JPH0535542Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a quick-acting reversible push button switch using a leaf spring.

[Prior Art] As a conventional example of a quick-acting reversible push button switch using this type of leaf spring, Japanese Utility Model Publication No. 53-28047,
Some of these are described in Utility Model Publication No. 53-34516, Utility Model Publication No. 61-18585, Utility Model Publication No. 62-31947, Utility Model Publication No. 62-30252, and Utility Model Publication No. 62-30253. In such conventional examples, one end of a contact piece having a movable contact or a reversing spring for reversing the contact piece is fixed.

[Problems to be Solved by the Invention] In the case of the above-mentioned conventional example, if the end of the contact piece is fixed, there is a problem that there is no wiping action of the contact, and the contact is likely to be welded. Furthermore, since the contact piece and the reversing spring are assembled into separate members (because four or more parts are assembled at once), workability is poor, and large-scale assembly equipment such as an automatic machine is required. Furthermore, since one or both sides of the support portion of the contact piece is fixed, there are problems in that hysteresis is large and the operation stroke is large.

The present invention was developed in view of the above-mentioned points, and has the advantage of increasing the wiping action of the contacts, improving assembly workability, and further increasing the contact pressure with a small stroke of the operating section, thereby turning on and off. The object of this invention is to provide a push button switch with low hysteresis.

[Means for Solving the Problems] The present invention includes an actuator that has a pressing portion at one end that receives the operating force of a push button, and the other end of which is rotatably supported on the upper surface of the other end of the actuator. A movable contact piece having a movable contact at the bottom, one end rotatably supported on the lower surface of the other end side of the actuator, and the other end rotatably supported on the other end side of the movable contact piece, so that the movable contact piece has a movable contact point on the other end side of the actuator. A movable block consisting of a reversing spring that drives a movable contact piece through a reversing action, a terminal plate that rotatably supports a first fulcrum portion formed approximately in the middle of the actuator, and an operating force of a push button. and a spring that applies a return force to the actuator in the opposite direction to that of the actuator. The rotation support part is a third fulcrum part, the second fulcrum part and the third fulcrum part are formed at positions shifted from an extension line of the pressing part and the first fulcrum part, and The second fulcrum part and the third fulcrum part are provided on opposite sides of the extension line, and the actuator and the movable contact piece move toward each other around the second fulcrum part in response to the operating force from the push button. When rotating, mutual rotation of the actuator and the movable contact piece is restricted at a position where the surface of the actuator opposite to the pressing part and a key point of the movable contact piece come into contact;
When the operating force from the push button is released and the actuator and movable contact piece rotate away from each other around the second fulcrum, the other end surface of the actuator and the one end surface of the reversing spring. Mutual rotation of the actuator and reversal spring around the third fulcrum is restricted at the position where they make contact, and the contact closes at an intermediate position within the range in which the actuator rotates due to the operating force of the push button. be.

[Operation] Push the pressing part of the actuator with the push button to rotate the actuator around the first fulcrum part, and this rotation supports the rotation of the actuator and the movable contact piece and the actuator and the reversing spring. By moving the second and third fulcrum parts, which are the
When the third fulcrum and the other end of the reversing spring are aligned with the rotating support at the other end of the movable contact, the reversing spring is reversed to instantaneously close the contact, and the push button When the push button is pressed, the second fulcrum section rotates to perform a wiping operation on the contacts, and when the push button is released, the return force of the spring causes the actuator to return to the first position. The second and third fulcrum parts and the other end of the reversing spring are aligned in a straight line with the rotation support part of the other end of the movable contact piece. At this point, the reversing spring is reversed to instantaneously open the contact, and both the second fulcrum part and the third fulcrum part are moved when the contact opens and closes.

(Example 1) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 4 shows an exploded perspective view of the entire push-button switch, and the push-button switch is composed of a switch section A, such as a reversing mechanism section, and a push-button section B, which drives the switch section A.

First, switch section A will be explained. The base 1 is made of an insulating material, and a support wall 2 is integrally erected on one side. A locking projection 3 is formed on the outer surface of the support wall 2, and an insertion recess 4 is formed below the locking projection 3. An insulating wall 5 is vertically provided on the lower surface of the base 1, and grooves 6 are formed inside both sides of the supporting wall 2. Furthermore, a through hole 7 is formed on the side of the base of the support wall 2, passing through the upper and lower surfaces of the base 1.
A slit 8 is formed in the upper surface of the base 1 so as to communicate with the through hole 7. The conductive terminal plate 9 is approximately L
It is bent into a shape, with one end serving as a contact plate 10 and the other end serving as a terminal piece 11. A hole 10a is bored in the contact plate 10, and a small-diameter fixing portion 12a of the fixed contact 12 is inserted into the hole 10a, thereby fixing the fixed contact 12 to the contact plate 10. The terminal piece 11 is suspended below the base 1 through the through hole 7 of the base 1, the contact plate 10 is held in the slit 8 of the base 1, the terminal plate 9 is fixed to the base 1, and is positioned, A fixed contact 12 is fixed at a predetermined position on the base 1.

A terminal piece 14 is formed at the lower part of the conductive terminal plate 13, and like the terminal piece 11 described above, this terminal piece 14 passes through the base 1 and hangs down, and both terminal pieces 11, 14 are formed on both sides of the insulating wall 5. I am trying to place it. A locking piece 15 is formed at the corner of the terminal plate 13, and the locking piece 15 is inserted into the groove 6 of the base 1 from above to position and fix the terminal plate 13 to the base 1. There is. Projecting pieces 16 are provided on both sides of the upper part of the terminal plate 13 on the locking piece 15 side toward the outside.
are protruding from each other, and a recess 17 is formed approximately in the middle. Further, a stepped portion 18 is formed at the lower part of the upper tip of the terminal plate 13, respectively.

The conductive actuator 19 is formed in a substantially U-shape, and tongue-shaped pressing portions 20 protruding outward are formed at both ends. Furthermore, support pieces 21 are formed at substantially intermediate portions of the actuator 19, and these support pieces 21 are positioned within the recesses 17 of the terminal plate 13 to form a first fulcrum portion as shown in FIG. 1b. 22, and the actuator 19 is rotatably supported by the terminal plate 13 using this fulcrum portion 22 as a fulcrum. Opening 2 in the center
The small-diameter fixing part 26a of the movable contact 26 facing the fixed contact 12 is inserted into the hole 25 at the bottom of the movable contact piece 24, which has a conductive shape and has a conductive shape.
6 is fixed to the movable contact piece 24. A groove 28 is formed on the upper surface of the U-shaped portion 27 of the actuator 19, and the U-shaped portion 27 is connected to the opening 23 of the movable contact piece 24.
The upper piece 24a of the movable contact piece 24 is inserted into the groove 28 to form the second fulcrum part 29 as shown in FIG. It is rotatable.

One convex end 30a of the reversing spring 30, which is bent into a substantially Ω shape, is rotatably engaged with the recessed step 31 on the lower surface of the U-shaped portion 27 of the actuator 19, as shown in FIG. 1b. A third fulcrum portion 32 is formed. Further, the other end 30b of the reversing spring 30 is rotatably inserted and locked into the notch 33 that communicates with the opening 23 of the movable contact piece 24, so that the fourth fulcrum 3 is fixed as shown in FIG. 1b.
4 is formed. In this way, the actuator 19 supports the movable contact piece 24, and the end of the reversing spring 30 is engaged with the actuator 19 and the movable contact piece 24, thereby forming one movable block. The central cylindrical portion 35 a of the coiled spring 35 is inserted into the support piece 21 of the actuator 19 , one end 35 b of the spring 35 is locked to the lower surface of the pressing portion 20 of the actuator 19 , and the other end 35 c is secured to the lower surface of the pressing portion 20 of the actuator 19 . The spring 35 is engaged with the lower surface of the projecting piece 16, and the actuator 19 is biased counterclockwise using the first fulcrum portion 22 as a fulcrum, as shown in FIG. 1b.

