US3653366A — Control device for the air-intake of carburetor-t…

Claim 1

Independent Claim 327 words

A control device for the air intake of a carburetor-type internal combustion engine comprising in combination: a. a main intake duct; b. a cold-air intake duct opening into the main intake duct from one side; c. a warm-air intake duct opening into the main intake duct from another side so as to face the cold-air intake duct; d. a control flap with a shaft pivotably mounted between the openings of the cold-air and warm-air intake ducts, so that it can pivot between a first end position in which it closes off the opening of the cold-air intake duct and a second end position in which it closes off the warm-air intake duct; e. a thermostat and drive means with a control sleeve on said drive means, mounted inside the main intake duct and means to actuate said drive means by said thermostat to produce a control displacement of its drive means in response to the temperature of the air passing through the main duct; and f. a control linkage arranged between the control flap and the thermostat drive means so as to give the control flap a predetermined angular position in response to the intake temperature, this control linkage further including a push rod assembly pushed by the thermostat in response to the intake temperature with a pre-loaded overload spring, a control flap pivot arm on said shaft, and a control rod on the thermostat side linking the thermostat drive means to the control flap over said control flap pivot arm shaft over on said shaft, and a push-insensitive pull member pulled by said overload spring in its retracting mode and linking the control rod to a return pivot arm on the said control flap shaft, the radius of said return pivot arm being larger than the radius of said control flap pivot arm, whereby the effective leverage of the said pull member on the control flap shaft is greater than that of the push rod assembly.

Claim 2

Dependent Claim 327 words

A control device for the air intake of a carburetor-type internal combustion engine comprising in combination: a. a main intake duct; b. a cold-air intake duct opening into the main intake duct from one side; c. a warm-air intake duct opening into the main intake duct from another side so as to face the cold-air intake duct; d. a control flap with a shaft pivotably mounted between the openings of the cold-air and warm-air intake ducts, so that it can pivot between a first end position in which it closes off the opening of the cold-air intake duct and a second end position in which it closes off the warm-air intake duct; e. a thermostat and drive means with a control sleeve on said drive means, mounted inside the main intake duct and means to actuate said drive means by said thermostat to produce a control displacement of its drive means in response to the temperature of the air passing through the main duct; and f. a control linkage arranged between the control flap and the thermostat drive means so as to give the control flap a predetermined angular position in response to the intake temperature, this control linkage further including a push rod assembly pushed by the thermostat in response to the intake temperature with a pre-loaded overload spring, a control flap pivot arm on said shaft, and a control rod on the thermostat side linking the thermostat drive means to the control flap over said control flap pivot arm shaft over on said shaft, and a push-insensitive pull member pulled by said overload spring in its retracting mode and linking the control rod to a return pivot arm on the said control flap shaft, the radius of said return pivot arm being larger than the radius of said control flap pivot arm, whereby the effective leverage of the said pull member on the control flap shaft is greater than that of the push rod assembly.

Claim 3

Dependent Claim 89 words

The device as defined in claim 1, said control rod having a sliding connection between said drive means and said control sleeve wherein the connection between the thermostat drive means and the control rod is pull-insensitive, acting on the said controlflap arm in a clockwise direction only, and wherein the total possible displacement of the thermostat drive means exceeds The corresponding pivoting displacement of the control flap, overtravel in one direction being permitted by the pull-insensitive connection and overtravel in the other direction being permitted by the overload spring.

Claim 4

Dependent Claim 107 words

The device as defined in claim 1, wherein the push rod assembly includes a control sleeve with a guide bore to accomodate a variable length portion of the control rod and a shoulder to retain one end of the overload spring, the control rod having a shoulder to retain the other end of the overload spring, the latter surrounding respective portions of the control sleeve and control rod; and wherein the pull member is a rod-type rigid link, at least one of its end connections being arranged for slidable motion away from a pull position, when the push rod assembly is longitudinally compressed against the overload spring.

Claim 5

Dependent Claim 65 words

The device as defined in claim 3, wherein the pull member is connected to the control rod at a point between the thermostat and the control rod shoulder engaging the latter for retracting movement therewith, the pull member having an axial bore for slidable motion on the control rod away from said shoulder, when the push rod assembly is longitudinally compressed against the overload spring.

Claim 6

Dependent Claim 56 words

The device as defined in claim 1, wherein the main intake duct further includes a removable support frame forming the duct portion to which the thermostat is mounted and having pivot support means for the control flap shaft, so that the control flap, control linkage and thermostat can be removed from the duct as one sub-assembly.

Claim 7

Dependent Claim 40 words

The device as defined in claim 5, wherein the support frame includes opposing pivot bores to accomodate the two ends of the control flap shaft, at least one of the pivot bores being laterally open for insertion of the shaft.

Claim 8

Dependent Claim 65 words

The device as defined in claim 1, wherein the control flap shaft includes the control flap pivot arm and the return pivot arm as integral crank-shaped portions extending in the same direction therefrom, the control sleeve having a laterally open bore for its connection to the control flap pivot arm, and the pull member having an oblong hole for insertion over the return pivot arm.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-04-04	1975-10-04	1976-04-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-04-04	1979-10-04	1980-04-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-04-04	1983-10-04	1984-04-04	$7700.00	Window Closed / Lapsed

Control device for the air-intake of carburetor-type internal combustion engines

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