US3669423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor
Assignee: Hitachi Ltd
•
Filing: 1970-05-20
•
Granted: 1972-06-13
•
Expires: 1990-05-20
Abstract
Abstract A carburetor capable of suitably controlling the fuel flow rate over the entire operational range of the associated engine using a three-dimensional-type fluidic device.
Inventors
- 👤 Yukio Hohsho
- 👤 Koichiro Yamada
- 👤 Yoshishige Oyama
- 👤 Takao Teranishi
- 👤 Seikou Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:08
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/10; F02M7/106; Y; Y10; Y10S; Y10S123/00; Y10S123/10; Y10S261/00; Y10S261/69; Y10T; Y10T137/00; Y10T137/206; Y10T137/218; Y10T137/2202
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
256 words
A carburetor comprising a carburetor body, a control chamber formed either integrally with or separately from said carburetor body, a fuel nozzle projecting into one end portion of said control chamber and constituting an end portion of a fuel supply conduit communicating with a fuel tank, a partition member provided in the other end portion of said control chamber in opposed relation to said fuel nozzle for dividing said portion into a fuel return reservoir and a fuel supply reservoir, said fuel supply reservoir being in communication with a Venturi within the air passage of the carburetor through a main fuel passage, a control nozzle projecting into said control chamber with its axis extending in crossing or adjacent relation to the axis of said fuel nozzle within said control chamber, an auxiliary control nozzle projecting into said control chamber at a location closer to said fuel nozzle than said coNtrol nozzle and a vent nozzle provided in said control chamber at a location opposite to said control nozzle and auxiliary control nozzle, said control nozzle being in communication with said Venturi or a portion of the air passage in the proximity of said Venturi, said auxiliary control nozzle being in communication with a portion of the air passage in the proximity of a throttle valve through a low speed fuel supply passage which is in communication with said fuel supply conduit and said vent nozzle being in communication with a portion of the air passage where the atmospheric pressure or a pressure approximate thereto will act.
Claim 2
Dependent Claim
256 words
A carburetor comprising a carburetor body, a control chamber formed either integrally with or separately from said carburetor body, a fuel nozzle projecting into one end portion of said control chamber and constituting an end portion of a fuel supply conduit communicating with a fuel tank, a partition member provided in the other end portion of said control chamber in opposed relation to said fuel nozzle for dividing said portion into a fuel return reservoir and a fuel supply reservoir, said fuel supply reservoir being in communication with a Venturi within the air passage of the carburetor through a main fuel passage, a control nozzle projecting into said control chamber with its axis extending in crossing or adjacent relation to the axis of said fuel nozzle within said control chamber, an auxiliary control nozzle projecting into said control chamber at a location closer to said fuel nozzle than said coNtrol nozzle and a vent nozzle provided in said control chamber at a location opposite to said control nozzle and auxiliary control nozzle, said control nozzle being in communication with said Venturi or a portion of the air passage in the proximity of said Venturi, said auxiliary control nozzle being in communication with a portion of the air passage in the proximity of a throttle valve through a low speed fuel supply passage which is in communication with said fuel supply conduit and said vent nozzle being in communication with a portion of the air passage where the atmospheric pressure or a pressure approximate thereto will act.
Claim 3
Dependent Claim
45 words
A carburetor as defined in claim 1, wherein a main restriction is provided in said main fuel passage and a fuel return passage communicating with the fuel tank is provided to open into said main fuel passage at a location upstream of said main restriction.
Claim 4
Dependent Claim
69 words
A carburetor as defined in claim 1, wherein said low speed fuel passage is communicated with an idle port which is open into the air passage at a location immediately downstream of the throttle valve and with a by-pass port which is open into said air passage at a location immediately upstream of said throttle valve, and an idle adjusting screw is provided in said low speed fuel passage.
Claim 5
Dependent Claim
54 words
A carburetor as defined in claim 1, wherein said control chamber is shaped into a rectangle or a shape similar thereto in cross-section and the line of the top edge of said partition member is traced such that the area of the fuel supply reservoir projects into the area of the fuel return reservoir.
Claim 6
Dependent Claim
18 words
A carburetor as defined in claim 1, wherein an air bleed is provided in said main fuel passage.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |