JPH0528658Y2 - - Google Patents

Description

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

[Prior art] As a conventional example of this type of switch,
Some are described in Publication No. 18585. In this practical application, a contact chamber for opening and closing a contact portion is sealed around it by a housing and a terminal.

[Problem to be solved by the invention] In the case of the above-mentioned conventional example, since the contact chamber that opens and closes the contact part is sealed around the housing and the terminal, debris from the opening and closing of the contact part accumulates inside, impairing the insulation performance. There was a problem that it caused deterioration.

The present invention has been proposed in view of the above-mentioned points, and provides a switch whose purpose is to prevent insulation deterioration by allowing debris caused by opening and closing of the contact portion to escape from the ventilation hole.

[Means for Solving the Problems] The present invention forms a recess that communicates with a contact chamber in which a contact portion is arranged, and forms a ventilation hole that communicates with the recess and exhausts debris from opening and closing of the contact portion. A protruding base portion is formed on the outside of the housing corresponding to the recess from which the terminal is protruded.

[Function] The projecting part serves as a spacer when the terminal is mounted on a printed circuit board by letting the objects scattered by the opening and closing of the contact part escape through the recess and ventilation hole. be.

(Example 1) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 6 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. Further, support pieces 21 are formed approximately in the middle of the actuator 19, and these support pieces 21 are located in the recesses 17 of the terminal plate 13, and as shown in FIG.
A fulcrum part 22 is formed, and the actuator 19 can rotate freely around the fulcrum part 22 to support the terminal plate 13.
It is becoming increasingly popular. A small-diameter fixed part 26a of a movable contact 26 facing the fixed contact 12 is inserted into a hole 25 at the bottom of a conductive movable contact piece 24 having an opening 23 in the center, and the movable contact 26 is movable. It is fixed to the 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 2 of the movable contact piece 24.
3 and inserting the upper piece 24a of the movable contact piece 24 into the groove 28 to form the second fulcrum part 29 as shown in FIG. and can be rotated freely.

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. 3b. 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 communicating with the opening 23 of the movable contact piece 24, and the fourth fulcrum 34 is moved as shown in FIG. 3b. is forming. 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 part 35a of the coiled spring 35 is inserted into the support piece 21 of the actuator 19, one end 35b of the spring 35 is locked to the lower surface of the pressing part 20 of the actuator 19, and the other end 35c is connected to the terminal plate 13.
The spring 35 urges the actuator 19 counterclockwise using the first support portion 22 as a fulcrum, as shown in FIG. 3b.

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. 3b, 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, 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. 3b, 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.
Note that the base 1 and the case 36 constitute a housing.

Next, the operation will be explained. Figure 3 shows the release state, Figure 4 shows the full stroke state, and Figure 5 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. 3 shows the off state, which is the release state, and the actuator 19 is biased 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. Further, as shown in FIG. 6, the lower end surface 27 of the U-shaped portion 27 of the actuator 19
a is in contact with the surface 30c of the reversing spring 30 on the one end 30a side. Here, when the sliding body 37 is pressed downward, the pressing part 20 is pressed by the protrusion 45, and the actuator 1 is moved around the first fulcrum part 22.
9 rotates clockwise. At this time, the movable contact piece 24
The second fulcrum portion 29 of the actuator 19 supporting the actuator 19 also rotates clockwise, and the reversing spring 30
The third fulcrum portion 32 of the actuator 19, which rotatably supports one end 30a of the actuator 19, also rotates clockwise. In other words, the second fulcrum part 29 is the fixed contact 12
The third fulcrum portion 32 moves to the side opposite to the fixed contact 12. And each fulcrum part 29,3
2 is aligned with the fourth fulcrum part 34, the reversing spring 30 reverses, the movable contact piece 24 separates from the stopper part 47 inside the terminal plate 13, and both contacts 12 and 26 come into contact instantly. do. When the actuator 19 is fully rotated clockwise, both arm pieces 19a of the actuator 19 are rotated as shown in FIG.
and the end surfaces 24 of both sides of the movable contact piece 24.
b comes into contact with.

Then, as shown in FIG. 4, 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. 5, 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. In this way, the movable contact piece 24 and the reversing spring 3
Since the second fulcrum part 29 and the third fulcrum part 32 to the actuator 19 of 0 move together, the actuator 1 changes from the OFF state of the contacts 12 and 26 to the ON state.
9 position and actuator 19 from on to off.
The difference in position between the two is smaller than when one side is fixed. 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. 7 shows a side view of the sliding body 37, and FIG. 8 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. 9a, 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 fourth
Fig. 9b shows the full stroke state shown in Fig. 9b. 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 locked state shown in FIGS. 5 and 9c.

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.

Next, the gist of the present invention will be explained. As shown in FIG. 1, 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. The lower part of this contact chamber 49, that is, the base 1
A recess 50 is formed in the bottom of the contact chamber 49 to scatter debris when the contact is opened and closed, and a ventilation hole 51 having an inclined surface communicating with the recess 50 to the outside of the contact chamber 49 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. When a push button switch is mounted on a printed board 53 as shown in FIG. 2, this protrusion 52 serves as a spacer to create a space between the printed board 53 and the base 1, making it difficult for heat to be transmitted during soldering. ing. 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. 3b, the operating direction of the push button 38 and the movable contact piece 24 are
The actuator 19 converts the operating direction of the push button 38 into a perpendicular direction (lateral 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 has a contact section that is opened and closed by operating the operation section, and at least one surface of the housing that houses this contact section and faces the mounting surface of the printed board when mounted on the printed board. In the switch, the one side of the contact chamber is bulged toward the mounting surface of the printed board to form a protrusion that provides an appropriate distance between the mounting surface of the printed board and the lower surface of the housing. At the same time, a recess formed on the contact chamber side by bulging this protruding part,
This is a recess that collects flying debris caused by the opening and closing of the contacts, and a ventilation hole is provided that communicates the recess with the outside of the contact chamber. , insulation deterioration can be prevented. In addition, the protrusion allows for a gap between the switch body, such as the contacts, and the printed board, reducing the amount of heat applied to the switch body when soldering the switch to the printed board using automatic soldering. This has the effect that problems such as thermal deformation of the housing made of synthetic resin are less likely to occur.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view of the same as above, Figs.
b is a broken perspective view and sectional view of the main part in the same as above in the full stroke state, FIGS. 5 a and b are a broken perspective view and sectional view of the main part in the lock stroke state as above, and FIG. , FIG. 7 is a front view of the same sliding body, FIG. 8 is an enlarged view of a main part of the same sliding body, and FIGS. 9 a to 9 c are explanatory views of the operation of the stopper side of the same. 12 is a fixed contact, 26 is a movable contact, 49 is a contact chamber, 50 is a recess, 51 is a ventilation hole, 52 is a protrusion,
53 is a printed board.

Claims (1)

[Scope of utility model registration request] A switch comprising a contact section that is opened and closed by operation of an operating section, and a contact chamber in which the contact section is housed and at least one side of which is formed by a housing surface that faces the mounting surface of the printed board when mounted on a printed board. By protruding the above-mentioned one surface toward the mounting surface side of the printed board to form a protruding part that provides an appropriate distance between the mounting surface of the printed board and the lower surface of the housing, and by forming this protruding part to protrude. 1. A switch characterized in that a recess formed on the side of a contact chamber is used to collect flying debris generated by opening and closing of a contact, and a ventilation hole is provided to communicate the recess with the outside of the contact chamber.