Transit system third rail warning signal

Details Transit system third rail warning signal Transit system third rail warning signal

1986-05-02

1988-04-05

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340660, 340 47, 324133, 191 29R, G08B 2100

Patent

active

047361972

ABSTRACT:
Apparatus for indicating the presence of power on the third rail of a transit system having two running rails and a third rail includes a first connector for connecting to the third rail and a second connector for connecting to one of the running rails and a circuit for indicating the presence of a voltage between the first connector and the second connector and thereby indicating a voltage between the one running rail and the third rail, the means for indicating including visual and audible signaling apparatus. In some forms of the invention the apparatus may include an annunciator and a strobe light. Other forms of the invention include third and fourth connectors which are magnetically held to the rails.

REFERENCES:
patent: 1595154 (1926-08-01), Harrison
patent: 3531790 (1970-09-01), Staley
patent: 3962630 (1976-06-01), Chaffee
patent: 4233560 (1980-11-01), Blenman
patent: 4283657 (1981-08-01), Gordon et al.
patent: 4489308 (1984-12-01), Logan, Jr. et al.

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