Operating key switch unit

Details Operating key switch unit Operating key switch unit

1990-01-16

1990-12-25

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

2003022, 361399, H01H 1306, H05K 500

Patent

active

049805223

ABSTRACT:
The operating key switch unit according to the present invention includes a plurality of key switch buttons exposed from the front of a waterproof case and a switch panel integrally formed therein using an elastic material and mounted with bolts between the waterproof case and a printed circuit board. Furthermore, a first contactor projecting in the key switch button operating direction annularly in a surrounding relation to the key switch buttons is provided, and a second annular contactor formed integrally with the switch panel and in contact with the first contactor throughout the overall circumference at all times is provided.

REFERENCES:
patent: 4074118 (1978-02-01), Washizuku et al.
patent: 4117279 (1978-09-01), Schomer
patent: 4491702 (1985-01-01), Kato
patent: 4570039 (1986-02-01), Osawa et al.
patent: 4768230 (1988-08-01), Viebrantz et al.

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