Surveillance signal apparatus

Details Surveillance signal apparatus Surveillance signal apparatus

1984-09-13

1986-07-15

Moy, Magdalen Y. C.

Illumination

Housing

362204, 362267, 362294, F21V 2900

Patent

active

046009779

ABSTRACT:
The surveillance signal apparatus is preferably provided a signal lamp, as an illuminated switch or as an illuminated key. It comprises a casing with electrical and electronic connections and with an apparatus heat disengageably disposed at the casing. The apparatus head comprises a signal part provided with electric voltage and preferably an illuminating element. A voltage limiter and a current limiter are disposed in an explosion-proof and pressure tight encapsulated space of the casing and they are electrically predisposed to the signal part in the apparatus head via a feed part. The apparatus head with the signal part and the feed part are formed by the output of the voltage limiter and by the output of the current limiter as an explosion protection self safety unit.

REFERENCES:
patent: 4388681 (1983-06-01), Meyer
patent: 4435744 (1984-03-01), Russo
patent: 4466050 (1984-08-01), Lockard

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