JP2022121170A - Switch mechanism for electric work machine and electric work machine - Google Patents

Abstract

To provide a new switch mechanism which can select an operation corresponding to a mode of work of a user.SOLUTION: A switch mechanism arranged in an electric work machine driven by a motor accommodated in a housing comprises: a switch which is accommodated in the housing, and supplies a motor with electric power in the ON state and stop supplying the motor with electric power in the OFF state; and an operation part which is movable in a first direction with respect to a reference position and a second direction opposite to the first direction, keeps the switch OFF when it is positioned at the reference position, and keeps the switch ON when it is positioned at the first position in the first direction with respect to the reference position and at the second position in the second direction with respect to the reference position.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a switch mechanism and an electric working device used in an electric working device.

2. Description of the Related Art A switch mechanism is known that is provided in an electric work machine and includes a switch for energizing a motor provided in the electric work machine and an operation unit for switching between an off state and an on state of the switch. Patent Literature 1 describes a grinder that includes a housing that accommodates a motor and a switch, and an operation section that is displaceably provided in the housing and switches the switch from an off state to an on state by displacement.

Japanese Patent No. 6803157

In the grinder described in Patent Literature 1, the operation portion is displaceably provided on the grip portion of the housing, and the user can easily operate the switch while gripping the housing. However, in recent years, there has been a demand for a new switch mechanism for electric power tools that allows a user to select an operation according to the type of work performed by the user.

The present disclosure can be implemented as the following forms.

(1) According to one aspect of the present disclosure, there is provided a switch mechanism provided in an electric working device. The electric working device is configured to be driven by a motor housed in a housing. The switch mechanism includes a switch housed in the housing and an operating portion. The switch is configured to apply power to the motor in an ON state and to stop applying power to the motor in an OFF state. The operating section is configured to be movable in a first direction with respect to a reference position and in a second direction opposite to the first direction with respect to the reference position. The operating portion is configured to hold the switch in the off state when positioned at the reference position. Further, the operating portion is configured to hold the switch in the ON state when positioned at the first position in the first direction with respect to the reference position. Further, the operating portion is configured to hold the switch in the ON state when positioned at a second position in the second direction with respect to the reference position.
According to this aspect, power is supplied to the motor when the operation unit is at the first position in the first direction with respect to the reference position and the second position in the second direction opposite to the first position. . Therefore, in order to supply electric power to the motor and drive the electric work machine, the user performs an operation of moving the operation unit from the reference position to the first position and moving the operation unit from the reference position to the second position in accordance with the work mode. You can select the operation to move.
(2) In the above aspect, the switch mechanism may include a biasing member. The biasing member may bias the operation portion from the first position to the reference position and from the second position to the reference position.
According to this aspect, the urging member urges the operating portion from the first position and the second position to the reference position, and can be returned to the reference position. Therefore, the operation section can be easily moved from the first position or the second position to the reference position. In addition, it is possible to prevent the user's finger or an object from unintentionally contacting the operation unit and keeping the switch in the ON state.
(3) In the above aspect, the first direction and the second direction may be directions along the longitudinal direction of the housing.
According to this aspect, when the user moves the electric work machine in the first direction, the user moves the operation unit from the reference position to the first position to drive the electric work machine, thereby moving the electric work machine. When performing the work of moving in the second direction, the operation unit can be moved from the reference position to the second position to drive the electric working machine. Therefore, it is possible to match the working direction with the operation direction of the operation unit for driving the electric working device. Therefore, it is possible to provide a switch mechanism with good operability.
(4) In the above aspect, the switch mechanism may include an intermediate member accommodated in the housing and interlocking with the operating portion. The intermediate member extends along the longitudinal direction, holds the switch in the ON state when the operating portion is at the first position and the second position, and the operating portion is at the reference position. The switch may be configured to be held in the off state at times.
According to this aspect, the switch can be held in the ON state or in the OFF state by the intermediate member interlocking with the operating portion. Therefore, it is possible to increase the degree of freedom in arranging the operation unit and the switch.
(5) In the above aspect, the switch may include a switch body and a switch lever extending in the longitudinal direction. A first end of the switch lever may be configured as a free end. Further, the switch lever may have a second end located in the second direction with respect to the first end connected to the switch body. The intermediate member may have an opening facing the switch and recessed in a direction away from the switch. Further, the intermediate member may be provided facing the switch, and may include a pushing portion located in the first direction and the second direction with respect to the opening portion. The switch body may be configured to hold the switch in an ON state by pushing the switch lever toward the switch body. Further, the switch body may be configured to hold the switch in an OFF state by releasing the push of the switch lever into the switch body. The intermediate member opens the switch lever toward the opening portion when the operation portion is at the reference position, and opens the switch lever when the operation portion moves to the first position and the second position. It may be configured to be pushed by the pushing portion.
According to this aspect, the switch can be switched between the ON state and the OFF state by using the shape of the intermediate member.
(6) In the above aspect, the housing may include a first housing that houses the motor, and a second housing positioned in the second direction with respect to the first housing. The switch may be housed in the second housing. At least a portion of the operating portion may be exposed from an opening provided in the first housing. The intermediate member may include an arm portion and a link portion. The arm portion may be formed so as to be connected to the operating portion and extend from inside the first housing to inside the second housing. The link portion may be connected to an end portion of the arm portion in the second direction, accommodated in the second housing, and provided to face the switch. The link portion may have the opening portion and the pushing portion.
According to this aspect, in the configuration in which the motor is accommodated in the first housing and the switch is accommodated in the second housing, the intermediate member can be used to switch between the ON state and the OFF state of the switch.
(7) In the above aspect, the housing includes a first groove portion for positioning the operation portion moved to the first position and a first groove portion for positioning the operation portion moved to the second position. 2 grooves may be provided. The operation portion may include an operation convex portion that can be engaged with the first groove portion and the second groove portion.
According to this aspect, by engaging the operation convex portion with the first groove portion, the state where the operation portion is at the first position can be continued. Similarly, by engaging the operation protrusion with the second groove, the operation portion can be maintained at the second position. Therefore, power supply to the motor can be easily continued.
(8) In the above aspect, the first direction and the second direction may be directions along a circumferential direction around a longitudinal direction of the housing.
According to this aspect, since the first direction and the second direction are directions along the circumferential direction of the housing, the user can adjust the first direction along the circumferential direction from the reference position according to the work mode. A choice can be made between moving to one position and moving to a second position in a second direction opposite the first direction.
(9) The housing may include a first housing and a second housing that are connected in the longitudinal direction of the housing. The second housing may be relatively rotatable along the circumferential direction with respect to the first housing, and may be configured to function as the operating portion. The switch may be supported by an extension member fixed to the first housing and extending from the first housing into the second housing and housed in the second housing.
According to this aspect, a novel switch mechanism is provided that can drive an electric operating device by rotating the second housing in the first direction or in the second direction with respect to the first housing. can do. In addition, since the second housing can be used as the operation portion, the design of the electric working machine can be improved compared to a configuration in which the operation portion is provided in the housing.
(10) In the above aspect, the switch may include a switch body and a switch lever extending in a width direction intersecting the longitudinal direction. A first end of the switch lever may be configured as a free end, and a second end in the second direction with respect to the first end may be connected to the switch body. The second housing may have an opening facing the switch and recessed in a direction away from the switch. Further, the second housing may be provided facing the switch and provided with a push-in portion located in the first direction and the second direction with respect to the open portion. The switch body may be configured to hold the switch in an ON state by pushing the switch lever toward the switch body. Further, the switch body may be configured to hold the switch in an OFF state by releasing the pushing of the switch lever into the switch body. The second housing may be configured to open the switch lever toward the opening portion when in the reference position. Further, the second housing may be configured such that the switch lever is pushed by the pushing portion when moved to the first position and the second position.
According to this aspect, the shape of the second housing can be used to switch between the ON state and the OFF state of the switch.
(11) In the above aspect, the first portion on the outer surface of the first housing and the second portion on the outer surface of the second housing are arranged to extend the length when the second housing is positioned at the reference position. are configured to be axially continuous, and extend in the longitudinal direction when the second housing is positioned at the first position and when the second housing is positioned at the second position; It may be configured so as not to be continuous.
According to this aspect, the user can know whether or not the switch mechanism is positioned at the reference position by checking whether or not the first portion and the second portion are continuous.
(12) In the above aspect, at least one of the connecting portion between the open portion and the pushing portion located in the first direction and the first end portion of the switch lever includes the longitudinal axis of the housing. Further, the inclined surface may be inclined from the second direction toward the first direction so as to approach a surface parallel to the width direction that intersects the major axis direction.
According to this aspect, compared to a configuration in which at least one of the connecting portion between the opening portion and the pushing portion and the first end portion of the switch lever does not have an inclined surface, the switch lever is easily moved by the operation portion. By smoothly interlocking, the state of being opened by the opening portion can be shifted to the state of being pushed into the push-in portion.
(13) According to a second aspect of the present disclosure, an electric working machine is provided. The electric working machine includes the switch mechanism of the above configuration and the motor accommodated in the housing, and is driven by the motor.
According to this aspect, it is possible to provide an electric working device capable of selecting between the operation of moving the operating portion from the reference position to the first position and the operation of moving the operation portion from the reference position to the second position according to the mode of work. can be done.
(14) In the above aspect, the electric working device has a spindle whose one end protrudes from the housing and is rotated by being driven by the motor; and a tip tool attached to the spindle. A grinding wheel can be used and may be configured to function as a grinder.
According to this aspect, it is possible to provide a grinder capable of selecting between the operation of moving the operation portion from the reference position to the first position and the operation of moving the operation portion from the reference position to the second position according to the work mode. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view showing the external appearance of the grinder 1 of 1st Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view showing the external appearance of the grinder 1 of 1st Embodiment. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. 4 is an enlarged view of the portion surrounded by the dashed line P in FIG. 3, and is a cross-sectional view for explaining the switch mechanism when the operating portion 60 is at the reference position; 4 is a top view of the switch mechanism 40 when the operation unit 60 is at the reference position, and a part of the cross-sectional view taken along line IV-IV of FIG. 3. FIG. 4 is a cross-sectional view for explaining the switch mechanism 40 when the operating portion 60 is at the first position; FIG. 4A and 4B are a top view and a part of a cross-sectional view of the switch mechanism 40 when the operating portion 60 is at the first position. FIG. 4 is a cross-sectional view for explaining the switch mechanism 40 when the operating portion 60 is at the second position; 4A and 4B are a top view and a part of a cross-sectional view of the switch mechanism 40 when the operating portion 60 is at the second position. It is a perspective view showing the external appearance of the grinder 1A in 2nd Embodiment, and is a figure explaining the grinder 1A when the 2nd housing 15A exists in a reference position. It is a perspective view of grinder 1A in the state where the 2nd housing 15A was removed from the 1st housing 13A. It is a side view showing the external appearance of grinder 1A when the 2nd housing 15A exists in a reference position. FIG. 13 is a diagram illustrating the switch mechanism 40A when the second housing 15A is at the reference position, and is a cross-sectional view taken along the line XIII-XIII of FIG. 12; It is a figure showing the external appearance of grinder 1A when the 2nd housing 15A exists in the 1st position. FIG. 11 is a cross-sectional view illustrating the switch mechanism 40A when the second housing 15A is at the first position; It is a figure showing the external appearance of grinder 1A when the 2nd housing 15A exists in the 2nd position. FIG. 11 is a cross-sectional view illustrating the switch mechanism 40A when the second housing 15A is at the second position;

<First embodiment>
An electric working machine according to a first embodiment and a switch mechanism 40 applied to the electric working machine will be described with reference to FIGS. 1 to 9. FIG. The electric working machine is a working machine driven by the motor 2 . Electric work equipment is also called electric equipment. The electric working device of the present embodiment is a so-called disk grinder (hereinafter also referred to as grinder 1 ) in which a grinding wheel can be attached to the tool attachment portion 31 .

<Schematic configuration of the grinder>
First, a schematic configuration of the grinder 1 will be described. As shown in FIGS. 1 to 3, the grinder 1 mainly includes a housing 10, a motor 2, a spindle 3, and a switch mechanism 40. As shown in FIGS.

A housing 10 defines the outer shell of the grinder 1 . The housing 10 is constructed as an elongated hollow body as a whole. As shown in FIG. 3, one end of the housing 10 accommodates the spindle 3 . The spindle 3 is arranged such that its rotational axis A1 intersects the longitudinal axis A0 of the housing 10. As shown in FIG. In this embodiment, the rotation axis A1 of the spindle 3 and the major axis A0 of the housing 10 are substantially orthogonal. One end of the spindle 3 in the longitudinal direction protrudes from the housing 10 and is exposed to the outside. This one end constitutes a tool mounting portion 31 to which the tip tool 91 can be attached and detached (see FIG. 3). A power cord 19 for supplying power to the motor 2 is connected to the other end of the housing 10 in the longitudinal direction.

Hereinafter, for convenience of explanation, regarding the directions of the grinder 1 and the switch mechanism 40, the extending direction of the rotation axis A1 is defined as the vertical direction. In the vertical direction, the tool mounting portion 31 side of the spindle 3 is defined as the lower side, and the opposite side is defined as the upper side. A direction orthogonal to the rotation axis A1 and corresponding to the longitudinal direction of the housing 10 is defined as a front-rear direction. In the front-rear direction, one end side of the housing 10 in which the spindle 3 is accommodated is defined as the front side, and the other end side to which the power cord 19 is connected is defined as the rear side. The front-rear direction is the combination of the forward direction (first direction) and the rearward direction (second direction). A direction orthogonal to the up-down direction and the front-rear direction is defined as the left-right direction. The left-right direction is also the width direction of the housing 10 .

The housing 10 comprises a spindle housing 11, a first housing 13 and a second housing 15, as shown in FIGS. The spindle housing 11, the first housing 13, and the second housing 15 are provided in this order from the front to the rear. As shown in FIG. 4, the first housing 13 is provided with an opening 133 in which the operation portion 60 of the switch mechanism 40 is arranged, and a first groove portion 131 and a second groove portion 132 for positioning the operation portion 60. ing. The first groove portion 131, the second groove portion 132, and the opening 133 are provided in the first housing 13 in this order from the front to the rear. The first housing 13 accommodates the motor 2 . The second housing 15 mainly accommodates a microswitch 50, which will be described later, and a control unit.

The first housing 13 and the second housing 15 are formed in a substantially cylindrical shape. The first housing 13 and the second housing 15 are connected in the longitudinal direction, and the front part of the second housing 15 is fitted to the rear part of the first housing 13 . In this embodiment, the first housing 13 and the second housing 15 are fitted together so that the inner peripheral surface of the front portion of the second housing 15 contacts the outer peripheral surface of the rear portion of the first housing 13 . The outer diameter of the first housing 13 and the outer diameter of the second housing 15 are sized to be grippable by the user. That is, in the present embodiment, the first housing 13 and the second housing 15 constitute a grip.

As shown in FIG. 3, the spindle 3 is arranged in a spindle housing 11. As shown in FIG. The spindle 3 extends vertically. The spindle 3 is supported by two bearings held in the spindle housing 11 so as to be rotatable around the rotation axis A1. A large bevel gear 33 is fixed to the upper end of the spindle 3 . A tool mounting portion 31 provided at the lower end of the spindle 3 includes two flanges. The tip tool 91 is clamped from above and below by these flanges and fixed to the spindle 3 . A detachable wheel cover 18 is attached to the lower end of the front end of the spindle housing 11 to prevent scattering of pieces of the workpiece and dust generated during the machining operation and to protect the user from the tip tool 91. It is Since the configurations of the tool mounting portion 31 and the wheel cover 18 are well known, detailed description thereof will be omitted.

The motor 2 is arranged in a first housing 13 behind the spindle 3 . The motor 2 is driven by being energized by operating the switch mechanism 40 . In this embodiment, a DC brushless motor is used as the motor 2 . The motor 2 has a motor body 21 including a stator and a rotor, and a motor shaft 23 extending from the rotor. The motor shaft 23 is supported by two bearings held in the housing 10 so as to be rotatable around the motor rotation axis A2. A rotation axis A2 of the motor shaft 23 is perpendicular to the rotation axis A1 of the spindle 3 and extends in the front-rear direction. In this embodiment, the long axis A0 of the housing 10 and the rotational axis A2 of the motor shaft 23 substantially coincide. A fan 27 for cooling the motor 2 is fixed on the motor shaft 23 between the motor body 21 and the front bearing.

A small bevel gear 24 is fixed to the front end of the motor shaft 23 and meshes with a large bevel gear 33 of the spindle 3 . The small bevel gear 24 and large bevel gear 33 constitute a reduction mechanism. The rotation of the motor shaft 23 is transmitted to the spindle 3 after the rotation speed is reduced by the small bevel gear 24 and the large bevel gear 33 . As a result, the spindle 3 is rotated around the rotation axis A<b>1 as the motor 2 is driven, and the tip tool 91 fixed to the tool mounting portion 31 is rotationally driven together with the spindle 3 .

The spindle housing 11 is provided with a mounting portion (not shown) for mounting an auxiliary handle. The auxiliary handle is a member that allows the user to hold the grinder 1 with both hands and enhances the user's holding force against reaction torque generated in the housing 10 during processing. The auxiliary handle is attached to the attachment portion so as to protrude from the spindle housing 11 in the width direction.

In the grinder 1 described above, when the operating portion 60 provided in the switch mechanism 40 is positioned at the ON position, the motor 2 rotates and the tip tool 91 is rotationally driven to grind, polish, cut, etc. the workpiece. It is configured to be able to perform machining work.

<Structure of Switch Mechanism>
The switch mechanism 40 will be described with reference to FIGS. 4 to 9. FIG. The switch mechanism 40 is a mechanism for switching between driving and stopping the grinder 1 by user's operation. The switch mechanism 40 includes an operation portion 60 mainly operated by a user, an intermediate member 70 that moves along with the operation portion 60, and a microswitch 50 that switches between an on state and an off state by movement of the intermediate member 70. Prepare.

4 and 5 show a state in which the operating section 60 is positioned at the reference position. 6 and 7 show a state in which the operating section 60 is positioned at the first position, and FIGS. 8 and 9 show a state in which the operating section 60 is positioned at the second position. 6 and 8 correspond to FIG. 4, and FIGS. 7 and 9 correspond to FIG. The switch mechanism 40 does not supply power to the motor 2 when the operating portion 60 is at the reference position (see FIGS. 4 and 5), and does not supply power to the motor 2 when the operating portion 60 is at the first position forward of the reference position (see FIGS. 6 and 6). 7), and when the operation unit 60 is at the second position behind the reference position (see FIGS. 8 and 9), power is supplied to the motor 2 . Normally, the operating section 60 is positioned at the reference position. The first position and the second position have a predetermined width in the front-rear direction. The reference position is also called the OFF position, and the first and second positions are also called the ON position. In the switch mechanism 40 of the present embodiment, the microswitch 50 is held in the OFF state when the operating portion 60 is positioned at the reference position, and is positioned at the second position when the operating portion 60 is positioned at the first position. The microswitch 50 is configured to be held in the ON state when the switch is turned on. Details of each part of the switch mechanism 40 will be described below.

First, the microswitch 50 will be explained. A microswitch 50 is housed in the rear portion of the second housing 15 . The microswitch 50 includes a switch case 51 , a detector 52 and a switch lever 53 .

The switch case 51 is fixed to the housing 10 . The detector 52 is held by the switch case 51 and protrudes upward from the switch case 51 (see FIG. 4). The detector 52 is configured to be able to be pushed toward the switch case 51 .

In the microswitch 50 of this embodiment, the detection unit 52 outputs an ON signal to a control unit (not shown) when pushed into the switch case 51 (ON state), and outputs an ON signal when the push is released. stop (off state). The control unit is configured to supply electric power from the external power supply to the motor 2 to drive the motor 2 when the ON signal is output.

The switch lever 53 is a substantially strip-shaped member extending in the front-rear direction. The switch lever 53 is arranged vertically between the detection portion 52 and a link portion 80 to be described later. A rear end (second end 532 ) of the switch lever 53 is connected to the switch case 51 . A front end (first end 531) of the switch lever 53 is configured as a free end. The switch lever 53 is vertically movable around the second end 532 . The switch lever 53 pushes the detecting portion 52 by being pushed by the link portion 80 . When the switch lever 53 is released from being pushed by the link portion 80 , the switch lever 53 is released from being pushed into the detection portion 52 .

In this embodiment, the first end portion 531 is provided with an inclined surface 533 . The inclined surface 533 is inclined from the second direction toward the first direction so as to approach a plane R (see FIG. 4) that includes the long axis A0 and extends along the width direction. In this embodiment, the inclined surface 533 is inclined downward from rear to front.

The microswitch 50 constructed as described above is normally in an OFF state in which the switch lever 53 is released from being pushed into the detecting portion 52 (see FIG. 4). The microswitch 50 is turned on when the detecting portion 52 is pushed downward by the switch lever 53 (see FIGS. 6 and 8).

Next, the operating section 60 will be described. The operation part 60 is arranged in the opening 133 such that a part thereof is located inside the first housing 13 and the other part is exposed above the first housing 13 . The operation unit 60 is movable in the front-rear direction. The operation unit 60 is also called a slide switch. The operation portion 60 includes a main operation portion 61 , an operation convex portion 62 and a connecting portion 63 .

The main operation section 61 is a part of the operation section 60 that is operated by the user's fingers, and is arranged above the opening 133 . The main operation unit 61 is a substantially plate-shaped member with a substantially central portion in the front-rear direction recessed downward along the fingers of the user, and front and rear ends separated upward from the upper surface of the first housing 13 .

The operation convex portion 62 is a portion projecting downward from the front end of the main operation portion 61 . The lower end of the operation convex portion 62 protrudes so as to be positioned below the lower surface 611 of the main operation portion 61 . As shown in FIG. 4 , the operating projection 62 is normally positioned on the reference wall 139 positioned between the first groove 131 and the second groove 132 of the first housing 13 .

In the present embodiment, when the operation portion 60 is at the reference position is when the operation convex portion 62 (that is, the front end of the operation portion 60) is positioned substantially in the middle of the reference wall 139. As shown in FIG. Further, when the operation portion 60 is at the first position, the operation convex portion 62 is positioned forward from substantially the middle of the reference wall 139 . Further, when the operation portion 60 is at the second position, the operation convex portion 62 is positioned substantially in the middle to the rear of the reference wall 139 .

The connecting portion 63 is a portion configured to be inserted into the opening 133 and engage the operating portion 60 and the intermediate member 70 . In this embodiment, the connecting portion 63 is formed so as to protrude downward from the main operating portion 61 behind the operating convex portion 62 and bend forward at its lower end portion.

Next, the intermediate member 70 will be described. The intermediate member 70 is a member for transmitting the operation of the operating portion 60 to the microswitch 50 . The intermediate member 70 is housed in the first housing 13 and the second housing 15 . The intermediate member 70 includes an arm portion 71 positioned above the motor 2 and a link portion 80 connected to the rear portion of the arm portion 71 .

The arm portion 71 is a substantially plate-shaped portion extending in the front-rear direction. The arm portion 71 is arranged above the motor 2 . An opening 711 penetrating vertically is provided in the front portion of the arm portion 71 . The connecting portion 63 described above is inserted into the opening 711 and engaged with the arm portion 71 .

The link portion 80 is a block-shaped portion connected to the rear portion of the arm portion 71 . The link portion 80 is formed to protrude downward from the arm portion 71 . The link part 80 is provided behind the motor 2 and above the microswitch 50 . The link portion 80 is configured such that the detection portion 52 can be pushed in and the pushing can be released as the link portion 80 moves in the front-rear direction. That is, the link portion 80 (intermediate member 70) and the microswitch 50 hold the microswitch 50 in the OFF state when the operation portion 60 is at the reference position, and the operation portion 60 is at the first position and the second position. It is positioned within the housing 10 to hold the microswitch 50 in the ON state when necessary.

In this embodiment, the link portion 80 includes pushing portions 821 and 822 for pushing the switch lever 53 toward the detection portion 52 and an opening portion 81 for releasing the push of the switch lever 53 to the detection portion 52 .

The open portion 81 is a concave portion recessed in the link portion 80 in the direction away from the microswitch 50 . In this embodiment, the opening 81 is recessed upward when viewed from the microswitch 50 . The push-in portions 821 and 822 are portions that constitute the lower end of the link portion 80 . The push-in portion 821 is positioned in front of the opening portion 81 and the push-in portion 822 is positioned behind the opening portion 81 . The push-in portions 821 and 822 are located below the bottom (upper surface 811) of the open portion 81. As shown in FIG. At the connecting portion between the opening portion 81 and the pushing portion 821, the inclined surface 533 is formed as an inclined surface 823 that inclines so as to approach the plane R from the second direction toward the first direction. In this embodiment, the inclined surface 823 is inclined downward from rear to front. The inclination angle of the inclined surface 823 of the link portion 80 and the inclination angle of the inclined surface 533 of the switch lever 53 are substantially equal.

In this embodiment, the pushing portion 822 pushes the switch lever 53 downward when the operating portion 60 moves forward (first position) from the reference position. The pushing portion 821 pushes the switch lever 53 downward when the operating portion 60 moves backward (second position) from the reference position.

Switch mechanism 40 further comprises a biasing member 90 . The biasing member 90 is provided in the switch mechanism 40 so as to bias the operating portion 60 to the reference position via the intermediate member 70 . In this embodiment, the biasing member 90 is a compression coil spring.

In this embodiment, the housing 10 is provided with support portions 141 and 142 for supporting the biasing member 90 on the housing 10 . The support portions 141 and 142 are arranged along the front-rear direction inside the second housing 15 so as to face each other. Normally, the front end of the biasing member 90 is supported by the supporting portion 141, and the rear end of the biasing member 90 is supported by the supporting portion 142 (see FIGS. 4 and 5).

In addition, the intermediate member 70 is provided with projecting portions 721 and 722 facing each other in the front-rear direction. The protruding portion 721 is provided at the rear and lower portion of the arm portion 71 and protrudes rearward. The projecting portion 722 projects forward from the link portion 80 . As shown in FIGS. 4 and 5, the projection 721 is inserted into the front end of the biasing member 90 and the projection 722 is inserted into the rear end of the biasing member 90 at all times.

When the operating portion 60 is moved forward, the biasing member 90 is compressed in the front-rear direction by being pushed by the projecting portion 722 at its rear end while its front end is supported by the support portion 141 of the housing 10 (FIG. 6, see Figure 7). Therefore, the intermediate member 70 moved forward from the reference position is urged rearward (reference position) by the urging member 90 .

Further, when the operating portion 60 is moved rearward, the biasing member 90 is compressed in the front-rear direction by being pushed by the projecting portion 721 at its front end while its rear end is supported by the support portion 142 (FIG. 8). , see FIG. 9). Therefore, the intermediate member 70 that has moved rearward from the reference position is urged forward (reference position) by the urging member 90 .

Next, operation of the switch mechanism 40 will be described. The operation unit 60 is normally positioned at the reference position (OFF position) as shown in FIGS. 4 and 5 . At this time, the switch lever 53 of the microswitch 50 is opened to the open portion 81 of the link portion 80 (see FIG. 4), and the microswitch 50 is held in the OFF state.

When the user moves the operating portion 60 forward from the reference position against the biasing force of the biasing member 90 , the intermediate member 70 moves forward in conjunction with the operating portion 60 . The pushing portion 822 of the link portion 80 pushes the detection portion 52 downward via the switch lever 53 as it moves forward (see FIGS. 6 and 7). When the detecting portion 52 is pushed by the pushing portion 822, the microswitch 50 is switched from the off state to the on state. As a result, power is supplied to the motor 2 to drive the grinder 1 .

Further, when the user moves the operating portion 60 backward from the reference position against the biasing force of the biasing member 90 , the intermediate member 70 moves backward in conjunction with the operating portion 60 . The pushing portion 821 of the link portion 80 pushes the detecting portion 52 downward via the switch lever 53 as it moves rearward (see FIGS. 8 and 9). When the detecting portion 52 is pushed by the pushing portion 821, the microswitch 50 is switched from the off state to the on state. As a result, power is supplied to the motor 2 to drive the grinder 1 .

As described above, the first end portion 531, which is the free end of the switch lever 53, is provided with the sloped surface 533 that slopes downward from the rear to the front. A connecting portion between the open portion 81 and the push-in portion 821 of the link portion 80 is also provided with an inclined surface 823 that is inclined downward from the rear to the front. Therefore, the switch lever 53 smoothly interlocks with the movement of the link portion 80 and shifts from the state opened by the open portion 81 to the state pushed into the push-in portion 821 .

As shown in FIGS. 6 and 7, when the user releases the operation unit 60 in the state where the operation unit 60 is positioned at the first position, the intermediate member 70 is pushed by the biasing force of the biasing member 90. Moving rearward, the operation unit 60 returns to the reference position (see FIGS. 4 and 5). The switch lever 53 pushed into the pushing portion 822 is opened to the opening portion 81 as the intermediate member 70 moves rearward, and the microswitch 50 is switched from the ON state to the OFF state. As a result, the power supply to the motor 2 is stopped and the grinder 1 is stopped.

Similarly, as shown in FIGS. 8 and 9 , when the user releases the operation unit 60 with the operation unit 60 positioned at the second position, the biasing force of the biasing member 90 causes the intermediate member 70 to move. moves forward, and the operation unit 60 returns to the reference position (see FIGS. 4 and 5). Further, the switch lever 53 pushed into the pushing portion 821 is opened to the opening portion 81 as the intermediate member 70 moves forward, and the microswitch 50 is switched from the ON state to the OFF state. As a result, the power supply to the motor 2 is stopped and the grinder 1 is stopped.

