Operating unit for a key switch

Details Operating unit for a key switch Operating unit for a key switch

1994-11-03

1996-02-20

Kashnikow, Andres

Electricity: circuit makers and breakers

Electric switch details

Cases and bases

2003021, 200341, 200345, 200512, H01H 1306

Patent

active

054930871

ABSTRACT:
A key switch operating unit having an elastic cylinder hermetically interposed between the top surface of a housing and the lower surface of a flange portion of a key stem, and a rubber bottom cover covering the lower opening of the housing so as to define an airtight inner space. The housing has an inner partition wall and an outer peripheral wall to define a dust protective space. Small foreign substances such as dust and liquid tending to enter into the inside of the housing when operating the key switch can be prevented from entering.

REFERENCES:
patent: 4527030 (1985-07-01), Oelsch
patent: 4806908 (1989-02-01), Krupnik

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