Work machine

Abstract

To improve workability.SOLUTION: In a grinder 10, a return spring 74 energizing a slide bar 70 to an initial position is located at a position overlapping a motor switch 12 in a back and forth direction. Thus, when compared with a configuration in which in the back and forth direction, the motor switch 12 and the return spring 74 as a whole are displaced for arrangement, length in the back and forth direction of the slide bar 70 in a handle housing 30 can be shortened. That is, sliding length of a housing 20 at the back of the slide bar 70 can be shortened. This, for example, can suppress malfunction of the slide bar 70 by entering of chips that are generated during polishing between the back part of the slide bar 70 and the housing 20. Thus, it is possible to improve workability of the grinder 10 when the switch lever 72 is operated.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] In the grinder (working machine) described in Patent Document 1 below, a switch for driving a motor is provided inside a housing, and an operating part is provided on the side of the housing so as to be slidable in the front-rear direction. A slide bar is also provided inside the housing, and the slide bar slides inside the housing in conjunction with the sliding of the operating part to switch the switch between an on state and an off state.

[0003] The slide bar extends in the front-rear direction, with a front end of the slide bar engaging with the operating portion and a rear end of the slide bar engaging with the switch. Furthermore, a biasing member (not shown) is provided on the housing, and the biasing force of the biasing member holds the slide bar in its initial state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-171680 A Summary of the Invention [Problem to be solved by the invention]

[0005] Usually, in the slide bar, the part that engages with the biasing member and the part that engages with the switch are arranged offset from each other in the front-rear direction. This makes the length of the slide bar relatively long in the front-rear direction. This may increase the possibility of malfunction of the slide bar, for example, due to chips that have entered the housing entering between the slide bar and the housing. In that case, the operability of the operation part may decrease.

[0006] SUMMARY OF THE PRESENT EMBODIMENT In consideration of the above, an object of the present invention is to provide a work machine capable of improving workability. [Means for solving the problem]

[0007] One or more embodiments of the present invention are a work machine comprising: a motor having a rotating shaft whose axial direction is in the fore-and-aft direction; a switch configured to be switchable between an on state that drives the motor and an off state that stops the motor; a housing that accommodates the motor and the switch; a slide bar that extends in the fore-and-aft direction and is provided inside the housing so as to be slidable in the fore-and-aft direction, and that slides from an initial position to a forward operating position when operated to switch the switch from an off state to an on state; and a biasing member that is provided inside the housing and biases the slide bar rearward, wherein at least a part of the biasing member is located in the same position as the switch in the fore-and-aft direction.

[0008] One or more embodiments of the present invention are a work machine including: a switch lever operably provided on the housing, connected to the slide bar, and for inputting an operating force to the slide bar; a lever connecting portion connected to the switch lever is provided at a front end of the slide bar; and a locking portion to which the biasing member is locked and a switch pressing portion for pressing the switch are provided at a rear end of the slide bar, and the locking portion and the switch pressing portion are arranged side by side in the left-right direction.

[0009] One or more embodiments of the present invention are a work machine in which the switch is disposed above the switch pressing portion.

[0010] In one or more embodiments of the present invention, the housing is a work machine comprising: a motor housing having a motor accommodating portion that accommodates the motor, and a switch holding portion that is arranged rearward of the motor accommodating portion and holds the switch; and a handle housing that accommodates the switch holding portion, and the biasing member is engaged with the switch holding portion.

[0011] One or more embodiments of the present invention are a work machine in which a rear end of the slide bar is supported from one left-right side by the handle housing and is supported from the other left-right side by the switch holding portion.

[0012] One or more embodiments of the present invention are directed to a work machine in which the rear end portion of the slide bar is supported from both upper and lower sides by the switch holding portion.

[0013] One or more embodiments of the present invention are a work machine in which the switch holding portion has an accommodating recess that accommodates the switch pressing portion and the locking portion, the accommodating recess is formed in a concave shape that is open to one left-right side, and the opening of the accommodating recess is covered from one left-right side by the slide bar.

[0014] One or more embodiments of the present invention are a work machine in which a pair of support ribs are formed on the inner surface of one of the left-right sides of the handle housing, protruding toward the other left-right side and supporting the slide bar from the outside in the vertical direction, and the support ribs are arranged adjacent to one of the left-right sides of the switch holding portion and are arranged so as to sandwich the opening of the accommodating recess from the outside in the vertical direction when viewed from the left-right direction.

[0015] In one or more embodiments of the present invention, the urging member is housed in the housing recess.

[0016] One or more embodiments of the present invention are directed to a work machine in which the urging member is disposed at a position overlapping a bearing that supports the rotating shaft when viewed from the front-rear direction.

[0017] One or more embodiments of the present invention are directed to a work machine in which a portion of the switch pressing portion that comes into contact with the switch is positioned forward of a position of the engaging portion that supports the biasing member. Effect of the Invention

[0018] According to one or more embodiments of the present invention, workability can be improved. [Brief description of the drawings]

[0019] [Figure 1] 1 is a plan view showing a disk grinder according to an embodiment of the present invention, viewed from above. [Diagram 2] FIG. 2 is a side view of the disc grinder shown in FIG. 1 as seen from the left side. [Diagram 3] 2 is a cross-sectional view showing the inside of the disc grinder shown in FIG. 1 as viewed from the right side. [Figure 4] 4A is a perspective view showing a switch holding portion in the motor housing shown in FIG. 3 as viewed from diagonally rear left, and FIG. 4B is a perspective view of the switch holding portion of FIG. [Diagram 5] 5 is a cross-sectional view (cross-sectional view taken along line 5-5 in FIG. 2) seen from above, showing a state in which the switch lever shown in FIG. 2 is connected to a slide bar. FIG. [Figure 6] 6 is a cross-sectional view (cross-sectional view taken along line 6-6 in FIG. 5) seen from the right side, showing a state in which a switch pressing portion of the slide bar shown in FIG. 5 is accommodated in a switch holding portion. [Figure 7] 7 is a cross-sectional view (cross-sectional view taken along line 7-7 in FIG. 6) seen from the rear side, showing a state in which a switch pressing portion and a switch are housed in a switch holding portion in the slide bar shown in FIG. 6; [Figure 8] 6 is a cross-sectional view showing a state in which the slide bar shown in FIG. 5 has been slid to an operating position. [Figure 9] 6 is a perspective view showing the positional relationship between the slide bar and the switch shown in FIG. 5, as viewed obliquely from the left rear. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, a disc grinder 10 (hereinafter, simply referred to as grinder 10) as a work machine according to this embodiment will be described with reference to the drawings. Note that arrows UP, FR, and LH, which are appropriately shown in the drawings, respectively indicate the upper side, front side, and left side of the grinder 10. In the following description, when the up-down, front-back, and left-right directions are used, they refer to the up-down, front-back, and left-right directions of the grinder 10 unless otherwise specified.

[0021] The grinder 10 is configured as an electric tool for performing grinding and the like on a workpiece. As shown in Figs. 1 to 3, the grinder 10 includes a housing 20, a motor 50, and a transmission mechanism 60. Inside the housing 20, a slide bar 70 for transmitting an operating force by an operator to the motor switch 12, and a controller 80 are provided. Each component of the grinder 10 will be described below.

[0022] (About Housing 20) The housing 20 constitutes the outer shell of the grinder 10. The housing 20 is formed in a generally hollow columnar shape extending in the front-rear direction as a whole. The housing 20 includes a motor housing 21 that constitutes the middle part of the housing 20 in the front-rear direction, a handle housing 30 that constitutes the rear end part of the housing 20, and a gear housing 40 that constitutes the front end part of the housing 20.

[0023] (Regarding motor housing 21) The motor housing 21 is composed of a single indivisible member. The motor housing 21 has a motor accommodating portion 22 (see FIG. 3) that constitutes the front portion of the motor housing 21 and a switch holding portion 24 that constitutes the rear portion of the motor housing 21, and the switch holding portion 24 is disposed inside a handle housing 30 that will be described later.

[0024] The motor housing 22 is formed in a substantially bottomed cylindrical shape that is open to the front side. A fan housing 22A that protrudes radially outward is formed at the front end of the motor housing 22, and the fan housing 22A is formed in a substantially rectangular shape when viewed from the front. A switch lever 72 is provided at the left side of the motor housing 22. The switch lever 72 is connected to the motor housing 22 so as to be slidable in the front-rear direction. Specifically, the switch lever 72 is configured to be slidable between an OFF position (see FIGS. 1, 2, and 5) and an ON position (see FIG. 8) that is slid forward from the OFF position. The switch lever 72 is connected to a slide bar 70, which will be described later. When the switch lever 72 slides from the OFF position to the ON position, the slide bar 70 switches a motor switch 12, which will be described later, from an OFF state to an ON state, and the motor 50, which will be described later, is driven.

[0025] As shown in Figs. 3 and 4, a bearing holder 22B is formed in the approximate center of the rear wall of the motor housing section 22, and the bearing holder 22B is formed in an approximately bottomed cylindrical shape that is open to the front side. A plurality of holes are formed in the rear wall of the motor housing section 22 on the outer side in the left-right direction of the bearing holder 22B. The hole on the left side of the bearing holder 22B is configured as a lever insertion hole 22C (see Fig. 4(A)), and the hole on the right side of the bearing holder 22B is configured as a wiring insertion hole 22D (see Fig. 4(B)). The holes other than the lever insertion hole 22C and the wiring insertion hole 22D are configured as a communication hole 22E that communicates between the handle housing 30 described later and the motor housing section 22.

[0026] The switch holding portion 24 is formed in a substantially rectangular block shape with the thickness direction being the left-right direction and the longitudinal direction being the front-rear direction, and protrudes rearward from the substantially central portion of the rear wall of the motor housing portion 22. A hollowed-out portion 24A is formed in the upper portion of the rear end portion of the switch holding portion 24, which is one step lower toward the front side. A plurality of (three in this embodiment) fixing holes 24B for fixing a handle housing 30, which will be described later, are formed penetrating the switch holding portion 24 in the left-right direction. Two fixing holes 24B are arranged in a line in the vertical direction at the front end portion of the switch holding portion 24, and the other fixing hole 24B is arranged at the rear end portion of the switch holding portion 24 below the hollowed-out portion 24A.

[0027] A holding recess 24C that is open to the right side is formed in the middle of the upper part of the switch holding part 24 in the front-rear direction, and the upper part of the holding recess 24C penetrates in the left-right direction. A motor switch 12 (see FIG. 6) is housed in the holding recess 24C as a switch, and a switch main body 12A of the motor switch 12 is sandwiched from the outside in the left-right direction by the switch holding part 24 and a handle housing 30 described later and held by the switch holding part 24. The motor switch 12 has a plunger 12B that protrudes downward from the switch main body 12A. The motor switch 12 is electrically connected to a controller 80 described later.

