US3825237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel feeding & charge forming apparatus
Assignee: Nikki Co Ltd
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Filing: 1971-11-22
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Granted: 1974-07-23
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Expires: 1991-11-22
Abstract
Abstract A carburetor and fuel feeding arrangement for internal combustion engines which includes a substantially horizontally extending mixing passage with venturi and a fuel chamber located below said passage. A diaphragm constitutes an upper wall of the fuel chamber and is adapted to operate a fuel inlet valve. The diaphragm also forms a lower wall of a chamber which communicates with the atmosphere. A main fuel discharge orifice is positioned substantially on the center line of the diaphragm. A slow fuel passage branches from a fuel passage connecting the fuel chamber and the orifice and communicates with secondary orifices. Means is provided for discharging into the fuel passages the vapor generated when the apparatus is tilted to extreme positions or inverted. Means between the main fuel passage and the slow fuel passage is provided for preventing the flow of air from the main orifice to the secondary orifices during idling or slow speed motion of an engine.
Inventors
- 👤 T Aoyama
- 👤 K Kamosawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/02; F02M17/04; Y; Y10; Y10S; Y10S261/00; Y10S261/68
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
In combination, a fuel feeding apparatus including a body having a mixing passage, an air chamber in said body including an upper wall, a flexible diaphragm forming a lower wall of said air chamber, a fuel chamber in a body including a lower wall and an upper wall formed by said diaphragm, said diaphragm being actuated by aspiration in said mixing passage, a second chamber at the center of said fuel chamber for storing fuel from said chamber, a main fuel discharge orifice and secondary orifices opening into said mixing passage, two passages connecting said second chamber with said orifices, a vapor discharging passage connecting said second chamber with said fuel chamber, a valve means opening the vapor discharging passage only when the apparatus is tilted to extreme positions or inverted, to connect said two chambers.
Claim 2
Dependent Claim
136 words
In combination, a fuel feeding apparatus including a body having a mixing passage, an air chamber in said body including an upper wall, a flexible diaphragm forming a lower wall of said air chamber, a fuel chamber in a body including a lower wall and an upper wall formed by said diaphragm, said diaphragm being actuated by aspiration in said mixing passage, a second chamber at the center of said fuel chamber for storing fuel from said chamber, a main fuel discharge orifice and secondary orifices opening into said mixing passage, two passages connecting said second chamber with said orifices, a vapor discharging passage connecting said second chamber with said fuel chamber, a valve means opening the vapor discharging passage only when the apparatus is tilted to extreme positions or inverted, to connect said two chambers.
Claim 3
Dependent Claim
206 words
In combination, fuel feeding apparatus including a first body having a mixing passage, an upper air chamber in said first body including an upper wall, a flexible diaphragm forming a lower wall of the air chamber, a lower fuel chamber in a second body including a lower wall and an upper wall formed by said diaphragm, said diaphragm being fixed at its periphery and its center to said two bodies and actuatable by aspiration in said mixing passage, a fuel inlet for said fuel chamber, a fuel inlet valve in said fuel inlet, spring loaded means for opening and closing said valve in response to movement of said diaphragm, a second chamber in the center portion of said second body for storing fuel from the said fuel chamber, a main fuel discharge orifice and secondary orifices opening into the said mixing passage, and two passages connecting the said second chamber with said orifices, said combination further defined by the formula: phi h W/A wherein h is the distance between the mouth of the said orifice and the center of the underside of said diaphragm, A is the effective area of said diaphragm, W is the weight of said diaphragm, phi is the specific gravity of fuel.
