British Utility Patent 1,363,777 (GB1363777A)

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Provided by the ASK Keyboard Patents database

Patent diagrams of IBM's toggle switch at rest (left) and pressed (right)

Applied 21st August 1972

Published 14th August 1974

More informaion

Name	Toggle mechanism
Inventors	Richard H. Harris, Robert J. Wolfrom
Assignees	IBM
Description	An invention of a keyswitch that uses a cantilever snap mechanism to provide an actuator for a capacitance-sensing PCB. The mechanism is a leaf spring and a blade spring coupled together; the former is bent to push a capacitive plate towards at rest and then snaps to an inverted position to lift the plate when force is applied. This was implemented as the IBM beam spring used on all Model B family keyboards.

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