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. 18, 1986
Filed:
Jan. 17, 1983
Klaus H Frielinghaus, Rochester, NY (US);
General Signal Corporation, Stamford, CT (US);
Abstract
A vital, or fail-safe, track circuit wheel detector for detecting the presence and position in a given detection zone of wheel-axles on railroad cars; in order to provide the requisite fail-safe indication, the operation of the system relies on a sensing means which produces two distinct output signals. The sensing means includes a biasing arrangement for providing, even in the absence of wheel-axles, a steady output signal derived from the path of normal feed current flow. This bias signal is countered or opposed by a wheel sensing signal from the same sensing means responsive to flux level changes resulting from the presence of particular directional components of wheel-axle shunt current, whereby a dip or net reduced signal is effectuated; in the case of open circuit conditions, the output indication goes to zero when there are no wheel-axles in the detection zone.