US3690304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor construction to eliminate fuel accumulation at the reed valve
Assignee: Walbro Corp
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Filing: 1970-01-16
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Granted: 1972-09-12
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Expires: 1990-01-16
Abstract
Abstract A uni-directional valve arrangement for two-cycle internal combustion engines which eliminates undesirable collection of pockets of fuel in the carburetor system and the resultant undesirable running characteristics, this being accomplished by venting from the mixing chamber of the carburetor system directly to the areas surrounding the unidirectional or ''''reed'''' valves so that an air fuel mixture moves through the restricted and dead pocket areas to keep them clean of fuel collections, thus preventing overrich comedown when a throttle is closed and preventing flooding under other running conditions.
Inventors
- 👤 Kenneth C Schneider
- 👤 Charles H Tuckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:54
CPC Classifications
F; F02; F02M; F02M33/00; F02M33/02; F02M33/04; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
In an engine and carburetor combination wherein fuel and air mixture is introduced through a unidirectional valve, that improvement which comprises a unidirectional valve interposed between the mixing passage of the carburetor and the fuel passage of a crankcase housing of the engine, and means providing a plurality of fuel-air passages uncontrolled by said valve leading from the mixing passage of the carburetor to space in said fuel passage of the crankcase housing surrounding and outside said valve to sweep any accumulated liquid fuel into the crankcase housing.
Claim 2
Dependent Claim
88 words
In an engine and carburetor combination wherein fuel and air mixture is introduced through a unidirectional valve, that improvement which comprises a unidirectional valve interposed between the mixing passage of the carburetor and the fuel passage of a crankcase housing of the engine, and means providing a plurality of fuel-air passages uncontrolled by said valve leading from the mixing passage of the carburetor to space in said fuel passage of the crankcase housing surrounding and outside said valve to sweep any accumulated liquid fuel into the crankcase housing.
References Cited (Backward Citations)
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |