Typewriting machines – Key-board or key lever-actuating mechanism – Including means generating a signal for type selecting or...
Patent
1979-11-29
1982-02-02
Wright, Jr., Ernest T.
Typewriting machines
Key-board or key lever-actuating mechanism
Including means generating a signal for type selecting or...
4004912, 200159R, 200276, B41J 508
Patent
active
043136850
ABSTRACT:
A push-button key switch for keyboards, having an actuating member, and a helical spring which functions as a return spring for the actuating member and as a movable contact element. The helical spring comprises two sections, one of which is employed as the return spring, and which engages a seating surface on the actuating member. The other section of the spring extends beyond the seating surface and is adapted to engage a cooperable stationary counter-contact upon actuation of the actuating member. The switch may be readily designed as a single pole-single throw switch or a single pole-double throw switch, and may be designed to provide predetermined contact pressures between closed contacts.
REFERENCES:
patent: 1610835 (1926-12-01), Westburg et al.
patent: 1629896 (1927-05-01), Valerius
patent: 3379851 (1968-04-01), Weremey
patent: 3842229 (1974-10-01), Boulanger
patent: 3842230 (1974-10-01), Kashio et al.
patent: 3964593 (1976-06-01), Pointon
patent: 4092503 (1978-05-01), Raeder
patent: 4209682 (1980-06-01), Rood
Stahl Horst
Wachs Walter
Siemens Aktiengesellschaft
Wright, Jr. Ernest T.
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