JP2002270066A - Operating switch of power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem with the operating switch of a power grinder locked on when a switch lever is slid to ON side and a one end side is pressed that, in the locked on state, the other tilted end side is raised to expose the inside operating hole which may be clogged with foreign matter such as chips. SOLUTION: An elastic small piece (shielding member 30) is fitted to the other tilted end side of the switch lever 1. When the switch lever 1 is locked on and the other tilted end side is raised, the operating hole 11 is shielded by the shielding member 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation switch for an electric tool such as an electric grinder.

[0002]

2. Description of the Related Art Conventionally, for example, in the above-mentioned electric grinder,
It has a built-in switch for turning on and off the electric motor built in the housing, and an operation switch for remotely controlling this built-in switch with a fingertip. This operation switch has a lock-on function to lock the built-in switch in the on state. Things are provided. A conventional operation switch having a lock-on function has a substantially flat plate-shaped switch lever slidably provided along the machine length direction on the housing side of the power tool, and the switch lever has an operation hole formed in the housing. The switch lever is slid to the front side (on side), for example, and the front end is pushed downward at this front side position (on position) (tilting the switch lever to the forward tilt position). The switch lever is held in the ON position by engaging the housing with the housing, thereby locking the built-in switch in the ON state.

[0003]

According to the conventional operation switch configured as described above, in the lock-on state, the rear end portion is lifted upward to expose the operation hole. There is a possibility that dust, chips, foreign matter, etc. (hereinafter, referred to as chips, etc.) may enter the inside of the housing and cause a malfunction of the operation switch or the like. In particular, when the operation hole is located near the motor cooling fan, external dust is easily sucked into the operation hole. The present invention has been made in view of this problem, and has as its object to provide an operation switch that can prevent chips and the like from entering an operation hole or a housing.

[0004]

Therefore, the present invention provides an operation switch having the structure described in each of the above claims. According to the operation switch of the first aspect, when the tilting one end side of the switch lever is pressed down, the switch lever is operated, for example, to the ON side, whereby the built-in switch provided in the housing is turned ON. When the tilting one end of the switch lever is pushed down, the tilting other end floats up and separates from the outer surface of the housing. When the other end of the tilt is lifted, the shielding member is extended between the other end of the tilt and the outer surface of the housing with the lifting operation, so that the operation hole is shielded from the outside. Is prevented from entering the operation hole and the housing, thereby preventing operation failure of the operation switch and operation failure of a mechanism incorporated in the housing. The shielding member can be attached to the switch lever side, the housing side, or both.

According to the operation switch of the present invention, when the switch lever is slid to the ON side, the built-in switch is turned ON, and when the tilting one end side is pushed down in the ON position, the switch lever is locked to the ON position. (Lock-on function). When the tilting one end side is pressed down, the tilting other end side is displaced in a direction to float up from the outer surface of the housing. Since the shielding member extends between the other end of the tilting and the outer surface of the housing, the operation hole is shielded from the outside similarly to the above, thereby preventing chips and the like from entering the operation hole and the like, Therefore, these malfunctions can be avoided. When the other end of the tilt of the switch lever is pushed down in the ON state of the built-in switch, the engagement state of the one end of the tilt with the housing is released, whereby the lock-on state of the switch lever is released.
After releasing the lock-on state, slide the switch lever to the off side to turn off the built-in switch.

In the case where the operation hole is formed in a long slot shape long in the sliding direction in order to provide the switch lever so as to be slidable, a wider range of the operation hole in the lock-on state of the switch lever in the related art. According to the configuration of claim 2, the switch lever is exposed to the outside. In the lock-on state of the switch lever, between the other end of the tilt of the switch lever (the side floating from the housing outer surface) and the housing outer surface. Since the operation member is shielded from the outside by extending the shielding member, intrusion of cuttings and the like into the operation hole can be greatly reduced. in this way,
The present invention relates to an operation switch for remotely controlling a built-in switch to be turned on or off by sliding a switch lever, and an operation switch with a lock-on mechanism for tilting the switch lever on the on side and holding the position on the on side. Particularly effective when applied to According to the operation switch of the third aspect, the above-described effects can be obtained with a simple configuration and at low cost. Also, it is sufficient to attach an elastic plate piece as a shielding member to the other end of the tilt of the switch lever.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In this embodiment, an electric disk grinder (hereinafter, simply referred to as “electric grinder G”) will be described as an example of the electric tool. The entire electric grinder G is shown in FIG. In FIG. 1, reference numeral 50 denotes an electric motor as a drive source of the electric grinder G, and the rotation output of the electric motor 50 is transmitted to a circular grindstone 52 via a bevel gear mechanism 51. The electric motor 50 is started and stopped by turning on and off the built-in switch 6, and the built-in switch 6 is built in the rear of the electric motor 50, that is, in the rear of the housing 10 as shown in the figure. By arranging the built-in switch 6 at the same position, styling that the electric grinder G can be easily gripped is secured. In order to ensure the operability of the electric grinder G, that is, the easiness of the on / off operation of the built-in switch 6, an operation switch S for remotely controlling the built-in switch 6 is provided at the front of the housing 10.
Is provided. In the present embodiment, the operation switch S
And the basic structure of the drive mechanism of the electric grinder G described above does not need to be changed.

The operation switch S includes a substantially plate-shaped switch lever 1 and an operation switch rod 2 connecting the switch lever 1 and the knob 6a of the built-in switch 6. As shown in FIG. 2, the switch lever 1 is slidably supported on a seating surface 5 formed on a front surface of a housing 10 in a longitudinal direction (left and right directions in the drawing).
In the present embodiment, the seat surface 5 corresponds to the “outer surface of the housing” described in the claims. A substantially central operation hole 11 and a front locking hole 13 are formed in the seat surface 5 so as to pass through the housing 10, respectively. Stopper portions 12, 12 are formed on both left and right sides (see FIG. 5). 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 referred to as a convex part 12a, and the side lower one step is referred to as a base part 12b.

The switch lever 1 is supported so as to be superimposed on the seat surface 5 thus formed. The upper surface of the switch lever 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 rib in the width direction formed substantially at the center of the switch lever 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 formed in a semi-arc shape. The tilt fulcrum 16 is brought into contact with the seat surface 5. The switch lever 1 can be tilted in the front-rear direction (left-right direction in the drawing) about the tilting fulcrum 16, and the other portions are slightly floating from the seating surface 5.
In the present embodiment, the front side (left side in FIG. 2) of the tilt fulcrum 16 corresponds to one end side described in the claims, and the rear side (right side in FIG. 2) corresponds to the other end side.

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 connecting arm 15 is protruded into the housing 10 through the operation hole 11 of the seat surface 5, and the hook-shaped portion 15 a at the tip thereof is hooked on the connection hole 2 a provided at the front end of the operation switch rod 2. I have. Details of the operation switch rod 2 will be described later. Further, a stopper edge 17 in the form of a rib is formed at the front of the lower surface of the switch lever 1, and a locking projection 18 is formed at the center of the stopper edge 17 in the longitudinal direction. 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. 4). On the other hand, the locking projection 18 is
2 and 12 and the width of the locking hole 1 in the seating surface 5
3 is formed with a width and thickness that can be inserted into the inside. The front of the stopper edge 17, that is, the front portion of the switch lever 1 is formed to be inclined upward and escape. On the lower surface on the other end side of the switch lever 1, a shielding member 30 which is a small piece is attached. This shielding member 30
Extend obliquely downward and rearward, and the tip thereof is in sliding contact with the seat surface 5. This shielding member 30 has elasticity. This elastic force acts in a direction in which the distal end side of the shielding member 30 is pressed against the seat surface 5. For this reason, even if the other end side is displaced in the vertical direction with the tilting operation of the switch lever 1 as described later, the tip side of the shielding member 30 is always elastically pressed against the seating surface 5. Thereby, the operation hole 11 is always shielded from the outside.

The seat surface 5 and the switch lever 1 are configured as described above. When the switch lever 1 is at the rear position of the seat surface 5 as shown in FIG.
7 is placed on the base portion 12b of the stopper portion 12. When the slide member 7 is slid forward (leftward in the figure) in this state, the stopper edge 17 hits the stepped portion 12c of the stopper portion 12 and moves further. Is to be blocked. On the other hand, when the rear end of the switch lever 1 is pushed down at the rear position of the seating surface 5 as shown in FIG. 7 and the switch lever 1 is tilted rearward about the tilting fulcrum 16, the stopper edge The lower end of 17 moves upward to a position higher than the stepped portion 12c, so that the switch lever 1 can be slid to the front position only when in the rearwardly inclined posture. When the switch lever 1 is slid forward and the stopper edge 17 passes through the stopper portion 12, the switch lever 1 can be tilted forward. When the switch lever 1 is tilted forward, the locking projection 18 is inserted into the locking hole 13. .

Next, the operating switch rod 2 hooked on the connecting arm 15 of the switch lever 1 through the connecting hole 2a is substantially formed on the inner peripheral surface of the housing 10 as shown in FIG. And the rear end side thereof reaches the rear of the electric grinder G. As shown in FIG. 6, the rear end side of the operation switch rod 2 (FIGS.
(Right end side in FIG. 2) is provided with a connecting portion 2b. The knob 6a of the built-in switch 6 is engaged with the connecting portion 2b. The operation switch rod 2 and the housing 1
The compression spring 4 is interposed between 0 and 0. Therefore, the operation switch rod 2 is biased rightward in FIG. When the operation switch rod 2 moves rightward in the figure by this urging force, the knob 6a engaged with the connecting portion 2b tilts to the off side (right side in the figure) as shown in the figure, and the built-in switch 6 is turned off. To turn on the built-in switch 6, the switch lever 1 is operated as follows. That is, as shown in FIG. 7, the rear part of the switch lever 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 lever 1 can slide forward.

Next, the switch lever 1 is slid to the front position against the compression spring 4 in the backward tilted posture. As a result, the knob 6a is tilted forward, and the built-in switch 6 is turned on. Thereafter, as shown in FIG. 8, when the front portion of the switch lever 1 is pushed down to the forward inclined position, the locking projection 18 is inserted into the locking hole 13 as shown in FIG. Here, the switch lever 1 is urged rearward (to the right in FIG. 9) by the compression spring 4 (see FIG. 6), so that when the locking projection 18 is inserted into the locking hole 13, The urging force causes the locking projection 18 to be hooked on the inner peripheral surface of the locking hole 13 or the lower end of the stopper edge 17 to be caught on the front end surface of the stopper portion 12, whereby the switch lever 1 is tilted forward. , And thus the switch lever 1 is held in the forward position, so that the built-in switch 6 is locked in the ON state.
This corresponds to the lock-on state. To release the lock-on state of the built-in switch 6 and turn it off, it is sufficient to simply push down the rear end of the switch lever 1. That is, if the rear end side of the switch lever 1 held in the forwardly inclined position is pushed down with a finger to release the locking projection 18 from the end of the locking hole 13, the switch lever 1 is tilted forward. Is canceled. When the forward leaning posture is released, the switch lever 1
Is returned backward by the compression spring 4, and the built-in switch 6 is switched to the off side.

As described above, according to the operation switch S of this embodiment, the switch lever 1 is held in the forwardly inclined position and is locked on, and the other end of the switch lever 1 is directed upward. Even in a state in which the distance between the operating hole 11 and the seat surface 5 is increased due to the displacement, the operation hole 11 is shielded from the outside by the shielding member 30, so that chips and the like can be removed from the operation hole 11.
Of the switch lever 1 can be prevented. In addition, since dust is prevented from entering the housing 10 through the operation hole 11, malfunction of the electric grinder G can be prevented. Various modifications can be made to the embodiment described above. For example, although a small piece having elasticity has been illustrated as an example of the shielding member, a bellows, a cloth, or the like may be attached between the other end of the switch lever 1 and the seat surface instead. In other words, at least when one end of the switch lever is pushed down to turn on or off the built-in switch, a shielding member sufficient to prevent entry of foreign matter into the operation hole is provided on the other end of the tilt that rises from the outer surface of the housing. What is necessary is just to set it as the structure arrange | positioned between the other end side of inclination of a lever, and a seat surface.

