Impact tool

Abstract

An impact tool is provided. The impact tool has a tool body, a motor, a handle, at least one urging member, and at least one guide. The handle is connected to the tool body in a manner that the handle is rotatable relative to the tool body and is movable relative to the tool body in at least a front-rear direction. The handle includes a cover portion that is at least partially formed in a cylindrical shape and covers a portion of the tool body, and a grip portion that extends from the cover portion in a cantilevered manner in a direction intersecting a driving axis. The at least one urging member urges the tool body and the handle in a direction in which the tool body and the handle are moved away from each other in the front-rear direction. The at least one guide has a first portion that is provided to a portion of the tool body covered by the cover portion, and a second portion that is provided to the cover portion of the handle and is connected to the first portion in a manner that the second portion is movable relative to the first portion in at least the front-rear direction. Accordingly, it is possible to contribute to reduction of vibration transmitted to the handle including the cantilevered grip portion in the impact tool.

Description

TECHNICAL FIELD

[0001] The present application relates to an impact tool configured to drive a tip tool in a straight line. BACKGROUND

[0002] In an impact tool that performs a work on a workpiece by driving a tip tool in a straight line along a driving axis, particularly large vibrations are generated in the extension direction of the driving axis. In this regard, various anti-vibration housing configurations have been proposed. For example, in an impact tool (hammer drill) disclosed in Patent Literature 1, a handle including a grip portion is movable in the extension direction of the driving axis and rotatable with respect to a main body portion that houses a motor and a driving mechanism.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: U.S. Patent No. 7886838 Specification SUMMARY

[0006] In the impact tool of Patent Literature 1, both end portions of the elongated grip portion are connected to the main body portion or other portions of the handle. On the other hand, there is an impact tool having a handle including a grip portion having a free end (so-called cantilevered grip portion).

[0007] An object of the present application is to provide a technology that is helpful in reducing vibrations transmitted to a handle including a cantilevered grip portion in an impact tool.

[0008] According to one embodiment of the present application, there is provided an impact tool configured to drive a tip tool in a straight line along a driving axis in a prescribed front-rear direction. The impact tool has a tool main body, a motor, a handle, at least one urging member, and at least one guide portion.

[0009] The tool main body extends along the driving axis. The motor is housed in the tool main body. In addition, the motor has a motor shaft rotatable about an axis parallel to the driving axis. The handle is connected to the tool main body in a manner rotatable with respect to the tool main body and movable with respect to the tool main body at least in the front-rear direction. The handle includes a cover portion and a grip portion. The cover portion is at least partially formed in a cylindrical shape and covers a portion of the tool main body. The grip portion extends in a cantilevered manner from the cover portion in a direction intersecting the driving axis. In addition, the so-called "grip portion extends in a cantilevered manner from the cover portion" means that only one end portion of the grip portion is connected to the cover portion, and the other end portion of the grip portion is a free end.

[0010] At least one force-applying component is located between the tool body and the handle, applying force to the tool body and the handle in a direction that moves them away from each other in the front-rear direction. At least one guide portion has a first portion and a second portion. The first portion is disposed on a portion of the tool body covered by a cover. The second portion is disposed on a cover of the handle. The second portion is connected to the first portion in a manner that allows it to move relative to the first portion at least in the front-rear direction.

[0011] According to the above structure, as vibrations occur in the front-to-back direction during the driving of the top tool (i.e., the main vibrations generated in the direction of extension of the drive axis), the first and second parts of the guide move relative to each other in the front-to-back direction, thereby enabling the handle, including the cantilevered grip, to move relative to the tool body in the front-to-back direction. Furthermore, at least one force-applying component can absorb the vibrations in the front-to-back direction. Therefore, the front-to-back vibrations transmitted from the tool body to the handle can be effectively reduced. Additionally, the transmission of vibrations in the rotational direction can also be reduced by the relative rotation of the tool body and the handle. Attached Figure Description

[0012] Figure 1 This is the left view of the hammer drill, showing the handle in its initial position.

[0013] Figure 2 This is the rear view of the hammer drill.

[0014] Figure 3 This is a left view of a hammer drill with the left side of the handle removed, showing the handle in its initial position.

[0015] Figure 4 yes Figure 1 Sectional view IV-IV.

[0016] Figure 5 yes Figure 2 VV sectional view.

[0017] Figure 6 This is a side view of the elastic component embedded in the cage.

[0018] Figure 7 This is the left view of the hammer drill, showing the handle in the front position.

[0019] Figure 8 This is a left view of a hammer drill with the left side of the handle removed, showing the handle in the front position.

[0020] Figure 9 Is with Figure 4 The corresponding sectional view shows the handle in the forward position.

[0021] Figure 10 Is with Figure 5Corresponding sectional view, showing the handle in a forward position.

[0022] Reference numerals

[0023] 1: hammer drill; 2: tool body; 21: drive mechanism housing portion; 23: motor housing portion; 23L: left side portion; 23R: right side portion; 231: front end portion; 25: first spring receiving portion; 251: protrusion; 252: abutting surface; 29: corrugated portion; 3: handle; 3L: left side member; 3R: right side member; 5: guide portion; 5F: front side guide portion; 5R: rear side guide portion; 31: cover portion; 31L: left wall portion; 31R: right wall portion; 33: grip portion; 331: trigger; 335: switch; 337: power cord; 35: second spring receiving portion; 351: base portion; 352: abutting surface; 354: protrusion; 41: urging member; 411: first end portion; 412: second end portion; 51: guide recess; 53: guide protrusion; 55: elastic member; 55F: front side elastic member; 55R: rear side elastic member; 551: notch; 57: retainer; 71: motor; 711: motor shaft; 713: fan; 75: drive mechanism; 79: tool retainer; 91: tip tool; Al: drive axis; A2: rotation axis; A3: turning axis; PI: plane; P2: plane. DETAILED DESCRIPTION

[0024] In one or more embodiments of the present application, at least one guide portion can be configured to allow the handle to move relative to the tool body in the front-rear direction and in a direction intersecting the drive axis. According to this configuration, at least one guide portion can reduce transmission of vibrations in the front-rear direction and in a direction intersecting the drive axis in addition to reducing transmission of vibrations in the front-rear direction.

[0025] In one or more embodiments of the present application, at least one guide portion can include two guide portions. The two guide portions can be symmetrically disposed with respect to a plane including the drive axis and extending in the extension direction of the grip portion. According to this configuration, stable relative movement of the tool body and the handle can be achieved compared to the case where the guide portion is one.

[0026] In one or more embodiments of the present application, at least one guide portion can further have an elastic member elastically connecting the first portion and the second portion. According to this configuration, vibrations transmitted from the tool body to the handle via the first portion and the second portion can be effectively reduced.

[0027] In one or more embodiments of the present application, one of the first portion and the second portion can be configured to hold the elastic member so as to be movable in the front-rear direction with respect to the one of the first portion and the second portion. According to this configuration, the relative movement of the first portion and the second portion (or the relative movement of the tool body and the handle) in the front-rear direction can be guided by a simple structure.

[0028] In one or more embodiments of the present application, the elastic member can be a ring-shaped elastic member. Also, the other of the first portion and the second portion can include a protrusion that is embedded in the inner side of the elastic member. According to this configuration, the first portion and the second portion can be elastically connected by a simple structure, and the relative movement of the first portion and the second portion (or the relative movement of the tool body and the handle) in a direction that intersects the axis of the protrusion can be allowed.

[0029] In one or more embodiments of the present application, the inner peripheral surface of the elastic member and the outer peripheral surface of the protrusion can be in a partially non-contact state. According to this configuration, the elastic member can be easily elastically deformed compared to a case in which the inner peripheral surface of the elastic member and the outer peripheral surface of the protrusion are in substantially overall contact.

[0030] In one or more embodiments of the present application, the at least one guide portion can further have a holder made of metal that is interposed between the one of the first portion and the second portion and the elastic member, and that holds the elastic member. That is, the elastic member can be held to the one of the first portion and the second portion by the holder. The holder can be slidable in the front-rear direction with respect to the one of the first portion and the second portion. According to this configuration, the elastic member can be easily moved in the front-rear direction compared to a case in which the elastic member is directly held to the one of the first portion and the second portion. In addition, the wear of the elastic member can be suppressed.

[0031] In one or more embodiments of the present application, the at least one guide portion can include at least one front-side guide portion and at least one rear-side guide portion. The at least one rear-side guide portion can be disposed closer to the gripping portion than the at least one front-side guide portion in the front-rear direction. According to this configuration, the relative movement of the tool body and the handle in the front-rear direction can be more stably guided by the different positions of the at least one front-side guide portion and the at least one rear-side guide portion in the front-rear direction.

[0032] In one or more embodiments of the present application, 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 can be different from each other. The elastic deformation characteristics can also be referred to as the degree of difficulty of elastic deformation. According to this structure, 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 of relative rotation of the tool body and the handle.

[0033] In one or more embodiments of the present application, the elastic member of the at least one front guide portion can be configured to be less likely to elastically deform than the elastic member of the at least one rear guide portion. According to this structure, the at least one front guide portion located further from the gripping portion can be used as a fulcrum of relative rotation, and transmission of vibration in the direction of relative rotation of the tool body and the handle to the gripping portion can be effectively reduced.

[0034] In one or more embodiments of the present application, the at least one urging member can include two urging members that are symmetrically arranged with respect to the axis including the axis of the motor shaft. According to this structure, compared to the case where one urging member is provided, the relative movement of the tool body and the handle can be stabilized.

[0035] <EMBODIMENT>

[0036] Hereinafter, with reference to the drawings, Figures 1-10 A hammer drill 1 according to a representative and non-limiting embodiment of the present application will be described. The hammer drill 1 is an example of an electric power tool (so-called impact tool) capable of driving a tip tool 91 in a straight line by impacting the tip tool 91. More specifically, the hammer drill 1 is an electric power tool capable of performing an operation of driving the tip tool 91 in a straight line along a prescribed drive axis Al (hereinafter referred to as an impact operation) and an operation of driving the tip tool 91 to rotate around the drive axis Al (hereinafter referred to as a rotation operation).

[0037] As shown in Figure 1 The outer contour of the hammer drill 1 is mainly formed by a tool body 2 and a handle 3 connected to the tool body 2.

[0038] 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 body case, an outer profile case, or the like. The tool body 2 extends along the drive axis Al of the tip tool 91. In an end portion of the tool body 2 in the extension direction of the drive axis Al (hereinafter simply referred to as the drive axis direction), a tool holder 79 is disposed. On the tool holder 79, the tip tool 91 is detachably mountable. In the tool body 2, mainly the motor 71 and a drive mechanism 75 that is configured to drive the tip tool 91 held to the tool holder 79 by power of the motor 71 are housed. In the present embodiment, the motor 71 is configured such that a rotation axis A2 of a motor shaft 711 that rotates integrally with a rotor extends in parallel with the drive axis Al.

[0039] The handle 3 is formed separately from the tool body 2, and is connected to the tool body 2 in a manner that is rotatable with respect to the tool body 2 and movable in the drive axis direction with respect to the tool body 2. The handle 3 has a grip portion 33 configured to be gripped by a user. The grip portion 33 extends in a manner that protrudes from the other end portion of the tool body 2 in the drive axis direction (i.e., the end portion on the side opposite to the end portion where the tool holder 79 is disposed) in a direction that intersects the drive axis Al (in detail, a direction that is substantially orthogonal to the drive axis Al 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 by the user. In the hammer drill 1, in response to a pressing operation of the trigger 331, the motor 71 is energized, and the drive mechanism 75 is driven, whereby an impact action and / or a rotation action is performed.

[0040] Hereinafter, the detailed structure of the hammer drill 1 will be described. In the following description, for convenience, the extension direction of the drive axis Al (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 where the tool holder 79 is disposed is defined as the front side of the hammer drill 1, and the opposite side (the side where the grip portion 33 is disposed) is defined as the rear side. A direction that is orthogonal to the drive axis Al and substantially corresponds to the extension direction of the grip portion 33 (a direction that is orthogonal to the drive axis Al and the rotation axis A2) is defined as the up-down direction of the hammer drill 1. In the up-down direction, the proximal end portion side of the grip portion 33 is defined as the upper side of the hammer drill 1, and the free end portion side of the grip portion 33 is defined as the lower side of the hammer drill 1. In addition, a direction that is orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction of the hammer drill 1.

[0041] First, the structure of the tool body 2 and the internal configuration thereof will be described.

[0042] The tool body 2 includes a drive mechanism housing portion 21 and a motor housing portion 23.

[0043] As Figure 1As shown, the drive mechanism housing portion 21 is a hollow body that houses the drive mechanism 75. The drive mechanism housing portion 21 constitutes the front half of the tool body 2. The front end portion of the drive mechanism housing portion 21 is formed in a cylindrical shape, and a tool holder 79 is disposed inside the drive mechanism housing portion 21. The portion of the drive mechanism housing portion 21 other than the front end portion is formed in a substantially rectangular cylindrical shape. The drive mechanism 75 includes a motion conversion mechanism and an impact mechanism that perform an impact action, and a rotation transmission mechanism that performs a rotation action, and since these are well-known structures, detailed illustrations and descriptions thereof are omitted. The motion conversion mechanism typically employs a mechanism that converts a rotational motion to a linear motion using a wobble member (e.g., swash bearing, wobble plate / bearing) or a crank mechanism and a piston. The rotation transmission mechanism typically employs a reduction mechanism that includes a plurality of gears.

