JP2002025392A - Trigger switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trigger switch with small number of parts and excellent assembly property. SOLUTION: A turning body 9 is turnably combined with a switch main body 1 and a trigger member 2, respectively. Spring holding members 7 is formed at the switch body 1 and the trigger member 2, and a spring is arranged between the both spring holding members. With this, the trigger member 2 is biased toward the side of an off-lock position P1 against the switch body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger switch used for a power tool or the like.

[0002]

2. Description of the Related Art Conventionally, for example, the following has been proposed as a trigger switch used for an electric tool such as a grinder.

In a trigger switch described in German Patent No. 3638952, as shown in FIG. 6, a trigger member 102 is attached to a support shaft 101 provided on a switch body 100.
Is rotatably and slidably provided through a guide hole 103 at one end thereof. A guide pin 104 is provided at the other end of the trigger member, and the guide pin 104 is guided to each position of a guide receiving portion 105 provided on the switch body 100. Force is applied to the trigger member 102 in two directions substantially orthogonal to each other by two springs 106 and 107. Thereby, by moving the trigger member 102 toward and away from the switch body 100 to move the switch to an ON position where the switch is turned ON and an OFF position where the switch is turned OFF, and by sliding the switch in parallel,
Positioning is possible between an on-lock position for maintaining the on-state and an off-lock position for maintaining the off-state.

In the trigger switch disclosed in Japanese Patent No. 2783621, a trigger member is rotatably provided at an end of a rotatable member rotatably provided on a switch body. And two orthogonal by two springs
The configuration in which the biasing force acts in the direction and can be positioned at the on-lock position or the like is the same as that of the trigger switch.

[0005]

However, in the trigger switch, two springs 106 and 107 are used.
And the switch body 100 and the trigger member 102 must be provided so that they can be urged. These are very difficult to assemble because they have different biasing directions.

Accordingly, an object of the present invention is to provide a trigger switch having a small number of parts and excellent in assemblability.

[0007]

According to the present invention, as a means for solving the above-mentioned problems, a trigger member is provided on a switch body, and an ON position for turning on a switch provided on the switch body, and an OFF state. A trigger switch having a guide mechanism capable of being positioned between an on-lock position for maintaining an on-state and an off-lock position for maintaining an off-state. The pivot member is rotatably connected to the trigger member, a spring holding portion is formed on the switch body and the trigger member, and a spring is disposed between the two spring holding portions, whereby the trigger member is connected to the switch body. Are biased toward the off-lock position.

According to this configuration, unless the trigger member is moved in parallel with the switch body, it is positioned at the off-lock position by the biasing force of the spring and cannot be pushed toward the switch body. Then, when the trigger member is slid against the urging force of the spring, it can be pushed into the switch body and the switch can be turned on. Further, when the trigger member is further operated in the ON state, the positioning can be performed at the ON lock position.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a trigger switch according to the present embodiment. This trigger switch has a configuration in which a trigger member 2 is operably provided on a switch body 1.

The switch body 1 turns on / off a switch (not shown) disposed on the rear side via an operating body 3 protruding toward the front side of the central portion. The operating body 3 protrudes through a waterproof cover 4, and an operation pin 3 a protruding in a direction orthogonal to the distal end thereof is provided. In addition, as a switch that can be used, a so-called self-holding type in which a movable contact piece (not shown) is positioned at an ON position or an OFF position by the operating body 3 can be used.

On the front surface on the upper end side of the switch body 1, a support portion 6 having a guide pin 5 at its tip protrudes. Further, a spring holding portion 7 is protrudingly provided near a lower portion of the support portion 6.

A recess 8 is formed in the front surface on the lower end side of the switch body 1, and a rotating body 9 is rotatably mounted therein. The concave portion 8 is formed with a connecting concave portion 10 on the opposing surface, and regulates the rotation range of the rotating body 9 by the two inclined surfaces 8a and 8b.

As shown in FIG. 2, the rotating body 9 has a structure in which one end of a side-by-side rotating plate 11 is connected by a connecting shaft 12, and can be easily formed by integral molding. Connecting portions 11a and 11b are provided on the outer surfaces of both ends of each rotating plate 11, respectively. Connection part (first connection part) 1 on one end side
1a is rotatably engaged with the coupling hole 13 of the trigger member 2, and the coupling portion (second coupling portion) 11b at the other end is rotatably engaged with the coupling recess 10 of the switch body 1.

As shown in FIG. 1, the trigger member 2 gradually inclines rearward as the upper half of the front surface rises upward, and protrudes forward again at the upper end. The trigger member 2 is
A connection hole 13 is formed in both side surfaces of the lower end, and the first connection portion 11a of the rotating body 9 is rotatably connected to the connection hole 13. Thereby, the trigger member 2 is connected to the second connecting portion 11b.
Is pivoted about the first connecting portion 11a of the rotating body 9 that pivots around the center, so that the trigger member 2 can move not only in contact with or away from the switch body 1 but also in a direction along the front surface thereof.

A concave operation portion 14 is provided on the center of the trigger member 2 at the side wall facing surface. As shown in FIG. 3, the operating section 14 includes a pushing surface 14a for pushing the operating body 3 into the switch main body 1, and a pull-up surface 14b for pulling up the pushed operating body 3. In the vicinity of the upper part of the operation part 14, a spring holding part 15 is protrudingly provided on the inner surface facing the front surface of the switch body 1. A spring 16 is provided between the spring holding portion 15 and the spring holding portion 7 of the switch body 1.

As shown in FIG. 3, continuous guide grooves 17 are formed on both side surfaces of the upper end of the trigger member 2. The guide groove 17 extends downward from the off-lock position P1 to reach the off-position P2, extends to the left from the off-position P2 to reach the on-position P3, and from the on-position P3 to the on-lock position via the lock receiving portion 18. It is formed in a crank shape reaching P4.

Next, a method of assembling the trigger switch will be described. First, the operating body 3 is protruded from the center of the front surface of the switch body 1 via the cover 4, and the operating pin 3a
Is fitted. The rotating body 9 is provided in the recess 8 of the switch body 1.
And the second connecting portion 11b is rotatably connected to the connecting concave portion 10.

Subsequently, the connecting hole 13 of the trigger member 2
First connecting portion 11 of rotating body 9 attached to switch body 1
a. At this time, a spring 16 is provided between the spring holding portion 7 of the switch body 1 and the spring holding portion 15 of the trigger member 2, and the operating pin 3 a of the operating body 3 protruding from the switch body 1 is connected to the operating portion 14. Engages. Thus, the operation of assembling the trigger switch is completed.

As described above, according to the trigger switch, the trigger member 2 is connected to the switch body 1 via the rotating body 9.
After connecting the two, a single spring 1
6, the assembly work can be performed simply and efficiently.

The assembled trigger switch is applied to a power tool such as a grinder, for example, and operates as follows.

When the trigger member 2 is not operated, the trigger member 2 is urged obliquely downward from the front surface of the switch body 1 by a spring 16 as shown in FIG. The trigger member 2 is, as described above,
It is rotatably connected to a rotating body 9 rotatably connected to the switch body 1. Therefore, the trigger member 2 is
The rotating body 9 that rotates in the counterclockwise direction around the second connecting portion 11b rotates in the counterclockwise direction about the first connecting portion 11a. As a result, the guide pin 5 is positioned at the off-lock position P1 of the guide groove 17, and the operating body 3 is pulled up by the pull-up surface 14b, so that the trigger switch is in the off-lock state. In this state, simply applying a force so that the trigger member 2 approaches the switch body 1 will cause the guide pin 5 to move to the off-lock position P.
Since the switch cannot be moved from 1 to the off position P2 which can be moved to the on position P3, the switch does not enter the on state.

The switch body 1 is operated by operating the trigger member 2.
When a force is applied in the upward direction along the axis, as shown in FIG. 4B, the guide pin 5 locks the guide groove 17 in the off-lock position P1.
To the off position P2. Therefore, the trigger member 2 does not approach the switch body 1 and
After the guide pin 5 reaches the OFF position P2 after moving in parallel with the switch main body 1 according to the turning operation of, the switch main body 1 can be approached. Therefore, when the trigger member 2 is moved closer to the switch body 1 against the urging force of the spring 16, as shown in FIG. 4C, the operation body 3 is pressed by the operation part (pressing surface 14a) of the trigger member 2. It is pushed into the main body 1. Then, as shown in FIG. 5A, when the guide pin 5 reaches the ON position P3, the switch is turned on, and the electric tool is driven.
At this time, the biasing direction of the movable contact piece of the switch changes so that the contact is maintained in the on state even when the force applied to the operating body 3 is removed.

