Push button for an inductive value input keyboard

Details Push button for an inductive value input keyboard Push button for an inductive value input keyboard

1988-05-31

1989-08-01

Kozma, Thomas J.

Inductor devices

Relatively movable core and coil

336136, 341 32, H01F 2100

Patent

active

048536660

ABSTRACT:
A push button for an inductive value input keyboard having a push-button socket, a push-button head guided in the push-button socket, a compression spring which acts between the push-button socket and the push-button head, a stop which limits the stroke of the push button in the non-actuated state, and a rod-shaped iron core fastened to the push-button head for interaction with an induction coil formed by conductor paths upon a printed circuit board on which the push button is arranged. A sleeve is molded at the push-button head and has a non-cylindrical aperture therethrough and is elastically deformable transverse to its axis within which the iron core is clamped.

REFERENCES:
patent: 3911429 (1975-10-01), Vinal
patent: 4117438 (1978-09-01), Kim
patent: 4307366 (1981-12-01), Fujita

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