Electric pressure switch

Details Electric pressure switch Electric pressure switch

1988-08-04

1989-09-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250221, 362 95, 200314, G01D 534

Patent

active

048683841

ABSTRACT:
A dust and water tight electric pressure switch that is highly visible, even in a smoke filled area, includes a lightguide disc disposed between a ring-like cover and a cylindrical housing disposed behind a slightly depressible flexible zone at the center of the disc. The flexible zone covers the open front end of the housing. The disc is constructed of a light-collecting polycarbonate and is formed with relatively small light radiating surface to produce high contrast at the latter. Disposed within the housing is a contactless switch arrangement including a plurality of so-called light barrier units arranged about a light source, and an actuator extending from the rear of the flexible zone. A light shield carried by the actuator controls the amount of light which impinges on the light barrier units as a function of the position of the actuator as determined by how much the flexible zone is depressed.

REFERENCES:
patent: 3761919 (1973-09-01), Baumann
patent: 3906222 (1975-09-01), Astier et al.
patent: 4049964 (1977-09-01), Wuchinich et al.
patent: 4617461 (1986-10-01), Subbarao et al.
Busch-Jaeger Elektro GmbH, "Wie Man Mit Lichtschaltern Wohnraume Schoner Macht", Dec. 1987, pp. 8-9.

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