Work equipment

Abstract

To improve reliability.SOLUTION: An upper connection mechanism 50 of a hammer drill 10 is formed including a handle connection part 54 and a body connection part 52. The handle connection part 54 is connected to the body connection part 52 in a manner that enables relative movement between the parts in an anteroposterior direction. Further, the handle connection part 54 is provided with a metallic protector plate 56. The protector plate 56 is located adjacent to an outer side of the body connection part 52 in a lateral direction. The structure allows the protector plate 56 to be guided by the body connection part 52 when the handle housing 24 moves relative to the body housing 22 in the anteroposterior direction. Thus, the protector plate 56 functions as a member for protecting the handle connection part 54. Therefore, wear of the handle connection part 54 of the handle housing 24 can be inhibited compared with a structure in which the protector plate 56 is omitted.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] The power tool (working machine) described in Patent Document 1 below has a housing that constitutes the outer shell of the power tool, which includes a main body housing and a handle housing, and the handle housing is connected to the main body housing so as to be relatively movable in the front-rear direction. Also, an elastic body such as rubber is provided between the handle housing and the main body housing. Thereby, vibrations and the like generated during drilling can be absorbed by the elastic body. Therefore, the workability of the power tool can be improved.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in a working machine such as a power tool, usually, the main body housing and the handle housing are made of a resin material. Therefore, due to the relative movement of the handle housing with respect to the main body housing, the connecting portion between the main body housing and the handle housing may wear. In this case, due to the wear of the connecting portion, play may occur between the main body housing and the handle housing, and the relative movement of the handle housing with respect to the main body housing may not be performed smoothly. That is, the reliability of the power tool may decrease.

[0005] In consideration of the above facts, an object of the present invention is to provide a working machine capable of improving reliability.

Means for Solving the Problems

[0006] One or more embodiments of the present invention include: a drive unit; a resin main housing housing the drive unit; a tip tool extending from the main housing and operated by the driving force of the drive unit; a resin handle having a gripping portion for the operator to grasp; a connecting portion provided on the handle and connected to the main housing so as to be movable relative to it; a connected portion provided on the main housing and connected to the connecting portion; and a metal protector provided on one of the connecting portion and the connected portion, such that the other of the connecting portion and the connected portion slides when the handle moves relative to the main housing. One of the connecting portion and the connected portion is provided with an axial fixed shaft extending in a first direction, and the other of the connecting portion and the connected portion is provided with a mating portion that is mated to the fixed shaft and supports the fixed shaft so as to be movable relative to it in a second direction perpendicular to the first direction. It is a work machine.

[0007] One or more embodiments of the present invention are as described above. Fixed axis The protector is locked in place. ru It is a work machine.

[0008] One or more embodiments of the present invention provide a protector having a retaining portion configured to be elastically deformable, wherein the retaining portion is Fixed axis Pressing the elastically deformed state against the above Fixed axis It is a piece of work equipment that is secured to it.

[0010] One or more embodiments of the present invention are provided in the connecting portion, and the handle is composed of a handle member divided in the first direction. Fixed axis The handle members are fixed to each other. Ru's work It is a business opportunity.

[0011] One or more embodiments of the present invention are work machines in which the protectors are provided on both sides in the first direction with respect to the connected portion.

[0012] One or more embodiments of the present invention are work machines in which the protector has a pair of restricting parts, and a part of the connected part abuts against the restricting parts, thereby limiting the range of movement of the connected part in the second direction.

[0013] One or more embodiments of the present invention are The device comprises a drive unit, a resin main housing housing the drive unit, a tip tool extending from the main housing and operated by the driving force of the drive unit, a resin handle having a gripping portion for the operator to grasp, a connecting portion provided on the handle and connected to the main housing so as to be movable relative to it, a connected portion provided on the main housing and connected to the connecting portion, and a metal protector provided on one of the connecting portion and the connected portion, such that the other of the connecting portion and the connected portion slides when the handle moves relative to the main housing, wherein one of the connecting portion and the connected portion A rotating shaft extending in a first direction is provided, the other of the connecting portion and the connected portion is formed in a cylindrical shape with the first direction as the axial direction and is a support cylinder portion that rotatably supports the rotating shaft, the main body housing houses a controller that controls the drive unit, the handle is provided with a power supply unit that supplies power to the drive unit, the pair of rotating shafts and the support cylinder portion are provided spaced apart in the first direction, and the main body housing is provided with an insertion portion between the pair of rotating shafts and the support cylinder portion through which wiring connecting the power supply unit and the controller is inserted. a working machine. One or more embodiments of the present invention are working machines in which the protector comprises a cylindrical main body attached to the rotating shaft and a flange extending radially outward from one end of the main body and positioned opposite the support cylinder in the first direction.

[0014] One or more embodiments of the present invention are the above-mentioned Support cylinder part Inside, a cylindrical elastic body is provided on the radially outer side of the rotating shaft, and the elastic body biases the rotating shaft inward in the radial direction. It is a working machine.

Advantages of the Invention

[0016] According to one or more embodiments of the present invention, reliability can be improved.

Brief Description of the Drawings

[0017] [Figure 1] It is a side view seen from the right showing the hammer drill according to this embodiment. [Figure 2] It is a cross-sectional view seen from the right showing the inside of the hammer drill shown in FIG. 1. [Figure 3] It is a cross-sectional view seen from the top showing the upper connecting mechanism of the hammer drill shown in FIG. 2 (cross-sectional view taken along line 3-3 in FIG. 2). [Figure 4] It is an exploded perspective view showing a state in which the handle member on the right side is removed from the main body housing in the upper connecting mechanism shown in FIG. 3. [Figure 5] It is a cross-sectional view seen from the top showing the lower connecting mechanism of the hammer drill shown in FIG. 2 (cross-sectional view taken along line 5-5 in FIG. 2). [Figure 6] It is a cross-sectional view seen from the rear showing the lower connecting mechanism of the hammer drill shown in FIG. 2 (cross-sectional view taken along line 6-6 in FIG. 2). [Figure 7] It is a side view showing a state in which the handle housing of the hammer drill shown in FIG. 1 has moved to the pushed-in position. [Figure 8] It is a cross-sectional view corresponding to FIG. 3 showing the state of the upper connecting mechanism at the pushed-in position of the handle housing. [Figure 9]It is a cross-sectional view corresponding to FIG. 5 showing the state of the lower connection mechanism at the pushed-in position of the handle housing.

Embodiments for Carrying out the Invention

[0018] Hereinafter, the hammer drill 10 as a working machine according to the present embodiment will be described with reference to the drawings. The arrows UP, FR, and RH appropriately shown in the drawings indicate the upper side, front side, and right side of the hammer drill 10. In the following description, when the up-down, front-rear, and left-right directions are used for explanation, unless otherwise specified, they indicate the up-down direction, front-rear direction, and left-right direction of the hammer drill 10.

[0019] As shown in FIGS. 1 and 2, the hammer drill 10 is configured as a power tool for performing drilling work or the like on a workpiece. The hammer drill 10 includes a housing 20, a motor 37 as a drive unit, and a transmission mechanism 40 that transmits the driving force of the motor 37 to the tip tool T. Hereinafter, each component of the hammer drill 10 will be described.

[0020] (Regarding the housing 20) The housing 20 constitutes the outer shell of the hammer drill 10. The housing 20 includes a main body housing 22 that constitutes the front part of the housing 20 and a handle housing 24 as a handle that constitutes the rear part of the housing 20.

[0021] The main housing 22 is composed of multiple housing members and is formed in a roughly inverted L-shape when viewed from the right side. The handle housing 24 extends in the vertical direction, and its upper and lower ends are bent forward and connected to the rear end of the main housing 22. Specifically, the upper end of the handle housing 24 is connected to the upper end of the main housing 22 by an upper connecting mechanism 50 so as to be able to move relative to it in the front-rear direction. The lower end of the handle housing 24 is connected by a lower connecting mechanism 60 so as to be able to rotate axially in the left-right direction. The handle housing 24 is initially positioned (as shown in Figure 1), and when the operator pushes the handle housing 24 forward during drilling, the handle housing 24 moves to a pushed-in position (as shown in Figure 7), which is displaced forward from the initial position. The upper connecting mechanism 50 and the lower connecting mechanism 60 will be described later.

[0022] The handle housing 24 is composed of two handle members 24L and 24R, which are divided in the left-right direction. The handle housing 24 is formed by assembling the handle members 24L and 24R together. The portion of the handle housing 24 that extends vertically is configured as a gripping portion 24A that is grasped by the operator. A trigger 30 is provided at the upper end of the gripping portion 24A. The trigger 30 protrudes forward from the handle housing 24 and is configured to be operated by pulling it backward. As shown in Figure 2, a switch mechanism 31 is provided on the gripping portion 24A behind the trigger 30. The switch mechanism 31 has a switch (not shown) that is operated by the trigger 30. This switch is electrically connected to a controller 32 by wiring 34 routed inside the handle housing 24 and outputs an output signal to the controller 32 according to the operating state of the trigger 30. The controller 32 is housed at the lower end of the main body housing 22. A battery pack 33, which serves as the power supply unit, is mounted at the lower end of the handle housing 24, and the battery pack 33 is connected to a terminal unit 35 provided on the handle housing 24. The terminal unit 35 is electrically connected to the controller 32 by wiring 36, and power is supplied from the battery pack 33 to the motor 37 and the controller 32, which will be described later.

[0023] (Regarding motor 37) The motor 37 is configured as a three-phase brushless motor and is housed in the lower rear part of the main body housing 22. Specifically, the motor 37 is positioned above the controller 32 and is electrically connected to the controller 32. The motor 37 has an output shaft 37A whose axis is oriented vertically. The lower end of the output shaft 37A is rotatably supported by a motor bearing 38 fixed to the main body housing 22, and the upper end portion of the output shaft 37A is rotatably supported by a motor bearing 39 held at the lower end of the inner housing 41 in the transmission mechanism 40, which will be described later. A pinion gear 37B is formed at the upper end of the output shaft 37A.

