Fiber optic escalator handrail intrusion detector shield

Details Fiber optic escalator handrail intrusion detector shield Fiber optic escalator handrail intrusion detector shield

1992-09-08

1993-09-14

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

198323, 340555, G08B 1300, B65G 1500

Patent

active

052453154

ABSTRACT:
An optical fiber (28) disposed at the entry edge (32) of an escalator handrail guard (22) receives light from an LED (38), the magnitude of which is sensed by a detector (40), the output of which is compared (48) to determine whether its magnitude is sufficient to indicate the lack of intrusion of objects into the guard (22); if not a relay (56, 58) will drop power to the motor (62).

REFERENCES:
patent: 2846045 (1958-08-01), Fowler
patent: 2848093 (1958-08-01), Van Etten
patent: 3934699 (1976-01-01), Saito et al.
patent: 4249074 (1981-02-01), Zettler et al.
patent: 4379289 (1983-04-01), Peek
patent: 4546345 (1985-10-01), Naito
patent: 4619355 (1986-10-01), Adrian et al.
patent: 4924995 (1990-05-01), Adrian et al.
patent: 4976345 (1990-12-01), Adrian et al.
patent: 5001459 (1991-03-01), Jacoby et al.

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