[0044] In addition, in the present embodiment, the hammer drill 1 has three action modes of a hammering only mode that performs only an impact action, a rotation only mode that performs only a rotation action, and a hammering with rotation mode that simultaneously performs an impact action and a rotation action. The drive mechanism 75 performs an action in accordance with the action mode selected by the user through the mode switching knob, and since these are well-known structures, detailed illustrations and descriptions thereof are omitted.

[0045] As shown in Figs. 1 and 2, the hammer drill 1 includes a tool body 2, a handle 3, and a bit 4. The tool body 2 is a hollow body that houses a drive mechanism 75 and a motor 71. The handle 3 is a hollow body that houses a battery 73. The bit 4 is a tool that is attached to and detached from the tool body 2. Figure 1 , Figure 3 and Figure 4 As shown, the motor housing portion 23 is a hollow body that houses the motor 71. The motor housing portion 23 is formed in a cylindrical shape with a closed rear end. In the present embodiment, the motor housing portion 23 is a single member (member without a joint) that is formed separately from the drive mechanism housing portion 21. The motor housing portion 23 is connected and fixed to the rear end of the drive mechanism housing portion 21 by screws (omitted from illustration), and constitutes the rear half of the tool body 2.

[0046] In the present embodiment, the motor 71 employs an alternating current motor with a commutator. A portion of a motor shaft 711 that extends in the front-rear direction and protrudes forward of the stator is fixed with a fan 713. The fan 713 is disposed inside a front end portion 231 of the motor housing portion 23. The front end portion 231 of the motor housing portion 23 protrudes radially outward of the stator from a portion that extends rearward of the front end portion 231 (a portion that houses the stator, etc.).

[0047] In addition, in the present embodiment, in the motor housing portion 23 of the tool body 2, as a structure for elastically connecting the tool body 2 and the handle 3, two first spring receiving portions (spring seats) 25 (refer to Figure 5 ) and four guide recesses 51 (refer to Figure 4). The elastic connection structure of the tool main body 2 and the handle 3 will be described later in detail.

[0048] Next, the structure of the handle 3 and its internal configuration will be described.

[0049] As shown in Figures 2-4 , in the present embodiment, the handle 3 is formed by left and right members (left and right housings, left and right handle portions) 3L and 3R being connected and fixed to each other in the left-right direction at a plurality of portions by screws (omitted from the drawing). In addition, the handle 3 includes a cover portion 31 and a grip portion 33.

[0050] As shown in Figures 1-4 , the cover portion 31 is formed as a tube shape with a closed rear end portion. The cover portion 31 covers the rear portion of the tool main body 2, more specifically, a large portion 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 respectively disposed on the left side, the right side, the upper side, the lower side, and the rear side of the motor housing portion 23. In addition, the central portions in the up-down direction of the left wall portion 31L and the right wall portion 31R protrude forward more than other portions. In addition, the portion of the rear portion of the tool main body 2 that is not covered by the cover portion 31 is covered by the corrugated portion 29. The corrugated portion 29 is configured to be able to stretch and contract in the front-rear direction in accordance with the relative movement of the tool main body 2 and the handle 3.

[0051] In addition, in the present embodiment, on the cover portion 31, as a structure for elastically connecting the tool main body 2 and the handle 3, two second spring receiving portions (spring seats) 35 (refer to Figure 5 ) and four guide protrusions 53 (refer to Figure 4 ) are provided. The second spring receiving portions 35 are connected to the first spring receiving portions 25 by the force applying members 41. In addition, the guide protrusions 53 are connected to the guide recesses 51 by the elastic members 55 and the retainer 57. In addition, the connection structure of the tool main body 2 and the handle 3 will be described later in detail.

[0052] As shown in Figure 3 , the grip portion 33 is formed as an elongated tube shape. The grip portion 33 extends in a cantilevered manner downward from the cover portion 31. That is, the grip portion 33 extends in the up-down direction at a position lower than the lower end of the tool main body 2. A trigger 331 is disposed at the upper end portion of the grip portion 33. Inside the grip portion 33, a switch 335 is disposed rearward of the trigger 331. The switch 335 is normally held in an 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 supply cord 337 that can be connected to an external alternating-current power supply extends from the lower end of the grip portion 33 (the free end, the protruding end of the handle 3).

[0053] Next, details of the connection structure of the tool main body 2 and the handle 3 will be described.

[0054] First, the details of the connection structure between the first spring receiving part 25 and the second spring receiving part 35 will be explained.

[0055] like Figure 5 As shown, two first spring receiving portions (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 two first spring receiving portions 25 is provided at the lower left rear end of the front end 231. The other of the two first spring receiving portions 25 is provided at the upper right rear end of the front end 231. More specifically, the two first spring receiving portions 25 are arranged on an imaginary plane P1 (see reference). Figure 2 The two first spring supports 25 are symmetrically arranged relative to the rotation axis A2, wherein the plane P1 includes the rotation axis A2 of the motor shaft 711 and extends from the lower left to the upper right when viewed from the rear. That is, the two first spring supports 25 are located at different positions in the vertical and horizontal directions, but at approximately the same position in the front-back direction. In addition, the distance between the rotation axis A2 of the motor shaft 711 and each of the two first spring supports 25 is approximately the same.

[0056] The first spring receiving portion 25 is configured to receive the first end 411 of the two ends of the force-applying member 41 (aggregating against the first end 411). In this embodiment, the force-applying member 41 is a helical compression spring. More specifically, the first spring receiving portion 25 has a protrusion 251 protruding rearward from the rear end face of the front end portion 231. The first end 411 of the force-applying member 41 is fitted onto the protrusion 251 of the first spring receiving portion 25 and abuts against the abutting surface 252 of the rear end face of the front end portion 231 (shoulder portion), which serves as the motor housing portion 23.

[0057] Two second spring receiving portions 35 are respectively provided corresponding to the two first spring receiving portions 25 of the tool body 2. More specifically, one of the two second spring receiving portions 35 is located at the lower left center of the cover portion 31, and the other of the two second spring receiving portions 35 is located at the upper right center of the cover portion 31. More specifically, the two second spring receiving portions 35 are arranged on plane P1 (refer to...). Figure 2 The first springs are arranged symmetrically with respect to the rotation axis A2. Furthermore, two second spring receiving portions 35 are respectively positioned directly behind the two first spring receiving portions 25. That is, the second spring receiving portions 35 are arranged on a straight line passing through the first spring receiving portions 25 and parallel to (extending in the front-rear direction) the rotation axis A2 of the motor shaft 711.

[0058] The second spring receiving portion 35 is configured to receive the second end portion 412 of the two ends of the force-applying member 41 (agreed upon by the second end portion 412). More specifically, the second spring receiving portion 35 has a base portion 351 protruding into the interior of the cover portion 31 and a protrusion 354 protruding forward from the base portion 351. The second end portion 412 of the force-applying member 41 is fitted onto the protrusion 354 and abuts against the abutting surface 352, which serves as the front end face of the base portion 351.

[0059] In this way, the first spring receiving part 25 and the second spring receiving part 35 are elastically connected by the force-applying member 41. The force-applying member 41 is held in a compressed state between the first spring receiving part 25 and the second spring receiving part 35, applying force to the tool body 2 and the handle 3 in a direction that moves them away from each other in the front-back direction. That is, the force-applying member 41 applies force to the tool body 2 and the handle 3 in the forward and backward directions, respectively.

[0060] Next, the connection structure between the guide recess 51 and the guide protrusion 53 will be explained.

[0061] like Figure 3 and Figure 4 As shown, of the four guide recesses 51, two are disposed on the left side portion 23L of the motor housing 23, and two are disposed on the right side portion 23R. More specifically, on the left side portion 23L, two guide recesses 51 are separately disposed in the front-rear direction. On the right side portion 23R, two guide recesses 51 are also separately disposed in the front-rear direction. In addition, the two guide recesses 51 on each of the left side portion 23L and the right side portion 23R are provided at the front and rear ends of the portion of the motor housing 23 covered by the cover portion 31 of the handle 3 in the front-rear direction. Furthermore, the two guide recesses 51 are substantially disposed at the same position in the vertical direction. In other words, when viewed from the side (when viewing the tool body 2 from the left or right), the two guide recesses 51 are disposed on a straight line extending in the front-rear direction. In addition, in this embodiment, when viewed from the side, the two guide recesses 51 are disposed on the rotation axis A2 of the motor shaft 711.

[0062] Additionally, the front pair of guide recesses 51, one on each side, are positioned relative to the imaginary plane P2 (see reference). Figure 2 The planar surfaces P2 are symmetrically arranged, with the plane passing through the center of the hammer drill 1 (tool body 2) in the left-right direction and extending in the up-down direction (the substantial extension direction of the gripping part 33). Plane P2 can also be referred to as an imaginary plane including the drive axis A1 and extending in the up-down direction (a plane including the drive axis A1 and the rotation axis A2). Similarly, the pair of left and right guide recesses 51 on the rear side are also symmetrically arranged with respect to plane P2.

[0063] The four guide recesses 51 are recesses with slightly different shapes but all having depth in the left-right direction, and essentially have the same structure. Specifically, each guide recess 51 is defined by a peripheral wall portion protruding to the left from the left side portion 23L of the motor housing 23, or a peripheral wall portion protruding to the right from the right side portion 23R of the motor housing 23. The length of each guide recess 51 in the front-rear direction is greater than its width in the vertical direction. Furthermore, the front and rear ends of each guide recess 51 are formed into a semi-circle when viewed from the side.

[0064] like Figure 4 As shown, the four guide protrusions 53 correspond to the four guide recesses 51 of the tool body 2, two of which are located on the left wall 31L of the cover 31, and two are located on the right wall 31R. More specifically, on the left wall 31L of the cover 31, two guide protrusions 53 are separately arranged in the front-rear direction. On the right wall 31R, two guide protrusions 53 are also separately arranged in the front-rear direction. In addition, the two guide protrusions 53 on the left wall 31L and the right wall 31R are substantially arranged in the same position in the vertical direction. In other words, when viewed from the side (when viewing the handle 3 from the left or right side), the two guide protrusions 53 are arranged on a straight line extending in the front-rear direction (more specifically, on the rotation axis A2 of the motor shaft 711).

[0065] Additionally, the front pair of guide protrusions 53, on the left and right sides, are positioned relative to plane P2 (see reference). Figure 2 Symmetrical configuration. Similarly, the pair of guide protrusions 53 on the rear side are also symmetrically configured relative to plane P2.

[0066] The four guide protrusions 53 are protrusions with slightly different shapes but all having a circular cross-sectional profile, and essentially have the same structure. Specifically, each guide protrusion 53 protrudes either from the left wall portion 31L to the right (i.e., towards the left side portion 23L of the motor housing portion 23) or from the right wall portion 31R to the left (i.e., towards the right side portion 23R of the motor housing portion 23). The outer diameter of each guide protrusion 53 is smaller than the width of the guide recess 51 in the vertical direction. Furthermore, the length of each guide protrusion 53 is set such that the protruding end of the guide protrusion 53 does not contact the outer surface of the motor housing portion 23 (the bottom surface of the guide recess 51).

[0067] like Figure 4As shown, in this embodiment, the guide protrusion 53 is connected to the guide recess 51 in a manner that allows it to move relative to the guide recess 51 in the front-back direction via an elastic member 55 and a retainer 57. The guide recess 51, guide protrusion 53, elastic member 55, and retainer 57 constitute a guide portion 5 that guides the relative movement of the tool body 2 and handle 3 in the front-back direction. In this embodiment, four guide portions 5 are provided, two on each of the left and right sides of the hammer drill 1. Furthermore, below, when collectively referred to as the four guide portions 5 and when referring indiscriminately to at least one of the four guide portions 5, they are simply referred to as guide portions 5. When referring to at least one of the left and right pairs of guide portions 5 on the front side of the four guide portions 5, it is called the front guide portion 5F; when referring to at least one of the left and right pairs of guide protrusions 53 on the rear side, it is called the rear guide portion 5R.

[0068] like Figure 3 , Figure 4 and Figure 6 As shown, the elastic member 55 is formed as a ring (a short cylindrical shape). In other words, the elastic member 55 is an elastic ring. Furthermore, in this embodiment, all four elastic members 55 have substantially the same shape (inner diameter, outer diameter, thickness). On the inner circumferential surface of each elastic member 55, a plurality of notches 551 are formed at equal intervals along the circumferential direction. Additionally, each notch 551 is formed with a V-shaped cross-section.

[0069] In this embodiment, all four elastic members 55 are made of silicone rubber. However, the elastic deformation characteristics (ease of elastic deformation) of the elastic member 55 of the front guide portion 5F and the elastic member 55 of the rear guide portion 5R are different. More specifically, the elastic member 55 of the front guide portion 5F is configured to be less prone to elastic deformation compared to the elastic member 55 of the rear guide portion 5R. Specifically, the front elastic member 55F is made of silicone rubber with a higher hardness (harder) than the rear elastic member 55R. Furthermore, below, when referring to all four elastic members 55 or when referring to at least one of the four elastic members 55 without distinction, it will be simply referred to as elastic member 55. When referring to the elastic member 55 of the front guide portion 5F, it is called the front elastic member 55F; when referring to the elastic member 55 of the rear guide portion 5R, it is called the rear elastic member 55R.

[0070] like Figure 3 and Figure 4As shown, the retainer 57 is configured to slide in the front-to-back direction within the guide recess 51 of the tool body 2. More specifically, the retainer 57 includes: a circular plate-shaped bottom wall portion having a through hole in its central portion; 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 width of the guide recess 51 in the vertical direction, and is shorter than the length of the guide recess 51 in the front-to-back direction. The retainer 57 can slide in the front-to-back direction within the guide recess 51 when its bottom wall portion is at least partially in contact with the bottom surface of the guide recess 51, and its peripheral wall portion is partially in contact with the surfaces defining the upper and lower ends of the guide recess 51, respectively. In addition, the retainer 57 can be fitted into the semi-circular front and rear ends of the guide recess 51. Furthermore, the retainer 57 can rotate within the guide recess 51 about an axis extending in the left-to-right direction. On the other hand, the vertical movement of the retainer 57 within the guide recess 51 is restricted. In this embodiment, the cage 57 is made of metal (e.g., iron or an iron alloy).

[0071] The elastic member 55 is embedded within the retainer 57 and held in place. A portion of the elastic member 55 normally protrudes outward from the protruding end of the peripheral wall of the retainer 57. Furthermore, the guide protrusion 53 of the handle 3 is embedded inside the elastic member 55. As described above, a notch 551 is formed on the inner peripheral surface of the elastic member 55, thus the inner peripheral surface of the elastic member 55 and the outer peripheral surface of the guide protrusion 53 are in a partially non-contact state. Therefore, compared to the case where the inner peripheral surface of the elastic member 55 and the outer peripheral surface of the guide protrusion 53 are substantially in overall contact, the elastic member 55 is more easily elastically deformed in a direction intersecting the axis of the guide protrusion 53.

[0072] The portion of the elastic member 55 that protrudes outward from the protruding end of the peripheral wall of the retainer 57 abuts against the inner surface of the left wall portion 31L or the right wall portion 31R of the handle 3 (cover portion 31) around the base end of the guide protrusion 53. The top end of the guide protrusion 53 is disposed in the through hole of the bottom wall portion of the retainer 57 and is away from the bottom surface of the guide recess 51 (the outer surface of the motor housing portion 23).

[0073] According to this connection structure, in each guide portion 5, the elastic member 55 is held between the peripheral wall of the retainer 57 and the guide protrusion 53 in a slightly compressed state in the radial direction. Additionally, the elastic member 55 is held between the bottom wall of the retainer 57 and the left wall 31L or the right wall 31R in a slightly compressed state in the left-right direction. In this way, in each of the four guide portions 5, the guide recess 51 and the guide protrusion 53 are elastically connected by the retainer 57 and the elastic member 55. The tool body 2, the retainer 57, and the handle 3 are held in a separated state by the elastic member 55.

[0074] As described above, the urging member 41 urges the tool body 2 and the handle 3 in the front-rear direction to the direction away from each other (i.e., the front and the rear). Therefore, in the initial state, the handle 3 is held at the position where each guide portion 5 is kept in abutment (embedded) against the rear end portion of the guide recess 51 by the urging force of the urging member 41 (position shown in Figure 3 and Figure 4 , which is hereinafter referred to as the initial position).

[0075] On the other hand, when an external force in the front-rear direction that acts in the direction of bringing the tool body 2 and the handle 3 closer to each other (e.g., a pressing force when the user presses the tip tool 91 against the workpiece) is applied, as shown in Figures 7-10 , the handle 3 moves forward from the initial position relative to the tool body 2 while compressing the urging member 41 against the urging force of the urging member 41. At this time, the holder 57 of the guide protrusion 53 connected to the handle 3 via the elastic member 55 slides forward along the guide recess 51. During this period, the elastic member 55 is substantially not compressed from the initial state. The handle 3 moves forward relative to the tool body 2 against the urging force of the urging member 41 to the position where the holder 57 is in abutment (embedded) against the front end portion of the guide recess 51 (position shown in Figure 8 and Figure 9 , which is hereinafter referred to as the front position).

[0076] When the handle 3 moves to the position further forward than the front position, in each guide portion 5, the portion of the elastic member 55 between the front end portion of the guide protrusion 53 and the front end portion of the guide recess 51 (the peripheral wall portion of the holder 57) is elastically deformed (compressed). With the elastic deformation of the elastic member 55, the handle 3 can move to the most forward position further forward than the front position relative to the tool body 2.

[0077] In addition, when the external force in the direction of bringing the tool body 2 and the handle 3 closer to each other is removed, the handle 3 is urged by the urging member 41 to return to the initial position relative to the tool body 2. At this time, in each guide portion 5, the portion of the elastic member 55 between the rear end portion of the guide protrusion 53 and the rear end portion of the guide recess 51 (the peripheral wall portion of the holder 57) can cushion the impact when the holder 57 abuts against the face of the rear end portion of the guide recess 51.

[0078] In addition, when the tool body 2 and the handle 3 relatively move in the left-right direction, the elastic member 55 is compressed to be elastically deformed between the left side portion 23L (the bottom wall portion of the holder 57) of the motor housing portion 23 and the left wall portion 31L of the cover portion 31, or the right side portion 23R (the bottom wall portion of the holder 57) and the right wall portion 31R.

[0079] Further, when the tool body 2 and the handle 3 are relatively moved in the up-and-down direction, the portion of the elastic member 55 between the upper end portion of the guide protrusion 53 and the upper end portion of the guide recess 51 (the peripheral wall portion of the retainer 57) or between the lower end portion of the guide protrusion 53 and the lower end portion of the guide recess 51 (the peripheral wall portion of the retainer 57) is elastically deformed (compressively deformed). At this time, in the present embodiment, the handle 3 can substantially pivot with respect to the tool body 2 about the pair of left and right front-side guide portions 5F (specifically, the guide protrusions 53) as a fulcrum.

[0080] More specifically, as described above, the front-side elastic member 55F of the front-side guide portion 5F is harder than the rear-side elastic member 55R of the rear-side guide portion 5R and is less likely to be elastically deformed. That is, the rear-side elastic member 55R is more likely to be elastically deformed than the front-side elastic member 55F. Therefore, when an external force that relatively moves the tool body 2 and the handle 3 in the up-and-down direction is applied, the handle 3 can pivot with respect to the tool body 2 about the guide protrusions 53 of the pair of left and right front-side guide portions 5F (about the axis of rotation A3 that substantially coincides with the axis of the guide protrusions 53) while elastically deforming the rear-side elastic member 55R more greatly. The same applies in the case where an external force that relatively rotates the tool body 2 and the handle 3 about an axis extending in the left-and-right direction is applied.

[0081] Further, although less likely to be elastically deformed than the rear-side elastic member 55R, the front-side elastic member 55F can also be elastically deformed. Therefore, in the front-side guide portion 5F, the guide protrusion 53 can move with respect to the retainer 57 and the guide recess 51 (and the tool body 2) in a direction (for example, the front-and-rear direction, the up-and-down direction) that intersects the axis of the guide protrusion 53 along with the elastic deformation of the front-side elastic member 55F. That is, the pivot axis A3 of the handle 3 with respect to the tool body 2 can vary in accordance with the elastic deformation of the elastic member 55.

[0082] Next, the operation of the tool body 2 and the handle 3 at the time of the impact operation will be described.

[0083] When the driving mechanism 75 performs the impact action, the largest vibration in the driving axis direction (front-rear direction) of the tool body 2 is generated by driving the tip tool 91 along the driving axis Al. With this vibration, in each guide portion 5, the retainer 57 connected to the guide protrusion 53 by the elastic member 55 slides in the front-rear direction within the guide recess 51. In addition, the guide protrusion 53 is also able to move in the front-rear direction within the retainer 57 by elastic deformation of the elastic member 55. Thus, the handle 3 moves in the front-rear direction within a range between the initial position and the frontmost position with respect to the tool body 2. During this period, the urging member 41 extends and contracts with the relative movement of the tool body 2 and the handle 3, whereby the transmission of vibration to the handle 3 is alleviated. Also, when the handle 3 moves between the front position and the frontmost position, the transmission of vibration to the handle 3 is effectively alleviated by elastic deformation of the elastic member 55 in addition to the extension and contraction of the urging member 41. In this way, in the present embodiment, the extension and contraction of the urging member 41, the movement and elastic deformation of the elastic member 55 are utilized to effectively alleviate the transmission of vibration in correspondence with the magnitude of vibration in the front-rear direction.

[0084] In addition, in the present embodiment, the two pairs of guide portions 5 (one pair of front-side guide portions 5F and one pair of rear-side guide portions 5R) are provided separately in the front-rear direction, and thus the relative movement of the tool body 2 and the handle 3 in the front-rear direction is stably guided.

[0085] Also, the relative movement of the guide recess 51 and the guide protrusion 53 (and thus the relative movement of the tool body 2 and the handle 3) in the front-rear direction is stably guided by the simple structure of the retainer 57 that is slidable within the guide recess 51. Also, the retainer 57 is made of metal, and thus is able to smoothly slide within the guide recess 51 made of synthetic resin. In addition, the wear of the elastic member 55 is also able to be suppressed compared to the case where the elastic member 55 connected to the guide protrusion 53 directly slides within the guide recess 51.

[0086] In addition, in the present embodiment, the tool body 2 and the handle 3 are urged by the two urging members 41. Thus, the relative movement of the tool body 2 and the handle 3 is able to be stabilized compared to the case where one spring is provided. In particular, the two urging members 41 are disposed at positions that are symmetrical with respect to the rotational axis A2 of the motor shaft 711 and different in the up-down direction and the left-right direction. Thus, when the handle 3 moves in the front-rear direction with respect to the tool body 2, the handle 3 is able to be suppressed from being uselessly tilted in the up-down direction or the left-right direction.

[0087] Further, in the present embodiment, the handle 3 is able to rotate with respect to the tool body 2 with a pair of the front side guide portions 5F (guide protrusions 53 (retainers 57)) as a fulcrum. Therefore, it is also possible to effectively reduce the transmission of the vibration in the relative rotation direction of the tool body 2 and the handle 3. In the present embodiment, by setting the elastic deformation characteristics of the elastic member 55 described above, the front side guide portions 5F are set as the relative rotation fulcrum of the tool body 2 and the handle 3. The front side guide portions 5F are located further from the grip portion 33 than the rear side guide portions 5R. In particular, in the present embodiment, the guide recesses 51 and the guide protrusions 53 of the front side guide portions 5F are respectively arranged at the most front position in the portions of the motor housing portion 23 and the cover portion 31 that overlap each other. Therefore, it is possible to effectively reduce the transmission of the vibration in the relative rotation direction of the tool body 2 and the handle 3 to the grip portion 33.

[0088] Further, in the present embodiment, in each of the guide portions 5, the guide recess 51 and the guide protrusion 53 are connected by the elastic member 55. Therefore, compared with a structure in which the guide recess 51 and the guide protrusion 53 are directly connected (contacted), it is possible to effectively reduce the vibration transmitted from the tool body 2 to the handle 3 via the guide recess 51 and the guide protrusion 53.

[0089] Further, the annular elastic member 55 that is sleeved around the outer periphery of the guide protrusion 53 also allows the relative movement of the tool body 2 and the handle 3 in the direction intersecting the axis of the guide protrusion 53 and in the extension direction of the axis of the guide protrusion 53 (i.e., the left-right direction) by elastic deformation. In the tool body 2, vibrations in other directions (for example, the up-down direction, the left-right direction) other than the vibrations in the front-rear direction also occur. The connection structure using the elastic member 55 of the present embodiment is able to appropriately cope with vibrations in all directions other than the front-rear direction with the elastic deformation of the elastic member 55.

[0090] The following shows the correspondence between the structures (features) of the embodiments and the structures (features) of the present application. However, the structures (features) of the embodiments are merely examples and do not limit the structures (features) of the present application or the present invention.

[0091] The hammer drill 1 is an example of an "impact tool". The drive axis Al is an example of a "drive axis". 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 rotation axis A2 is an example of an "axis of the motor shaft". 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 force applying member 41 is an example of a "force applying 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".

[0092] The elastic member 55 is an example of an "elastic member". The guide recess 51 is an example of "one of the first portion and the second portion". The guide protrusion 53 is an example of "the other of the first portion and the second portion" and a "protrusion". The retainer 57 is an example of a "retainer". The front side guide portion 5F is an example of a "front side guide portion". The rear side guide portion 5R is an example of a "rear side guide portion". The front side elastic member 55F is an example of an "elastic member of the front side guide portion". The rear side elastic member 55R is an example of an "elastic member of the rear side guide portion". The plane PI is an example of a "plane including an axis of the motor shaft".

