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:
Jul. 06, 1982
Filed:
Jul. 28, 1980
John A Stewart, Flint, MI (US);
Wayne C Nichols, Corunna, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A low tire pressure transducer coupled to a tire rim includes a diaphragm subject to tire pressure on one side and to a mechanical spring force on the other side. A magnet within the transducer is coupled with a shunt which minimizes the external magnetic field when tire pressure is at its proper value. However, movement of the diaphragm occasioned by low tire pressure also moves the shunt so that the external magnetic field increases substantially. Movement of the shunt also opens a valve which relieves any air pressure buildup in the transducer on the spring side of the diaphragm thereby avoiding premature actuation of the transducer due to air leakage into the transducer. A retaining ring holds the transducer to the rim and contains vents for allowing the exhaust of air from the transducer.