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:
Sep. 05, 1989
Filed:
Feb. 26, 1988
William B Spillman, Jr, Charlotte, VT (US);
Robert E Rudd, III, Middlebury, VT (US);
Michael E Ellinger, North Ferrisburg, VT (US);
Douglas R Patriquin, Middlebury, VT (US);
Bruce R Kline, Starksboro, VT (US);
Simmonds Precision Products, Inc., Wilmington, DE (US);
Abstract
A rotating shaft torsional displacement and speed detector provides a light beam which impinges on one or both ends of the rotating shaft. Different combinations of beam altering materials such as reflecting and non-reflecting surfaces, wave retarding plates, and linear polarizers are attached to the front shaft end and rear shaft end. These beam altering materials change either the polarization or magnitude of the light beam in a predictable manner that allows for the detection of shaft speed and torsional displacement of the front shaft end with respect to the rear shaft end.