Keyswitch

Details Keyswitch Keyswitch

1980-08-08

1982-08-03

Shepperd, John W.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200246, 200283, H01H 126, H01H 1352

Patent

active

043428924

ABSTRACT:
A keyswitch includes a tubular plunger with a body slidable vertically in an open-top housing that has a bottom wall supporting the lower end of a coil spring extending up around a pair of opposed upright spring contact strips, the lower ends of which extend through the bottom wall. The inside of the plunger is provided with a cross member that normally separates the upper ends of the contact strips, but permits them to engage each other when the plunger is pushed down. The contact strips are substantially identical. Each has at least two parallel slits extending downwardly from its upper end to form a plurality of narrow contact fingers beside a wider contact finger that is wide enough to be engaged by the narrow contact fingers of the opposing contact strip.

REFERENCES:
patent: 259825 (1882-06-01), Davis
patent: 2332554 (1943-10-01), Bolley
patent: 3751618 (1973-08-01), Hallenberg
patent: 3902032 (1975-08-01), Koepke

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