[0093] <Modification Examples>

[0094] In addition, the above-described embodiment is merely an example, and the impact tool according to the present application is not limited to the example hammer drill 1. For example, the following non-limiting modifications can be added. In addition, at least one of these modifications can be used in combination with at least one of the structures (features) described in the hammer drill 1 and the technical solutions.

[0095] In the above-described embodiment, the hammer drill 1 is exemplified as an impact tool, but the features of the present application can also be applied to other electric power tools capable of performing an impact operation (for example, an electric hammer capable of performing only an impact operation without performing a rotation operation). In addition, the hammer drill 1 can have only two operation modes of an impact mode and a rotation mode. The structures and configurations of the motor 71 and the drive mechanism 75 can be appropriately changed according to the impact tool to which the features of the present application are applied. For example, the motor 71 can also employ a DC motor (for example, a brushless DC motor). In this case, for example, a battery mounting portion of a detachable rechargeable battery (also referred to as a battery pack) can be provided on the tool body 2 or the handle 3.

[0096] The connection structure of the tool body 2 and the handle 3 can be appropriately changed. Hereinafter, modification examples regarding the connection structure of the tool body 2 and the handle 3 are exemplified.

[0097] For example, the biasing member that biases the tool body 2 and the handle 3 in a direction in which they are distanced from each other in the front-rear direction is not limited to the biasing member 41. For example, a spring different in kind from the coil compression spring (for example, a tension coil spring, a leaf spring, a torsion spring, or the like) can also be employed. Alternatively, an elastic member other than a spring, such as rubber or synthetic resin, can also be employed. In addition, the number and positions of the biasing member 41 are not limited to those exemplified in the above-described embodiment. For example, the biasing member 41 can be provided only one on the plane P2. Three or more biasing members 41 can also be provided. In addition, the structures of the first spring receiving portion 25 and the second spring receiving portion 35 that receive the end portions of the biasing member 41 can be appropriately changed according to the kind, position, and the like of the biasing member employed.

[0098] Further, the configuration that guides 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 can be appropriately changed. For example, the guide recess 51 can also not be a bottomed recess, but an opening (through-hole) that penetrates the wall portion of the motor housing portion 23. Further, a recess or a through-hole that extends in the front-rear direction can be provided in the cover portion 31 of the handle 3, and a protrusion can be provided in the portion of the tool body 2 that is covered by the cover portion 31, in place of the guide portion 5. Also, the protrusion of the tool body 2 can be movable in at least the front-rear direction along the recess or the through-hole of the cover portion 31.

[0099] Further, the kind, shape, number, position, and the like of the elastic member 55 are not limited to the above-described examples. For example, the elastic member 55 can also be formed of a rubber different from the silicon rubber, or a synthetic resin that is elastically deformable (for example, a foamed body of a synthetic resin). Further, an elastic member 55 of another shape can be used in place of the circular ring-shaped elastic member 55. Alternatively, a plurality of elastic members can be arranged between the outer peripheral surface of the guide protrusion 53 and the peripheral wall portion of the retainer 57. The shape of the retainer 57 can also be changed in accordance with the change of the elastic member 55 and / or the guide recess 51. Further, the material of the retainer 57 is not limited to metal, and can be formed of a synthetic resin different from the tool body 2, for example.

[0100] Further, the retainer 57 can be omitted, and the elastic member 55 can be directly held to the guide recess 51 in a manner slidable in the front-rear direction. In this case, it is preferable that at least the surface of the elastic member 55 that slides in the guide recess 51 be provided with a coating that facilitates sliding and suppresses wear. Alternatively, an elastic member having an opening extending linearly in the front-rear direction can be embedded inside the guide recess 51. Further, the guide protrusion 53 can be made slidable in the front-rear direction within the opening of the elastic member.

[0101] The elastic deformation characteristics (degree of difficulty of elastic deformation) of the front-side elastic member 55F of the front-side guide portion 5F and the rear-side elastic member 55R of the rear-side guide portion 5R can also be different depending on the kind or the shape. For example, the front-side elastic member 55F and the rear-side elastic member 55R can be formed of a rubber or a synthetic resin having different elastic moduli from each other in the same shape. Alternatively, the front-side elastic member 55F and the rear-side elastic member 55R can be formed of the same rubber or synthetic resin in the same inner diameter and outer diameter, and a plurality of notches 551 can be formed only on the rear-side elastic member 55R. In order to make the inner peripheral surface of the elastic member 55 and the outer peripheral surface of the guide protrusion 53 be in a partial non-contact state, a plurality of protrusions that protrude to the radial outside can be provided on the outer peripheral surface of the guide protrusion 53 in place of the notches 551.

[0102] The configuration of the guide portions 5 is not limited to the above-described example. For example, in the above-described embodiment, the two guide portions 5 provided on the left and right sides of the hammer drill 1 are located on a straight line extending in the front-rear direction (at the same position in the up-down direction) in a side view, but can be configured at different positions in the up-down direction. Also, the two guide portions 5 can be configured on a straight line extending in the front-rear direction at a position above or below the rotational axis A2 of the motor shaft 711 in a side view. Also, the positions of the two guide portions 5 can be appropriately changed within a region in which the tool body 2 (motor housing portion 23) and the handle 3 (cover portion 31) overlap, but it is preferable that they be as far apart as possible in the front-rear direction.

[0103] The hammer drill 1 can have at least one guide portion 5, and the number of guide portions 5 is not limited to the above-described example (four). For example, the hammer drill 1 can have only one pair of guide portions 5 (for example, only one pair of front-side guide portions 5F) on the left and right sides. Also, in the case where one pair of guide portions 5 is provided on the left and right sides, the handle 3 can be rotated relative to the tool body 2 by the rotation of the holder 57 together with the elastic member 55 and the guide protrusion 53 in the guide recess 51 in each guide portion 5. Also, the hammer drill 1 can have only two guide portions 5 (for example, two guide portions 5 on the left side) configured separately in the front-rear direction.

[0104] In the above-described embodiment, the handle 3 is formed by two split bodies (left-side member 3L and right-side member 3R) connected to each other in the left-right direction. However, the handle 3 can be formed by split bodies connected to each other in the front-rear direction, for example. Alternatively, the handle 3 can be formed by a plurality of members connected together in other directions. Also, the structural members of the tool body 2 and the manner in which they are connected can be appropriately changed.

