Transit system third rail warning signal
AssigneeGeneral Signal Corporation
InventorsWilliam P. Buyak, Arthur L. Grodsky
Life of this patent
Estimating the term…
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.
Claims21
Apparatus for indicating the presence of power on the third rail of a transit system having two running rails and a third rail, which comprises:
- first means for connecting to the third rail;
- second means for connecting to one of the running rails;
- third means for connecting to the third rail;
- fourth means for connecting to the one of the running rails;
- means for indicating the presence of a voltage between said first means for connecting and said second means for connecting and thereby indicating a voltage between the one running rail and the third rail, said means for indicating including means for providing a visual indication and means for providing an audible indication of a predetermined voltage;
- and
- said means for providing an audible indication comprises an annunciator;
- said means for providing a visual indication comprises a strobe light;
- said means for indicating a voltage also being responsive to a voltage between (1) said third means for connecting and (2) said fourth means for connecting.
Dependencies are inferred from the claim text.