Carburetor cold enrichment device

Claim 2

An air/fuel mixture enrichment device for use with a carburetor having an induction passage open to air essentially at atmospheric pressure at one end and adapted to be connected to an internal combustion engine intake manifold at the opposite end, a throttle valve mounted for a rotative movement across the passage between closed and fully open positions to control flow through the passage, and a fuel reservoir, the device including control means to supply an air/fuel mixture to the carburetor during cold weather engine cranking and running operations that is supplemental to the carburetor normal air/fuel mixture supply, the control means comprising; first conduit means connecting fuel from the reservoir and air to a port in the induction passage located at a point below the closed position of the throttle valve and subject to engine vacuum, first temperature responsive valve means variably movable from a first position closing the conduit means when the temperature is at a predetermined level to subsequent positions progressively opening wider the conduit means when the temperature progressively decreases below the predetermined level, and vacuum servo means responsive to the engine vacuum attaining an engine running level and acting thereon for moving the valve means at times in a closing direction to decrease the supplemental fuel and airflow, seCond temperature responsive means operably connected to the servo means for controlling the movement of the servo means as a function of temperature changes, the second temperature responsive means being responsive to ambient temperature changes from a predetermined level.

Claim 3

An enrichment device as in claim 1, wherein the valve means includes means responsive to changes in engine operating temperatures from a predetermined level for moving the valve means.

Claim 4

An air/fuel mixture enrichment device for use with a carburetor having an induction passage open to air essentially at atmospheric pressure at one end and adapted to be connected to an internal combustion engine intake manifold at the opposite end, a throttle valve mounted for a rotative movement across the passage between closed and fully open positions to control flow through the passage, and a fuel reservoir, the device including control means to supply an air/fuel mixture to the carburetor during cold weather engine cranking and running operations that is supplemental to the carburetor normal air/fuel mixture supply, the control means comprising; first conduit means connecting fuel from the reservoir and air to a port in the induction passage located at a point below the closed position of the throttle valve and subject to engine vacuum, first temperature responsive valve means variably movable from a first position closing the conduit means when the temperature is at a predetermined level to subsequent positions progressively opening wider the conduit means when the temperature progressively decreases below the predetermined level, and vacuum servo means responsive to the engine vacuum attaining an engine running level and acting thereon for moving the valve means at times in a closing direction to decrease the supplemental fuel and airflow, the temperature responsive valve means including means responsive to changes in engine operating temperature levels from a predetermined level for moving the valve means, the last mentioned means comprising a bimetallic coil spring, the valve means comprising a spool valve having first and second spaced lands interconnected by a neck portion of reduced diameter, means connecting one end of the coil spring to the spool valve, second conduit means supplying engine exhaust manifold heated air to the first conduit means past the coil spring and spool valve lands, the first land blocking the flow of the heated air during engine vacuums lower than engine running levels and unblocking the flow upon movement of the valve in one direction, the movement of the valve in the one direction from the first land closed position moving the neck portion to restrict fuel flow from the reservoir, the second land variably controlling the flow of the heated air and fuel as well as additional airflow to the first conduit means, movement of the second land to one position completely blocking all flow to the first conduit means.

Claim 5

An air/fuel mixture enrichment device for use with a carburetor having an induction passage open to air essentially at atmospheric pressure at one end and adapted to be connected to an internal combustion engine intake manifold at the opposite end, a throttle valve mounted for a rotative movement across the passage between closed and fully open positions to control flow through the passage, and a fuel reservoir, the device including control means to supply an air/fuel mixture to the carburetor during cold weather engine cranking and running operations that is supplemental to the carburetor normal air/fuel mixture supply, the control means comprising; first conduit means connecting fuel from the reservoir and air to a port in the induction passage located at a point below the closed position of the throttle valve and subject to engine vacuum, first temperature responsive valve means variably movable from a first position closing the conduit means when the temperature is at a predetermined level to subsequent positions progressively opening wider the conduit means when the temperature progressively decreases below the predetermined level, and vacuum servo means responsive to the engine vacuum attaining an engine running level and acting thereon for moving the valve means at times in a closing direction to decrease the supplemental fuel and airflow, the temperature responsive valve means including means responsive to changes in engine operating temperature levels from a predetermined level for moving the valve means, the last mentioned means comprising a bimetallic coil spring, the valve means comprising a spool valve having first and second spaced lands interconnected by a neck portion of reduced diameter, means connecting one end of the coil spring to the spool valve, second conduit means supplying engine exhaust manifold heated air to the first conduit means past the coil spring and spool valve lands, the first land blocking the flow of the heated air during engine vacuums lower than engine running levels and unblocking the flow upon movement of the valve in one direction, the movement of the valve in the one direction from the first land closed position moving the neck portion to restrict fuel flow from the reservoir, the second land variably controlling the flow of the heated air and fuel as well as additional airflow to the first conduit means, movement of the second land to one position completely blocking all flow to the first conduit means.

Claim 6

An enrichment device as in claim 3, wherein the servo means and spool valve are interconnected by a lost motion connection permitting a limited independent operation of each of the servo means and spool valve.

Claim 7

An air/fuel mixture enrichment device for use with a carburetor having an induction passage open to air essentially at atmospheric pressure at one end and adapted to be connected to an internal combustion engine intake manifold at the opposite end, a throttle valve mounted for a rotative movement across the passage between closed and fully open positions to control flow through the passage, and a fuel reservoir, the device including control means to supply an air/fuel mixture to the carburetor during cold weather engine cranking and running operations that is supplemental to the carburetor normal air/fuel mixture supply, the control means comprising; first conduit means connecting fuel from the reservoir and air to a port in the induction passage located at a point below the closed position of the throttlE valve and subject to engine vacuum, first temperature responsive valve means variably movable from a first position closing the conduit means when the temperature is at a predetermined level to subsequent positions progressively opening wider the conduit means when the temperature progressively decreases below the predetermined level, and vacuum servo means responsive to the engine vacuum attaining an engine running level and acting thereon for moving the valve means at times in a closing direction to decrease the supplemental fuel and airflow, second temperature responsive means operably connected to the servo means for controlling the movement of the servo means as a function of temperature changes, the second temperature responsive means comprises a bimetallic spring coil responsive to changes in ambient temperature conditions from a predetermined level, and further means connected to the coil for movement therewith variably into the path of movement of the servo means to variably restrict the movement of the servo means and valve means as a function of the temperature.

Claim 8

An air/fuel mixture enrichment device for use with a carburetor having an induction passage open to air essentially at atmospheric pressure at one end and adapted to be connected to an internal combustion engine intake manifold at the opposite end, a throttle valve mounted for a rotative movement across the passage between closed and fully open positions to control flow through the passage, and a fuel reservoir, the device including control means to supply an air/fuel mixture to the carburetor during cold weather engine cranking and running operations that is supplemental to the carburetor normal air/fuel mixture supply, the control means comprising; first conduit means connecting fuel from the reservoir and air to a port in the induction passage located at a point below the closed position of the throttlE valve and subject to engine vacuum, first temperature responsive valve means variably movable from a first position closing the conduit means when the temperature is at a predetermined level to subsequent positions progressively opening wider the conduit means when the temperature progressively decreases below the predetermined level, and vacuum servo means responsive to the engine vacuum attaining an engine running level and acting thereon for moving the valve means at times in a closing direction to decrease the supplemental fuel and airflow, second temperature responsive means operably connected to the servo means for controlling the movement of the servo means as a function of temperature changes, the second temperature responsive means comprises a bimetallic spring coil responsive to changes in ambient temperature conditions from a predetermined level, and further means connected to the coil for movement therewith variably into the path of movement of the servo means to variably restrict the movement of the servo means and valve means as a function of the temperature.

Claim 9

An enrichment device as in claim 5, wherein the further means comprises a member having a stepped face, the servo means having a plunger connected to the valve means by a lost motion connection and projecting towards the steps of the stepped face for individual engagement therewith, spring means biasing the plunger towards the valve means, the steps being of progressively greater axial depth relative to the axis of the plunger, the movement of the coil in response to temperature changes progressively presenting the steps for engagement by the plunger to vary and limit its movement and thereby vary the position of the valve means.