[0105] Also, the following modes are constructed in view of the gist of the present application. At least one of the following modes can be used in combination with at least one of the features described in the above-described embodiments, examples, modified examples, and technical solutions.

[0106] [Mode 1] The second portion is connected to the first portion in a manner that allows rotation relative to the first portion.

[0107] According to this structure, the first portion and the second portion can function as a fulcrum for the relative rotation of the tool body and the handle in addition to guiding the relative movement of the tool body and the handle in the front-rear direction, and thus is more efficient.

[0108] [Mode 2] The tool body and the handle can be relatively rotated with the first portion of each of the two guide portions as a fulcrum, or with the second portion of each of the two guide portions as a fulcrum.

[0109] [Mode 3] The tool body and the handle are relatively rotatable about an axis that passes through the first portion of each of the two guide portions, or about an axis that passes through the second portion of each of the two guide portions.

[0110] The rotation axis A3 is an example of an "axis that passes through the second portion of each of the two guide portions".

[0111] [Mode 4] The other of the first portion and the second portion is configured to move relative to the one of the first portion and the second portion integrally with the elastic member.

[0112] [Mode 5] In Mode 4, the elastic member is configured to move relative to the one of the first portion and the second portion in the front-rear direction during movement of the handle relative to the tool body in the front-rear direction within a prescribed range, and to elastically deform as the movement of the handle relative to the tool body exceeds the prescribed range.

[0113] [Mode 6] The one of the first portion and the second portion is a recess or a through-hole that extends in the front-rear direction,

[0114] The other of the first portion and the second portion is a protrusion that protrudes into the recess or the through-hole.

[0115] The guide recess 51 is an example of the "recess" of the present mode. The guide protrusion 53 is an example of the "protrusion" of the present mode.

[0116] [Mode 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.

[0117] [Mode 8] In the front-rear direction, the one of the first portion and the second portion is longer than the elastic member.

[0118] [Mode 9] The retainer is rotatable relative to the one of the first portion and the second portion about an axis that extends in a direction orthogonal to the drive axis.

[0119] [Mode 10] The at least one front-side guide portion includes a pair of guide portions that are symmetrically arranged relative to a plane that includes the drive axis and extends in the extension direction of the grip portion,

[0120] The at least one rear-side guide portion includes a pair of guide portions that are symmetrically arranged relative to the plane.

[0121] The pair of front side guide portions 5F is an example of the "pair of guide portions" of the "at least one front side guide portion". The pair of rear side guide portions 5R is an example of the "pair of guide portions" of the "at least one rear side guide portion".

[0122] [Mode 11] Further, a driving mechanism is provided, which is configured to be driven by the motor and to drive the tip tool in a linear manner,

[0123] The tool body includes a motor housing portion that houses the motor and a driving mechanism housing portion that houses the driving mechanism,

[0124] The cover portion covers at least a portion of the motor housing portion.

[0125] The driving mechanism 75 is an example of the "driving mechanism". The motor housing portion 23 and the driving mechanism housing portion 21 are examples of the "motor housing portion" and the "driving mechanism housing portion", respectively.

Claims

1. An impact tool configured to drive a tip tool in a straight line along a drive axis in a prescribed forward-rearward direction, characterized by comprising a tool body, a motor, a handle, at least one urging member, and at least one guide portion, wherein the tool body extends along the drive axis; the motor is housed in the tool body and has a motor shaft rotatable about an axis parallel to the drive axis; the handle is connected to the tool body in a manner that the handle is rotatable relative to the tool body and is movable at least in the forward-rearward direction, the handle includes a cover portion formed at least partially in a cylindrical shape and covering a portion of the tool body, and a grip portion extending from the cover portion in a cantilevered manner in a direction intersecting the drive axis; the at least one urging member is interposed between the tool body and the handle and urges the tool body and the handle in a direction in which the tool body and the handle are moved away from each other in the forward-rearward direction; the at least one guide portion has a first portion provided to a portion of the tool body covered by the cover portion and a second portion provided to the cover portion of the handle and connected to the first portion in a manner that the second portion is movable relative to the first portion at least in the forward-rearward direction; the at least one guide portion further has an elastic member elastically connecting the first portion and the second portion; the at least one guide portion includes at least one front-side guide portion and at least one rear-side guide portion, the at least one rear-side guide portion is disposed closer to the grip portion than the at least one front-side guide portion in the forward-rearward direction; and elastic deformation characteristics of the elastic member of the at least one front-side guide portion and elastic deformation characteristics of the elastic member of the at least one rear-side guide portion are different from each other.

2. The impact tool according to claim 1, characterized in that the at least one guide portion is configured to allow the handle to be moved relative to the tool body in the forward-rearward direction and in a direction intersecting the drive axis.

3. The impact tool according to claim 1, characterized in that the at least one guide portion includes two guide portions, and the two guide portions are symmetrically disposed with respect to a plane including the drive axis and extending in a direction of extension of the grip portion.

4. The impact tool according to claim 2, characterized in that the at least one guide portion includes two guide portions, and the two guide portions are symmetrically disposed with respect to a plane including the drive axis and extending in a direction of extension of the grip portion.

5. The impact tool according to claim 1, characterized in that one of the first portion and the second portion is configured to hold the elastic member so as to be movable relative to the one of the first portion and the second portion in the forward-rearward direction.

6. The impact tool according to claim 5, characterized in that the elastic member is an annular elastic member, and the other of the first portion and the second portion includes a protrusion embedded in an inner side of the elastic member. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 7. The impact tool according to claim 6, wherein the inner peripheral surface of the elastic member and the outer peripheral surface of the protrusion are in a partial non-contact state.

8. The impact tool according to claim 5, wherein the at least one guide portion further has a retainer of metal interposed between the one of the first and second portions and the elastic member for retaining the elastic member, the retainer is slidable relative to the one of the first and second portions in the front-rear direction.

9. The impact tool according to claim 6, wherein the at least one guide portion further has a retainer of metal interposed between the one of the first and second portions and the elastic member for retaining the elastic member, the retainer is slidable relative to the one of the first and second portions in the front-rear direction.

10. The impact tool according to claim 7, wherein the at least one guide portion further has a retainer of metal interposed between the one of the first and second portions and the elastic member for retaining the elastic member, the retainer is slidable relative to the one of the first and second portions in the front-rear direction.

11. The impact tool according to claim 1, wherein the elastic member of the at least one front-side guide portion is configured to be less likely to be elastically deformed than the elastic member of the at least one rear-side guide portion.

12. The impact tool according to any one of claims 1 to 11, wherein the at least one force applying member includes two force applying members, the two force applying members being arranged symmetrically relative to the axis in a plane including the axis of the motor shaft.

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