Work equipment

Abstract

To improve workability.SOLUTION: In a grinder 10, a cover filter 84 for covering an intake port 24A is detachably mounted on an outer peripheral section of a rear housing section 24 of a housing 20. The outer peripheral section of the rear housing section 24 is covered with a rubber section 25 composed of an elastic material. In the rubber section 25, an engaging rib 82E is provided. By engaging a frame section 86 of the cover filter 84 with the engaging rib 82E, a mounting state of the cover filter 84 is maintained. As a result, the mounting state of the cover filter 84 can be maintained by the housing 20. By elastically deforming the engaging rib 82E when removing the cover filter 84, the cover filter 84 can be easily removed from the housing 20. Thus, workability when detaching the cover filter 84 can be improved.SELECTED DRAWING: Figure 3

Description

Technical Field

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

Background Art

[0002] In the disk grinder (working machine) described in Patent Document 1 below, an air inlet is formed in the housing, and the air inlet is covered by a filter (cover) detachably attached to the housing. Specifically, when attaching the filter to the housing, the battery is removed from the housing, and the filter is slid forward and attached to the rail portion of the housing. After attaching the filter to the housing, by attaching the battery to the housing, the backward slide of the filter is restricted by the battery. Thereby, the attached state of the filter is maintained.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above disk grinder has room for improvement in the following points. That is, in the above disk grinder, as described above, when attaching and detaching the filter to and from the housing, it is necessary to remove the battery from the housing. Therefore, it is necessary to remove the battery from the housing for each attachment and detachment operation of the filter, and the attachment and detachment operation of the filter becomes complicated. Therefore, the above disk grinder has room for improvement in terms of improving the workability when attaching and detaching the filter (cover).

[0005] In consideration of the above facts, an object of the present invention is to provide a working machine capable of improving the workability when attaching and detaching a cover. [Means for solving the problem]

[0006] One or more embodiments of the present invention include a drive unit that provides driving force to a cutting tool, and a housing that houses the drive unit, before It is integrally formed with the housing and is made of an elastic material having elasticity, and has a covering portion that covers the outer periphery of the housing, A cover that covers a part of the housing when attached to the housing, The covering portion is provided and engages with the cover. The state in which it is attached to the housing. It comprises an engaging portion that maintains the relationship The cover can be removed from the housing, whose outer periphery is covered by the covering portion, by disengaging it from the engaging portion, and can also be attached to the housing by engaging it with the engaging portion. It is a work machine.

[0007] One or more embodiments of the present invention are a work machine in which the cover is formed in the shape of a plate and is attached to the housing from one side in a direction perpendicular to the thickness direction of the cover, and the engaging portion engages with the cover in a direction perpendicular to it to restrict the movement of the cover to one side in that direction perpendicular to it.

[0008] One or more embodiments of the present invention are work machines in which the cover has an engaging portion and an engaged portion configured to be engaged in the orthogonal direction.

[0009] One or more embodiments of the present invention are a work machine in which a recessed cover mounting portion is formed on the outer periphery of the housing for attaching the cover, the engaging portion protrudes outward from the bottom surface of the cover mounting portion in the thickness direction of the cover, and the cover covers the engaging portion from the outside in the thickness direction.

[0010] One or more embodiments of the present invention are working machines in which the housing comprises a first housing portion to which the cover is attached, and a second housing portion arranged on one side of the first housing portion in the orthogonal direction and configured as a handle portion, wherein the width dimension of the second housing portion is set to be smaller than the width dimension of the first housing portion, and the covering portion covers the first housing portion and the second housing portion.

[0011] One or more embodiments of the present invention are work machines in which the first housing portion is provided with a battery mounting portion for mounting a battery that supplies power to the drive unit, and the battery mounting portion is located on the other side of the cover in the orthogonal direction.

[0012] One or more embodiments of the present invention are work machines in which the housing has an air intake port formed therein for bringing air into the interior, and the cover is a filter that covers the air intake port.

[0013] One or more embodiments of the present invention are a work machine in which the cover is a decorative element that adorns the housing. One or more embodiments of the present invention are work machines in which the engagement between the cover and the engagement portion can be released by elastically deforming the engagement portion. [Effects of the Invention]

[0014] According to one or more embodiments of the present invention, the ease of attaching and detaching the cover can be improved. [Brief explanation of the drawing]

[0015] [Figure 1] This is a side view from the left, showing the disc grinder according to this embodiment. [Figure 2] Figure 1 is a side cross-sectional view from the left, showing the inside of the disc grinder. [Figure 3] Figure 1 is a perspective view showing the disc grinder with the filter removed from the housing. [Figure 4] This is a cross-sectional view (section 4-4 in Figure 1) showing the mounting state of the filter to the housing at the center in the width direction, as seen from one side in the inclined direction. [Figure 5] This is a cross-sectional view (section 5-5 in Figure 1) showing the mounting state of the filter to the housing at the outer end in the width direction, as seen from one side in the inclined direction. [Figure 6] Figure 1 is a diagram showing the filter unit itself. [Figure 7]It is a side view seen from the right showing an example in which a cover mechanism is applied to an impact wrench. [Figure 8] It is a cross-sectional view seen from above showing the state of attachment of the cover plate shown in FIG. 7 to the housing (cross-sectional view taken along line 8-8 of FIG. 7).

Embodiment for Carrying out the Invention

[0016] Hereinafter, with reference to the drawings, a disc grinder 10 (hereinafter simply referred to as grinder 10) as a working machine according to the present embodiment will be described. In the drawings, arrows UP, FR, and LH shown as appropriate indicate the upper side, front side, and left side of the grinder 10, respectively. In the following description, when the up-down, front-back, and left-right directions are used for explanation, unless otherwise specified, they indicate the up-down, front-back, and left-right directions of the grinder 10.

[0017] As shown in FIGS. 1 and 2, the grinder 10 is configured as a tool for performing polishing or the like on a workpiece. Further, the grinder 10 has a cover mechanism 80 that covers an intake port 24A formed in the housing 20. Hereinafter, the overall configuration of the grinder 10 will be described first, and then the cover mechanism 80 of the grinder 10 will be described.

[0018] (Regarding the overall configuration of the grinder 10) The grinder 10 is formed in a substantially cylindrical shape extending in the front-back direction as a whole, and the outer contour of the grinder 10 is constituted by the housing 20. The housing 20 includes a motor housing 21 that constitutes the middle part in the front-back direction of the housing 20, a handle housing 22 that constitutes the rear part of the housing 20, and a gear housing 27 that constitutes the front end part of the housing 20.

[0019] (Regarding the motor housing 21) The motor housing 21 is made of resin and is formed in a roughly bottomed cylindrical shape that is open to the front. The motor 30, which serves as the drive unit, is housed inside the motor housing 21. The motor 30 is electrically connected to a controller 50, which will be described later, and is driven by the control of the controller 50. The motor 30 consists of a rotating shaft 30A, a rotor 30B, and a stator 30C.

[0020] The rotating shaft 30A is oriented axially in the front-rear direction, and its rear end is rotatably supported by a first motor bearing 31 held in the rear wall of the motor housing 21. The front end of the rotating shaft 30A is located inside a gear housing 27, which will be described later, and its front end portion is rotatably supported by a second motor bearing 32 held in the gear housing 27. A pinion gear 33 is fixed to the front end of the rotating shaft 30A. The rotor 30B is located radially outside the rotating shaft 30A and is configured to rotate integrally with the rotating shaft 30A. The stator 30C is formed in a substantially cylindrical shape with its axial direction oriented axially, and is supported by the motor housing 21 radially outside the rotor 30B.

[0021] A fan 34 is integrally mounted and rotatable with the front end portion of the rotating shaft 30A, behind the second motor bearing 32. The fan 34 is configured as an axial flow fan, and is designed to generate an airflow from the rear to the front.

[0022] A fan guide 35 is provided on the radially outer side of the fan 34. The fan guide 35 is formed in a substantially bottomed cylindrical shape that is open to the front, and an insertion portion 35A is formed through the center of the bottom wall of the fan guide 35, through which the rotating shaft 30A of the motor 30 is inserted. The fan guide 35 is assembled to the tip of the stator 30C of the motor 30 and is sandwiched in the front-rear direction between the gear housing 27 and the motor 30, which will be described later.

[0023] The front end of the motor housing 21 has an enlarged diameter portion 21A that extends radially outward, and the enlarged diameter portion 21A is formed in a roughly rectangular shape when viewed from the front. A switch lever 40 (see Figure 1) is provided on the left side of the motor housing 21. The switch lever 40 is connected to the motor housing 21 so as to be slidable in the front-rear direction. Specifically, the switch lever 40 is configured to slide between the off position shown in Figure 1 and the on position (not shown) which is slid forward from the off position.

[0024] A switch holder 21B is integrally provided on the rear wall of the motor housing 21. The switch holder 21B protrudes rearward from the motor housing 21 and is formed in a roughly rectangular box shape that is open to the right. A switch 41 is held in the switch holder 21B. The switch 41 is electrically connected to a controller 50, which will be described later. When the aforementioned switch lever 40 is operated from the off position to the on position, the switch 41 is turned on and outputs an on signal to the controller 50. Specifically, a slide bar 42 is connected to the switch lever 40, and when the switch lever 40 is slid, the slide bar 42 presses against the switch 41. As a result, the switch 41 is turned on and the motor 30 is driven by the controller 50. The slide bar 42 extends in the front-rear direction within the housing 20, and only the rear end of the slide bar 42 is shown in Figure 2.

[0025] (Regarding the handle housing 22) The handle housing 22 is composed of two housing members 22L and 22R (see Figure 3) that are divided in the left-right direction, and the housing members 22L and 22R are made of resin. The housing members 22L and 22R are fastened to each other, sandwiching the switch holding part 21B from both sides in the left-right direction. In this way, the handle housing 22 is connected to the motor housing 21. The front part of the handle housing 22 is configured as a handle part 23, which is a second housing part that the operator grips, and the rear part of the handle housing 22 is configured as a rear housing part 24, which is a first housing part. The rear housing part 24 protrudes from the handle part 23 both vertically and horizontally. That is, the width dimension (left-right dimension) of the rear housing part 24 is set to be larger than the width dimension of the handle part 23.

[0026] The rear housing portion 24 extends in a direction that slopes towards the rear as it moves upward when viewed from the left and right. In the following description, the direction in which the rear housing portion 24 extends when viewed from the left and right will be referred to as the slope direction (see arrows S1 and S2 in Figures 1 and 2), and the direction perpendicular to the slope direction will be referred to as the orthogonal direction (see arrows V1 and V2 in Figures 1 and 2). Also, the side in the direction of arrow S1 in Figures 1 and 2 will be considered one side of the slope direction, and the side in the direction of arrow V1 in Figures 1 and 2 will be considered one side of the orthogonal direction.

[0027] Multiple air intake ports 24A (see Figures 1 and 3) are formed through the left and right side walls of the rear housing portion 24. The air intake ports 24A are formed in the shape of elongated holes with the inclination direction as the longitudinal direction. The air intake ports 24A are covered by a cover filter 84, which is part of a cover mechanism 80 described later, and the cover filter 84 is detachably attached to the housing 20. In addition, most of the outer circumference of the handle housing 22 is covered by a rubber portion 25 (see the gray-filled portion in Figures 1 and 3), which is made of an elastic material such as rubber or elastomer, and the rubber portion 25 is formed integrally with the housing members 22L and 22R. The coefficient of friction of the rubber portion 25 is set to be higher than that of the resin rear housing portion 24.

[0028] The rear housing section 24 houses the controller 50. The controller 50 consists of a controller board 51 and a controller case 52 that houses and holds the controller board 51. The controller case 52 is formed in the shape of a relatively shallow box that is open to one side in the orthogonal direction and is sandwiched from the outside in the left and right directions by housing members 22L and 22R. The controller board 51 is formed in the shape of a substantially rectangular plate with the thickness direction in the orthogonal direction and is placed inside the controller case 52 and held by the controller case 52. The controller 50 is positioned between the left and right air intake ports 24A. As a result, when the fan 34 rotates, an airflow is generated that flows into the handle housing 22 from the air intake ports 24A, and this airflow passes through a hole (not shown) formed in the rear wall of the motor housing 21 and flows forward inside the motor housing 21, cooling the controller 50 and the motor 30.

[0029] At the rear end of the rear housing portion 24, a battery mounting portion 24B is provided on the other side of the air intake port 24A in the direction perpendicular to it, for mounting a battery 44. The battery mounting portion 24B extends along the direction of inclination. The battery mounting portion 24B is formed in a concave shape that is open to one side in the direction of inclination and the other side in the direction perpendicular to it. A terminal unit 45 connected to the battery 44 is provided in the battery mounting portion 24B, and the terminal unit 45 is assembled to the rear housing portion 24 by being sandwiched from the outside in the left and right directions by housing members 22L and 22R. The terminal unit 45 is electrically connected to the controller 50. The battery 44 is detachably mounted to the battery mounting portion 24B from one side in the direction of inclination, and power from the battery 44 is supplied to the controller 50 via the terminal unit 45.

[0030] A speed setting unit 46 is provided at the upper end of the rear housing 24 on one side in the direction of inclination of the controller 50. The speed setting unit 46 is configured as a mechanism for setting the target rotational speed of the motor 30. The speed setting unit 46 includes a rotary potentiometer 47 and an operating dial 48. The operating dial 48 is formed in a disc shape with its thickness direction approximately in the direction of inclination, and is configured to be rotatable with its axial direction approximately in the direction of inclination. A portion of the operating dial 48 is exposed to the rear housing 24 in one direction perpendicular to it so as to be operable. The rotary potentiometer 47 is configured as a rotary variable resistor and is electrically connected to the controller 50. The rotary potentiometer 47 is also connected to the operating dial 48 and outputs an output signal to the controller 50 according to the rotational position of the operating dial 48, and the controller 50 sets the rotational speed of the motor 30's rotation shaft 30A.

[0031] An operating section 60 is provided at the lower end of the rear housing section 24, on the other side of the inclination direction of the controller 50. The operating section 60 is configured as a mechanism for operating the lighting section 77. The operating section 60 includes an operating button 61 and an operating switch 62. The operating button 61 is exposed from the outer circumference of the rear housing section 24 so as to be pressable. The operating switch 62 is configured as a tactile switch or the like and is electrically connected to the controller 50. When the operating button 61 is pressed, the operating switch 62 is turned on, and an ON signal is output from the operating switch 62 to the controller 50.

