US3677241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburettors operating under a constant reduced pressure
Assignee: LES USINES LAPRADE
•
Filing: 1971-05-07
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Granted: 1972-07-18
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Expires: 1991-05-07
Abstract
Abstract A carburettor operating under a constant reduced pressure comprising a mixing chamber formed in the intake manifold between the main and an auxiliary throttle valve, and fed with air and fuel by an emulsifying chamber, the input of air in which as required for idling and reduced load conditions, is controlled by a valve controlled in its turn by a vacuum chamber which is selectively connected with the atmosphere and with the intake manifold so as to make said valve close the corresponding input whenever the rotary speed of the engine is above a predetermined value and the main throttle valve is simultaneously closed or substantially so or else whenever the temperature of the engine cooling medium sinks underneath a predetermined value.
Inventors
- 👤 Pierre Gele
- 👤 Bernard Laprade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:56
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/12; F02M1/00; F02M1/08; F02M1/10; F02M17/00; F02M17/08; F02M17/09; F02M3/00; F02M3/005; Y; Y10; Y10S; Y10S261/00; Y10S261/19
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
203 words
In a carburettor fitted in the intake manifold of an internal combustion engine, operating under constant reduced pressure conditions, and comprising a main accelerator controlled throttle-valve in the manifold, an auxiliary throttling member subjected to the reduced pressure in the manifold on the upstream side of the main throttle valve and defining with the latter a fuel-and-air mixing chamber, an emulsion-forming chamber, a fuelfed jet opening into said emulsion-forming chamber and a needle valve controlling said jet and controlled by the auxiliary throttling member, the provision of at least one input port feeding air into the emulsion-forming chamber in amounts corresponding substantially to the complete burning of the fuel under idling and reduced load conditions, for which the auxiliary member is closed and of a connection between the emulsion-forming chamber and the mixing chamber including at least one horizontal small diameter tube provided with radial perforations, starting from the bottom of the emulsion-forming chamber, a large-diameter channel opening into the mixing chambeR and fed by said small diameter tube, and an air feeding channel starting from the upper end of the emulsion-forming chamber and opening obliquely into said large diameter channel above the end of the small-diameter tube feeding the large diameter channel.
Claim 2
Dependent Claim
203 words
In a carburettor fitted in the intake manifold of an internal combustion engine, operating under constant reduced pressure conditions, and comprising a main accelerator controlled throttle-valve in the manifold, an auxiliary throttling member subjected to the reduced pressure in the manifold on the upstream side of the main throttle valve and defining with the latter a fuel-and-air mixing chamber, an emulsion-forming chamber, a fuelfed jet opening into said emulsion-forming chamber and a needle valve controlling said jet and controlled by the auxiliary throttling member, the provision of at least one input port feeding air into the emulsion-forming chamber in amounts corresponding substantially to the complete burning of the fuel under idling and reduced load conditions, for which the auxiliary member is closed and of a connection between the emulsion-forming chamber and the mixing chamber including at least one horizontal small diameter tube provided with radial perforations, starting from the bottom of the emulsion-forming chamber, a large-diameter channel opening into the mixing chambeR and fed by said small diameter tube, and an air feeding channel starting from the upper end of the emulsion-forming chamber and opening obliquely into said large diameter channel above the end of the small-diameter tube feeding the large diameter channel.
Claim 3
Dependent Claim
80 words
A carburettor as claimed in claim 1, comprising a conical valve controlling one of the input ports and a member controlled by the rotary speed of the engine and by the position assumed by the main throttle valve and controlling said conical valve to thereby modify the cross-sectional area of the port and consequently the richness of the fuel-and-air mixture when the main throttle valve is substantially closed and the rotary speed of the engine is above a predetermined value.
Claim 4
Dependent Claim
138 words
A carburettor as claimed in claim 1, comprising a conical valve controlling one of the input ports, a vacuum chamber including a diaphragm controlling said conical valve, a three-way electrically controlled valve adapted to connect selectively the inside of the vacuum chamber with the external atmosphere and with a point of the engine intake manifold on the downstream side of the main throttle valve, a circuit energizing said valve, a tachometric relay controlled by the rotary speed of the engine, and a switch inserted in series with said relay in the valve energizing circuit to make said valve connect the vacuum box with the manifold whenever the main throttle valve is substantially closed and simultaneously the rotary speed of the engine is above a predetermined value, and connect the vacuum box with the atmosphere in all other cases.
Claim 5
Dependent Claim
178 words
A carburettor as claimed in claim 1, comprising a conical valve controlling one of the input ports, a vacuum chamber including a diaphragm controlling said conical valve, a three-way electrically controlled valve adapted to connect selectively the inside of the vacuum chamber with the external atmosphere and with a point of the engine intake manifold on the downstream side of the main throttle valve, a circuit energizing said valve, a tachometric relay controlled by the rotary speed of the engine, and a switch inserted in series with said relay in the valve energizing circuit to make the valve connect the vacuum box with the manifold whenever the main throttle valve is substantially closed and simultaneously the rotary speed of the engine is above a predetermined value, and connect the vacuum box with the atmosphere in all other cases, and a further switch controlled by the temperature of the engine-cooling medium and controlling the valve energizing circuit to make the valve connect the inside of the vacuum box with the manifold whenever said temperature sinks underneath a predetermined value.
Claim 6
Dependent Claim
196 words
a carburettor as claimed in claim 1, comprising a conical valve controlling one of the input ports, a vacuum chamber including a diaphragm controlling said conical valve, a three-way electrically controlled valve adapted to connect selectively the inside of the vacuum chamber with the external atmosphere and with a point of the engine intake manifold on the downstream side of the main throttle valve, a circuit energizing said valve, a tachometric relay controlled by the rotary speed of the engine, a switch inserted in series with said relay in the valve energizing circuit to make the valve connect the vacuum box with the manifold whenever the main throttle valve is substantially closed and simultaneously the rotary speed of the engine is above a predetermined value, and connect the vacuum box with the atmosphere in all other cases, a further switch controlled by the temperature of the engine-cooling medium and controlling the valve energizing circuit to make the valve connect the vacuum box with the manifold whenever said temperature sinks underneath a predetermined value and hand-operable means controlling the conical valve to make the latter close the corresponding port when starting the engine under low temperature conditions.
Claim 7
Dependent Claim
40 words
A carburettor as claimed in claim 1, comprising a conical valve controllIng one of the input ports and hand-operable means controlling the conical valve to make the latter close the corresponding port when starting the engine under low temperature conditions.
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |