JP2847956B2 - Trigger switch - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger switch used for controlling an electric tool such as an electric drill, and more specifically, a push operation stroke of a trigger operation member can be variably adjusted. It is related to trigger switch.

<Prior art and its problems> Conventionally, as a trigger switch of this type, an output corresponding to each displacement of a pushing operation stroke of a trigger operation member is variably controlled, and an effective set value of the operation stroke is varied. Is known.

That is, a stroke adjuster is provided on the operating member,
An adjusting table is connected to a screw portion formed on the adjusting element via a screw mechanism, and the adjusting table is displaced back and forth by rotation of the adjusting element to variably control an effective stroke of the operating member. It has been known.

However, according to the above configuration, the adjuster pivots delicately due to vibration of the power tool or the like, and the adjustment base screwed into the adjuster is displaced in the axial direction, and the effective stroke of the operation member is adjusted to a fixed value. Not only is it extremely difficult to hold the actuator, the structure is complicated and the number of parts is large, and the variable speed control of the stroke requires a large number of rotations of the adjuster, making the rotation operation extremely troublesome. is there.

<Object of the Invention> The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a trigger switch capable of simplifying a structure and improving operability.

<Structure and Effect of the Invention> The trigger switch according to the present invention has a plurality of steps formed at the inner end of a stroke adjuster supported by the operating member so as to be pivotable and non-movable with respect to the axis. A stop that abuts against the step of the adjuster at a predetermined pushing position is protruded from the switch case, and is rotated by a plurality of locking grooves formed in the operating member for each predetermined turning position of the adjuster. A stopper is protruded from the adjuster, and a click claw that is in sliding contact with a fine uneven surface formed between the locking grooves is protruded from the knob.

According to the above configuration, the set position of the plurality of steps of the adjuster with respect to the stopper can be changed by rotating the stroke adjuster one pitch at a time, whereby the maximum pushing of the operating member can be performed. The operation stroke is regulated to the set predetermined value, and the maximum output is regulated and controlled to the predetermined value, so that the control is stabilized.

In the adjuster, a rotary stopper protruding from the inner surface of the knob portion is fitted into a plurality of locking grooves, and the rotary stopper is locked in each of the locking grooves for each predetermined turning position,
The turning position of the shaft portion of the adjuster with respect to the operation member is regulated. Therefore, the effective stroke of the operating member can be maintained at the adjusted constant value without the adjuster turning delicately due to vibration of the power tool or the like.

In addition, the click claw protruding from the knob portion slides on the fine uneven surface when turning the knob portion around the axis, so that a light click feeling can be obtained. In addition, since the knob, the plurality of steps, the rotary stopper and the click claw, which achieve these functions, are formed integrally with the adjuster, the structure is simple, the number of parts is small, and the manufacturing and assembly are easy. In addition, when the variable control of the stroke is performed, the number of rotations of the adjuster is one, and the rotation operation is extremely easy.

<Description of Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an example of a trigger switch according to an embodiment of the present invention, and FIG. 2 is a transverse sectional view of the switch.

In FIG. 1, a switch case 1 includes, for example, a container-shaped case main body 2 and a terminal base 3 fixed to a lower side of the case main body 2. On one side of the switch case 1, a trigger operating member 5 is held so as to be able to be pushed in the pushing direction (the direction of arrow a).
Is a shaft 5a inserted into the guide hole 4 formed in the switch case 1, and a push button protruding from the outer end of the shaft 5a.
5b and a boss 5c protruding from the inner end of the shaft 5a.

A lower part of the inner end surface of the boss portion 5c is formed with a spring storage recess 5h that is opened inward in the axial direction. One end of the return spring member 21 is stored in the storage recess 5h, and the other end is formed. It is pressed against the inner wall of the case body 2 and always returns in the return direction (arrow b).
Direction). As shown in FIG. 3, a guide groove 5 g extending in the axial direction is formed on the inner end boss portion 5 c of the operation member 5, and a plate-shaped protrusion protruding from the inner wall of the case body 2. Stopper 2a is the above guide groove
The operation member 5 is slidably fitted into 5g, and is held so as not to turn around the axis and to be able to move axially.

An adjuster 14 for adjusting the pushing stroke is coaxially fitted to the shaft 5a of the operation member 5, and the adjuster 14 is fitted to a shaft hole 5d formed in the shaft 5a of the operation member 5. And a disc-shaped knob 14b protruding from a front end of the shaft 14a. The knob 14b is formed on a front end face of the operation member 5 and is provided with a knob housing. It is stored in the recess 5e.

An annular stopper projection 14c protrudes from a shaft portion 14a of the adjuster 14, and the stopper protrusion 14c is locked by press-fitting into a locking groove 5f formed in a radial direction from the shaft hole 5d of the operation member 5. Being
The front end of the operating member 5 is rotatably sandwiched between the knob portion 14b and the retaining protrusion 14c, so that the operation member 5 is prevented from coming off in the axial direction. A rotary stopper 14e protrudes from an inner surface 14d (FIG. 4) of the knob portion 14b, and an inner surface 5i (FIG. 5) of the knob housing recess 5e facing the rotary stopper 14e.
A plurality of locking grooves 23 (23a to 23n) into which e is fitted are engraved, and the knob 14b is turned around an axis, and the rotating stopper 14e is turned into a plurality of locking grooves 23 at each predetermined turning position. And the turning position of the shaft portion 14a of the adjuster 14 with respect to the operation member 5 is regulated.

A click claw 14 is provided on the inner surface 14d of the knob 14b.
f is projected, and a fine uneven surface 24 on which the click claw 14f slides is engraved between the locking grooves 23, and the knob portion 14b
Clicking the click nail when turning the
It is configured so as to be obtained by a sliding contact operation between 14f and the fine uneven surface 24.

At the inner end of the shaft portion 14a of the adjuster 14, a plurality of step-shaped steps 22 (22a to 22n) are formed around the axis thereof, and each step 22 has a predetermined interval in the axial direction. Thus, it is disposed opposite to the stopper 2a so as to be able to approach and separate therefrom.

The base 3 has an L-shaped common fixed terminal piece 6B made of a rigid conductor, a movable contact piece 7B whose center portion is rotatably supported by a support portion 6b of the common fixed terminal piece 6B, and a movable contact piece 7B.
A fixed contact where the movable contact 8B provided at the tip of 7B comes and goes.
The fixed terminal strips 10B having 9B set therein are sequentially arranged along the pushing operation direction a of the operation member 5.

Elastic holding pieces 15 and 16 for connecting external lead wires are disposed opposite to the fixed terminal pieces 6B and 10B, respectively, and these are inserted from external lead wire insertion holes 17 and 18 formed in the switch base 3. One-touch connection of external lead wires (not shown) is also possible.

A slider 12 that slides in contact with the base end of the movable contact piece 7B is axially fitted into a holding hole 5i formed below the inner end boss 5c of the operation member 5. The slider 12 is elastically held by a compression spring 13.

When the operation member 5 is pushed in the pushing direction a and the slider 12 passes through the support portion 6b of the common fixed terminal 6B, the movable contact piece 7B rotates and a movable contact provided at the distal end thereof. 8B contacts the fixed contact 9B and becomes conductive. By this,
A second switch B described later is configured.

As shown in FIG. 2, a first switch A having the same configuration as that of the second switch B is provided on the base 3, and the operation member 5 is pushed into the first switch A in the direction a. In the initial state, the movable contact piece 7A rotates so that the movable contact 8A provided at the tip thereof contacts the fixed contact 9A to conduct.

A printed circuit board 25 is fixed inside the switch case 1 as shown in FIG. 2, and a power element with a control electrode for supplying a large current, for example, a triac
The triac 26 is connected in parallel with the second switch B of the trigger switch C as shown in FIG. 6, and the input terminals P1 and P2 to which the power supply E is connected are connected to the first and second switches. The output terminals Q1 and Q2 to which the load Z is connected consist of the common fixed terminal pieces 6A and 6B of A and B, respectively, and the fixed terminal pieces 10A and 10B of the first and second switches A and B.

Further, a variable resistor 27 is connected to the printed wiring board 25, and the variable resistor 27 is provided so as to be interlocked with the operating member 5, and the variable resistor 27 is pushed as the operating member 5 is pushed in the direction a. The resistance value is increased, the ignition timing of the triac 26 is controlled via the control circuit 28, and the output from the output terminals Q1, Q2 is sequentially increased.

 Next, the operation of the above configuration will be described.

When the operating member 5 is not pushed, each movable contact piece 7
The movable contacts 8A and 8B of A and 7B are released from the fixed contacts 9A and 9B,
Since the first and second switches A and B are open, power is not supplied from the power source E to the load Z.

In this state, when the operation member 5 is pushed in the direction a against the spring force of the return spring 21, first the first switch A
Is closed and power is supplied from the power source E to the load Z via the triac 26. As the pushing stroke of the operation member 5 increases, the variable resistor 27 is supplied.
, The ignition timing of the triac 26 is controlled via the control circuit 28, and the output voltage e from the output terminals Q1 and Q2 turns on the first switch A as shown in FIG. It increases sequentially from point S1.

That is, each output voltage e2,... Em− corresponding to each displacement S2,... Sm−1, Sm, Sn of the pushing operation stroke S of the operation member 5.
1, em, en can be obtained variably.

When the step 22 of the adjuster 14 is set at a position where the operating member 5 has the maximum operation stroke Sn, that is, when the stroke adjuster 14 is in the setting state shown in the drawing, the shaft of the adjuster 14 is set. Since the step 22n formed at the inner end of 14a is disposed opposite to the stopper 2a at a predetermined interval in the axial direction, when the operating member 5 is pushed to the position of the maximum operating stroke Sn, When the second switch B is closed at the position of the operation stroke Sn-1, the supply of power from the power source E to the load Z is controlled by the ignition of the triac 26 without passing through the triac 26. Instead, it is done directly via the second switch B, in which case the maximum output voltage is en.

On the other hand, the stroke adjuster 14 is turned by one pitch in the direction of arrow c in FIG. 3 to set the operation member 5 at the position where the operation stroke Sn-1 is set, and the step portion 22 of the adjuster 14 is set. That is, the step 22 of the stroke adjuster 14
When n-1 is disposed to face the stopper 2a, the pushing operation of the operating member 5 stops at the operating stroke Sn-1, and the second switch B is not closed.
Therefore, in this case, the maximum output voltage supplied from the power supply E to the load Z is en-1.

Further, the stroke adjuster 14 is rotated by one pitch in the direction of arrow d in FIG. 3 so that the operation member 5 is positioned at the operation stroke S2, that is, the step 22a of the stroke adjuster 14 is opposed to the stopper 2a. In this state, the pushing operation of the operation member 5 is stopped at the operation stroke S2, and the second switch B is not closed. The output voltage becomes e2.

According to the above configuration, the stroke adjuster 14 is turned one pitch at a time in the directions of arrows c and d in FIG. 3 so that the set positions of the plurality of steps 22 of the adjuster 14 with respect to the stop 2a can be changed. Accordingly, the maximum pushing operation stroke S of the operation member 5 is regulated to the set predetermined value, and the maximum output voltage supplied from the power source E to the load Z is regulated to the predetermined value. Thus, the control of the load Z is stabilized.

The adjuster is provided with a knob 14b protruding from the shaft 14a.
The rotation stopper 14e protrudes from the inner side surface 14d of the knob 14b. The front end of the operation member 5 is rotatably sandwiched between the rotation stopper 14e and the stopper 14c. The rotary stopper 14e is fitted into the locking groove 23, and the rotary stopper 14e is locked in the locking groove 23 at each predetermined turning position, and the turning position of the shaft portion 14a of the adjuster 14 with respect to the operating member 5 is regulated. You.

Therefore, it is easy to maintain the effective stroke S of the operation member 5 at the adjusted constant value without delicate turning due to vibration of the power tool or the like.

Further, the click claw 14f protruding from the inner side surface 14d of the knob portion 14b slides on the fine uneven surface 24 when turning the knob portion 14b around an axis, so that a light click feeling can be obtained. In addition, since the plurality of steps 22 that achieve these functions, that is, the parts 14b, the retaining projections 14c, the rotary stoppers 14e, and the click claws 14f are formed integrally with the adjuster 14, the structure is simple. In addition, the number of parts is small, and the number of rotations of the adjuster is one at the time of the variable control of the stroke, and the rotation operation is extremely easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a trigger switch according to the present invention, FIG. 2 is a transverse sectional view of the trigger switch, FIG. 3 is an exploded perspective view of a main part of the trigger switch, and FIG. FIG. 5 is an enlarged perspective view showing a part of the switch, FIG. 5 is an end view showing an enlarged part of the trigger switch, FIG. 6 is an electric circuit diagram for explaining the operation of the trigger switch,
FIG. 7 is a characteristic diagram for explaining the operation of the trigger switch. 1 Switch case, 2a Stopper, 5 Operation member for trigger, 14 Adjuster, 14a Shaft, 14c Locking projection, 14e Rotating stopper, 14f Click nail, 21 …
... Return spring member, 22... Step, 23... Locking groove, 24... Fine uneven surface, C... Trigger switch, S.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuya Tsuge, one of 626 Nishibayashi-machi, Izumo-shi, Shimane Prefecture Inside of Omron Izumo Co., Ltd. (72) Inventor Yasumichi Fukuma 626-1, Nishibayashi-cho, Izumo-shi, Shimane Within Mullon Izumo Co., Ltd. (72) Inventor Katsuhiko Nishida, Kyoto, Kyoto City, Ukyo-ku, Hanazono-Todo-cho, 10 Omron Co., Ltd. 72) Inventor Kenichi Goto 10 Okayama Todo-cho, Ukyo-ku, Kyoto-shi, Kyoto (72) Inventor Takuji Tsuda 10-okahanatodo-cho, Ukyo-ku, Kyoto, Kyoto Omron Corporation (72) Inventor Shinya Hamasaki Omron Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) H01H 13/0 0-13/76

Claims (1)

(57) [Claims] An operation member for a trigger is held in a switch case so as to be able to be pushed in against a return spring force, and the output is sequentially increased with an increase in a pushing operation stroke of the operating member. In a trigger switch having an adjuster for variably controlling a stroke, a plurality of steps are formed at an inner end of a stroke adjuster supported by the operation member so as to be able to pivot and not to move axially,
At a predetermined pushing position of the operating member, a stopper that comes into contact with a step portion of the adjuster is protruded from the switch case, and a plurality of locking grooves formed in the operating member are provided for each predetermined turning position of the adjuster. The rotary stopper to be locked is protruded from the adjuster, and a click claw that slides on a fine uneven surface formed between the locking grooves is protruded from the knob, and the adjuster is pivoted. A trigger switch configured to change a contact position of each step portion of the adjuster with respect to the stop in a state where the position is regulated by turning one pitch at a time around the portion.