The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 1981
Filed:
Jul. 12, 1978
Frank A Svet, Churchville, NY (US);
General Signal Corporation, Stamford, CT (US);
Abstract
At a railroad crossing, a single motion detection unit is selectively coupled to an occupied track in such manner that safe, effective and efficient control is obtained over the crossing alarm device. The means for coupling the motion detection unit includes means for terminating the activation of the crossing alarm device when a train stops on the approach track, but short of the actual intersection. Techniques for multiplexing a motion detection unit with plural tracks at the grade crossing or with multiple track circuits on a single track are provided. Safe operation is assured with multiple track occupancy irrespective of the sequence of occupancy and which is the last to remain occupied or if one of the trains stops or reverses direction of motion.