JPH0323622Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention relates to electrical switches such as relays and micro switches.

[Background technology]

FIG. 1 shows a conventional example. In the figure, 1 is a fixed terminal, 2 is a fixed contact, 3 is a movable piece, 4 is a movable contact, 5 is a base, and 6 is a cover (case) that covers the contact portion.

When such an electric switch is repeatedly opened and closed for a long period of time, the contact material becomes powder due to the arc and impact generated during opening and closing, scatters around, falls on the upper surface of the base 5, and accumulates. If the contact material m, ie, the conductive substance, accumulates between the fixed terminals 1, 1, the withstand voltage between the terminals decreases, and depending on the case, there is a risk of burnout or the like.

[Purpose of invention]

The purpose of this invention is to provide an electrical switch that prevents the accumulation of scattered contact material at specific locations and controls a drop in withstand voltage between terminals.

[Disclosure of the invention] The electrical switch of this invention has a hole provided in the cover near the periphery of the mechanical contact portion, and an adhesive tape is attached to the outer surface of the cover to cover the hole.

An embodiment of this invention will be described based on FIGS. 2 and 3. Terminals 8, 8 are provided on the base 5, and conductors 9, 9 are connected to the terminals 8, 8.
A bimetal 10 is provided directly above and near the terminal 8 and the conductor 9. The bimetal 10 includes a movable piece 12 around which a heater 11 is wound, a movable contact 13 at its tip, a fixed terminal 14 parallel to the movable piece 12, and a fixed contact 15 at its tip. The mechanical contact part A is covered with a cover (case) 6, a hole 16 is formed in the cover 6 directly above the contact part A, and an adhesive tape 17 is adhered to the outer surface of the cover 6 so as to cover this hole 16. There is.

This embodiment suppresses a decrease in withstand voltage of the other terminals 8, 8 rather than suppressing a decrease in withstand voltage of the bimetal 10 that scatters the contact material m. Of the contact material (powder) m scattered when the contact is opened and closed, the material that is scattered upward is attached to the adhesive tape 17 and does not fall onto the upper surface of the base 5.
Therefore, the amount of contact material m accumulated between the terminals 8, 8 is significantly smaller than in the conventional example, assuming the same period. That is, the decrease in the withstand voltage between the terminals is significantly suppressed, and the risk of burnout and the like is eliminated, and the life of the electrical switch can be greatly extended. In addition, by appropriately replacing the adhesive tape 17, its adhesion performance can be maintained at a high level, and by removing the contact material m on the base 5 during replacement, it is possible to significantly extend the life of the electrical switch. Become.

[Effect of idea]

According to the electrical switch of this invention, the life span of the electrical switch can be extended by lowering the accumulation rate of scattered contact material, which causes a decrease in the withstand voltage between the terminals.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is a sectional view of an embodiment of this invention, and Fig. 3 is a -
It is a sectional view taken along the line. A...Mechanical contact part, 6...Cover (case),
16...hole, 17...adhesive tape.

Claims (1)

[Scope of utility model registration request] A cover, a mechanical contact portion provided in the cover, a hole provided near the periphery of the mechanical contact portion of the cover, and an adhesive tape affixed to the outer surface of the cover to cover the hole. Electric switch.