US3746321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor
Assignee: PONTAC J DE
•
Filing: 1971-08-05
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Granted: 1973-07-17
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Expires: 1991-08-05
Abstract
Abstract A carburetor has a main throat, a separate constant level chamber for fuel, means to introduce liquid fuel into said constant level chamber, a separate injection chamber, a nozzle through which fuel passes from the constant level chamber to the injection chamber, a needle of variable cross section movable in that nozzle to vary the total cross section of said nozzle, and means by which the injection chamber communicates with the throat. A first lower cover plate has openings therethrough and a second upper cover plate has openings therein that communicate with the openings of the first cover plate. Some of the openings of the second cover plate are disposed in and extend laterally of the lower face thereof. An atmospheric pressure corrector is carried by the upper plate to open and close one of those openings according to atmospheric pressure. A fuel richness corrector operates through one of the openings to adjust the richness of the fuel mixture. An air inlet to the throat is formed on the second plate, and a control shutter is rotatably mounted in that inlet.
Inventors
- 👤 Pontac J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:21
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/02; F02M3/04; F02M3/042; F02M7/00; Y; Y10; Y10S; Y10S261/00; Y10S261/19; Y10S261/67
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
197 words
A carburetor having a main throat, a separate constant level chamber for fuel, means to introduce liquid fuel into said constant level chamber, a separate injection chamber, a nozzle through which fuel passes from said constant level chamber to said injection chamber, a needle of variable cross section movable in said nozzle to vary the total cross section of said nozzle, means by which said injection chamber communicates with said throat, a first lower cover plate having openings therethrough, a second upper cover plate having openings therein that communicate with said openings of said first cover plate, some of said openings of said second cover plate being disposed in and extending laterally along the lower face of said second cover plate, an atmospheric pressure corrector carried by said upper plate to open and close one of said openings according to atmospheric pressure, a fuel richness corrector operable through one of said openings to adjust the richness of the fuel mixture, means operable through two of said openings to control the position of said needle in said nozzle, an air inlet to said throat formed on said second plate, and a control shutter rotatably mounted in said inlet.
Claim 2
Dependent Claim
197 words
A carburetor having a main throat, a separate constant level chamber for fuel, means to introduce liquid fuel into said constant level chamber, a separate injection chamber, a nozzle through which fuel passes from said constant level chamber to said injection chamber, a needle of variable cross section movable in said nozzle to vary the total cross section of said nozzle, means by which said injection chamber communicates with said throat, a first lower cover plate having openings therethrough, a second upper cover plate having openings therein that communicate with said openings of said first cover plate, some of said openings of said second cover plate being disposed in and extending laterally along the lower face of said second cover plate, an atmospheric pressure corrector carried by said upper plate to open and close one of said openings according to atmospheric pressure, a fuel richness corrector operable through one of said openings to adjust the richness of the fuel mixture, means operable through two of said openings to control the position of said needle in said nozzle, an air inlet to said throat formed on said second plate, and a control shutter rotatably mounted in said inlet.
Claim 3
Dependent Claim
29 words
A carburetor as claimed in claim 1, said means to supply fuel to said constant level chamber comprising a fuel conduit that passes through and interconnects said two plates.
Claim 4
Dependent Claim
149 words
A carburetor as claimed in claim 1, and means establishing a vacuum control means for the injection chamber, said vacuum control means comprising two fluid circuits in parallel, the first fluid circuit comprising an air inlet opening controlled by said atmospheric pressure corrector, a richness control cylinder for closing said first circuit to start the motor and for partially closing said first circuit when the motor is cold and an opening for communication between said first circuit and the constant level chamber, a valve for closing the last-named opening responsive to the vacuum prevailing in The carburetor, said second circuit comprising an air intake upstream of a vacuum shutter, a valve for temporarily closing said second circuit when the carburetor rapidly opens, and a passage controlled by an economizer valve responsive to vacuum in the throat immediately upstream of said shutter when said shutter is in a closed position.
Claim 5
Dependent Claim
98 words
A carburetor as claimed in claim 1, said atmospheric corrector comprising a disc having a calibrated opening therethrough interchangeably mounted in an opening of the upper cover plate, a rod coaxial with the opening of the disc and carried by the lower cover plate, a cone slidably mounted on said rod, a manometric bellows to which said cone is secured, a sleeve secured to said bellows, and a shaft passing through said sleeve and secured at its ends to the walls of a tubular chamber that houses the bellows and that is secured to said upper cover plate.
Claim 6
Dependent Claim
53 words
A carburetor as claimed in claim 4, said richness corrector comprising a cylinder mounted rotatably in a cylindrical chamber defined by recesses in said upper and lower cover plates below said atmospheric corrector, said calibrated disc being disposed between said cylinder and said upper cover plate, said rod being carried by said cylinder.
Claim 7
Dependent Claim
109 words
A carburetor as claimed in claim 3, the valve which temporarily closes said second circuit comprising a rod secured to an arm that swings with said shutter, said rod passing fluid tightly through the upper cover plate and descending into a cylindrical chamber disposed in said constant level chamber, a piston on said rod that slides in said cylindrical chamber, said cylindrical chamber being closed at both ends but having a calibrated orifice at its lower end for the admission of fuel from the constant level chamber and having an opening through said cylindrical chamber that communicates between the constant level chamber and said cylindrical chamber above said piston.
Claim 8
Dependent Claim
37 words
A carburetor as claimed in claim 6, said piston being mounted with clearance on said rod and bearing on a conical support surface at the lower end of the rod so as to comprise a one-way valve.
Claim 9
Dependent Claim
31 words
A carburetor as claimed in claim 7, said rod and said needle being interconnected with said arm by means of cylindrical sleeves in which are rotatably and slidably disposed truncated spheres.
Claim 10
Dependent Claim
23 words
A carburetor as claimed in claim 1, and a compressor for feeding compressed air both to said throat and to said atmospheric corrector.
Claim 11
Dependent Claim
26 words
A carburetor as claimed in claim 9, and means actuating the compressor only at high speed operation of the motor to which the carburetor is attached.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |