JPH0119782Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch suitable for a vehicle brake switch, clutch switch, etc.

Conventionally, as this type of switch, for example,
As shown in Japanese Patent No. 53-114075, a pair of fixed contact plates with their contact parts facing each other are fixed to a switch case, and one end is inserted between the two contact parts. In addition, an operating rod with the other end protruding outside the switch case is slidably fitted, and the operating rod is connected to a rod portion made of a conductive metal material and a pair of rods joined to the inner end of this rod portion. and an insulating synthetic resin covering part, the covering parts provide an insulating part that cuts off the connection between the two contact parts, and the inner end of the rod part provides a conductive part that makes the connection between the contact parts conductive. Although it is known that the synthetic resin covering portions are formed separately, the structure of the mold is complicated because there are two synthetic resin covering portions spaced apart from each other. Also, since the metal rod is exposed outside the switch case 1,
There is a need for special insulation between the rod and the pushing member that presses it, and there are problems such as the rod itself being easily rusted.Furthermore, there is a switch on the operating rod on the outer circumferential surface of the rod. It is necessary to protrude the flange part by metal processing to prevent it from coming out from the case, which is troublesome, and furthermore, when the metal flange part collides with the switch case, the collision noise is relatively loud. There is a problem.

This invention can solve all the above problems,
Furthermore, the object is to provide a switch that is easy to manufacture and process.

In order to achieve this object, the present invention fixes to a switch case a pair of fixed contact plates with their respective contact portions facing each other within the switch case, and interposes one end between the two contact portions. An operating lever with its other end protruding outside the switch case is slidably fitted therein, and a spring is provided between the operating lever and the switch case to bias the operating lever outward;
In a switch in which the operating rod is provided with a conductive part that can connect between both the contact parts and an insulating part that can interrupt the contact, the operating rod is connected to a rod part made of a conductive metal material and A covering part made of an insulating synthetic resin covers the entire outer surface of the rod part except for the inner end thereof, and the inner end of the rod part forms the conductive part, and the covering part forms the insulating part. The present invention is characterized in that a flange portion, which serves as means for preventing the operating rod from coming off from the switch case and as a seat for the spring, is integrally molded in the intermediate portion of the covering portion from the same material.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A switch case 1 consists of a hollow case body 2 and a contact mounting plate 3 fitted into an opening of the case body 2. A pair of fixed contact plates 4 are fixed to the contact mounting plate 3, and the portions of each fixed contact plate 4 that protrude from the contact mounting plate 3 to the outside are formed into opposing connection terminals 4a, which are connected to the inside of the case body 2. The portions located at are formed as opposing contact portions 4b.

On the side opposite to the contact mounting plate 3, the case body 2
A hollow threaded cylinder 5 for mounting a switch is provided protruding from the end wall. An operating rod 6 is slidably supported on the threaded cylinder 5, one end of which protrudes into the case body 2, and the other end protrudes outside the threaded cylinder 5.

The operating rod 6 includes a rod portion 7 having a large-diameter inner end 7a made of a conductive metal material and a long small-diameter shaft portion 7b integral with the rod portion 7, and a rod portion 7 having a large-diameter inner end 7a formed of a conductive metal material, and a rod portion 7 having a large-diameter inner end 7a formed of a conductive metal material and a long small-diameter shaft portion 7b integral with the rod portion 7. The cover part 8 is made of an insulating synthetic resin and is coated with a cover part 8 made of an insulating synthetic resin. An annular flange portion is provided at the intermediate portion of the covering portion 8 in the axial direction of the operating rod, which serves as a sliding guide for the operating rod 6, a seat for a return spring 13 (described later), and a means for preventing the operating rod 6 from coming off from the switch case 1. 8a are integrally molded from the same material, and a small diameter shaft portion 7b located outside the flange portion 8a is slid into a small diameter hole 9 located on the outer end side of the threaded cylinder 5. The covering portion 8 having the flange portion 8a can be easily formed on the outer peripheral surface of the small diameter shaft portion 7b using a mold.

A recess 11 is formed in the inner surface of the end wall of the case body 2 so as to surround the open end of the large diameter hole 10 of the screw cylinder 5, and the small diameter shaft portion 7b of the operating rod 6 is inserted into the recess 11.
An annular retainer 12 passing through is fitted. A return spring 13 is compressed between the retainer 12 and the flange portion 8a of the operating rod 6.

The inner end 7a of the operating rod 6 made of metal material is a conductive part C.
On the other hand, the portions of the covering portion 8 adjacent to the inner end 7a form insulating portions I, and when the operating rod 6 is inactive, the flange portion 8a closes to the large diameter hole due to the elastic force of the return spring 13. The conductive portion C is inserted and held between both contact portions 4b to connect them. Then, when the operating rod 6 is pushed in and the insulating part I is positioned between both the contact parts 4b, the space between them is cut off.

As described above, according to the present invention, a pair of fixed contact plates are fixed to a switch case with their respective contact portions facing each other within the switch case, and one end is inserted between the two contact portions. An operating rod whose other end protrudes outside the switch case is slidably fitted, and a spring is provided between the operating rod and the switch case to bias the operating rod outward. In the switch, the operating rod is provided with a conductive part that can connect between both the contact parts and an insulating part that can cut off the contact part, and the operating rod is a rod part made of a conductive metal material;
A covering part made of insulating synthetic resin covers the entire outer surface of the rod part except for its inner end, and the inner end of the rod part serves as the conductive part, and the covering part serves as the insulating part, respectively. A flange portion, which serves as a means for preventing the operating rod from being removed from the switch case and a seat for the spring, is integrally molded from the same material in the intermediate portion of the covering portion, so that the outer surface of the metal rod portion is The operating rod with the flange portion can be easily obtained by integrally molding a single synthetic resin covering portion except for the inner end thereof, and therefore the structure of the mold for the covering portion can be simplified. Moreover, there is no need to perform special metal processing to form the flange portion, which facilitates manufacturing and contributes to cost reduction.
In addition, the entire outer surface of the metal rod except for the conductive part at the inner end is continuously covered with a synthetic resin coating, so that the rod and the pushing member that presses it can be easily connected to each other. There is no need to interpose a special insulating means in between, and the rod is not exposed outside the switch case, which is advantageous in terms of rust prevention. The sliding surface of the case is covered with a synthetic resin so that it can always slide smoothly against the case, and the flange part, which serves as a means to prevent the case from coming off, is made of synthetic resin. The impact noise can be reduced.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional side view of an embodiment of the present invention. C... Conductive part, I... Insulating part, 1... Switch case, 4... Fixed contact plate, 4b... Contact part, 6
...Operating rod, 7...Role part, 7a...Inner end, 8...
Covering portion, 8a...flange portion, 13... return spring.

Claims (1)

[Scope of utility model registration request] A pair of fixed contact plates 4 with their respective contact portions 4b facing each other are fixed to the switch case 1 within the switch case 1, and one end is inserted between the two contact portions 4b, and the other end is inserted into the switch case 1. An operating rod 6 protruding from the case 1 is slidably fitted, and the operating rod 6 is fitted between the operating rod 6 and the switch case 1.
A spring 13 is provided to urge the operating rod 6 outward.
In this switch, the operating rod 6 is connected to a rod portion 7 made of a conductive metal material, in a switch provided with a conductive portion C that can connect between both the contact portions 4b and an insulating portion I that can cut off the contact portions. The outer surface of this rod part 7 is
The conductive part C is formed by the inner end 7a of the rod part 7, and the insulating part I is formed by the covering part 8. A flange part 8a, which also serves as a means for preventing the operating rod 6 from being removed from the switch case 1 and a seat for the spring 13, is integrally molded in the middle part of the covering part 8 from the same material. Switch.