[0032] (Regarding gear housing 27) The gear housing 27 is formed in a hollow shape that forms a roughly triangular shape when viewed from the left and right directions, and is open to the bottom. A connecting portion 27A is formed at the rear end of the gear housing 27, and the connecting portion 27A is formed in a roughly rectangular cylindrical shape that corresponds to the enlarged diameter portion 21A of the motor housing 21. The connecting portion 27A and the enlarged diameter portion 21A are abutted together in the front-rear direction, and the outer circumference of the connecting portion 27A is fastened and fixed to the enlarged diameter portion 21A. A packing land 70 is provided on the lower side of the gear housing 27. The packing land 70 is formed in a stepped cylindrical shape with the vertical direction as its axial direction, and is fixed to the gear housing 27.

[0033] A spindle 71 is provided inside the gear housing 27, and the spindle 71 is formed in a substantially cylindrical shape with its vertical direction as the axial direction. The upper end of the spindle 71 is rotatably supported by a bearing 72 fixed to the gear housing 27, and the middle part of the spindle 71 in the vertical direction is rotatably supported by a bearing 73 fixed to the packing land 70. A bevel gear 74 is integrally rotatably provided on the upper end portion of the spindle 71, and the pinion gear 33 of the motor 30 is meshed with the bevel gear 74. As a result, the driving force of the motor 30 is transmitted to the spindle 71 by the bevel gear 74. A grinding wheel 75, which serves as a cutting tool, is attached to the lower end of the spindle 71, and the grinding wheel 75 is formed in a substantially circular disc shape with its vertical direction as the thickness direction. As a result, the grinding wheel 75 rotates together with the spindle 71 by the driving force of the motor 30, performing polishing and other processes on the workpiece. Furthermore, a wheel guard 76 is detachably fixed to the lower end of the packing land 70, and the rear of the grinding wheel 75 is covered by the wheel guard 76 from above and behind.

[0034] Illumination units 77 are provided on both the left and right sides of the gear housing 27. The illumination units 77 have a light source such as an LED (not shown), and the light source is electrically connected to the controller 50. The controller 50 causes the light source to emit light, which illuminates the front of the grinding wheel 75.

[0035] (Regarding the cover mechanism 80) As shown in Figures 1, 3 to 6, the cover mechanism 80 is provided on the housing members 22L and 22R of the handle housing 2, respectively, and the cover mechanism 80 covers the air intake port 24A of the housing 20. The cover mechanism 80 provided on housing member 22L and the cover mechanism 90 provided on housing member 22R are configured symmetrically. For this reason, the following description will focus on the cover mechanism 80 provided on housing member 22L, and the description of the cover mechanism 80 provided on housing member 22R will be omitted as appropriate. The cover mechanism 80 includes a cover filter 84 as a cover and a cover mounting portion 82 for detachably attaching the cover filter 84 to the housing 20 (rear housing portion 24).

[0036] (Regarding the cover mounting section 82) The cover mounting portion 82 is formed in a concave shape on the outer circumference of the left side of the rear housing portion 24, opening to the left and to one side perpendicular to it, and the air intake port 24A is exposed within the cover mounting portion 82. That is, the bottom wall of the cover mounting portion 82 is made up of the side wall of the housing member 22L, and the bottom surface of the cover mounting portion 82 is not covered by the rubber portion 25 so as to expose the air intake port 24A. In other words, the inner circumferential surface of the cover mounting portion 82 is made up of the rubber portion 25. The cover mounting portion 82 extends in the inclined direction and is formed in a roughly home plate shape that is convex to the other side perpendicular to it when viewed from the left side. Specifically, an inclined portion is formed at the corner of the cover mounting portion 82 on the other side perpendicular to it, and the inclined portion is inclined inward in the width direction (inclination direction) of the cover mounting portion 82 as it extends toward the other side perpendicular to it.

[0037] First mounting portions 82A are formed on the inner circumference at both ends in the width direction of the cover mounting portion 82. The first mounting portions 82A are formed in the shape of grooves that open inward in the width direction of the cover mounting portion 82 and are open to one side in the perpendicular direction. That is, the inside of the first mounting portion 82A and the inside of the cover mounting portion 82 are in communication, and one end of the first mounting portion 82A in the perpendicular direction is open. The left inner circumference surface of the first mounting portion 82A is made of the housing member 22L, and a hole 82B is formed in the bottom wall of the cover mounting portion 82 to open the first mounting portion 82A to the right side (towards the inside of the housing 20).

[0038] A second mounting portion 82C is formed on the inner circumference of the other side of the cover mounting portion 82 in the direction perpendicular to it, in the middle of the width direction of the cover mounting portion 82. The second mounting portion 82C is formed in the shape of a substantially rectangular hole with the width direction of the cover mounting portion 82 as its longitudinal direction, and is open to one side in the direction perpendicular to it. Specifically, the second mounting portion 82C is formed in the rubber portion 25, and a hole 82D is formed in the bottom wall of the cover mounting portion 82 to open the second mounting portion 82C to the right side (towards the inside of the housing 20).

[0039] An engaging rib 82E (see Figures 4 and 5) is formed as an engaging portion at the other end of the bottom surface of the cover mounting portion 82 in the direction perpendicular to it. The engaging rib 82E is made of a rubber portion 25. That is, the rubber portion 25 constitutes the bottom surface of the other end of the cover mounting portion 82 in the direction perpendicular to it, and the engaging rib 82E is formed as a rib that protrudes to the left of the bottom surface of the cover mounting portion 82 and extends in the width direction of the cover mounting portion 82, and is formed in a substantially trapezoidal shape when viewed in its longitudinal direction.

[0040] (Regarding cover filter 84) The cover filter 84 is formed in a substantially plate shape with the left-right direction being the thickness direction. The cover filter 84 is composed of a frame portion 86 that constitutes the outer periphery of the cover filter 84 and a mesh portion 88 provided inside the frame portion 86.

[0041] The frame portion 86 is made of resin and is formed in a substantially frame shape that extends in the direction of inclination. The shape of the frame portion 86 corresponds to the shape of the cover mounting portion 82 and is formed in a substantially home plate shape that protrudes toward the other side in the perpendicular direction when viewed from the left. Specifically, inclined portions 86A are formed at the corners of the frame portion 86 toward the other side in the perpendicular direction, and the inclined portions 86A are inclined in a direction that approaches each other as they move toward the other side in the perpendicular direction when viewed from the left. Projections 86B that protrude outward in the width direction are formed at both ends of the frame portion 86 in the width direction (both ends in the direction of inclination).

[0042] First mounting pieces 86C are provided at both ends of the frame portion 86 in the width direction. The first mounting pieces 86C are formed in a substantially rectangular plate shape with the left-right direction being the plate thickness direction, and extend from the protruding portion 86B to the other side in a perpendicular direction. The left surface of the first mounting piece 86C is positioned one step lower to the right of the left surface of the frame portion 86, and the right surface of the first mounting piece 86C is positioned flush with the right surface of the frame portion 86. The first mounting piece 86C is inserted into the first mounting portion 82A of the cover mounting portion 82 from one side in a perpendicular direction, thereby attaching the frame portion 86 to the cover mounting portion 82. A projection 86D is formed on the left surface of the first mounting piece 86C, and the projection 86D is formed in a substantially spherical shape that is convex to the left. When the first mounting piece 86C is inserted into the first mounting portion 82A, the projection 86D is in contact with the inner circumferential surface of the first mounting portion 82A (see Figure 5).

[0043] A second mounting piece 86E is provided on the other side of the frame portion 86 in the direction perpendicular to it, in the middle of the width direction. The second mounting piece 86E is formed in a substantially rectangular plate shape with the left-right direction as the plate thickness direction, and protrudes from the frame portion 86 to the other side in the direction perpendicular to it. The left side of the second mounting piece 86E is positioned one step lower to the right of the left side of the frame portion 86, and the right side of the second mounting piece 86E is positioned flush with the right side of the frame portion 86. The second mounting piece 86E is inserted into the second mounting portion 82C of the cover mounting portion 82 from one side in the direction perpendicular to it, and engages with the second mounting portion 82C in the left-right direction (see Figure 4). In other words, when the frame portion 86 (cover filter 84) is attached to the cover mounting portion 82, the frame portion 86 (cover filter 84) engages with the cover mounting portion 82 in the left-right direction, preventing the cover filter 84 from falling off the cover mounting portion 82 to the left (outside in the plate thickness direction).

[0044] Furthermore, one side of the frame portion 86 in the orthogonal direction is inclined to the right as it approaches the orthogonal direction when viewed from the direction of inclination, and is positioned flush with the outer circumferential surface of the rubber portion 25. Also, the left side of the frame portion 86 is positioned to be approximately flush with the outer circumferential surface of the rubber portion 25. In other words, the outer circumferential surface of the frame portion 66 of the cover filter 84 is positioned flush with the outer circumferential surface of the rubber portion 25, and the cover filter 84 is configured as a decorative element of the grinder 10.

[0045] On the right side of the frame portion 86 (the surface facing the bottom surface of the cover mounting portion 82 of the housing 20), an engaging groove 86F (see Figures 4 and 5) is formed at one end in the orthogonal direction as an engaging portion. The engaging groove 86F extends along the width direction of the frame portion 86 and is formed in a concave shape that opens outward in the width direction and to one side in the orthogonal direction. The engaging rib 82E of the cover mounting portion 82 is positioned inside the engaging groove 86F, and the engaging rib 82E and the inner circumferential surface of the engaging groove 86F are configured to engage in the orthogonal direction. That is, the frame portion 86 (cover filter 84) is configured to engage in the orthogonal direction when the frame portion 86 (cover filter 84) covers the engaging rib 82E from the left side. As a result, when the frame portion 86 (cover filter 84) attempts to move to one side in the orthogonal direction, the inner circumferential surface of the engaging groove 86F comes into contact with the engaging rib 82E, restricting the movement of the frame portion 86 (cover filter 84) to one side in the orthogonal direction. As a result, the mounting state of the cover filter 84 is maintained by the engaging rib 82E and the engaged groove 86F.