The shield member may be formed integrally with the lower surface or the rear end of the switch lever by integral molding of a synthetic resin. Conversely, the shielding member can be retrofitted using fixing means such as bonding or screwing. Further, the configuration in which the shielding member is attached to the switch lever side is illustrated, but the configuration in which the shielding member is attached to the seat surface side may be adopted. Further, although the lock-on state is illustrated by holding the switch lever 1 in the forwardly inclined state, the present invention can be applied to an operation switch that holds the switch lever 1 in the backwardly inclined state to be in the lock-on state. it can. In this case, the rear end side of the switch lever (the rear end side of the power tool) corresponds to one end of the tilt described in the claims, and the front end corresponds to the other end of the tilt. In addition, the operation switch S in which the switch lever 1 is slid forward and backward along the machine length direction of the power tool has been illustrated, but the switch lever is slid in a direction perpendicular to the machine length direction (width direction of the power tool) to enable the built-in switch. The present invention can also be applied to an operation switch that turns on and off the switch 6. Further, the operation switch S in which the switch lever 1 is slid to turn the built-in switch 6 on and off is exemplified, but the present invention is applied to an operation switch in which the built-in switch 6 is turned on and off by simply tilting in the machine direction or width direction. Can also. Therefore, the present invention can be applied to an operation switch having no lock-on function as illustrated. Furthermore, although an electric disk grinder is illustrated as an example of the electric tool, the present invention can be similarly applied to other electric tools such as an electric drill, an electric cutter, an electric screwdriver, and an electric circular saw.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, and is a longitudinal sectional view of an electric grinder.

FIG. 2 is a side view of the operation switch according to the illustrated embodiment. In this figure, the bearing surface is shown in a longitudinal sectional view.

FIG. 3 is a side view of a switch lever.

FIG. 4 is a view seen from a direction of an arrow (4) in FIG. 3, and is a bottom view of the switch lever.

FIG. 5 is a plan view of a seat surface.

FIG. 6 is a side view around an engagement portion between the operation switch rod and the built-in switch.

FIG. 7 is a side view showing an operation state of an operation switch.
This figure shows a state in which the other end side of the switch lever is pushed down to a rearwardly inclined posture.

FIG. 8 is a side view showing an operation state of an operation switch.
This figure shows a state where the switch lever is slid forward (on side).

FIG. 9 is a side view showing an operation state of an operation switch.
This figure shows a state in which one end side of the switch lever is pushed down to a forwardly inclined posture, whereby the built-in switch is locked on.

[Explanation of symbols]

G: Electric grinder (electric tool) S: Operation switch 1: Switch lever 2: Operation switch rod, 2a: Connection hole, 2b: Connection part 4: Compression spring 5: Bearing surface 6: Built-in switch, 6a: Knob 10: Housing DESCRIPTION OF SYMBOLS 11 ... Operation hole 12 ... Stopper part, 12a ... Convex part, 12b ... Stand part, 12
c: Stepped portion 13: Locking hole 15: Connection arm, 15a: Hook-shaped portion 16: Tilting fulcrum 17: Stopper rim 18: Locking projection 30: Shielding member 50: Electric motor 51 ... Bevel gear mechanism 52: Grinding stone

Continued on the front page (72) Inventor Fumiyo Numata 3-11-8 Sumiyoshi-cho, Anjo-shi, Aichi F-term in Makita Co., Ltd. 5G010 KB09 LB08 5G019 CX11 KK21 SY17

Claims (3)

[Claims] 1. A switch which is tiltably provided on an outer surface of a housing of a power tool, is linked to a built-in switch provided in the housing through an operation hole provided in the housing, and switches the built-in switch on / off by tilting operation. A lever provided between the switch lever and the outer surface of the housing. The tilting of the switch lever is caused by a lifting operation from the outer surface of the housing at the other end of the tilt associated with a pressing operation of one end of the tilt of the switch lever. An operation switch including a shielding member extending between the other end and an outer surface of the housing to shield the operation hole. 2. A built-in switch which is slidably and tiltably provided on an outer surface of a housing of a power tool, is linked to a built-in switch provided in the housing through an operation hole provided in the housing, and is slid to an ON side. A switch lever that is held at the ON side when the tilting one end side is pushed down on the ON side to engage with the housing side, and provided between the switch lever and the outer surface of the housing. The switch lever is extended between the other end of the tilt and the outer surface of the housing along with an operation of lifting the other end of the switch from the outer surface of the housing in accordance with the operation of pressing down the one end of the tilt of the switch lever. An operation switch including a shielding member for shielding the operation hole. 3. The operation switch according to claim 1, wherein a shield member serving as an elastic plate is attached to a lower surface of the other end of the switch lever on the tilting side, and the elastic member is used to shield the shield. An operation switch in which the distal end side of the member is slidably contacted with the outer surface of the housing to shield the operation hole with the shielding member.