JPH04154016A - Trigger switch structure - Google Patents

Abstract

PURPOSE:To carry out safety-and-ON locking with either hand by providing a lock operational button on the frontal part of a trigger, and by operating the lock operational button with index finger. CONSTITUTION:A lock part 46 and an engagement part 5a are provided on the end surface part of a case 21, and a guide hole 53 is provided on the surface part of a trigger 51, while a lock operational button 60 is provided on the guide hole 53 in such a way that the button can be moved, and the base of a lock plate 63 is mounted on the rear part of the button, so as to have the bent part in the middle of the lock plate 63 abutted on the surface part of the trigger 51. An engagement part 64 that is stopped in engagement with an engagement part 50 in such a way that it can be disengaged therefrom at the time of the proceeding of the lock plate 63, on the end part side of the lock plate 63. The lock operational button 60 is moved backward through the energizing power of the spring, while the end part of the lock plate 63 is put to the lock part 46 of the case 21, so as to inhibit the retraction of the trigger 15. A trigger switch structure for carrying out safe-and-ON locking with either hand, can thus be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a trigger switch structure provided in a power tool or the like.

(Prior Art) A conventional tri-structure swing structure of this type includes a case 1 and a cover 1a fitted to the case 1, as shown in FIGS. 17 to 19. , line up terminal 2 on Ijll in the operating direction of the operating button described later.
．． 3 is provided, and the terminal 2 is provided with a fulcrum portion 4,
′! A fixed contact 5 is attached to the IA element 3. i child 2
The fulcrum portion 4 swingably supports a movable piece 6, and a movable contact 7 is provided at the end of the movable piece 6. Furthermore, a guide piece 8 is provided protruding from the end face of the case 1. A guide piece 9 is provided protruding from the end of the cover 1a. Further, an operating shaft 10 is slidably inserted into the cover la, and an operating button (trigger) 11 is provided at the tip of the operating shaft 10. A guide portion 12.13 is formed on the operation button 11, and a guide piece 8.9 is in sliding contact with the guide portion 12.13. A return spring 14 is interposed between the scene part of the operation column 10 and the ground part of the cover 1a. A slider insertion portion 15 is formed on the operating shaft 10, and a base portion of an operation spring 16 and a slider 17 are inserted into the slider insertion portion 15.
The slider 17 is urged toward the movable piece 6 by the operation spring 16, and its end portion is in sliding contact with the movable piece 6. Further, the cover 1a is provided with a lip mechanism 18. This locking mechanism 18 is connected to a cylindrical portion 1 protruding from the left side surface of the cover 1a.
8a, a reset button 19 is inserted into this cylindrical portion 18a, and a spring 19a is housed in the cylindrical portion 18a. Also,! ! A lock plate 20 is attached to the actuator 10, and this opening plate 20 is provided with an opening part 20a.

In the state shown in FIG. 17, the slider 17 is in sliding contact with the end 6a of the movable piece 5, and this end 6a is brought into contact with the surface of the terminal 2.

From this state, by pulling the operation button 11 with your finger, the operation shaft 10 is moved against the return spring 14, and the slider 17 is slid on the sliding surface of the movable piece 6 to move the slider 17. The movable piece 6 is positioned on the movable contact 7 side of the piece 6, and the movable piece 6 is swung about the fulcrum portion 4 to bring the movable contact 6 into contact with the fixed contact 5. In this state.

By drilling the reset button 19 into the spring 19a and pushing it in, the tip of the reset button 19 is inserted into the lock plate 20.
The movable contact 6 is locked with the locking part 20a of the fixed contact 5.
Keep it in contact with.

- [Problem to be solved by the invention] However, in such a conventional technique, since the locking mechanism 18 is located on one side (left side) with respect to the operation button 11, the locking operation can be performed with the right hand; The problem was that it could not be operated with the left hand, making it unusable for people with limited mobility.

The present invention has been made by focusing on the above-mentioned problem, and its purpose is to provide a trigger switch structure that allows convenient safety and ON operation with either the right or left hand. 6. Means to be Solved by the Invention In order to achieve the above object, the present invention provides a movable piece that moves the trigger against a return spring by pulling the trigger. In the case of a trigger switch that switches the movable contact between fixed contacts, a lock part and a stop part are provided on the ground part of the case, a guide hole is provided in the face of the trigger, and a guide hole is provided in the trigger surface. A movable lock operation button is provided, the base of the lock plate is attached to the back of the operation button, the bent part of the middle part of the lock plate is brought into contact with the surface of the trigger, and the end of the lock plate is attached to the back of the operation button. A locking plate side locking part is provided on the side of the lock plate to releasably lock the lock plate side when the lock plate moves forward. It is characterized in that the end of the lock plate is brought into contact with the opening of the case to prevent the trigger from being pulled.

(Function) With this configuration, one index finger can be hooked on the lock operation button, the middle finger can be hooked on the trigger, and one
Move the index finger to move the opening/litter operation button forward against the spring and move the trigger plate forward to release the locking part at the end and pull the trigger. In this state, pull the index finger and middle finger to actuate the trigger against the return spring, and this operation causes the locking protrusion to lock in the locking hole in the mouth/luck plate, and the trigger is in the retracted state. can be locked. In other words, safety and ON locking becomes possible.

In addition, by pulling the trigger again, the locking protrusion is removed from the locking hole of the lock plate, and by releasing the pulling force, the trigger is returned to its original position by the spring force of the return spring, and the lock operation button is released from the spring. The end portion of the lock plate can be locked in the locking portion by being returned by force.

As described above, since the lock operation button is provided on the front surface of the trigger and is operated with the index finger, the safety and ON lock can be conveniently performed with either the right or left hand.

(Example) An embodiment of the present invention will be described below based on the drawings.

Figure 1 shows the I! of the tricycle switch structure according to the present invention. FIG. 2 is an explanatory diagram of a motor drive circuit incorporating the outstanding trigger switch structure of the present invention.

The trigger switch structure according to the present invention includes a case 21 as shown in FIG. 1, and an operating chamber 22 and a spring chamber 23 are formed in the case 21.
．． Reference numeral 23 extends from the left and right sides of the case 21 (in the direction perpendicular to the plane of the drawing). A corner wall 24 is provided between the first operating chamber 22 and the spring chamber 23, and a spring is inserted into this space W24. In one operating chamber 22, in which the sliding hole 25 is formed, a side funnel-shaped operation piece accommodating portion 26a and a contact operating portion 26b are formed. A first fixed contact 27 and a second fixed contact 28 are attached to the contact operating part 26b facing each other, and the first fixed contact 27 is connected to the first connection terminal 29, and the second fixed contact 27 is connected to the first connection terminal 29.
The fixed contact 28 is connected to the second connection terminal 30.

The case 21 has a third connection terminal 31 and a relay terminal 32.3.
3, and the third connection terminal 31 is provided with a spring member 3.
The base of No. 4 is fixed.

That is, this spring member 34 includes a contact portion 34a formed by forming the tip of a plate spring material into a U-shape at its tip portion, and a spring providing portion 34b formed by bending a plate spring material at the opening portion. The contact portion 34a is slidably inserted into the spring sliding hole 25, and the end of the contact portion 34a protrudes into the working chamber 22.

The operating body 35 is housed in the operating body accommodating portion 26a of the working chamber 22. As shown in FIGS. 3 to 5, this operating body 35 has the upper and lower surfaces 36a and 36b of the block body 36 sloped, and a square locking protrusion 37 at the tip of the side surface 36c.
In addition, a pin-shaped projection 37 is provided at the tip of the other side surface 36b.
Al! ! - A funnel-shaped slider accommodating portion 38 is formed inside the block body 36, and a spring receiving portion 38a is further formed at the bottom of this slider accommodating portion 38.

Slider accommodating portion 3 of the operating body 36 configured in this way
A slider 39 is housed in the 8.

As shown in FIG. 6, this slider 39 has a diamond-shaped side surface, and a spring hole 40 is formed from the end to the middle. A spring 41 is provided from the spring hole 40 to the spring receiving portion 38a, and this spring 41 biases the slider 39 in the direction of exiting the slider housing portion 38.

Further, the movable piece 42 is housed in the working chamber 22. This movable piece 42 is bent in a V-shape at its middle part, and its negative side part 42a is bent in an inverted dogleg shape, and this bent part is a contact part 42C, and this contact part 42c
A first slider sliding portion 44 is formed from the end side, and a second slider sliding portion 45 is formed from the contact portion 42c to the bent t=42e side. The tip of the other side 42d of the movable piece 42 is bent, and the movable contact 43 is fixed to this portion.

When this movable piece 42 is housed in the working chamber 22,
The contact portion 34a at the tip of the spring member 34 contacts the contact portion 42c of the movable piece 42, and the tip 39a of the slider 39 contacts the contact portion 42c of the movable piece 42.
The first slider sliding portion 44 of the movable piece 42 is in contact with the spring 41 due to the biasing force, and this movable piece 42 is in contact with the contact portion 3
The movable contact 43 is in contact with the first fixed contact 27 by being biased in the half-clockwise direction using the movable contact 4a as a fulcrum.

Further, a trigger mounting portion 46 is formed on the end surface of the case 1, and the trigger mounting portion 46 has a spring receiving portion 4.
7, a locking portion 48, and a locking protrusion 50 which is a locking portion.

As shown in FIGS. 7 to 12, the trigger 51 includes a trigger body 52 in the form of a cover, and a guide hole 53 is provided in a surface portion 52a of the trigger body 52. A spring locking portion 54 is formed therein. Further, a spring locking portion 49 is provided protruding from the inside of the surface portion 52a. Attachment pieces 55.5 are provided on both sides of the trigger body 52.
6, one mounting piece 55 is provided with a round hole 57, and the other mounting piece 56 is provided with a square hole 58.

The trigger 51 configured in this way has a handle portion 5.
Fitting the locking protrusion 37 of the operating body 35 into the square hole 58 of 6,
The pin-shaped protrusion 37 of the operating body 35 is inserted into the round hole 57 of the mounting piece 55.
a is fitted in the trigger mounting portion 46 of the case 21, and a return spring 73 is interposed between the spring receiving portion 47 of the trigger mounting portion 46 and the four spring receiving portions of the trigger 51. 31 is my mouth...IriI! ! '! fi
It is set at 59. The opening mechanism 159 is equipped with a lock operation button 60 that is attached to the guide hole 53 of the trigger 51 so as to be movable in the left and right direction in the drawing. Figures to 16th
As shown in the figure, a boss portion 61 is formed on the back surface.
A spring locking portion 62 is formed on this boss portion 61 . A base portion of a lock plate 63 is attached to this boss portion 61 with a screw 64. This lock plate 63 is bent at a substantially right angle in its middle part,
This bent portion is the surface portion 52arIIfJ of the trigger body 52.
It's bulging out.

This bulge 11663 a is in contact with the surface portion 52 a 6
A locking hole 64, which is a locking plate side locking portion, is formed on the end 63b side of the mouth/l waste plate 63. Spring locking portion 62 of boss portion 61 and spring locking portion 54 of guide hole 53
A spring 65 is interposed between the mouth and the mouth, and the biasing force of the spring 65 causes the mouth operation button 60 and the mouth! The brake plate 63 is retracted, and the end 63b of the brake plate 63 collides with the locking portion 48, thereby preventing the trigger 51 from being retracted.

The trigger switch structure configured in this way connects the first connection terminal 29 to the motor M and one connection terminal 66a.
is connected to the second connection terminal 30 via a lead wire 67.
is connected to the power source 68 via a lead wire 69, the third connection terminal 31 is connected to the other connection terminal 66b of the motor M via a lead wire 70, and one terminal 32 of the relay terminals is connected to the power source 68. is connected to via a lead wire 71,
The other terminal 33 of the relay terminals is connected to one connection terminal 66a of the motor M via a lead wire 72, and is incorporated into the circuit of the motor M. Therefore, this trigger switch structure is often attached to a grip (not shown) of a power tool.

Next, I will explain the operation. Grasp the grip with your hand and place your index finger 74 on the lock operation button 6.
0 and the middle finger 75 to the trigger 51.

Then, by moving the index finger 74, the lock operation button 60 is moved in the direction of the arrow in FIG. do.

In this state, by pulling the index finger 74 and middle finger 75, the trigger 51 is actuated against the return spring 73.

As a result of this operation, the opening/cup plate 63 moves, and the locking protrusion 50 locks in the locking hole 64 of the opening/cup plate 63, as shown in phantom lines in FIG. 1, so that the trigger 51 is locked in the retracted state.

Operation of the trigger 51 causes the operating body 35 to engage its locking protrusion (
Slider 3 rotates around part 37 (bottle-shaped protrusion)
9 rotates following this, and the tip portion 39a of this slider 39 touches the first slider sliding portion 44 of the movable piece 42.
The process then moves to the second slider sliding section 45. At this time, the spring member 34 is compressed, and when the tip portions 39a of the three sliders reach the second slider sliding portion 45 of the movable piece 42, they are expanded again. For this purpose, the movable piece 42
The movable contact 4 is biased clockwise using the fulcrum 4a.
3 contacts the second fixed contact 28.

In this way, when the movable contact 43 switches from the first fixed contact 27 to the second fixed contact 28, the motor M is energized and the motor M is driven.
An inrush current flows to the second fixed contact 28 side, causing welding of the contact.

However, the movable piece 42 is in a free state.

It is held by the spring member 34 and three sliders, and when the tip gIA portion 39a of the slider 39 moves through the first slider sliding portion 44 of the movable piece 42 to the second slider sliding portion 45, the spring member 34 is compressed, and when the tip 39a of the slider 39 reaches the second slider sliding portion 45 of the movable piece 42, it expands again.
2 is biased clockwise around the contact portion 34a, causing the movable contact 43 to roll a as shown by the arrow in FIG. 1 and come into contact with the second fixed contact 28. This improves the welding resistance and also improves the contact reliability of the contact portion.

Also, by pulling the trigger 51 again, the locking protrusion 50 is removed from the locking hole 64 of the opening plate 63, and by releasing the pulling force, the spring force of the return spring 73 returns the trigger 51 to its original position. Bring it back. For this reason, the lock operation button 60 is returned to its upward position by the spring force, and the end 63b of the lock plate 63 is locked to the locking part 48.
It moves from the second slider sliding part 45 to the first slider sliding part 44 via the back side of the contact part 42c. At this time, the spring member 34 is compressed, and when the tip portion 39a of the slider 39 reaches the first slider sliding portion 44 of the movable piece 42, it is expanded again. For this purpose, the movable piece 42
The movable contact 43 contacts the first fixed contact 27 by being biased counterclockwise about the fulcrum 4a.

As described above, the movable piece 42 is in a free state and is held by the spring member 34 and the slider 39, and the tip 39a of the slider 39 passes through the second slider sliding part 45 of the movable piece 42 When moving to the slider sliding portion 44 of No. 1, the spring member 34 is compressed, and the slider 3
9 reaches the first slider sliding portion 44 of the movable piece 42 and extends again, so the movable piece 42 is biased counterclockwise using the contact portion 34a as a fulcrum, and the movable contact 43 It contacts the first fixed contact 27 with a rolling b as shown by the arrow in FIG.

