US3752141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum controlled carburetor throttle valve positioner
Assignee: Ford Motor Co
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Filing: 1972-08-07
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Granted: 1973-08-14
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Expires: 1992-08-07
Abstract
Abstract A downdraft type carburetor in one embodiment has an idle system discharge port that is straddled by the normal idle speed and closed throttle positions of the throttle valve so as to permit idle speed fuel and air flow in one position and no flow in the other position; a second embodiment has a conventional idle system including a transfer port cooperating with the edge of the throttle valve to provide normal idle speed fuel and air flow while reducing the idle system fuel flow in the closed position of the throttle valve; both embodiments have a third beyond normal idle, or fast idle speed position provided for engine startup; the three positions are controlled by a servo operatively engaging the throttle valve; the servo operation is controlled by intake manifold vacuum to initially close the throttle valve upon engine shut off, with a subsequent return of the throttle valve to its fast idle position for engine restarting, or to return the throttle valve to a normal idle position upon release of the vehicle accelerator pedal during engine operation.
Inventors
- 👤 H Marcum
- 👤 W Charron
- 👤 R Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:05
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/06; F02M3/062; Y; Y10; Y10S; Y10S123/00; Y10S123/11; Y10S261/00; Y10S261/19
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
320 words
A carburetor throttle valve positioner comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, and control means to move the throttle valve to and between its positions, the control means comprising power means having a first plunger operatively adapted to engage or be engaged by the throttle valve for moving the same or restricting the movement thereof, respectively, spring means acting on and biasing the first plunger to a first position urging the throttle valve to an open beyond engine normal idle speed position conditioning the engine for a hot start leaner fuel/air ratio, first engine intake manifold vacuum responsive servo means operatively acting on the first plunger in opposition to the spring means whereby the first plunger is retracted to an engine anti-dieseling second position permitting rotation of the throttle valve to a throttle valve closed position reducing flow of fuel to the engine to a level not sustaining combustion, and second plunger means movable in the path of movement in a throttle valve closing direction of the first plunger to alternately prevent movement of the first plunger beyond a third position permitting rotation of the throttle valve to a curb idle normal engine idle speed position providing a richer fuel/air ratio, or permit movement of the first plunger to the anti-dieseling second position, and second intake manifold vacuum responsive means for controlling movement of the second plunger to its various positions.
Claim 2
Dependent Claim
320 words
A carburetor throttle valve positioner comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, and control means to move the throttle valve to and between its positions, the control means comprising power means having a first plunger operatively adapted to engage or be engaged by the throttle valve for moving the same or restricting the movement thereof, respectively, spring means acting on and biasing the first plunger to a first position urging the throttle valve to an open beyond engine normal idle speed position conditioning the engine for a hot start leaner fuel/air ratio, first engine intake manifold vacuum responsive servo means operatively acting on the first plunger in opposition to the spring means whereby the first plunger is retracted to an engine anti-dieseling second position permitting rotation of the throttle valve to a throttle valve closed position reducing flow of fuel to the engine to a level not sustaining combustion, and second plunger means movable in the path of movement in a throttle valve closing direction of the first plunger to alternately prevent movement of the first plunger beyond a third position permitting rotation of the throttle valve to a curb idle normal engine idle speed position providing a richer fuel/air ratio, or permit movement of the first plunger to the anti-dieseling second position, and second intake manifold vacuum responsive means for controlling movement of the second plunger to its various positions.
Claim 3
Dependent Claim
33 words
A throttle valve positioner as in claim 1, the second plunger being floatingly mounted for free movement in either direction so as at times to be withdrawn from engagement with the first plunger.
Claim 4
Dependent Claim
269 words
A carburetor throttle valve positioner comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, and control means to move the throttle valve to and between its positions, the throttle valve having linkage means secured thereto, the control means including first and second vacuum servos in back-to-back relationship with axially aligned actuators adapted to contact and move or restrict movement of each other at times, the first actuator being freely movable and the second actuator being spring biased towards the throttle valve linkage means, conduit means connecting engine intake manifold vacuum to the first vacuum servo for moving the first plunger toward the second plunger, flow restriction means connecting said servos for communicating vacuum to the second servo while delaying changes in pressure level between the servos, the vacuum in the second servo urging the second plunger toward the first, said second servo having a vacuum reservoir for temporarily maintaining a vacuum in the second servo regardless of a decay in vacuum in the first servo to permit the second plunger to move the first plunger to a throttle valve closed throttle position.
Claim 5
Dependent Claim
269 words
A carburetor throttle valve positioner comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, and control means to move the throttle valve to and between its positions, the throttle valve having linkage means secured thereto, the control means including first and second vacuum servos in back-to-back relationship with axially aligned actuators adapted to contact and move or restrict movement of each other at times, the first actuator being freely movable and the second actuator being spring biased towards the throttle valve linkage means, conduit means connecting engine intake manifold vacuum to the first vacuum servo for moving the first plunger toward the second plunger, flow restriction means connecting said servos for communicating vacuum to the second servo while delaying changes in pressure level between the servos, the vacuum in the second servo urging the second plunger toward the first, said second servo having a vacuum reservoir for temporarily maintaining a vacuum in the second servo regardless of a decay in vacuum in the first servo to permit the second plunger to move the first plunger to a throttle valve closed throttle position.
Claim 6
Dependent Claim
268 words
A carburetor throtTle valve positioner comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, and control means to move the throttle valve to and between its positions, the control means including a servo, the servo having a hollow shell with a partition dividing the shell into two chambers each of which is subdivided into an air and vacuum chamber by an annular flexible diaphragm, means connecting the first plunger to a first diaphragm and the second plunger to the second diaphragm, the plungers being axially aligned with the second plunger projecting slidably and sealingly through the partition for engagement at times with the first plunger, the vacuum chambers being adjacent one another while the air chambers are remote with respect to each other, means connecting the conduit means to the second diaphragm vacuum chamber and a vacuum storage reservoir to the first diaphragm vacuum chamber, and flow restriction means in the partition between the vacuum chambers for permitting a restricted communication therebetween and an equalization of pressures therein at times while at other times effecting a temporary unequalization of pressures therebetween.
Claim 7
Dependent Claim
268 words
A carburetor throtTle valve positioner comprising, in combination, an engine carburetor having an induction passage open to atmospheric pressure at one end and adapted to be connected to an engine intake manifold at the opposite end so as to be subject to engine vacuum varying in level from ambient atmospheric pressure at engine shutdown to a maximum subatmospheric pressure level during engine deceleration operating conditions, a throttle valve rotatably mounted across the passage and movable from a closed position to an engine idle speed position and beyond to a wide open throttle position, and return, for controlling flow through the passage, and control means to move the throttle valve to and between its positions, the control means including a servo, the servo having a hollow shell with a partition dividing the shell into two chambers each of which is subdivided into an air and vacuum chamber by an annular flexible diaphragm, means connecting the first plunger to a first diaphragm and the second plunger to the second diaphragm, the plungers being axially aligned with the second plunger projecting slidably and sealingly through the partition for engagement at times with the first plunger, the vacuum chambers being adjacent one another while the air chambers are remote with respect to each other, means connecting the conduit means to the second diaphragm vacuum chamber and a vacuum storage reservoir to the first diaphragm vacuum chamber, and flow restriction means in the partition between the vacuum chambers for permitting a restricted communication therebetween and an equalization of pressures therein at times while at other times effecting a temporary unequalization of pressures therebetween.
Claim 8
Dependent Claim
34 words
A positioner as in claim 3, the first and second servos each having a flexible diaphragm secured respectively to the first and second plungers and dividing each servo into a vacuum and air chamber.
Claim 9
Dependent Claim
30 words
A positioner as in claim 3, the flow restriction means being temperature responsive to vary in area and thereby vary the time delay for equalization of pressures between the servos.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |