Impact tools

Abstract

To provide a technology which contributes to reduction of vibration transmission to a handle, including a cantilever holding part, in an impact tool.SOLUTION: An impact tool 1 includes: a tool body 2; a motor; a handle 3; at least one biasing member 41; and at least one guide part. The handle is connected to the tool body so as to be rotatable relative to the tool body and movable in at least an anteroposterior direction. The handle includes: a cover part 31 which is at least partially formed in a cylindrical shape and covers a part of the tool body; and a holding part which extends from the cover part in a cantilever manner in a direction intersecting with a drive shaft. The at least one biasing member biases the tool body and the handle in a direction such that these components separate from each other in the anteroposterior direction. The at least one guide part has: a first portion 51 provided at a portion, which is covered with the cover part, of the tool body; and a second portion which is provided at the cover part of the handle and connected to the first portion so as to be movable relative to the first portion in at least the anteroposterior direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an impact tool configured to linearly drive an accessory tool. [Background technology]

[0002] In impact tools, which perform machining operations on workpieces by linearly driving a tool tip along a drive shaft, particularly large vibrations occur in the extension direction of the drive shaft. In response to this, various vibration-proof housing structures have been proposed. For example, in an impact tool (hammer) disclosed in Patent Document 1, a handle including a gripping part is movable in the extension direction of the drive shaft and rotatable relative to a main body that houses a motor and a drive mechanism. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 7,886,838 Summary of the Invention [Problem to be solved by the invention]

[0004] In the impact tool of Patent Document 1, two ends of a long grip part are connected to another part of the main body or the handle. On the other hand, some impact tools are provided with a handle including a grip part having a free end (a so-called cantilever grip part).

[0005] An object of the present disclosure is to provide a technique for reducing the transmission of vibration to a handle, including a cantilever-shaped grip, in an impact tool. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, there is provided an impact tool configured to linearly drive a tool bit along a drive axis that defines a front-rear direction, the impact tool including a tool body, a motor, a handle, at least one biasing member, and at least one guide portion.

[0007] The tool body extends along the drive shaft. The motor is housed in the tool body. The motor has a motor shaft that is rotatable around an axis parallel to the drive shaft. The handle is connected to the tool body so as to be rotatable relative to the tool body and movable at least in the forward and backward directions. The handle includes a cover portion and a grip portion. The cover portion is at least partially formed into a cylindrical shape and covers a part of the tool body. The grip portion extends in a cantilever manner from the cover portion in a direction intersecting the drive shaft. Note that "the grip portion extends in a cantilever manner from the cover portion" means that only one end of the grip portion is connected to the cover portion and the other end of the grip portion is a free end.

[0008] The at least one biasing member is interposed between the tool body and the handle and biases the tool body and the handle in a direction away from each other in the front-rear direction. The at least one guide portion includes a first portion and a second portion. The first portion is provided on a portion of the tool body covered by the cover portion. The second portion is provided on the cover portion of the handle. The second portion is connected to the first portion so as to be movable at least in the front-rear direction relative to the first portion.

[0009] According to the above configuration, the first and second parts of the guide move relative to each other in the front-rear direction in response to the front-rear vibrations (i.e., the main vibrations occurring in the extension direction of the drive shaft) that occur while the tool bit is being driven, so that the handle including the cantilevered gripping part can move in the front-rear direction relative to the tool body. At this time, at least one biasing member can absorb the front-rear vibrations. Therefore, the front-rear vibrations transmitted from the tool body to the handle can be effectively reduced. Furthermore, the tool body and the handle rotate relatively to each other, so that the transmission of vibrations in the rotation direction can also be reduced. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a left side view of the hammer drill with the handle in an initial position. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a left side view of the hammer drill with the left member of the handle removed, showing the handle in an initial position. [Figure 4] FIG. 2 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 3 is a cross-sectional view taken along line VV in FIG. 2. [Figure 6] FIG. 13 is a side view of the elastic member fitted in the holder. [Figure 7] FIG. 2 is a left side view of the hammer drill with the handle in a forward position. [Figure 8] FIG. 2 is a left side view of the hammer drill with the left side member of the handle removed, showing the handle in a forward position; [Figure 9] 5 is a cross-sectional view corresponding to FIG. 4, showing the handle in a forward position; [Figure 10] FIG. 6 is a cross-sectional view corresponding to FIG. 5, showing the handle in a forward position; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In one or more embodiments of the present disclosure, the at least one guide may be configured to allow movement of the handle relative to the tool body in a forward / backward direction and in a direction transverse to the drive shaft, such that the at least one guide can reduce transmission of not only main forward / backward vibrations but also vibrations in a direction transverse to the drive shaft.

[0012] In one or more embodiments of the present disclosure, the at least one guide portion may include two guide portions. The two guide portions may include the drive shaft and be symmetrically disposed with respect to a plane extending in the extension direction of the grip portion. This configuration achieves a more stable relative movement between the tool body and the handle than when there is only one guide portion.

[0013] In one or more embodiments of the present disclosure, at least one guide portion may further include an elastic member that elastically connects the first portion and the second portion, which can effectively reduce vibrations transmitted from the tool body to the handle via the first portion and the second portion.

[0014] In one or more embodiments of the present disclosure, one of the first part and the second part may be configured to hold the elastic member so as to be movable in the front-rear direction relative to one of the first part and the second part. This configuration allows for a simple configuration to guide the relative movement between the first part and the second part in the front-rear direction (and thus the relative movement between the tool body and the handle).

[0015] In one or more embodiments of the present disclosure, the elastic member may be an annular elastic member. The other of the first and second parts may include a protrusion fitted inside the elastic member. This configuration allows the first and second parts to be elastically connected with a simple configuration and allows relative movement between the first and second parts in a direction intersecting the axis of the protrusion (and thus relative movement between the tool body and the handle).

[0016] In one or more embodiments of the present disclosure, the inner circumferential surface of the elastic member and the outer circumferential surface of the protrusion may be in a partially non-contact state, which makes it easier for the elastic member to elastically deform compared to a case in which the inner circumferential surface of the elastic member and the outer circumferential surface of the protrusion are in substantially full contact with each other.

[0017] In one or more embodiments of the present disclosure, at least one guide portion may further include a metal holder interposed between one of the first part and the second part and the elastic member, and holding the elastic member. That is, the elastic member may be held by one of the first part and the second part via the holder. The holder may be slidable in the front-rear direction relative to one of the first part and the second part. With this configuration, the elastic member can move more easily in the front-rear direction than when the elastic member is held directly by one of the first part and the second part. In addition, wear of the elastic member can be suppressed.

[0018] In one or more embodiments of the present disclosure, the at least one guide portion may include at least one front guide portion and at least one rear guide portion. The at least one rear guide portion may be disposed at a position closer to the grip portion in the front-rear direction than the at least one front guide portion. According to this configuration, the at least one front guide portion and the at least one rear guide portion can more stably guide the relative movement of the tool body and the handle in the front-rear direction at different positions in the front-rear direction.

[0019] In one or more embodiments of the present disclosure, the elastic deformation characteristics of the elastic member of the at least one front guide portion and the elastic deformation characteristics of the elastic member of the at least one rear guide portion may be different from each other. The elastic deformation characteristics may also be rephrased as the ease of elastic deformation. According to this configuration, by appropriately setting the elastic deformation characteristics of the elastic member, one of the at least one front guide portion and the at least one rear guide portion can be used as a fulcrum for the relative rotation of the tool body and the handle.

[0020] In one or more embodiments of the present disclosure, the elastic member of the at least one front guide portion may be configured to be less susceptible to elastic deformation than the elastic member of the at least one rear guide portion. With this configuration, the at least one front guide portion located farther away from the grip portion can be used as a fulcrum for relative rotation, effectively reducing transmission of vibration in the direction of relative rotation between the tool body and the handle to the grip portion.

[0021] In one or more embodiments of the present disclosure, the at least one biasing member may include two biasing members arranged symmetrically with respect to the axis on a plane including the axis of the motor shaft, which can stabilize the relative movement between the tool body and the handle compared to a case where one biasing member is provided.

[0022] <Example> A hammer drill 1 according to a typical but non-limiting embodiment of the present disclosure will be described below with reference to Figs. 1 to 10. The hammer drill 1 is an example of a power tool (a so-called impact tool) capable of driving the tip tool 91 linearly by striking the tip tool 91. More specifically, the hammer drill 1 is a power tool capable of performing an operation of driving the tip tool 91 linearly along a predetermined drive axis A1 (hereinafter referred to as an impact operation) and an operation of rotating the tip tool 91 around the drive axis A1 (hereinafter referred to as a rotation operation).

[0023] As shown in FIG. 1, the outer shell of a hammer drill 1 is mainly formed by a tool body 2 and a handle 3 connected to the tool body 2.

[0024] The tool body 2 is a hollow body that houses the main mechanism of the hammer drill 1, and is also referred to as a main housing, an outer housing, or the like. The tool body 2 extends along a drive axis A1 of the tool tip 91. A tool holder 79 is disposed in one end of the tool body 2 in the extension direction of the drive axis A1 (hereinafter simply referred to as the drive axis direction). The tool tip 91 can be removably attached to the tool holder 79. The tool body 2 mainly houses a motor 71 and a drive mechanism 75 configured to drive the tool tip 91 held by the tool holder 79 by the power of the motor 71. In this embodiment, the motor 71 is disposed so that a rotation axis A2 of a motor shaft 711 that rotates integrally with the rotor extends parallel to the drive axis A1.

[0025] The handle 3 is formed separately from the tool body 2 and is connected to the tool body 2 so as to be rotatable relative to the tool body 2 and movable in the drive shaft direction. The handle 3 has a grip portion 33 configured to be gripped by a user. The grip portion 33 extends so as to protrude from the other end of the tool body 2 in the drive shaft direction (i.e., the end opposite to the one end where the tool holder 79 is arranged) in a direction intersecting the drive shaft A1 (more specifically, in a direction approximately perpendicular to the drive shaft A1 and the rotation axis A2). The protruding end of the grip portion 33 is a free end. The grip portion 33 has a trigger 331 that is pressed (pulled) by the user. In the hammer drill 1, the motor 71 is energized in response to the pressing operation of the trigger 331, and the drive mechanism 75 is driven, thereby performing a striking operation and / or a rotating operation.

[0026] The detailed configuration of the hammer drill 1 will be described below. For convenience, in the following description, the extending direction of the drive shaft A1 (the longitudinal direction of the tool body 2) is defined as the front-rear direction of the hammer drill 1. In the front-rear direction, the side on which the tool holder 79 is arranged is defined as the front side of the hammer drill 1, and the opposite side (the side on which the gripping portion 33 is arranged) is defined as the rear side. A direction perpendicular to the drive shaft A1 and roughly corresponding to the extending direction of the gripping portion 33 (a direction perpendicular to the drive shaft A1 and the rotation axis A2) is defined as the up-down direction of the hammer drill 1. In the up-down direction, the base end side of the gripping portion 33 is defined as the upper side of the hammer drill 1, and the free end side of the gripping portion 33 is defined as the lower side of the hammer drill 1. In addition, a direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction of the hammer drill 1.

[0027] First, the configuration and internal structure of the tool body 2 will be described.

[0028] The tool body 2 includes a drive mechanism housing portion 21 and a motor housing portion 23 .

[0029] As shown in FIG. 1, the drive mechanism accommodating section 21 is a hollow body that accommodates the drive mechanism 75. The drive mechanism accommodating section 21 constitutes the front half of the tool body 2. The front end of the drive mechanism accommodating section 21 is formed in a cylindrical shape, and a tool holder 79 is disposed inside the drive mechanism accommodating section 21. The portion of the drive mechanism accommodating section 21 other than the front end is formed in a generally rectangular tubular shape. Although detailed illustration and description are omitted because the configuration is well known, the drive mechanism 75 includes a motion conversion mechanism and an impact mechanism that perform an impact operation, and a rotation transmission mechanism that performs a rotation operation. The motion conversion mechanism typically employs a mechanism that converts rotational motion into linear motion using a swinging member (e.g., a swash bearing, a wobble plate / bearing) or a crank mechanism and a piston. The rotation transmission mechanism typically employs a reduction mechanism including a plurality of gears.

[0030] In this embodiment, the hammer drill 1 has three operation modes: an impact mode (hammering only) in which only an impact operation is performed, a rotation mode (rotation only) in which only a rotation operation is performed, and a rotation impact mode (hammering with rotation) in which an impact operation and a rotation operation are performed simultaneously. This is also a well-known configuration, so detailed illustration and description will be omitted, but the drive mechanism 75 operates according to the operation mode selected by the user via the mode switching knob.

[0031] 1, 3 and 4, the motor accommodating portion 23 is a hollow body that accommodates the motor 71. The motor accommodating portion 23 is formed in a cylindrical shape with a closed rear end. In this embodiment, the motor accommodating portion 23 is a single member (a seamless member) that is formed separately from the drive mechanism accommodating portion 21. The motor accommodating portion 23 is connected and fixed to the rear end of the drive mechanism accommodating portion 21 by screws (not shown) and constitutes the rear half of the tool body 2.

[0032] In this embodiment, an AC motor having a commutator is used for the motor 71. A fan 713 is fixed to a portion of the motor shaft 711 extending in the front-rear direction that protrudes forward of the stator. The fan 713 is disposed within the front end portion 231 of the motor housing portion 23. The front end portion 231 of the motor housing portion 23 protrudes radially outward from the stator beyond a portion extending rearward of the front end portion 231 (a portion in which the stator and the like are housed).

[0033] In this embodiment, the motor housing section 23 of the tool body 2 is provided with two first spring receivers (spring seats) 25 (see FIG. 5) and four guide recesses 51 (see FIG. 4) as a configuration for elastically connecting the tool body 2 and the handle 3. The elastic connection structure between the tool body 2 and the handle 3 will be described in detail later.

[0034] Next, the configuration and internal structure of the handle 3 will be described.

[0035] 2 to 4, in this embodiment, the handle 3 is formed by connecting and fixing a left member (left shell, left handle portion) 3L and a right member (right shell, right handle portion) 3R to each other in the left-right direction at multiple points with screws (not shown). The handle 3 also includes a cover portion 31 and a grip portion 33.

[0036] As shown in Figs. 1 to 4, the cover portion 31 is generally formed in a cylindrical shape with a closed rear end. The cover portion 31 covers the rear portion of the tool body 2, more specifically, most of the motor housing portion 23. The cover portion 31 includes a left wall portion 31L, a right wall portion 31R, an upper wall portion, a lower wall portion, and a rear wall portion, which are arranged on the left side, right side, upper side, lower side, and rear side of the motor housing portion 23, respectively. Note that the central portions of the left wall portion 31L and the right wall portion 31R in the vertical direction protrude forward more than the other portions. Note that the portion of the rear portion of the tool body 2 that is not covered by the cover portion 31 is covered by a bellows 29. The bellows 29 is configured to be expandable and contractible in the front-rear direction in response to the relative movement of the tool body 2 and the handle 3.

[0037] In this embodiment, the cover portion 31 is provided with two second spring receivers (spring seats) 35 (see FIG. 5) and four guide protrusions 53 (see FIG. 4) as a configuration for elastically connecting the tool body 2 and the handle 3. The second spring receivers 35 are connected to the first spring receiver 25 via the biasing member 41. The guide protrusions 53 are connected to the guide recesses 51 via the elastic member 55 and the holder 57. The connecting structure between the tool body 2 and the handle 3 will be described in detail later.

[0038] As shown in FIG. 3, the grip portion 33 is formed in a long cylindrical shape. The grip portion 33 extends downward from the cover portion 31 in a cantilever shape. That is, the grip portion 33 extends in the up-down direction below the lower end of the tool body 2. A trigger 331 is disposed at the upper end of the grip portion 33. A switch 335 is disposed behind the trigger 331 inside the grip portion 33. The switch 335 is normally held in the off state, and is turned on in response to a pressing operation of the trigger 331. In response to the switch 335 being turned on, the motor 71 is energized. In addition, a power cord 337 that can be connected to an external AC power source extends from the lower end of the grip portion 33 (the free end, the protruding end of the handle 3).

[0039] The connecting structure between the tool body 2 and the handle 3 will now be described in detail.

[0040] First, the connection structure between the first spring bearing 25 and the second spring bearing 35 will be described in detail.

[0041] As shown in FIG. 5, the two first spring receivers (spring seats) 25 are provided at the front end 231 of the motor housing 23 of the tool body 2. More specifically, one of the first spring receivers 25 is provided at the lower left rear end of the front end 231. The other of the first spring receivers 25 is provided at the upper right rear end of the front end 231. More specifically, the two first spring receivers 25 are arranged symmetrically with respect to the rotation axis A2 on an imaginary plane P1 (see FIG. 2) that includes the rotation axis A2 of the motor shaft 711 and extends from the lower left to the upper right when the hammer drill 1 is viewed from the rear. That is, the two first spring receivers 25 are at different positions in the up-down direction and the left-right direction, and at approximately the same position in the front-rear direction. Also, the distances between the rotation axis A2 of the motor shaft 711 and each of the two first spring receivers 25 are approximately the same.

[0042] Each of the first spring bearings 25 is configured to receive (contact with) a first end 411 of the two ends of the biasing member 41. In this embodiment, the biasing member 41 is a compression coil spring. More specifically, the first spring bearing 25 has a protrusion 251 protruding rearward from the rear end surface of the front end 231. The first end 411 of the biasing member 41 is fitted into the protrusion 251 of the first spring bearing 25 and contacts an abutment surface 252, which is the rear end surface of the front end 231 (shoulder portion) of the motor accommodating portion 23.

[0043] The two second spring bearings 35 are provided corresponding to the two first spring bearings 25 of the tool body 2, respectively. More specifically, one of the second spring bearings 35 is provided in the lower left center of the cover part 31, and the other of the second spring bearings 35 is provided in the upper right center of the cover part 31. More specifically, the two second spring bearings 35 are arranged symmetrically on the plane P1 (see FIG. 2) and with respect to the rotation axis A2. Moreover, the two second spring bearings 35 are respectively arranged directly behind the two first spring bearings 25. That is, the second spring bearings 35 are arranged on a straight line that passes through the first spring bearings 25 and is parallel to the rotation axis A2 of the motor shaft 711 (extending in the front-rear direction).

[0044] Each of the second spring bearings 35 is configured to receive (contact with) a second end 412 of the two ends of the urging member 41. More specifically, the second spring bearings 35 have a base portion 351 that protrudes into the cover portion 31, and a protrusion 354 that protrudes forward from the base portion 351. The second end 412 of the urging member 41 is fitted into the protrusion 354, and contacts an abutment surface 352 that is the front end surface of the base portion 351.

[0045] In this manner, the first spring receiver 25 and the second spring receiver 35 are elastically connected by the biasing member 41. The biasing member 41 is held in a compressed state between the first spring receiver 25 and the second spring receiver 35, and biases the tool body 2 and the handle 3 in directions away from each other in the front-rear direction. In other words, the biasing member 41 biases the tool body 2 and the handle 3 forward and backward, respectively.

[0046] Next, the connection structure between the guide recess 51 and the guide projection 53 will be described.

[0047] As shown in FIG. 3 and FIG. 4, the four guide recesses 51 are arranged two on the left side 23L and two on the right side 23R of the motor housing 23. More specifically, two guide recesses 51 are arranged on the left side 23L, spaced apart in the front-rear direction. Similarly, two guide recesses 51 are arranged on the right side 23R, spaced apart in the front-rear direction. The two guide recesses 51 on each of the left side 23L and the right side 23R are provided at the front end and rear end of the part of the motor housing 23 that is covered by the cover part 31 of the handle 3 in the front-rear direction. The two guide recesses 51 are arranged at substantially the same position in the up-down direction. In other words, the two guide recesses 51 are arranged on a straight line extending in the front-rear direction in a side view (when the tool body 2 is viewed from the left or right). In this embodiment, the two guide recesses 51 are arranged on the rotation axis A2 of the motor shaft 711 in a side view.

