Work machine

Abstract

To improve workability.SOLUTION: In a hammer drill 10, a guide rail 21 has a rail engagement part 25 which engages with a rail groove 73 of a battery pack 70, and a latch engagement recess 22 which engages with a latch 75 of the battery pack 70. The guide rail 21 is provided with a protective plate 80, and the protective plate 80 is interposed between the rail groove 73 and the rail engagement part 25 in a vertical direction and a longitudinal direction, and is interposed between the latch 75 and the latch engagement recess 22 in a cross direction. That is, the protective plate 80 is interposed between a fitted part 72 of the battery pack 70 and a battery fitting part 20 in all directions of the cross direction, the longitudinal direction and the vertical direction. By this, wear and so on between the rail engagement part 25 and the latch engagement recess 22 is reduced, and a good installation state of the battery pack 70 can be maintained.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] In the hammer drill (working machine) described in Patent Document 1 below, it includes a housing that houses a motor, a handle, and a battery pack attached to the battery mounting portion of the handle. The handle is rotatably connected to the housing about a rotation axis, and this rotation axis is located within the arrangement region of the battery pack when viewed in the axial direction. Thereby, vibration of the battery pack with respect to the handle can be suppressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above hammer drill, there is room for improvement in the following points. That is, when attaching the battery pack to the battery mounting portion, the battery pack is moved forward, the guide rail of the battery mounting portion is inserted into the guide groove of the battery pack, and the guide rail and the guide groove are engaged. For this reason, for example, the guide rail engaged with the guide groove may wear due to sliding or the like when the battery pack is attached and detached in addition to being caused by vibration during use. And if the guide rail wears, the looseness of the battery pack in the mounted state may increase. In this case, there is a possibility that the workability of the hammer drill may deteriorate.

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

Means for Solving the Problem

[0006] One or more embodiments of the present invention include a motor, a housing that houses the motor, an operating portion that operates in response to the driving force of the motor, a battery pack that supplies power to the motor and has a portion to be attached, and a battery attachment portion provided on the housing and holding the portion to be attached that is attached from one side in a first direction. The battery attachment portion includes an engaging portion that engages with the portion to be attached, and a protective member that covers the surface of the engaging portion and intervenes between the engaging portion and the portion to be attached to protect the engaging portion. The protective member is a working machine that intervenes between the portion to be attached and the engaging portion in all directions of the first direction, a second direction orthogonal to the first direction, and a third direction orthogonal to the first direction and the second direction.

[0007] One or more embodiments of the present invention are working machines in which the protective member is composed of an indivisible single member.

[0008] One or more embodiments of the present invention are such that the portion to be attached has a latch that is pulled into the battery pack by being operated by an operator, the engaging portion has a first engaging portion that engages with the latch in the first direction to limit the movement of the battery pack in one side in the first direction, the protective member has a first protect portion that covers the surface of the first engaging portion, and the first protect portion is a working machine that intervenes between the first engaging portion and the latch in the first direction.

[0009] One or more embodiments of the present invention are such that the battery attachment portion has a sliding portion on which the latch slides when the portion to be attached is attached to the battery attachment portion. The sliding portion is disposed on one side in the first direction with respect to the first engaging portion, and the first protect portion has a cover portion that covers the sliding portion.

[0010] One or more embodiments of the present invention are work machines in which a groove portion is formed in the sliding portion, an insertion piece inserted into the groove portion is provided in the first protection portion, and a return portion that bites into the inner peripheral portion of the groove portion to suppress the insertion piece from falling off from the groove portion is provided in the insertion piece.

[0011] One or more embodiments of the present invention are work machines in which the engaging portion has a second engaging portion that engages with the attached portion in the second direction and the third direction, the protective member has a second protection portion that covers the surface of the second engaging portion, and the second protection portion is interposed between the second engaging portion and the attached portion in the second direction and the third direction.

[0012] One or more embodiments of the present invention are work machines in which the protective member is formed in a long shape extending in the first direction, the insertion piece constitutes one end portion of the protective member in the first direction, the second protection portion is located on the other side of the first protection portion in the first direction, and the other end portion of the protective member in the first direction is fixed to the battery attachment portion by a screw.

[0013] One or more embodiments of the present invention are work machines in which the first engaging portion and the first protection portion are formed in a concave shape in which the latch can be arranged, and the first protection portion is fixed to the first engaging portion by a screw.

[0014] One or more embodiments of the present invention are work machines in which the protective member is made of metal.

[0015] One or more embodiments of the present invention include a motor, a housing that houses the motor, an operating unit that operates in response to the driving force of the motor, a battery pack that supplies power to the motor and has a mounting portion, and a battery mounting portion that is provided on the housing and holds the mounting portion mounted from one side in a first direction. The battery pack includes a pair of battery-side rail portions that are spaced apart in a second direction orthogonal to the first direction. The battery mounting portion includes a pair of housing-side rail portions that are spaced apart in the second direction, and a protective member that covers the surfaces of each of the pair of housing-side rails and is interposed between the pair of housing-side rail portions and the pair of battery-side rail portions to protect the pair of housing-side rail portions. A pair of rail-side protection portions that cover the pair of housing-side rails in the protective member are formed of a single metal plate as a single part connected to each other, which is a working machine.

Advantages of the Invention

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

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0018] (First Embodiment) Hereinafter, with reference to Figs. 1 to 5, the hammer drill 10 as a working machine according to the first embodiment will be described. The hammer drill 10 is a power tool for performing drilling work or the like on a workpiece. In the drawings, the arrows UP, FR, and LH appropriately shown indicate the upper side, the front side, and the left side of the hammer drill 10. In the following description, when using the up-down, front-back, and left-right directions for explanation, unless otherwise specified, they indicate the up-down direction, the front-back direction, and the left-right direction of the hammer drill 10. And the front-back direction corresponds to the first direction of the present invention, the left-right direction corresponds to the second direction of the present invention, and the up-down direction corresponds to the third direction of the present invention. Further, in the drawings, for the sake of convenience, hatching is appropriately omitted.

[0019] As shown in FIG. 1, the hammer drill 10 includes a housing 12, a motor 33 housed in the housing 12, a power transmission mechanism 40 as an operating part for transmitting the driving force of the motor 33 to the tip tool T, and a battery pack 70. Further, the hammer drill 10 has a mode switching mechanism part 64. By operating the switching lever 65 of the mode switching mechanism part 64, the transmission path to the tip tool T in the power transmission mechanism 40 is switched, and the hammer drill 10 is configured to switch to a hammer mode for applying an impact force to the tip tool T or a hammer drill mode for applying a rotational force and an impact force to the tip tool T. Furthermore, the hammer drill 10 has a battery attachment structure S for attaching the battery pack 70 to the housing 12. Hereinafter, each component of the hammer drill 10 will be described.

[0020] (Regarding the housing 12) The housing 12 is formed in a hollow shape and constitutes the outer shell of the hammer drill 10. The housing 12 has a main body housing 14 and a handle 16 disposed on the rear side of the main body housing 14. The main body housing 14 extends in the front-rear direction, and the rear end portion of the main body housing 14 protrudes downward. The main body housing 14 is composed of a plurality of housing members.

[0021] The handle 16 extends in the vertical direction, and the upper end portion and the lower end portion of the handle 16 are connected to the main body housing 14 by an anti-vibration mechanism 18 so as to be relatively movable in the front-rear direction. The lower end portion of the handle 16 is located above the lower end portion of the main body housing 14, and a battery attachment portion 20 for attaching the battery pack 70 is formed at the lower end portion of the handle 16. The battery attachment portion 20 will be described later.

[0022] On the upper end side portion of the handle 16, a trigger 30 is provided. The trigger 30 protrudes forward from the handle 16 so that it can be pulled backward. Inside the handle 16, a switch 31 is provided on the rear side of the trigger 30. When the trigger 30 is pulled by the operator, the switch 31 is turned on. The switch 31 is electrically connected to a controller 32 provided at the lower end of the main body housing 14, and outputs an output signal corresponding to the operation state of the trigger 30 to the controller 32.

[0023] (Regarding the motor 33) The motor 33 is housed in the lower part of the main body housing 14. The motor 33 has a rotating shaft 33A with the vertical direction as the axial direction. The lower end of the rotating shaft 33A is rotatably supported by a motor bearing 34, and the upper end side portion of the rotating shaft 33A is rotatably supported by a motor bearing 35. The motor bearing 34 is fixed to the main body housing 14, and the motor bearing 35 is fixed to an inner case 41 described later. A pinion gear 33A1 is formed at the upper end of the rotating shaft 33A. The motor 33 is electrically connected to the controller 32 and is driven by the controller 32.

[0024] (Regarding the power transmission mechanism 40) The power transmission mechanism 40 is housed in the inner case 41, and the inner case 41 is housed in the upper part of the main body housing 14. And the aforementioned motor bearing 35 is fixed to the inner case 41, and the rotating shaft 33A of the motor 33 passes through an insertion hole 41A formed in the inner case 41, and the pinion gear 33A1 is arranged inside the inner case 41.

[0025] The power transmission mechanism 40 is configured to include a rotation mechanism 42, a striking mechanism 50, and a crank mechanism 60. The rotation mechanism 42 has a rotation transmission shaft 43 and a transmission gear 44. The rotation transmission shaft 43 is formed in a substantially cylindrical shape with the vertical direction as the axial direction, is disposed in front of the pinion gear 33A1 of the motor 33, and the lower portion of the rotation transmission shaft 43 is rotatably supported by the inner case 41 via a bearing 44. A bevel gear 43A is formed at the upper end portion of the rotation transmission shaft 43. The transmission gear 45 is formed in a substantially disc shape with the vertical direction as the plate thickness direction, and is integrally and rotatably connected to the upper end side portion of the rotation transmission shaft 43. The transmission gear 45 is meshed with the pinion gear 33A1 of the motor 33.

[0026] The striking mechanism 50 is configured to include a cylinder 51, a retainer sleeve 52, a ring gear 53, a clutch 54, a piston 55, a striker 56, and an intermediate member 57. The cylinder 51 and the retainer sleeve 52 are formed in a substantially cylindrical shape with the front-rear direction as the axial direction and are coaxially disposed. Further, the front end portion of the cylinder 51 is fitted into the rear end portion of the retainer sleeve 52, and the cylinder 51 and the retainer sleeve 52 are integrally and rotatably connected. The cylinder 51 and the retainer sleeve 52 are disposed above the rotation mechanism 42. The cylinder 51 and the retainer sleeve 52 are rotatably supported by the inner case 41 and the main body housing 14 via bearings. And the tip tool T is attached to the front end portion of the retainer sleeve 52 and protrudes forward from the front end portion of the main body housing 14.

[0027] The ring gear 53 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, is externally inserted into the rear end side portion of the cylinder 51, and is rotatably supported by the cylinder 51. A bevel gear 53A is formed at the rear end portion of the ring gear 53, and the bevel gear 53A is meshed with the bevel gear 43A of the rotation transmission shaft 43.

[0028] The clutch 54 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and is externally inserted into the cylinder 51 on the rear side of the ring gear 53. The clutch 54 is connected to the cylinder 51 so as to be integrally rotatable and relatively movable in the front-rear direction. The front end portion of the clutch 54 is disposed radially inward of the rear end portion of the ring gear 53 and is engaged with the ring gear 53 in the circumferential direction. Thereby, the driving force of the motor 33 is transmitted to the cylinder 51 by the rotation mechanism 42, the ring gear 53, and the clutch 54, and the cylinder 51 and the retainer sleeve 52 rotate, and a rotational force is applied to the tip tool T. On the other hand, when the clutch 54 is moved rearward by the mode switching mechanism portion 64, the engagement state between the clutch 54 and the ring gear 53 is released, and the transmission of the driving force from the rotation mechanism 42 to the cylinder 51 is blocked.

[0029] Here, the mode switching mechanism portion 64 has a switching lever 65 that is operably exposed upward from the main body housing 14, and the switching lever 65 is configured to be rotatable with the vertical direction as the axial direction. Further, the mode switching mechanism portion 64 has a switching arm 66 that connects the switching lever 65 and the clutch 54. Then, when the switching lever 65 rotates, the ring gear 53 and the clutch 54 are switched between the engaged state and the non-engaged state, and the mode of the hammer drill 10 is switched.

[0030] The piston 55 is formed in a substantially bottomed cylindrical shape that is open to the rear side, and is inserted into the rear portion of the cylinder 51 so as to be relatively movable in the front-rear direction. A piston rod 58 extending in the front-rear direction is provided on the rear side of the piston 55, and the front end portion of the piston rod 58 is rotatably connected to the piston 55 with the vertical direction as the axial direction.

[0031] The striker 56 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and is inserted into the cylinder 51 so as to be relatively movable in the front-rear direction on the front side of the piston 55. The space between the piston 55 and the striker 56 in the cylinder 51 is the air chamber 51A. The intermediate member 57 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and is inserted into the retainer sleeve 52 so as to be relatively movable in the front-rear direction. The intermediate member 57 is disposed adjacent to the front side of the striker 56.

[0032] The crank mechanism 60 includes a crankshaft 61 and a crank gear 62. The crankshaft 61 is disposed with the vertical direction as the axial direction on the rear side of the pinion gear 33A1 of the motor 33, and the lower part of the crankshaft 61 is supported by the inner case 41. The crank gear 62 is formed in a substantially cylindrical shape with the vertical direction as the axial direction. And the crank gear 62 is rotatably supported on the upper part of the crankshaft 61. A gear portion is formed on the outer peripheral portion of the lower end of the crank gear 62, and the gear portion is meshed with the pinion gear 33A1.

[0033] An eccentric shaft 62A is provided on the upper surface of the crank gear 62. The eccentric shaft 62A is formed in a substantially cylindrical shape with the vertical direction as the axial direction and projects upward from the crank gear 62. The eccentric shaft 62A is disposed at a position eccentric with respect to the central axis of the crankshaft 61, and the rear end portion of the piston rod 58 described above is rotatably connected to the eccentric shaft 62A. Thereby, when the motor 33 rotates, the piston 55 reciprocates in the front-rear direction by the crank mechanism 60. Further, when the pressure in the air chamber 51A increases during the forward movement of the piston 55, the striker 56 and the intermediate member 57 move forward, and an impact force along the front-rear direction is applied to the tip tool T.

[0034] (Regarding the battery mounting structure S) The battery mounting structure S includes the battery mounting portion 20 of the housing 12 described above and protection plates 80 as a pair of left and right protection members fixed to the battery mounting portion 20. Hereinafter, the battery pack 70 attached to the battery mounting portion 20 will be described first, and then the battery mounting structure S will be described.

[0035] (Regarding the battery pack 70) As shown in FIGS. 1 to 3, the battery pack 70 has a battery main body portion 71, and the battery main body portion 71 is formed in a substantially rectangular parallelepiped shape. The battery pack 70 has a mounted portion 72 (see FIG. 3) that constitutes the upper end portion of the battery pack 70, and the mounted portion 72 protrudes upward from the battery main body portion 71. Rail grooves 73 (see FIG. 3) as a pair of battery-side rail portions that are provided at intervals in the left-right direction and are open to the outside in the left-right direction are formed at the lower portions of both left and right sides of the mounted portion 72. The rail grooves 73 extend in the front-rear direction, and the front end portion of the rail grooves 73 is open to the front side. A terminal (not shown) is provided in the mounted portion 72. In the state where the battery pack 70 is attached to the battery mounting portion 20, the terminal of the battery pack 70 is connected to the terminal 37 of the terminal unit 36 provided in the battery mounting portion 20 (see FIG. 1). Thereby, power is supplied from the battery pack 70 to the controller 32.

[0036] At the upper end of the battery pack 70, a pair of left and right latches 75 (see FIG. 1) are provided on the rear side of the rail groove 73. The latch 75 has an operation portion 75A and a hook portion 75B (see FIG. 2). The operation portion 75A is exposed so as to be pressable from the left and right side portions of the battery pack 70. The hook portion 75B protrudes outward in the left-right direction (width direction) from the attached portion 72 of the battery pack 70 and is disposed inside the rear end side of the rail groove 73. Then, when an operator presses the operation portion 75A of the latch 75 inward in the left-right direction, the latch 75 moves inward in the left-right direction, and the hook portion 75B is drawn into the battery pack 70 from the rail groove 73. Note that the latch 75 is biased outward in the left-right direction by a biasing member (not shown), and when the operation on the operation portion 75A by the operator is released, the latch 75 moves outward in the left-right direction.

[0037] (Regarding the battery mounting portion 20) As shown in FIGS. 1 to 5, the battery mounting portion 20 is provided at the lower end of the handle 16. The battery mounting portion 20 is formed in a concave shape that is open to the rear side and the lower side. A terminal unit 36 is provided in the battery mounting portion 20, and the terminal 37 of the terminal unit 36 is connected to the terminal of the battery pack 70. The battery mounting portion 20 is provided with a pair of guide rails 21 as housing side rail portions that are spaced apart in the left-right direction. The guide rail 21 is formed in a substantially rectangular column shape extending in the front-rear direction, and protrudes inward in the left-right direction from the lower end portions of the left and right side walls in the battery mounting portion 20 (see FIG. 3).

[0038] As shown in FIGS. 4(A) and 4(B), a latching engagement recess 22 is formed as an engaging portion and a first engaging portion at the rear end side portion of the guide rail 21. The latching engagement recess 22 is formed in a concave shape that is open inward in the left-right direction and penetrates in the up-down direction. And the rear end portion (the portion behind the latching engagement recess 22) of the guide rail 21 is a rail end portion 23 as a sliding portion. The rear surface of the latching engagement recess 22 is an engaging surface 22A, and the engaging surface 22A also constitutes the front surface of the rail end portion 23. The engaging surface 22A is formed along a surface orthogonal to the front-rear direction.

[0039] The rail end portion 23 has a front sliding surface 23A and a rear sliding surface 23B that constitute the outer peripheral surface of the rail end portion 23. The front sliding surface 23A linearly extends rearward from the inner end portion in the left-right direction of the engaging surface 22A when viewed from the up-down direction. The rear sliding surface 23B extends rearward from the rear end portion of the front sliding surface 23A and is inclined outward in the left-right direction as it goes rearward when viewed from the up-down direction. The rear end portion of the rear sliding surface 23B is connected to the rear surface of the guide rail 21. A fixing groove 23C is formed as a groove portion for fixing a fixing piece 83B of a protection plate 80 described later at the rear end portion of the front sliding surface 23A. The fixing groove 23C is formed in a groove shape extending in the up-down direction, and the groove width of the fixing groove 23C is set to be slightly larger than the plate thickness of the protection plate 80 described later.

[0040] On the side surface of the guide rail 21, a pair of front and rear fixing recesses 24 for fixing a protection plate 80 described later are formed. The fixing recess 24 is formed in a concave shape that is open inward in the left-right direction. The depth of the fixing recess 24 is shallower than the depth of the latching engagement recess 22. The rear fixing recess 24 is located in front of the latching engagement recess 22, and the front fixing recess 24 is located at the front end side portion of the guide rail 21. Also, the portion between the pair of fixing recesses 24 in the guide rail 21 is a rail engagement portion 25 as an engaging portion and a second engaging portion.

[0041] Then, by attaching the attached portion 72 of the battery pack 70 to the battery attachment portion 20 from the rear side, the battery pack 70 is held by the battery attachment portion 20. Specifically, the battery pack 70 positioned on the rear side with respect to the battery attachment portion 20 is moved forward, and the guide rail 21 of the battery attachment portion 20 is inserted into the rail groove 73 of the battery pack 70 to attach the battery pack 70 to the battery attachment portion 20. In the state where the battery pack 70 is attached to the battery attachment portion 20, the hook portion 75B of the latch 75 in the battery pack 70 is disposed in the latch engagement recess 22 of the guide rail 21, and the engagement surface 22A between the hook portion 75B and the latch engagement recess 22 engages in the front-rear direction via a protection plate 80 described later. Thereby, the backward movement of the battery pack 70 is restricted, and the attached state of the battery pack 70 is maintained. Further, in the state where the battery pack 70 is attached to the battery attachment portion 20, the rail engagement portion 25 of the guide rail 21 and the rail groove 73 of the battery pack 70 engage in the vertical direction and the left-right direction via a protection plate 80 described later, so that the movement of the battery pack 70 in the vertical direction and the left-right direction is restricted.

[0042] (Regarding the protection plate 80) As shown in FIGS. 3, 4(A) and (B), the protection plate 80 is attached to the guide rail 21 so as to cover the surface of the guide rail 21 of the battery attachment portion 20, and is configured as a member for protecting the guide rail 21. More specifically, the protection plate 80 functions as a member for covering the engagement surfaces of the latch engagement recess 22 and the rail engagement portion 25 of the guide rail 21 that engage with the battery pack 70, and protecting the latch engagement recess 22 and the rail engagement portion 25. The pair of left and right protection plates 80 are configured symmetrically with respect to the center portion in the left-right direction of the battery attachment portion 20. Therefore, hereinafter, the configuration of the protection plate 80 will be described using the left protection plate 80.

[0043] The protective plate 80 is made of metal. The protective plate 80 is formed in a substantially elongated plate shape with the left - right direction as the plate - thickness direction and the front - rear direction as the longitudinal direction, and is bent into a predetermined shape. The protective plate 80 includes a front - side protective portion 81 as a second protect portion constituting the front - end - side portion of the protective plate 80, a pair of front - and - rear plate fixing portions 82, and a rear - side protective portion 83 as a first protect portion constituting the rear - end portion of the protective plate 80.

[0044] The front - side protective portion 81 is bent into a substantially concave shape that is open to the outside in the left - right direction when viewed from the front - rear direction, and extends in the front - rear direction. In the state where the protective plate 80 is attached to the guide rail 21, the rail engaging portion 25 of the guide rail 21 is disposed within the protective plate 80, and the protective plate 80 covers the rail engaging portion 25 from both the upper and lower sides and the inner side in the left - right direction. Thus, in the state where the battery pack 70 is attached, the upper wall and the lower wall of the front - side protective portion 81 are interposed between the rail engaging portion 25 and the rail groove 73 of the battery pack 70 in the vertical direction. Also, the side walls of the front - side protective portion 81 are interposed between the rail engaging portion 25 and the rail groove 73 in the left - right direction. Note that a stepped portion 21A (see FIG. 3) that is recessed by one step is formed on the surface of the guide rail 21, and the protective plate 80 is disposed within the stepped portion 21A. In the state where the protective plate 80 is attached to the guide rail 21, the surface of the protective plate 80 and the surface of the guide rail 21 are arranged flush with each other by the stepped portion 21A.

[0045] The plate fixing portions 82 are respectively provided on both sides in the front-rear direction of the front protective portion 81. When viewed from below, the rear plate fixing portion 82 is bent into a substantially U-shaped form that is open inward in the left-right direction and protrudes outward in the left-right direction from the protective plate 80. Also, when viewed from below, the front plate fixing portion 82 is bent into a substantially L-shaped form and protrudes outward in the left-right direction from the protective plate 80. The front plate fixing portion 82 constitutes the front end portion of the protective plate 80. In the state where the protective plate 80 is attached to the guide rail 21, a pair of front and rear plate fixing portions 82 are fitted into the fixing recesses 24 of the guide rail 21. A fixing hole 82A is formed through the plate fixing portion 82. And a fixing screw SC as a screw is inserted into the fixing hole 82A, screwed into the guide rail 21, and the protective plate 80 is fixed to the guide rail 21 by the fixing screw SC.

[0046] The rear protective portion 83 is bent into a substantially U-shaped form that is open inward in the left-right direction when viewed from the up-down direction so as to cover the latch engaging recess 22 of the guide rail 21 and the front portion of the rail end portion 23. Also, the front opening of the rear protective portion 83 is bent forward and connected to the rear end portion of the rear plate fixing portion 82. Further, the rear opening of the rear protective portion 83 is bent rearward and covers the front sliding surface 23A of the rail end portion 23 from the inside in the left-right direction. Here, the portion of the rear protective portion 83 that covers the front sliding surface 23A is the first cover portion 83A as a cover portion.

[0047] In the state where the battery pack 70 is attached to the battery attachment portion 20, the hook portion 75B of the latch 75 is disposed inside the rear protective portion 83. Thereby, in the front-rear direction, the rear wall of the rear protective portion 83 is interposed between the engaging surface 22A of the latch engaging recess 22 and the latch 75 (hook portion 75B).

[0048] The rear protection portion 83 has fixing pieces 83B as insertion pieces bent outward in the left - right direction at the rear end portion of the first cover portion 83A. The fixing pieces 83B are arranged with the front - rear direction as the plate - thickness direction and are inserted into the fixing grooves 23C of the guide rails 21. As shown in FIG. 5, return portions 83C protruding outward in the up - down direction are respectively formed at the tip portions of the fixing pieces 83B. The return portions 83C are formed in a substantially wedge shape when viewed from the plate - thickness direction of the fixing pieces 83B. And in the state where the fixing pieces 83B are inserted into the fixing grooves 23C, the return portions 83C bite into the upper and lower inner peripheral portions of the fixing grooves 23C, and restrict the movement of the fixing pieces 83B inward in the left - right direction by the return portions 83C.

[0049] (Function and effect) Next, the operation and effects of this embodiment will be described.

[0050] In the hammer drill 10 configured as described above, when attaching the battery pack 70 to the battery attachment portion 20, the battery pack 70 is arranged behind the battery attachment portion 20. Then, the battery pack 70 is moved forward with respect to the battery attachment portion 20, and the guide rail 21 of the battery attachment portion 20 is inserted into the rail groove 73 of the battery pack 70. Thereby, the battery pack 70 is attached to the battery attachment portion 20. Specifically, the rail engaging portion 25 of the guide rail 21 in the battery attachment portion 20 and the rail groove 73 of the battery pack 70 engage in the up - down direction and the left - right direction via the front protection portion 81 of the protection plate 80. Also, the hook portion 75B of the latch 75 in the battery pack 70 is arranged in the latch engaging recess 22 of the guide rail 21, and the engaging surface 22A of the latch engaging recess 22 and the hook portion 75B engage in the front - rear direction via the rear protection portion 83 of the protection plate 80. Thereby, the battery pack 70 is held by the battery attachment portion 20. Note that when attaching the battery pack 70 to the battery attachment portion 20, the hook portion 75B of the latch 75 slides on the rear sliding surface 23B of the guide rail 21 and also slides on the first cover portion 83A of the protection plate 80.

[0051] Here, the guide rail 21 has a rail engaging portion 25 that engages with the rail groove 73 of the battery pack 70, and a latch engaging recess 22 that engages with the latch 75 (hook portion 75B thereof) of the battery pack 70. Further, a protection plate 80 is provided on the guide rail 21, and the protection plate 80 covers the surfaces of the rail engaging portion 25 and the latch engaging recess 22 of the guide rail 21. Specifically, the front protection portion 81 of the protection plate 80 covers the rail engaging portion 25 from both sides in the vertical direction and the inner side in the horizontal direction, and is interposed between the rail groove 73 and the rail engaging portion 25 in the vertical direction and the horizontal direction. Further, the rear wall of the rear protection portion 83 of the protection plate 80 covers the engaging surface 22A of the latch engaging recess 22 from the front side, and is interposed between the latch 75 and the latch engaging recess 22 in the front-rear direction. That is, the protection plate 80 is interposed between the attached portion 72 (rail groove 73 and latch 75) of the battery pack 70 and the guide rail 21 (rail engaging portion 25 and latch engaging recess 22) of the battery attachment portion 20 in all directions of the front-rear direction, the horizontal direction, and the vertical direction. In other words, the protection plate 80 covers all of the surfaces that are engaged with the battery pack 70 in the battery attachment portion 20. Thereby, the rail engaging portion 25 and the latch engaging recess 22 that are engaged with the attached portion 72 of the battery pack 70 in the battery attachment portion 20 can be protected by the protection plate 80. As a result, wear and the like of the rail engaging portion 25 and the latch engaging recess 22 can be reduced. Therefore, rattling of the battery pack 70 can be suppressed, and the mounted state of the battery pack 70 can be maintained favorably. Accordingly, the workability of the hammer drill 10 can be improved.

[0052] Further, the protection plate 80 is composed of an integral member that cannot be disassembled. Thereby, for example, compared with a configuration in which the protection plate 80 is divided into a front protection portion 81 and a rear protection portion 83, it is possible to contribute to cost reduction of the protection plate 80 and to contribute to reduction of the assembly man-hours.

[0053] Further, the rear protection portion 83 of the protection plate 80 has a first cover portion 83A, and the first cover portion 83A covers the front sliding surface 23A of the rail end portion 23 in the guide rail 21 from the inner side in the left-right direction. When the battery pack 70 is attached to the battery attachment portion 20, the hook portion 75B of the latch 75 slides on the first cover portion 83A. Therefore, wear of the front sliding surface 23A in the rail end portion 23 can be reduced.

[0054] Further, a fixing groove 23C is formed in the rail end portion 23, and the fixing piece 83B of the protection plate 80 is inserted into the fixing groove 23C. Further, return portions 83C are formed at both upper and lower ends in the vertical direction of the fixing piece 83B, and the return portions 83C bite into the inner peripheral portion of the fixing groove 23C to suppress the fixing piece 83B from falling out of the fixing groove 23C. Thereby, the rear protection portion 83 can be favorably fixed to the latch engagement recess 22 by the fixing piece 83B.

[0055] Further, the protection plate 80 is formed in a substantially long plate shape extending in the front-rear direction. The rear end portion of the protection plate 80 is constituted by the fixing piece 83B, the front end portion of the protection plate 80 is constituted by the plate fixing portion 82, and the plate fixing portion 82 is fixed to the guide rail 21 by a fixing screw SC. Further, the rear protection portion 83 is located on the front side of the fixing piece 83B, and the front protection portion 81 is located on the front side of the rear protection portion 83. Thereby, in the protection plate 80, the protection plate 80 is fixed to the guide rail 21 outside the front and rear directions of the front protection portion 81 and the rear protection portion 83. Therefore, the fixed state of the protection plate 80 to the guide rail 21 can be favorably maintained.

[0056] (Regarding Modification Example 1 of the Protection Plate 80) Next, with reference to FIG. 6, a first modification of the protective plate 80 will be described. In FIG. 6, parts having the same configuration as those in the first embodiment are denoted by the same reference numerals. In the first modification, the fixing groove 23C of the rail end portion 23 in the guide rail 21 is formed at the middle portion in the front-rear direction of the rear sliding surface 23B. For this reason, a second cover portion 83D as a cover portion covering the front portion of the rear sliding surface 23B is formed in the rear protection portion 83 of the protective plate 80. The second cover portion 83D extends rearward from the rear end portion of the first cover portion 83A and is inclined outward in the left-right direction as it goes rearward when viewed from the up-down direction. And the fixing piece 83B is bent outward in the left-right direction at the rear end portion of the second cover portion 83D and inserted into the fixing groove 23C. Thereby, when the battery pack 70 is attached to the battery attachment portion 20, the hook portion 75B of the latch 75 slides on the second cover portion 83D and the first cover portion 83A. Therefore, in the first modification, wear of the rear sliding surface 23B in the latch engaging recess 22 can be reduced.

[0057] (Regarding the second modification of the protective plate 80) Next, with reference to FIG. 7, a second modification of the protective plate 80 will be described. In FIG. 7, parts having the same configuration as those in the first embodiment are denoted by the same reference numerals. In the second modification, a second cover portion 83D is formed in the rear protection portion 83 of the protective plate 80 in the same manner as in the first modification, and the second cover portion 83D covers the entire rear sliding surface 23B of the rail end portion 23. Further, the fixing piece 83B extends outward in the left-right direction from the rear end portion of the second cover portion 83D and covers the rear surface of the guide rail 21. Thereby, also in the second modification, similar to the first modification, wear of the rear sliding surface 23B in the latch engaging recess 22 can be reduced.

[0058] Further, in Modification 2, the rear plate fixing portion 82 in the protection plate 80 is omitted. And the head of the fixing screw SC is disposed within the rear protection portion 83, and the rear protection portion 83 is fixed to the guide rail 21 by the fixing screw SC. Thus, in Modification 2, the head of the fixing screw SC is disposed by utilizing the rear protection portion 83 that houses the hook portion 75B of the latch 75 in the rear protection portion 83, and the rear protection portion 83 can be directly fixed to the guide rail 21 by the fixing screw SC.

[0059] (Regarding Modification 3 of the protection plate 80) Next, with reference to FIG. 8, Modification 3 of the protection plate 80 will be described. In FIG. 8, parts having the same configuration as those in the first embodiment are denoted by the same reference numerals. In this Modification 3, similar to Modification 2, a second cover portion 83D is formed in the rear protection portion 83 of the protection plate 80, and the second cover portion 83D covers the entire rear sliding surface 23B of the rail end portion 23. Further, the fixing piece 83B extends outward in the left - right direction from the rear end portion of the second cover portion 83D and covers the rear surface of the guide rail 21. Thus, similar to Modification 2, wear of the rear sliding surface 23B in the latch engaging recess 22 can be reduced. Also, in Modification 3, similar to Modification 2, the rear plate fixing portion 82 in the protection plate 80 is omitted. Further, the tip of the fixing piece 83B is bent forward and inserted into a groove 23D formed in the rear end portion of the guide rail 21 (rail end portion 23), and is engaged with the guide rail 21 in the left - right direction. Thus, in Modification 3, compared with Modification 2, while omitting the rear fixing screw SC, the rear end portion of the protection plate 80 can be fixed to the guide rail 21. Therefore, in Modification 3, it can contribute to reducing the number of parts.

[0060] (Second Embodiment) Next, with reference to FIGS. 9 to 12, the hammer drill 100 as a working machine of the second embodiment will be described. In FIGS. 9 to 12, parts having the same configuration as those of the hammer drill 10 in the first embodiment are denoted by the same reference numerals.

[0061] In the hammer drill 100, except for the battery pack 70 and the battery mounting structure S, it is configured in the same manner as the hammer drill 10 of the first embodiment. In the battery pack 70 of the second embodiment, the hook portion 75B of the latch 75 protrudes upward from the rear portion of the mounted portion 72 in the battery pack 70 (see FIG. 11). Then, when the operation portion 75A of the latch 75 (not shown in FIGS. 9 to 12) is pressed, the hook portion 75B moves downward and is drawn into the battery pack 70.

[0062] Therefore, in the battery mounting structure S of the second embodiment, an engaging portion configured to be engageable with the hook portion 75B of the latch 75 in the battery pack 70 and the latch engaging recess 26 as the first engaging portion (see FIG. 11) are formed in the battery mounting portion 20. The latch engaging recess 26 is formed in a groove shape that is open downward and extends in the left - right direction. The rear surface of the latch engaging recess 26 is an engaging surface 26A, and the engaging surface 26A is formed along a surface orthogonal to the front - rear direction. In the state where the battery pack 70 is mounted on the battery mounting portion 20, the hook portion 75B of the latch 75 in the battery pack 70 is inserted into the latch engaging recess 26, and the hook portion 75B and the engaging surface 26A are engaged in the front - rear direction, so that the backward movement of the battery pack 70 is restricted. Further, in the battery mounting portion 20 of the second embodiment, the portion excluding the front end portion of the guide rail 21 is a rail engaging portion 27 (see FIGS. 10 and 11) as the engaging portion and the second engaging portion.

[0063] Further, in the second embodiment, a protection plate 110 as a protection member is provided on the battery mounting portion 20 instead of the protection plate 80 of the first embodiment. The protection plate 110 includes a pair of left - and - right rail - side protection portions 111 as the second protection portions and a connecting plate 113 that connects the pair of rail - side protection portions 111. That is, the pair of rail - side protection portions 111 are configured as single components connected to each other via the connecting plate 113 and are formed of a single metal plate.

[0064] The rail-side protection part 111 extends in the front-rear direction and is bent into a substantially U-shaped form that is open to the outside in the left-right direction when viewed from the front-rear direction. In the state where the protection plate 110 is attached to the battery attachment part 20, the guide rail 21 of the battery attachment part 20 is inserted into the inside of the rail-side protection part 111, and the rail-side protection part 111 covers the guide rail 21 from both sides in the vertical direction and the inside in the left-right direction. A plate fixing part 112 is formed at the front end part of the rail-side protection part 111, and the plate fixing part 112 is bent into a substantially crank shape that protrudes inward in the left-right direction when viewed from above. And the plate fixing part 112 is fixed to the guide rail 21 of the battery attachment part 20 by a fixing screw SC.

[0065] The connecting plate 113 is formed in a substantially long plate shape with the vertical direction as the plate thickness direction and extending in the left-right direction. Connecting pieces 113A bent downward are formed at both ends in the left-right direction of the connecting plate 113, and the lower end parts of the connecting pieces 113A are bent inward in the left-right direction and are connected to the rear end part of the upper wall of the rail-side protection part 111.

[0066] A latch-side protection part 114 as a first protection part is formed at the intermediate part in the left-right direction of the rear end part of the connecting plate 113. The latch-side protection part 114 is bent obliquely upward and rearward, and the upper end part of the latch-side protection part 114 is bent downward. The latch-side protection part 114 is fitted into the latch engagement recess 26 of the battery attachment part 20 and covers the surface of the latch engagement recess 26.

[0067] And in the state where the battery pack 70 is attached to the battery attachment portion 20, the rail-side protection portion 111 of the protection plate 110 covers the rail engagement portion 27 of the guide rail 21 from both the upper and lower sides and the inner sides in the left and right directions, and is interposed between the rail groove 73 of the battery pack 70 and the rail engagement portion 27 in the vertical and horizontal directions. Further, the rear end portion of the latch-side protection portion 114 of the protection plate 110 covers the engagement surface 26A of the latch engagement recess 26 from the front side and is interposed between the hook portion 75B of the latch 75 and the latch engagement recess 26 in the front-rear direction. Thus, also in the second embodiment, the protection plate 110 is interposed between the attached portion 72 (rail groove 73 and latch 75) and the guide rail 21 (rail engagement portion 27 and latch engagement recess 26) in all directions of the front-rear direction, left-right direction, and up-down direction. Therefore, also in the second embodiment, similar to the first embodiment, the latch engagement recess 26 and the rail engagement portion 27 that are engaged with the attached portion 72 of the battery pack 70 in the battery attachment portion 20 can be protected by the protection plate 110. Thus, the workability of the hammer drill 100 can be improved.

[0068] Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

Explanation of Reference Numerals

[0069] 10 Hammer drill (working machine) 12 Housing 20 Battery attachment portion 21 Guide rail (housing-side rail portion) 22 Latch engagement recess (engagement portion, first engagement portion) 23 Rail end portion (sliding portion) 25 Front-side engagement portion (engagement portion, second engagement portion) 26 Latch engagement recess (engagement portion, first engagement portion) 27 Rail engagement portion (engagement portion, second engagement portion) 29 Motor 40 Power transmission mechanism (operating portion) 70 Battery pack 73 Rail groove (battery side rail part) 75 Latch 80 Protection plate (protection member) 81 Front protection part (second protection part) 83 Rear protection part (first protection part) 83A First cover part (cover part) 83B Fixed piece (insertion piece) 83D Second cover part (cover part) 100 Hammer drill (working machine) 110 Protection plate (protection member) 111 Rail side protection part (second protection part) 114 Latch side protection part (first protection part) SC Fixing screw (screw)

Claims

1. A motor, a housing that houses the motor, an operating part that operates by receiving the driving force of the motor, a battery pack that supplies power to the motor and has a mounting part, a battery mounting part that is provided on the housing and holds the mounting part that is mounted from one side in the first direction, comprising: the battery mounting part has an engaging part that engages with the mounting part, and a protection member that covers the surface of the engaging part and intervenes between the engaging part and the mounting part to protect the engaging part, is configured to include, the working machine in which the protection member intervenes between the mounting part and the engaging part in all directions of the first direction, a second direction orthogonal to the first direction, and a third direction orthogonal to the first direction and the second direction.

2. The working machine according to claim 1, wherein the protection member is composed of an indivisible single member.

3. The mounting part has a latch that is pulled into the battery pack by being operated by an operator, the engaging part has a first engaging part that engages with the latch in the first direction to limit the movement of the battery pack in one side in the first direction, the protection member has a first protection part that covers the surface of the first engaging part, The working machine according to claim 1, wherein the first protection part intervenes between the first engaging part and the latch in the first direction.

4. The battery mounting part has a sliding part on which the latch slides when the mounting part is attached to the battery mounting part, and the sliding part is disposed on one side in the first direction with respect to the first engaging part, The working machine according to claim 3, wherein the first protection part has a cover part that covers the sliding part.

5. A groove part is formed in the sliding part, a plug piece that is inserted into the groove part is provided in the first protection part, The working machine according to claim 4, wherein the plug piece is provided with a return part that bites into the inner peripheral part of the groove part to suppress the dropout of the plug piece from the groove part.

6. The engaging part has a second engaging part that engages with the mounting part in the second direction and the third direction, the protection member has a second protection part that covers the surface of the second engaging part, The working machine according to claim 5, wherein the second protection part intervenes between the second engaging part and the mounting part in the second direction and the third direction.

7. The protection member is formed in an elongated shape extending in the first direction, The insertion piece constitutes one end portion of the protection member in the first direction, The second protection portion is located on the other side in the first direction with respect to the first protection portion, The work machine according to claim 6, wherein the other end portion of the protection member in the first direction is fixed to the battery mounting portion by a screw.

8. The first engaging portion and the first protection portion are formed in a concave shape so as to be able to dispose the latch, The work machine according to claim 7, wherein the first protection portion is fixed to the first engaging portion by a screw.

9. The work machine according to claim 2, wherein the protection member is made of metal.

10. A motor, A housing that houses the motor, An operating portion that operates by receiving the driving force of the motor, A battery pack that supplies power to the motor and has a mounting portion to be mounted, A battery mounting portion that is provided on the housing and holds the mounting portion to be mounted, which is mounted from one side in the first direction, Comprising: The battery pack includes a pair of battery-side rail portions that are spaced apart in a second direction orthogonal to the first direction, The battery mounting portion is A pair of housing-side rail portions that are spaced apart in the second direction, A protection member that covers each surface of the pair of housing-side rails and is interposed between the pair of housing-side rail portions and the pair of battery-side rail portions to protect the pair of housing-side rail portions, Is configured to include, The work machine, wherein a pair of rail-side protection portions that respectively cover the pair of housing-side rails in the protection member are formed of a single metal plate as a single part connected to each other.

Images