where a rearward force acts on the main body housing 20 and the main body housing 20 and the handle 30 are closest to each other in the front-rear direction. The respective positions of the initial position and the closest position are defined by the abutting portions (not shown) provided on the motor housing 22 and the handle 30 abutting against each other.

[0052] According to the hammer drill 10 described above, when the tip tool 11 receives a rearward reaction force due to the hammering action, the main shaft 40 holding the tip tool 11 and the main body housing 20 supporting the drive mechanism 50 also receive a rearward reaction force. Accordingly, the handle 30 can move relative to the main body housing 20 between the initial position and the closest position. That is, the main body housing 20 and the handle 30 are slidably guided by the guide member 70 and relatively move in the front-rear direction while overcoming the acting force of the biasing spring 16 in a manner that the handle 30 approaches the main shaft 40. By the elastic deformation of the biasing spring 16 at this time, a part of the reaction force is buffered. Through this buffering action, the transmission of the front-rear vibration generated by the reaction force to the handle 30 is reduced.

[0053] Moreover, according to the hammer drill 10, when vibration in the cross direction is generated due to the driving of the motion conversion member 52 and the motor 60, the elastic member 71 disposed between the motor housing 22 and the cylindrical portion 32 of the handle 30 elastically deforms in the direction of the vibration, thereby absorbing the vibration. Therefore, the transmission of the vibration in the cross direction to the handle 30 can also be reduced. And, in the present embodiment, a sponge having a property of being easily deformable is used as the elastic member 71. Therefore, a large elastic deformation amount of the elastic member 71 in the cross direction can be ensured. As a result, the effect of reducing the transmission of the vibration in the cross direction to the handle 30 is improved.

[0054] Moreover, the elastic members 71 are arranged at four positions along the circumferential direction, and the elastic members 71 at different circumferential positions elastically deform in mutually different directions. Therefore, the effect of reducing the transmission of the vibration in the cross direction to the handle 30 is improved.

[0055] The hammer drill 10 has a structure that can obtain the effect of reducing the transmission of the vibration in such a cross direction to the handle 30 while being able to satisfactorily ensure the usability of the hammer drill 10. Hereinafter, such a structure will be described.

[0056] AsFigures 5 - 7 As shown, the cylindrical portion 23 of the motor housing 22 has four sets of first front abutting portions 231, first rear abutting portions 232, front stoppers 233, and rear stoppers 234 on its outer surface. These four combinations are separately arranged at intervals in the circumferential direction of the rotation axis AX2. In each combination, the first front abutting portion 231, the first rear abutting portion 232, the front stopper 233, and the rear stopper 234 are arranged in a straight line in the front-rear direction.

[0057] As is most clearly seen from Figure 11 in the present embodiment, the first front abutting portion 231 and the first rear abutting portion 232 are each in the form of a conical surface that approaches the rotation axis AX2 more as it goes forward (in other words, as it gets closer to the main shaft 40). In other words, this conical surface extends so as to be more radially inward as it goes forward. In the present embodiment, the front stopper 233 is a planar portion continuous with the front edge of the first front abutting portion 231. Further, in the present embodiment, the rear stopper 234 is a planar portion continuous with the rear edge of the first rear abutting portion 232.

[0058] As Figure 11 and Figure 12 shown, the cylindrical portion 32 of the handle 30 has four sets of second front abutting portions 321, second rear abutting portions 322, front recesses 323, and rear recesses 324 on its inner side (only two sets on the left side can be seen in Figure 12 ). These four combinations are separately arranged at intervals in the circumferential direction of the rotation axis AX2. The circumferential positions of the four sets of second front abutting portions 321, second rear abutting portions 322, front recesses 323, and rear recesses 324 coincide with the circumferential positions of the four sets of first front abutting portions 231, first rear abutting portions 232, front stoppers 233, and rear stoppers 234, respectively. In each combination of the cylindrical portion 32, the second front abutting portion 321, the second rear abutting portion 322, the front recess 323, and the rear recess 324 are arranged in a straight line in the front-rear direction.

[0059] As is most clearly seen from Figure 11 in the present embodiment, the second front abutting portion 321 and the second rear abutting portion 322 are each in the form of a conical surface that approaches the rotation axis AX2 more as it goes forward (in other words, as it gets closer to the main shaft 40). In other words, this conical surface extends so as to be more radially inward as it goes forward. The inclination angles of the second front abutting portion 321 and the second rear abutting portion 322 in the form of conical surfaces are equal to the inclination angles of the first front abutting portion 231 and the first rear abutting portion 232 in the form of conical surfaces. The front recess 323 is a planar surface continuous with the rear edge of the second front abutting portion 321 in the form of a conical surface. The rear recess 324 is a planar surface continuous with the rear edge of the second rear abutting portion 322 in the form of a conical surface.

[0060] As Figure 8 and Figure 10 shown, when the handle 30 is in the initial position relative to the main body housing 20, the four first front abutting portions 231 and the four second front abutting portions 321 abut against each other respectively. In this state, the radial gap between the first front abutting portion 231 and the second front abutting portion 321 is zero. Similarly, the four first rear abutting portions 232 and the four second rear abutting portions 322 abut against each other respectively (in other words, the conical surfaces are in surface contact with each other). In this state, the radial gap between the first rear abutting portion 232 and the second rear abutting portion 322 is zero.

[0061] In such an abutting state, the handle 30 cannot be displaced radially relative to the main body housing 20. Therefore, when the user holds the hammer drill 10 by hand in this state, radial wobbling between the handle 30 and the main body housing 20 can be suppressed. As a result, the usability of the hammer drill 10 is improved.

[0062] In particular, in the present embodiment, since the abutting state is established at two positions separated in the front-rear direction, radial wobbling can be reduced more stably. However, the abutting state may be established at only one position. That is, either the combination of the first front abutting portion 231 and the second front abutting portion 321 or the combination of the first rear abutting portion 232 and the second rear abutting portion 322 can be omitted.

[0063] Moreover, in the present embodiment, since the abutting state is established at four positions separated in the circumferential direction, radial wobbling can be reduced more stably. However, the shapes of the motor housing 22 and the cylindrical portion 32 may be changed so that the abutting state is established at only one position, two positions, or three positions, or at five or more positions. If the abutting state is established at at least three or more positions, radial wobbling can be significantly reduced.

[0064] On the other hand, when the tip tool 11 is pressed against the workpiece in order to perform machining with the hammer drill 10, the handle 30 starts to move relative to the main body housing 20 from the initial position toward the closest position. Accordingly, for example, as Figure 9 and Figure 11 shown, the four first front abutting portions 231 and the four second front abutting portions 321 are separated from each other respectively, and the handle 30 can be displaced radially relative to the main body housing 20. As a result, when vibration in the cross direction (a direction crossing the front-rear direction) occurs, the elastic member 71 elastically deforms in the direction crossing the front-rear direction as described above, thereby reducing the transmission of the vibration in the cross direction to the handle 30.

[0065] In addition, in the present embodiment, in a state where the tip tool 11 is pressed against the workpiece, if the handle 30 is displaced by a predetermined amount in the radial direction with respect to the main body housing 20, the front side stopper portion 233 comes into surface contact with the front side stopper portion 325 of the handle 30, and the rear side stopper portion 234 comes into surface contact with the rear side concave portion 324. Accordingly, relative displacement between the handle 30 and the main body housing 20 in the radial direction can be restricted. With this structure, relative displacement between the handle 30 and the main body housing 20 in the radial direction can be restricted before reaching the elastic deformation limit of the elastic member 71. Therefore, excessive wobbling in the radial direction between the handle 30 and the main body housing 20 can be suppressed. As a result, the usability of the hammer drill 10 is improved.

[0066] In the present embodiment, since the above-described abutting state is established by the conical surfaces, when the handle 30 starts to relatively move from the initial position toward the closest position with respect to the main body housing 20 (that is, when the user starts to press the tip tool 11 against the workpiece for machining), the four first front side abutting portions 231 and the four second front side abutting portions 321 are immediately separated, thereby creating a gap (a gap for generating the above-described anti-vibration effect) in which the handle 30 and the main body housing 20 can relatively move in the radial direction. Therefore, anti-vibration performance can be improved. Moreover, when the handle 30 returns to the initial position, the first front side abutting portion 231 and the four second front side abutting portions 321 of the conical surface method can function as guides.

[0067] In the present embodiment, since surface contact is established at two locations separated in the front-rear direction, wobbling in the radial direction can be more stably reduced. However, surface contact may be established at only one location. Alternatively, the shapes of the motor housing 22 and the cylindrical portion 32 may be changed so that surface contact is established at three or more locations. Further, the shapes of the motor housing 22 and the cylindrical portion 32 may be changed so that the motor housing 22 and the cylindrical portion 32 are in line contact or point contact instead of surface contact.

[0068] Moreover, in the present embodiment, since surface contact is established at four locations separated in the circumferential direction, wobbling in the radial direction can be more stably reduced. However, the shapes of the motor housing 22 and the cylindrical portion 32 may be changed so that surface contact is established at only one location, two locations, or three locations, or at five or more locations. If surface contact is established at at least three or more locations, wobbling in the radial direction can be significantly reduced.

[0069] Moreover, in the present embodiment, the first rear contact portion 232 and the rear stopper portion 234 are formed as a continuous integral structure with each other, whereby the shape of the cylindrical portion 23 can be simplified. Similarly, the first front contact portion 231 and the front stopper portion 233 are formed as a continuous integral structure with each other, whereby the shape of the cylindrical portion 23 can be simplified. However, the first rear contact portion 232 and the rear stopper portion 234 may be separated from each other. Similarly, the first front contact portion 231 and the front stopper portion 233 may be separated from each other.

[0070] As Figure 13 shown, when four quadrants 91 to 94 defined by the vertical direction and the horizontal direction are set with the rotation axis AX2 as the origin, as Figures 5 - 7 , 13 shows, the combinations of the guide members 70 and the contact portions (the first front contact portion 231 and the first rear contact portion 232) are respectively arranged in the quadrants 91 to 94. Therefore, in a state where the tip tool 11 is not pressed against the workpiece (that is, when the handle 30 is in the initial position), the first front contact portion 231 and the second front contact portion 321, and the first rear contact portion 232 and the second rear contact portion 322 are in contact with four portions in each of the four quadrants 91 to 94 that are well-balanced and dispersed. Therefore, the radial wobbling between the handle 30 and the motor housing 22 can be further reduced, and the usability of the hammer drill 10 is further improved. Further, in the present embodiment, the distances between the adjacent guide members 70 and the first contact portions (the first front contact portion 231 and the first rear contact portion 232) are respectively configured to be smaller than the distances between the two adjacent guide members 70. According to this structure, since the distances between the guide members 70 and the first contact portions are relatively close, when the handle 30 moves away from the first relative position, the radial wobbling between the handle 30 and the motor housing 22 can be further reduced, and the usability of the hammer drill 10 is further improved.

[0071] And, as Figures 5 - 7, as shown in Fig. 13, the combinations of the stopper portions (the front stopper portion 233 and the rear stopper portion 234) and the elastic member 71 are respectively arranged in quadrants 91 to 94. Moreover, the four sets of stopper portions and the elastic member 71 are arranged such that, in the circumferential direction of the rotation axis AX2, the distances between the front stopper portion 233 adjacent to the elastic member 71 and the elastic member 71, and between the rear stopper portion 234 adjacent to the elastic member 71 and the elastic member 71 are respectively smaller than the distances between two adjacent front stopper portions 233 and between the rear stopper portions 234. Therefore, since the distance between the elastic member 71 and the stopper portions 233, 234 (which restrict the relative displacement of the handle 30 and the main body housing 20 in the radial direction) is relatively close, it is easy to restrict the elastic deformation amount of the elastic member 71 in the radial direction. Moreover, since the elastic member 71 and the stopper portions 233, 234 are respectively arranged at four positions in each of the four quadrants 91 to 94 that are well-balanced and dispersed, even if the handle 30 is displaced in any direction in the radial direction relative to the main body housing 20, the displacement amounts can be equalized. Therefore, when the tip tool 11 is pressed against the workpiece for machining, the radial wobbling between the handle 30 and the main body housing 20 can be more stably reduced, and the usability of the hammer drill 10 can be improved.

[0072] And, in the present embodiment, as Figure 7 shown, the separation distance L2 between the first front abutting portion 231 and the first rear abutting portion 232 is set to be 1 / 3 or more of the extension distance L1 in the front-rear direction of the guide member 70. Therefore, the separation distance between the first front abutting portion 231 and the first rear abutting portion 232 in the front-rear direction can be made relatively large. Therefore, in a state where the tip tool 11 is not pressed against the workpiece (i.e., when the handle 30 is in the initial position), the radial wobbling between the handle 30 and the motor housing 22 can be more stably reduced.

[0073] The correspondence between each structural element of the above-described embodiment and each structural element of the present invention is shown below. However, each structural element of the embodiment is merely an example and does not limit each structural element of the present invention. The hammer drill 10 is an example of an "impact tool". The tip tool 11 is an example of a "tip tool". The main shaft 40 is an example of a "final output shaft". The drive axis AX1 is an example of a "drive axis". The motor 60 is an example of a "motor". The rotation axis AX2 is an example of a "rotation axis". The drive mechanism 50 is an example of a "drive mechanism". The motor housing 22 is an example of a "housing". The handle 30 is an example of a "handle". The cylinder portion 32 is an example of a "first part". The grip portion 31 is an example of a "second part". The biasing spring 16 is an example of a "biasing member". The guide member 70 is an example of "at least one guide member". The elastic member 71 is an example of "at least one elastic member". The first front contact portion 231 and the first rear contact portion 232 are examples of "at least one first contact portion". The second front contact portion 321 and the second rear contact portion 322 are examples of "at least one second contact portion". The first front contact portion 231 is an example of a "first front contact portion". The first rear contact portion 232 is an example of a "first rear contact portion". The second front contact portion 321 is an example of a "second front contact portion". The second rear contact portion 322 is an example of a "second rear contact portion". The front stopper 233 and the rear stopper 234 are examples of "stopper portions". The front stopper 233 is an example of a "front stopper portion". The rear stopper 234 is an example of a "rear stopper portion". The initial position is an example of a "first relative position". Any position between the initial position and the closest position, and the closest position are examples of a "second relative position".

[0074] As described above, several embodiments have been described. However, the above-described embodiments are for the purpose of making the present teachings easy to understand and do not limit the present invention. The present invention can be changed and improved without departing from its gist, and the present invention includes its equivalents. In addition, within the range of being able to solve at least a part of the above technical problems, or within the range of achieving at least a part of the effects, any combination or omission of the technical solutions and each mode element described in the specification can be made.

[0075] For example, the guide member 70 and the elastic member 71 may be fixed to the handle 30 instead of being fixed to the motor housing 22. In this structure, the elastic member 71 is fixed to the inner surface of the handle 30, and the guide member 70 is fixed to the elastic member 71 in such a manner that the elastic member 71 is located between the handle 30 and the guide member 70. In addition, the motor housing 22 slides on the guide member 70.

[0076] Alternatively, the elastic member 71 may be omitted. In this case, the guide member 70 may be directly fixed to the motor housing 22 or the handle 30. This structure can also reduce the transmission of vibration in a direction intersecting the axial direction caused by the gap between the main housing 20 and the handle 30 to the handle.

[0077] Alternatively, the motor housing 22 (more specifically, the barrel 23) and the handle 30 (more specifically, the barrel 32) may be deformed into any form that at least partially has the following shape, which is a shape in which the radial distance between the motor housing 22 (barrel 23) and the handle 30 (barrel 32) is smaller when the handle 30 is in the initial position than when the handle 30 is in a relative position closer to the front side than the initial position. According to such a deformation, even in a state where the top tool 11 is not pressed against the workpiece, the radial distance between the motor housing 22 and the handle 30 is relatively reduced. Therefore, when the user holds the hammer drill 10 by hand in this state, the radial shaking between the handle 30 and the main housing 20 is relatively reduced, and the use feeling of the hammer drill 10 is improved.

[0078] Alternatively, the number of guide members 70 and elastic members 71 may be arbitrarily set. For example, the guide members 70 and elastic members 71 may be arranged at three locations along the circumferential direction similarly to the biasing springs 16 .

[0079] In the above-mentioned embodiment, the relative movement between the main housing 20 and the handle 30 and the above-mentioned vibration-proof structure are realized by arranging the guide member 70, the first front abutting portion 231, the first rear abutting portion 232, the front stopper 233 and the rear stopper 234 at the motor housing 22. However, these structural components may be arranged at any position of the main housing according to the layout of the hammer drill (for example, the layout of structural components corresponding to the drive mechanism 50 and the motor 60). For example, these structural components may be arranged at a housing that accommodates the drive mechanism, or a housing that accommodates the drive mechanism and the motor, instead of the motor housing 22 that accommodates the motor 60.

[0080] In the above embodiment, the hammer drill 10 capable of performing both hammering and drilling operations is exemplified as an example of the impact tool. However, the impact tool may be an electric hammer capable of performing only hammering operations.

