US3886240A — Carburetor accelerator pump control apparatus

Claim 1

Independent Claim 255 words

In an internal combustion engine having a carburetor including an induction passage, a throttle valve pivotally mounted within said induction passage, an accelerator pump to inject fuel into said induction passage, linkage means interconnecting said accelerator pump and said throttle valve so that movement thereof results in actuation of the accelerator pump, a manifold vacuum responsive and temperature sensitive means having a movable element cooperable with said linkage means to limit the displacement thereof in response to throttle valve opening when the sensed temperature exceeds a predetermined magnitude, said linkage having elements including a first lever movable with said throttle valve, a second lever that actuates the accelerator pump, a resilient member and a solid link interconnecting said first and second levers, said resilient member being preloaded so as to act as a solid member until the second lever reaches the end of its travel, said manifold vacuum responsive and temperature sensitive means including a housing, said movable element having a slot formed therein extending longitudinally in the direction of movement of said movable element, said movable element being retractable so that said slot is partially received within said housing, said movable element being protracted and said one element of said linkage means being movable within the full length of said slot upon an acceleration when the temperature is below said predetermined magnitude, said movable element being retracted and said one element of said linkage means being movable within the exposed portion of said slot upon an acceleration when the temperature exceeds said predetermined magnitude.

Claim 2

Dependent Claim 255 words

In an internal combustion engine having a carburetor including an induction passage, a throttle valve pivotally mounted within said induction passage, an accelerator pump to inject fuel into said induction passage, linkage means interconnecting said accelerator pump and said throttle valve so that movement thereof results in actuation of the accelerator pump, a manifold vacuum responsive and temperature sensitive means having a movable element cooperable with said linkage means to limit the displacement thereof in response to throttle valve opening when the sensed temperature exceeds a predetermined magnitude, said linkage having elements including a first lever movable with said throttle valve, a second lever that actuates the accelerator pump, a resilient member and a solid link interconnecting said first and second levers, said resilient member being preloaded so as to act as a solid member until the second lever reaches the end of its travel, said manifold vacuum responsive and temperature sensitive means including a housing, said movable element having a slot formed therein extending longitudinally in the direction of movement of said movable element, said movable element being retractable so that said slot is partially received within said housing, said movable element being protracted and said one element of said linkage means being movable within the full length of said slot upon an acceleration when the temperature is below said predetermined magnitude, said movable element being retracted and said one element of said linkage means being movable within the exposed portion of said slot upon an acceleration when the temperature exceeds said predetermined magnitude.

Claim 3

Dependent Claim 119 words

In an internal combustion engine, apparatus according to claim 1, said manifold vacuum responsive and temperature sensitive means including a vacuum motor, said vacuum motor including a housing defining an enclosure, a flexible diaphragm dividing said enclosure into first and second chambers, said movable element connected to said flexible diaphragm and movable therewith in response to changes in pressure differentials between said chambers, passage meanS connecting one of said chambers to a source of intake manifold vacuum, vent means communicating the other of said chambers to the atmosphere, a bimetal element opening said passage when the temperature within the enclosure exceeds said predetermined magnitude and closing said passage when the temperature within the enclosure is below said predetermined magnitude.

Claim 4

Dependent Claim 91 words

In an internal combustion engine, apparatus according to claim 1, said manifold vacuum responsive and temperature sensitive means including a motion delay means, said manifold vacuum responsive and temperature sensitive means positioning said movable element so as to permit the displacement of said linkage means in direct response to throttle valve movement during the first portion of throttle valve opening when the temperature exceeds said predetermined magnitude and to permit the displacement of said linkage means in delayed response to throttle valve movement following the latter portion of throttle valve opening.

Claim 5

Dependent Claim 46 words

In an internal combustion engine, apparatus according to claim 2, said manifold vacuum responsive and temperature sensitive means including a pressure decay means, said pressure decay means comprising a restriction within said passage means preventing immediate pressure equalization between the intake manifold and said one chamber.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-05-26	1978-11-25	1979-05-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-05-26	1982-11-25	1983-05-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-05-26	1986-11-25	1987-05-27	$7700.00	Window Closed / Lapsed

Carburetor accelerator pump control apparatus

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