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:
Apr. 08, 1997
Filed:
Sep. 23, 1994
William E Perry, Ludington, MI (US);
Pandrol Jackson, Inc., Ludington, MI (US);
Abstract
A transducer for use in a railroad track maintenance chord reference system for measuring the vertical and horizontal position of the rails of the track. The transducer is carried by a carriage riding on the rails and provides a signal indicative of the offset between the reference chord and the rails. Each transducer includes a uncounterbalanced arm mounted to the transducer housing by a low friction carriage. The arm engages and follows a reference chord causing the arm to move as the carriage moves with respect to the chord. A linear displacement transducer is mounted within the housing to provide a signal indicative of the arm position and therefore indicative of the position of the rails.