Key assembly

Details Key assembly Key assembly

1996-09-23

1998-07-07

Gellner, Michael L.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200517, H01H 1370

Patent

active

057772819

ABSTRACT:
A key assembly comprising a base; a manually operable key secured to, and mounted above the base by, a resilient key mat having an upstanding wall. The key is moveable against the resilience of the upstanding wall towards the base. A guide assembly extends between the base and the key to guide movement of the keys. A membrane is supported on the base and carries a pair of electrically insulated first contacts, each first contact of the pair being connected to a respective electrical track supported on the membrane and extending to a connection location. A second contact is provided on the underside of the key or the key mat and has a size and position such that movement of the key towards the base causes the second contact to engage both first contacts and thereby electrically connect the first contacts.

REFERENCES:
patent: 3721778 (1973-03-01), Seeger, Jr. et al.
patent: 5034573 (1991-07-01), Bonmassari et al.
patent: 5115106 (1992-05-01), Weiland et al.
patent: 5256843 (1993-10-01), Chiba et al.
patent: 5298706 (1994-03-01), English et al.
patent: 5310973 (1994-05-01), Lee
patent: 5438177 (1995-08-01), Fagan
patent: 5525979 (1996-06-01), Engle et al.

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