F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/54
F02M 19/10 (2006.01) F02M 9/06 (2006.01) F02M 9/10 (2006.01) F02M 19/04 (2006.01)
Patent
CA 1067360
METERING ROD CONTROL FOR AN AIR VALVE CARBURETOR Abstract of the Disclosure 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.
282258
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