JP2024005155A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a working machine.

In the power tool (work machine) described in Patent Document 1 below, the housing that constitutes the outer shell of the power tool has 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 and rear direction. has been done. Further, an elastic body such as rubber is provided between the handle housing and the main body housing. This allows the elastic body to absorb vibrations and the like that occur during the drilling process. Therefore, the workability of the power tool can be improved.

International publication 2020/031888

In a working machine such as a power tool, the main body housing and the handle housing are usually made of a resin material. Therefore, due to the relative movement of the handle housing with respect to the main body housing, there is a possibility that the connecting portion between the main body housing and the handle housing will wear out. In this case, wear of the connecting portion may cause play 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. In other words, the reliability of the power tool may be reduced.

The present invention takes the above facts into consideration and aims to provide a working machine that can improve reliability.

One or more embodiments of the present invention include a drive section, a main body housing made of resin that accommodates the drive section, and a tip tool that extends from the main body housing and is operated by the driving force of the drive section. a handle made of resin having a grip part that is gripped by an operator; a connecting part provided on the handle and connected to the main body housing so as to be relatively movable; and a connecting part provided on the main body housing and connected to the connecting part. a connected portion; and a metal protector provided on one of the connected portion and the connected portion, on which the other of the connected portion and the connected portion slides when the handle moves relative to the main body housing. It is a working machine equipped with

In one or more embodiments of the present invention, one of the connecting portion and the connected portion is provided with a locking portion that locks the protector, and the other of the connecting portion and the connected portion is provided with a locking portion that locks the protector. The working machine is provided with a mating part that is movably mated with the locking part.

In one or more embodiments of the present invention, the protector has a holding part configured to be elastically deformable, and the holding part presses against the locking part in an elastically deformed state to This is a working machine that is locked to a locking part.

In one or more embodiments of the present invention, the locking portion is formed in a shaft shape extending in the first direction, and the engaging portion is configured to move the locking portion in the first direction. The working machine is supported so as to be relatively movable in a second orthogonal direction.

In one or more embodiments of the present invention, the protector is provided at the connecting portion, the handle is constituted by a handle member divided in the first direction, and the locking portion is provided at the connecting portion. This work machine is configured as a fixed shaft that fixes handle members to each other.

One or more embodiments of the present invention is a working machine in which the protector is provided on both sides of the connected portion in the first direction.

In one or more embodiments of the present invention, the protector has a pair of restriction parts, and a part of the connected part abuts the restriction parts, and the connection part in the second direction This is a work machine whose movement range is limited.

In one or more embodiments of the present invention, the locking portion is a rotating shaft extending in a first direction, and the engaging portion is formed in a cylindrical shape with the axial direction in the first direction. and rotatably supports the rotating shaft, the protector includes a cylindrical main body attached to the rotating shaft, and extends radially outward from one end of the main body, The working machine includes the fitting portion and a flange arranged to face each other in the first direction.

In one or more embodiments of the present invention, a cylindrical elastic body is provided inside the fitting portion on a radially outer side of the rotation shaft, and the elastic body supports the rotation shaft. This is a work machine that is biased inward in the radial direction.

In one or more embodiments of the present invention, the main body housing accommodates a controller that controls the drive unit, the handle is provided with a power supply unit that supplies power to the drive unit, and a pair of The locking portion and the mating portion are provided spaced apart in the first direction, and the power supply portion and the mating portion are provided in the main body housing between the pair of locking portions and the mating portion. This work machine is provided with an insertion portion through which a wire connecting to a controller is inserted.

According to one or more embodiments of the invention, reliability may be improved.

FIG. 2 is a side view of the hammer drill according to the present embodiment, seen from the right side. FIG. 2 is a cross-sectional view of the inside of the hammer drill shown in FIG. 1, viewed from the right side. FIG. 3 is a cross-sectional view (cross-sectional view taken along the line 3-3 in FIG. 2) of the upper coupling mechanism of the hammer drill shown in FIG. 2 when viewed from above. 4 is an exploded perspective view showing a state in which the right handle member is removed from the main body housing of the upper coupling mechanism shown in FIG. 3. FIG. FIG. 3 is a cross-sectional view (cross-sectional view taken along the line 5-5 in FIG. 2) of the lower coupling mechanism of the hammer drill shown in FIG. 2 when viewed from above. FIG. 3 is a cross-sectional view (cross-sectional view taken along the line 6-6 in FIG. 2) of the lower coupling mechanism of the hammer drill shown in FIG. 2, viewed from the rear side. FIG. 2 is a side view showing a state in which the handle housing of the hammer drill shown in FIG. 1 has been moved to a push-in position. FIG. 4 is a sectional view corresponding to FIG. 3 showing the state of the upper coupling mechanism in the pushed-in position of the handle housing. FIG. 6 is a sectional view corresponding to FIG. 5 showing the state of the lower coupling mechanism in the pushed-in position of the handle housing.

Hereinafter, a hammer drill 10 as a working machine according to the present embodiment will be explained using the drawings. Note that arrows UP, FR, and RH shown appropriately in the drawings indicate the upper side, front side, and right side of the hammer drill 10. In the following description, when the directions are described using up-down, front-back, and left-right directions, the up-down direction, front-back direction, and left-right direction of the hammer drill 10 are meant unless otherwise specified.

As shown in FIGS. 1 and 2, the hammer drill 10 is configured as a power tool that performs drilling operations on a workpiece. The hammer drill 10 includes a housing 20, a motor 37 as a drive section, and a transmission mechanism 40 that transmits the driving force of the motor 37 to the tip tool T. Each configuration of the hammer drill 10 will be described below.

(About the housing 20)
The housing 20 constitutes the outer shell of the hammer drill 10. The housing 20 includes a main body housing 22 constituting a front portion of the housing 20 and a handle housing 24 serving as a handle constituting a rear portion of the housing 20.

The main body housing 22 is constituted by a plurality of housing members and is formed into a substantially inverted L shape when viewed from the right side. The handle housing 24 extends in the vertical direction, and the upper and lower ends of the handle housing 24 are bent forward and connected to the rear end of the main body housing 22 . Specifically, the upper end of the handle housing 24 is connected to the upper end of the main body housing 22 by an upper connecting mechanism 50 so as to be relatively movable in the front-rear direction. Further, the lower end portion of the handle housing 24 is rotatably connected by a lower connecting mechanism 60 with the left-right direction as an axial direction. The handle housing 24 is placed at the initial position (the position shown in FIG. 1), and when the operator pushes the handle housing 24 forward during drilling, the handle housing 24 is displaced forward from the initial position. The push-in position (the position shown in FIG. 7) is the position shown in FIG. Note that the upper connecting mechanism 50 and the lower connecting mechanism 60 will be described later.

The handle housing 24 is composed of handle members 24L and 24R that are divided into two parts in the left and right direction, and the handle housing 24 is formed by assembling the handle members 24L and 24R together. A vertically extending portion of the handle housing 24 is configured as a grip portion 24A that is gripped by an operator. A trigger 30 is provided at the upper end of the grip portion 24A. The trigger 30 projects forward from the handle housing 24 and is configured to be pulled rearward. As shown in FIG. 2, a switch mechanism 31 is provided on the rear side of the trigger 30 in the grip portion 24A. The switch mechanism 31 includes a switch (not shown) operated by the trigger 30. The switch is electrically connected to the controller 32 by a wire 34 arranged 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 in the lower end of the main body housing 22. A battery pack 33 serving as a power source is attached to 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 a wiring 36, and power is supplied from the battery pack 33 to a motor 37 and the controller 32, which will be described later.

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

(About the transmission mechanism 40)
The transmission mechanism 40 is configured as a mechanism section that transmits the rotational force of the motor 37 to the tip tool T to drive the tip tool T. The transmission mechanism 40 includes an inner housing 41, an intermediate shaft 42, and a transmission section 47, and is housed in the upper part of the main body housing 22.

The inner housing 41 is formed into a substantially elliptical cylinder shape with a bottom and opened to the front side. The inner housing 41 is arranged above the motor 37 so as to partition the rear end of the upper part of the main body housing 22 in the front-rear direction. A motor bearing 39 is held at the lower end of the inner housing 41, and an output shaft 37A of the motor 37 supported by the motor bearing 39 is disposed within the inner housing 41.

The intermediate shaft 42 is formed in a substantially cylindrical shape with the longitudinal direction as the axial direction, and the front end and rear end of the intermediate shaft 42 are rotatably supported by bearings 43 and 44 fixed to the main body housing 22. has been done. A bevel gear 45 is provided at the rear end of the intermediate shaft 42 so as to be integrally rotatable, and the bevel gear 45 meshes with the pinion gear 37B of the output shaft 37A. Thereby, the intermediate shaft 42 is configured to rotate around its own axis when the motor 37 is driven and the output shaft 37A rotates. A motion converting member 46 is provided on the intermediate shaft 42, and the motion converting member 46 converts the rotational motion of the intermediate shaft 42 into a reciprocating motion in the front-rear direction and applies impact force to a transmission section 47, which will be described later. It is configured.

The transmission portion 47 extends in the front-rear direction above the intermediate shaft 42 . A tip tool T is attached to the front end of the transmission section 47. The tip tool T is formed into a substantially cylindrical shape with an axial direction in the front-rear direction, and a rear end portion of the tip tool T is attached to the transmission section 47. Furthermore, the transmission section 47 is connected to the intermediate shaft 42. As a result, the rotational force of the motor 37 is transmitted to the tip tool T, and the tip tool T rotates around its own axis to perform drilling on the workpiece. Further, the impact force by the motion conversion member 46 is applied to the tip tool T via the transmission section 47.

(About the upper coupling mechanism 50)
As shown in FIGS. 2 to 4, the upper connecting mechanism 50 is configured as a mechanism that connects the upper end of the handle housing 24 and the upper end of the rear end of the main body housing 22. Accordingly, the upper end portion of the handle housing 24 is connected to the main body housing 22 so as to be relatively movable in the front-rear direction (second direction). The upper connecting mechanism 50 includes a main body connecting part 52 as a connected part provided on the main body housing 22, a handle connecting part 54 as a connecting part provided on the handle housing 24, and protector plates 56 as a pair of left and right protectors. and a biasing spring 58.

The main body connecting portion 52 is formed into a substantially rectangular plate shape whose thickness direction is the vertical direction, and protrudes rearward from the upper end of the main body housing 22 . The main body connecting part 52 is configured to include a first main body connecting part 52A that constitutes the front part of the main body connecting part 52, and a second main body connecting part 52B that constitutes the rear end of the main body connecting part 52. . The width dimension (horizontal dimension) of the second main body connecting part 52B is set smaller than the width dimension of the first main body connecting part 52A, and the left and right side surfaces of the second main body connecting part 52B are connected to the first main body connecting part 52B. It is arranged at a position one step lower in the left and right direction with respect to the left and right side surfaces of the portion 52A.

A mating hole 52C serving as a mating portion is formed to penetrate in the left-right direction at the rear end portion of the first main body connecting portion 52A. The mating hole 52C is formed in the shape of a substantially rectangular long hole whose longitudinal direction is the front-rear direction when viewed from the left-right direction. Both ends in the left and right direction of the rear wall of the first main body connecting portion 52A are configured as a stopper portion 52D, and the front surface of the stopper portion 52D is located at a position one step lower to the rear side with respect to the rear surface of the mating hole 52C. has been done.

On the left and right side surfaces of the second main body connecting portion 52B, a meat relief portion 52E is formed at an intermediate portion in the vertical direction, and the meat relief portion 52E extends in the front-rear direction and is opened outward in the left-right direction. It is formed in a groove shape. A spring accommodating portion 52F for accommodating a biasing spring 58, which will be described later, is formed at the center in the left-right direction of the second main body connecting portion 52B, and the spring accommodating portion 52F is formed in a concave shape that is open to the rear side. has been done. Note that the upper and lower ends of the spring accommodating portion 52F are cut out, and the inside and outside of the spring accommodating portion 52F communicate in the vertical direction. The left and right side surfaces of the main body connecting part 52 (the first main body connecting part 52A and the second main body connecting part 52B) are configured as sliding surfaces 52G on which a protector plate 56, which will be described later, is slid.

The handle connecting portion 54 is formed in the shape of a hollow plate whose thickness direction is the vertical direction, and is open to the front side. The main body connecting portion 52 of the main body housing 22 is inserted into the handle connecting portion 54 so as to be relatively movable in the front-back direction. A right side fixed shaft 54A is provided on the right wall of the handle connecting portion 54 as a locking portion and a fixed shaft, and the right side fixed shaft 54A has a substantially cylindrical shape with the axial direction in the left-right direction (first direction). The handle connecting portion 54 is formed so as to protrude from the right wall of the handle connecting portion 54 to the left side. A counterbore portion 54B is formed on the right side of the handle connecting portion 54 at a position corresponding to the right side fixed shaft 54A, and is opened to the right side, and the inside of the right side fixed shaft 54A penetrates in the left-right direction. It communicates with the counterbore portion 54B. A left side fixed shaft 54C as a locking part and a fixed shaft is provided on the left wall of the handle connecting part 54, and the right side fixed shaft 54A is formed in a substantially cylindrical shape with the axial direction in the left-right direction. It protrudes from the left wall of the connecting portion 54 to the right side. The right side fixed shaft 54A and the left side fixed shaft 54C are arranged coaxially, and the fixing screw SC (in a broad sense, an element that can be understood as a fixing member) is inserted into the right side fixed shaft 54A, and the left side fixed shaft 54C is arranged coaxially. The handle members 24L and 24R of the handle housing 24 are fixed to each other by being screwed onto the inner peripheral surface of the shaft 54C. The right side fixed shaft 54A and the left side fixed shaft 54C are inserted into the fitting hole 52C of the main body housing 22 so as to be relatively movable, and are arranged at the rear end of the fitting hole 52C. When the handle housing 24 moves from the initial position to the pressed position, the right side fixed shaft 54A and the left side fixed shaft 54C move forward in the fitting hole 52C.

The left and right inner circumferential surfaces of the handle connecting portion 54 are formed along a plane perpendicular to the left-right direction. Further, on the left and right inner circumferential surfaces of the handle connecting portion 54, projecting portions 54D that project inward in the left and right direction are formed at the rear end portions, and a main body is provided between the pair of left and right projecting portions 54D. A second main body connecting portion 52B of the connecting portion 52 is arranged. Further, a portion between the right side fixed shaft 54A, the left side fixed shaft 54C, and the overhanging portion 54D in the handle connecting portion 54 is configured as a mounting portion 54E for mounting a protector plate 56, which will be described later. 54E is formed in a concave shape that is open to the inside in the left-right direction (toward the center in the left-right direction) in plan view.

The protector plate 56 is made of a metal plate and is formed into a predetermined shape by press working or the like. The protector plate 56 is formed into a substantially elongated plate shape with the thickness direction in the left-right direction and the longitudinal direction in the front-rear direction. An insertion hole 56A is formed through the front end side of the protector plate 56, and the insertion hole 56A is formed in a substantially rectangular shape whose longitudinal direction is the front-rear direction. A first restriction portion 56B, which serves as a holding portion and a restriction portion, is provided at the rear edge of the insertion hole 56A, which is bent inward in the left-right direction. The first restricting portion 56B is slightly inclined toward the front as it goes inward in the left-right direction, and is configured to be elastically deformable in the front-rear direction starting from the base end portion of the first restricting portion 56B. A second restriction portion 56C is formed on the rear end side of the protector plate 56 at a position corresponding to the protruding portion 54D of the handle coupling portion 54, and is bent inward in the left-right direction in a substantially crank shape. There is. The longitudinal distance between the first regulating portion 56B and the second regulating portion 56C is set to be slightly longer than the longitudinal distance of the attachment portion 54E of the handle coupling portion 54.

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 side inner peripheral portion of the handle connecting portion 54. Specifically, the first regulating part 56B and the second regulating part 56C of the protector plate 56 are fitted into the right mounting part 54E of the handle coupling part 54, and the protector plate 56 is attached to the handle coupling part 54. There is. Furthermore, 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 is elastically deformed rearward. That is, the first regulating portion 56B presses against the right side fixed shaft 54A and is locked to the right side fixed shaft 54A.

Further, the left protector plate 56 is also attached to the left inner peripheral portion of the handle coupling portion 54, similarly to the right protector plate 56. That is, the first restricting portion 56B and the second restricting portion 56C of the left protector plate 56 are fitted into the left attaching portion 54E of the handle connecting portion 54, and the protector plate 56 is attached to the handle connecting portion 54. .

The left and right protector plates 56 are arranged along the left and right inner peripheries of the handle connecting portion 54 as described above, and are provided with a predetermined gap outwardly in the left and right direction with respect to the sliding surface 52G of the main body connecting portion 52. They are placed adjacent to each other with space between them. Thereby, when the handle housing 24 moves between the initial position and the pushed-in position, the left-right inner surface of the protector plate 56 slides on the slidable surface 52G of the main body connecting portion 52. . In other words, it can be said that the sliding surface 52G of the main body connecting portion 52 relatively slides on the inner surface of the protector plate 56 in the left-right direction. That is, when the handle housing 24 moves in the front-rear direction, the handle connecting portion 54 including the protector plate 56 is guided by the main body connecting portion 52 .

At the initial position of the handle housing 24, the first restricting portion 56B is disposed adjacent to the front side of the stopper portion 52D in the main body connecting portion 52, and movement of the handle housing 24 to the rear side is restricted. On the other hand, when the handle housing 24 is in the pushed-in position, the second restricting portion 56C of the protector plate 56 contacts the stopper portion 52D from the rear side, thereby restricting the movement of the handle housing 24 toward the front side. That is, 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. In other words, the stopper portion 52D moves relatively between the first restricting portion 56B and the second restricting portion 56C, and comes into contact with the first restricting portion 56B or the second restricting portion 56C at the initial position and the pushed-in position. It has become.

The biasing spring 58 is configured as a compression coil spring extending in the front-rear direction, and is housed in the spring accommodating 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 The handle housing 24 is urged rearward. As a result, the handle housing 24 is held at the initial position by the biasing force of the biasing spring 58.

(About the lower coupling mechanism 60)
As shown in FIGS. 2, 5, and 6, the lower connecting mechanism 60 is configured as a mechanism that connects the lower end of the handle housing 24 and the main body housing 22. A lower end portion of the handle housing 24 is connected to the main body housing 22 so as to be relatively rotatable with the left-right direction as an axial direction. The lower connecting mechanisms 60 are provided on both 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 center of the hammer drill 10 in the left-right direction. . Therefore, in the following description, the configuration of the lower coupling mechanism 60 on the right side will be explained, and the explanation of the configuration of the lower coupling mechanism 60 on the left side will be omitted as appropriate.

The lower connecting mechanism 60 includes 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 an elastic body. The damper 68 is configured to include a damper 68.

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

The support cylinder part 62 is arranged slightly above the lower corner of the base part 22A. The base portion 22A and the pair of left and right support cylinder portions 62 are inserted into the lower end portion of the handle housing 24 from the front side and are disposed between the left and right side walls of the handle housing 24. A slit 22B serving as an insertion portion extending in the left-right direction 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. A wire 34 is inserted through the slit 22B to connect the controller 32 and the switch mechanism 31, and a wire 36 is inserted through the slit 22B to connect the controller 32 and the terminal unit 35. Further, the opening edge of the support cylinder portion 62 is configured as a sliding surface 62C.

The hinge portion 64 is provided on the inner circumferential surface of the side wall of the handle housing 24, and is disposed close to the right side (outside in the left-right direction) of the support cylinder portion 62. The hinge portion 64 is formed in a substantially circular block shape with a thickness direction in the left-right direction, and protrudes from the side wall of the handle housing 24 to the left side. 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 larger than that of the support tube portion 62, and the hinge portion 64 and the support tube portion 62 are coaxially arranged.

A hinge shaft 64A serving as a locking portion and a rotating shaft is integrally formed in the center of the hinge portion 64, and the hinge shaft 64A is formed in a substantially cylindrical shape with the axial direction in the left-right direction. It protrudes from 64 to the left side. The hinge shaft 64A is arranged inside the support cylinder part 62 and is rotatably supported by the support cylinder part 62. Specifically, the tip of the hinge shaft 64A is disposed inside the small diameter portion 62A in the radial direction and is rotatably supported.

The sleeve 66 is made of metal and has a generally cylindrical shape with its axis extending in the left-right direction. Specifically, the sleeve 66 includes a sleeve main body 66A as a substantially cylindrical main body whose axial direction is in the left-right direction, and a substantially annular plate-shaped member extending radially outward from the right end of the sleeve main body 66A. flange 66B. The diameter of the flange 66B substantially matches 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. That is, the sleeve main body 66A is locked to the hinge shaft 64A. The front end portion of the sleeve body 66A is arranged radially inside the small diameter portion 62A with a predetermined gap, and is rotatably supported by the small diameter portion 62A.

The flange 66B is disposed adjacent to the left side of the hinge portion 64 and covers substantially the entire hinge portion 64 from the left side. As a result, the sleeve 66 is disposed between the hinge portion 64 and the support tube portion 62, and when the hinge portion 64 rotates relative to the support tube portion 62, the sleeve 66 slides on the support tube portion 62. It looks like this. Specifically, the flange 66B slides on the slidable surface 62C of the support tube 62, and the sleeve main body 66A slides on the small diameter portion 62A of the support tube 62. In other words, when the handle housing 24 rotates relative to the main body housing 22, the support cylinder portion 62 can be said to slide relative to the sleeve 66.

The damper 68 is made of an elastic material such as rubber, and is formed into a substantially cylindrical shape with its axis extending 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 and deformed in the radial direction by the sleeve 66 and the large diameter portion 62B. As a result, the sleeve 66 (hinge shaft 64A) is urged radially inward by the damper 68 and is held at the center of the support tube 62. Further, since the hinge shaft 64A is supported by the elastically deformed damper 68, the damper 68 absorbs vibrations generated in the working machine of the hammer drill 10.

(effect)
In the initial state of the hammer drill 10 configured as described above, the handle housing 24 is placed at the initial position. When drilling with the hammer drill 10, the operator grasps the grip portion 24A of the handle housing 24 and places the tip tool T on the rear side of the workpiece. Then, the handle housing 24 is pushed forward, and the tip tool T is pressed against the workpiece. At this time, the upper connecting mechanism 50 and the lower connecting mechanism 60 operate, and the handle housing 24 moves from the initial position to the front pressing position. Specifically, in the upper coupling mechanism 50, the handle coupling portion 54 of the handle housing 24 moves forward relative to the main body coupling portion 52 of the main body housing 22 against the biasing force of the biasing spring 58. Further, 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 side, thereby restricting the movement of the handle housing 24 toward the front side (see FIG. 8). On the other hand, in the lower coupling mechanism 60, the hinge shaft 64A that includes the sleeve 66 of the handle housing 24 rotates around its own axis relative to the support cylinder section 62 of the main body housing 22. Furthermore, at this time, the damper 68 is pressed forward by the sleeve 66, the hinge shaft 64A including the sleeve 66 is displaced forward with respect to the support cylinder part 62, and the sleeve main body 66A is moved to the small diameter part of the support cylinder part 62. 62A (see FIG. 9).

Then, by pulling the trigger 30 of the hammer drill 10, the motor 37 is driven, and the tip tool T rotates around its own axis. As a result, drilling is performed on the workpiece. After completing the drilling process on the workpiece, the handle housing 24 is returned to its initial position by the biasing force of the biasing spring 58 by releasing the frontward pressure on the handle housing 24.

Here, the upper connection mechanism 50 that connects the upper end of the handle housing 24 and the main body housing 22 includes a handle connection part 54 provided in the handle housing 24 and a main body connection part 52 provided in the main body housing 22. The handle connecting portion 54 is connected to the main body connecting portion 52 so as to be relatively movable in the front-rear direction. Further, the handle connecting portion 54 is provided with a metal protector plate 56, and the protector plate 56 is adjacent to the outer side of the main body connecting portion 52 in the left-right direction. Thereby, 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 inner surface of the protector plate 56 in the left-right direction. Therefore, the protector plate 56 functions as a member that protects the handle connecting portion 54. Thereby, wear of the handle connecting portion 54 of the handle housing 24 can be suppressed compared to a configuration in which the protector plate 56 is omitted. As a result, shaking of the handle housing 24 with respect to the main body housing 22 in the left-right direction can be suppressed. As described above, the reliability of the hammer drill 10 can be improved.

Further, in the upper coupling mechanism 50, the first restricting portion 56B of the protector plate 56 is engaged with the right side fixed shaft 54A (left side fixed shaft 54C), and the protector plate 56 is attached to the handle housing 24. Further, the right side fixed shaft 54A and the left side fixed shaft 54C are inserted into the fitting hole 52C of the main body connecting portion 52 of the main body housing 22, and are supported in the fitting hole 52C so as to be relatively movable in the front and rear direction. Thereby, the protector plate 56 can be attached to the handle housing 24 by utilizing the right side fixed shaft 54A and the left side fixed shaft 54C that are engaged with the main body connecting portion 52.

Furthermore, in the upper coupling 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) while being elastically deformed to the right side fixed shaft 54A (left side fixed shaft 54C). There is. Specifically, the first regulating part 56B and the second regulating part 56C of the protector plate 56 are fitted into the mounting part 54E of the handle coupling part 54, and the first regulating part 56B is attached to the right fixed shaft 54A (the left fixed shaft 54C). ) and is pressed rearward to the right side fixed shaft 54A (left side fixed shaft 54C). Thereby, the protector plate 56 can be attached to the handle coupling portion 54 by inserting the protector plate 56 into the attachment portion 54E from the inside in the left-right direction. Therefore, the ease of assembling the protector plate 56 can be improved.

Further, the right side fixed shaft 54A and the left side fixed shaft 54C are configured as shaft portions for fixing the handle members 24L and 24R in the handle housing 24. Therefore, the protector plate 56 can be attached to the handle housing 24 by utilizing the right side fixed shaft 54A and the left side fixed shaft 54C for fixing the handle members 24L and 24R.

Further, the protector plates 56 are provided on the outer sides of the main body connecting portion 52 in the left-right direction. Thereby, rattling between the handle housing 24 and the main body housing 22 in the left-right direction can be effectively suppressed.

Further, the protector plate 56 has a first restricting portion 56B and a second restricting portion 56C that are arranged apart from each other in the front-rear direction, and the stopper portion 52D of the main body connecting portion 52 is connected to the first restricting portion 56B and the second restricting portion 56C. It is arranged between the two regulating parts 56C. Then, the stopper portion 52D comes into contact with the first restricting portion 56B or the second restricting portion 56C, thereby restricting the movement of the handle housing 24 to the rear side or the front side. That is, the range of movement of the handle housing 24 in the front-rear direction is determined by the first restricting portion 56B and the second restricting portion 56C. Thereby, the range of movement of the handle housing 24 can be determined by the first restricting part 56B and the second restricting part 56C, which are made of metal with relatively little wear. As a result, it is possible to suppress changes in the initial position and the pushed-in position of the handle housing 24. Therefore, the reliability of the hammer drill 10 can be effectively improved.

Furthermore, the lower connection mechanism 60 that connects the lower end of the handle housing 24 and the main body housing 22 includes a hinge portion 64 provided on the handle housing 24 and a support cylinder portion 62 provided on the main body housing 22. The support cylinder part 62 rotatably supports the hinge shaft 64A of the hinge part 64. Further, the hinge portion 64 is provided with a metal sleeve 66, and a flange 66B of the sleeve 66 is disposed adjacent to the outer side of the support tube portion 62 in the left-right direction. Thereby, when the handle housing 24 rotates relative to the main body housing 22, the flange 66B of the sleeve 66 slides on the slidable surface 62C of the support cylinder portion 62. In other words, the sliding surface 62C of the support cylinder portion 62 slides on the inner surface of the flange 66B of the sleeve 66 in the left-right direction. Therefore, the sleeve 66 functions as a member that protects the handle housing 24. Thereby, wear of the hinge portion 64 of the handle housing 24 can be suppressed compared to a configuration in which the sleeve 66 is omitted. As a result, shaking of the handle housing 24 with respect to the main body housing 22 in the left-right direction can be suppressed. Therefore, the reliability of the hammer drill 10 can be improved.

Further, a damper 68 is housed in the large diameter portion 62B of the support cylinder portion 62, and the damper 68 urges the sleeve body 66A radially inward. Therefore, the damper 68 can hold the sleeve 66 at the center of the support cylinder section 62. Further, since the sleeve 66 is made of metal, the coefficient of friction of the sleeve 66 can be lowered compared to a case where the sleeve 66 is made of resin. Therefore, wear of the damper 68 can be suppressed. Therefore, the reliability of the hammer drill 10 can be further improved.

Further, in the rear wall of the base portion 22A of the main body housing 22, a slit 22B extending in the left-right direction is formed through the rear wall of the base portion 22A in the front-rear direction between the pair of left and right support cylinder portions 62, and the wiring 34 is inserted through the slit. A wire 36 is inserted through the slit 22B to connect the controller 32 and the switch mechanism 31, and a wire 36 is inserted through the slit 22B to connect the controller 32 and the terminal unit 35. That is, the wiring 34 and the wiring 36 that span the main body housing 22 and the handle housing 24 can be arranged near the hinge shaft 64A, which is the center of rotation 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 the wiring 36 can be routed in a portion where the amount of displacement relative to the main body housing 22 is small. As a result, the wiring 34 and the wiring 36 can be prevented from being repeatedly bent when the handle housing 24 moves relative to the main body housing 22. Therefore, the reliability of the hammer drill 10 can be effectively improved.

In this embodiment, the protector plate 56 and the sleeve 66 are provided on the handle housing 24, but the protector plate 56 and the sleeve 66 may be provided on the main body housing 22. For example, the upper connecting mechanism 50 may be configured such that protector plates 56 are attached to the left and right sides of the main body connecting portion 52 so that the left and right inner peripheral portions of the handle connecting portion 54 slide on the protector plates 56. Further, for example, in the lower coupling mechanism 60, the hinge portion 64 may be provided in the main body housing 22, the support cylinder portion 62 may be provided in the handle housing 24, and the sleeve 66 may be provided in the main body housing 22.

10 Hammer drill (work equipment)
22 Main body housing 22B slit (insertion part)
24 Handle housing (handle)
24A Gripping part 24L Handle member 24R Handle member 32 Controller 33 Battery pack (power supply part)
37 Motor (drive part)
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 part (holding part and regulating part)
56C Second Regulation Department (Regulation Department)
64 Hinge part (connection part)
64A Hinge shaft (locking part and rotating shaft)
66 Sleeve (Protector)
66A Sleeve body (main body part)
68 Damper (elastic body)
T Tip tool

Claims (10)

A drive unit;
a main body housing made of resin that accommodates the drive unit;
a tip tool extending from the main body housing and operated by the driving force of the driving section;
a resin handle having a grip part for a worker to grip;
a connecting portion provided on the handle and connected to the main body housing so as to be relatively movable;
a connected part provided in the main body housing and connected to the connecting part;
a metal protector provided on one of the connecting portion and the connected portion, on which the other of the connecting portion and the connected portion slides when the handle moves relative to the main body housing;
A work machine equipped with One of the connecting portion and the connected portion is provided with a locking portion that locks the protector,
The working machine according to claim 1, wherein the other of the connecting portion and the connected portion is provided with an engaging portion that is engaged with the locking portion so as to be relatively movable. The protector has a holding part configured to be elastically deformable,
3. The working machine according to claim 2, wherein the holding part is pressed into contact with the locking part in an elastically deformed state and is locked to the locking part. The locking portion is formed in a shaft shape extending in the first direction,
The working machine according to claim 2 or 3, wherein the engaging portion supports the locking portion so as to be relatively movable in a second direction perpendicular to the first direction. The protector is provided at the connecting portion, and the handle is configured by a handle member divided in the first direction,
The working machine according to claim 4, wherein the locking portion is configured as a fixed shaft that fixes the handle members to each other. The working machine according to claim 5, wherein the protector is provided on both sides of the connected portion in the first direction. 5. The protector has a pair of restriction parts, and a part of the connected part comes into contact with the restriction part, so that a movement range of the connection part in the second direction is restricted. work equipment. The locking portion is a rotating shaft extending in a first direction,
The mating portion is formed in a cylindrical shape with the first direction as the axial direction, and rotatably supports the rotating shaft,
The protector is
a cylindrical main body attached to the rotating shaft;
a flange extending radially outward from one end of the main body and disposed to face the mating portion in the first direction;
The work machine according to claim 2, wherein the work machine includes: A cylindrical elastic body is provided inside the fitting portion on the radially outer side of the rotating shaft,
The working machine according to claim 8, wherein the elastic body urges the rotating shaft radially inward. The main body housing accommodates a controller that controls the drive unit,
The handle is provided with a power supply unit that supplies power to the drive unit,
a pair of the locking portion and the mating portion are provided spaced apart in the first direction;
Claim 8 or Claim 9: The main body housing is provided with an insertion part through which a wire connecting the power supply part and the controller is inserted between the pair of the locking parts and the fitting part. Work equipment described in.

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