Self-contained maintenance-free emergency lighting

Details Self-contained maintenance-free emergency lighting Self-contained maintenance-free emergency lighting

1976-07-22

1978-01-31

Hix, L. T.

Illumination

Automatic substitution of power supply or light source

315 86, 174 52R, 307 66, 340214, F21V 1904, H05B 3700

Patent

active

040717496

ABSTRACT:
A self-contained maintenance-free emergency lighting system involving a housing including a tough plastic cover so as to protect the system from vandalism; in order to test the system to determine whether it is operating properly, i.e., such that the emergency battery supply will furnish power to the emergency lamp, a magnetically operated test switch is included within the housing. By such feature, no external projection of a switch or the like is required. An arrangement is also provided for allowing the emergency lamp or bulb to float; that is to say, to preclude any kind of shock to the dome or cover from causing breakage of such lamp. Also, the plastic dome is extremely difficult to remove in that a tamper-proof screw is provided which is not readily visible nor is it readily accessible. An electrical circuit arrangement is also provided which includes a transfer relay which is normally open.

REFERENCES:
patent: 3159755 (1964-12-01), Duncan
patent: 3219811 (1965-11-01), Young
patent: 3315074 (1967-04-01), Buzan et al.
patent: 3668418 (1972-06-01), Godard
patent: 3673912 (1972-07-01), Herr
patent: 3833817 (1974-09-01), Patel
patent: 3860829 (1975-01-01), Fabbri
patent: 3925772 (1975-12-01), Miller et al.
patent: 3939359 (1976-02-01), Nehushtan et al.

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