Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1976-01-26
1977-06-07
Curtis, Marshall M.
Communications: electrical
Audible indication
Percussion-type sound producer
178 79, 340365R, 178101, G08C 100
Patent
active
040286967
ABSTRACT:
A keyswitch for a keyboard which may generate either a first signal or a second signal is formed by a pair of saturable magnetic cores and corresponding drive and sense line wires that are molded into a unitary support assembly in a keyswitch housing. A plunger and a magnet assembly that is depressible relative to the housing and which supports at least one permanent magnet and a pair of compressible springs allows for the unsaturation of one core and the compression of one spring upon depression of the plunger to a first position and for the unsaturation of the second core by the compression of the second spring upon further depression of the plunger and magnet assembly to a character second position.
REFERENCES:
patent: 3407396 (1968-10-01), Lukianov
patent: 3698531 (1972-10-01), Bernin
patent: 3911429 (1975-10-01), Vinal
Engstrom Keith Allen
Madland Robert Christen
Zielinski, Jr. Robert Michael
Beart Robert W.
Bowen Glenn W.
Curtis Marshall M.
Illinois Tool Works Inc.
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