Acf Industries, Incorporated

William A Green

J Joseph Muller

Richard D Doerr

An improvement for a controller (C) for controlling the idle speed of an engine. A logic circuit (1) is responsive to the position of switches (S1, S2) and the direction in which an extendible and retractable member (T) is to be driven by a motor (M) to energize the motor. The logic circuit includes logic gate (3) responsive to both switches being open when the member is at its extreme extended position and the member is to be retracted to energize the motor to retract the member. The logic circuit also includes a logic gate (5) responsive to both the switches being open when the member is at its extreme retracted position and the member is to be extended to energize the motor to extend the member. The motor is thus energized to move the member in the appropriate direction even though a switch which should be closed is open due to dust or debris preventing switch closure.

Idle speed controller improvement

A carburetor improvement comprising a step-up spring (S) seat (1) attachable to a metering rod lifter (L). The step-up spring bears against the spring seat rather than against a step-up piston (P). Part throttle adjustment of the step-up piston position on the metering rod lifter does not alter the step-up spring force from that which the step-up spring is designed to exert when changes in engine vacuum occur and a throttle shaft (TS) is stationary.

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St. Charles, MO, United States of America

William A Green