US3575390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetion
Assignee: Carter Automotive Co Inc
•
Filing: 1968-05-24
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Granted: 1971-04-20
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Expires: 1988-05-24
Abstract
Abstract A carburetor having a constant level fuel supply and a mixing conduit has a throttle valve mounted above the fuel level. Two fuel supply circuits are provided. A first fuel circuit discharges through a nozzle located adjacent the high edge of the throttle valve and a second fuel circuit discharges fuel at a point located above the low edge of the throttle valve. The high and low edges referring to the position of the throttle when in curb idle position.
Inventors
- 👤 James T Bickhaus
- 👤 Harold A Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:59
CPC Classifications
F; F02; F02M; F02M19/00; F02M19/02; F02M19/0225; F02M3/00; F02M3/08; F02M3/12; F02M7/00; F02M7/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
A downdraft carburetor comprising a bore including a mixing chamber, a constant level fuel supply, and a butterfly-type throttle valve the improvement characterized in that; a. The throttle valve is positioned near the level of fuel in the said constant level fuel supply thereby leaving an elongated mixing zone below the throttle valve, b. the said throttle valve having a high side and a low side. c. a first fuel circuit for supplying fuel adjacent the high side of the throttle valve, d. a second fuel circuit for supplying fuel in the vicinity of the low side of said throttle valve, and 3. at least one air bleed for the said first fuel circuit and further including fuel enrichment means in said air bleed, said fuel enrichment means comprising a tapered metering element and being connected by bellcrank and connecting rod means to said throttle for movement therewith.
Claim 2
Dependent Claim
148 words
A downdraft carburetor comprising a bore including a mixing chamber, a constant level fuel supply, and a butterfly-type throttle valve the improvement characterized in that; a. The throttle valve is positioned near the level of fuel in the said constant level fuel supply thereby leaving an elongated mixing zone below the throttle valve, b. the said throttle valve having a high side and a low side. c. a first fuel circuit for supplying fuel adjacent the high side of the throttle valve, d. a second fuel circuit for supplying fuel in the vicinity of the low side of said throttle valve, and 3. at least one air bleed for the said first fuel circuit and further including fuel enrichment means in said air bleed, said fuel enrichment means comprising a tapered metering element and being connected by bellcrank and connecting rod means to said throttle for movement therewith.
Claim 3
Dependent Claim
17 words
The carburetor of claim 1 including a restricted zone comprising a venturi located below the said throttle.
Claim 4
Dependent Claim
45 words
at least one air bleed for the said first fuel circuit and further including fuel enrichment means in said air bleed, said fuel enrichment means comprising a tapered metering element and being connected by bellcrank and connecting rod means to said throttle for movement therewith.
Claim 5
Dependent Claim
45 words
at least one air bleed for the said first fuel circuit and further including fuel enrichment means in said air bleed, said fuel enrichment means comprising a tapered metering element and being connected by bellcrank and connecting rod means to said throttle for movement therewith.
Claim 6
Dependent Claim
47 words
The carburetor of claim 1 including a nozzle for the said first fuel circuit, the said nozzle projecting a short distance into the said mixing chamber for a progressive coaction with the said high side of the said throttle whereby fuel delivery increases as said throttle opens.
Claim 7
Dependent Claim
22 words
The carburetor of claim 3 including a slot in the said high side of said throttle, said slot partially surrounding said nozzle.
Claim 8
Dependent Claim
53 words
The carburetor of claim 1 including upper and lower fuel discharge tubes for said second fuel circuit, the said upper tube positioned above the low side of said throttle and the said lower tube positioned below the said throttle and both of said tubes discharging fuel away from the wall of said bore.
Claim 9
Dependent Claim
15 words
The carburetor of claim 5 including idle fuel adjustment means cooperable with said lower tube.
Claim 10
Dependent Claim
39 words
The carburetor of claim 1 in which the said first and second fuel circuits are branch passages from a main fuel supply well and the said well is provided with an entrance having a throttle position controlled metering rod.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |