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. 05, 1977
Filed:
Jul. 19, 1976
Larry J Tipton, Florissant, MO (US);
ACF Industries, Incorporated, St. Louis, MO (US);
Abstract
An air valve for a carburetor has its lower end mounted for pivotal movement between open and closed positions relative to the air and fuel mixture conduit and carries a metering rod which extends generally in a horizontal direction. The metering rod has an end extending within a metering orifice of an orifice plate in an opening of the mixture conduit wall. The metering rod is urged by a coiled torsion spring upwardly against the orifice plate. The torsion spring has a small coil with a relatively high spring rate and a large coil with a relatively low spring rate. The large coil continuously urges the rod into engagement with the upper surface of the orifice plate defining the orifice, while the small coil urges the rod into engagement with the orifice plate only after the air valve is around one half open. The metering rod is mounted for limited pivotal movement relative to the air valve and the torsion spring exerts a generally uniform light force to the metering rod throughout the longitudinal movement of the metering rod to compensate for the varying distance between the orifice plate and pivotal mounting of the metering rod and the increased load against the rod caused by impinging air flow.