[0046] The mesh portion 88 is made of metal and is formed in the shape of a mesh plate with the left-right direction being the thickness direction. The mesh portion 88 is positioned inside the frame portion 86, and the outer periphery of the mesh portion 88 is embedded in the frame portion 86. When the cover filter 84 is attached to the cover mounting portion 82, the mesh portion 88 is positioned to the left of the air intake port 24A, and the mesh portion 88 covers the air intake port 24A from the outside in the left-right direction. This configuration prevents foreign matter from entering the inside of the housing 20 from the air intake port 24A, and the cover filter 84 prevents this.

[0047] (Effects and Benefits) Next, the operation and effects of the grinder 10 of this embodiment will be described.

[0048] When processing with the grinder 10 configured as described above, the operator grips the handle portion 23 of the housing 20 and operates the control dial 48 to set the rotation speed of the motor 30. Then, by sliding the switch lever 40 from the off position to the on position, the switch 41 is turned on, the motor 30 is driven, and the spindle 71 and grinding wheel 75 rotate. Thus, the grinder 10 can perform grinding and other processes on the workpiece.

[0049] Furthermore, when the motor 30 is driven, the fan 34 rotates together with the motor 30, generating an airflow that flows into the housing 20 from the intake port 24A. This airflow into the housing 20 cools the controller 50 and the motor 30.

[0050] Here, a cover filter 84 that covers the air intake port 24A is detachably attached to the outer circumference of the rear housing portion 24 of the housing 20. The outer circumference of the rear housing portion 24 is covered with a rubber portion 25 made of an elastic material, and the rubber portion 25 is provided with an engaging rib 82E. The frame portion 86 of the cover filter 84 engages with the engaging rib 82E, thereby maintaining the mounting state of the cover filter 84. In this way, the mounting state of the cover filter 84 can be maintained by the housing 20 including the rubber portion 25. That is, the cover filter 84 can be attached to the outer circumference of the housing 20 without using fixing parts such as screws to maintain the mounting state of the cover filter 84. Furthermore, unlike the grinder described in the background art, it is not necessary to remove the battery 44 from the housing 20 each time the cover filter 84 is attached or detached. Therefore, the installation work of the cover filter 84 can be simplified. Moreover, the engaging rib 82E is formed in the elastic rubber portion 25. This allows the cover filter 84 to be easily removed from the housing 20 by elastically deforming the engaging rib 82E when the cover filter 84 is removed. As a result, the workability when attaching and detaching the cover filter 84 can be improved.

[0051] Furthermore, the outer circumferential surface of the frame portion 66 of the cover filter 84 is positioned along the outer circumferential surface of the rubber portion 25. Therefore, the cover filter 84, which is configured as a design element, can be easily attached to the outer circumferential surface of the grinder 10.

[0052] Furthermore, the cover filter 84 is formed in a plate shape with the left-right direction as the thickness direction, and is attached to the cover mounting portion 82 of the housing 20 from one side in a direction perpendicular to the thickness direction. Specifically, the first mounting piece 86C of the cover filter 84 is inserted into the first mounting portion 82A of the cover mounting portion 82, and the second mounting piece 86E of the cover filter 84 is inserted into the second mounting portion 82C of the cover mounting portion 82, thereby attaching the cover filter 84 to the housing 20. The engaging rib 82E then engages with the inner circumferential surface of the engaging groove 86F of the cover filter 84 in a direction perpendicular to it, restricting the movement of the cover filter 84 to one side in the direction perpendicular to it. This allows the cover filter 84 to be attached to the housing 20 with a simple configuration, and the attached state of the cover filter 84 can be maintained.

[0053] Furthermore, the engaging rib 82E protrudes to the left from the bottom surface of the cover mounting portion 82, and the frame portion 86 of the cover filter 84 covers the engaging rib 82E from the left side. This makes the engaging rib 82E invisible from the left side. Therefore, the mounting state of the cover filter 84 can be maintained by the engaging rib 82E of the rubber portion 25 while suppressing a decrease in the design performance of the grinder 10.

[0054] Furthermore, the handle housing 22 of the housing 20 is composed of a rear housing portion 24 and a handle portion 23 positioned on the front side (one side in the perpendicular direction) of the rear housing portion 24, with the width dimension (left-right dimension) of the handle portion 23 being smaller than the width dimension (left-right dimension) of the rear housing portion 24. The cover filter 84 is attached to the left and right sides of the rear housing portion 24. This prevents the cover filter 84 from interfering with the handle portion 23 when attaching or detaching the cover filter 84. In other words, the handle portion 23 can be provided in the housing 20 without affecting the attachment or detachment of the cover filter 84. Therefore, the workability when attaching or detaching the cover filter 84 can be further improved. In addition, the rubber portion 25 covers the rear housing portion 24 and the handle portion 23. This allows the rubber portion 25, which improves the grip of the handle portion 23, to be used to maintain the mounting state of the cover filter 84.

[0055] Furthermore, the rear housing portion 24 is provided with a battery mounting portion 24B, which is located on the other side of the cover filter 84 in a direction perpendicular to it. This prevents the cover filter 84 from interfering with the battery 44 when attaching or detaching the cover filter 84. In other words, the battery 44 can be installed in the housing 20 without affecting the attachment or detachment of the cover filter 84. Therefore, the ease of attaching and detaching the cover filter 84 can be further improved.

[0056] Furthermore, the cover filter 84 is composed of a frame portion 86 and a mesh portion 88 positioned inside the frame portion 86, and slides in a perpendicular direction to attach and detach it from the cover mounting portion 82. This allows, for example, an operator to attach and detach the cover filter 84 to the cover mounting portion 82 by sliding it while hooking the frame portion 86 with their fingers. Therefore, the workability when attaching and detaching the cover filter 84 can be effectively improved.

[0057] In this embodiment, the cover mechanism 80 is applied to the grinder 10, and a portion of the outer periphery of the grinder 10 is covered by the cover filter 84 of the cover mechanism 80. However, the cover mechanism may also be applied to other work machines, and a portion of the outer periphery of the other work machine may be covered by the cover mechanism. Below, an example in which the cover mechanism 180 is applied to an impact wrench 100 as a work machine will be described with reference to Figures 7 and 8.

[0058] The impact wrench 100 has a housing 110 that forms the outer casing of the impact wrench 100. The housing 110 is made of resin, extends in the vertical direction, and is formed in a substantially I-shape when viewed from the left side. Specifically, the housing 110 is composed of an upper housing portion 111 that forms the upper part of the housing 110, a handle portion 112 that forms the vertical middle part of the housing 110, and a lower housing portion 113 that forms the lower part of the housing 110.

[0059] The upper housing 111 houses a motor 120 and an impact mechanism 122, which serve as the drive unit. The impact mechanism 122 has an anvil 123 to which the cutting tool is attached, and the anvil 123 protrudes forward from the upper housing 111. When the motor 120 is driven, the impact mechanism 122 is activated, and rotational impact force is applied to the anvil 123.

[0060] The handle portion 112 extends vertically, and a trigger 130 is provided at the upper end of the handle portion 112 so as to be pullable. When the trigger 130 is pulled, the motor 120 is driven. A battery mounting portion 113A is provided at the lower end of the lower housing portion 113. The battery mounting portion 113A is configured similarly to the battery mounting portion 24B of the grinder 10, and is formed in a concave shape that is open to the lower and front sides. The battery 44 is mounted in the battery mounting portion 113A from the front, and power is supplied to the motor 120.

[0061] A rubber portion 115 (see the gray-filled area in Figure 7) is integrally formed on the outer circumference of the housing 110 as a covering portion. The rubber portion 115 is made of an elastic material such as rubber or elastomer, similar to the rubber portion 25 of the grinder 10. The upper outer circumference of the lower housing portion 113 is covered by the rubber portion 115.

[0062] The cover mechanism 180 is provided on the left side of the lower housing portion 113. The cover mechanism 180 of the impact wrench 100 has a cover mounting portion 182 formed on the housing 110 and a cover plate 184 that serves as a cover.

[0063] The cover mounting portion 182 is formed in a concave shape that opens to the right, extends in the front-rear direction when viewed from the right, and is formed in a substantially parallelogram shape. The upper part of the cover mounting portion 182 is made up of a rubber portion 115, and the lower part of the cover mounting portion 182 is made up of a lower housing portion 113. On the inner circumferential surface of the front end of the cover mounting portion 182, a mounting hole 182A is formed at the upper end, and the mounting hole 182A is formed in the shape of a hole that opens to the rear. On the inner circumferential surface of the rear end of the upper part of the cover mounting portion 182, an engagement rib 182B is formed as an engagement portion. The engagement rib 182B extends along the outer circumferential edge of the cover mounting portion 182 and is formed in the shape of a rib that protrudes to the front. The engagement rib 182B is positioned spaced to the right of the bottom surface of the cover mounting portion 182. In addition, a projection 182C that protrudes to the left is formed in the middle part of the cover mounting portion 182 in the front-rear direction.

