JPH0935567A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent coming off of a part held to an inner case, relating to a switch mounted for various operations mainly of an automobile. SOLUTION: In this constitution, a cam 7 and a terminal plate 11, held by a snap fit type mounting structure to an inner case 2, are built in by the fitting dimension of the internal wall surface dimension of an outer case 13 substantially the external surface dimension of a protrusion 5a of a support part 5 and a protrusion 9a of a support part 9. In this way, deformation of the support parts 5, 9 is regulated, to prevent deformation caused by aged shape change, external shock, or the like so as to surely hold a mounting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to various operation switches mounted in a vehicle compartment.

[0002]

2. Description of the Related Art A conventional switch of this type will be described with reference to FIGS.

In FIG. 1, reference numeral 21 denotes a sliding body which is slidably held by an inner case 22 and is constantly urged in the original position direction by a return spring 23, to which an operating portion 24 is attached. Reference numeral 25 denotes a cam that is rotatably held by a support portion 26 of the inner case 22 by a snap-fit type mounting structure and is further urged toward the inside of the inner case by a winding spring 27.
The push-lock mechanism means of the switch is formed by the pin 28 inserted in the sliding body 21.

Reference numeral 29 denotes a terminal plate which is insert-molded with the terminal 30 to form a circuit and which is held by the snap-fit type mounting structure on the supporting portion 31 of the inner case 22 and is mounted on the sliding body 21. The circuit contact means is configured to open and close the circuit with the contact piece 32. 3
Reference numeral 3 is an outer case provided with locking claws so as to be mounted inside a vehicle, and an inner case 2 in which various parts are mounted inside.
Holds 2.

[0005]

However, in the above-mentioned conventional switch, the cam 25 provided in the inner case 22 is provided.
Since the supporting portion 26 of No. 2 and the supporting portion 31 of the terminal board 29 utilize the elastic deformation region of the resin so that the snap fitting can be performed, the strength is very weak, and the CC cross section of FIG. As shown in FIG. 6 and FIG. 7 showing the DD cross section,
The holding portions of the outer case 33 and the inner case 22 are held by the guide portion 34 having a small fitting area in consideration of the dimensional variation due to the influence at the time of molding, and other portions are intentionally formed on the inner wall surface of the outer case 33. A gap was provided between the inner case 22 and the outer wall surface. Therefore, the amount of contact between the supporting part and the supported component is affected by changes in shape over time in a bad environment, deformation during assembly due to abnormal handling, shape changes due to variations in molding conditions, and instantaneous deformation due to external impact. There was a risk that parts could not be held and could fall out.

The present invention is intended to solve such conventional problems, and an object thereof is to provide an excellent switch capable of preventing the holding parts from falling off.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a protrusion on the outside of the tip of a support portion of a snap type mounting structure provided in an inner case, and further determines the outer surface dimension of the protrusion portion. The fitting dimensions are substantially the same as the inner wall surface dimensions of the outer case.

[0008]

Therefore, according to the present invention, a projection is provided on the outside of the substantially tip end of the support portion of the snap type mounting structure, and the outer surface dimension of this projection portion is set to a fitting dimension substantially the same as the inner wall surface dimension of the outer case. Since the inner wall surface of the outer case and the outer surface of the protrusion of the supporting portion are always in contact with each other due to a change in shape over time or a momentary deformation due to an external shock, the deformation is restricted and the base position state can be maintained.

Further, even with respect to deformation at the time of assembly due to abnormal handling, if the deformation is to some extent, it is corrected after the assembly,
It is possible to prevent the holding parts from falling off.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A switch according to an embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 1 denotes a sliding body which is slidably held by an inner case 2 and is constantly urged in a direction toward its original position by a return spring 3, and an operating portion 4 is attached thereto. 5
Is a support portion that is provided in the inner case 2 and rotatably holds a cam 7 that is biased inwardly by the coil spring 6 by a snap-fit type mounting structure. A projection 5a is provided on the portion.

Reference numeral 8 is a pin inserted in the sliding body 1, and the winding spring 6 and the cam 7 form a push lock mechanism means of this switch. 9 is provided in the inner case 2,
The terminal 10 is insert-molded to hold a terminal plate 11 forming a circuit by a snap-fit type mounting structure.
Is provided. Reference numeral 12 is a contact piece held by the sliding body 1, and constitutes a circuit contact means so that the circuit can be opened and closed with the terminal plate 11. Reference numeral 13 denotes an outer case provided with locking claws so as to be mounted in the interior of the automobile, and holds an inner case 2 on which various components are mounted inside.

Further, FIG. 2 showing the AA cross section of FIG.
As described above, the outer surface dimension of the protrusion 5a of the support portion 5 supporting the cam 7 and the inner wall surface dimension of the outer case 13 are incorporated as fitting dimensions of substantially the same dimension. -B
As shown in FIG. 3 showing a cross section, the outer surface dimension of the projection 9a of the supporting portion 9 supporting the terminal plate 11 and the inner wall surface dimension of the outer case 13 are also incorporated as substantially the same fitting dimensions.

FIG. 4 shows another embodiment, in which the crushing rib 1 having a size slightly larger than the inner wall surface size of the outer case 13 is further provided on the protrusion 9a of the supporting portion 9 in comparison with the above-described embodiment.
4 is provided. In this case, since the width dimension of the crushing rib 14 is larger than the inner wall surface dimension of the outer case 13, the crushing rib 14 is assembled in a press-fitted state when assembled, and is always abutted.

Incidentally, in FIG. 4, the projection 9a of the supporting portion 9 is formed.
Although the example in which the crushing rib 14 is provided in the above has been described, by providing the same crushing rib 14 in the protrusion 5 a of the support portion 5,
Needless to say, the effect is further increased.

[0016]

As is apparent from the above-described embodiment of the present invention, the cams and terminal plates held by the inner case by the snap-fit type mounting structure have the outer surface size of the projection of each support portion and the inner case of the outer case. Since the wall dimensions are built in with the fitting dimensions that are almost the same, the deformation of each support part is restricted,
This has the effect of preventing changes in shape over time, deformation due to external impact, deformation during assembly due to abnormal handling, etc., and the mounted components being held securely.

Further, by adding a crushing rib to each protrusion and making the width dimension larger than the inner wall surface dimension of the outer case, the supporting portion is always in contact with the inner wall, and it is possible to further prevent deformation. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a switch according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4A is a sectional view showing another embodiment of the present invention. FIG. 4B is an enlarged sectional view of the same main part.

FIG. 5 is an exploded perspective view showing a configuration of a conventional switch.

6 is a sectional view taken along line CC of FIG.

FIG. 7 is a sectional view taken along line DD of FIG. 5;

[Explanation of symbols]

 1 Sliding body 2 Inner case 3 Return spring 4 Operation part 5 Support part 5a Projection 6 Winding spring 7 Cam 8 Pin 9 Support part 9a Projection 10 Terminal 11 Terminal plate 12 Contact piece 13 Outer case 14 Crushing rib

Claims (2)

[Claims] 1. An inner case in which an operating member having a contact is slidably held, and a terminal plate and a cam member corresponding to the operating member are provided by a snap type mounting structure, and the inner case is mounted inside. A switch comprising an outer case, a protrusion corresponding to the inner wall surface dimension of the outer case provided substantially outside the front end of the support portion of the snap type mounting structure, and the outer surface dimension and the inner wall surface dimension of the outer case being substantially the same. 2. The switch according to claim 1, wherein a rib is provided on a protrusion provided substantially outside the tip of the support portion of the snap-type mounting structure, the rib having a dimension such that the outer diameter dimension is larger than the inner wall dimension of the outer case.