JP6803157B2 - Electric tool - Google Patents

Description

The present disclosure relates to a power tool in which a motor is housed in a housing having a tubular grip portion that can be gripped by a user.

In electric tools such as grinders and reciprocating saws, a part of the housing in which the motor is housed is usually formed into a tubular shape that can be grasped by the user so that the user can hold and operate the housing of the electric tool. Has been done.

Further, in this power tool, when the user grips the grip portion, the switch in the housing can be turned on / off to switch between driving and stopping the motor. An operation unit is provided for the user to perform a pulling operation with a finger (see, for example, Patent Document 1).

This operation unit is composed of a long member having one end rotatably supported on the front end side or the rear end side in the central axial direction of the grip portion that can be gripped by the user and the other end being open. Has been done. In this specification, this kind of operation unit is referred to as a paddle switch.

Therefore, the user can push the paddle switch into the housing and turn on the switch by gripping the paddle switch when gripping the grip portion.
Further, the paddle switch described in Patent Document 1 is engaged with the paddle switch at a reference position before the pulling operation so that the user does not carelessly pull the operation, and the switch in the housing is turned off. A lock-off mechanism for holding the state is provided.

Japanese Unexamined Patent Publication No. 2013-022702

By the way, the paddle switch described above can swing around the axis by pivotally supporting one end to the housing, and when the switch in the housing is held in the off state by the lock-off mechanism, the other end is , Protruding from the outer surface of the housing.

Therefore, if the length of the paddle switch is increased so that the paddle switch can be operated over the entire grip portion of the housing (in other words, in order to improve operability), the amount of protrusion from the outer surface of the housing increases.

Further, when the paddle switch is pulled and operated, it is necessary to insert the portion protruding from the outer surface of the housing into the housing, so that the grip portion of the housing becomes thick.
Therefore, in order to configure the operation unit with a paddle switch and improve its operability, there is a problem that the power tool becomes large and it is difficult to reduce the size of the power tool.

Further, when using the power tool, the user grips the grip portion at an arbitrary position where the work material can be easily machined, and the paddle switch has a force required for pulling operation according to the grip position. (In other words, the load) changes.

When the force required to pull and operate the paddle switch changes in this way, some users may feel that it is not easy to use.
In particular, if the power tool is configured to drive the motor only when the paddle switch is being pulled, the paddle switch must continue to operate in order to drive the motor. If the load during operation changes, the usability of such a power tool deteriorates.

One aspect of the present disclosure is an object of an electric tool in which a motor or a switch for driving a motor is housed in a housing, so that the user can easily operate the switch while holding the housing.

In the power tool of one aspect of the present disclosure, a motor, a switch for energizing the motor, a housing having a tubular grip portion that can be gripped by the user, and the motor and the switch are housed therein. To be equipped.

The grip portion of the housing is provided with a displaceable operation portion. This operation unit is for switching the switch from the off state to the on state by moving from the reference position to the operation position by an external operation.

Further, the operation portion constitutes a part of the outer surface of the grip portion. Then, the operation unit can be moved from the reference position to the operation position by an external operation, and the switch can be switched from the off state to the on state by the movement. Further, when the external operation is stopped, the operation unit returns to the reference position and returns the switch to the off state.

As described above, in the power tool of one aspect of the present disclosure, the operation portion constitutes a part of the outer surface of the grip portion, and the operation portion moves from the reference position to the operation position by the operation by the user, thereby forming the inside of the housing. Toggle the switch from off to on.

Therefore, unlike the case where the operation unit is configured by the paddle switch described above, it is not necessary to project the operation unit from the outer surface of the grip portion, and the grip portion can be made thinner to reduce the size of the entire power tool. it can.

Further, since the operation unit constitutes a part of the outer surface of the grip portion, the load applied to the operation unit to turn on the switch is almost constant regardless of the position of the grip portion, and the user grips the grip portion. It is possible to prevent the operability from being lowered depending on the gripping position where the portion is gripped.

Further, when the external operation is stopped, the operation unit returns to the reference position and switches the switch to the off state.
Therefore, the user can stop the driving of the motor simply by stopping the operation of the operation unit, and suppresses the motor from being continuously driven even though the user stops the operation of the operation unit. it can. That is, it is possible to suppress the rotation of the motor against the intention of the user, and it is possible to improve the usability of the power tool.

Here, the power tool is provided with a lock-off mechanism configured to fix the operation unit at the reference position, hold the switch in the off state, and release the fixation of the operation unit to the reference position by an external operation. You may.

Further, this lock-off mechanism may be configured to automatically fix the operation unit at the reference position when the operation unit returns from the operation position to the reference position without external operation.
When the lock-off mechanism is configured in this way, it is possible to better suppress the operation unit from moving, the switch being turned on, and the motor being driven against the intention of the user.

Next, the operating portion may be configured to be displaceable in the direction of the central axis of the grip portion. In this way, the operation unit can be moved (sliding) in the direction of the central axis of the housing along the outer surface of the housing, and the user can slide the operation unit to turn off the switch. You can switch from state to on state.

Further, in this case, the lock-off mechanism is provided in the housing so as to be swingable around an axis orthogonal to the displacement direction of the operation portion, and is configured to fix the operation portion at a predetermined swing position at a reference position. May be good.

In this way, the user releases the fixing of the operating portion to the reference position by swinging the lock-off mechanism from the outside of the housing while gripping the grip portion, and then the operating portion is released. The switch can be turned on by operating the slide.

Therefore, the user can easily perform the operation at the time of driving the motor with the hand holding the grip portion.
Further, when the operating portion is configured to be displaceable in the central axis direction of the grip portion, an intermediate member may be provided between the movable portion of the switch and the operating portion in the housing. That is, when the operation unit moves to the operation position, the intermediate member presses the movable part of the switch to switch the switch from the off state to the on state.

If an intermediate member is provided between the switch and the operation unit in this way, when the operation unit moves from the reference position to the operation position, the movable portion of the switch is pressed in the moving direction via the intermediate member. It is possible to change the operation direction required to turn it on.

Therefore, the direction of the switch in the housing can be arbitrarily set without being restricted by the moving direction of the operation unit, and the degree of freedom in design can be increased.
Next, the lock-off mechanism may be provided on the grip portion so as to be rotatable around the central axis of the grip portion, and may be configured to fix the operation portion at a reference position at a predetermined rotation position.

