Automatic choke systems for carburetors

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means

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Details

261 39R, 261 39B, F02M 110, F02M 2304, F02D 1108

Patent

active

040389553

ABSTRACT:
An automatic cold start and warmup system for an internal combustion engine carburetor comprises a coiled bimetallic spring element actuating a choke valve mounted across the induction passage of the carburetor to control air flow therethrough. Two PTC heating resistors are located in heat-transfer relation with the bimetallic element, have different switching temperatures and are connected in series with a source. A switch closes above a predetermined temperature level of the engine and short-circuits the resistor having the lower switching temperature.

REFERENCES:
patent: 3699937 (1972-10-01), De Petris
patent: 3752133 (1973-08-01), Irish
patent: 3806854 (1974-04-01), Armstrong

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