Spark timing control

Claim 2

A spark timing control for an internal combustion engine having an intake manifold defining a source of suction comprising a suction operated motor connected to a spark timing mechanism, first conduit means for connecting said motor to the source and to atmosphere for operating the motor to produce an advance of the timing of the spark, second conduit means for connection said motor to the source and to atmosphere for operating the motor to produce a retard of the timing of the spark, and means responsive to a predetermined speed of engine for selectively connecting the source to said first or second conduit means, the motor comprising a movable wall defining an expansible chamber on each side thereof, and said first conduit means is connected to one chamber and the second conduit means is connected to the other chamber, said responsive means including a housing having a pair of bleed openings connected to atmosphere and a valve therein shiftably mounted between a pair of positions and said conduit means comprises a conduit connecting said housing to said source and separate conduits connecting the housing to each of said chambers whereby movement of the valve to one position will connect the source of suction to one of said chambers while closing the source of suction to the other chamber and allow said other chamber to bleed to atmosphere.

Claim 3

A spark timing control for an internal combustion engine having an intake manifold defining a source of suction comprising a suction operated motor connected to a spark timing mechanism, first conduit means for connecting said motor to the source and to atmosphere for operating the motor to produce an advance of the timing of the spark, second conduit means for connecting said motor to the source and to atmosphere for operating the motor to produce a retard of the timing of the spark, and means responsive to a predetermined speed of engine for selectively connecting thE source to said first or second conduit means, the motor comprising a movable wall defining an expansible chamber on each side thereof, and said first conduit means is connected to one chamber and the second conduit means is connected to the other chamber, said responsive means including a housing having a valve therein shiftably mounted between two positions, and said conduit means comprises a conduit connecting said housing to said source and separate conduits connecting the housing to each of said chambers, whereby movement of said valve to one position will connect the source of suction to one of said chambers while closing the source of suction to the other chamber and bleeding said other chamber to atmosphere, the other position will connect the source of vacuum to said other chamber and means bleeding said one chamber.

Claim 4

A spark timing control for an internal combustion engine having an intake manifold defining a source of suction comprising a suction operated motor connected to a spark timing mechanism, first conduit means for connecting said motor to the source and to atmosphere for operating the motor to produce an advance of the timing of the spark, second conduit means for connecting said motor to the source and to atmosphere for operating the motor to produce a retard of the timing of the spark, and means responsive to a predetermined speed of engine for selectively connecting thE source to said first or second conduit means, the motor comprising a movable wall defining an expansible chamber on each side thereof, and said first conduit means is connected to one chamber and the second conduit means is connected to the other chamber, said responsive means including a housing having a valve therein shiftably mounted between two positions, and said conduit means comprises a conduit connecting said housing to said source and separate conduits connecting the housing to each of said chambers, whereby movement of said valve to one position will connect the source of suction to one of said chambers while closing the source of suction to the other chamber and bleeding said other chamber to atmosphere, the other position will connect the source of vacuum to said other chamber and means bleeding said one chamber.

Claim 5

A spark timing control for an internal combustion engine having an intake manifold defining a source of suction and having a throttle valve comprising, a suction operated motor connected to a spark timing mechanism, first conduit means for connecting said motor to the source for full manifold suction downstream of the idle position of the throttle valve and to atmosphere for operating the motor by suction to produce an advance of the timing of the spark, second conduit means for connecting said motor to the source for full manifold suction downstream of the idle position of the throttle valve and to atmosphere for operating the motor by suction to produce a retard of the timing of the spark and means responsive to a predetermined speed of engine for connecting the source to said first conduit means for producing an advance of the time of the spark at all positions of the throttle, including closed idle, said responsive means connecting the source to the second conduit means at a lower than said predetermined speed for producing a suction operated retard of the timing of the spark.

Claim 6

A spark timing control for an internal combustion engine having an intake manifold defining a source of suction and having a throttle valve comprising, a suction operated motor connected to a spark timing mechanism, first conduit means for connecting said motor to the source for full manifold suction downstream of the idle position of the throttle valve and to atmosphere for operating the motor by suction to produce an advance of the timing of the spark, second conduit means for connecting said motor to the source for full manifold suction downstream of the idle position of the throttle valve and to atmosphere for operating the motor by suction to produce a retard of the timing of the spark and means responsive to a predetermined speed of engine for connecting the source to said first conduit means for producing an advance of the time of the spark at all positions of the throttle, including closed idle, said responsive means connecting the source to the second conduit means at a lower than said predetermined speed for producing a suction operated retard of the timing of the spark.

Claim 7

A device as defined in claim 3 wherein the motor comprises a movable wall defining an expansible chamber on each side thereof, and said first conduit means is connected to one chamber and the second conduit means is connected to the other chamber.

Claim 8

A device as defined in claim 3 wherein the responsive means comprises valve means.

Claim 9

A device as defined in claim 4 wherein said responsive means includes a housing, a valve therein shiftably mounted between a pair of positions, a valve stem connected to the valve for shifting the valve, and bleed conduit means in said stem for selectively bleeding one of the chambers to atmosphere while the other chamber is connected to the source of vacuum as the valve is shifted to one or the other of said positions.

Claim 10

A device as defined in claim 4 wherein said responsive means includes a housing, a valve therein shiftably mounted between a pair of positions, for alternately connecting each of the chambers to the source while bleeding the other to atmosphere.