JP2606445Y2 - Switch structure of portable power tool - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch structure for a portable power tool.

[0002]

2. Description of the Related Art In general, in this type of electric tool, there is a certain restriction on the arrangement of each part because the grip portion needs to be formed into a compact shape that can be easily gripped with one hand. For this reason, a switch body for turning on and off the drive motor is usually built in the rear part of the housing in many cases.

On the other hand, from the viewpoint of operability, it is necessary to make it possible to perform the on / off operation of the switch body while holding the switch with the hand on the holding side. In many cases, another switch mechanism of a slide type is provided so that the switch body can be remotely operated. Hereinafter, this remote control switch is referred to as a “remote switch” and is distinguished from a switch body built in the housing.

[0004] By providing the remote switch in this manner, good operability of this type of power tool is ensured. However, since the remote switch is located at hand, erroneous operation is prevented. Function is required.
That is, the remote switch, simple operation when turned off simply structure needs to be a different motion as well slides, and from the viewpoint of operability in the case of ON operation in terms of erroneous operation movement prevention Is required.

Conventionally, as a remote Switch for both sides of and good operability this erroneous operation movement preventing, for example, JP 55
Japanese Patent Application Publication No. 83582 or Japanese Utility Model Application Laid-Open No. 57-48087.

[0006]

However, in the above-mentioned conventional remote switch, however, FIGS. 19 and 2 shown in FIGS. 1 and 5 of the above publications, respectively.
As shown in FIG. 0, in addition to the remote switch body (slider (a) in the former case and sliding piece (c) in the latter case) both of which are slidably arranged on the front surface of the housing, as shown in FIG. These conventional remote switches are composed of multiple members. For example, it is necessary to attach another member (a latch member (b) in the former case, a push rod (d) in the latter case) for performing another movement. Therefore, there is a problem that the structure becomes complicated. In addition, there is a problem that a malfunction is likely to occur due to a complicated structure.

[0007] The present invention has been made in view of this problem,
Erroneous operation combines dynamic protection and good operability, moreover structures cause less simple malfunction, and to provide a switch of the portable power tool.

[0008]

According to a first aspect of the present invention, there is provided a switch structure for remotely controlling a switch body built in a rear portion of a housing for turning on and off a drive motor of a portable power tool. A switch knob is provided on a seat provided on a front surface of the housing so as to be slidable between a front position corresponding to an on state of the switch body and a rear position corresponding to an off state of the switch body.
A tilting fulcrum is provided on the lower surface of the switch knob;
The switch knob is tilted back and forth with the point in contact with the seat
Provided on the lower surface of the switch knob.
Connecting arm extending from the housing to the inside of the housing
A switch lock between the connecting arm and the switch body.
And the switch rod is spring-biased rearward.
Biasing the switch knob toward the rear position side, and
The lower surface of the switch knob and the front side of the tilt fulcrum
In addition, the switch knob is provided on the seat surface except for the backward tilted posture.
To the front position side of the switch knob
The stopper rim that prevents sliding of the switch knob and the switch knob
When it is tilted forward at the front position, it is provided on the seat surface.
The switch knob is locked in the front position by being locked in the locking hole.
Holding the switch projection, the switch knob is tilted backward
Can be slid to the forward position only and tilt forward at the forward position
It is configured to be held at the front position only when moved . The switch structure according to claim 2 is
The switch structure according to claim 1, wherein the switch knob
Sliding forward on the upper surface and ahead of the tilting fulcrum
Align the finger rest for applying a finger during operation with the finger.
It is characterized in that it is formed in a convex shape in an arc shape.

[0009]

According to the above structure, the rear portion of the switch knob is pushed down to the rearwardly inclined position, and when the switch knob is slid to the front position against the spring in the state of the backwardly inclined position, the operating portion of the switch body is moved forward by the switch rod. And the switch body is turned on. Then, when the switch knob is tilted forward at this front position to lock the locking projection in the locking hole of the seat surface, the switch knob is held at this front position, and thus the switch body is held in the ON state.

If the switch knob is slid forward without tilting the switch knob backward, the switch knob is prevented from sliding by the stopper formed on the seat surface, and the switch body is turned on. Can not do. For this reason, in order to turn on the switch body, first, the switch knob is set to the rearwardly inclined position, the rearwardly inclined position is held, and the switch knob is slid to the front position. It is necessary to provide the switch knob with a total of three movements of locking the locking projection in the locking hole, thereby preventing erroneous operation of the switch.

On the other hand, in the ON state, the rearward position of the switch knob which is in the forwardly inclined position is depressed to release the locking projection from the locking hole, thereby releasing the forwardly inclined position. The switch knob is returned to the rear position by the urging force of the spring, so that the operation section of the switch body is moved rearward, and the switch body is switched to the off state. When the switch body is released from the forward tilt position at the front position, the switch knob moves without being blocked by the stopper portion and returns to the rear position. As described above, switching the switch from the on state to the off state is sufficient simply by pushing down the rear portion of the switch knob. or,
According to the switch structure of the second aspect, the operation and effect can be improved.
In addition, finger sliding during slide operation is prevented, ensuring reliable operation.
You can get a feeling of work. In particular, the finger rest
Is formed in an arc shape,
Good finger fit (hit)
Even a good operation feeling can be obtained. And fingertips
The switch knob to the forward position.
When trying to ride, the finger rest is higher than the tilting fulcrum.
Since the switch knob is located on the front side,
In addition to the forward pushing force for
The force in the direction of tilting the valve forward acts. Switch knob
Force in the forward tilt direction acts when it is located at the rear position
And the stopper edge is more firmly pressed against the stopper
You. Therefore, the switch knob must be tilted backward.
If you try to slide forward without
It engages more firmly with the topper, and
Slide operation is prohibited and incorrect operation of the switch knob
Layers are reliably prevented.

[0012]

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a main part of the present embodiment, and shows an enlarged view of a portion A in FIG. FIG. 4 shows an entire disc grinder as an example of a portable electric tool. In FIG. 4, reference numeral 50 denotes a drive motor as a drive source of the disk grinder.
Is transmitted to the grindstone 52 via the bevel gear mechanism 51. Reference numeral 53 in the figure denotes a safety cover, and this safety cover 53 is formed so as to cover almost half the circumference above the grindstone 52 as shown in FIGS. This safety cover 53 will be further described later.

The drive motor 50 is started and stopped by turning on and off the switch body 6, and the switch body 6 is connected to the drive motor 50 as shown in the figure.
At the rear of the housing 10, that is, at the rear of the housing 10. By arranging the switch body 6 at the same position, styling that the disk grinder can be easily gripped is secured.

In order to ensure the operability of the disc grinder, that is, the ease with which the switch body 6 is turned on and off, a remote switch for remotely operating the switch body 6 is provided at the front of the housing 10. I have. Hereinafter, this remote switch is simply referred to as “switch S”.
The switch body 6 built in the housing 10
To be distinguished.

The switch S includes a switch knob 1 having a substantially flat plate shape, a switch rod 2 connecting the switch knob 1 and an operation knob 6a of the switch body 6, and an intermediate switch rod 2 and the housing 10. And a spring 4 mounted thereon.

As shown in FIG. 1, the switch knob 1 is slidably supported on a seat surface 5 formed on a front surface of a housing 10 in a front-rear direction (left-right direction in the drawing).

The seat 5 has a substantially central insertion hole 11.
And a front locking hole 13 are formed to penetrate, respectively.
Further, stopper portions 12 and 12 are formed on both left and right sides substantially between the insertion hole 11 and the locking hole 13 (see FIG. 7). The upper surface of the stopper portion 12 is stepped at substantially the center as shown in the figure. In the following description, the one step higher side in the left half of the figure with respect to the center stepped part 12c is the convex part 12a, and the step lower side is the base part
2b.

The switch knob 1 is supported on the seating surface 5 formed as described above so as to be hung. The upper surface of the switch knob 1 is formed so as to be inclined upward in the left half of the figure, and unevenness for preventing slippage is formed on the inclined surface.

On the other hand, the widthwise rib formed substantially at the center of the switch knob 1 is formed so as to protrude from the lower surface thereof, and the protruding portion (the left corner in the drawing) of the protruding portion is a semicircle. The tilt fulcrum 16 is formed in an arc shape. The switch knob 1 around the tilting fulcrum 16
Can be tilted in the front-rear direction (horizontal direction in the drawing), so that the other parts are floating from the seat surface 5.

An L-shaped connecting arm 15 protrudes from the center of the rib on which the tilting fulcrum 16 is formed in the longitudinal direction. The connection arm 15 is protruded into the housing 10 through the insertion hole 11 of the seat surface 5,
The hook-shaped portion 15a at the tip is hooked on a connection hole 2a formed at the tip of the switch rod 2.

A stopper edge 17 in the form of a rib is formed at the front of the lower surface of the switch knob 1, and a locking projection 18 is formed at the center of the stopper edge 17 in the longitudinal direction.
Are formed to protrude. The stopper edge 17 is formed along the width direction so as to be able to span the stopper portions 12 on the seat surface 5 side (see FIG. 6). On the other hand, the locking projection 18 is formed to have such a width as to be able to pass between the two stopper portions 12, 12, and to be able to be inserted into the locking hole 13 in the seating surface 5. The front of the stopper edge 17, that is, the front part of the switch knob 1 is formed to be inclined upward and escaped.

The seat surface 5 and the switch knob 1 are formed as described above. When the switch knob 1 is at the rear position shown in the drawing, the stopper edge 17 is placed on the base 12b of the stopper portion 12. When the slider is slid forward (leftward in the figure) from this state, the stopper edge 17 hits the stepped portion 12c of the stopper portion 12 and further movement is prevented.

On the other hand, when the rear end of the switch knob 1 is depressed at the rearward position and the switch knob 1 is tilted rearward about the tilting fulcrum 16, the lower end of the stopper edge 17 moves upward. And the stepped portion 12c
The switch knob 1 is slidable to the forward position only when in the rearwardly inclined position. When the switch knob 1 is slid forward and the stopper edge 17 passes through the stopper portion 12, the switch knob 1 can be tilted forward, so that the locking projection 18 is inserted into the locking hole 13. Has become.

Next, the connecting arm 1 of the switch knob 1 will be described.
The switch rod 2 hooked on 5 is arranged substantially along the inner peripheral surface of the housing 10 as shown in FIG. 1, FIG. 2 or FIG. This switch rod 2 is shown in FIG.
Alternatively, it is composed of a rod body 20 shown in FIG. 12 and a connecting member 21 shown in FIG. 13 or FIG.

The rod body 20 has a thin plate shape as shown in the figure, and has a cutout 20b at the center thereof so that dust and the like do not accumulate. This rod body 20
The connecting rod 1 of the switch knob 1
An engaging hole 20a for hooking 5 is formed therethrough. On the other hand, a spring 4 is provided on the lower surface near the right end in the figure.
Are formed facing each other at a fixed interval. In addition, this rod body 2
A connecting portion for connecting the connecting member 21 is formed at the right end in the drawing of FIG.
20d for fitting the end of the
Is formed from a support hole 20e formed substantially at the center of the hole.

The connecting member 21 is connected to the distal end of the rod body 20 as described above, and has a connecting edge 21a fitted into the recess 20d of the rod body 20 and a connecting edge 21a at the left end as shown in the figure. And a pin portion 21b formed substantially at the center of the lower surface of the edge 21a and inserted into the support hole 20e of the rod body 20. On the other hand, a connection groove 21c for inserting the operation knob 6a of the switch body 6 is formed near the lower right end of the connection member 21. The connecting edge 21 of the connecting member 21 thus formed
This connecting member 21 is connected to the distal end of the rod body 20 in a state where a is fitted into the concave portion 20d of the rod body 20 and the pin portion 21b is inserted into the support hole 20e, whereby the switch rod 2 is configured.

A compression coil spring is used as the spring 4 as shown in FIG.

The switch rod 2 thus constructed is mounted on the housing 10 with the spring 4 mounted between the projections 20c, 20c as described above.
The two projections 20c, 20c
Of the switch rod 2
Is provided for the convenience of mounting the spring 4 in a predetermined state when the switch rod 2 is mounted on the housing 10. It is in a state of not supporting apart.

That is, when assembling the switch rod 2 to the housing 10, the spring 4 is once sandwiched between the projections 20c, 20c.
Here, as shown in FIG. 2, in the middle of the path where the switch rod 2 is arranged, the housing 10 is formed with a support wall 30 that protrudes inward.

As shown in FIG. 3, a T-shaped groove is formed in the support wall 30. A horizontal groove 30a is formed to have a vertical width and a horizontal width in which the rod body 20 can be inserted. Direction groove 30b is provided on the left protrusion 2
It is formed with a width that allows the pedestal portion 20f on which 0c is formed to be inserted. Further, on both sides of the vertical groove 30b, spring seats 30c, 30c to which the ends of the spring 4 are slightly fitted are formed.