Further, in the present embodiment, when the user moves the operation portion 60 to the first groove portion 131 (see FIG. 6) and pushes the front end of the operation portion 60 downward, the operation convex portion 62 is engaged with the first groove portion 131. combined. As a result, since the operating portion 60 is positioned at the first position, power supply to the motor 2 is continued even if the user does not keep pushing the operating portion 60 forward. Also, when the user moves the operation portion 60 to the second groove portion 132 (see FIG. 8) and pushes the front end of the operation portion 60 downward, the operation convex portion 62 is engaged with the second groove portion 132 . As a result, since the operating portion 60 is positioned at the second position, power supply to the motor 2 is continued even if the user does not keep pushing the operating portion 60 backward. Thus, the operation convex portion 62, the first groove portion 131, and the second groove portion 132 function as a lock-on mechanism that keeps the motor 2 on.

The main operating portion 61 is formed such that the substantially central portion in the front-rear direction is recessed downward, and the front and rear ends are spaced upward from the upper surface of the first housing 13 . Therefore, when the user pushes the rear part of the operation part 60 downward in a state where the operation protrusion 62 is engaged with the first groove 131 or in a state where the operation protrusion 62 is engaged with the second groove 132, the operation protrusion 62 moves upward with connecting portion 63 as a fulcrum. As a result, the engagement between the operation protrusion 62 and the first groove 131 or between the operation protrusion 62 and the second groove 132 is released. When the user releases the operating portion 60 in this state, the operating portion 60 returns to the reference position due to the biasing force of the biasing member 90 .

<effect>
According to the switch mechanism 40 and the grinder 1 of this embodiment described above, the following effects are obtained.

The switch mechanism 40 includes an operation portion 60 operated by a user, an intermediate member 70 that moves along with the operation portion 60, and a microswitch 50 that switches between an ON state and an OFF state by movement of the intermediate member 70. The switch mechanism 40 supplies electric power to the motor 2 when the operating portion 60 is at a first position in a first direction with respect to the reference position and a second position in a second direction opposite to the first position. is configured as follows. Therefore, the user can select between the operation of moving the operation unit 60 from the reference position to the first position and the operation of moving the operation unit 60 from the reference position to the second position according to the mode of work.

The switch mechanism 40 includes a biasing member 90 that biases the operating portion 60 from the first position to the reference position and from the second position to the reference position via the intermediate member 70 . Therefore, the operation unit 60 can be easily moved (returned) from the first position and the second position to the reference position. Further, for example, when a user's finger or an object unintentionally touches the operation unit 60, driving of the grinder 1 can be suppressed.

In the present embodiment, the operating portion 60 is movable in a direction along the longitudinal direction (front-rear direction) of the housing 10 . Therefore, for example, when the user moves the grinder 1 forward, the user can move the operation unit 60 forward from the reference position (OFF position) to drive the grinder 1 . Further, for example, when the user performs work to move the grinder 1 backward, the user can move the operation unit 60 backward from the reference position (OFF position) to drive the grinder 1 . Therefore, the working direction and the operating direction of the operating portion 60 for driving the grinder 1 can be matched. Therefore, it is possible to provide the switch mechanism 40 with good operability.

The intermediate member 70 extends along the longitudinal direction, holds the microswitch 50 in the ON state when the operation portion 60 is at the first position and the second position, and holds the microswitch 50 at the reference position when the operation portion 60 is at the reference position. 50 in the off state. Therefore, it is possible to increase the degree of freedom in arranging the operating portion 60 and the microswitch 50 in the grinder 1 .

The switch mechanism 40 of this embodiment includes a microswitch 50 as a switch for switching the motor 2 between an ON state and an OFF state. Therefore, for example, the grinder 1 can be configured to be small compared to a configuration including a switch other than the microswitch 50 such as a mechanical switch. In addition, the degree of freedom in arranging the parts constituting the grinder 1 can be improved.

The link portion 80 of the intermediate member 70 includes an open portion 81 , a push-in portion 821 provided in front of the open portion 81 , and a push-in portion 822 provided behind the open portion 81 . The switch mechanism 40 is configured such that the switch lever 53 is opened to the opening portion 81 when the operation portion 60 is at the reference position. Therefore, by using the shape of the intermediate member 70 (link portion 80), the microswitch 50 can be switched between the ON state and the OFF state, and the motor 2 can be switched between the ON state and the OFF state.

A first end portion 531 of the switch lever 53 is provided with an inclined surface 533 that is inclined downward from rear to front. A connecting portion between the open portion 81 and the push-in portion 821 is provided with an inclined surface 823 that is inclined downward from the rear to the front. Therefore, compared to a configuration in which none of the inclined surfaces 533 and 823 are provided, the switch lever 53 is smoothly interlocked with the movement of the link portion 80, and the switch lever 53 is moved from the state opened to the opening portion 81 to the pushing portion 821. It can be shifted to a state where it is pushed into.

The grinder 1 of this embodiment includes the switch mechanism 40 described above. Therefore, the user can drive the grinder 1 by either the operation of moving the operation unit 60 forward from the reference position (off position) or the operation of moving the operation unit 60 backward from the reference position. Therefore, the grinder 1 with high convenience can be provided.

<Second embodiment>
A switch mechanism 40A and a grinder 1A according to the second embodiment will be described below with reference to FIGS. 10 to 17. FIG. In the following description, the same symbols are used for the same configurations as in the above-described embodiment, and the description thereof is omitted.

The housing 10A includes a spindle housing 11, a first housing 13A and a second housing 15A. The spindle housing 11, the first housing 13A, and the second housing 15A are arranged in this order from the front to the rear.

The first housing 13A and the second housing 15A are formed in a substantially cylindrical shape. The first housing 13A and the second housing 15A are connected in the longitudinal direction. In this embodiment, the front portion of the second housing 15A is slidably fitted to the rear portion of the first housing 13A. The inner peripheral surface of the front portion of the second housing 15A is in contact with the outer peripheral surface of the rear portion of the first housing 13A. In the housing 10A of the present embodiment, the second housing 15A is arranged in a first direction along the circumferential direction that is the direction around the long axis A0 with respect to the first housing 13A, and in a second direction opposite to the first direction. It is configured to rotate to In this embodiment, the first direction is the counterclockwise direction and the second direction is the clockwise direction. As in the first embodiment, the outer diameter of the first housing 13A and the outer diameter of the second housing 15A are sized to be grippable by the user.

The first housing 13A accommodates the motor 2 as in the first embodiment. An extending member 14A extending rearward from the first housing 13A is arranged in the second housing 15A (see FIG. 11). Extension member 14A includes, for example, the rear portion of motor shaft 23 and bearings for motor shaft 23 . In this embodiment, the extension member 14A is fixed to the first housing 13A and not fixed to the second housing 15A. Therefore, the extension member 14A does not rotate with the rotation of the second housing 15A. It can also be said that the second housing 15A rotates with respect to the extension member 14A. Further, since the extension member 14A includes the motor shaft 23, it can be said that the second housing 15A rotates about the rotation axis A2 of the motor 2 in the first direction and the second direction.

Although the details will be described later, in the present embodiment, the second housing 15A functions as an operation section for switching the motor 2 (the grinder 1A) between an ON state and an OFF state. Normally, the plane (upper surface 131A) of the outer surface of the first housing 13A and the plane (upper surface 151A) of the outer surface of the second housing 15A are substantially parallel (see FIG. 10). In other words, the upper surface 131A and the upper surface 151A are always continuous with the upper portion of the housing 10A. When the second housing 15A rotates in the first direction (see FIG. 14A) or in the second direction (see FIG. 16A) from the state shown in FIG. 10, the upper surface 151A intersects with the upper surface 131A. . Note that, in this embodiment, unlike the first embodiment, the first housing 13A is not provided with the opening 133 in which the operating portion 60 is arranged.

10, 11, and 13 show a state in which the second housing 15A (operation section) is positioned at the reference position. 14 and 15 show the second housing 15A positioned at the first position, and FIGS. 16 and 17 show the second housing 15A positioned at the second position. 14 and 16 correspond to FIG. 12, and FIGS. 15 and 17 correspond to FIG. 14 and 16, the directions in which the second housing 15A is rotated are indicated by bold arrows.

The switch mechanism 40A will be described below. 40 A of switch mechanisms are provided with the 2nd housing 15A as an operation part, and 50 A of micro switches. The switch mechanism 40A holds the microswitch 50A in an OFF state when the second housing 15A is positioned at the reference position, and when the second housing 15A is positioned at the first position and when the second housing 15A is positioned at the second position. When positioned in the position, the microswitch 50A is configured to be held in the ON state.

The microswitch 50A is fixed to the extension member 14A and arranged in the upper part within the second housing 15A. The center of the microswitch 50A in the left-right direction is located on a plane Q along the up-down direction passing through the long axis A0 (see FIG. 13). The microswitch 50A includes a switch case 51A, a detector 52A, and a switch lever 53A, as in the first embodiment.

The switch case 51A is arranged along the left-right direction and fixed to the extending member 14A. The detector 52A protrudes upward from the switch case 51A. The switch lever 53A is arranged along the left-right direction. A first end portion 531A of the switch lever 53A is configured as a free end. A second end portion 532A of the switch lever 53A is fixed to the switch case 51A. The first end portion 531A is positioned on the left side of the plane Q (first direction), and the second end portion 532A is positioned on the right side of the plane Q (second direction). A first end portion 531A of the switch lever 53 is provided with an inclined surface 533A extending from the second direction to the first direction so as to approach a plane R1 (see FIG. 13) extending in the left-right direction and including the long axis A0. It is The inclined surface 533A is inclined downward from right to left. The rest of the configuration of the microswitch 50A is the same as that of the first embodiment, so the description is omitted.

The second housing 15A includes pushing portions 181A and 182A for pushing the switch lever 53A toward the detecting portion 52A, and an opening portion 16A for releasing the pushing of the switch lever 53A to the detecting portion 52A.

The open portion 16A is a recess formed by recessing the inner wall 152A of the second housing 15A in the direction away from the microswitch 50A. The center of the open portion 16A in the circumferential direction is generally positioned on the plane Q at all times. The push-in portion 181A is a portion of the inner wall 152A positioned in the first direction (left) with respect to the open portion 16A, and the push-in portion 182A is positioned in the second direction (right) of the inner wall 152A with respect to the open portion 16A. It is a part to do. The push-in portions 181A and 182A are located on the rotation axis A2 side (diameter direction inner side) of the bottom (upper surface 161A) of the open portion 16A. A connecting portion between the open portion 16A and the push-in portion 181A is formed as an inclined surface 183A that inclines from the second direction toward the first direction so as to approach the plane R1. In this embodiment, the inclined surface 183A is inclined downward from right to left. The inclination angle of the inclined surface 183A is substantially equal to the inclination angle of the inclined surface 533A of the switch lever 53A.

In this embodiment, the push-in portion 182A pushes the switch lever in a predetermined range in the circumferential direction when the second housing 15A is moved in the first direction from the reference position, that is, when the second housing 15A is turned counterclockwise. Push 53A downward. Similarly, when the second housing 15A moves from the reference position in the second direction, that is, when the second housing 15A is turned to the right, the push-in portion 182A moves the switch lever 53A within a predetermined range in the circumferential direction. downwards.

The switch mechanism 40A further includes a biasing member 90A. In this embodiment, the biasing member 90A is a compression coil spring. The biasing member 90A is provided in the switch mechanism 40A so as to bias the second housing 15A to the reference position. In this embodiment, the second housing 15A has a recess 171A provided on the left side of the push-in portion 181A. Further, the extension member 14A is provided at a position facing the recess 171A when the second housing 15A is positioned at the reference position, and has a recess 141A recessed in a direction away from the recess 171A. 171 A of recessed parts and 141 A of recessed parts are formed along the circumferential direction. The end (first end 93A) of the biasing member 90A in the first direction is normally the end (first end 173A) of the recess 171A in the first direction and the end of the recess 141A in the first direction. (first end 143A). In addition, the end portion (second end portion 94A) of the biasing member 90A in the second direction is always the end portion (second end portion 174A) of the recess 171A in the second direction and the end portion (second end portion 174A) of the recess 141A in the second direction. It is supported by the end (second end 144A).

As shown in FIGS. 14 and 15, when the second housing 15A moves in the first direction from the reference position, the recess 171A also moves in the first direction. Then, as shown in FIG. 15, the first end 93A of the biasing member 90A is supported by the first end 143A in the recess 141A of the extension member 14A, while the second end 94A is supported by the second housing 15A. is pushed by the second end 174A in the recess 171A and moves in the first direction. Therefore, the biasing member 90A is compressed in the first direction. As a result, the second housing 15A moved in the first direction from the reference position is biased in the second direction (reference position) by the biasing member 90A.

Further, as shown in FIGS. 16 and 17, when the second housing 15A moves from the reference position in the second direction, the recess 171A also moves in the second direction. Then, as shown in FIG. 17, the second end 94A of the biasing member 90A is supported by the second end 144A in the recess 141A of the extension member 14A, while the first end 93A is supported by the second housing 15A. is pushed by the first end 173A in the recess 171A and moves in the second direction. Therefore, the biasing member 90A is compressed in the second direction. As a result, the second housing 15A moved in the second direction from the reference position is biased in the first direction (reference position) by the biasing member 90A.

Next, operation of the switch mechanism 40A will be described. The second housing 15A is normally positioned at the reference position as shown in FIGS. 10 and 13. FIG. At this time, the switch lever 53A of the microswitch 50A is opened to the open portion 16A (see FIG. 13), and the microswitch 50A is held in the OFF state.

When the user moves the second housing 15A from the reference position in the first direction against the biasing force of the biasing member 90A, the pushing portion 182A of the second housing 15A moves along with the movement in the first direction. Push the lever 53A downward (see FIGS. 14 and 15). When the detecting portion 52A is pushed by the switch lever 53A, the microswitch 50A is switched from the OFF state to the ON state. As a result, power is supplied to the motor 2 to drive the grinder 1A.

Further, when the user moves the second housing 15A in the second direction from the reference position against the biasing force of the biasing member 90A, the push-in portion 181A of the second housing 15A moves in the second direction. to push the switch lever 53A downward (see FIGS. 16 and 17). When the detecting portion 52A is pushed by the switch lever 53A, the microswitch 50A is switched from the OFF state to the ON state.

A first end portion 531A, which is a free end of the switch lever 53A, is provided with an inclined surface 533A that inclines downward from right to left. An inclined surface 183A is provided at the connecting portion between the opening portion 16A and the pushing portion 182A. Therefore, the switch lever 53A smoothly interlocks with the movement of the second housing 15A, and shifts from the state opened by the open portion 81 to the state pushed into the push-in portion 181A.

14 and 15, when the second housing 15A is positioned at the first position, when the user releases the second housing 15A, the second housing is moved by the biasing force of the biasing member 90A. 15A moves in the second direction and returns to the reference position (see FIG. 13). The switch lever 53A pushed into the pushing portion 182A is opened to the opening portion 16A as the second housing 15A moves in the second direction, and the microswitch 50A is switched from the ON state to the OFF state. As a result, the power supply to the motor 2 is stopped and the grinder 1A is stopped.

Similarly, in a state where the second housing 15A is positioned at the second position as shown in FIGS. moves forward, and the operation unit 60 returns to the reference position (see FIG. 13). Further, the switch lever 53A pushed into the pushing portion 182A is opened to the opening portion 16A as the second housing 15A moves in the first direction, and the microswitch 50A is switched from the ON state to the OFF state. As a result, the power supply to the motor 2 is stopped and the grinder 1A is stopped.

<effect>
In the second embodiment described above, the second housing 15A is rotatable about the major axis A0 in the first direction (right direction) and the second direction (left direction) with respect to the first housing 13A. There is, and it functions as an operation part of 40 A of switch mechanisms. The switch mechanism 40A turns on the microswitch 50A when the second housing 15A is at the first position in the first direction from the reference position and at the second position in the second direction from the reference position. configured to hold. Therefore, in order to supply electric power to the motor 2 and drive the grinder 1A, the user performs an operation of rotating the second housing 15A rightward and an operation of rotating the second housing 15A leftward according to the work mode. can be selected.

Also, the user grips the first housing 13A (or an auxiliary handle connected to the first housing 13A) with one hand, and grips the second housing 15A with the other hand, and moves in the first direction or the first direction from the reference position while gripping the second housing 15A with the other hand. By moving in two directions, the grinder 1A can be driven. Therefore, for example, when processing a wall along the vertical direction, the grinder 1A can be pressed against the wall by rotating the second housing 15A while holding the first housing 13A with one hand. . Therefore, the direction of pressing the grinder 1A and the direction of operation of the operating portion (second housing 15A) for driving the grinder 1A can be matched in the machining operation. As a result, it is possible to provide the switch mechanism 40A and the grinder 1A with good operability.

In addition, since the second housing 15A can be used as the operating portion, the design of the grinder 1A can be improved compared to a configuration in which the operating portion is separately provided in the housing 10A.

Further, the second housing 15A includes an open portion 16A provided to normally open the switch lever 53A, a push-in portion 181A provided in the first direction of the open portion 16A to push the switch lever 53A, and the open portion 16A. and a push-in portion 822 provided in the second direction of the switch lever 53A. Therefore, by using the shape of the second housing 15A, the microswitch 50A can be switched between the ON state and the OFF state, and the motor 2 can be switched between the ON state and the OFF state.

The switch mechanism 40A also includes a biasing member 90A that returns the second housing 15A to the reference position. Therefore, the second housing 15A can be easily moved (returned) from the first position and the second position to the reference position. Further, for example, when a user's finger or an object unintentionally contacts the second housing 15A so as to rotate it, it is possible to prevent the grinder 1A from being driven.

Further, the upper surface 131A of the first housing 13A and the upper surface 151A of the second housing 15A are provided so as to be parallel when the second housing 15A is positioned at the reference position. Therefore, the user can easily distinguish between the OFF state and the ON state of the grinder 1A.

Further, similarly to the first embodiment, the switch mechanism 40 includes a microswitch 50A as a switch for switching the motor 2 between the ON state and the OFF state. Therefore, the grinder 1 can be made small. In addition, it is possible to improve the degree of freedom in arranging the parts that constitute the grinder 1A.

Furthermore, the first end portion 531A of the switch lever 53A is provided with an inclined surface 533A that inclines downward from right to left. A connecting portion between the opening portion 16A and the pushing portion 181A is provided with an inclined surface 183A along the inclined surface 533A. Therefore, the switch lever 53A can be smoothly interlocked with the movement of the second housing 15A, and can be moved from the state opened by the open portion 16A to the state pushed into the push-in portion 181A.

<Correspondence relationship>
A correspondence relationship between each component of the above embodiment and each component of the technique of the present disclosure is shown below. The grinders 1 and 1A are examples of "electric working equipment" or "grinders."
The switch mechanisms 40 and 40A are examples of "switch mechanisms."
Housings 10 and 10A are examples of "housings."
The motor 2 is an example of a "motor."
Microswitches 50 and 50A are examples of "switches."
The operation part 60 and the second housing 15A are examples of the "operation part".
Long axis A0 is an example of a "long axis." The forward direction and the counterclockwise circumferential direction are examples of the “first direction”. The backward direction and the clockwise direction in the circumferential direction are examples of the "second direction".
The biasing members 90 and 90A are examples of "biasing members."
The intermediate member 70 is an example of an "intermediate member".
The arm portion 71 is an example of the "arm portion 71", and the link portion 80 is an example of the "link portion".
The switch cases 51, 51A and the detectors 52, 52A are examples of the "switch body".
The switch levers 53 and 53A are examples of "switch levers."
The first ends 531 and 531A are examples of the "first end", and the second ends 532 and 532A are examples of the "second end".
The openings 81 and 16A are examples of "openings."
The pushing parts 821, 822, 181A, and 182A are examples of "pushing parts".
The first groove portion 131 is an example of the "first groove portion 131", and the second groove portion 132 is an example of the "second groove portion".
The operation convex portion 62 is an example of the "operation convex portion".
The first housings 13, 13A are an example of a "first housing". The second housings 15 and 15A are examples of "second housings."
The stretching member 14A is an example of a "stretching member".
The upper surface 131A is an example of the "first part", and the upper surface 151A is an example of the "second part".
Spindle 3 is an example of a "spindle". The tip tool 91 is an example of a "tip tool."

<Other embodiments>
In the above embodiments, the switch mechanisms 40A, 40A (grinders 1, 1A) may be provided with a lock-off mechanism for holding the operating portion 60 and the second housing 15A at the reference position (OFF position).

In the first embodiment, the first direction may be the rearward direction and the second direction may be the forward direction. Also, the operating portion 60 of the switch mechanism 40 may be provided at a portion other than the first housing 13 . For example, the operation part 60 may be provided on the lower wall or side wall of the first housing 13 and the second housing 15 . Further, the operating portion 60 may be provided on the housing 10 so as to move in the left-right direction and the up-down direction instead of the front-rear direction.

In the second embodiment, the first direction may be circumferentially clockwise, and the second direction may be circumferentially counterclockwise. In addition, the switch mechanism 40A may be configured so that the second housing 15A rotates relative to the first housing 13A. good too.

The switch mechanisms 40, 40A may not have the biasing members 90, 90A. Further, when the switch mechanisms 40 and 40A are provided with the biasing members 90 and 90A, the biasing members 90 and 90A need only be provided so as to be able to return the operating portion 60 and the second housing 15A to the reference positions. The configuration for supporting the biasing members 90 and 90A is not limited to the configuration of the above embodiments. Further, the biasing members 90 and 90A are not limited to compression coil springs, and may be other coil springs or plate springs.

In the second embodiment, the upper surfaces 131A and 151A of the outer surfaces that define the outlines of the first housing 13A and the second housing 15A are generally parallel at all times, and the upper surfaces 131A and 151A appear continuously. was On the other hand, the switch mechanism 40A and the grinder 1A may be configured such that the pattern or shape on 13A is always continuous with the pattern or shape on 15A.

In the switch mechanism 40 of the first embodiment, the operation convex portion 62, the first groove portion 131, and the second groove portion 132 function as a lock-on mechanism that locks the motor 2 in the ON state. Similarly, the switch mechanism 40A of the second embodiment may also include a lock-on mechanism capable of fixing the second housing 15A in the first position and fixing the second housing 15A in the second position.

The grinders 1 and 1A may have a mounting portion to which a battery pack can be mounted. Electric power may be supplied to the motor 2 from the battery pack.

A whetstone, a rubber pad, a brush, a blade, or the like may be used as a tip tool that can be attached to the grinders 1 and 1A. Moreover, the switch mechanisms 40 and 40A are not limited to the grinders 1 and 1A. It is applicable to power tools that drive

The present disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in the respective modes described in the Summary of the Invention column may be used to solve some or all of the above problems, or Substitutions and combinations may be made as appropriate to achieve part or all. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

1... Grinder 1A... Grinder 2... Motor 3... Spindle 10... Housing 10A... Housing 11... Spindle housing 13... First housing 13A... First housing 14A... Extension member 15...Second housing 15A...Second housing 16A...Open part 18...Wheel cover 19...Power cord 21...Motor body 23...Motor Shaft 24...Small bevel gear 27...Fan 31...Tool mounting part 33...Large bevel gear 40...Switch mechanism 40A...Switch mechanism 50...Micro switch 50A...Micro switch 51 ...Switch case 51A...Switch case 52...Detector 52A...Detector 53...Switch lever 53A...Switch lever 60...Operation part 61...Main operation part 62. .. Operation convex portion 63... Connecting portion 70... Intermediate member 71... Arm portion 80... Link portion 81... Opening portion 90... Biasing member 90A... Biasing member 91 ...tip tool 93A...first end 94A...second end 131...first groove 131A...upper surface 132...second groove 133...opening 139...reference Wall 141... Supporting part 141A... Recess 142... Supporting part 143A... First end 144A... Second end 151A... Upper surface 152A... Inner wall 161A... Upper surface 171A ... Recess 173A... First end 174A... Second end 181A... Pushing part 182A... Pushing part 183A... Inclined surface 531... First end 531A... First end 532 Second end 532A Second end 533 Inclined surface 533A Inclined surface 611 Lower surface 711 Opening 721 Projection 722. .. Protruding part 811... Upper surface 821... Pushing part 822... Pushing part 823... Inclined surface P... Broken line R, R1... Plane Q... Plane R1... Plane A0 ...Long axis A1...Spindle rotation axis A2...Motor rotation axis

Claims (14)

A switch mechanism provided in an electric working device driven by a motor housed in a housing,
a switch housed in the housing that supplies power to the motor in an ON state and stops power supply to the motor in an OFF state;
The switch is movable in a first direction and a second direction opposite to the first direction with respect to a reference position, holds the switch in the off state when positioned at the reference position, and moves with respect to the reference position. configured to hold the switch in the ON state when positioned at a first position in the first direction and when positioned at a second position in the second direction relative to the reference position; an operation unit,
switch mechanism. 2. The switch mechanism of claim 1, further comprising:
A switch mechanism comprising a biasing member that biases the operating portion to return from the first position to the reference position and from the second position to the reference position. A switch mechanism according to claim 1 or claim 2,
The switch mechanism, wherein the first direction and the second direction are directions along the longitudinal direction of the housing. 4. The switch mechanism of claim 3, further comprising:
an intermediate member accommodated in the housing and interlocking with the operating portion, the intermediate member extending along the longitudinal direction and turning on the switch when the operating portion is at the first position and the second position; and an intermediate member that holds the switch in the off state when the operating portion is in the reference position. A switch mechanism according to claim 4,
The switch is
the switch body,
a switch lever extending in the longitudinal direction, having a first end configured as a free end and having a second end located in the second direction with respect to the first end connected to the switch body;
The intermediate member is
an opening facing the switch and recessed in a direction away from the switch;
a pushing portion provided opposite to the switch and positioned in the first direction and the second direction with respect to the opening;
The switch body holds the switch in the ON state when the switch lever is pushed toward the switch body, and turns the switch OFF when the switch lever is released from being pushed into the switch body. is configured to hold state,
The intermediate member opens the switch lever toward the opening portion when the operation portion is at the reference position, and opens the switch lever when the operation portion moves to the first position and the second position. A switch mechanism configured to be pushed by a pushing portion. A switch mechanism according to claim 5, wherein
The housing includes a first housing that houses the motor and a second housing positioned in the second direction with respect to the first housing,
The switch is housed in the second housing,
at least a portion of the operation portion is exposed from an opening provided in the first housing;
The intermediate member is
an arm portion connected to the operation portion and extending from inside the first housing to inside the second housing;
A link portion that is connected to the end portion of the arm portion in the second direction, is accommodated in the second housing, and is provided facing the switch, the link portion having the open portion and the push-in portion. and a switch mechanism. A switch mechanism according to any one of claims 1 to 6,
The housing is provided with a first groove portion for positioning the operating portion moved to the first position and a second groove portion for positioning the operating portion moved to the second position. ,
The switch mechanism, wherein the operation portion includes an operation convex portion that can be engaged with the first groove portion and the second groove portion. A switch mechanism according to claim 1 or claim 2,
The switch mechanism, wherein the first direction and the second direction are directions along a circumferential direction around a longitudinal direction of the housing. A switch mechanism according to claim 8, wherein
the housing comprises a first housing and a second housing connected in the longitudinal direction of the housing;
the second housing is rotatable relative to the first housing along the circumferential direction and functions as the operating portion;
A switch mechanism, wherein the switch is supported by an extension member fixed to the first housing and extending from the first housing into the second housing and housed in the second housing. A switch mechanism according to claim 9, wherein
The switch is
the switch body,
a switch lever extending in a width direction intersecting the longitudinal direction, having a first end configured as a free end, and having a second end in the second direction with respect to the first end connected to the switch body; , and
The second housing is
an opening facing the switch and recessed in a direction away from the switch;
a pushing portion provided opposite to the switch and positioned in the first direction and the second direction with respect to the opening;
The switch body holds the switch in the ON state when the switch lever is pushed toward the switch body, and turns the switch OFF when the switch lever is released from being pushed into the switch body. is configured to hold state,
The second housing is configured to open the switch lever toward the open portion when it is at the reference position, and to push the switch lever by the pushing portion when it moves to the first position and the second position. switch mechanism. A switch mechanism according to claim 10, wherein
The first portion on the outer surface of the first housing and the second portion on the outer surface of the second housing are
continuous in the longitudinal direction when the second housing is positioned at the reference position;
A switch mechanism that is discontinuous in the longitudinal direction when the second housing is positioned in the first position and when the second housing is positioned in the second position. A switch mechanism according to claim 5 or 10,
At least one of a connecting portion between the open portion and the pushing portion located in the first direction and the first end portion of the switch lever includes the longitudinal axis of the housing and intersects the longitudinal direction. A switch mechanism, which is an inclined surface inclined from the second direction toward the first direction so as to approach a surface parallel to the width direction. An electric working machine, comprising: the switch mechanism according to any one of claims 1 to 12; and the motor accommodated in the housing, and driven by the motor. The electric working machine according to claim 13,
a spindle having one end projecting from the housing and rotated by being driven by the motor;
a tip tool attached to the spindle,
An electric working device that can use a grinding wheel as the tip tool and that functions as a grinder.

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