[0048] Among the four guide recesses 51, the pair of left and right guide recesses 51 on the front side are disposed symmetrically with respect to an imaginary plane P2 (see FIG. 2) that passes through the left-right center of the hammer drill 1 (tool body 2) and extends in the up-down direction (the substantial extending direction of the grip portion 33). The plane P2 includes the drive shaft A1 and can be said to be an imaginary plane (a plane that includes the drive shaft A1 and the rotation axis A2) that extends in the up-down direction. Similarly, the pair of left and right guide recesses 51 on the rear side are also disposed symmetrically with respect to the plane P2.

[0049] Although the four guide recesses 51 have slight differences in shape, they are all recesses having a depth in the left-right direction and have substantially the same configuration. In detail, each guide recess 51 is defined by a peripheral wall portion protruding leftward from the left side 23L of the motor housing portion 23, or a peripheral wall portion protruding rightward from the right side 23R of the motor housing portion 23. The length of each guide recess 51 in the front-rear direction is greater than its width in the up-down direction. In addition, the front end and rear end of each guide recess 51 are formed in a semicircular shape in a side view.

[0050] As shown in FIG. 4, the four guide protrusions 53 are arranged on the left wall 31L of the cover part 31, two on the right wall 31R, respectively, corresponding to the four guide recesses 51 of the tool body 2. More specifically, two guide protrusions 53 are arranged on the left wall 31L of the cover part 31, spaced apart in the front-rear direction. Similarly, two guide protrusions 53 are arranged on the right wall 31R, spaced apart in the front-rear direction. The two guide protrusions 53 on each of the left wall 31L and the right wall 31R are arranged at substantially the same position in the up-down direction. In other words, the two guide protrusions 53 are arranged on a straight line extending in the front-rear direction in a side view (when the handle 3 is viewed from the left or right) (more specifically, on the rotation axis A2 of the motor shaft 711).

[0051] Among the four guide protrusions 53, the pair of left and right guide protrusions 53 on the front side are disposed symmetrically with respect to the plane P2 (see FIG. 2). Similarly, the pair of left and right guide protrusions 53 on the rear side are also disposed symmetrically with respect to the plane P2.

[0052] Although the four guide protrusions 53 have slight differences in shape, they are all protrusions with a circular cross-sectional outline and have substantially the same configuration. In detail, each guide protrusion 53 is a protrusion that protrudes rightward from the left wall portion 31L (i.e., toward the left side portion 23L of the motor accommodating portion 23) or a protrusion that protrudes leftward from the right wall portion 31R (i.e., toward the right side portion 23R of the motor accommodating portion 23). The outer diameter of each guide protrusion 53 is smaller than the width of the guide recess 51 in the vertical direction. In addition, the length of each guide protrusion 53 is set so that the protruding end of the guide protrusion 53 does not contact the outer surface of the motor accommodating portion 23 (the bottom surface of the guide recess 51).

[0053] As shown in FIG. 4, in this embodiment, the guide protrusion 53 is connected to the guide recess 51 via the elastic member 55 and the holder 57 so as to be movable in the front-rear direction relative to the guide recess 51. The guide recess 51, the guide protrusion 53, the elastic member 55, and the holder 57 constitute a guide section 5 that guides the relative movement in the front-rear direction between the tool body 2 and the handle 3. In this embodiment, four guide sections 5 are provided on the left side and the right side of the hammer drill 1, two of which are provided. In the following description, the four guide sections 5 are collectively referred to as the guide section 5, and at least one of the four guide sections is referred to without distinction. When referring to at least one of the pair of left and right guide sections 5 on the front side among the four guide sections 5, the guide section 5 is referred to as the front guide section 5F, and when referring to at least one of the pair of left and right guide protrusions 53 on the rear side, the guide section 5 is referred to as the rear guide section 5R.

[0054] As shown in Figs. 3, 4 and 6, the elastic member 55 is formed in an annular shape (short cylinder shape). In other words, the elastic member 55 is an elastic ring. In this embodiment, all of the four elastic members 55 have substantially the same shape (inner diameter, outer diameter, thickness). A plurality of notches 551 are formed on the inner peripheral surface of each elastic member 55 at equal intervals in the circumferential direction. Each notch 551 is formed in a V-shaped cross section.

[0055] In this embodiment, all the four elastic members 55 are made of silicone rubber. However, the elastic members 55 of the front guide portion 5F and the elastic members 55 of the rear guide portion 5R have different elastic deformation characteristics (ease of elastic deformation). More specifically, the elastic members 55 of the front guide portion 5F are configured to be less susceptible to elastic deformation than the elastic members 55 of the rear guide portion 5R. Specifically, the front elastic members 55F are made of silicone rubber having a higher hardness (harder) than the rear elastic members 55R. In the following, when the four elastic members 55 are collectively referred to, or when at least one of the four is referred to without distinction, it is simply referred to as the elastic members 55. When referring to the elastic members 55 of the front guide portion 5F among the four elastic members 55, it is referred to as the front elastic member 55F, and when referring to the elastic members 55 of the rear guide portion 5R, it is referred to as the rear elastic member 55R.

[0056] As shown in Figs. 3 and 4, the holder 57 is configured to be slidable in the front-rear direction within the guide recess 51 of the tool body 2. More specifically, the holder 57 includes a disk-shaped bottom wall portion having a through hole in the center, and a peripheral wall portion surrounding the outer edge of the bottom wall portion. The outer diameter of the peripheral wall portion is approximately equal to the vertical width of the guide recess 51 of the tool body 2, and is shorter than the front-rear length of the guide recess 51. The holder 57 is slidable in the front-rear direction within the guide recess 51 with the bottom wall portion at least partially in contact with the bottom surface of the guide recess 51, and the peripheral wall portion partially in contact with the surfaces that respectively define the upper and lower ends of the guide recess 51. The holder 57 is also engageable with the semicircular front and rear ends of the guide recess 51. Furthermore, the holder 57 is rotatable within the guide recess 51 around an axis extending in the left-right direction. Meanwhile, the movement of the holder 57 in the vertical direction within the guide recess 51 is restricted. In this embodiment, the holder 57 is made of a metal (for example, iron or an iron alloy).

[0057] The elastic member 55 is fitted and held in the holder 57. A part of the elastic member 55 always protrudes outward beyond the protruding end of the peripheral wall of the holder 57. Furthermore, the guide protrusion 53 of the handle 3 is fitted inside the elastic member 55. As described above, the notch 551 is formed in the inner peripheral surface of the elastic member 55, so that the inner peripheral surface of the elastic member 55 and the outer peripheral surface of the guide protrusion 53 are partially in a non-contact state. Therefore, the elastic member 55 is more likely to elastically deform in a direction intersecting the axis of the guide protrusion 53 than when the inner peripheral surface of the elastic member 55 and the outer peripheral surface of the guide protrusion 53 are in contact with each other substantially entirely.

[0058] The portion of the elastic member 55 that protrudes outward from the protruding end of the peripheral wall of the holder 57 abuts against the inner surface of the left wall 31L or right wall 31R of the handle 3 (cover part 31) around the base end of the guide projection 53. The tip of the guide projection 53 is disposed in the through hole of the bottom wall of the holder 57 and is spaced apart from the bottom surface of the guide recess 51 (the outer surface of the motor accommodating part 23).

[0059] With such a connection structure, in each guide portion 5, the elastic member 55 is held between the peripheral wall portion of the holder 57 and the guide protrusion 53 in a state in which it is slightly compressed in the radial direction. Also, the elastic member 55 is held between the bottom wall portion of the holder 57 and the left wall portion 31L or the right wall portion 31R in a state in which it is slightly compressed in the left-right direction. In this manner, in each of the four guide portions 5, the guide recess 51 and the guide protrusion 53 are elastically connected via the holder 57 and the elastic member 55. The tool body 2 and the holder 57, and the handle 3 are maintained in a state in which they are spaced apart from each other by the elastic member 55.

[0060] As described above, the biasing member 41 biases the tool body 2 and the handle 3 in directions away from each other (i.e., forward and backward) in the front-rear direction. Therefore, in the initial state, the handle 3 is held by the biasing force of the biasing member 41 at a position (position shown in Figs. 3 and 4; hereinafter referred to as the initial position) where the holder 57 abuts (fits) against the rear end of the guide recess 51 in each guide part 5.

[0061] On the other hand, when an external force acts in a direction that brings the tool body 2 and the handle 3 closer to each other in the front-rear direction (for example, a pressing force when a user presses the tool tip 91 against a workpiece), the handle 3 moves forward from the initial position relative to the tool body 2 while compressing the biasing member 41 (against the biasing force of the biasing member 41) as shown in Figs. 7 to 10. At this time, the holder 57 connected to the guide protrusion 53 of the handle 3 via the elastic member 55 slides forward along the guide recess 51. During this time, the elastic member 55 is not substantially compressed and deformed from the initial state. The handle 3 moves forward relative to the tool body 2 against the biasing force of the biasing member 41 until the holder 57 abuts (fits) against the front end of the guide recess 51 (the position shown in Figs. 8 and 9; hereinafter, referred to as the front position).

[0062] When the handle 3 moves further forward from the forward position, a portion of the elastic member 55 interposed between the front end of the guide protrusion 53 and the front end of the guide recess 51 (the peripheral wall of the holder 57) is elastically deformed (compressively deformed) in each guide part 5. In response to the elastic deformation of the elastic member 55, the handle 3 can move relative to the tool body 2 up to a frontmost position forward of the forward position.

[0063] When the external force in the direction of bringing the tool body 2 and the handle 3 closer to each other is released, the handle 3 is urged by the urging member 41 and returns to its initial position relative to the tool body 2. At this time, in each guide part 5, a portion of the elastic member 55 that is interposed between the rear end of the guide protrusion 53 and the rear end of the guide recess 51 (the peripheral wall part of the holder 57) can absorb the impact when the holder 57 abuts against the surface that defines the rear end of the guide recess 51.

[0064] In addition, when the tool body 2 and the handle 3 move relative to each other in the left-right direction, the elastic member 55 is compressed between the left side portion 23L (bottom wall portion of the holder 57) of the motor accommodating portion 23 and the left wall portion 31L of the cover portion 31, or between the right side portion 23R (bottom wall portion of the holder 57) and the right wall portion 31R, and elastically deforms.

[0065] Furthermore, when the tool body 2 and the handle 3 move relative to each other in the up-down direction, a portion of the elastic member 55 that is interposed between the upper end of the guide protrusion 53 and the upper end of the guide recess 51 (the peripheral wall of the holder 57) or between the lower end of the guide protrusion 53 and the lower end of the guide recess 51 (the peripheral wall of the holder 57) is elastically deformed (compressively deformed). At this time, in this embodiment, the handle 3 can substantially rotate relative to the tool body 2, with the pair of left and right front guide portions 5F (specifically, the guide protrusions 53) as fulcrums.

[0066] More specifically, as described above, the front elastic member 55F of the front guide portion 5F is harder than the rear elastic member 55R of the rear guide portion 5R and is less susceptible to elastic deformation. In other words, the rear elastic member 55R is more susceptible to elastic deformation than the front elastic member 55F. Therefore, when an external force acts to move the tool body 2 and the handle 3 relatively in the up-down direction, the handle 3 can be substantially rotated with respect to the tool body 2, with the guide protrusions 53 of the pair of left and right front guide portions 5F as fulcrums (around the rotation axis A3 that roughly coincides with the axis of the guide protrusions 53). The same applies when an external force acts to rotate the tool body 2 and the handle 3 relatively around an axis extending in the left-right direction.

[0067] Although the front elastic member 55F is less susceptible to elastic deformation than the rear elastic member 55R, it can also be elastically deformed. Therefore, in the front guide portion 5F, the guide protrusion 53 can move in a direction intersecting the axis of the guide protrusion 53 (for example, the front-rear direction or the up-down direction) relative to the holder 57 and the guide recess 51 (and thus the tool body 2) in response to the elastic deformation of the front elastic member 55F. In other words, the rotation axis A3 of the handle 3 relative to the tool body 2 can fluctuate in response to the elastic deformation of the elastic member 55F.

[0068] The actions of the tool body 2 and the handle 3 during the striking operation will now be described.

[0069] When the driving mechanism 75 performs the impact operation, the tool tip 91 is driven along the driving shaft A1, and the largest vibration is generated in the tool body 2 in the driving shaft direction (front-rear direction). In response to this vibration, in each guide portion 5, the holder 57 connected to the guide protrusion 53 via the elastic member 55 slides in the front-rear direction within the guide recess 51. In addition, the guide protrusion 53 can move in the front-rear direction within the holder 57 due to the elastic deformation of the elastic member 55. Therefore, the handle 3 moves in the front-rear direction relative to the tool body 2 within a range between the initial position and the most forward position. During this time, the biasing member 41 expands and contracts in response to the relative movement of the tool body 2 and the handle 3, thereby reducing the transmission of vibration to the handle 3. Furthermore, when the handle 3 moves between the forward position and the most forward position, not only the expansion and contraction of the biasing member 41 but also the elastic deformation of the elastic member 55 effectively reduces the transmission of vibration to the handle 3. In this manner, in this embodiment, by utilizing the expansion and contraction of the biasing member 41 and the movement and elastic deformation of the elastic member 55, an effective reduction in vibration transmission according to the magnitude of vibration in the front-rear direction is realized.

[0070] In addition, in this embodiment, two pairs of guide portions 5 (a pair of front guide portions 5F and a pair of rear guide portions 5R) are arranged at a distance in the fore-and-aft direction, so that the relative movement between the tool body 2 and the handle 3 in the fore-and-aft direction can be stably guided.

[0071] Furthermore, the simple configuration of the holder 57 that is slidable within the guide recess 51 can stably guide the relative movement between the guide recess 51 and the guide protrusion 53 in the front-rear direction (and thus the relative movement between the tool body 2 and the handle 3). Furthermore, since the holder 57 is made of metal, it can smoothly slide within the synthetic resin guide recess 51. Also, wear of the elastic member 55 can be suppressed compared to when the elastic member 55 connected to the guide protrusion 53 slides directly within the guide recess 51.

[0072] In this embodiment, the tool body 2 and the handle 3 are biased by two biasing members 41. Therefore, the relative movement between the tool body 2 and the handle 3 can be stabilized compared to the case where one spring is provided. In particular, the two biasing members 41 are arranged symmetrically with respect to the rotation axis A2 of the motor shaft 711 and at different positions in the up-down and left-right directions. Therefore, when the handle 3 moves in the front-rear direction relative to the tool body 2, unnecessary tilting of the handle 3 in the up-down or left-right directions can be suppressed.

[0073] Furthermore, in this embodiment, the handle 3 can rotate with respect to the tool body 2, with a pair of front guide parts 5F (guide protrusions 53 (holder 57)) as fulcrums. Therefore, the transmission of vibration in the relative rotation direction between the tool body 2 and the handle 3 can also be effectively reduced. In this embodiment, the front guide part 5F is set as the relative rotation fulcrum between the tool body 2 and the handle 3 by setting the elastic deformation characteristics of the elastic member 55 described above. The front guide part 5F is located farther from the grip part 33 than the rear guide part 5R. In particular, in this embodiment, the guide recess 51 and the guide protrusion 53 of the front guide part 5F are respectively arranged at the frontmost positions of the motor housing part 23 and the cover part 31 where they overlap with each other. Therefore, the transmission of vibration in the relative rotation direction between the tool body 2 and the handle 3 to the grip part 33 can be effectively reduced.

[0074] Furthermore, in this embodiment, in each guide portion 5, the guide recess 51 and the guide protrusion 53 are connected via an elastic member 55. Therefore, compared to a configuration in which the guide recess 51 and the guide protrusion 53 are directly connected (contacted), it is possible to effectively reduce vibration transmitted from the tool body 2 to the handle 3 via the guide recess 51 and the guide protrusion 53.

[0075] Furthermore, the annular elastic member 55 fitted around the guide protrusion 53 allows relative movement between the tool body 2 and the handle 3 due to elastic deformation in a direction intersecting the axis of the guide protrusion 53 and in the extension direction of the axis of the guide protrusion 53 (i.e., left-right direction). The tool body 2 also experiences vibrations in other directions (e.g., up-down and left-right directions) although these vibrations are not as large as those in the front-back direction. The connecting structure using the elastic member 55 of this embodiment can appropriately respond to vibrations in any direction other than the front-back direction according to the elastic deformation of the elastic member 55.

[0076] The correspondence between the configurations (features) of the above-mentioned embodiments and the configurations (features) of this disclosure is shown below. However, the configurations (features) of the embodiments are merely examples and do not limit the configurations (features) of this disclosure or the present invention.

[0077] The hammer drill 1 is an example of an "impact tool". The drive shaft A1 is an example of a "drive shaft". The tip tool 91 is an example of a "tip tool". The tool body 2 is an example of a "tool body". The motor 71 is an example of a "motor". The motor shaft 711 is an example of a "motor shaft". The rotating shaft A2 is an example of a "motor shaft axis". The handle 3 is an example of a "handle". The cover portion 31 is an example of a "cover portion". The grip portion 33 is an example of a "grip portion". The biasing member 41 is an example of a "biasing member". The guide portion 5 is an example of a "guide portion". The guide recess 51 is an example of a "first portion". The guide protrusion 53 is an example of a "second portion".

[0078] The elastic member 55 is an example of an "elastic member". The guide recess 51 is an example of "one of the first and second parts". The guide protrusion 53 is an example of "the other of the first and second parts" and a "protrusion". The holder 57 is an example of a "holder". The front guide portion 5F is an example of a "front guide portion". The rear guide portion 5R is an example of a "rear guide portion". The front elastic member 55F is an example of an "elastic member of the front guide portion". The rear elastic member 55R is an example of an "elastic member of the rear guide portion". The plane P1 is an example of a "plane including the axis of the motor shaft".

[0079] <Modification> It should be noted that the above embodiment is merely illustrative, and the impact tool according to the present disclosure is not limited to the illustrated hammer drill 1. For example, non-limiting modifications as exemplified below may be made. Furthermore, at least one of these modifications may be adopted in combination with the hammer drill 1 and at least one of the configurations (features) described in the claims.

[0080] In the above embodiment, the hammer drill 1 is exemplified as the impact tool, but the features of the present disclosure may be applied to another electric tool capable of performing an impact operation (for example, an electric hammer capable of performing only an impact operation without performing a rotation operation). The hammer drill 1 may have only two operation modes, an impact mode and a rotation mode. The configuration and arrangement of the motor 71 and the drive mechanism 75 may be appropriately changed depending on the impact tool to which the features of the present disclosure are applied. For example, a direct current motor (for example, a brushless DC motor) may be adopted for the motor 71. In this case, for example, a battery attachment section to which a rechargeable battery (also referred to as a battery pack) can be attached and detached may be provided on the tool body 2 or the handle 3.

[0081] The connecting structure between the tool body 2 and the handle 3 can be modified as appropriate. Modified examples of the connecting structure between the tool body 2 and the handle 3 will be given below.

[0082] For example, the biasing member that biases the tool body 2 and the handle 3 in a direction away from each other in the front-rear direction is not limited to the biasing member 41. For example, a type of spring other than a compression coil spring (e.g., a tension coil spring, a leaf spring, a torsion spring, etc.) can be adopted. Alternatively, an elastic member other than a spring, such as rubber or a synthetic resin, can be adopted. In addition, the number and positions of the biasing members 41 are not limited to the number and positions exemplified in the above embodiment. For example, only one biasing member 41 may be provided on the plane P2. Three or more biasing members 41 may be provided. In addition, the configurations of the first spring receiver 25 and the second spring receiver 35 that receive the ends of the biasing member 41 can be appropriately changed depending on the type, position, etc. of the biasing member adopted.

[0083] Furthermore, the structure for guiding the relative movement of the tool body 2 and the handle 3 in the front-rear direction is not limited to the guide portion 5. For example, the shapes of the guide recess 51 and the guide protrusion 53 may be appropriately changed. For example, the guide recess 51 may not be a bottomed recess, but may be an opening (through hole) that penetrates the wall of the motor housing portion 23. Contrary to the guide portion 5, a recess or through hole extending in the front-rear direction may be provided in the cover portion 31 of the handle 3, and a protrusion may be provided in a portion of the tool body 2 that is covered by the cover portion 31. The protrusion of the tool body 2 may be movable at least in the front-rear direction along the recess or through hole of the cover portion 31.

[0084] In addition, the type, shape, number, position, etc. of the elastic member 55 are not limited to the above example. For example, the elastic member 55 may be formed of a type of rubber other than silicone rubber, or an elastically deformable synthetic resin (for example, a synthetic resin foam). In addition, instead of the annular elastic member 55, an elastic member 55 having another shape may be adopted. Alternatively, a plurality of elastic members may be disposed between the outer circumferential surface of the guide protrusion 53 and the peripheral wall portion of the holder 57. The shape of the holder 57 may also be changed according to the change of the elastic member 55 and / or the guide recess 51. In addition, the material of the holder 57 is not limited to metal, and may be formed of, for example, a type of synthetic resin different from that of the tool body 2.

[0085] Furthermore, the holder 57 may be omitted, and the elastic member 55 may be directly held in the guide recess 51 so as to be slidable in the front-rear direction. In this case, it is preferable that at least the surface of the elastic member 55 that slides with the guide recess 51 is coated with a coating that improves sliding and suppresses wear. Alternatively, an elastic member having an opening that extends linearly in the front-rear direction may be fitted inside the guide recess 51. The guide protrusion 53 may be slidable in the front-rear direction within the opening of the elastic member.

[0086] The front elastic member 55F of the front guide portion 5F and the rear elastic member 55R of the rear guide portion 5R may have different elastic deformation characteristics (ease of elastic deformation) depending on the difference in material or shape. For example, the front elastic member 55F and the rear elastic member 55R may be formed in the same shape using rubber or synthetic resin having different elastic moduli. Alternatively, the front elastic member 55F and the rear elastic member 55R may be formed using the same rubber or synthetic resin to have the same inner diameter and outer diameter, and multiple notches 551 may be formed only in the rear elastic member 55R. In order to partially put the inner peripheral surface of the elastic member 55 and the outer peripheral surface of the guide protrusion 53 in a non-contact state, multiple protrusions protruding radially outward may be provided on the outer peripheral surface of the guide protrusion 53 instead of the notches 551.

[0087] The arrangement of the guide parts 5 is not limited to the above example. For example, in the above embodiment, the two guide parts 5 provided on the left and right parts of the hammer drill 1 are on a straight line extending in the front-rear direction in a side view (at the same position in the up-down direction), but may be arranged at different positions in the up-down direction. Also, the two guide parts 5 may be arranged on a straight line extending in the front-rear direction above or below the rotation axis A2 of the motor shaft 711 in a side view. Note that the positions of the two guide parts 5 can be appropriately changed within the area where the tool body 2 (motor housing part 23) and the handle 3 (cover part 31) overlap, but it is preferable that they are as far apart from each other as possible in the front-rear direction.

[0088] The hammer drill 1 may include at least one guide portion 5, and the number of guide portions 5 is not limited to the above example (four). For example, the hammer drill 1 may include only a pair of left and right guide portions 5 (for example, only a pair of front guide portions 5F). When a pair of left and right guide portions 5 is provided, the handle 3 can rotate relative to the tool body 2 in response to the holder 57 of each guide portion 5 rotating within the guide recess 51 together with the elastic member 55 and the guide protrusion 53. The hammer drill 1 may also include only two guide portions 5 spaced apart in the front-rear direction (for example, only the two guide portions 5 on the left side).

[0089] In the above embodiment, the handle 3 is formed of two half bodies (a left member 3L and a right member 3R) connected to each other in the left-right direction. However, the handle 3 may be formed, for example, by connecting half bodies divided in the front-rear direction to each other. Alternatively, the handle 3 may be formed by connecting multiple members divided in other directions. Similarly, the components of the tool body 2 and the manner in which they are connected may be changed as appropriate.

[0090] Further, in view of the spirit of the present disclosure, the following aspects are constructed, at least one of which may be adopted in combination with at least one of the features described in the above-mentioned embodiments, examples, modifications, and claims. [Aspect 1] The second portion is coupled to the first portion so as to be rotatable relative to the first portion. This configuration is efficient because the first and second parts can function as fulcrums for relative rotation between the tool body and the handle in addition to guiding the relative movement between the tool body and the handle in the front-rear direction. [Aspect 2] The tool body and the handle are relatively rotatable about the first portions of the two guide parts or about the second portions of the two guide parts. [Aspect 3] The tool body and the handle are relatively rotatable about an axis passing through the first portions of the two guide portions or about an axis passing through the second portions of the two guide portions. The rotation axis A3 is an example of "an axis passing through the second portions of the two guide parts." [Aspect 4] The other of the first portion and the second portion is configured to move integrally with the elastic member relative to the one of the first portion and the second portion. [Aspect 5] In aspect 4, The elastic member is configured to move in the forward / backward direction relative to one of the first and second parts while the handle moves in the forward / backward direction within a predetermined range relative to the tool body, and to elastically deform in response to the handle moving beyond the predetermined range relative to the tool body. [Aspect 6] The one of the first portion and the second portion is a recess or a through hole extending in the front-rear direction, The other of the first portion and the second portion is a protrusion that protrudes into the recess or the through hole. The guide recess 51 is an example of the "recess" in this embodiment. The guide protrusion 53 is an example of the "protrusion" in this embodiment. [Aspect 7] In the front-rear direction, the one of the first portion and the second portion is longer than the other of the first portion and the second portion. [Aspect 8] In the front-rear direction, the one of the first portion and the second portion is longer than the elastic member. [Aspect 9] The holder is rotatable relative to the one of the first portion and the second portion about an axis extending in a direction perpendicular to the drive shaft. [Aspect 10] the at least one front guide portion includes the drive shaft and includes a pair of guide portions that are symmetrically arranged with respect to a plane that extends in an extension direction of the grip portion, The at least one rear guide portion includes a pair of guide portions disposed symmetrically with respect to the plane. The pair of front guide portions 5F are an example of the "pair of guide portions" of the "at least one front guide portion." The pair of rear guide portions 5R are an example of the "pair of guide portions" of the "at least one rear guide portion." [Aspect 11] a drive mechanism configured to be driven by the motor and to drive the tool bit linearly; The tool body includes a motor housing portion that houses the motor and a drive mechanism housing portion that houses the drive mechanism, The cover portion covers at least a portion of the motor accommodating portion. The drive mechanism 75 is an example of a “drive mechanism.” The motor housing 23 and the drive mechanism housing 21 are examples of a “motor housing” and a “drive mechanism housing,” respectively. [Explanation of symbols]

