Patent US4129620A successfully refreshed from Google Patents.
US4129620A
Expired / Lapsed
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Fuel changeover system for multi-fuel engines
Assignee: Subaru Corp
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Filing: 1977-08-29
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Granted: 1978-12-12
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Expires: 1997-08-29
Abstract
Abstract Fuel changeover system for a multi-fuel engine of the type which may be driven by various fuels such as gasoline and kerosene, which enables the engine to continue the operation by another fuel when one of the fuels has run out. The system comprises two float chambers for two kinds of fuel and a cock with passages adapted to communicate both float chambers with each other for introducing the remaining fuel into the empty float chamber. The system, further, comprises a gasoline reservoir and valve means for supplying the gasoline in the reservoir to the carburetor in order to start the engine, when the gasoline in the float chamber runs out.
Inventors
- 👤 Motoaki Etoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:05
CPC Classifications
F; F02; F02M; F02M13/00; F02M13/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
Fuel changeover system for multi-fuel engines comprising wall means forming a first float chamber for lighter fuel and a second float chamber for heavier fuel, a lighter fuel reservoir provided adjacent to said first float chamber, a passage communicating said lighter fuel reservoir with said lighter fuel float chamber at a level higher than the level of heavier fuel in said heavier fuel float chamber, a cock provided for regulation of both of the fuels, first and second valve passages provided in said cock, a first passage adapted to communicate the bottom of said lighter fuel reservoir with said cock, a second passage adapted to communicate said lighter fuel float chamber with said cock, a third passage adapted to communicate said heavier fuel float chamber with said cock, said second valve passage being adapted to communicate said second and third passages with each other, and a passage for communicating said first valve passage in the cock with the nozzle of carburetor.
Claim 2
Dependent Claim
161 words
Fuel changeover system for multi-fuel engines comprising wall means forming a first float chamber for lighter fuel and a second float chamber for heavier fuel, a lighter fuel reservoir provided adjacent to said first float chamber, a passage communicating said lighter fuel reservoir with said lighter fuel float chamber at a level higher than the level of heavier fuel in said heavier fuel float chamber, a cock provided for regulation of both of the fuels, first and second valve passages provided in said cock, a first passage adapted to communicate the bottom of said lighter fuel reservoir with said cock, a second passage adapted to communicate said lighter fuel float chamber with said cock, a third passage adapted to communicate said heavier fuel float chamber with said cock, said second valve passage being adapted to communicate said second and third passages with each other, and a passage for communicating said first valve passage in the cock with the nozzle of carburetor.
Claim 3
Dependent Claim
189 words
Fuel changeover system for multi-fuel engines comprising wall means forming a first float chamber for lighter fuel and a second float chamber for heavier fuel, a lighter fuel reservoir provided adjacent to said first float chamber, a passage communicating said lighter fuel reservoir with said lighter fuel float chamber at a level higher than the level of heavier fuel in said heavier fuel float chamber, a cock provided for regulation of both of the fuels, first and second valve passages radially provided in said cock, said first and second valve passages being interconnected at the center of said cock, a first passage adapted to communicate the bottom of said lighter fuel reservoir with said cock, a second passage adapted to communicate said lighter fuel float chamber with said cock, a third passage adapted to communicate said heavier fuel float chamber with said cock, said second valve passage being adapted to communicate said second and third passages with each other, and a passage axially provided in said cock for communication with said interconnecting portion of said first and second valve passages and extended to the rear end of the cock.
Claim 4
Dependent Claim
189 words
Fuel changeover system for multi-fuel engines comprising wall means forming a first float chamber for lighter fuel and a second float chamber for heavier fuel, a lighter fuel reservoir provided adjacent to said first float chamber, a passage communicating said lighter fuel reservoir with said lighter fuel float chamber at a level higher than the level of heavier fuel in said heavier fuel float chamber, a cock provided for regulation of both of the fuels, first and second valve passages radially provided in said cock, said first and second valve passages being interconnected at the center of said cock, a first passage adapted to communicate the bottom of said lighter fuel reservoir with said cock, a second passage adapted to communicate said lighter fuel float chamber with said cock, a third passage adapted to communicate said heavier fuel float chamber with said cock, said second valve passage being adapted to communicate said second and third passages with each other, and a passage axially provided in said cock for communication with said interconnecting portion of said first and second valve passages and extended to the rear end of the cock.
Claim 5
Dependent Claim
195 words
Fuel changeover system for multi-fuel engines comprising wall means forming a first float chamber for lighter fuel and a second float chamber for heavier fuel, said both float chambers being separated by a partition, a lighter fuel reservoir provided in said partition, a passage communicating said lighter fuel reservoir with said lighter fuel float chamber at a level higher than the level of heavier fuel in said heavier fuel float chamber, a cock provided for regulation of both of the fuels, first and second valve passages radially provided in said cock, said first and second valve passages being interconnected at the center of said cock, a first passage adapted to communicate the bottom of said lighter fuel reservoir with said cock, a second passage adapted to communicate said lighter fuel float chamber with said cock, a third passage adapted to communicate said heavier fuel float chamber with said cock, said second valve passage being adapted to communicate said second and third passages with each other, and a passage axially provided in said cock for communication with said interconnecting portion of said first and second valve passages and extended to the rear end of the cock.
Claim 6
Dependent Claim
195 words
Fuel changeover system for multi-fuel engines comprising wall means forming a first float chamber for lighter fuel and a second float chamber for heavier fuel, said both float chambers being separated by a partition, a lighter fuel reservoir provided in said partition, a passage communicating said lighter fuel reservoir with said lighter fuel float chamber at a level higher than the level of heavier fuel in said heavier fuel float chamber, a cock provided for regulation of both of the fuels, first and second valve passages radially provided in said cock, said first and second valve passages being interconnected at the center of said cock, a first passage adapted to communicate the bottom of said lighter fuel reservoir with said cock, a second passage adapted to communicate said lighter fuel float chamber with said cock, a third passage adapted to communicate said heavier fuel float chamber with said cock, said second valve passage being adapted to communicate said second and third passages with each other, and a passage axially provided in said cock for communication with said interconnecting portion of said first and second valve passages and extended to the rear end of the cock.
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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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |