JP2567288Y2 - Sliding switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a sliding switch which performs a switching operation by sliding contact between a fixed contact and a movable contact embedded in a base.

[0002]

2. Description of the Related Art Conventionally, as this type of sliding switch,
For example, a technique according to Japanese Utility Model Laid-Open Publication No. 56-28119 is generally used. In this method, a plurality of contact portions having a contact surface are embedded on the same surface of an insulator, and a movable contact slides on the contact surfaces of the plurality of contact portions to perform a switching action. With such a configuration, each contact portion can be integrally molded with the resin molding die.

[0003]

However, in the above-mentioned prior art, there is a fear that abrasion powder generated by the switching action of the movable contact remains on the insulator surface, resulting in poor insulation of the contact portions. In order to solve such a problem, it is conceivable to caulk and fix a plurality of fixed contacts so as to protrude above the surface of the insulator as in the technique according to Japanese Utility Model Publication No. 2-27475. Production man-hours increased. Further, a configuration in which these fixed contacts are simply formed integrally with the insulator without caulking fixation can be considered, but since the height of the insulator and each fixed contact are different, the fitting between the resin molding die and each fixed contact is performed. It is difficult to fit, and very precise fitting accuracy is required. The present invention has been devised in view of the above problems, and a plurality of fixed terminals are easily arranged on a base without causing an increase in production man-hours. It is intended to provide a switch.

[0004]

According to the present invention, in order to achieve the above object, a plurality of fixed contacts having a contact surface are embedded on the same surface of a base, and a movable contact is a contact surface of the plurality of fixed contacts. A sliding switch that slides on the base and has a ridge between the plurality of fixed contacts.
And becomes, the projecting ridges inter has a recess for accommodating form shape <br/> abrasion powder generated by the contact action of the fixed contact and the movable contact, said recess, and a substantially middle position of the recess width Of the ridge
A triangular shape that extends in the circumferential direction with the circumferential end face as the base end.
The sliding switch is characterized in that a separating projection is formed .

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Reference numeral 1 denotes a sliding switch. The sliding switch 1 includes a rotatable movable plate 4 having a rotating shaft 2 and a movable contact 3 and a plurality of fixed contacts 5 with which the movable contact 3 slides. It comprises a base 6 and a plurality of connection conductors 8 having one end connected to the fixed contact 5 and the other end connected to the connector terminal 7. More specifically, the rotating shaft 2 and the movable platen 4 are integrally formed of a resin material. The movable platen 4 has three concave portions 4a, and each of the concave portions 4a has a return spring 4b. doing. The movable contact 3 is elastically supported by the return spring 4b.

The base 6 has a contact surface on the same surface, and a plurality of concentric fixed contacts 5 having an arc shape are embedded therein.
It is molded integrally with resin material. As shown in FIG. 2, the base 6 is provided between the fixed contacts 5 and 5 which are separated in the diameter direction.
A ridge 6a protruding from the contact surfaces of these fixed contacts 5 and 5 by a height H is formed. Furthermore, the base 6 faces the circumferential end face 6b of the ridge 6a, forms a recess 6c between the plurality of fixed contacts 5, 5, and wears when the movable contact 3 and the fixed contact 5 come into contact with each other. The powder 9 is stored. The recess 6c forms a separation protrusion 6d for dividing the stored wear powder 9 between the plurality of fixed contacts 5 and 5. The separation projection 6d is formed, for example, on the circumferential end face 6 of the projection 6a.
It is formed in a substantially triangular plate shape extending in the circumferential direction with b as a base end.

The separation protrusion 6d is provided at a recess width in the recess 6c, that is, at a substantially intermediate position between the fixed contacts 5 and 5, and can extend to near the upper end surface of the protrusion 6a. desirable.

Next, the operation of the sliding switch 1 having the above configuration will be described. When the movable platen 4 rotates left and right, the movable contact 3 slides on the contact surface of the corresponding fixed contact 5 to perform a switching action. As shown in FIG. 4, this switching action is such that the movable contact 3 conducts with the fixed contact 5 at the position 3a, and when it moves to the position 3b, it comes into contact with the circumferential end face 6b and rides on the ridge 6a to become non-conductive. This is performed by moving to the position 3c. Therefore, the movable contact 3 performs a switch ON-OFF operation based on the position 3b.

By the way, abrasion powder 9 is generated due to the contact action between the movable contact 3 and the fixed contact 5, and the abrasion powder 9 is moved and dropped into the recess 6 c by the movable contact 3. The wear powder 9 that has fallen into the recess 6c is separated and stored by the separation protrusion 6d. Therefore, there is no possibility that conduction between the adjacent fixed contacts 5 and 5 due to the abrasion powder 9 causes insulation failure and a short circuit phenomenon.

In the above embodiment, the separation protrusion 6d
Is not limited to a plate shape, and it is sufficient that the abrasion powder 9 stored in the concave portion 6c can be separated so as not to conduct between the adjacent fixed terminals 5,5. Such a sliding switch is most suitable for an inhibitor switch for detecting a shift position of a transmission of an automobile.

[0011]

[Effects of the Invention] As described in detail above, according to the configuration of the present invention, a plurality of fixed terminals are easily arranged on a base without increasing the number of production steps, thereby preventing insulation failure and short circuit phenomenon due to abrasion powder. , A sliding switch can be provided.

[Brief description of the drawings]

FIG. 1 is an assembled sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of a base in FIG. 1;

FIG. 3 is an enlarged perspective view of a main part around a recess in FIG. 2;

FIG. 4 is an enlarged cross-sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sliding switch 3 Movable contact 5 Fixed contact 6 Base 6c Depression 6d Separation protrusion 9 Wear powder

Claims (1)

(57) [Scope of request for utility model registration] 1. A sliding switch in which a plurality of fixed contacts having a contact surface are buried on the same surface of a base, and a movable contact slides on a contact surface of the plurality of fixed contacts to perform a switching action. Has a ridge between the plurality of fixed contacts.
Ri, projecting ridges mutual will form a form a recess for accommodating the wear powder generated by the contact action of the movable contact throat the fixed contact, said recess is a circumferential substantially intermediate position and the projecting portions of the recess width direction
Sliding switch, characterized in that the formation of the separation protrusions formed of substantially triangular extending in the circumferential direction of the end surface as a base end.