At this point, when the force on the trigger member 2 is removed, the guide pin 5 returns from the on position P3 to the off position P2 by the urging force of the spring 16. For this reason, the operating body 3 is forcibly pulled up by the pulling upper surface 14b formed on the operating portion 14 of the trigger member 2, and the switch is maintained in the off state. That is, at this stage, the switch can be turned on / off by applying a force to the trigger member 2 or removing the force. When the applied force to the trigger member 2 is completely removed at the off position P2, the guide pin 5 moves to the off lock position P1 by the urging force of the spring 16, and the trigger switch returns to the off lock state.

After the guide pin 5 reaches the ON position P3,
Further, when an upward force is applied to the trigger member 2 along the switch body 1, the trigger member 2 moves upward against the urging force of the spring 16, and the rotating body 9 continues to rotate. For this reason, the trigger member 2 approaches the switch main body 1 while rotating along with the rotating operation of the rotating body 9. Therefore, as shown in FIG. 5B, the guide pin 5 easily passes over the locking receiving portion 18 from the ON position P3.

At this point, when the force on the trigger member 2 is removed, the trigger member 2 is moved by the urging force of the spring 16 as shown in FIG.
The guide pin 5 is locked to the locking receiving portion 18 by the urging force of the above. After the guide pin 5 is positioned at the on-lock position P4, the switch is maintained in the ON state, so that it is not necessary to apply an extra force to the trigger member 2.

As described above, according to the trigger switch, in consideration of the movement of the guide pin 5 obtained from the turning operation of the trigger member 2 accompanying the turning operation of the turning member 9, the guide groove 17, especially the ON position Since the movement path from P3 to the on-lock position P4 is formed, the operability is very good.

On the other hand, when releasing the on-lock state, the trigger member 2 is moved upward along the switch main body 1, and the guide pin 5 is dropped from the locking receiving portion 18 by the urging force of the elastic body. And it is sufficient. This allows
The guide pin 5 reaches the lock position P3 by the biasing force of the spring 16, and reaches the off position P2 and further to the off lock position P1 by removing the force applied to the trigger member 2.

In the above-described embodiment, the guide receiving portion 17 having the guide groove 17 is provided on the trigger member 2 and the guide pin 5 is provided on the switch main body 1, respectively. .

Further, in the above-described embodiment, a self-holding type switch is used, but a self-returning type switch may be used. However, in this case, while the guide pin 5 moves from the ON position P3 to the ON lock position P4, not only the operation pin 3a is not pushed in but also the movable contact piece of the switch. It is necessary to configure so as not to be pushed back by the spring force.

[0030]

As is apparent from the above description, according to the present invention, the trigger member is biased toward the off-lock position by a single spring disposed between the trigger member and the switch body. The number of parts is small,
Excellent assemblability.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a trigger switch according to an embodiment.

FIG. 2 is a perspective view of the rotating body shown in FIG.

FIG. 3 is a partial sectional view of the trigger member shown in FIG. 1;

FIG. 4A is a cross-sectional view showing an off state of the trigger switch of FIG. 1, a cross-sectional view showing a state where the trigger member is moved upward therefrom, and further, the trigger member is directed toward the switch body. FIG. 5C is a cross-sectional view illustrating a state in which the cover is being pushed in by pushing.

5A is a cross-sectional view showing the ON state of the trigger switch of FIG. 1, FIG. 5B is a cross-sectional view showing a transition from the ON-lock state, and FIG. 5C is a cross-sectional view showing the ON-lock state.

FIG. 6 is an exploded perspective view of a trigger switch according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Switch body 2 ... Trigger member 3 ... Operation body 5 ... Guide pin 7, 15 ... Spring holding part 9 ... Rotating body 14 ... Operation part 16 ... Spring 17 ... Guide receiving part 18 ... Guide groove 19 ... Lock receiving part

Claims (1)

[Claims] 1. A switch member provided with a trigger member, wherein a switch provided on the switch body can be moved between an on position for turning on and an off position for turning off, and an on state for keeping the switch on. A trigger switch including a guide mechanism capable of being positioned between a lock position and an off-lock position for maintaining an off state, wherein a rotating body is rotatably connected to the switch body and the trigger member, respectively. A trigger holding member is biased toward an off-lock position with respect to the switch body by forming a spring holding portion between the spring member and the trigger member, and disposing a spring between the spring holding portions. .