[0028] A guide recess 24D is formed in the lower part of the switch holding part 24 in the front-rear direction intermediate part below the holding recess 24C as an accommodation recess for accommodating a rear end 70D of the slide bar 70 described later. The guide recess 24D is formed in a concave shape that opens to the left side, and is formed in a substantially rectangular shape with the front-rear direction as viewed from the left side. An insertion part 24E is formed in a wall part that vertically divides the holding recess 24C and the guide recess 24D in the switch holding part 24, and the holding recess 24C and the guide recess 24D are communicated by the insertion part 24E. The plunger 12B of the motor switch 12 is inserted into the insertion part 24E, and the tip part of the plunger 12B is disposed in the guide recess 24D (see FIG. 6). A support protrusion 24F protruding rearward is formed on the front wall of the guide recess 24D.

[0029] A wiring groove 24G that is open to the right is formed on the switch holding portion 24 on the right side of the guide recess 24D. The wiring groove 24G extends in the front-rear direction, and the front end of the wiring groove 24G communicates with the wiring insertion hole 22D. The rear end of the wiring groove 24G is bent upward and opens toward the hollowed portion 24A. In addition, the front-rear direction intermediate portion of the wiring groove 24G communicates with the guide recess 24D and opens upward.

[0030] (Regarding the handle housing 30) As shown in Figs. 1 to 3, the handle housing 30 is configured by housing members 30L, 30R as a split housing divided in two in the left-right direction. The housing members 30L, 30R are provided with fixing bosses (not shown) that protrude inward in the left-right direction. The fixing bosses sandwich a portion of the switch holding portion 24 corresponding to the fixing hole 24B, and the housing members 30L, 30R are fixed to the switch holding portion 24 by fixing screws that pass through the fixing bosses and the fixing holes 24B. That is, the housing members 30L, 30R are fastened and fixed to each other in a state in which the switch holding portion 24 is sandwiched from the outside in the left-right direction.

[0031] The handle housing 30 includes a handle portion 32 serving as a gripping portion that constitutes the front portion of the handle housing 30, and a controller accommodating portion 34 that constitutes the rear portion of the handle housing 30.

[0032] The handle portion 32 is formed in a substantially cylindrical shape extending in the front-rear direction, and is disposed adjacent to the rear side of the motor accommodating portion 22. The diameter of the handle portion 32 is set to be smaller than the diameter of the motor accommodating portion 22. Specifically, when viewed from the left-right direction, the upper end of the handle portion 32 and the upper end of the motor accommodating portion 22 (excluding the fan accommodating portion 22A) are aligned, and the lower end of the handle portion 32 is disposed offset upward from the lower end of the motor accommodating portion 22. In addition, in a plan view, the left and right side surfaces of the handle portion 32 are disposed laterally inward from the left and right side surfaces of the motor accommodating portion 22. Note that an inclined portion 20A is formed on the outer peripheral surface of the boundary between the motor accommodating portion 22 and the handle portion 32 in the housing 20, and the inclined portion 20A smoothly connects the outer peripheral surfaces of the motor accommodating portion 22 and the handle portion 32.

[0033] Both left and right sides of the controller accommodating section 34 protrude outward in the left and right direction more than the handle section 32. The lower end of the controller accommodating section 34 protrudes downward more than the handle section 32 and the motor accommodating section 22. The upper end of the controller accommodating section 34 protrudes slightly upward more than the handle section 32 and is located lower than the upper end of the fan accommodating section 22A and the gear housing 40 described later. A plurality of air intakes 34A (see FIG. 2) are formed penetrating the left and right side walls of the controller accommodating section 34. The air intakes 34A are formed in the shape of elongated holes with the vertical direction as the longitudinal direction. The air intakes 34A are covered by a filter (not shown) provided in the controller accommodating section 34 to allow ventilation.

[0034] 3, upper and lower fixed bosses 34B, 34C are provided at the rear end of the side wall of the controller accommodating portion 34 as bosses extending in the left-right direction, and the rear ends of the housing members 30L, 30R are fastened to each other by fixing screws inserted into the upper and lower fixed bosses 34B, 34C. The upper fixed boss 34B is located at the upper end portion of the controller accommodating portion 34, and the lower fixed boss 34C is located at the lower end of the controller accommodating portion 34.

[0035] A battery mounting section 34D for mounting the battery 14 is provided at the rear end of the controller accommodating section 34. The battery mounting section 34D is formed in a concave shape that is open to the rear and upper sides. A terminal holder 36 is provided in the battery mounting section 34D between the upper fixed boss 34B and the lower fixed boss 34C, and the terminal holder 36 is sandwiched from the outside in the left-right direction by the housing members 30L and 30R and assembled to the controller accommodating section 34. A terminal 36A is held in the terminal holder 36, and the battery 14 mounted from above in the battery mounting section 34D is connected to the terminal 36A.

[0036] (Regarding gear housing 40) As shown in Figs. 1 to 3, the gear housing 40 is formed in a concave shape that is open downward, and the upper wall of the gear housing 40 is inclined upward toward the rear side when viewed from the left-right direction. The rear end of the gear housing 40 is formed in a substantially rectangular tubular shape that protrudes upward from the upper wall of the gear housing 40 and is open toward the rear side. The gear housing 40 is fastened and fixed to the motor housing 21 with the fan accommodating section 22A of the motor housing 21 butting against the rear end of the gear housing 40 in the front-rear direction. A plurality of exhaust ports 40A are formed through the portion protruding upward at the rear end of the gear housing 40, and the exhaust ports 40A are formed in the shape of an elongated hole with the left-right direction as the longitudinal direction. A packing land 42 is provided on the lower side of the gear housing 40. The packing land 42 is formed in a stepped cylindrical shape with the vertical direction as the axial direction, and is fixed to the gear housing 40.

[0037] (Regarding motor 50) 3, the motor 50 is configured as a brushless motor, and is accommodated in the motor accommodating portion 22 of the motor housing 21. The motor 50 includes a rotating shaft 51, a rotor 52, and a stator 53.

[0038] The rotating shaft 51 is disposed with the front-rear direction as its axial direction. The rear end of the rotating shaft 51 is rotatably supported by a first motor bearing 55 held by the bearing holder 22B. The front end of the rotating shaft 51 is disposed in the gear housing 40, and a front end portion of the rotating shaft 51 is rotatably supported by a second motor bearing 56 held by the gear housing 40. A pinion gear 57 is fixed to the front end of the rotating shaft 51. The stator 53 is formed in a substantially cylindrical shape with the front-rear direction as its axial direction, and is supported by the motor accommodating section 22 on the radial outside of the rotor 52.

[0039] A fan 58 is provided on the front end portion of the rotating shaft 51 at the rear side of the second motor bearing 56 so as to be integrally rotatable therewith, and the fan 58 is configured as a centrifugal fan. A fan guide 59 is provided on the radial outside of the fan 58, and the fan guide 59 is accommodated in the fan accommodating portion 22A of the motor housing 21. The fan 58 is configured to generate an air flow from the rear side to the front side. That is, an air flow is generated that flows into the housing 20 from the intake port 34A, and the air flow passes through the lever insertion hole 22C, the wiring insertion hole 22D, and the communication hole 22E of the motor housing 21 and flows out from the exhaust port 40A of the gear housing 40. Therefore, the controller 80 and the motor 50 described later are cooled by the air flow.

[0040] (Regarding the transmission mechanism 60) The transmission mechanism 60 has a spindle 61. The spindle 61 is formed in a generally cylindrical shape with the vertical direction as the axial direction, and is disposed within the gear housing 40. An upper end portion of the spindle 61 is rotatably supported by a spindle bearing 62 fixed to the gear housing 40, and an intermediate portion of the spindle 61 in the vertical direction is rotatably supported by a spindle bearing 63 fixed to the packing gland 42. A bevel gear 64 is provided at the upper end portion of the spindle 61 so as to be rotatable together with the spindle 61, and the bevel gear 64 is engaged with the pinion gear 57 of the motor 50.

[0041] A grindstone 65 is attached to the lower end of the spindle 61, and is formed in a substantially circular plate shape with the thickness direction being in the up-down direction. As a result, the grindstone 65 rotates together with the spindle 61 by the driving force of the motor 50, thereby performing grinding and other processes on the workpiece. In addition, a wheel guard 66 is detachably fixed to the lower end of the packing gland 42, and the wheel guard 66 covers the rear part of the grindstone 65 from above and from the rear.

[0042] (About Slide Bar 70) As shown in Figs. 5 to 9, the slide bar 70 is connected to the switch lever 72 and is configured as a member that operates in conjunction with the sliding of the switch lever 72 to the on position to switch the motor switch 12 from an off state to an on state. The slide bar 70 is formed in a substantially long plate shape that extends in the front-rear direction and has a plate thickness direction in the left-right direction. The slide bar 70 is accommodated in the left end inside the motor accommodating section 22 of the motor housing 21 and the handle section 32 of the handle housing 30, and is disposed close to the inner peripheral surfaces of the motor accommodating section 22 and the handle section 32. In addition, a front-rear intermediate portion of the slide bar 70 is inserted through the lever insertion hole 22C of the motor housing 21 so as to be slidable in the front-rear direction.

[0043] An extension part 70A extending in the front-rear direction is formed in the front-rear direction intermediate part of the slide bar 70, and an inclined part inclined to the right as it goes toward the rear side in a plan view is formed in the front-rear direction intermediate part of the extension part 70A. This inclined part offsets the rear part of the slide bar 70 (extension part 70A) to the right (the center side in the left-right direction of the grinder 10) from the front part of the slide bar 70. A lever connection part 70B for connecting the switch lever 72 is formed in the front end part of the slide bar 70. A connection hole 70C is formed through the lever connection part 70B, and the connection hole 70C is formed in a substantially horizontal T-shape when viewed from the left side. A lever boss 72A protruding from the switch lever 72 is inserted into the front end part of the connection hole 70C, and the switch lever 72 and the slide bar 70 are connected in an engaged state. As a result, in conjunction with the sliding of the switch lever 72 from the off position to the on position, the slide bar 70 is slid forward from the initial position (the position shown in FIG. 5) to an operating position (the position shown in FIG. 8).

[0044] A rear end 70D is provided at the rear end of the slide bar 70. The rear end 70D is formed in a substantially rectangular parallelepiped block shape with the thickness direction being the up-down direction, and protrudes to the right from the slide bar 70 (the rear end of the extension portion 70A). Although details will be described later, the left part of the rear end 70D protruding to the right is a part that engages (holds) the return spring 74, and the right part is a part that presses the motor switch 12. The rear end 70D is accommodated in the guide recess 24D of the switch holding portion 24 so as to be movable in the front-rear direction. Specifically, the rear end 70D is located within the rear end of the guide recess 24D, and when the slide bar 70 slides from the initial position to the operating position, the rear end 70D moves forward within the guide recess 24D.

[0045] When the rear end 70D is housed in the guide recess 24D, the rear end 70D is supported from the outside in the up-down direction by the upper and lower surfaces of the guide recess 24D. Also, when the rear end 70D is housed in the guide recess 24D, the rear end 70D is supported from the right side by the guide recess 24D and is supported from the left side by the handle portion 32. That is, when the slide bar 70 slides, the rear end 70D of the slide bar 70 is guided by the guide recess 24D and the handle portion 32.

[0046] A spring accommodating portion 70E (spring holding portion) is formed at the left part of the rear end portion 70D as a locking portion (holding portion). The spring accommodating portion 70E is formed in a concave shape that is open to the upper side and the front side. A return spring 74 is accommodated (held) in the spring accommodating portion 70E as a biasing member. The return spring 74 is configured as a compression coil spring, and the front end of the return spring 74 is engaged with the front wall of the guide recess 24D, and the rear end of the return spring 74 is disposed in the spring accommodating portion 70E and engaged with the rear wall of the spring accommodating portion 70E. As a result, the slide bar 70 is held in the initial position by the return spring 74 that is disposed at the same position as the motor switch 12 in the front-rear direction (a position that overlaps with the motor switch 12 when viewed in the left-right direction). The support protrusion 24F is inserted into the front end of the return spring 74, and the front end of the return spring 74 is supported by the support protrusion 24F. A support protrusion 70F protruding forward is formed on the rear wall of the spring accommodating portion 70E, and the support protrusion 70F is inserted into the rear end portion of the return spring 74, thereby supporting the rear end portion of the return spring 74. The rear end portion 70D of the slide bar 70 (more specifically, the left wall of the spring accommodating portion 70E at the rear end portion 70D) covers the left opening of the guide recess 24D at a predetermined distance from the left side.

[0047] The right part of the rear end 70D is configured as a switch pressing part 70G. That is, the switch pressing part 70G configures the right wall of the spring accommodating part 70E. The switch pressing part 70G is located below the plunger 12B of the motor switch 12. An inclined surface 70H is formed at the front end of the upper surface of the switch pressing part 70G, and the inclined surface 70H is inclined downward as it approaches the front side when viewed from the left-right direction. In the initial position of the slide bar 70, the plunger 12B is located above the inclined surface 70H (see the switch pressing part 70G shown by the solid line in FIG. 6). Then, when the slide bar 70 slides forward from the initial position, the inclined surface 70H and the upper surface of the switch pressing part 70G press the plunger 12B upward, and the motor switch 12 is switched to the on state (see the switch pressing part 70G shown by the two-dot chain line in FIG. 6). As shown in the figure, the portion of the slide bar 70 that presses (contacts) the motor switch 12 is located forward of the portion that supports the return spring 74.

[0048] Also, when viewed from the front-rear direction, at least a part of each of the rear end 70D and the return spring 74 is arranged at a position overlapping the first motor bearing 55 (see FIG. 5). Furthermore, a pair of upper and lower support ribs 32A (see FIG. 7) that support the rear end of the slide bar 70 from the outside in the up-down direction is formed on the inner peripheral surface of the handle portion 32 of the handle housing 30. The support rib 32A is formed in a rib shape that has the thickness direction in the up-down direction and extends in the front-rear direction, and is located on the outside in the up-down direction of the slide bar 70. Also, the right end of the support rib 32A is arranged adjacent to the left side of the switch holding portion 24, and the support rib 32A is arranged so as to sandwich the opening of the guide recess 24D from the outside in the up-down direction when viewed from the left-right direction. As a result, the support rib 32A closes the opening of the guide recess 24D from the outside in the up-down direction.

[0049] (Regarding the controller 80) 3, the controller 80 is formed in a generally rectangular, flat shape with its thickness extending in the front-to-rear direction as a whole. The controller 80 is accommodated in the controller accommodating portion 34 in a state in which it is tilted forward as it approaches the upper side, and is held in the handle housing 30. That is, the upper end portion of the controller 80 is disposed forward of the lower end portion of the controller 80, and the controller 80 is disposed in the controller accommodating portion 34 in a forward-leaning position.

[0050] The controller 80 includes a controller board 81 as a board and a controller case 82 as a case for holding the controller board 81. The controller case 82 is formed in a rectangular box shape with a relatively shallow bottom that opens forward, and is sandwiched between the housing members 30L and 30R from the outside in the left and right direction in a forward-leaning posture. The upper end of the controller case 82 is disposed in front of the upper fixed boss 34B and spaced apart, and the space between the upper end of the controller case 82 and the upper fixed boss 34B in the controller accommodating section 34 is the upper space 34E. The lower end of the controller case 82 is disposed within the lower end of the controller accommodating section 34 and is disposed diagonally above the lower fixed boss 34C. The space between the lower end of the controller case 82 and the front wall of the controller accommodating section 34 in the controller accommodating section 34 is the lower space 34F. The lower end portion of the controller case 82 is adjacent to the front side of the terminal holder 36, and is disposed so that the lower end of the controller case 82 overlaps with the terminal holder 36 in a plan view. In addition, the upper end of the controller case 82 is disposed at a distance from the rear side of the hollowed-out portion 24A of the switch holding portion 24. As a result, the hollowed-out portion 24A makes the front space at the upper end of the controller 80 wider toward the front side than the front space at the middle portion of the controller 80 in the front-rear direction.

[0051] The controller board 81 is formed in a substantially rectangular plate shape with the thickness direction of the controller case 82 as the plate thickness direction, and is disposed in the controller case 82 and held by the controller case 82. The motor 50 described above is electrically connected to the controller board 81. Specifically, three motor wires 83 extending from the coil of the motor 50 are inserted through the wire insertion hole 22D of the motor housing 21, routed in the wire groove portion 24G of the switch holding portion 24, and disposed in the hollow portion 24A of the switch holding portion 24. In addition, three first wires 84 extending forward from the controller board 81 are connected to the motor wires 83 by connection terminals 85A, 85B, and 85C as terminal components. Specifically, the connection terminal 85A is disposed in the hollow portion 24A and connects the motor wires 83 and the first wires 84. In addition, the connection terminal 85B is disposed on the rear side of the connection terminal 85A and connects the motor wires 83 and the first wires 84. Furthermore, a connection terminal 85C is disposed on the rear side of the lower end portion of the switch holding portion 24, and connects the motor wiring 83 and the first wiring 84. The motor wiring 83 connected to the connection terminal 85C is routed from the hollowed-out portion 24A to the rear side of the switch holding portion 24. The motor wiring 83 and the first wiring 84 are configured as wiring for supplying power to the motor 50.