Claims

1. An impact tool, characterized in that, it has a final output shaft, a motor, a drive mechanism, a housing, a handle, a biasing member, and at least one guiding member, wherein, the final output shaft is configured to detachably hold a tip tool and defines a drive axis of the tip tool; the drive mechanism is configured to be able to perform at least a hammering action of linearly driving the tip tool along the drive axis by the power of the motor; the handle is configured to be able to move relative to the housing in the axial direction of the drive axis; the biasing member biases the handle in a direction away from the final output shaft in the axial direction; the at least one guiding member is disposed between the housing and the handle so as to extend in the axial direction, and is configured to slidably guide the relative movement between the handle and the housing; the housing and the handle at least partially have the following shape: when the handle is in a first relative position farthest from the housing in the axial direction, the radial distance between the housing and the handle is smaller than when the handle is in a second relative position closer to the housing in the axial direction.

2. The impact tool according to claim 1, characterized in that, the motor has a rotation axis extending parallel to the drive axis; the housing houses the motor; the handle has: a first portion, which is disposed at a position radially outside the rotation axis relative to the housing and extends in the axial direction of the rotation axis; and a second portion, which extends in a direction intersecting with the first portion so as to be graspable by a user; the at least one guiding member is disposed between the housing and the first portion.

3. The impact tool according to claim 1 or claim 2, characterized in that, it has at least one elastic member, which is adjacent to the at least one guiding member and is disposed between the at least one guiding member and the housing, or between the at least one guiding member and the handle.

4. The impact tool according to any one of claims 1 to 3, characterized in that, the housing has at least one first abutting portion; the handle has at least one second abutting portion, and the at least one second abutting portion abuts against the at least one first abutting portion with a zero radial gap when the handle is in the first relative position, and does not abut against the first abutting portion when the handle is in the second relative position.

5. The impact tool according to claim 4, characterized in that, the at least one first abutting portion has at least one first tapered surface extending in such a manner that it is located more radially inward as it approaches the final output shaft; the at least one second abutting portion has at least one second tapered surface extending in such a manner that it is located more radially inward as it approaches the final output shaft, and the at least one second tapered surface can be in surface contact with the at least one first tapered surface.

6. The impact tool according to claim 4 or claim 5, characterized in that, The at least one first abutting portion has: at least one first front abutting portion; and at least one first rear abutting portion, which is separated from the at least one first front abutting portion in the axial direction and is disposed at a position farther from the final output shaft than the at least one first front abutting portion. The at least one second abutting portion has: at least one second front abutting portion configured to abut against the at least one first front abutting portion; and at least one second rear abutting portion, which is separated from the at least one second front abutting portion in the axial direction and is configured to abut against the first rear abutting portion.

7. The impact tool according to any one of claims 4 to 6, characterized in that The at least one first abutting portion includes at least three first abutting portions separated from each other circumferentially.

8. The impact tool according to any one of claims 4 to 7, which depends on claim 2, characterized in that When the direction in which the drive axis extends is defined as the front-rear direction, the direction orthogonal to the front-rear direction and substantially coinciding with the direction in which the second part of the handle extends is defined as the up-down direction, and the direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction, the at least one guiding member and the at least one first abutting portion include four sets of guiding members and first abutting portions respectively disposed in four quadrants defined by the up-down direction and the left-right direction with the rotation axis as the origin.

9. The impact tool according to claim 8, characterized in that The four sets of the guiding members and the first abutting portions are arranged such that, in the circumferential direction, the distance between adjacent guiding members and first abutting portions is smaller than the distance between two adjacent guiding members.

10. The impact tool according to claim 6, or any one of claims 7 to 9, which depends on claim 6, characterized in that The separation distance between the at least one second front abutting portion and the at least one second rear abutting portion is at least 1 / 3 of the extension distance of the guiding member in the length direction of the guiding member.

11. The impact tool according to claim 6, which depends on claim 5, or any one of claims 7 to 10, which depends on claim 5 or claim 6, characterized in that The housing has at least one rear stop portion, and the at least one rear stop portion is continuous with an edge portion on the side opposite to the final output shaft in the at least one first tapered surface of the at least one first rear abutting portion. The at least one rear stop portion is configured to contact the handle when the handle is in the second relative position and the handle is displaced by a specified amount in the radial direction with respect to the housing, thereby restricting the relative displacement between the handle and the housing in the radial direction.

12. The impact tool according to claim 6, which depends on claim 5, or any one of claims 7 to 11, which depends on claim 5 or claim 6, characterized in that The housing has at least one front stop, and the at least one front stop is continuous with an edge portion on a side close to the final output shaft in the at least one first conical surface of the at least one first front abutting portion. The at least one front stop is configured to contact the handle when the handle is in the second relative position and the handle is displaced by a predetermined amount in the radial direction relative to the housing, thereby restricting the relative displacement between the handle and the housing in the radial direction.

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