High voltage protector

Details High voltage protector High voltage protector

1985-10-28

1987-12-15

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340660, 246129, 324133, G08B 2100

Patent

active

047136537

ABSTRACT:
Apparatus for warning workers on electrified railroad tracks that the third rail is live having visual and/or aural alarms, sensing electrodes or contactors for deriving power for activating alarms from the third rail, and circuits for providing visual and/or aural alarms indicating that the contactors have not made proper contact with the rails to assure the workers that the warning apparatus is properly operating as a high voltage protector.

REFERENCES:
patent: 3404340 (1968-10-01), LaBrie
patent: 3531790 (1970-09-01), Staley
patent: 3810258 (1974-05-01), Mathauser
patent: 3831089 (1974-08-01), Pearce
patent: 3870952 (1975-03-01), Sibley
patent: 3962630 (1976-06-01), Chaffee
patent: 3967257 (1976-06-01), Hager
patent: 4225817 (1980-09-01), Kahlden
patent: 4233560 (1980-11-01), Blenman
patent: 4356442 (1982-10-01), Beha
patent: 4366434 (1982-12-01), Ellis
patent: 4506260 (1985-03-01), Woodruff et al.

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