Keyswitch

Details Keyswitch Keyswitch

1979-09-17

1981-03-10

Little, Willis

Electricity: circuit makers and breakers

Liquid contact

Time delay

200153LA, 200340, 200281, H01H 312, H01H 1352

Patent

active

042556350

ABSTRACT:
A keyswitch includes a tubular plunger with a rectangular body slidably mounted in a rectangular housing that has a bottom wall provided in its top with a circular recess receiving the lower end of a coil spring extending up around a pair of upright spring contact strips, the lower ends of which are press fitted in 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 a keycap on the upper end of the plunger is pushed down to lower the plunger. The plunger body has legs extending downwardly from its lower corners which engage the area of the housing between the plunger body and bottom wall of the housing while the plunger is in its upper position. The corners of the bottom walls are provided with downwardly extending sockets for receiving the plunger legs when the keycap is depressed.

REFERENCES:
patent: 3902032 (1975-08-01), Koepke

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