The groove 3 of the support wall 30 thus formed
2, the switch rod 2 is inserted into the housing 10 from the right side in FIG. 2, and the connecting arm 15 of the switch knob 1 is hooked into the locking hole 20a formed at the tip thereof. In this assembled state, the spring 4 is attached to the spring seat 30c of the support wall 30, that is, the housing 10 and the projection 2 on the right side in the drawing.
0c, whereby the switch rod 2 and thus the switch knob 1 are urged rightward in the figure, that is, toward the rear position.

With the switch S configured as described above, the switch body 6 is remotely operated as follows. First, when the switch knob 1 is at the rear position as shown in FIG. 1, the operation knob 6a of the switch main body 6 is in a state of being tilted rearward (right side in FIG. 2). Has become. In the off state, the stopper rim 17 of the switch knob 1 is placed on the base 12b of the stopper portion 12. Therefore, when the switch knob 1 is slid forward (leftward in the figure) as it is, The stopper edge 17 hits the stepped portion 12c of the stopper portion 12 to prevent further sliding, so that the switch body 6 cannot be turned on.

To turn on the switch body 6, the switch knob 1 is operated as follows. That is,
As shown in FIG. 8, the rear part of the switch knob 1 is pushed down to the rearwardly inclined posture. As a result, the lower end of the stopper edge 17 rises to a position higher than the stepped portion 12c of the stopper portion 12, so that the switch knob 1 can slide forward.

Next, the switch knob 1 is slid to the front position against the spring 4 in the backward tilted posture. As a result, the operation knob 6a of the switch body 6 is tilted forward, and the switch body 6 is turned on. Thereafter, as shown in FIG. 9, when the front portion of the switch knob 1 is pushed down to the forward inclined position, the locking projection 18 is moved to the position shown in FIG.
As shown in FIG. Here, the switch knob 1 is biased rearward by the spring 4. Therefore, when the locking projection 18 is inserted into the locking hole 13, the biasing force causes the locking projection 18 to be pushed into the locking hole 13. A state in which the switch knob 1 is hooked on the peripheral surface, or a state in which the lower end of the stopper edge 17 is hooked on the front end surface of the stopper portion 12, whereby the switch knob 1 is held in the forwardly inclined posture,
As a result, the switch knob 1 is held at the front position, and thus the switch body 6 is held in the ON state.

In order to turn on the switch body 6 in this manner, first, the rear part of the switch knob 1 is depressed to a rearwardly inclined position, and then the switch knob 1 is slid forward while maintaining this rearwardly inclined position. After that, this switch knob 1
The three operations of pushing down the front portion of the lock knob 18 so that the locking projection 18 is hooked on the locking hole 13 are shown in FIG.
It is necessary to give to. On the other hand, if the switch knob 1 is not pushed backward but simply pushed forward, the stopper edge 17 of the switch knob 1 hits the stepped portion 12c of the stopper portion 12 and further movement of the switch knob 1 is prevented. Therefore, the switch body 6 cannot be turned on. From this, erroneous operation of the switch S is reliably prevented.

Next, to switch the switch body 6 from the on state to the off state, it is sufficient to simply push down the rear part of the switch knob 1. That is, if the rear part of the switch knob 1 held in the forward tilted position is pushed down with a finger to release the locking projection 18 from the end of the locking hole 13, the forward tilted position of the switch knob 1 is released. Is done. When the forward tilt posture is released, the switch knob 1 is returned backward by the spring 4, and the switch body 6 is switched to the off side.

As described above, according to the switch structure of the present embodiment, three operations need to be given to the switch knob 1 to turn on the switch body 6, and the rear of the switch knob 1 is pushed down to Since the switch 6 cannot be turned on unless it is in the inclined position, erroneous operation of the switch is reliably prevented. Conversely, to turn off the switch body 6, it is sufficient to push down the rear part of the switch body 1 in the forwardly inclined posture with a finger, so that the operation is simple.

Further, since the switch knob 1 is tilted forward or backward to prevent the switch body 6 from being turned on or erroneously operated, other members are required as in the prior art. That is, only this switch knob 1 is sufficient. From this, the structure of the switch is simplified as compared with the related art, and thus, the malfunction does not occur unlike the related art.

Next, the safety cover 53 will be described. The safety cover 53 is rotatably mounted around the grindstone 52 at the tip end of the housing 10 via a bracket 54 as shown in FIG. The bracket 54 is formed in a substantially annular shape as shown in FIGS. 15 and 16, and has a concave portion 54a formed on the entire peripheral surface thereof. On the other hand, on the inner peripheral surface of the support cylinder portion of the safety cover 53, the recess 54
A convex portion 53a that can be fitted into a is formed. The safety cover 53 is attached to the housing 10 with the bracket 54 interposed therebetween, with the convex portion 53a fitted in the concave portion 54a. 52 is rotatable.