Claim 4
Dependent Claim
206 words
In combination, fuel feeding apparatus including a first body having a mixing passage, an upper air chamber in said first body including an upper wall, a flexible diaphragm forming a lower wall of the air chamber, a lower fuel chamber in a second body including a lower wall and an upper wall formed by said diaphragm, said diaphragm being fixed at its periphery and its center to said two bodies and actuatable by aspiration in said mixing passage, a fuel inlet for said fuel chamber, a fuel inlet valve in said fuel inlet, spring loaded means for opening and closing said valve in response to movement of said diaphragm, a second chamber in the center portion of said second body for storing fuel from the said fuel chamber, a main fuel discharge orifice and secondary orifices opening into the said mixing passage, and two passages connecting the said second chamber with said orifices, said combination further defined by the formula: phi h W/A wherein h is the distance between the mouth of the said orifice and the center of the underside of said diaphragm, A is the effective area of said diaphragm, W is the weight of said diaphragm, phi is the specific gravity of fuel.
Claim 5
Dependent Claim
162 words
In combination, a fuel feeding apparatus including a first body having a mixing passage, an upper air chamber in said first body including an upper wall, a flexible diaphragm forming a lower wall of said chamber, a lower fuel chamber in a second body including a lower wall and an upper wall formed by said diaphragm, said diaphragm being fixed at its periphery and its center to said two bodies and actuatable bY aspiration in said mixing passage, a fuel inlet for said fuel chamber a fuel inlet valve in said fuel inlet, means operable by said diaphragm, but normally for closing said valve, a second chamber in the center portion of said second body for storing fuel from the top of said fuel chamber, a main fuel discharge orifice and secondary orifices opening into said mixing passage, and two passages connecting the said second chamber with said orifices, said main fuel discharge orifice positioned on the center line of said diaphragm.
Claim 6
Dependent Claim
162 words
In combination, a fuel feeding apparatus including a first body having a mixing passage, an upper air chamber in said first body including an upper wall, a flexible diaphragm forming a lower wall of said chamber, a lower fuel chamber in a second body including a lower wall and an upper wall formed by said diaphragm, said diaphragm being fixed at its periphery and its center to said two bodies and actuatable bY aspiration in said mixing passage, a fuel inlet for said fuel chamber a fuel inlet valve in said fuel inlet, means operable by said diaphragm, but normally for closing said valve, a second chamber in the center portion of said second body for storing fuel from the top of said fuel chamber, a main fuel discharge orifice and secondary orifices opening into said mixing passage, and two passages connecting the said second chamber with said orifices, said main fuel discharge orifice positioned on the center line of said diaphragm.
Claim 7
Dependent Claim
176 words
In combination, a fuel feeding apparatus including a first body having a mixing passage, an upper air chamber in said first body including an upper wall, a flexible diaphragm forming a lower wall of said air chamber, a lower fuel chamber in a second body including a lower wall and an upper wall formed by said diaphragm, said diaphragm being fixed at its periphery and its center to said two bodies and actuatable by aspiration in said mixing passage, a fuel inlet valve in said fuel inlet means operable by movement of said diaphragm, but normally for closing said valve, a second chamber in the center portion of said second body for storing fuel from said chamber, a main fuel discharge orifice and secondary orifices opening into said mixing passage, two passages connecting said second chamber with said orifices, a vapor discharging passage connecting said second chamber with said fuel chamber, and a valve means opening the vapor discharging passage only when the apparatus is tilted to extreme positions or inverted, to connect said two chambers.
Claim 8
Dependent Claim
176 words
In combination, a fuel feeding apparatus including a first body having a mixing passage, an upper air chamber in said first body including an upper wall, a flexible diaphragm forming a lower wall of said air chamber, a lower fuel chamber in a second body including a lower wall and an upper wall formed by said diaphragm, said diaphragm being fixed at its periphery and its center to said two bodies and actuatable by aspiration in said mixing passage, a fuel inlet valve in said fuel inlet means operable by movement of said diaphragm, but normally for closing said valve, a second chamber in the center portion of said second body for storing fuel from said chamber, a main fuel discharge orifice and secondary orifices opening into said mixing passage, two passages connecting said second chamber with said orifices, a vapor discharging passage connecting said second chamber with said fuel chamber, and a valve means opening the vapor discharging passage only when the apparatus is tilted to extreme positions or inverted, to connect said two chambers.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |