U.S. Utility Patent 3,699,296 (US3699296A)

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Provided by the ASK Keyboard Patents database

Applied 21st May 1971

Published 17th October 1972

Expired 17th October 1989

More informaion

Name	Catastrophically buckling compression column switch and actuator
Inventors	Richard H. Harris
Assignees	IBM
Description	An invention of a keyswitch actuator comprised of a metal coilspring that buckles after some compression, providing an immediate force to actuate something with. This is the original buckling spring patent, which was refined in 1977 (US4118611A) and 1983 (US4528431A).

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