[0091] 1: hammer drill, 2: tool body, 21: drive mechanism housing, 23: motor housing, 23L: left side, 23R: right side, 231: front end, 25: first spring holder, 251: protrusion, 252: contact surface, 29: bellows, 3: handle, 3L: left side member, 3R: right side member, 5: guide portion, 5F: front guide portion, 5R: rear guide portion, 31: cover portion, 31L: left wall portion, 31R: right wall portion, 33: grip portion, 331: trigger, 335: switch, 337: power cord, 35: first 2 spring receiver, 351: base portion, 352: abutment surface, 354: protrusion, 41: biasing member, 411: first end portion, 412: second end portion, 51: guide recess, 53: guide protrusion, 55: elastic member, 55F: front elastic member, 55R: rear elastic member, 551: notch, 57: holder, 71: motor, 711: motor shaft, 713: fan, 75: drive mechanism, 79: tool holder, 91: tip tool, A1: drive shaft, A2: rotation shaft, A3: pivot shaft, P1: plane, P2: plane

Claims

1. An impact tool configured to linearly drive a tool bit along a drive shaft that defines a front-rear direction, A tool body extending along the drive shaft; a motor housed in the tool body and having a motor shaft rotatable about an axis parallel to the drive shaft; a handle connected to the tool body so as to be rotatable relative to the tool body and movable at least in the front-rear direction, the handle including a cover portion formed at least partially in a cylindrical shape and covering a part of the tool body, and a grip portion extending in a cantilever manner from the cover portion in a direction intersecting the drive shaft; at least one biasing member interposed between the tool body and the handle and biasing the tool body and the handle in directions away from each other in the front-rear direction; (i) a first portion provided on a portion of the tool body covered by the cover portion; (ii) a second portion provided on the cover portion of the handle and connected to the first portion so as to be movable at least in the forward and backward directions relative to the first portion; and (iii) at least one guide portion including an elastic member that elastically connects the first portion and the second portion, The at least one guide portion includes the drive shaft, and includes two guide portions that are arranged symmetrically with respect to a plane extending in an extension direction of the grip portion.

2. The impact tool according to claim 1, An impact tool characterized in that the at least one guide portion includes at least one front guide portion and at least one rear guide portion arranged in a position closer to the grip portion in the fore-and-aft direction than the at least one front guide portion.

3. An impact tool configured to linearly drive a tool bit along a drive shaft that defines a front-rear direction, A tool body extending along the drive shaft; a motor housed in the tool body and having a motor shaft rotatable about an axis parallel to the drive shaft; a handle connected to the tool body so as to be rotatable relative to the tool body and movable at least in the front-rear direction, the handle including a cover portion formed at least partially in a cylindrical shape and covering a part of the tool body, and a grip portion extending in a cantilever manner from the cover portion in a direction intersecting the drive shaft; at least one biasing member interposed between the tool body and the handle and biasing the tool body and the handle in directions away from each other in the front-rear direction; (i) a first portion provided on a portion of the tool body covered by the cover portion; (ii) a second portion provided on the cover portion of the handle and connected to the first portion so as to be movable at least in the forward and backward directions relative to the first portion; and (iii) at least one guide portion including an elastic member that elastically connects the first portion and the second portion, An impact tool, characterized in that one of the first part and the second part is configured to hold the elastic member so that the elastic member can move in the forward / backward direction relative to the one of the first part and the second part.

4. The impact tool according to claim 3, The elastic member is an annular elastic member, The other of the first portion and the second portion includes a protrusion fitted inside the elastic member.

5. The impact tool according to claim 4, An impact tool, characterized in that an inner circumferential surface of the elastic member and an outer circumferential surface of the projection are partially in a non-contact state.

6. An impact tool according to any one of claims 3 to 5, the at least one guide portion further includes a metal holder interposed between the one of the first portion and the second portion and the elastic member and configured to hold the elastic member; The impact tool, wherein the holder is slidable in the front-rear direction relative to the one of the first part and the second part.

7. An impact tool configured to linearly drive a tool bit along a drive shaft that defines a front-rear direction, A tool body extending along the drive shaft; a motor housed in the tool body and having a motor shaft rotatable about an axis parallel to the drive shaft; a handle connected to the tool body so as to be rotatable relative to the tool body and movable at least in the front-rear direction, the handle including a cover portion formed at least partially in a cylindrical shape and covering a part of the tool body, and a grip portion extending in a cantilever manner from the cover portion in a direction intersecting the drive shaft; at least one biasing member interposed between the tool body and the handle and biasing the tool body and the handle in directions away from each other in the front-rear direction; (i) a first portion provided on a portion of the tool body covered by the cover portion; (ii) a second portion provided on the cover portion of the handle and connected to the first portion so as to be movable at least in the forward and backward directions relative to the first portion; and (iii) at least one guide portion including an elastic member that elastically connects the first portion and the second portion, An impact tool characterized in that the at least one guide portion includes at least one front guide portion and at least one rear guide portion arranged in a position closer to the grip portion in the fore-and-aft direction than the at least one front guide portion.

8. The impact tool according to claim 7, An impact tool, wherein an elastic deformation characteristic of the elastic member of the at least one front guide portion and an elastic deformation characteristic of the elastic member of the at least one rear guide portion are different from each other.

9. The impact tool according to claim 8, An impact tool, characterized in that the elastic member of the at least one front guide portion is configured to be less susceptible to elastic deformation than the elastic member of the at least one rear guide portion.

10. An impact tool according to any one of claims 1 to 9, The impact tool, wherein the at least one biasing member includes two biasing members arranged symmetrically with respect to the axis on a plane including the axis of the motor shaft.

11. An impact tool according to any one of claims 1 to 10, An impact tool, characterized in that the at least one guide portion is configured to allow movement of the handle relative to the tool body in the forward / rearward direction and in a direction intersecting the drive shaft.

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