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US3899552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor with automatic air-fuel ratio adjustment control
Assignee: Universal Oil Products Co
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Filing: 1974-03-01
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Granted: 1975-08-12
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Expires: 1994-03-01
Abstract
Abstract Improved carburetor of the constant depression type incorporates an automatically adjustable seat for the main jet fuel valve. The seat is reciprocated by a rod which is actuated externally of the carburetor housing by a cam. The cam is actuated by a servo motor in response to intermittent electrical signals produced by a closed loop control system when the oxygen content of the exhaust gases varies from stoichiometry or from any other desired value. A bellows assembly seals the rod relative to the housing and also biases the rod into contact with the cam.
Inventors
- 👤 Carl F Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:25
CPC Classifications
F; F02; F02D; F02D35/00; F02D35/0015; F02D35/0046; F02D35/0053; F02D35/0076; F02M; F02M7/00; F02M7/12; F02M7/14; F02M7/16; F02M7/17; Y; Y10; Y10S; Y10S261/00; Y10S261/74
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
206 words
APPARATUS FOR CONTINUOUSLY ADJUSTING THE AIR-FUEL RATIO OF A CARBURETOR OF THE TYPE HAVING A FUEL BOWL, A TUBULAR MAIN FUEL JET VALVE SEAT MOUNTED IN THE FUEL BOWL AND A TAPERED MAIN FUEL JET NEEDLE VALVE MOUNTED TO MOVE WITHIN SAID TUBULAR MAIN JET VALVE SEAT AND AXIALLY RELATIVE THERETO TO VARY THE FLOW OF FUEL FROM SAID JET, SAID APPARATUS COMPRISING MEANS FOR MOUNTING SAID TUBULAR MAIN FUEL JET VALVE, SEAT FOR RAPID RECIPROCATORY MOVEMENT ALONG ITS AXIS, SAID MOUNTING MEANS INCLUDING RESILIENT MEANS COMPRISING A CORRUGATED BELLOWS MEMBER FOR BIASING SAID TUBULAR MAIN JET VALVE SEAT IN ONE DIRECTION RELATIVE TO THE TAPERED MAIN JET NEEDLE, SAID MOUNTING MEANS FURTHER INCLUDING A CONTACT PORTION POSITIONED EXTERNALLY OF SAID FUEL BOWL AND ADAPTED WHEN CONTACTED TO MOVE SAID TUBULAR MAIN JET VALVE SEAT IN AN OPPOSITE DIRECTION AND AGAINST THE BIAS OF SAID RESILIENT MEANS, AND MEANS PERIODICALLY OPERATIVE IN RESPONSE TO AN ELECTRICAL SIGNAL INDICATIVE OF A DESIRED CHANGE IN THE AIR-FUEL RATIO OF THE CARBURETOR TO CONTACT SAID CONTACT PORTION AND EITHER DRIVE SAID TUBULAR MAIN JET A PREDETERMINED DISTANCE IN SAID OPPOSITE DIRECTION OR PERMIT SAID RESILIENT MEANS TO MOVE SAID TUBULAR MAIN JET A PREDETERMINED DISTANCE IN SAID ONE DIRECTION.
Claim 2
Dependent Claim
206 words
APPARATUS FOR CONTINUOUSLY ADJUSTING THE AIR-FUEL RATIO OF A CARBURETOR OF THE TYPE HAVING A FUEL BOWL, A TUBULAR MAIN FUEL JET VALVE SEAT MOUNTED IN THE FUEL BOWL AND A TAPERED MAIN FUEL JET NEEDLE VALVE MOUNTED TO MOVE WITHIN SAID TUBULAR MAIN JET VALVE SEAT AND AXIALLY RELATIVE THERETO TO VARY THE FLOW OF FUEL FROM SAID JET, SAID APPARATUS COMPRISING MEANS FOR MOUNTING SAID TUBULAR MAIN FUEL JET VALVE, SEAT FOR RAPID RECIPROCATORY MOVEMENT ALONG ITS AXIS, SAID MOUNTING MEANS INCLUDING RESILIENT MEANS COMPRISING A CORRUGATED BELLOWS MEMBER FOR BIASING SAID TUBULAR MAIN JET VALVE SEAT IN ONE DIRECTION RELATIVE TO THE TAPERED MAIN JET NEEDLE, SAID MOUNTING MEANS FURTHER INCLUDING A CONTACT PORTION POSITIONED EXTERNALLY OF SAID FUEL BOWL AND ADAPTED WHEN CONTACTED TO MOVE SAID TUBULAR MAIN JET VALVE SEAT IN AN OPPOSITE DIRECTION AND AGAINST THE BIAS OF SAID RESILIENT MEANS, AND MEANS PERIODICALLY OPERATIVE IN RESPONSE TO AN ELECTRICAL SIGNAL INDICATIVE OF A DESIRED CHANGE IN THE AIR-FUEL RATIO OF THE CARBURETOR TO CONTACT SAID CONTACT PORTION AND EITHER DRIVE SAID TUBULAR MAIN JET A PREDETERMINED DISTANCE IN SAID OPPOSITE DIRECTION OR PERMIT SAID RESILIENT MEANS TO MOVE SAID TUBULAR MAIN JET A PREDETERMINED DISTANCE IN SAID ONE DIRECTION.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said periodically operative means comprises a movable cam surface.
Claim 4
Dependent Claim
16 words
The apparatus of claim 2 wherein said movable cam surface is driven by a stepping motor.
Claim 5
Dependent Claim
16 words
The apparatus of claim 2 wherein said cam surface is eccentrically positioned about a movable shaft.
Claim 6
Dependent Claim
41 words
The apparatus of claim 1 wherein said contact portion is on the end of a rod which passes through the bellows member and is firmly affixed to the bellows member for movement therewith and to the tubular main jet valve seat.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |