Computer key switch

Details Computer key switch Computer key switch

1992-06-09

1993-05-11

Burr, Edgar S.

Typewriting machines

Key-board or key lever-actuating mechanism

Key-cap or key-stem structure

400472, B41J 512

Patent

active

052095886

ABSTRACT:
A computer key switch comprised of a key cap, a key base and a rubber cone, wherein the key cap has two bottom walls movably inserted into two elongated chambers on the key base, two hooked strips movably inserted into two opposite openings on the key base for upstroke limit control, and a plunger inserted through a ring-shaped holder on the key base and forced to squeeze the rubber cone; the key base has a bottom flange and two opposite side blocks for positioning on a frame; the rubber cone has a horn-shaped bottom ring supported on a membrane, a top ring inserted into the ring-shaped holder, a transverse division wall blocked between the top ring and the horn-shaped bottom ring, and a solid stub rod extended downwards from the transverse division wall at the center to trigger a circuit inside the membrane upon each down stroke of the plunger.

REFERENCES:
patent: 4363942 (1982-12-01), Deeg et al.
patent: 4421432 (1983-12-01), Lieb
patent: 4773780 (1988-09-01), Hochgesang
Duranske, "Keyboard Assembly" Feb. 1978, IBM Technical Disclosure Bulletin, vol. 20, No. 9.

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