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:
Dec. 17, 2002
Filed:
Feb. 06, 2002
Raymond C. Franke, Glenshaw, PA (US);
Union Switch & Signal, Inc., Pittsburgh, PA (US);
Abstract
A solid state code following track relay receives pulsating rail current from a railway code transmitter. The track relay includes first and second inputs structured to receive the rail current. Two Hall effect digital current sensors each have a coil and an output, which responds to current flowing through the coil. The coils of the current sensors are electrically connected in series between the first and second inputs and are structured to receive the rail current. The outputs of the current sensors are structured to turn on and off in response to the rail current. A circuit including dual one-shot multivibrators, which are triggered by positive and negative going edges from the respective current sensors, and a flip-flop, which is set and reset by the outputs of the respective multivibrators, determines that each of the current sensors is functional. Two solid state outputs are structured to follow the rail current.