Typewriting machines – Key-board or key lever-actuating mechanism – Including means generating a signal for type selecting or...
Patent
1982-08-30
1984-11-06
Sewell, Paul T.
Typewriting machines
Key-board or key lever-actuating mechanism
Including means generating a signal for type selecting or...
4004912, 200 67D, 200 67DA, 200 5R, 200159A, B41J 508, H01H 2104, H01H 312
Patent
active
044809379
ABSTRACT:
A keyswitch apparatus for electronic typewriter keyboards and the like including a circuit board having at least one pair of electrical conductors, each conductor having contact means, at least one single-piece spring and contact system, each including a frame portion adapted for directly mounting to the circuit board and at least one spring and contact unit. Each spring and contact unit is associated with an associated pair of circuit board conductors, maintains direct electrical contact with the contact means of a first one of the conductors of the pair and includes a base section connected to the frame portion and bent into a longitudinal channel form, a leaf spring member cantilevered upwardly from the base section and having flat spring means urging the first extension section upwardly relative to the static board, and a contact member cantilevered downwardly from the base section for providing direct electrical contact with the contact means of the second one of the conductors of the pair when a pre-established downward force is exerted on the cantilevered end of the leaf spring member. The base and leaf spring member urge the second extension section apart from the contact means of the second static board conductor of the pair. There are means for depressing the cantilevered end of the first extension section to straighten the channel of the base section and thereby lower the second extension section to make direct electrical contact with the contact means of the second static board conductor of the pair.
REFERENCES:
patent: 1215665 (1917-02-01), Landis
patent: 3800104 (1974-03-01), Lien et al.
patent: 4278855 (1981-07-01), Rossi
patent: 4341934 (1982-07-01), Muller
patent: 4363942 (1982-12-01), Deeg et al.
patent: 4386240 (1983-05-01), Philipp et al.
patent: 4394553 (1983-07-01), Feil
Cohen Jerry
Sewell Paul T.
Wiecking David A.
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