[0024] (Regarding transmission mechanism 40) The transmission mechanism 40 is configured as a mechanism that transmits the rotational force of the motor 37 to the tip tool T and drives the tip tool T. The transmission mechanism 40 consists of an inner housing 41, an intermediate shaft 42, and a transmission unit 47, and is housed in the upper part of the main body housing 22.

[0025] The inner housing 41 is formed in a roughly bottomed elliptical shape that opens to the front. The inner housing 41 is positioned above the motor 37 so as to partition the upper rear end of the main housing 22 in the front-rear direction. A motor bearing 39 is held at the lower end of the inner housing 41, and the output shaft 37A of the motor 37, supported by the motor bearing 39, is located inside the inner housing 41.

[0026] The intermediate shaft 42 is formed in a substantially cylindrical shape with its axial direction in the front-rear direction, and its front and rear ends are rotatably supported by bearings 43 and 44 fixed to the main body housing 22. A bevel gear 45 is integrally rotatably mounted on the rear end of the intermediate shaft 42, and the bevel gear 45 meshes with the pinion gear 37B of the output shaft 37A. As a result, when the motor 37 is driven and the output shaft 37A rotates, the intermediate shaft 42 rotates around its own axis. A motion conversion member 46 is provided on the intermediate shaft 42, and the motion conversion member 46 is configured to convert the rotational motion of the intermediate shaft 42 into reciprocating motion in the front-rear direction, thereby applying a striking force to the transmission unit 47, which will be described later.

[0027] The transmission unit 47 extends in the front-rear direction above the intermediate shaft 42. The tip tool T is attached to the front end of the transmission unit 47. The tip tool T is formed in a substantially cylindrical shape with the front-rear direction as its axial direction, and the rear end of the tip tool T is attached to the transmission unit 47. The transmission unit 47 is also connected to the intermediate shaft 42. As a result, the rotational force of the motor 37 is transmitted to the tip tool T, causing the tip tool T to rotate around its own axis and perform drilling on the workpiece. In addition, the impact force from the motion conversion member 46 is applied to the tip tool T via the transmission unit 47.

[0028] (Regarding the upper connecting mechanism 50) As shown in Figures 2 to 4, the upper connecting mechanism 50 is configured as a mechanism that connects the upper end of the handle housing 24 to the upper end of the rear end of the main body housing 22. The upper connecting mechanism 50 connects the upper end of the handle housing 24 to the main body housing 22 so that it can move relative to it in the front-rear direction (second direction). The upper connecting mechanism 50 is composed of a main body connecting part 52 provided on the main body housing 22 as a connected part, a handle connecting part 54 provided on the handle housing 24 as a connecting part, a pair of protector plates 56 as left and right protectors, and a biasing spring 58.

[0029] The main body connecting portion 52 is formed in the shape of a substantially rectangular plate with the vertical direction being the thickness direction, and protrudes to the rear from the upper end of the main body housing 22. The main body connecting portion 52 is composed of a first main body connecting portion 52A which constitutes the front part of the main body connecting portion 52, and a second main body connecting portion 52B which constitutes the rear end of the main body connecting portion 52. The width dimension (horizontal dimension) of the second main body connecting portion 52B is set to be smaller than the width dimension of the first main body connecting portion 52A, and the left and right sides of the second main body connecting portion 52B are positioned one step lower in the left and right direction relative to the left and right sides of the first main body connecting portion 52A.

[0030] A mating hole 52C, which serves as a mating part, is formed through the rear end of the first main body connecting portion 52A in the left-right direction. When viewed from the left-right direction, the mating hole 52C is formed in the shape of a substantially rectangular elongated hole with the front-rear direction as the longitudinal direction. Both left-right ends of the rear wall of the first main body connecting portion 52A are configured as stopper portions 52D, and the front surface of the stopper portion 52D is positioned one step lower to the rear of the rear surface of the mating hole 52C.

[0031] On the left and right sides of the second main body connecting portion 52B, a material relief portion 52E is formed in the middle of the vertical direction. The material relief portion 52E is formed in the shape of a groove that extends in the front-rear direction and opens outward in the left-right direction. In the left-right center of the second main body connecting portion 52B, a spring housing portion 52F for housing a biasing spring 58, which will be described later, is formed. The spring housing portion 52F is formed in the shape of a concave shape that opens to the rear. The upper and lower ends of the spring housing portion 52F are cut out, and the inside and outside of the spring housing portion 52F are in communication in the vertical direction. The left and right sides of the main body connecting portion 52 (first main body connecting portion 52A and second main body connecting portion 52B) are configured as sliding surfaces 52G on which the protector plate 56, which will be described later, slides.

[0032] The handle connecting portion 54 is formed in the shape of a hollow plate with its thickness in the vertical direction and is open to the front. The main body connecting portion 52 of the main body housing 22 is inserted into the handle connecting portion 54 so as to be movable relative to it in the front-rear direction. A right-side fixing shaft 54A, which serves as both a locking portion and a fixing shaft, is provided on the right wall of the handle connecting portion 54. The right-side fixing shaft 54A is formed in a substantially cylindrical shape with its axial direction in the left-right direction (first direction) and protrudes to the left from the right wall of the handle connecting portion 54. A counterbore portion 54B, which is open to the right, is formed on the right side of the handle connecting portion 54 at a position corresponding to the right-side fixing shaft 54A, and the inside of the right-side fixing shaft 54A penetrates in the left-right direction and communicates with the counterbore portion 54B. A left-side fixing shaft 54C, which serves as both a locking portion and a fixing shaft, is provided on the left wall of the handle connecting portion 54. The right-side fixing shaft 54A is formed in a substantially cylindrical shape with its axial direction in the left-right direction and protrudes to the right from the left wall of the handle connecting portion 54. The right-side fixing shaft 54A and the left-side fixing shaft 54C are arranged coaxially, and a fixing screw SC (broadly understood as an element that can be considered a fixing member) is inserted into the right-side fixing shaft 54A and screwed into the inner circumferential surface of the left-side fixing shaft 54C, thereby fixing the handle members 24L and 24R of the handle housing 24 to each other. The right-side fixing shaft 54A and the left-side fixing shaft 54C are inserted into the mating hole 52C of the main body housing 22 so as to be able to move relative to each other, and are positioned at the rear end of the mating hole 52C. When the handle housing 24 moves from its initial position to the pressed position, the right-side fixing shaft 54A and the left-side fixing shaft 54C move forward within the mating hole 52C.

[0033] The left and right inner circumferential surfaces of the handle connecting portion 54 are formed along a plane perpendicular to the left-right direction. Furthermore, at the rear end of the left and right inner circumferential surfaces of the handle connecting portion 54, there are protruding portions 54D that extend inward in the left-right direction, and the second main body connecting portion 52B of the main body connecting portion 52 is positioned between the pair of left and right protruding portions 54D. In addition, the portion between the right fixed shaft 54A and the left fixed shaft 54C of the handle connecting portion 54 and the protruding portions 54D is configured as a mounting portion 54E for attaching the protector plate 56, which will be described later, and the mounting portion 54E is formed in a concave shape that opens inward in the left-right direction (towards the center in the left-right direction) when viewed from above.

[0034] The protector plate 56 is made of a metal plate and formed into a predetermined shape by press working or the like. The protector plate 56 is formed in a substantially elongated plate shape with the left-right direction as the thickness direction and the front-rear direction as the longitudinal direction. An insertion hole 56A is formed through the front end portion of the protector plate 56, and the insertion hole 56A is formed in a substantially rectangular shape with the front-rear direction as the longitudinal direction. A first restricting portion 56B, which serves as a retaining portion and a restricting portion, is provided at the rear end edge of the insertion hole 56A, which is bent inward in the left-right direction. The first restricting portion 56B is slightly inclined forward as it extends inward in the left-right direction, and is configured to be elastically deformable in the front-rear direction starting from the base end of the first restricting portion 56B. A second restricting portion 56C, which serves as a restricting portion, is formed at the rear end portion of the protector plate 56 at a position corresponding to the protruding portion 54D of the handle connecting portion 54, and is bent inward in a substantially crank shape in the left-right direction. The front-to-back distance between the first restricting section 56B and the second restricting section 56C is set to be slightly longer than the front-to-back distance between the mounting section 54E of the handle connecting section 54.

[0035] Then, the right-side fixed shaft 54A is inserted from the right side into the insertion hole 56A of the right-side protector plate 56, and the right-side protector plate 56 is attached to the right inner circumference of the handle connecting portion 54. Specifically, the first restricting portion 56B and the second restricting portion 56C of the protector plate 56 are fitted into the right-side mounting portion 54E of the handle connecting portion 54, and the protector plate 56 is attached to the handle connecting portion 54. In addition, when the protector plate 56 is attached to the handle connecting portion 54, the first restricting portion 56B is pressed by the right-side fixed shaft 54A and elastically deforms toward the rear. That is, the first restricting portion 56B presses against the right-side fixed shaft 54A and is locked to the right-side fixed shaft 54A.

[0036] Furthermore, the left protector plate 56 is attached to the left inner circumference of the handle connecting portion 54, similar to the right protector plate 56. In other words, the first restricting portion 56B and the second restricting portion 56C of the left protector plate 56 are fitted into the left mounting portion 54E of the handle connecting portion 54, thereby attaching the protector plate 56 to the handle connecting portion 54.

[0037] As described above, the left and right protector plates 56 are arranged along the left and right inner circumferences of the handle connecting portion 54, and are positioned adjacent to the sliding surface 52G of the main body connecting portion 52 with a predetermined gap in the left-right direction outward. As a result, when the handle housing 24 moves between the initial position and the pressed position, the left-right inner surfaces of the protector plates 56 slide against the sliding surface 52G of the main body connecting portion 52. In other words, the sliding surface 52G of the main body connecting portion 52 slides relative to the left-right inner surfaces of the protector plates 56. That is, when the handle housing 24 moves in the front-rear direction, the handle connecting portion 54, including the protector plates 56, is guided by the main body connecting portion 52.

[0038] In the initial position of the handle housing 24, the first restricting portion 56B is positioned adjacent to the front side of the stopper portion 52D in the main body connecting portion 52, restricting the rearward movement of the handle housing 24. On the other hand, in the pushed-in position of the handle housing 24, the second restricting portion 56C of the protector plate 56 abuts against the stopper portion 52D from the rear, restricting the forward movement of the handle housing 24. In other words, the first restricting portion 56B and the second restricting portion 56C are also configured as members that determine the range of movement of the handle housing 24 in the front-rear direction. To put it another way, the stopper portion 52D moves relative to the first restricting portion 56B and the second restricting portion 56C, and abuts against the first restricting portion 56B or the second restricting portion 56C in the initial position and the pushed-in position.

[0039] The biasing spring 58 is configured as a compression coil spring extending in the front-rear direction and is housed in the spring housing portion 52F of the main body connecting portion 52 in the main body housing 22. The front end of the biasing spring 58 is locked to the rear surface of the first main body connecting portion 52A, and the rear end of the biasing spring 58 is locked to the rear surface of the handle connecting portion 54, so that the biasing spring 58 biases the handle housing 24 toward the rear. As a result, the biasing force of the biasing spring 58 holds the handle housing 24 in its initial position.

[0040] (Regarding the lower connecting mechanism 60) As shown in Figures 2, 5, and 6, the lower connecting mechanism 60 is configured as a mechanism that connects the lower end of the handle housing 24 to the main body housing 22. The lower connecting mechanism 60 connects the lower end of the handle housing 24 to the main body housing 22 so that it can rotate relative to it with the left-right direction as the axial direction. The lower connecting mechanisms 60 are provided on both the left and right sides of the rear end of the hammer drill 10, and the left and right lower connecting mechanisms 60 are configured symmetrically with respect to the left-right center of the hammer drill 10. For this reason, in the following description, the configuration of the right lower connecting mechanism 60 will be described, and the configuration of the left lower connecting mechanism 60 will be omitted as appropriate.

[0041] The lower connecting mechanism 60 is composed of a support cylinder portion 62 as a connected portion provided on the main body housing 22, a hinge portion 64 as a connecting portion provided on the handle housing 24, a sleeve 66 as a protector, and a damper 68 as an elastic body.

[0042] A base portion 22A for providing a support cylinder portion 62 is provided at the lower rear end of the main housing 22, and the base portion 22A is raised toward the rear. The support cylinder portion 62 is formed in a substantially stepped bottomed cylindrical shape that is open to the right side, and is integrally formed with the side wall of the base portion 22A, and protrudes toward the rear from the base portion 22A. Specifically, the support cylinder portion 62 is composed of a small diameter portion 62A that constitutes the bottom side of the support cylinder portion 62 and a large diameter portion 62B that constitutes the opening side of the support cylinder portion 62.

[0043] The support cylinder portion 62 is positioned slightly above the lower corner of the base portion 22A. The base portion 22A and the pair of left and right support cylinder portions 62 are inserted from the front into the lower end of the handle housing 24 and are positioned between the left and right side walls of the handle housing 24. A slit 22B, which extends in the left-right direction as an insertion portion, is formed through the rear wall of the base portion 22A in the front-rear direction. A partition wall 22C is provided inside the base portion 22A, and the partition wall 22C extends forward from the upper edge of the slit 22B. Wiring 34 is inserted through the slit 22B to connect the controller 32 and the switch mechanism 31, and wiring 36 is inserted through the slit 22B to connect the controller 32 and the terminal unit 35. The opening edge of the support cylinder portion 62 is configured as a sliding surface 62C.

[0044] The hinge portion 64 is provided on the inner circumferential surface of the side wall of the handle housing 24 and is positioned close to the right side (outward in the left-right direction) of the support cylinder portion 62. The hinge portion 64 is formed in a substantially circular block shape with the left-right direction as the thickness direction and protrudes to the left from the side wall of the handle housing 24. The left surface of the hinge portion 64 is formed along a plane perpendicular to the left-right direction. The diameter of the hinge portion 64 is set to be larger than the diameter of the support cylinder portion 62, and the hinge portion 64 and the support cylinder portion 62 are arranged coaxially.

[0045] A hinge shaft 64A, which serves as both a locking portion and a rotation axis, is integrally formed in the central part of the hinge portion 64. The hinge shaft 64A is formed in a substantially cylindrical shape with its axial direction in the left-right direction and protrudes to the left from the hinge portion 64. The hinge shaft 64A is positioned inside the support cylinder portion 62 and is rotatably supported by the support cylinder portion 62. Specifically, the tip of the hinge shaft 64A is positioned radially inward of the small diameter portion 62A and is rotatably supported therein.

[0046] The sleeve 66 is made of metal and is formed in a cylindrical shape with its axial direction running horizontally. Specifically, the sleeve 66 consists of a sleeve body 66A, which is a substantially cylindrical main body with its axial direction running horizontally, and a substantially annular flange 66B that extends radially outward from the right end of the sleeve body 66A. The diameter of the flange 66B is approximately the same as the diameter of the hinge portion 64. The hinge shaft 64A is fitted into the sleeve body 66A from the right side, and the sleeve 66 is attached to the handle housing 24. In other words, the sleeve body 66A is locked to the hinge shaft 64A. The front end of the sleeve body 66A is positioned radially inward of the small diameter portion 62A with a predetermined gap and is rotatably supported by the small diameter portion 62A.

[0047] The flange 66B is positioned adjacent to the left side of the hinge portion 64, covering almost the entire hinge portion 64 from the left side. As a result, the sleeve 66 is positioned between the hinge portion 64 and the support cylinder portion 62, and when the hinge portion 64 rotates relative to the support cylinder portion 62, the sleeve 66 slides against the support cylinder portion 62. Specifically, the flange 66B slides on the sliding surface 62C of the support cylinder portion 62, and the sleeve body 66A slides against the small diameter portion 62A of the support cylinder portion 62. In other words, when the handle housing 24 rotates relative to the main housing 22, the support cylinder portion 62 slides relative to the sleeve 66.

[0048] The damper 68 is made of an elastic material such as rubber and is formed in a substantially cylindrical shape with its axial direction in the left-right direction. The damper 68 is housed within the large-diameter portion 62B of the support cylinder portion 62 and is compressed radially by the sleeve 66 and the large-diameter portion 62B. As a result, the sleeve 66 (hinge shaft 64A) is biased radially inward by the damper 68 and held in the center of the support cylinder portion 62. Furthermore, since the hinge shaft 64A is supported by the elastically deformed damper 68, vibrations generated in the work machine of the hammer drill 10 are absorbed by the damper 68.

[0049] (Effects and Benefits) In the initial state of the hammer drill 10 configured as described above, the handle housing 24 is positioned in its initial position. When the hammer drill 10 is used for drilling, the operator grips the gripping portion 24A of the handle housing 24 and positions the tip tool T on the rear side of the workpiece. Then, the operator pushes the handle housing 24 forward, pressing the tip tool T against the workpiece. At this time, the upper connecting mechanism 50 and the lower connecting mechanism 60 are activated, and the handle housing 24 moves from the initial position to the forward pressing position. Specifically, in the upper connecting mechanism 50, the handle connecting portion 54 of the handle housing 24 moves forward relative to the main body connecting portion 52 of the main body housing 22 against the biasing force of the biasing spring 58. Furthermore, in the pushed-in position of the handle housing 24, the second restricting portion 56C of the protector plate 56 contacts the stopper portion 52D from the rear, restricting the forward movement of the handle housing 24 (see Figure 8). Meanwhile, in the lower connecting mechanism 60, the hinge shaft 64A, including the sleeve 66 of the handle housing 24, rotates relative to the support cylinder portion 62 of the main housing 22 around its own axis. Furthermore, at this time, the damper 68 is pressed forward by the sleeve 66, and the hinge shaft 64A, including the sleeve 66, is displaced forward relative to the support cylinder portion 62, causing the sleeve body 66A to come into contact with the small diameter portion 62A of the support cylinder portion 62 (see Figure 9).

[0050] Then, by pulling the trigger 30 of the hammer drill 10, the motor 37 is driven and the tip tool T rotates around its axis. This causes a hole to be drilled in the workpiece. After the drilling of the workpiece is completed, the forward pressure on the handle housing 24 is released, and the biasing force of the biasing spring 58 returns the handle housing 24 to its initial position.

[0051] Here, the upper connecting mechanism 50 that connects the upper end of the handle housing 24 to the main body housing 22 includes a handle connecting portion 54 provided on the handle housing 24 and a main body connecting portion 52 provided on the main body housing 22, with the handle connecting portion 54 being connected to the main body connecting portion 52 so as to be movable relative to it in the front-rear direction. A metal protector plate 56 is provided on the handle connecting portion 54, and the protector plate 56 is adjacent to the left-right outer side of the main body connecting portion 52. As a result, when the handle housing 24 moves relative to the main body housing 22 in the front-rear direction, the protector plate 56 is guided by the main body connecting portion 52. That is, the protector plate 56 slides on the sliding surface 52G of the main body connecting portion 52. In other words, the sliding surface 52G of the main body connecting portion 52 slides on the left-right inner surface of the protector plate 56. Therefore, the protector plate 56 functions as a member that protects the handle connecting portion 54. This makes it possible to suppress wear on the handle connecting portion 54 of the handle housing 24 compared to a configuration in which the protector plate 56 is omitted. As a result, it is possible to suppress play of the handle housing 24 relative to the main body housing 22 in the left-right direction. In this way, the reliability of the hammer drill 10 can be improved.

