JPH037868Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Target Technical Field" This invention relates to a relatively small seal switch, such as a vehicle, which requires high sealing performance.

"Prior art and its problems" Conventionally, this type of seal switch has a movable contact plate 12 and a fixed contact plate 13 disposed in a case 1, as shown in FIG. There is a device that is slidable in the axial direction, and the movable contact plate 12 is operated by a cam 27 attached to the plunger, and a cap-shaped seal 45 is provided between the plunger 23 and the housing 35. Since the switch operation is performed by the reciprocating movement of the plunger 23, the air pressure in the space inside the seal 45 and the case 1, that is, the air chambers 21 and 22 changes. As this operation is repeated, the air inside the air chambers 21 and 22 comes out, the air pressure decreases, and becomes negative pressure. Eventually, the plunger 23 becomes difficult to return to its original position with only the biasing force of the spring 33, and finally malfunctions. will be invited. This phenomenon becomes more severe as the atmospheric pressure change increases, and the greater the operating distance of the plunger 23, the greater the atmospheric pressure change. Further, it is desirable for this type of switch to have a plunger 23 with a large movement, but if the movement is large, it will lead to further malfunctions. Furthermore, there is a drawback that the seal 45 becomes fatigued due to pressure changes and becomes easily torn.

``Purpose'' This invention eliminates these conventional drawbacks, provides a sealed switch that is unlikely to cause changes in air pressure without degrading sealing performance, and also allows for easy formation of normally open or normally closed contacts. It is something to do.

``Example'' An example of this invention will be described below with reference to the drawings.

In other words, case 1 in Figures 1 to 7
has an opening 2 on one side. The case 1 has a wall portion 3 extending approximately diagonally within the case, and a first chamber 5 and a second chamber 5 in the axial direction of the case 1.
It is divided into two chambers, 6 and 6. Wall 3 has at least 3
A contact plate 1 formed of a plate-like material having elasticity in which grooves 7, 8, and 9 are provided through the grooves.
1, 12, and 13 are selectively fitted, one end thereof extending into the first chamber 5, and the other end thereof extending into the second chamber 6. And contact plates 11, 12,
A contact 15 is provided at one end of 13. In FIG. 1, reference numeral 12 indicates the active contact plate, and reference numeral 13
constitute a passive contact plate, and in FIG. 6, reference numeral 11 constitutes a passive contact plate. Further, the opening 2 of the case 1 is covered by a cover 16. Support parts 17 and 18 are protruded from one end of the cover and the case 1, and shaft holes 19 and 20 are provided in these support parts. Shafts 25 and 26 are protruded from both ends of the actuator 23 housed in the case 1, and the actuator 23 is inserted into the shaft holes 19 and 20 provided in the case 1 and the cover 16, respectively. is rotatably supported. A pair of cams 2 are provided on one side of the middle part of the actuator.
7 and 28 are provided protrudingly, and the tops of these cams are connected to a wide receiving portion 24 formed at one end of the active contact plate 12.
It is designed to collide with the In the first chamber 5, a regulating convex portion 30 is formed on the wall portion 3 so as to come into contact with an inclined surface 29 formed at a lower portion of the actuator 23 when the actuator 23 is in a predetermined rotating state, thereby regulating the rotation.
Below the actuator 23, a recess 31 is provided on the surface opposite to the cams 27, 28, and in the first chamber 5, the case 1 is provided with a protrusion 32, and between the protrusion and the recess 31, i.e. A coil spring 33 is provided between the case 1 and the actuator 23, which urges the other end of the actuator 23 toward the regulating convex portion 30 around the shafts 25 and 26. Housing 3
5 houses the assembled body with the case 1 and the cover 16 assembled, and a through hole 37 for protruding one end of the actuator 23 is provided in the end wall 36 at one end thereof. Engagement parts 39 and 40 are formed in the through hole to engage the support parts 17 and 18 of the case 1 and the cover 16, respectively. An end plate 41 is provided at the other end opening of the housing 35, and a protruding strip 4 having elasticity is provided at the peripheral edge of the end plate.
2, and this protrusion is formed to be slightly larger than the inner circumferential wall of the housing 35, that is, the size of the opening 38. A diaphragm seal 45 is placed on the end wall 36, and this diaphragm seal is positioned on the end wall 36 by edges 47, 48 projecting on both sides thereof. A hole 49 is provided in the center of the diaphragm seal 45,
The actuator 23 passes through this hole, and the diaphragm seal 4 is inserted into the groove 51 provided on the outer periphery of the actuator.
The hole edges of No. 5 are engaged. Step portions 55 and 56 are provided at one end and the other end of the housing 35 along first and second side walls 53 and 54 that face each other, and third and fourth step portions that intersect with the side walls 53 and 54 are provided. Engagement protrusions 59, 6 are provided on the side walls 57, 58.
0 is set. A pair of brackets 6 formed by bending a rectangular metal plate with bullets into a U-shape.
1, 62 has a diaphragm seal 4 in its center.
Window 63 having smaller dimensions than the external dimensions of 5
, and both sides thereof, that is, bent piece portions 65,
66 is an engagement hole 6 that engages with the engagement convex portions 59 and 60.
7, 67, and engagement bent portions 69, 70 that engage with the step portions 55, 56 are provided at edges intersecting the bent portions 65, 66. cable 7
1 is integrated with the end plate 41 while passing through it, and its core wire is selectively and electrically connected to the contact plates 11, 12, 13 in the second chamber 6 of the case 1. Ru. An engagement recess 73 is formed at one end of the actuator 23. An engagement end portion 76 that engages with the engagement recess 73 is formed at one end of the lever 75 formed of a plate-like member.

A contact portion 77 for receiving one end of the passive contact plate 13 is provided at one end of the case 1, and a stop portion 78 is formed in the case 1 on the opposite side from this contact portion.

"Assembly" Next, the seal switch in this embodiment is assembled as follows. First, the groove 7 of the wall part 3,
The contact plates 11, 12, 13 are selectively fitted to the contacts 8, 9. That is, when configuring a normally closed switch, the passive contact plate 11 is fitted into the first groove 7 and the active contact plate 12 is fitted into the second groove 8, and when configuring a normally open switch, the passive contact plate 11 is fitted into the first groove 7 and the active contact plate 12 is fitted into the second groove 8. is passive contact plate 1
3 into the third groove 9. Next, the cable 71,
One end of the contact plate 71 is inserted into the hole 14 of each contact plate and soldered. In this state, the end plate 41 comes into contact with the other end of the case 1. Next, one shaft 25 of the actuator 23 is inserted into the support part 17, that is, the shaft hole 19. At this time, one end of the coil spring 33 is inserted into the recess 31 of the actuator 23, and the other end is inserted into the convex part of the case 1. 32 respectively. Thereafter, the cover 16 is assembled to the case 1 so as to cover the opening thereof. At this time, the other shaft 26 of the actuator 23 is inserted into the support portion 18 of the cover 16, that is, the shaft hole 20. The internal assembly thus assembled is inserted into the housing 35 from the other end opening 38. The supporting parts 17 and 18 are connected to the engaging part 39,
40, thereby reinforcing the supports 17, 18. Further, at this time, the elasticity of the protruding strip 42 forms a case between the housing 35 and the end plate 41. Next, attach the other bracket 62 to the housing 3.
5 from the other end, and the engagement protrusions 60, 60 of the housing 35 are engaged with the engagement holes 67, 67 by their elasticity. Further, one end of the actuator 23 is inserted into the hole 49 of the diaphragm seal 45, and the edge of this hole is fitted into the groove 51, thereby ensuring sealing between the two. Next, with the diaphragm seal 45 stacked on the end wall 36, one bracket 61 is fitted into the housing 35 from one end,
The engagement projections 59, 59 are engaged with the engagement holes 67, 67 of the bracket 61 by their elasticity. In this state, the peripheral edge of the diaphragm seal 45 is compressed by the housing 35 and one of the brackets 61, thereby ensuring sealing between them. Further, in this state, the housing 35 and the internal assembly are integrated. Next, the engaging end 7 of the lever 75
6 is fitted into the engagement recess 73 of the actuator 23, assembly of the switch is completed.

"Operation" Next, the operation of this switch will be explained with reference to FIGS. 1 and 5.

That is, FIG. 1 shows a free state of a normally open circuit, and the actuator 23 receives a force in a clockwise direction about the shafts 25 and 26 due to the biasing force of the coil spring 33, thereby causing the other end inclined surface to 29 abuts against the convex portion 30. Furthermore, since the return force of the active contact plate 12 is smaller than the biasing force of the coil spring 33, the passive contact plate 13 is
As a result, both contacts 15, 15 are separated from each other and maintain a normally open state. At this time, one end of the passive contact plate 13 contacts the contact portion 77 of the case 1 due to its elasticity,
This prevents movement toward the active contact plate 12 side.

Next, when an external force is applied to the lever 75, the actuator 23 rotates counterclockwise about the shafts 25 and 26 against the coil spring 33, and the cams 27 and 28 also move away from the active contact plate 12. Therefore, this contact plate moves toward the passive contact plate 13 due to its return force, and both contacts 15, 15 come into contact with each other, closing the circuit. Further, when an external force is applied to the lever 75, the cams 27 and 28 are completely separated from the active contact plate 12 as shown in FIG. 5, and the passive contact plate 13 is separated from the contact portion 77 due to the elasticity of the active contact plate. At this time, the actuator 23 comes into contact with the stopper 78 of the case 1, and its rotation is restricted.

Furthermore, when the external force on the lever 75 is removed in this state, the actuator 23 returns to its original position, and at the same time both contact plates 1
2 and 13 are also in the state shown in FIG.

During this operation, the diaphragm seal 45 deforms around its hole 49, but the volume of the air within the housing 35 hardly changes.

Further, since the only portions of the housing 35 that communicate with the outside are the hole 37 and the opening 38, it goes without saying that a complete seal can be achieved by closing these portions.

"Effect" According to this invention, since the external force applied to the lever 75 is converted into a seesaw movement of the actuator 23,
The change in air pressure inside the housing 35 can be extremely reduced, and therefore the actuator 2 due to negative pressure phenomenon can be
In addition to being able to solve the problem of return failure in 3.
The thickness of the diaphragm seal 45, especially the actuator 2
Since there is no need to make the tightening force of the penetration part 3 particularly strong, there is no fear that the diaphragm seal 45 will tear during switch operation, and no extra force is required during assembly, making the work easier. It has good properties and can therefore be supplied at low cost. In addition, since the wall is provided with at least three grooves passing through the wall, by changing the fitting positions of the active contact plate and the passive contact plate relative to the wall, normally open or normally closed contacts can be set. can be easily formed.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the seal switch in this invention, Fig. 2 is an external perspective view, Fig. 3 is an exploded perspective view, Fig. 4 is a perspective view of the internal assembly, Figs. 5, 6, and FIG. 7 is a front sectional view for explaining the operation, and FIG. 8 is a front sectional view of a conventional seal switch. 1... Case, 2... Opening, 3... Wall, 5
...First room, 6...Second room, 7, 8, 9...
Groove, 11, 12, 13... contact plate, 14... hole,
15... Contact, 16... Cover, 17, 18...
Support part, 19, 20... shaft hole, 23... actuator,
24... Receiving part, 25, 26... Shaft, 27, 28
...cam, 29...slanted surface, 30...regulating convex portion,
31... recess, 32... protrusion, 33... coil spring, 35... housing, 36... end wall,
37... Hole, 38... Opening, 39, 40... Engaging portion, 41... End plate, 42... Convex strip, 45... Diaphragm seal, 47, 48... Edge, 49...
... hole, 51 ... groove, 53 ... first side wall, 54
...Second side wall, 55, 56...Step part, 57...
Third side wall, 58... Fourth side wall, 59, 60...
...Engagement convex portion, 61, 62...Bracket, 63...
...window, 65, 66...bending piece, 67...engaging hole, 69, 70...bending part, 71...cable, 73...recess, 75...lever, 76...engaging End portion, 77...Abutting portion, 78...Stopping portion.

Claims (1)

[Scope of utility model registration request] A wall portion that divides the case into two into a first chamber and a second chamber in the axial direction is provided in a case having an opening on one surface, and this wall portion has at least three holes penetrating through the wall portion. A groove is provided, and the intermediate portions of the active contact plate and the passive contact plate are fitted into the groove, and the contact is placed in the portion of these contact plates located in the first chamber, and the contact is placed in the portion of the contact plate located in the second chamber. An actuator for operating the contact plate is rotatably supported between the case and a cover that covers the opening of the case, and one end of the actuator is connected to the part of the case. By protruding through a seal provided at one end and providing a cam for operating the active contact plate at the other end, the fitting positions of the active contact plate and the passive contact plate relative to the groove are changed. A sealed switch that forms a normally open or normally closed contact.