Signal input devices and systems

Details Signal input devices and systems Signal input devices and systems

1975-05-16

1977-05-10

Schaefer, Robert K.

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

040222969

ABSTRACT:
Signal input devices and systems which include a switch, a continuously energized light source, and an electro-optic light value disposed between the back of the switchand 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 includes a printed circuit board having an opening therein, with certain of the electrically conductive elements of the switch being disposed on the printed circuit board. The opening in the printed circuit board enables light from the light source to be visible from the front side of the switch, such as through a light transmissive actuating button, when the electro-optic light valve is in its light transmitting condition. A plurality of signal input devices may be grouped, with a common light source. A specific application of a plurality of signal input devices used as a call input station in an elevator system, is also disclosed.

REFERENCES:
patent: 2525768 (1950-10-01), Bruns
patent: 2525769 (1950-10-01), Bruns
patent: 2738489 (1956-03-01), Borden
patent: 3686686 (1972-08-01), Hall
patent: 3899786 (1975-08-01), Greubel et al.

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