[0052] Furthermore, in the upper connecting mechanism 50, the first restricting portion 56B of the protector plate 56 is locked to the right fixed shaft 54A (left fixed shaft 54C), and the protector plate 56 is attached to the handle housing 24. In addition, the right fixed shaft 54A and the left fixed shaft 54C are inserted into the mating holes 52C of the main body connecting portion 52 of the main body housing 22 and are supported in the mating holes 52C so as to be able to move relative to each other in the front-rear direction. This allows the protector plate 56 to be attached to the handle housing 24 by utilizing the right fixed shaft 54A and the left fixed shaft 54C which are mated with the main body connecting portion 52.

[0053] Furthermore, in the upper connecting mechanism 50, the first restricting portion 56B of the protector plate 56 is locked to the right-side fixed shaft 54A (left-side fixed shaft 54C) in an elastically deformed state. Specifically, the first restricting portion 56B and the second restricting portion 56C of the protector plate 56 are fitted into the mounting portion 54E of the handle connecting portion 54, and the first restricting portion 56B is pressed rearward by the right-side fixed shaft 54A (left-side fixed shaft 54C) and presses against the right-side fixed shaft 54A (left-side fixed shaft 54C). As a result, the protector plate 56 can be attached to the handle connecting portion 54 by inserting the protector plate 56 into the mounting portion 54E from the inside in the left-right direction. Therefore, the ease of assembly of the protector plate 56 can be improved.

[0054] Furthermore, the right-side fixing shaft 54A and the left-side fixing shaft 54C are configured as shafts for fixing the handle members 24L and 24R together in the handle housing 24. Therefore, the protector plate 56 can be attached to the handle housing 24 by utilizing the right-side fixing shaft 54A and the left-side fixing shaft 54C, which are used to fix the handle members 24L and 24R together.

[0055] Furthermore, the protector plates 56 are provided on the left and right outer sides of the main body connecting portion 52. This effectively suppresses rattling between the handle housing 24 and the main body housing 22 in the left and right directions.

[0056] Furthermore, the protector plate 56 has a first restricting portion 56B and a second restricting portion 56C that are spaced apart in the front-rear direction, and the stopper portion 52D of the main body connecting portion 52 is positioned between the first restricting portion 56B and the second restricting portion 56C. When the stopper portion 52D abuts against the first restricting portion 56B or the second restricting portion 56C, the movement of the handle housing 24 toward the rear or front is restricted. In other words, the front-rear movement range of the handle housing 24 is determined by the first restricting portion 56B and the second restricting portion 56C. As a result, the movement range of the handle housing 24 can be determined by the first restricting portion 56B and the second restricting portion 56C, which are made of a relatively low-wear metal. Consequently, changes in the initial position and the pressed position of the handle housing 24 can be suppressed. Therefore, the reliability of the hammer drill 10 can be effectively improved.

[0057] Furthermore, the lower connecting mechanism 60 that connects the lower end of the handle housing 24 to the main housing 22 includes a hinge portion 64 provided on the handle housing 24 and a support cylinder portion 62 provided on the main housing 22, with the support cylinder portion 62 rotatably supporting the hinge shaft 64A of the hinge portion 64. The hinge portion 64 is also provided with a metal sleeve 66, and the flange 66B of the sleeve 66 is positioned adjacent to the left-right outer side of the support cylinder portion 62. As a result, when the handle housing 24 rotates relative to the main housing 22, the flange 66B of the sleeve 66 slides on the sliding surface 62C of the support cylinder portion 62. In other words, the sliding surface 62C of the support cylinder portion 62 slides on the left-right inner surface of the flange 66B of the sleeve 66. Therefore, the sleeve 66 functions as a member that protects the handle housing 24. This makes it possible to suppress wear on the hinge portion 64 of the handle housing 24 compared to a configuration in which the sleeve 66 is omitted. As a result, it is possible to suppress play of the handle housing 24 relative to the main housing 22 in the left-right direction. Therefore, the reliability of the hammer drill 10 can be improved.

[0058] Furthermore, a damper 68 is housed in the large-diameter portion 62B of the support cylinder portion 62, and the damper 68 biases the sleeve body 66A radially inward. As a result, the damper 68 can hold the sleeve 66 towards the center of the support cylinder portion 62. Also, since the sleeve 66 is made of metal, the coefficient of friction of the sleeve 66 can be lowered compared to when the sleeve 66 is made of resin. Therefore, wear of the damper 68 can be suppressed. Consequently, the reliability of the hammer drill 10 can be further improved.

