Signal input devices and systems

Details Signal input devices and systems Signal input devices and systems

1975-05-16

1977-04-26

Rubinson, Gene Z.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

340 19R, 340380, B66B 300

Patent

active

040196070

ABSTRACT:
Signal input devices and systems which include a switch, a continuously energized light source, and an electro-optic light valve disposed between the back of the switch and the light source. The electro-optic light valve is operable between light transmitting and light blocking conditions, with the electro-optic light valve being switched from one of its conditions to the other in response to actuation of the switch. The switch is constructed to enable light from the light source to be visible on the front or actuating side of the switch when the electro-optic light valve is light transmissive. A plurality of devices may be grouped with a common light source, to provide an electronic keyboard, or other signal input station or panel. A specific application of a group of signal input devices used as a call input station in an elevator system is also disclosed.

REFERENCES:
patent: 1738489 (1956-03-01), Borden
patent: 2525768 (1950-10-01), Bruns
patent: 2525769 (1950-10-01), Bruns
patent: 3686686 (1972-08-01), Hall
patent: 3899786 (1975-08-01), Greubel et al.

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