Electricity: circuit makers and breakers – Solid contact – Push button operated
Patent
1989-07-28
1991-02-05
Cusick, Ernest G.
Electricity: circuit makers and breakers
Solid contact
Push button operated
200559, 200345, H01H 1314, H01H 312
Patent
active
049907310
ABSTRACT:
A pushbutton switch for use in a keyboard attached to a computer system, word processor, electric typewriter, etc., is implemented to give the operator both a tactile feel and a click sound when a key is entirely depressed. The switch comprises a housing, an actuating arm, a stem and a leaf spring mechanism. The leaf spring has an upright portion with a hook, a bent portion, a spring portion and a protruding portion. It is mounted in the housing such that when the stem is partially depressed, it forces the upright portion to slant toward the inner surface of side wall of the housing and the spring portion to be compressed. When the spring is depressed beyond a certain position, the protruding portion of the leaf spring slips off the ledge of the step portion of the side wall of the housing, causing the bent portion to snap toward and collide with the outer surface of the stem, thus producing the desired click sound.
REFERENCES:
patent: 3464532 (1969-09-01), Tibbetts
patent: 3866006 (1975-02-01), Westram
patent: 4479040 (1984-10-01), Denley et al.
patent: 4553009 (1985-11-01), Van Zeeland et al.
patent: 4642433 (1987-02-01), Murata
Hsieh Lung-Sherng
Liao Ben
Wu Win
Acer Incorporated
Cusick Ernest G.
Kupferschmid Keith
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