[0052] Furthermore, a capacitor 86 is provided as an electronic component on the front surface of the controller board 81. The capacitor 86 protrudes forward from the opening of the controller case 82, and the front end of the capacitor 86 is located within the rear end of the handle portion 32. Specifically, the capacitor 86 is disposed below the hollowed-out portion 24A, and the front end of the capacitor 86 is located between the connection terminals 85B and 85C. In other words, the connection terminals 85A, 85B, and 85C are located on both sides of the capacitor 86 in the up-down direction.

[0053] Further, a second wiring 88 extending from the lower part of the controller board 81 via a connector 87 is routed in the lower space 34F, and is routed in front of the capacitor 86 and in the wiring groove 24G of the switch holding part 24, and passes through the wiring insertion hole 22D. The second wiring 88 is connected to the sensor board 54 of the motor 50 and configured as a signal line. Thus, the lower space 34F of the controller accommodating part 34 is configured as a space for arranging the connector 87 and for drawing the second wiring 88, which is a signal line, toward the handle part 32 side.

[0054] The terminal 36A for the battery 14 described above is electrically connected to the controller board 81. Specifically, the third wiring 89 extending upward from the terminal 36A is routed in the upper space 34E, routed so as to surround the upper part of the controller 80, and connected to the upper part of the controller board 81. For this reason, the upper space 34E between the upper fixed boss 34B and the upper end part of the controller 80 is configured as a space for routing the third wiring 89 for connecting the controller 80 and the battery 14.

[0055] An operation panel 90 for changing the rotation speed of the motor 50 is provided on the upper side of the controller 80. The operation panel 90 is formed in a substantially rectangular box shape with the left-right direction as the longitudinal direction, and a board (not shown) is provided inside the operation panel 90. A tactile switch and an LED (not shown) are mounted on the board. The upper surface of the operation panel 90 is formed by a panel sheet 91, and the panel sheet 91 is exposed from the upper end of the controller housing 34 to be operable upward. The tactile switch and the LED are electrically connected to the controller 80. Specifically, a fourth wiring 92 extending from the lower end of the controller 80 extends in the vertical direction on the front side of the controller 80, and the lower end of the fourth wiring 92 is connected to the lower end of the controller board 81. The third wiring 89 described above is also arranged between the operation panel 90 and the controller 80.

[0056] The tilt angle of the controller 80 in the vertical direction is set so that the controller 80 is disposed within the front-to-back width of the operation panel 90. That is, when viewed from above, the controller 80 in a forward-leaning position overlaps with the operation panel 90, and is accommodated in the controller accommodating portion 34 so as not to protrude beyond the operation panel 90 on either side in the front-to-back direction.

[0057] (Action and effect) Next, the operation and effects of the grinder 10 of this embodiment will be described.

[0058] When processing with the grinder 10 configured as described above, an operator holds the handle portion 32 of the housing 20 and presses the operation panel 90 to set the rotation speed of the motor 50. Then, by sliding the switch lever 72 from the OFF position to the ON position, the switch pressing portion 70G of the slide bar 70 turns on the motor switch 12, and an ON signal is output from the motor switch 12 to the controller 80. This drives the motor 50 and rotates the spindle 61 and the grindstone 65. Thus, the grinder 10 can perform grinding and other processes on the workpiece.

[0059] Here, in the housing 20 of the grinder 10, the handle portion 32 is provided on the rear side of the motor housing portion 22, the controller housing portion 34 is provided on the rear side of the handle portion 32, and the controller 80 is housed in the controller housing portion 34. Also, an operation panel 90 for setting the rotation speed of the motor 50 is located radially outward (upper side) of the rotation shaft 51 of the motor 50 with respect to the controller 80. As a result, compared to a configuration in which the operation panel 90 is disposed on the front side with respect to the controller 80, it is possible to set the length of the handle portion 32 in the front-rear direction that the operator grips to be longer while suppressing an increase in the size of the grinder 10 in the front-rear direction. Therefore, it is possible to improve the operability for the operator.

[0060] The controller 80 is formed in a rectangular flat shape with the thickness in the front-rear direction, and is disposed so as to incline forward as it approaches the upper side when viewed from the left-right direction. That is, the upper end of the controller 80 is located forward of the lower end of the controller 80. This allows the controller housing 34, which protrudes downward from the handle portion 32, to be disposed as far rearward as possible with respect to the handle portion 32. That is, as described above, it is possible to set the length of the handle portion 32 held by the operator in the front-rear direction to be long while suppressing the increase in the size of the grinder 10 in the front-rear direction. Therefore, it is possible to improve the operability for the operator.

[0061] In addition, by storing the controller 80 in the controller accommodating portion 34 in a forward tilted position, a lower space 34F formed in front of the controller 80 in the controller accommodating portion 34 and an upper space 34E formed behind the controller 80 can be effectively secured. As a result, the controller accommodating portion 34 can be prevented from becoming large in size in the front-rear direction, compared to a configuration in which the controller 80 is arranged in the up-down direction to secure the lower space 34F and the upper space 34E, for example. In this respect, the length of the handle portion 32 held by the operator in the front-rear direction can be set to be long while suppressing an increase in the size of the grinder 10 in the front-rear direction. Therefore, the operability for the operator can be improved.

[0062] Furthermore, in the controller 80, the capacitor 86 protrudes forward from the upper part of the controller board 81, and the front end of the capacitor 86 is located within the rear end of the handle portion 32. Therefore, even when the controller 80 is placed in a forward-leaning position, by arranging some of the electronic components such as the relatively tall capacitor 86 within the handle portion 32, it is possible to prevent the size of the controller accommodating portion 34 from becoming large in the front-to-rear direction.

[0063] Furthermore, inside the handle portion 32, connection terminals 85A, 85B, and 85C are provided on both upper and lower sides of the capacitor 86. A motor wiring 83 extending from the coil of the motor 50 and a first wiring 84 extending from the controller board 81 are connected by the connection terminals 85A, 85B, and 85C. For this reason, the motor wiring 83, which is the wiring for supplying power to the motor 50, can be connected to the controller board 81 by utilizing the spaces on both upper and lower sides of the capacitor 86.

[0064] Further, the second wiring 88 extending forward from the lower end of the controller board 81 is routed from the controller accommodating portion 34 into the handle portion 32 and connected to the sensor board 54 of the motor 50. This makes it possible to utilize the lower space 34F formed in the controller accommodating portion 34 to route the second wiring 88, which is a signal line, in the lower space 34F, and to accommodate the connector 87 for connecting the second wiring 88 to the controller board 81 in the lower space 34F.

[0065] Furthermore, the controller accommodating portion 34 accommodates the terminal holder 36. The terminal holder 36 is disposed behind the controller 80, and in a plan view, the lower end of the controller 80 overlaps the front end of the terminal holder 36. This allows the controller 80 to be disposed adjacent to the terminal holder 36, with the lower end of the controller 80 wedged into the lower side of the terminal holder 36. This further prevents the controller accommodating portion 34 from becoming large in size in the front-to-rear direction.

[0066] Further, the third wiring 89 extending from the terminal 36A is arranged in the upper space 34E between the upper end of the controller 80 and the upper fixed boss 34B, and is connected to the controller board 81. That is, the upper space 34E is secured between the upper end of the controller 80 and the upper fixed boss 34B, and the third wiring 89 connecting the controller 80 and the terminal 36A can be arranged in the upper space 34E.

[0067] Furthermore, in a plan view, the controller case 82 and the operation panel 90 are arranged to overlap, and the controller case 82 does not protrude further outward in the front-to-rear direction than the operation panel 90. This allows the controller 80 to be accommodated in the controller accommodating section 34 while preventing the controller 80 from being tilted excessively in the up-down direction. In other words, it is possible to prevent the front-to-rear length of the controller 80 in a forward-leaning position from becoming longer. Therefore, the operation panel 90 and the controller 80 can be provided in the controller accommodating section 34 while effectively preventing the size of the controller accommodating section 34 from becoming larger in the front-to-rear direction.

[0068] In addition, in the grinder 10 of this embodiment, the return spring 74 that biases the slide bar 70 to the initial position is located at the same position as the motor switch 12 in the front-rear direction. That is, at least a part of the return spring 74 is located at the same position as the motor switch 12 in the front-rear direction. As a result, the length of the slide bar 70 in the front-rear direction in the handle housing 30 can be shortened compared to a configuration in which the motor switch 12 and the return spring 74 are entirely shifted in the front-rear direction. That is, the sliding length of the rear part of the slide bar 70 with the housing 20 can be shortened. This can suppress malfunction of the slide bar 70 caused by, for example, chips generated during grinding entering between the rear part of the slide bar 70 and the housing 20. Therefore, the operability of the grinder 10 when operating the switch lever 72 can be improved.

[0069] Further, a rear end 70D protruding to the right is provided at the rear end of the slide bar 70. The left part of the rear end 70D is configured as a spring accommodating portion 70E that accommodates and locks the rear end of the return spring 74, and the right part of the rear end 70D is configured as a switch pressing portion 70G that presses the plunger 12B of the motor switch 12. This allows the spring accommodating portion 70E and the switch pressing portion 70G to be arranged together in the left-right direction at the rear end 70D of the slide bar 70.

[0070] In addition, the motor switch 12 is disposed above the switch pressing portion 70G. This makes it possible to consolidate and dispose the rear end portion 70D of the slide bar 70, the return spring 74, and the motor switch 12 within the handle housing 30 while preventing the handle housing 30 from becoming too large in the left-right direction around the motor switch 12.

[0071] In addition, the rear end 70D of the slide bar 70 is supported from the left side by the handle housing 30 and from the right side by the right surface of the guide recess 24D of the switch holding portion 24. This suppresses the left-right vibration of the rear end 70D of the slide bar 70 when the slide bar 70 slides in the front-rear direction, and allows the slide bar 70 to slide smoothly. In particular, the rear end 70D of the slide bar 70 is offset to the right side relative to the front end, and the rear end 70D of the slide bar 70 is biased by the return spring 74. For this reason, a rotational moment is generated in the slide bar 70 such that the rear end 70D is displaced to the left, but as described above, the rear end 70D of the slide bar 70 is guided from the outside in the left-right direction, allowing the slide bar 70 to slide smoothly.

[0072] In addition, the rear end 70D of the slide bar 70 is supported from the outside in the up-down direction by the upper and lower surfaces of the guide recess 24D of the switch holding part 24. This makes it possible to suppress the rear end 70D from vibrating up and down when the slide bar 70 slides. As a result, the switch pressing part 70G of the rear end 70D can press the plunger 12B of the motor switch 12 satisfactorily.

