Push-button switch with multi-stage action

Details Push-button switch with multi-stage action Push-button switch with multi-stage action

1987-08-04

1989-03-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

341 31, G01D 534

Patent

active

048166715

ABSTRACT:
A push-button switch including a housing, at least one pair of push-buttons movably mounted in the housing, a plurality of light-emitting elements, a plurality of photo-sensors arranged to receive light from the light-emitting elements and light blocking members on the push buttons for selectively blocking light received by the photo-sensors. The buttons are spaced apart in a longitudinal direction and each includes a light blocking member which is movable with the push-button from a non-operating position to a plurality of signal sending positions in a vertical direction perpendicular to the longitudinal direction. The light-blocking members are spaced apart in a lateral direction perpendicular to the longitudinal and vertical directions and overlap in the longitudinal direction. The light-blocking members are shaped to allow light emitted from at least one light-emitting element to be received by the respective photo-sensor element when at least one of the push-buttons is in each of the signal sending positions.

REFERENCES:
patent: 3123724 (1964-03-01), Schrenk et al.
patent: 3465099 (1969-09-01), Harris
patent: 3668407 (1972-06-01), Matzen et al.
patent: 3946225 (1976-03-01), Beeck
patent: 4379968 (1983-04-01), Ely et al.
patent: 4429219 (1984-01-01), Yochum et al.

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