In this way, the lock-off mechanism is rotated around the central axis of the grip portion to release the fixing of the operation unit to the reference position, and the operation unit is moved from the reference position to the operation position by an external operation. Will be able to.

In this case, the operating portion may be configured to be displaceable inside the grip portion when the lock-off mechanism is rotated and the fixing to the reference position is released. In this way, by gripping the grip portion, the user can displace the operation portion inside the grip portion and directly press the movable portion of the switch in the housing.

When the lock-off mechanism is rotated around the central axis of the grip portion to release the fixing of the operating portion to the reference position, the operating portion is configured to be displaceable in the central axis direction of the grip portion. It may have been done.

Further, the power tool of one aspect of the present disclosure may be configured to drive the motor with the power supplied from an AC power source such as a commercial power source when the switch is on, or may be attached to the housing. The motor may be driven by the power supplied from the battery.

Furthermore, in the power tool of one aspect of the present disclosure, the operation portion is arranged long so as to crawl on the outer surface of the grip portion, and the load required for the external operation is constant regardless of the position of the operation portion. It may be configured to be.

Further, the operating portion may be arranged so as to crawl on the outer surface of the grip portion for a long time, and the entire operating portion may be displaced by the same amount of movement by an external operation.
That is, even if the operating portion is configured in this way, it is not necessary for the operating portion to protrude from the outer surface of the grip portion, and the grip portion can be made thinner to reduce the size of the entire power tool. Further, regardless of the position of the grip portion, the entire operation portion is displaced by the same amount of movement, and the load applied to the operation portion to turn on the switch is constant. Therefore, the grip portion is gripped. It is possible to suppress the deterioration of operability depending on the position.

It is a perspective view which shows the appearance of the grinder of 1st Embodiment seen from above. It is sectional drawing which shows the appearance of the grinder of 1st Embodiment seen from the bottom. It is sectional drawing which shows the internal structure of the grinder of 1st Embodiment. It is a perspective view which shows the structure of the operation part, the lock-off mechanism and the intermediate member shown in FIG. FIG. 3 is a cross-sectional view showing a state in which the operation unit is released from being fixed by the lock-off mechanism. FIG. 5 is a cross-sectional view showing a state in which the operation unit is operated and moved to the operation position in FIG. It is sectional drawing which shows the internal structure of the grinder of 2nd Embodiment. FIG. 7 is a cross-sectional view showing a state in which the operation unit is released from being fixed by the lock-off mechanism in FIG. 7. FIG. 8 is a cross-sectional view showing a state in which the operation unit is operated and moved to the operation position in FIG. It is sectional drawing which shows the internal structure of the grinder of 3rd Embodiment. FIG. 10 is a cross-sectional view showing a state in which the operation unit is released from being fixed by the lock-off mechanism in FIG. 11 is a cross-sectional view showing a state in which the operation unit is operated and moved to the operation position in FIG. 11. It is sectional drawing which shows the internal structure of the grinder of 4th Embodiment. 14A is a sectional view taken along line XIVA-XIVA shown in FIG. 13, and FIG. 14B is a sectional view taken along line XIVB-XIVB shown in FIG. 15A and 15B are cross-sectional views showing a state in which the operation unit is released from the lock-off mechanism in FIGS. 14A and 14B, respectively. 16A and 16B are cross-sectional views showing a state in which the operation unit is operated and moved to the operation position in FIGS. 15A and 15B, respectively. It is sectional drawing which shows the internal structure of the grinder of 5th Embodiment. 18A is a sectional view taken along line XVIIIA-XVIIIA shown in FIG. 17, FIG. 18B is a sectional view taken along line XVIIIB-XVIIIB shown in FIG. 17, and FIG. 18C is a sectional view taken along line XVIIIC-XVIIIC shown in FIG. FIG. 17 is a cross-sectional view showing a state in which the operation unit is operated and moved to the operation position in FIG. 20A is a sectional view taken along line XXA-XXA shown in FIG. 19, FIG. 20B is a sectional view taken along line XXB-XXB shown on FIG. 19, and FIG. 20C is a sectional view taken along line XXC-XXC shown on FIG. It is a perspective view which shows the appearance of a rechargeable grinder.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, as the power tool of the present disclosure, a grinder that grinds, polishes, cuts, and the like on the work material will be described as an example.
[First Embodiment]
As shown in FIGS. 1 and 2, the grinder 2 of the present embodiment is mainly composed of a motor housing 4, a gear housing 6, a rear housing 8, and a wheel cover 10.

The motor housing 4 has a cylindrical shape having an outer diameter that can be grasped by the user with one hand, and as shown in FIG. 3, the motor 12 is housed therein.
The motor 12 is arranged in the motor housing 4 so that the rotating shaft 14 of the motor 12 is parallel to the central axis of the motor housing 4 and substantially coincides with the rotating shaft 14 of the motor 12 toward the gear housing 6. It is protruding.

The rear housing 8 has a substantially cylindrical shape like the motor housing 4, and is provided on one end side (specifically, the side opposite to the gear housing 6) of the central axis of the motor housing 4. Further, the power supply wiring portion 16 is housed in the rear housing 8.

In the following description, the gear housing 6 side of the central shaft of the gear housing 6 (in other words, the rotating shaft 14 of the motor 12) is referred to as the front, and the rear housing side is referred to as the rear.
The power supply wiring unit 16 is energized with a power cord 18 for projecting from the rear of the rear housing 8 to receive power supply from an external AC power supply (commercial power supply) and a motor 12 with power supplied from the power cord 18. A switch 50 for this is provided. The switch 50 is turned on and off via an operation unit 40 operated by the user.

As shown in FIG. 2, the operation unit 40 has a long shape, and the central axial direction of the motor housing 4 and the rear housing 8 is the longitudinal direction so as to form a part of the outer surfaces of the motor housing 4 and the rear housing 8. It is provided so as to be.

Further, the operation unit 40 can be moved in the central axial direction of the motor housing 4 and the rear housing 8 (in other words, the longitudinal direction of the operation unit 40), and is on the front side of the grinder 2 when not operated by the user. It is arranged at the reference position (see FIGS. 2 and 3).

Further, when the user moves the operation unit 40 to the operation position (see FIG. 6) on the rear side of the grinder 2, the operation unit 40 switches the switch 50 from the off state to the on state. Then, the motor 12 is energized and rotates when the switch 50 is in the ON state.

The configuration for switching the on / off state of the switch 50 by the operation of the operation unit 40 by the user is the main part of the present disclosure, and will be described in detail later.
Next, the gear housing 6 is provided on the side opposite to the rear housing 8 of the motor housing 4 (that is, the front side of the grinder 2), and the first bevel gear 20, the second bevel gear 22, the spindle 24, the bearings 26, 28 and the like are provided. It is housed.

The first bevel gear 20 is fixed to the rotating shaft 14 of the motor 12 in the gear housing 6. The second bevel gear 22, the spindle 24, the bearings 26, and 28 are integrally provided in the inner housing 30 which is formed separately from the gear housing 6, and the inner housing 30 is fitted and fixed in the gear housing 6. As a result, it is housed in the gear housing 6.

The inner housing 30 is provided with a rotatably spindle 24 via a bearing 26. The inner housing 30 has a cylindrical shape coaxial with the central axis of the spindle 24, and is fixed in the gear housing 6 so that the spindle 24 is orthogonal to the rotation axis 14 of the motor 12.

The second bevel gear 22 is fixed to the spindle 24 and meshes with the first bevel gear 20 in the gear housing 6 to convert the rotational output of the motor 12 into the rotational force around the axis of the spindle 24.

One end of the spindle 24 is rotatably supported by the gear housing 6 via a bearing 28, and the other end of the spindle 24 projects outward (downward) from the internal housing 30 (in other words, the gear housing 6). Has been done.

An inner flange 32 for positioning and fixing the disc-shaped tip tool 36 is provided on the protruding portion of the spindle 24 from the gear housing 6. Further, a threaded portion 25 for screwing the lock nut 34 is formed on the outer peripheral portion of the tip of the spindle 24 further than the inner flange 32. The lock nut 34 is for sandwiching the tip tool 36 with the inner flange 32.

In the grinder 2 configured in this way, when the switch 50 is turned on, the motor 12 rotates, and the rotational output thereof is transmitted via the gear mechanism (first bevel gear 20, second bevel gear 22) in the gear housing 6. It is transmitted to the spindle 24.

Therefore, if the tip tool 36 is fixed to the spindle 24 via the lock nut 34, the tip tool 36 can rotate to perform operations such as grinding, polishing, and cutting.
Examples of the tip tool 36 used in the grinder 2 include a grinding wheel, a cutting wheel, a wire brush, and the like.

Further, the gear housing 6 is provided with a detachable handle portion 9 for the user to grip when using the grinder 2.
Next, the wheel cover 10 is for protecting the user from scattering of the work material and the fragments of the tip tool 36 that occur during operations such as grinding, polishing, and cutting.

Therefore, the wheel cover 10 is formed in a substantially semicircular shape so as to cover a part (approximately half in this embodiment) of the tip tool 36 fixed to the spindle 24 from the gear housing 6 side.

The wheel cover 10 is fixed to a portion of the inner housing 30 where the spindle 24 protrudes.
That is, in the internal housing 30, the mounting portion 31 for mounting the wheel cover 10 has a cylindrical shape so as to surround the spindle 24 coaxially with the central axis of the spindle 24.

Further, in the wheel cover 10, the outer periphery of the mounting portion 31 of the inner housing 30 is located at the center of the semicircular plate surface arranged on the inner housing 30 side of the tip tool 36 so as to face the plate surface of the tip tool 36. A mounting portion 37 for fixing the wheel is provided.

The mounting portion 37 has a ring shape that can be fitted externally to the mounting portion 31 of the internal housing 30, and a part of the ring is opened so that the mounting portion 37 can be tightened and fixed around the mounting portion 31 by the fastener 38. It has become. Since the configuration of the mounting portion 37 is common in grinders, the details thereof will be omitted.

In the grinder 2 configured in this way, the wheel cover 10 can be detachably attached to the internal housing 30. Further, the wheel cover 10 can be rotated around the spindle 24 by loosening the tightening of the internal housing 30 by the mounting portion 37 to protect the tip tool 36 which can be protected by the plate surface of the semicircular wheel cover 10. You can change the area.

The reason why the protected area can be changed in this way is that the area where the tip tool 36 should be exposed differs from the grinder 2 depending on the application (grinding, polishing, cutting) of the tip tool 36, and the user can work. The position of the wheel cover 10 can be changed according to the contents.

Next, a configuration for switching the on / off state of the switch 50 by the operation unit 40 will be described.
As shown in FIGS. 3 and 4, the length of the operating portion 40 in the longitudinal direction is set to a length that can be operated even if the user changes the gripping position in the motor housing 4 and the rear housing 8.

That is, in the motor housing 4 and the rear housing 8, substantially the entire outer circumference around the central axis is a grip portion that can be gripped by the user, and the operation portion 40 is such that the user grips the grip portion. It can be operated.

Further, the upper surface of the operation unit 40 is opened by a plate surface for forming a part of the outer surface of both housings 4 and 8 and a frame portion erected from the outer peripheral edge of the plate surface toward the inside of the housing. It has a flat box shape. The motor housing 4 and the rear housing 8 are provided with openings that support the operation unit 40 so as to be displaceable in the central axis direction.

In the operation unit 40, the rear frame portion arranged on the rear housing 8 side is provided with two pins 44, 48 at predetermined intervals along the longitudinal direction of the operation unit 40. The two pins 44 and 48 are arranged so as to be orthogonal to the longitudinal direction of the operation unit 40 (in other words, the direction of the central axis of the rear housing 8), and the pin 44 on the front side has the pin 44. A swing member 42 that can swing around the center is provided.

The main body of the swing member 42 protrudes from the pin 44 to the rear side of the grinder 2, and is inserted into the L-shaped guide holes 56 provided in the rear housing 8 on both sides of the tip thereof. A protrusion 46 for displaceably fixing the operating portion 40 to the rear housing 8 is provided.

The guide hole 56 is L-shaped due to a straight portion that movably supports the protrusion 46 along the central axis of the rear housing 8 and a bent portion that is bent toward the inside of the rear housing 8 on the front side of the straight portion. It is formed in a shape.

Further, the main body portion of the swing member 42 is urged toward the inside of the rear housing 8 by the urging force of the torsion coil spring 45 wound around the pin 44. Further, the rear housing 8 is provided with a compression coil spring 54 for urging the operation unit 40 from the rear side to the front side of the rear housing 8.

Therefore, when the operation unit 40 is not operated by the user, the operation unit 40 is fixed to the reference position on the front side of the grinder 2 by the urging force of the compression coil spring 54. Then, in this state, the protrusion 46 of the swing member 42 enters the bent portion of the guide hole 56, and the movement of the operating portion 40 to the rear side is prevented.

In this state, the operation unit 40 can be prohibited from moving to the operation position and the switch 50 can be held in the off state. Therefore, in the present embodiment, the swing member 42 and the guide hole 56 are locked. It will function as an off mechanism.

Further, in this state, when the swing member 42 is rotated against the urging force of the torsion coil spring 45, the protrusion 46 of the swing member 42 moves to the straight portion of the guide hole 56, and the protrusion 46 and the guide hole The engagement with the 56 (in other words, the fixing of the operation unit 40 to the reference position) is released.

Then, in order to allow the user to perform this release by an external operation, the swing member 42 is integrally provided with an operating projecting piece 43 projecting from the pin 44 toward the front and outer sides of the rear housing 8. It is formed.

As shown in FIG. 5, the projecting piece 43 is operated by the user pushing the operating portion 40 from the outside to the inside to rotate the swing member 42 against the urging force of the torsion coil spring 45. This is for releasing the fixing of the unit 40 to the reference position so that the operation unit 40 can be operated.

Therefore, in the operation unit 40, the plate surface forming the outer surface of the housings 4 and 8 is provided with an opening 41 for projecting the tip end portion of the projecting piece 43 to the outside of the housings 4 and 8.

Next, in the rear housing 8, the switch 50 is provided so that the movable portion 51 for turning on / off the contacts faces the operating portion 40. Then, the movable portion 51 of the switch 50 and the operating portion 40 are displaced in a direction orthogonal to the moving direction (in other words, the operating direction of the operating unit 40) due to the rearward movement of the operating unit 40. An intermediate member 52 for switching the switch 50 from the off state to the on state is provided.

The intermediate member 52 is a rectangular plate-shaped member whose plate surface is curved outward along the central axis of the rear housing 8, and the intermediate member 52 is swingably supported on the front end edge of the rear housing 8. A support shaft 53 is provided for this purpose.

The support shaft 53 is inserted into the support hole 58 provided in the rear housing 8 so as to be substantially parallel to the pin 48 of the operation unit 40. Further, the plate surface of the intermediate member 52 on the operation portion 40 side is in contact with the pin 48.

Therefore, as shown in FIG. 6, when the operation unit 40 is operated and the pin 48 moves rearward, the intermediate member 52 is pushed up inside the rear housing 8 about the support shaft 53. As a result, the movable portion 51 of the switch 50 is pressed by the intermediate member 52, and the switch 50 is turned on.

That is, in the present embodiment, since the switch 50 is arranged so that the operation direction of the switch 50 is orthogonal to the movement direction of the operation unit 40, the intermediate member 52 operates the switch 50 in the movement direction of the operation unit 40. Convert to the direction and turn on the switch 50.

As described above, in the grinder 2 of the present embodiment, the operation portion 40 for turning on / off the switch 50 is one of the outer surfaces of the motor housing 4 and the rear housing 8 which are grip portions that can be gripped by the user. It constitutes a part.

Further, the operation unit 40 has a long shape so that the user can operate it with a constant load no matter where the motor housing 4 or the rear housing 8 is gripped, and the operation unit 40 is operated by an external operation by the user. The entire 40 moves in the central axis direction of the housings 4 and 8 with the same amount of movement.

The operation unit 40 is usually fixed at a reference position by engaging the swing member 42 constituting the lock-off mechanism with the guide hole 56, and the user pushes the projecting piece 43 of the swing member 42. The fixing is released, and the operation unit 40 can be operated.

In this state, when the operation unit 40 is operated and moves to the rear operation position, the switch 50 is switched from the off state to the on state via the intermediate member 52, and the energization of the motor 12 is started.

Therefore, the user can operate the operation unit 40 while grasping the desired positions of the motor housing 4 and the rear housing 8. Further, this operation only needs to move the operation unit 40 rearward against the urging force of the compression coil spring 54, and the force required for the operation becomes constant even if the gripping position changes.

Therefore, according to the grinder 2 of the present embodiment, the force required for operating the operation unit changes depending on the gripping positions of the motor housing 4 and the rear housing 8 as in the case where the operation unit is configured by the paddle switch described above. However, it is possible to prevent the operation from becoming difficult.

Further, unlike the paddle switch described above, the operation unit 40 does not need to project outward from the outer peripheral surfaces of the motor housing 4 and the rear housing 8, so that each of the housings 4 and 8 is thinned to reduce the entire grinder 2. Can be miniaturized.

Further, when the user stops the operation, the operation unit 40 returns to the reference position by the urging force of the compression coil spring 54. In this state, if the user has not pushed the projecting piece 43 of the swing member 42, the swing member 42 is rotated by the urging force of the torsion coil spring 45, and the operation unit 40 is in the reference position. Is fixed to.

Therefore, the user can switch the switch 50 to the off state and stop the driving of the motor 12 simply by stopping the operation of the operation unit 40, and can maintain that state. Therefore, according to the grinder 2 of the present embodiment, it is possible to suppress the rotation of the motor 12 against the intention of the user, and it is possible to improve the usability of the grinder 2.

Further, an intermediate member 52 that swings due to the displacement of the operation unit 40 is provided between the operation unit 40 and the switch 50. Therefore, according to the grinder 2 of the present embodiment, the backward movement of the operation unit 40 by the operation of the user is changed by the intermediate member 52 in the direction orthogonal to the movement direction, and the movable portion of the switch 50 is changed. 51 can be pressed.

Therefore, the arrangement direction of the switch 50 in the rear housing 8 can be arbitrarily set without corresponding to the operation direction of the operation unit 40, and the degree of freedom in design can be increased.
[Second Embodiment]
As shown in FIG. 7, the grinder 2A of the second embodiment has the same basic configuration as the grinder 2 of the first embodiment, and is different from the grinder 2 of the first embodiment in that the switch 50 is turned on and off. It is a configuration of an operation unit 40A and a lock-off mechanism.

Therefore, in the present embodiment, the points different from the grinder 2 of the first embodiment will be described, and the same reference numerals as those of the first embodiment will be given to the drawings for other parts, and the description thereof will be omitted.
Like the operation unit 40 of the first embodiment, the operation unit 40A of the present embodiment has a long shape so that the user can operate the motor housing 4 and the rear housing 8 regardless of the position of the operation unit 40. ..

Therefore, the motor housing 4 and the rear housing 8 are provided with an opening for displaceably supporting the operation portion 40A, and the operation portion 40A is attached so as to close the opening.

Further, the switch 50 provided in the rear housing 8 is arranged so that the movable portion 51 faces rearward, and the movable portion 51 is moved to the rear end portion of the operation portion 40A by moving the operation portion 40A forward. A plate-shaped protrusion 49A for directly pressing is provided.

The operation unit 40A is usually arranged at a reference position by urging the protrusion 49A from the movable portion 51 of the switch 50 in the direction in which the switch 50 is turned off (that is, the rear side of the grinder 2). Further, the operation unit 40A is provided with a swing member 42A for fixing the operation unit 40A at this reference position.

That is, the operation unit 40A has a flat box shape with an open upper surface, similar to the operation unit 40 of the first embodiment. Further, the swing member 42A is provided with a support shaft 44A so as to project so as to be orthogonal to the longitudinal direction of the operation portion 40A. The swing member 42A is swingably attached to the operation portion 40A by inserting the support shaft 44A into a support hole (not shown) provided in the frame portion of the operation portion 40A.

Further, the swing member 42A is provided with projecting pieces 43A and 47A for operation and fixing. The operating protrusion 43A projects outward from the opening 41A provided in the operating portion 40A when the operating portion 40A is in the reference position, and the fixing protrusion 47A has the operating portion 40A in the reference position. Occasionally, it comes into contact with the protrusion 57A provided on the case of the motor 12.

Further, around the support shaft 44A of the swing member 42A, a torsion coil spring 45A for urging the projecting piece 47A to the case side of the motor 12 (in other words, the inside of the rear housing 8) is provided.

Therefore, the operation unit 40A is not only arranged at the reference position by the urging force from the movable portion 51 of the switch 50 in the normal state when the user is not operating, but also the protrusion 47A of the swing member 42A is a motor. It is fixed at the reference position by being brought into contact with the protrusion 57A of the twelve.

As a result, the switch 50 is locked to the off state, and the user cannot operate the operation unit 40A to switch the switch 50 to the on state.
On the other hand, in this state, when the projecting piece 43A of the swing member 42A is operated to rotate the swing member 42A against the urging force of the torsion coil spring 45A, the swing member is as shown in FIG. The protrusion 47A of the 42A and the protrusion 57A of the motor 12 are disengaged.

In this state, as shown in FIG. 9, the user can move the operation unit 40A to the front of the grinder 2A, and by the movement, the movable part of the switch 50 is pressed via the protrusion 49A. , The switch 50 can be switched from the off state to the on state.

Therefore, according to the grinder 2A of the present embodiment, the user can switch the switch 50 to the on state and rotate the motor 12 in substantially the same operation as the grinder 2 of the first embodiment. The same effect as that of one embodiment can be obtained.

Further, the grinder 2A of the present embodiment is configured such that the movable portion 51 of the switch 50 is directly pressed by the protrusion 49A of the operation portion 40A without providing the intermediate member 52 between the operation portion 40A and the switch 50. .. Therefore, the number of parts can be reduced as compared with the first embodiment.

In the present embodiment, the operation unit 40A has been described as moving to the reference position by the urging force from the movable portion 51 of the switch 50, but the urging force from the urging member such as the compression coil spring 54 is used. The operation unit 40A may be moved to the reference position.
[Third Embodiment]
As shown in FIG. 10, the grinder 2B of the third embodiment has the same basic configuration as the grinder 2A of the second embodiment, and is different from the grinder 2A of the second embodiment in the arrangement of the switch 50 and the operation unit. The operation direction is 40B. Therefore, in the present embodiment, the differences from the second embodiment will be described, and the description of other parts will be omitted.

As shown in FIG. 10, in the present embodiment, the switch 50 is provided in the rear housing 8 so that the movable portion 51 faces the front of the grinder 2B. The operation unit 40B has a long shape like the operation unit 40A of the second embodiment, and forms a part of the outer surface of the motor housing 4 and the rear housing 8.

Further, the operation unit 40B can be displaced along the central axis of the motor housing 4 and the rear housing 8, but in the present embodiment, the protrusion 49B provided on the rear end side of the operation unit 40B causes the operation unit 40B to be rearward from the reference position. The switch 50 is turned on by moving to.

That is, when the operation portion 40B is not operated, the protrusion 49B moves forward by the urging force from the movable portion 51 of the switch 50 and is held at the reference position, and the operation portion 40B is moved backward from the reference position by an external operation. The movable portion 51 is pressed by moving to. Then, when it is moved to a predetermined operation position, the switch 50 is turned on.

Further, the operation unit 40B is provided with a swing member 42B having the same configuration as the swing member 42A of the second embodiment. The swing member 42B includes projecting pieces 43B and 47B for operation and fixing, and is attached to the operation unit 40B in the direction opposite to that of the second embodiment via the support shaft 44B. Further, the swing member 42B is urged in the direction opposite to that of the second embodiment by a torsion coil spring 45B provided around the support shaft 44B.

Then, the operating protrusion 43B protrudes outward from the opening 41B provided in the operating portion 40B when the operating portion 40B is in the reference position, and the fixing protrusion 47B has the operating portion 40B in the reference position. At the time of, the motor 12 is brought into contact with the protrusion 57B provided on the case.

Therefore, the operating portion 40A is normally arranged at the reference position by the urging force from the movable portion 51 of the switch 50 when the user is not operating, and the projecting piece 47B of the swinging member 42B is the protrusion 57B of the motor 12. It is fixed in the reference position by being abutted against.

Further, in this state, when the user operates the projecting piece 43B of the swing member 42B to rotate the swing member 42B against the urging force of the torsion coil spring 45B, as shown in FIG. The protrusion 47B of the swing member 42B and the protrusion 57B of the motor 12 are disengaged.

In this state, as shown in FIG. 12, the user can move the operation unit 40B to the rear of the grinder 2B, and by the movement, presses the movable part of the switch 50 via the protrusion 49B. , The switch 50 can be switched from the off state to the on state.

Therefore, also in the grinder 2B of the present embodiment, the user can switch the switch 50 to the on state and rotate the motor 12 by substantially the same operation as the grinders 2 and 2A of each of the above embodiments. The same effect as each of the above embodiments can be obtained.
[Fourth Embodiment]
As shown in FIG. 13, the grinder 2C of the fourth embodiment has the same basic configuration as the grinder 2 of the first embodiment, and is different from the grinder 2 of the first embodiment in that the switch 50 is turned on and off. It is a configuration of an operation unit 60 and a lock-off mechanism.

Therefore, in the present embodiment, the points different from the grinder 2 of the first embodiment will be described, and the same reference numerals as those of the first embodiment will be given to the drawings for other parts, and the description thereof will be omitted.
In the grinder 2C of the present embodiment, the switch 50 is in the direction in which the movable portion 51 is orthogonal to the central axis of the rear housing 8 (specifically, the lower side where the spindle 24 protrudes from the gear housing 6) as in the first embodiment. It is arranged so that it faces.

The operation unit 60 has a long shape that is long in the central axis direction of the rear housing 8, and is provided at a position on the outer peripheral surface of the rear housing 8 that faces the movable portion 51 of the switch 50.
Further, when the user grips the grip portion which is the outer peripheral surface of the motor housing 4 and the rear housing 8, the operation unit 60 rotates the operation unit 60 around the central axis of the rear housing 8 by twisting the gripped hand. It is designed to move.

That is, as shown in FIGS. 14A and 14B, the rear housing 8 is provided with an arc-shaped support hole 72 that supports the operating portion 60 so that the rear housing 8 can rotate within a predetermined angle range centered on the central axis O thereof. ing. Further, the support hole 72 is provided with a hollow support portion 62 that is inserted into the support hole 72 and can rotate around the central axis O.

The support portion 62 is composed of a plate-shaped member having an arcuate cross section, and has a hollow portion in the center of the plate surface into which the operation portion 60 can be inserted. Then, both ends of the arc are inserted into the support holes 72 provided in the rear housing 8 with the hollow portion interposed therebetween, and the support portion 62 can rotate around the central axis O of the rear housing 8.

The operation portion 60 is fixed to the rear housing 8 by being inserted into the hollow portion of the support portion 62 from the inside of the rear housing 8. Therefore, the operation unit 60 can rotate around the central axis O of the rear housing 8 integrally with the support unit 62.

Further, the operation unit 60 has a flat box shape with an open upper surface like the operation unit 40 of the first embodiment, and a flange portion 61 extending in the outer peripheral direction on the opening end side of the frame portion constituting the box. Is provided.

Therefore, when the operating portion 60 is inserted into the hollow portion of the support portion 62 from the inside of the rear housing 8, the operating portion 60 does not come off to the outside of the rear housing 8, and the rear housing 8 is inside the hollow portion of the support portion 62. Can be displaced in the radial direction orthogonal to the central axis O of.

Since the support portion 62 is inserted into the support hole 72 of the rear housing 8, the support portion 62 is not displaced in the radial direction orthogonal to the central axis O of the rear housing 8.
Further, as shown in FIGS. 13, 14B, and 15B, a compression coil spring 66 is provided at the central portion in the longitudinal direction of the operating portion 60. One end of the compression coil spring 66 is fixed to the case 76 of the motor 12, and the entire operating portion 60 is urged from the inside to the outside of the rear housing 8.

Therefore, the operation unit 60 is normally not operated by the user, but is in a state of protruding from the support portion 62 by the urging force of the compression coil spring 66, and the user operates the operation unit 60 in the rear housing by an external operation. It can be pushed into 8.

Further, on the inner surface of the operation unit 60, as shown in FIG. 15A, the operation unit 60 is rotated around the central axis O of the rear housing 8, and the center position in the rotation direction faces the movable portion 51 of the switch 50. A protrusion 63 is provided so that the movable portion 51 can be pressed when the movable portion 51 is used.

The protrusion 63 receives an urging force from a torsion coil spring 64 attached to the rear end of the case of the motor 12, so that the entire operation portion 60 is rotated from a position where the protrusion 63 faces the movable portion 51 of the switch 50. Move it.

Therefore, in the normal time when the operation unit 60 is not operated, the operation unit 60 is stopped at the rotation stop position of the support unit 62 in the support hole 72.
In this embodiment, this rotation stop position is the reference position of the operation unit 60. Further, in the support hole 72 and the support portion 62, when the operation portion 60 is rotated against the urging force of the torsion coil spring 64, the operation portion 60 is at a position where the protrusion 63 faces the movable portion 51 of the switch 50. Stop the rotation of.

As shown in FIG. 14A, when the operation unit 60 is in the reference position, the flange portion 61 located in the rotation direction of the operation unit 60 to the reference position is brought into contact with the protrusion 74 protruding from the case of the motor 12. Therefore, the operation unit 60 cannot be pushed into the rear housing 8.

As a result, the switch 50 is locked in the off state, and in the present embodiment, the protrusion 74 and the flange portion 61 function as a lock-off mechanism.
In the grinder 2C of the present embodiment configured as described above, in the normal state, the operation unit 60 is positioned at the reference position shown in FIGS. 13 and 14, and the switch 50 is fixed in a lock-off state in which the switch 50 cannot be operated.

In this state, when the user rotates the operation unit 60 against the urging force of the torsion coil spring 64 by an external operation, the lock-off state of the operation unit 60 is released and the lock-off state of the operation unit 60 is released as shown in FIG. The protrusion 63 stops at an operable position facing the movable portion 51 of the switch 50.

Therefore, if the operation unit 60 is pushed into the rear housing 8 in this state, as shown in FIG. 16A, the movable portion 51 of the switch 50 is pressed by the protrusion 63 of the operation unit 60, and the switch 50 is pressed. Turns on.

Further, in this state, the compression coil spring 66 is further compressed as shown in FIG. 16B. Therefore, if the user stops the operation of the operation unit 60, the urging force of the compression coil spring 66 and the torsion coil spring 64 causes the compression coil spring 66 to be further compressed. The operation unit 60 returns to the reference position shown in FIG. 14 and is in the lock-off state.

Therefore, according to the grinder 2C of the present embodiment, the user rotates the operation unit 60 and pushes it into the rear housing 8 while gripping the grip portion which is the outer peripheral surface of the motor housing 4 and the rear housing 8. As a result, the switch 50 can be switched to the on state.

Further, since the operation unit 60 forms a part of the outer surface of the rear housing 8 and is urged outward by the compression coil spring 66 at the central portion in the longitudinal direction thereof, the operation position of the operation unit 60 changes. Even so, the force required to turn on the switch 50 is substantially constant.

Therefore, also in the grinder 2C of the present embodiment, the operation of the operation unit 60 can be facilitated as compared with the case where the operation unit is configured by the paddle switch described above, and further, the grinders 2 and 2A of each of the above embodiments can be operated easily. , The same effect as 2B can be obtained.
[Fifth Embodiment]
As shown in FIG. 17, the grinder 2D of the fifth embodiment has the same basic configuration as the grinder 2 of the first embodiment, and is different from the grinder 2 of the first embodiment in that the switch 50 is turned on and off. It is a configuration of an operation unit 80 and a lock-off mechanism.

Therefore, in the present embodiment, the points different from the grinder 2 of the first embodiment will be described, and the same reference numerals as those of the first embodiment will be given to the drawings for other parts, and the description thereof will be omitted.
In the grinder 2D of the present embodiment, the switch 50 is arranged so that the movable portion 51 faces rearward, similarly to the grinder 2A of the second embodiment.

On the other hand, the operation unit 80 is arranged on the rear end side of the switch 50 in addition to the main body portion forming a part of the outer surface of the motor housing 4, and is a pressing unit that presses the movable unit 51 by moving the operation unit 80 forward. It has a connecting portion 83 that connects the main body portion 80 and the pressing portion 84.

The pressing portion 84 and the connecting portion 83 are integrally formed with the main body of the operating portion 80 by, for example, press molding. The entire operation unit 80 has a U-shape, and a pair of the main body portion and the connecting portion 83 are provided vertically with the central axes of the motor housing 4 and the rear housing 8 interposed therebetween.

As shown in FIGS. 18B and 18C, the motor housing 4 has an arc shape that supports the operation unit 80 so that the main body portion of the operation unit 80 can be rotated within a predetermined angle range centered on the rotation axis of the motor 12. A pair of support holes 92 are provided. Each of the operating portions 80 is provided with a flange portion 82 that is inserted into the support hole 92 and is rotatable around the central axis of the motor housing 4.

The support hole 92 of the motor housing 4 is opened to the outside within a predetermined angle range in order to regulate the rotation range of the operation unit 80, and the main body portion of the operation unit 80 is projected from the opening to form a motor. It forms a part of the outer surface of the housing 4.

The width around the rotation shaft 14 of the main body portion of the operation unit 80 is narrower than the width of the opening of the support hole 92, and the operation unit 80 can rotate by the difference in the width. Further, the width of the end 81 on the gear housing 6 side of the operation unit 80 is further narrowed, and the operation unit 80 is rotated in the motor housing 4 from the reference position in a predetermined direction (to the right in the drawing). And an insertion hole 91 into which the end portion 81 can be inserted is provided.

Therefore, in the grinder 2D of the present embodiment, the operation unit 80 is rotated from the reference position shown in FIGS. 18B and 18C as shown in FIGS. 20B and 20C, and the end portion 81 of the operation unit 80 is inserted into the insertion hole 91. The switch 50 can be turned on by inserting it into.

That is, in this way, as shown in FIG. 19, the entire operation unit 80 moves to the front of the grinder 2D. As a result, the movable portion 51 of the switch 50 is pressed by the pressing portion 84 provided at the rear end of the operating portion 80, and the switch 50 is switched from the on state to the off state.

In this embodiment, the end 81 of the operation unit 80 and the insertion hole 91 provided in the motor housing 4 function as a lock-off mechanism.
On the other hand, the connecting portion 83 of the operating portion 80 is provided so as to be displaceable with respect to the rear housing 8 in accordance with the rotation of the operating portion 80 in the motor housing 4.

Further, in the rear housing 8, as shown in FIG. 18A, the case of the motor 12 is provided with a groove through which the connecting portion 83 passes and limits its movement within the movement range between the reference position and the operation position. There is.

A compression coil spring 93 is provided in the groove to urge the connecting portion 83 (by extension, the main body portion of the operating portion 80) in the reference position direction.
Therefore, if the operation is stopped after the operation unit 80 is operated as described above, the entire operation unit 80 moves to the rear of the grinder 2D by the urging force from the movable portion 51 of the switch 50, and then the compression coil. The urging force of the spring 93 causes the main body of the operation unit 80 to return to the reference position.

As described above, according to the grinder 2D of the present embodiment, the user operates the operation unit 80 while gripping the grip portion which is the outer peripheral surface of the motor housing 4 or the rear housing 8 to operate the switch 50. Can be turned on.

Further, this operation can be easily performed by rotating the operation unit 80 around the rotation shaft 14 of the motor 12 and moving it forward.
Further, since the operation unit 80 is provided along the central axis of the motor housing 4 as a part of the outer surface of the motor housing 4, even if the operation position of the operation unit 80 changes, the operation unit 80 can be operated. The required force can be made substantially constant.

Therefore, also in the grinder 2D of the present embodiment, the operation of the operation unit 80 can be facilitated as compared with the case where the operation unit is configured by the paddle switch described above, and further, the grinders 2 and 2A of each of the above embodiments can be operated easily. The same effect as 2B and 2C can be obtained.

Although the embodiment of the power tool of the present disclosure has been described above, the power tool of the present disclosure is not limited to the above embodiment and can take various forms.
For example, in the first to fifth embodiments, an AC drive type grinder in which the power cord 18 is pulled out from the rear housing 8 has been described. On the other hand, as illustrated in FIG. 21, the rear housing 8 is provided with a mounting portion 102 for detachably mounting the battery pack 100, and is supplied from the battery in the battery pack 100 mounted on the mounting portion 102. It may be a rechargeable grinder that operates by receiving the DC power generated.

Further, in the first to fifth embodiments, the grinder has been described as an example, but the power tool of the present disclosure is a housing in which a motor as a power source such as a reciprocating saw that reciprocates saw teeth by rotation of the motor is housed. It may be an electric tool used in a state of gripping.

Further, a plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified only by the wording described in the claims are embodiments of the present invention.

2,2A, 2B, 2C, 2D ... Grinder, 4 ... Motor housing, 6 ... Gear housing, 8 ... Rear housing, 10 ... Wheel cover, 12 ... Motor, 14 ... Rotating shaft, 16 ... Power supply wiring, 18 ... Power supply Cord, 24 ... Spindle, 32 ... Inner flange, 34 ... Lock nut, 36 ... Tip tool, 40, 40A, 40B, 60, 80 ... Operation unit, 41, 41A, 41B ... Opening, 42, 42A, 42B ... Swing member, 43, 43A, 43B ... Projection piece, 44, 48 ... Pin, 44A, 44B ... Support shaft, 45, 45A, 45B, 64 ... Torsion coil spring, 46, 49A, 49B, 57A, 57B, 63, 74 ... Projections, 47A, 47B ... Projections, 50 ... Switches, 51 ... Movable parts, 52 ... Intermediate members, 53 ... Support shafts, 54, 66, 93 ... Compression coil springs, 56 ... Guide holes, 58, 72, 92 ... Support hole, 61, 82 ... Flange part, 62 ... Support part, 76 ... Case, 81 ... End part, 83 ... Connecting part, 84 ... Pushing part, 91 ... Insert hole, 100 ... Battery pack.

Claims (10)

With the motor
A switch for energizing the motor and
A housing having a tubular grip portion that can be gripped by the user and accommodating the motor and the switch inside.
An operation unit that is displaceably provided in the grip portion of the housing and is configured to switch the switch from an off state to an on state by moving from a reference position to an operation position by an external operation.
A lock-off mechanism configured to fix the operation unit at the reference position, hold the switch in the off state, and release the fixation to the reference position by an external operation.
With
The operation portion constitutes a part of the outer surface of the grip portion and is provided on the grip portion so as to be displaceable in the central axis direction of the grip portion, and the operation position is changed from the reference position by the external operation. It is configured to move to and return to the reference position when the external operation is stopped.
The lock-off mechanism is provided in the housing so as to be swingable around an axis orthogonal to the central axis of the grip portion, which is the displacement direction of the operation portion, and the operation portion moves from the operation position to the reference position. When it returns, it is configured to fix the operation unit to the reference position at a predetermined swing position.
The lock-off mechanism is
It is provided so as to be swingable around a rotation shaft, and one end side of the rotation shaft is provided with a projecting piece projecting from an opening provided in the operation portion to the outside of the housing. On the other end side of the moving shaft, a swinging member having a protrusion that protrudes in the axial direction parallel to the rotating shaft and is inserted into a guide hole provided in the housing.
An urging member that urges the other end side of the swing member toward the inside of the housing with the rotation shaft as the center.
The guide hole is provided with a straight portion that guides the protrusion in a displaceable manner in the central axis direction of the grip portion, and the protrusion is inserted at one end side of the straight portion by the urging of the urging member. It has an L-shape with an insertion part,
By inserting the protrusion into the insertion portion, the operating portion is fixed at the reference position, and when the operating portion is at the reference position, the projecting piece is pushed inside the operating portion. An electric tool configured so that the protrusion moves to the straight portion and can be displaced in the central axis direction of the grip portion . The power tool according to claim 1, wherein the rotating shaft is a pin arranged as an axis orthogonal to the central axis of the grip portion on the side opposite to the outer surface of the operating portion. The power tool according to claim 1 or 2, wherein the urging member is a torsion coil spring. It is arranged between the movable part of the switch and the operation part in the housing, and when the operation part moves to the operation position, the movable part of the switch is pressed to turn the switch from an off state to an on state. The power tool according to any one of claims 1 to 3, further comprising an intermediate member for switching to . The intermediate member is provided so as to be swingable around the axis of the support shaft with respect to a support shaft provided in the housing so as to be orthogonal to the central axis of the grip portion, and a part thereof is provided in the operation portion. The power tool according to claim 4 , which is configured to be abutted and when the operating portion moves from the reference position to the operating position, it is displaced toward the inside of the housing and pushes the movable portion of the switch. .. The power tool according to any one of claims 1 to 5 , wherein the motor is driven by power supplied from a battery that can be attached to the housing when the switch is in the ON state. Any one of claims 1 to 6 , wherein the operating portion has a long shape and is arranged so as to crawl on the outer surface of the grip portion so that the central axis direction of the grip portion is the longitudinal direction. Power tools described in the section. With the motor
A switch for energizing the motor and
A housing having a tubular grip portion that can be gripped by the user and accommodating the motor and the switch inside.
An operation unit that is displaceably provided in the grip portion of the housing and is configured to switch the switch from an off state to an on state by moving from a reference position to an operation position by an external operation.
A lock-off mechanism configured to fix the operation unit at the reference position, hold the switch in the off state, and release the fixation to the reference position by the external operation.
With
In the housing, the outer circumference around the central axis of the storage area of the motor is configured as the grip portion.
The operation unit crawls on the outer surface of the grip portion and is arranged long in the direction of the central axis , and when performing an operation of switching the switch from the off state to the on state, which position of the operation unit is set. It is configured so that the load required for the external operation is constant even if it is operated .
The operation portion includes a main body portion that forms a part of the outer surface of the housing, a pressing portion that is arranged on the rear end side of the switch and pushes the movable portion by moving the operation portion forward, and the main body portion. It is provided with a connecting portion for connecting the pressing portion and the pressing portion.
The pressing portion and the connecting portion are integrally formed with the main body portion, and a plurality of the main body portion and the connecting portion are provided.
The operating portion is rotatably formed around the central axis of the housing.
The lock-off mechanism releases the lock to the reference position by rotating the operation unit from the reference position by the external operation.
The power tool is configured so that the operating portion can be displaced along the direction of the central axis after the fixing to the reference position is released . The power tool according to claim 8, wherein the entire operation unit has a U shape. The power tool according to claim 8 or 9, wherein a pair of the main body portion and the connecting portion are provided vertically with the central axis of the housing interposed therebetween.