[0059] Furthermore, a slit 22B extending in the left-right direction and penetrating in the front-rear direction is formed in the rear wall of the base portion 22A of the main body housing 22, between a pair of left and right support cylinder portions 62. Wiring 34 is inserted through the slit 22B to connect the controller 32 and the switch mechanism 31, and wiring 36 is inserted through the slit 22B to connect the controller 32 and the terminal unit 35. In other words, the wiring 34 and wiring 36 that span the main body housing 22 and the handle housing 24 can be positioned near the hinge axis 64A, which is the rotation center of the handle housing 24. In other words, when the handle housing 24 moves relative to the main body housing 22, the wiring 34 and wiring 36 can be routed in a part where the amount of displacement relative to the main body housing 22 is small. As a result, repeated bending of the wiring 34 and wiring 36 when the handle housing 24 moves relative to the main body housing 22 can be suppressed. Therefore, the reliability of the hammer drill 10 can be effectively improved.

[0060] In this embodiment, the protector plate 56 and sleeve 66 are provided on the handle housing 24, but they may also be configured to be provided on the main body housing 22. For example, in the upper connecting mechanism 50, the protector plate 56 may be attached to the left and right sides of the main body connecting portion 52, so that the left and right inner circumferences of the handle connecting portion 54 slide against the protector plate 56. Also, for example, in the lower connecting mechanism 60, the hinge portion 64 may be provided on the main body housing 22, the support cylinder portion 62 may be provided on the handle housing 24, and the sleeve 66 may be provided on the main body housing 22. [Explanation of symbols]

[0061] 10. Hammer drill (working tool) 22 Main Housing 22B Slit (insertion part) 24 Handle housing (handle) 24A Grip 24L Handle component 24R Handle component 32 controllers 33. Battery pack (power supply unit) 37. Motor (drive unit) 52 Main body connecting part (connected part) 52C Engagement hole (engagement part) 54 Handle connection part (connection part) 54A Right side fixed shaft (locking part and fixed shaft) 54C Left-side fixed shaft (locking part and fixed shaft) 56 (Protector) 56B First regulating section (holding section and regulating section) 56C Second Regulatory Department (Regulatory Department) 64. Hinge section (connecting section) 64A Hinge shaft (locking part and rotation shaft) 66 sleeves (protectors) 66A Sleeve body (main body) 68. Damper (elastic body) T Tip tool

Claims

1. The drive unit and A resin main housing that houses the aforementioned drive unit, A tip tool extending from the main housing and operated by the driving force of the drive unit, A resin handle having a gripping portion for the worker to hold, A connecting portion provided on the handle and connected to the main body housing so as to be movable relative to it, The main housing is provided with a connected portion to which the connecting portion is connected, A metal protector is provided on one of the connecting portion and the connected portion, such that the other of the connecting portion and the connected portion slides when the handle moves relative to the main body housing, Equipped with, A fixed shaft extending in the first direction is provided on either the connecting portion or the connected portion. A work machine having a mating portion on the other of the connecting portion and the connected portion, which is mated to the fixed shaft and supports the fixed shaft so as to be movable relative to it in a second direction perpendicular to the first direction.

2. The fixed shaft is the work machine according to claim 1, which locks the protector.

3. The protector has a retaining portion configured to be elastically deformable, The work machine according to claim 2, wherein the holding portion is pressed against the fixed shaft in an elastically deformed state and locked to the fixed shaft.

4. The protector is provided on the connecting portion, and the handle is composed of a handle member divided in the first direction, The fixed shaft is the work machine according to claim 1, which fixes the handle members to each other.

5. The work machine according to claim 4, wherein the protector is provided on both sides in the first direction with respect to the connected portion.

6. The work machine according to claim 1, wherein the protector has a pair of restricting parts, and a part of the connected part abuts against the restricting parts, thereby limiting the range of movement of the connected part in the second direction.

7. A drive unit and A resin main housing that houses the aforementioned drive unit, A tip tool extending from the main housing and operated by the driving force of the drive unit, A resin handle having a gripping portion for the worker to hold, A connecting portion provided on the handle and connected to the main body housing so as to be movable relative to it, The main housing is provided with a connected portion to which the connecting portion is connected, A metal protector is provided on one of the connecting portion and the connected portion, such that the other of the connecting portion and the connected portion slides when the handle moves relative to the main body housing, Equipped with, A rotating shaft extending in the first direction is provided in either the connecting portion or the connected portion. The other of the connecting portion and the connected portion is formed in a cylindrical shape with the first direction as its axial direction, and is a support cylinder portion that rotatably supports the rotation axis. The main housing contains a controller that controls the drive unit. The handle is provided with a power supply unit that supplies power to the drive unit. The pair of rotating shafts and the support cylinder portion are provided spaced apart in the first direction, The main body housing of the work machine is provided with an insertion portion between a pair of rotating shafts and a support cylinder portion, through which wiring connecting the power supply unit and the controller is inserted.

8. The protector is A cylindrical main body attached to the aforementioned rotating shaft, A flange extending radially outward from one end of the main body and positioned opposite the support cylinder in the first direction, The work machine according to claim 7, which is configured including the following.

9. Inside the support cylinder, a cylindrical elastic body is provided on the radially outer side of the rotation axis. The work machine according to claim 8, wherein the elastic body biases the rotating shaft radially inward.

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