Infrared signalling system for detecting a predetermined state o

Details Infrared signalling system for detecting a predetermined state o Infrared signalling system for detecting a predetermined state o

1987-04-24

1989-02-21

Caldwell, Sr., John W.

Communications: electrical

Visual indication

Movable

340556, 340644, 34087028, 356375, G08B 514

Patent

active

048069256

ABSTRACT:
A semaphore for use in a detection system for a high voltage device and for signalling a predetermined state of the device. The semaphore comprises a housing supporting therein a retroreflector element. The housing has an aperture and the retroreflector has a reflective surface supported in a alignment with the aperture. The housing is mounted in close proximity to the device. A linkage is associated with the housing and the device and is actuated upon the occurrence of a predetermined condition whereby to expose the reflective surface in the housing for the reflection of signals through the apertures. A remote scanning device continuously generates infrared signals in the direction of the aperture and detects reflective signals from the reflective surface.

REFERENCES:
patent: 3659949 (1972-05-01), Walsh
patent: 3852556 (1974-12-01), Kane et al.
patent: 4236149 (1980-11-01), Soyck
patent: 4250498 (1981-02-01), Walter
patent: 4451910 (1984-05-01), Simard
patent: 4546246 (1985-10-01), Bechtel

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