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:
Mar. 08, 1977
Filed:
Jun. 02, 1975
Arthur L Reenstra, Hopkinton, NH (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A speed sensing mechanism for a motor vehicle skid control system has ferromagnetic portions spaced around the periphery of an exciter wheel, the exciter wheel being adapted to be mounted for movement with a motor vehicle wheel whose speed is to be monitored to move the ferromagnetic portions of the exciter wheel in a plane through a station at a rate or frequency corresponding to the speed of vehicle wheel rotation. A permanent magnet is disposed within a wire sensor coil and is mounted at the station with a first pole face in closely spaced relation to the plane of movement of the ferromagnetic portions of the exciter wheel so that the reluctance of the magnetic circuit established by the permanent magnet is varied as each of the ferromagnetic elements is moved through the station, thereby to induce an electrical signal in the coil having a frequency corresponding to vehicle wheel speed.