Key switch

Details Key switch Key switch

1991-03-01

1992-09-01

Recla, Henry J.

Electricity: circuit makers and breakers

Electric switch details

Actuators

200512, 200513, H01H 1370, H01H 110

Patent

active

051441039

ABSTRACT:
A push button switch includes an elastic sheet member serving as a stopper of an operation member and an elastic projection. When the operation member abuts with the projection, it is elastically deformed to absorb abutment impact to thereby cost effectively reduce noise when the push button switch is operated. A key switch includes a torsion bar, a key top and, an elastic sheet member having a projection. The play of a torsion bar at a bearing portion and at a coupling portion of the torsion bar with the key top is eliminated through a pushing force by the elastic sheet member having a projection, to thereby reduce noise and prevent trapping of a key stem by another component, when the key switch is operated.

REFERENCES:
patent: 4441000 (1984-04-01), Suwa
patent: 4493959 (1985-01-01), Viebrantz
patent: 4532575 (1985-07-01), Suwa
patent: 4590342 (1986-05-01), Schlegel
patent: 4611261 (1986-09-01), Suwa
patent: 4638151 (1987-01-01), Suwa
patent: 4641004 (1987-02-01), Keprda
patent: 4675787 (1987-06-01), Suwa
patent: 4681987 (1987-07-01), Suwa
patent: 4814561 (1989-03-01), Kawasaki

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