Switch, botton switch and rotation switch

Abstract

The present invention is provided with a contact switching mechanism having a movable contact member that is bent into a U shape, allowed to press and contact a fixed contact member side, and supported so as to freely tilt and move thereon. In this mechanism, a switching operation is carried out between contacts by reversing the movable contact member in a see-saw manner, with a tilt-movement fulcrum portion of the movable contact member being always in contact with the contact portion of the common fixed contact member. The movable contact member is allowed to have a spring function conformed to elastically shift in response to a switching operation in addition to a contact function that is inherent to the movable contact member so that it is possible to provide a switch having high reliability, such as a push-button switch and a rotary-lever switch, which can cut costs by reducing the number of parts, and ensure a superior contacting property.

Description

technical field [0001] The present invention relates to a switch for a door switch of a refrigerator, and more particularly, to a switch, a push button switch and a rotary switch capable of achieving reduced number of parts and stable contact performance. Background technique [0002] Generally speaking, a switch used in household appliances, such as a switch assembled on a household refrigerator, also has the switch function of turning on and off the electric light in the refrigerator and turning on and off the cooling motor when opening and closing the refrigerator door. [0003] As a necessary condition of the door switch, when the door switch is installed on a household refrigerator, due to the dimensional error between the shape of the door switch itself and the shape of the recessed part of the refrigerator installation position, the protrusion amount of the operation part (actuator) for the push operation is different. Therefore, the operation It is difficult to ensur...

AI Technical Summary

Problems solved by technology

[0012] However, in this SPDT type switch, when only one contact structure of normally closed or normally open is selected, although the other contact structure of the unused side is not used at all, the unused contact is still installed. parts, it forms an uneconomical door switch, which also occupies a relatively high proportion in terms of cost

[0013] For this reason, it is considered to omit the contact parts on the unused side in advance. At this time, the space saved by not using a contact part will be generated in the housing, and the movable contact piece opposite to this space cannot be obtained due to excessive tilting. The normal amount of movement, the result is that the position of the movable contact piece is shifted, which is prone to failures that destroy the balance of the contact structure and degrade the contact performance

Therefore, at this time, it is necessary to add correction parts such as balance contacts to prevent excessive tilting of the movable contact piece. For mass-produced switches, adding one part will greatly affect the production cost, so it is desirable to develop switches with fewer balance contacts.

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