The safety cover 53 is attached to the housing 10 via the bracket 54 as described above, so that the safety cover 53 can be favorably supported for a long time. That is, since the conventional safety cover is attached directly to the housing, but gradually housing itself when the safety cover Ru rotated is had occurred the worn backlash or the like, according to the above construction housing Does not wear, and the bracket 54 is worn. However, since the bracket 54 can be easily replaced, the safety cover 53 can always be supported in a good state without play.

[0041]

According to the present invention, according to the invention], it is possible to switch for remote operation that combines both sides of erroneous operation dynamic protection and good operability without complicating the structure, malfunction of the switch And the like can be significantly reduced as compared with the related art.

[Brief description of the drawings]

1 is a side view of a switch knob according to an embodiment of the present invention, and is an enlarged view of a portion A of FIG. 4;

FIG. 2 is a side view showing a rear portion of the switch rod,
FIG. 5 is an enlarged view of a portion B in FIG. 4.

FIG. 3 is a front view of a support wall formed on a housing, and is a view as viewed in a direction indicated by an arrow C in FIG. 2;

FIG. 4 is a longitudinal sectional view of a portable disc grinder.

FIG. 5 is a side view of the switch knob.

FIG. 6 is a bottom view of the switch knob.

FIG. 7 is a plan view of a seat surface.

FIG. 8 is an operation explanatory view of the switch, and is a side view showing a state where a rear part of the switch knob is pressed down.

FIG. 9 is an explanatory view of the operation of the switch, and is a side view showing a state where a switch knob is slid to a front position.

FIG. 10 is an operation explanatory view of the switch, and is a side view showing a state where a front part of a switch knob is pressed down.

FIG. 11 is a plan view of a rod body.

FIG. 12 is a side view of the rod body.

FIG. 13 is a side view of the connecting member.

FIG. 14 is a bottom view of the connecting member.

FIG. 15 is a plan view of a bracket.

FIG. 16 is a longitudinal sectional view of the bracket,
FIG. 4 is a sectional view taken along line D.

FIG. 17 is a bottom view of the safety cover.

FIG. 18 is a longitudinal sectional view of the safety cover.

FIG. 19 is a longitudinal sectional view showing a conventional switch structure.

FIG. 20 is a longitudinal sectional view showing another conventional switch structure.

[Explanation of symbols]

 S ... Switch 1 ... Switch knob 2 ... Switch rod 4 ... Spring 5 ... Sheet surface 6 ... Switch body 10 ... Housing 12 ... Stopper part 13 ... Lock hole 16 ... Tilt support point 17 ... Stopper edge 18 ... Lock protrusion 30 ... Support Wall 50 ... Drive motor 52 ... Whetstone 53 ... Safety cover 54 ... Bracket

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B25F 5/00 H01H 15/10

Claims (2)

(57) [Scope of request for utility model registration] 1. A switch structure for remotely operating a switch body built in a rear portion of a housing for turning on and off a drive motor of a portable power tool, wherein a seat surface is provided on a front surface of the housing. On the top , a switch knob is slidable between a front position corresponding to the ON state of the switch body and a rear position corresponding to the OFF state.
And a tilting fulcrum is provided on the lower surface of the switch knob.
The switch knob can be tilted back and forth by contacting the seat surface
And protruding from the lower surface of the switch knob
Providing a connecting arm extending to the inside of the housing;
Arm and switch body connected by switch rod
Then, the switch rod is spring-biased rearward to switch the switch rod.
The knob is urged toward the rear position side, and is located on the lower surface of the switch knob from the tilt fulcrum.
Also on the front side, except for the switch knob in the rearwardly inclined position, the seating surface.
Abuts the stopper provided at the front of the switch knob.
Stopper edge for preventing sliding to the mounting side, and the switch
When the knob is tilted forward in the front position, the seat surface
The switch knob is locked in the locking hole provided in
The switch knob is provided with a locking projection
Can be slid to the front position side only in the inclined position and the front position side
A configuration in which it is held at the front position only when tilted forward with
Switch structure of a portable power tool, characterized in that it was. 2. The switch structure according to claim 1, wherein
On the upper surface of the switch knob and in front of the fulcrum,
Finger pad for applying finger during sliding operation
Was formed in an arc shape according to the finger.
A switch structure for a portable power tool.