[0073] Further, the switch holding portion 24 is formed with a guide recess 24D that is open to the left side. The rear end portion 70D of the slide bar 70 is accommodated in the guide recess 24D, and the opening of the guide recess 24D is covered by the rear end portion 70D of the slide bar 70 (more specifically, the left wall of the spring accommodating portion 70E at the rear end portion 70D) at a predetermined distance from the left side. This allows the slide bar 70 to prevent foreign matter from entering the guide recess 24D (switch holding portion 24). Therefore, it is possible to prevent foreign matter from entering the motor switch 12 held by the switch holding portion 24, and to improve the reliability of the grinder 10.

[0074] In addition, a pair of upper and lower support ribs 32A are formed on the handle portion 32, and the rear portion of the slide bar 70 is supported from the outside in the up-down direction by the pair of support ribs 32A. In addition, the right end portion of the support rib 32A is disposed adjacent to the left side of the switch holding portion 24, and is disposed so that the pair of support ribs 32A sandwich the opening of the guide recess 24D from the outside in the up-down direction when viewed from the left-right direction. This makes it possible to use the support rib 32A that supports the slide bar 70 from the outside in the up-down direction to close the opening of the guide recess 24D from the outside in the up-down direction. This makes it possible to further suppress the intrusion of foreign matter into the motor switch 12 held by the switch holding portion 24, and further improve the reliability of the grinder 10.

[0075] Furthermore, the return spring 74 is housed in the guide recess 24D. This allows the rear end 70D of the slide bar 70 and the return spring 74 to be disposed together in the switch holding portion 24 in a compact manner.

[0076] Moreover, when viewed from the front-rear direction, the return spring 74 is disposed at a position overlapping with the first motor bearing 55 of the motor 50. That is, the return spring 74 is disposed closer to the rotating shaft 51 of the motor 50. This makes it possible to prevent the return spring 74 from blocking the airflow that flows along the inner circumferential surface side of the handle housing 30 when the fan 58 rotates. This makes it possible to effectively direct the airflow toward the motor 50, thereby cooling the motor 50. [Explanation of symbols]

[0077] 10 Disc grinder (working machine) 12 Motor switch (switch) 20. Housing 21 Motor housing 22 Motor housing Switch holder 24 24D Guide recess (receiving recess) 30 Handle housing 32A Support rib 50 Motor 51 Rotation axis 55 First motor bearing (bearing) 70 Slide bar 70B Lever connection part 70E Spring housing part (locking part) 70G switch pressing part 72 Switch lever 74 Return spring (biasing member)

Claims

1. a motor having a rotation shaft whose axial direction is in the front-rear direction; a switch configured to be switchable between an ON state for driving the motor and an OFF state for stopping the motor; a housing that accommodates the motor and the switch; a slide bar extending in a front-rear direction, provided inside the housing so as to be slidable in the front-rear direction, and configured to slide from an initial position to an operating position on one side in the front-rear direction when operated, thereby switching the switch from an off state to an on state; a switch pressing portion provided on the slide bar, which presses the switch to turn on the switch when the slide bar is located at the operation position; a biasing member provided inside the housing and biasing the slide bar toward the other side in the front-rear direction; Equipped with A work machine in which at least a portion of the biasing member is located at the same position as the switch pressing portion in the front-rear direction.

2. a switch lever operably provided on the housing, connected to the slide bar, and configured to input an operating force to the slide bar; a lever connecting portion that is connected to the switch lever is provided at a front end of the slide bar, 2. The work machine according to claim 1, wherein the slide bar is provided with a locking portion to which the biasing member is locked and the switch pressing portion, which are arranged side by side in a direction perpendicular to the front-rear direction.

3. 3. The work machine according to claim 2, wherein the switch is disposed above the switch pressing portion.

4. The housing includes: a motor housing including a motor accommodating portion that accommodates the motor and a switch holding portion that is disposed on the rear side of the motor accommodating portion and that holds the switch; a handle housing that accommodates the switch holding portion; It is composed of 3. The work machine according to claim 2, wherein the biasing member is engaged with the switch holding portion.

5. 5. The work machine according to claim 4, wherein the rear end of the slide bar is supported from one side in the left-right direction by the handle housing and from the other side in the left-right direction by the switch holding portion.

6. 5. The work machine according to claim 4, wherein the rear end of the slide bar is supported from both sides in the vertical direction by the switch holding portion.

7. the switch holding portion has an accommodating recess that accommodates the switch pressing portion and the locking portion, 5. The work machine according to claim 4, wherein the storage recess is formed in a recessed shape that is open to one side in the left-right direction, and the opening of the storage recess is covered from one side in the left-right direction by the slide bar.

8. A pair of support ribs are formed on an inner peripheral surface on one side of the handle housing in the left-right direction, protruding toward the other side in the left-right direction and supporting the slide bar from the outside in the up-down direction, The work machine according to claim 7, wherein the support rib is arranged adjacent to one of the left and right sides of the switch holding portion and is arranged so as to sandwich the opening of the storage recess from the outside in the vertical direction when viewed from the left and right direction.

9. The work machine according to claim 8, wherein the urging member is accommodated in the accommodation recess.

10. 10. The work machine according to claim 9, wherein the biasing member is disposed at a position overlapping a bearing that supports the rotary shaft when viewed from the front-rear direction.

11. The work machine according to any one of claims 2 to 10, wherein a portion of the switch pressing portion that comes into contact with the switch is located forward of a position of the locking portion that supports the biasing member.

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