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:
Jun. 24, 1980
Filed:
Jul. 25, 1979
Robert J Byram, Grand Blanc, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An air switch responsive to low tire pressure for emitting a pulse of air when a critical low tire pressure is achieved comprises a housing having a chamber ported to the internal tire pressure and a bellows within the chamber filled to a reference pressure. A passageway connecting the chamber to an outlet port is closed by a spring biased poppet valve. A pin on the moving end of the bellows is arranged to extend through the passageway to abut the poppet valve so that when low tire pressure causes bellows expansion, the pin will unseat the poppet valve to allow air pressure to escape from the tire through the outlet port. A second valve surrounding the stem on the bellows engages the chamber end of the passageway to close the same whenever the tire pressure reaches a second critical low pressure to stop the airflow through the outlet port.