JPS587946Y2 - trigger switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a trigger switch used, for example, in a small electric tool, and more particularly to a trigger switch that can be locked and held in an OFF state and an ON state.

A trigger switch, which is attached to the grip of a small power tool, turns on the contact when the operator pulls in the operator's fingertip.
Electrical connection is made so that power is supplied to the motor built in the tool in this on state.

Such a switch is in the off state when it is not operated, but if the switch operator accidentally retracts it when the tool user does not intend to, the motor inside the tool will rotate and, for example, the drill blade will become unnecessary. This is extremely dangerous as it may become spinning.

In order to avoid such a dangerous situation, an off-lock mechanism is provided to lock and hold the trigger switch in the off state, and when the switch is turned on, the off-lock mechanism is released before the retracting operation is performed. It is desirable to do so.

Further, it would be convenient if an on-lock mechanism was provided to keep the trigger switch in the on state during long-term work.

In these cases, it is desirable that the off-lock and on-lock release operations can be performed easily and successfully using the fingertips of the switch operator, and that the structure is particularly simple and highly reliable.

This idea was made based on the above circumstances. A lock release pin is provided on the side surface of the switch case so that it can move forward and backward, and a stopper piece that has a biasing force in the direction of the lock release pin is provided on the top surface of the operator. a tongue portion that abuts the lock release pin on a side portion; and a locking protrusion that can abut the front surface or inner surface of the case when the switch mechanism is in the on or off state on the top surface; By providing a guide groove in which the locking protrusion can be inserted when the lock release pin is pressed, the shape of the operator can be simplified, the stopper piece can be easily assembled, and off-lock and on-lock can be easily performed. The object is to provide a trigger switch that can be operated reliably.

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 1 to 5, reference numeral 11 denotes a switch case, from the front of which a drive shaft 13 of a trigger-type operator 12 protrudes so as to be able to slide forward and backward.

A coil spring 14 is installed inside the switch case 11 between the inner end surface of the drive shaft 13 and the inner surface of the case, and the spring 14 urges the drive shaft 13 in the projecting direction.

Further, a locking step 15 is formed on the drive shaft 13, and the step 15 and a protrusion inside the switch case 11 lock together to define the protruding position of the drive shaft 13.

Furthermore, a recess is provided at the inner end of the drive shaft 130 case.
An operating pin 18 is inserted into this recess via a coil spring 17.
The base of the is inserted.

The tip end surface of the operating pin 18 can slide on the upper surface of the movable contact piece 19, and supports the support base 19□, the fixed contact 20.21, the external connection terminal 22. 23 and the like are appropriately arranged to form the trigger switch body.

Further, a guide groove 24 having a predetermined width is provided in the switch case 11 from the front surface thereof along the upper surface of the drive shaft 13.

Furthermore, a lock release button 25 is attached to the side surface of the switch case 11 and protrudes so as to be freely advanced and retracted.

A lock release pin 26 is provided inside the case of this lock release button 25, and a lock release pin 26 is provided on the inside of the case of the lock release button 25.
A coil spring 27 is interposed between the lock release button 25 and the lock release button 25, and the coil spring 27 urges the lock release button 25 in the projecting direction.

On the other hand, a guide pin 28 is provided on the upper surface of the operator 12, and a protrusion 29, for example, is provided on the upper surface of the operator near the guide pin 28.

Further, the intermediate portion of a stopper piece 30 made of, for example, plastic is rotatably attached to the guide pin 28.

The end portion of the stopper piece 30 on the switch case side can move forward and backward into the case 11.

Furthermore, a locking protrusion 3 is provided on the upper surface of the switch case side end.
1 is provided, and the lock release pin 2 is also provided at this end.
At the end of the 6th side there is a 1st. Second tongues 32 and 33 are provided spaced apart by a predetermined distance.

Further, the end portion of the stopper piece 30 in the direction in which the operator protrudes is formed to have elasticity, and this end portion is connected to the protruding portion 2.
It is pressed against the inner surface of 9.

However, the end of the stopper piece 30 on the switch case side is constantly biased in the direction of the lock release pin 26 about the guide pin 28 due to the elasticity of the end on the side in the direction in which the operator protrudes.

Further, a first recess 34 is provided on the inner wall surface of the switch case 11 in which the opening and the lock release pin 26 are provided, and a first recess 34 is provided in correspondence with the lock release pin 26, and is spaced a predetermined distance from the recess 34 in the operator retraction direction. A second four portion 35 is provided on the same inner wall surface.

Note that the first recess 34 can be omitted if the dimensional relationship of the lock release pin 26, the first tongue 32, etc. is changed appropriately.

In the above configuration, when the operator 12 is in the protruding position as shown in FIG. 1, the switch mechanism is in the OFF state.

In this state, the first tongue portion 32 of the stopper piece 30
is brought into contact with the distal end surface of the lock release pin 26, and the locking protrusion 3
The end face on the side in the operator retraction direction of No. 1 is located at a position not facing the guide groove 24.

Therefore, even if a force in the pulling direction is applied to the operator 12, the locking protrusion 31 of the stopper piece 30 comes into contact with the front surface of the case 11, so the operator 12 is not pulled in and is locked in the off state.

Next, when turning on the switch, first push the lock release button 25 in the backward direction.

As a result, the first tongue 32 of the stopper piece 30 is pressed by the lock release pin 26, and the end of the stopper piece 30 on the switch case side presses the guide pin 28 against the elastic force of the end on the side in the operator protrusion direction. Rotate around the center.

In this state, as shown in FIG. 4, the locking protrusion 31 of the stopper piece 30 faces the guide groove 24, so that the operator 12 can be pulled in.

Therefore, in this state, when the operator 12 is pulled in against the biasing force of the coil spring 14, the locking protrusion 31 passes through the guide groove 24 and enters the switch case 11, and at the same time, the tongue portion 32 moves into the switch case 11. slides on the inner wall surface.

That is, the lock release pin 26 is located on the same plane as the inner wall surface of the switch case 11 when the lock release button 25 is pushed in.

Then, with the operator 12 in the retracted position as shown in FIG. 5, the switch mechanism is turned on.

In this state, the second tongue portion 33 is in contact with the distal end surface of the lock release pin 26.

When the pressing force of the lock release button 25 is released in this state, the case side end of the stopper piece 30 is rotated in the direction of the lock release pin 26 by the biasing force of the end on the side in the protruding direction of the operator. The tongue 32 enters the second recess 35 .

Therefore, the end surface of the locking protrusion 31 of the stopper piece 30 on the operator protruding side is not opposed to the guide groove 24 as shown in FIG. The on state is locked by contacting the inner wall surface of the front part of the case 11.

Next, the on-lock state is released by pressing the lock release button 25 again.

That is, when the lock release button 25 is pressed to the retreat position,
The second tongue portion 33 is pressed by the lock release pin 26,
The stopper piece 30 is rotated against the elastic force of the end on the protruding side of the operator.

As a result, the contact between the locking protrusion 31 and the inner wall surface of the switch case 11 is released, and the locking protrusion 31 is brought into contact with the guide groove 2.
4 is faced.

In this state, the operator 12 is driven in the protruding direction by the coil spring 14, and the locking protrusion 31 is inserted into the guide groove 24.
Go through it and exit the switch case 11.

Then, when the pressing force on the lock release button 25 is released, the off-lock state shown in FIG. 1 is restored.

According to the embodiment described above, the stopper piece 3 is attached to the operator 12.
0, and a locking protrusion 31 provided on this stopper piece 30.
is brought into contact with the switch case 11 for off-locking and on-locking.

Therefore, since the contact area can be increased, off-lock,
On-lock can be performed reliably.

Further, the first stopper provided on the stopper piece 30 is used to set and release off-lock and on-lock. Second tongue 32.3
3. The lock release pin 26 provided on the case 11 and the first
．． This is done by the second recess 34°35.

These mechanisms have a simple structure and a small number of parts, so they are easy to assemble.Moreover, the stopper piece 30, the switch case 11 and the operator 12 are simple in shape, so they can be easily molded.

Furthermore, since the structure is simple, there is no risk of mechanical failure and the reliability is high.

In addition, the off-lock and on-lock operations can be performed simply by pressing the lock release button 25 provided on the side surface of the switch case, and the operator can easily perform the operation with only one hand, resulting in extremely good operability.

Next, another embodiment will be described.

In FIG. 6, the end of the stopper piece 30 in the direction in which the operator protrudes has rigidity, and an extension coil spring 40, for example, is interposed between this end and the inner surface of the protrusion 29.

Thereby, the end portion of the stopper piece 30 on the front side of the switch case receives a rotational biasing force in a direction facing the lock release pin 26 about the guide pin 28 .

In addition, in FIG. 7, one end of a U-shaped leaf spring 50, for example, is locked to the end of the stopper piece 30 in the operating projection direction, and the other end of the leaf spring 50 is fixed to the inner surface of the protrusion 29. It is attached opposite to the step provided in the.

Therefore, due to the biasing force of the spring 50, the end of the stopper piece 30 on the front side of the switch case is pressed against the guide pin 2.
The lock release pin 26 is designed to receive a rotational biasing force in a direction opposite to the lock release pin 26 with the lock release pin 8 as the center.

Furthermore, as a holding structure for the leaf spring 50, one end of the leaf spring may be fixedly held on the upper surface of the operator 12, and the other end may press the stopper piece 30. A coil spring may be inserted to apply a biasing force to the stopper piece 30, and this sliding has the advantage that the protrusion 29 can be omitted.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

As detailed above, according to this invention, the structure and assembly are simple, off-locking and on-locking can be performed,
It is possible to provide a trigger switch that is extremely advantageous in practice when installed in a power tool or the like.

[Brief explanation of drawings]

FIG. 1 is a top view showing an embodiment of the trigger switch according to this invention, FIG. 2 is a sectional view taken along line I-I in FIG. 1,
3 is a sectional view taken along line II-II in FIG. 1, FIGS. 4 and 5 are top views showing different operating states of FIG. 1,
6 and 7 are top views showing other embodiments of the stopper piece shown in FIG. 1. 11... Switch case, 12... Operator, 13... Drive shaft, 14... Coil spring, 24... Guide groove, 26...
...Lock release pin, 27...Coil spring,
28... Guide pin, 30... Stopper piece, 31... Locking protrusion, 32.33...
...First. Second tongue, 34.35...first
．． Second recess.

Claims (1)

[Scope of utility model registration request] The drive shaft of the retraction operator protrudes from the front of the switch case so that it can move forward and backward, and a spring is provided inside the switch case to bias the drive shaft in the protrusion direction. a trigger switch body equipped with a switch mechanism that is controlled to switch between states; a lock release pin penetrating through the side surface of the switch case so as to be freely retractable; a coil spring that biases the lock release pin in a protruding direction; a protrusion whose intermediate portion is rotatably held by the guide pin, whose end on the switch case side is located inside the switch case, and whose end on which the operator protrudes is provided on the upper surface of the operator; a stopper piece that receives a biasing force that causes the switch case side end to rotate in the direction of the tip surface of the lock release pin inserted into the switch case about the guide pin, and the case side of this stopper piece. A first tongue portion is provided on the end-side portion and comes into contact with the tip end surface of the lock release pin in the operator protruding position, and a first tongue portion is provided on the upper surface of the case side end of the stopper piece when the operator is in the retracted position or a retaining protrusion that is in a protruding position and that allows the lock release pin to abut on the front surface or inner surface of the switch case in the protruding position; a guide groove provided along the top surface and through which the locking protrusion can be inserted when the lock release pin is in the entry position; and a guide groove provided on the inner side surface of the switch case and located in the operator force field 1 insertion position, and the lock A recess in which the first tongue is accommodated when the release pin is in the protruding position, and the lock is released in a position where the first tongue is accommodated in the recess provided at the case side end of the stopper piece. A trigger switch characterized by comprising a second tongue part that comes into contact with the tip end surface of the pin.