Next, the push button section B will be explained. A rectangular cylindrical case 36 made of an insulating material, a prismatic cylindrical sliding body 37 made of an insulating material arranged vertically movably in the lower part of the case 36, and a rectangular cylindrical sliding body 37 arranged vertically movably in the upper part of the case 36. It consists of a push button 38, a U-shaped stopper 39, a presser spring 40, and the like. Elastic pieces 41 having elasticity for attachment to a panel etc. are integrally formed on both sides of the case 36, and an insertion piece 42 is inserted into the insertion recess 4 of the base 1 and a locking protrusion 3 of the base 1. A locking recess 43 that locks and connects the case 36 and the base 1
is formed on the case 36. A guide rib 44 is formed in the vertical direction on the outer surface of the sliding body 37, and this rib 44 is fitted into a guide groove (not shown) formed on the inner surface of the case 36, and the sliding body 37 is movable in the vertical direction within the case 36. As shown in FIG. 1b, a protrusion 45 is formed on the inner surface of the sliding body 37 to press the pressing portion 20 of the actuator 19. Holding spring 40
is for holding the stopper 39 in the case 36, and one end of the stopper 39 is held in the case 36.
6 is rotatably held, the other end is a free end, and the other end is engaged with a heart cam 46 as described later, and the sliding body 37 is stopped at a predetermined position to open and close the contacts 12 and 26. I try to do this. In addition, the second fulcrum part 29 and the third fulcrum part 32
As shown in FIG. 1b, the actuator 19
It is located at a position offset from the extension line of the pressing part 20 and the first fulcrum part 22, and both fulcrum parts 29, 32
are located on the opposite side from the extension line.

Next, the operation will be explained. Figure 1 shows the release state, Figure 2 shows the full stroke state, and Figure 3 shows the full stroke state.
The figures show the respective lock stroke states. The sliding body 37 that drives the switch part A is a push button 38
It is moved up and down and locked again by the operation of , but this point will be described later.First, the operation of the switch section A will be explained.

FIG. 1 shows the off state, which is the release state, and the actuator 19 is urged counterclockwise around the first fulcrum part 22 by the restoring force of the spring 35, so that the pressing part 20 of the actuator 19
The protrusion 45 is urged upward, and the sliding body 37 is located upward. Furthermore, as shown in FIG.
It is in contact with c. Here, when the sliding body 37 is pressed downward, the pressing portion 20 is pressed by the projection 45, and the actuator 19 rotates clockwise about the first fulcrum portion 22. At this time, the second fulcrum part 29 of the actuator 19 that supports the movable contact piece 24 also rotates clockwise, and the second fulcrum part 29 of the actuator 19 that rotatably supports one end 30a of the reversing spring 30. The fulcrum portion 32 of No. 3 also rotates clockwise. In other words, the second fulcrum part 29 moves toward the fixed contact 12, and the third fulcrum part 32 moves toward the fixed contact 1.
Move to the opposite side of 2. And each fulcrum part 2
9 and 32 are aligned with the fourth fulcrum portion 34, the reversing spring 30 reverses and moves the movable contact piece 24.
is separated from the stopper portion 47 inside the terminal plate 13, and both contacts 12 and 26 instantly come into contact with each other. When the actuator 19 begins to rotate clockwise, the end surfaces 19b of both arm pieces 19a of the actuator 19 come into contact with the end surfaces 24b of both side pieces of the movable contact piece 24, as shown in FIG. 2b. That is, pushbutton 3
When the actuator 19 and the movable contact piece 26 rotate in a direction toward each other around the second fulcrum part 29 in response to the operating force of This is regulated by contact with the end surface 24b.

Then, as shown in FIG. 2, the sliding body 3
7, the second fulcrum portion 29 moves upward, and the movable contact piece 24, that is, the movable contact 26 also moves upward, so that the contact points 12,
Force is applied in the plane direction of 26, resulting in a wiping effect. Here, as will be described later, even if the push button 38 is stopped, the sliding body 37 is locked.
The sliding body 37 stops as shown in FIG. 3, and the actuator 19 is maintained in a slightly restored state, so that the contacts 12 and 26 remain closed.

Next, when the load applied to the sliding body 37 is reduced, that is, when the push button 38 is pressed again to unlock the sliding body 37, the actuator 19 rotates counterclockwise due to the return force of the spring 35. ,
When each fulcrum part 29, 32, 34 is lined up in a straight line, the reversing spring 30 is reversed and the movable contact piece 24 moves to the opposite side from the fixed contact 26, and both contacts 12, 26
will be separated. Then, the movable contact piece 24 hits the stopper portion 47 and returns. At this time, the lower end surface 27a of the U-shaped portion 27 of the actuator 19
comes into contact with the surface 30c of the reversing spring 30 on the one end 30a side. That is, when the operating force of the push button 38 is released and the actuator 19 and the movable contact piece 26 rotate away from each other around the second fulcrum 29, the actuator 19 and the reversing spring 30
The mutual rotation around the third fulcrum part 32 with
As shown in FIG. 1b, the lower end surface 27a and the surface 30c
It is regulated by contact with In this way, the movable contact piece 24 and the reversing spring 30 are connected to the actuator 19 at the second fulcrum part 29 and the third fulcrum part 32.
Since both of the contacts 12 and 26 move together, the difference between the position of the actuator 19 from off to on and the position of the actuator 19 from on to off of the contacts 12 and 26 is smaller than when one of the contacts is fixed.
In other words, the on/off hysteresis is reduced. Further, since the actuator 19, movable contact piece 24, and reversing spring 30 are assembled as one block, workability is improved. Further, a large contact pressure can be obtained with a small stroke of the operating section.

Next, the locking mechanism of the sliding body 37 will be explained. FIG. 5 shows a side view of the sliding body 37, and FIG. 6 shows an enlarged view of the heart cam 46.
A groove 48 is formed around the heart cam 46, and a lower end 39b of the stopper 39 is movably positioned in this groove 48. Also, stopper 39
The upper end 39a of the case 36 is rotatably supported at a key point of the case 36. Now, in the released (off) state shown in FIG. 7a, the stopper 39 is at the position indicated by the dashed line as shown in FIG. 3
9 slides on the a side of the heart cam 46 and comes into contact with the recess 48a of the groove 48 to restrict movement. This time is the second
Fig. 7b shows the full stroke state shown in Fig. 7b. When the push button 38 is stopped, the return force of the spring 35 causes the actuator 1 to
9 rotates to apply a restoring force to the sliding body 37.
At this time, the stopper 39 slides from the position of the recess 48a on the b surface of the recess 46a of the heart cam 46 and is positioned within the recess 46a, so that its movement is restricted. This is the clock state shown in FIGS. 3 and 7c.

Next, when the push button 38 is pressed to turn off the contacts 12 and 26, the sliding body 37 moves downward. That is, when the stopper 39 slides on the c side of the groove 48, moves to the recess 48b of the groove 48, and stops pressing the push button 38 when the movement is restricted, the stopper 39 moves on the d part of the groove 48,
Return to original position.

As shown in FIG. 8, both contacts 12 and 26 are arranged in a contact chamber 49 in a space surrounded by the terminal plate 13 and the bottom of the base 1. As shown in FIG. Below the contact chamber 49, that is, at the bottom of the base 1, there is a recess 50 for scattering debris when the contact is opened and closed, and a ventilation hole having an inclined surface communicating with the recess 50 to the outside of the contact chamber 49. 51 is formed. Therefore, it is possible to easily escape the flying debris caused by the opening and closing of the contacts through the ventilation hole 51, and prevent the flying debris from accumulating inside, thereby preventing insulation deterioration. Furthermore, a protrusion 52 is formed on the lower surface of the base 1 corresponding to the recess 50 to form the recess 50. The protruding portion 52 allows the printed board 53 to be
When the push button switch is mounted on the printed board 53
It serves as a spacer to create a gap between the base 1 and the base 1, making it difficult for heat to be transmitted during soldering. Therefore, since heat is not easily transferred to the base 1 holding the terminal plates 9 and 13, the problem of the terminal plates 9 and 13 coming loose from the base 1 does not occur.

Here, in this embodiment, as shown in FIG. 1b, the operation direction of the push button 38 and the movable contact piece 24 are
The actuator 19 converts the operating direction of the pushbutton 38 into a perpendicular direction (horizontal direction in the figure) and drives the movable contact piece 24 in a direction perpendicular to the operating direction. As shown in , the lateral length S, that is, the projected area can be reduced. In other words, the dimensions that affect the projected area of the external shape are determined by the width dimension of the movable contact piece 24 and the moving distance of the contact part on the movable contact 26 side, and the longitudinal dimension of the movable contact piece 24 has no effect, so the projected area can be reduced. It is something that can be done.

[Effects of the invention] As described above, the present invention includes an actuator that is provided with a pressing part that receives the operating force of a push button at one end, and one end that is rotatably supported on the upper surface of the other end of the actuator and the other end that is rotatably supported. A movable contact piece having a movable contact point, one end rotatably supported on the lower surface of the other end side of the actuator, and the other end rotatably supported on the other end side of the movable contact piece, and the reversal by the rotational movement of the actuator. A movable block constituted by a reversing spring that drives a movable contact piece by operation, a terminal plate that rotatably supports a first fulcrum portion formed approximately in the middle of the actuator, and an operating force of a push button. is provided with a spring that applies a return force to the actuator in the opposite direction, and uses the top surface of the actuator and the rotation support part at one end of the movable contact piece as a second fulcrum part, and the rotation support part of the top surface of the actuator and one end of the movable contact piece, and the rotation support part of the bottom surface of the actuator and one end of the reversing spring. The dynamic support part is a third fulcrum part, the second fulcrum part and the third fulcrum part are formed at positions shifted from an extension line of the pressing part and the first fulcrum part, and The second fulcrum part and the third fulcrum part are provided on opposite sides of the extension line,
When the actuator and the movable contact piece rotate toward each other around the second fulcrum in response to the operating force from the push button, the surface of the actuator opposite to the pressing part and the key point of the movable contact piece rotate. Mutual rotation of the actuator and movable contact piece is restricted at the position where they make contact, and the operating force from the push button is released, causing the actuator and movable contact piece to rotate away from each other around the second fulcrum part. When the actuator is pressed against the pushbutton, mutual rotation of the actuator and the reversing spring around the third fulcrum is restricted at a position where the other end surface of the actuator and the one end surface of the reversing spring contact each other. Since the contact closes at an intermediate position in the range of rotation due to the operating force of This rotation moves the actuator, the movable contact piece, the actuator and the reversing spring, and the second and third fulcrum parts, which are rotation support parts, and the second and third fulcrum parts and the other end of the reversing spring. When the rotation support part at the other end of the movable contact piece is aligned, the reversal spring is reversed to instantaneously open the contact, and the second fulcrum part is rotated by pressing the push button. By wiping the contacts during operation, a large wiping operation can be achieved.Also, by releasing the pushbutton, the actuator is centered around the first fulcrum by the return force of the spring. When the second and third fulcrum parts and the other end of the reversing spring are aligned with the rotation support part of the other end of the movable contact piece, the reversing spring is rotated in the opposite direction to the above. By reversing the contact point to instantaneously open the contact and moving both the second and third fulcrum parts when opening and closing the contact, a large contact pressure can be obtained with a small operation stroke. Moreover, the hysteresis of the contact on and off can be reduced.

Further, an actuator is provided with a pressing part that receives the operating force of a push button at one end, a movable contact piece whose one end is rotatably supported on the upper surface of the other end of the actuator and has a movable contact at the other end, a reversing spring that is rotatably supported on the lower surface of the other end of the actuator, the other end of which is rotatably supported on the other end of the rotary contact piece, and drives the movable contact piece through a reversal action caused by the rotary movement of the actuator; The actuator and the movable contact piece form a movable block, and when the actuator and the movable contact piece rotate with each other, the surface on the opposite side of the pressing part of the actuator and the important part of the movable contact piece are brought into contact with each other, and the actuator and the reversing spring are mutually rotated. By rotating the actuator, the surface on the other end side of the actuator and the surface on the one end side of the reversing spring are brought into contact with each other, thereby making it easier to assemble the actuator, movable contact piece, and reversing spring as one movable block. This has the effect of improving

[Brief explanation of the drawing]

FIGS. 1a and 1b are a perspective view and a sectional view of the main parts of the embodiment of the present invention in the released state, and FIGS. 2a and 2b are
b is a broken perspective view and sectional view of the main parts in the same as above in the full stroke state, FIGS. 3 a and b are a broken perspective view and sectional view of the main parts in the same as in the lock stroke state, and FIG. , FIG. 5 is a front view of the same sliding body, FIG. 6 is an enlarged view of the main part of the same sliding body, FIGS. 7 a to c are explanatory diagrams of the operation of the same stopper side, and FIG. FIG. 9 is a sectional view of the same as above. 12 is a fixed contact, 19 is an actuator, 22
2 is a first fulcrum part, 24 is a movable contact piece, 26 is a movable contact, 29 is a second fulcrum part, 30 is a reversing spring, 32
is the third fulcrum, 35 is the spring, 38 is the push button,
It is.

Claims (1)

[Scope of utility model registration request] A pushbutton switch that opens and closes contacts by the reversal action of a plate-shaped reversal spring when a pushbutton is pressed includes an actuator that has a pressing part on one end that receives the operating force of the pushbutton, and one end on the top surface of the other end of the actuator. A movable contact piece that is rotatably supported on one side and has a movable contact on the other end, and one end is rotatably supported on the lower surface of the other end side of the actuator and the other end is rotatably supported on the other end side of the movable contact piece. a movable block consisting of a reversing spring that supports the movable contact piece and drives the movable contact piece by a reversing action caused by the rotational action of the actuator; and a first movable block formed approximately in the middle of the actuator.
a terminal plate that rotatably supports the fulcrum of the actuator, and a spring that applies a return force to the actuator in the opposite direction to the operating force of the push button. is the second fulcrum part, and one end of the reversing spring and the rotary support part on the lower surface of the actuator are the third fulcrum part, and the second fulcrum part and the third fulcrum part are connected to the pressing part and the third fulcrum part. 1
The second fulcrum part and the third fulcrum part are provided on opposite sides of the extension line, and the actuator is actuated by receiving the operating force from the push button. When the actuator and the movable contact piece rotate toward each other around the second fulcrum part, the actuator and the movable contact piece rotate at a position where the surface of the actuator opposite to the pressing part and the key point of the movable contact piece come into contact with each other. When the operating force from the push button is released and the actuator and movable contact piece rotate away from each other around the second fulcrum, the surface on the other end side of the actuator The mutual rotation of the actuator and the reversing spring around the third fulcrum is restricted at the position where the surface of one end of the reversing spring comes into contact, and the actuator is an intermediate position in the range in which it rotates due to the operating force of the push button. A push-button switch characterized by a contact point that closes when the button is pressed.