Patent US3753555A successfully refreshed from Google Patents.
US3753555A
Expired / Lapsed
US
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Carburetors
Assignee: Zenith Carburetter Co Ltd
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Filing: 1971-06-04
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Granted: 1973-08-21
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Expires: 1991-06-04
Abstract
Abstract A carburetor of the constant depression type in which liquid fuel is supplied through a fuel metering orifice into a throat defined in the induction passage by an air valve. The effective area of the fuel metering orifice is controlled by a profiled needle carried by the air valve. A transfer passage communicates through a port at one end with the induction passage downstream of the throttle valve when the throttle valve is closed, and, at the other end, with the fuel supply passage between the orifice and the throat through a cavity and a restricted passage. Thus some of the fuel passing through the orifice is passed into the induction passage downstream of the throttle valve when the latter is closed. Air can be drawn from upstream of the throat and mixed with the fuel in the fuel metering orifice to produce an air/fuel emulsion. Air can be fed from a point in the induction passage upstream of the throat and fed to the transfer passage, and valve means may be provided to enable adjustment of the rate of flow of such air fed to the transfer passage.
Inventors
- 👤 Lawrence G Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:18
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/08; F02M3/12; F02M7/00; F02M7/12; F02M7/14; F02M7/16; F02M7/17
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
A carburetor of the constant depression type comprising: a. a body having an induction passage which extends therethrough; b. a throttle valve connected within the induction passage; c. an air valve in the induction passage upstream of said throttle valve, said air valve defining a throat area within the induction passage, said body also having an opening into the throat area; d. a fuel supply jet, located in the opening, having a fuel metering orifice wherein fuel is fed to said orifice, said fuel supply jet also including a bore, having a larger diameter than said orifice, through which fuel flows from said orifice to said throat; e. first means for supplying air to said fuel metering orifice to form an emulsion of air and fuel in said orifice; and f. a fuel transfer passage having one end open to said bore and the other end open to said induction passage downstream of said throttle valve, whereby when said throttle valve is substantially closed part of the fuel-air mixture will be supplied to said throat and part will be supplied through said fuel transfer passage downstream of said throttle valve.
Claim 2
Dependent Claim
190 words
A carburetor of the constant depression type comprising: a. a body having an induction passage which extends therethrough; b. a throttle valve connected within the induction passage; c. an air valve in the induction passage upstream of said throttle valve, said air valve defining a throat area within the induction passage, said body also having an opening into the throat area; d. a fuel supply jet, located in the opening, having a fuel metering orifice wherein fuel is fed to said orifice, said fuel supply jet also including a bore, having a larger diameter than said orifice, through which fuel flows from said orifice to said throat; e. first means for supplying air to said fuel metering orifice to form an emulsion of air and fuel in said orifice; and f. a fuel transfer passage having one end open to said bore and the other end open to said induction passage downstream of said throttle valve, whereby when said throttle valve is substantially closed part of the fuel-air mixture will be supplied to said throat and part will be supplied through said fuel transfer passage downstream of said throttle valve.
Claim 3
Dependent Claim
38 words
The carburetor according to claim 1 further comprising second means incuding an air supply passage for supplying extra air to the fuel flowing from said fuel metering orifice and entering the induction passage downstream of said throttle valve.
Claim 4
Dependent Claim
19 words
The carburetor according to claim 2 wherein said extra air supply passage is connected to said fuel transfer passage.
Claim 5
Dependent Claim
24 words
The carburetor according to claim 2 wherein said extRa air passage includes an adjustable flow restricting unit for controlling the flow of extra air.
Claim 6
Dependent Claim
53 words
The carburetor according to claim 1 wherein said one end of said fuel transfer passage has a cavity open to said throat and a radial passage extending from said cavity and open to said bore whereby said fuel supply passage receives a fuel-air mixture from said throat and from said fuel supply jet.
Claim 7
Dependent Claim
22 words
The carburetor of claim 1 wherein said first air supply means comprises an air supply passage which slopes downward to said orifice.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |