Door securing light barrier

Details Door securing light barrier Door securing light barrier

1976-09-30

1978-06-27

Mullins, James B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, G01D 2104

Patent

active

040977331

ABSTRACT:
A door securing light barrier with a plurality of optically active devices, between which the light barrier beam extends through at least part of the door opening and whereof one emits an electrical signal when the light barrier beam is broken, the angle of the light beam of the light beam emitting device being adjustable relative to a fixed casing.

REFERENCES:
patent: 2922992 (1960-01-01), Witcher
patent: 3360654 (1967-12-01), Muller
patent: 3488510 (1970-01-01), Raymond et al.
patent: 3500063 (1970-03-01), Reno et al.
patent: 3752978 (1973-08-01), Kahl

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