As a result, the welding resistance is improved, and the contact reliability of the contact portion is also improved. (Effects of the Invention) As explained above, the present invention provides the
A hook portion and a locking portion are provided, a guide hole is provided in the face portion of the trigger, a movable lock operation button is provided in the guide hole,
The base of the lock plate is attached to the back of this lock operation button, and the bent part of the middle part of this lock plate is brought into contact with the surface of the trigger. A lock plate-side locking portion is provided to be removably locked to the locking portion, and the lock operation button is moved backward by the biasing force of a spring to cause the end of the lock plate to collide with the locking portion of the case. Since the trigger is prevented from being pulled in, you can hook your index finger on the lock operation button, hook your middle finger on the trigger, move your index finger to move the lock operation button forward against the spring, and then open your mouth. The trigger plate can be moved forward to disengage the locking portion at the end of the plate to allow the trigger to be retracted, and in this state, by pulling the index and middle fingers, the trigger is actuated against the return spring. , This operation locks the locking protrusion into the locking hole of the lock plate, and when the trigger is pulled in, the mouth is opened! can be used. In other words, safety and ON locking becomes possible.

In addition, by pulling the trigger again, the locking protrusion is removed from the locking hole of the lock plate, and by releasing the pulling force, the trigger is returned to its original position by the spring force of the return spring, and the lock operation button is released from the spring. The end portion of the lock plate can be locked in the locking portion by being returned by force.

As described above, since the lock operation button is provided on the front surface of the trigger and is operated with the index finger, the safety and ON lock can be conveniently performed with either the right or left hand.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural explanatory diagram of a trigger switch structure according to the present invention, FIG. 2 is an explanatory diagram of a motor drive circuit incorporating the trigger switch structure according to the present invention, and FIG. 3 is a side view of an actuating body. 4 is a view as seen from the direction C in FIG. 7, FIG. 5 is a side view of the other side of the actuating body, FIG. 6 is a perspective view of the slider, FIG. 7 is a plan view of the trigger, and FIG. 8 is a side view of the other side of the operating body. Fig. 7 is a view taken from direction C, Fig. 9 is a view taken from direction C of Fig. 7, Fig. 10 is a bottom view of the trigger, Fig. 11 is a partially sectional side view of the trigger, Fig. 12 is a sectional view taken along the line E-E in Figure 7, Figure 13 is a plan view of the lock operation button, and Figure 13 is a plan view of the lock operation button.
Figure 4 is a view from the direction of arrow F in Figure 13, and Figure 15 is a view of the mouth and l.
FIG. 3 is a bottom view of the operation button. Fig. 16 is a sectional view of the same, Fig. 17 is a longitudinal sectional view of the conventional trigger switch structure, Fig. 18 is a sectional view taken along line G-C4 in Fig. 17, and Fig. 19 is taken along line H-H in Fig. 17. FIG. 21... Case, 46... Lock part, 50... Locking protrusion (locking part), 51... Trigger 53... Guide hole, 60... Lock operation button, 63... Lock plate, 64...Latching hole (lock plate side locking part). Figure 9 Figure 10 Figure 12 Figure n Figure 8''

Claims (1)

[Claims] In a trigger switch structure in which the trigger is moved against a return spring by pulling the trigger and the movable piece is actuated to switch the movable contact between the fixed contacts,
A lock part and a lock part are provided on the end face of the case, a guide hole is provided in the face of the trigger, a movable lock operation button is provided in the guide hole, and the base of the lock plate is provided on the back of the lock operation button. At the same time, the bent part of the middle part of the lock plate is brought into contact with the surface part of the trigger, and a lock plate side lock is provided on the end side of the lock plate that releasably locks into the locking part when the lock plate moves forward. A trigger characterized in that a stop portion is provided, the lock operation button is moved backward by the biasing force of a spring, and the end of the lock plate is brought into contact with the lock portion of the case to prevent the trigger from being pulled. switch structure.