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:
Aug. 06, 1991
Filed:
Dec. 27, 1988
Applicant:
Inventor:
William M Glasheen, Derry, NH (US);
Assignee:
AmeSpace, Inc., Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01P / ; G01D / ;
U.S. Cl.
CPC ...
324175 ; 32420725 ; 324226 ; 250225 ;
Abstract
A Speed Sensor for a rotating member utilizes a magneto optic switch and a magnet mounted in the vicinity of the rotating member. Under normal conditions the magnetic field is at right angles to the axis of sensitivity of the switch thereby blocking light transmission through the switch. When a ferrous tooth on the rotating member passes the sensor, the magnetic field is distorted due to the change in reluctance caused by passage of the tooth thereby generating a magnetic field component along the switch axis of sensitivity turning the switch on and producing an output speed signal.