[0064] The cover plate 184 is formed in a plate shape with approximately left-right and thickness directions, and the outer shape of the cover plate 184 is formed in a substantially parallelogram shape corresponding to the cover mounting portion 182 when viewed from the left side. The cover plate 184 is configured as a decorative element for decorating the impact wrench 100. A mounting piece 184A is integrally formed at the upper end of the front end of the cover plate 184. In a plan view, the mounting piece 184A is bent in a substantially crank shape to the left and front, protruding forward from the cover plate 184. The mounting piece 184A is then inserted into the mounting hole 182A from the rear side, and the cover plate 184 is attached to the cover mounting portion 182.

[0065] When the cover plate 184 is attached to the cover mounting portion 182, the rear end of the cover plate 184 is inserted between the bottom surface of the cover mounting portion 182 and the engaging rib 182B, and the engaging rib 182B is positioned adjacent to the right side of the outer circumference of the cover plate 184. As a result, the engaging rib 182B and the outer circumference of the cover plate 184 engage in the left-right direction, maintaining the attached state of the cover plate 184. Therefore, in the cover mechanism 180 applied to the impact wrench 100, similar to the cover mechanism 80 of this embodiment, the cover plate 184 can be attached to the outer circumference of the housing 110 without using parts such as screws to maintain the attached state of the cover plate 184. Thus, the installation work of the cover plate 184 can be simplified. Furthermore, the engaging rib 182B is formed from an elastic rubber portion 115. As a result, when removing the cover plate 184, the engaging rib 182B is elastically deformed, allowing the cover plate 184 to be easily removed from the housing 20. As a result, the cover mechanism 180 applied to the impact wrench 100 also improves the ease of attaching and detaching the cover plate 184.

[0066] Furthermore, a hole 184B is formed approximately in the center of the cover plate 184, and a protrusion 86B is fitted into the hole 184B. [Explanation of symbols]

[0067] 10. Disc grinder (working tool) 20 Housing 23 Handle section (second housing section) 24 Rear housing section (first housing section) 24A Air intake 24B Battery compartment 25 Rubber part (covering part) 30 Motor (drive unit) 44 Batteries 75 Grinding wheels (cutting tools) 82E Engaging rib (engaging part) 84 Cover Filter (Cover) 86F Engaged groove (engaged part) 100 Impact wrench (work tool) 110 Housing 115 Rubber part (covering part) 120 Motor (drive unit) 182B Engaging rib (engaging part) 184 Cover Plate (Cover)

Claims

1. A drive unit that provides driving force to the cutting tool, A housing for the aforementioned drive unit, A covering portion is integrally formed with the housing, is made of an elastic material having elasticity, and covers the outer periphery of the housing, A cover that covers a part of the housing when attached to the housing, An engaging portion provided on the covering portion, which engages with the cover to maintain the state in which the cover is attached to the housing, Equipped with, The cover is a work machine that can be removed from the housing, whose outer periphery is covered by the covering portion, by disengaging it from the engaging portion, and can also be attached to the housing by engaging it with the engaging portion.

2. The cover is formed in a plate shape and is attached to the housing from one side in a direction perpendicular to the thickness direction of the cover. The work machine according to claim 1, wherein the engaging portion engages with the cover in a direction perpendicular to it, thereby restricting the movement of the cover to one side in that direction perpendicular to it.

3. The work machine according to claim 2, wherein the cover has an engaged portion formed thereon that is configured to be engaged with the engaging portion in the orthogonal direction.

4. The outer periphery of the housing has a concave cover mounting portion for attaching the cover, The engaging portion protrudes outward from the bottom surface of the cover mounting portion in the thickness direction of the cover, The work machine according to claim 3, wherein the cover covers the engaging portion from the outside in the plate thickness direction.

5. The aforementioned housing is The first housing portion to which the cover is attached, A second housing portion is positioned on one side of the first housing portion in the orthogonal direction and is configured as a handle portion, It consists of, The work machine according to claim 4, wherein the width dimension of the second housing portion is set to be smaller than the width dimension of the first housing portion, and the covering portion covers the first housing portion and the second housing portion.

6. The first housing portion is provided with a battery mounting portion for mounting a battery that supplies power to the drive unit, The work machine according to claim 5, wherein the battery mounting portion is located on the other side of the cover in the direction perpendicular to the aforementioned direction.

7. The housing has an air intake port formed therein, The work machine according to any one of claims 1 to 6, wherein the cover is a filter that covers the air intake.

8. The work machine according to any one of claims 1 to 6, wherein the cover is a decorative element for decorating the housing.

9. A drive unit that provides driving force to the tip tool, A housing for the aforementioned drive unit, A cover is attached to the outer circumference of the housing and covers a part of the housing, A covering portion is integrally formed with the housing, is made of an elastic material having elasticity, and covers the outer periphery of the housing, An engaging portion is provided on the covering portion and engages with the cover to maintain the mounting state of the cover, Equipped with, The housing has an air intake port formed therein, The cover is a filter that covers the air intake port of the work machine.

10. The work machine according to claim 1 or claim 9, wherein the engagement between the cover and the engagement portion can be released by elastically deforming the engagement portion.

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