US3779529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential diaphragm carburetor
Assignee: Mikuni Corp
•
Filing: 1972-03-13
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Granted: 1973-12-18
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Expires: 1992-03-13
Abstract
Abstract A differential diaphragm carburetor for an internal combustion engine comprising two diaphragms of different size interlocked with each other and one of said diaphragm interlocking with a valve which controls inflow of fuel to the carburetor from a fuel supply system, whereby the negative pressure in the fuel mixing chamber is applied to either one or both of the diaphragms and the operation of the valve is regulated by the difference in the size of the two diaphragms.
Inventors
- 👤 R Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:05
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/02; F02M17/04; Y; Y10; Y10S; Y10S261/00; Y10S261/68
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
138 words
A differential diaphragm carburetor for an internal combustion engine comprising a negative chamber which communicates with a nozzle for introducing fuel to a fuel mixing chamber; a fuel pressure regulating chamber which communicates with the negative pressure chamber by way of a passage having a fuel jet orifice; a valve which controls inflow of fuel into the fuel-pressure-regulating chamber; whereby at least one wall of said negative pressure chamber and at least one wall of said fuel-pressure-regulating chamber consist of respectively a negative pressure diaphragm and a fuel-pressure-regulating diaphragm; said two diaphragms being interlocked with each other by means of a movement-transmitting means; said valve being interlocked with said fuel pressure regulating diaphragm; and said two diaphragms have different effective areas so as to create a desired fuel pressure on the upstream side of said fuel jet orifice.
Claim 2
Dependent Claim
138 words
A differential diaphragm carburetor for an internal combustion engine comprising a negative chamber which communicates with a nozzle for introducing fuel to a fuel mixing chamber; a fuel pressure regulating chamber which communicates with the negative pressure chamber by way of a passage having a fuel jet orifice; a valve which controls inflow of fuel into the fuel-pressure-regulating chamber; whereby at least one wall of said negative pressure chamber and at least one wall of said fuel-pressure-regulating chamber consist of respectively a negative pressure diaphragm and a fuel-pressure-regulating diaphragm; said two diaphragms being interlocked with each other by means of a movement-transmitting means; said valve being interlocked with said fuel pressure regulating diaphragm; and said two diaphragms have different effective areas so as to create a desired fuel pressure on the upstream side of said fuel jet orifice.
Claim 3
Dependent Claim
82 words
A differential diaphragm carburetor as described in claim 1, wherein said negative pressure chamber is contiguous to the fuel-pressure-regulating chamber separated by the negative pressure diaphragm; the fuel pressure regulating chamber is contiguous to an atmospheric chamber separated by the fuel pressure regulating diaphragm; the fuel pressure regulating chamber communicates with a fuel supply system, and the fuel-pressure-regulating diaphragm is interlocked by means of a lever means with a valve controlling the passage between the fuel-pressure-regulating chamber and the fuel supply system.
Claim 4
Dependent Claim
26 words
A differential diaphragm carburetor as described in claim 2, wherein the diaphragms are supported by annular plates of sizes suitable to create a desired area difference.
Claim 5
Dependent Claim
26 words
A differential diaphragm carburetor as described in claim 3, wherein the negative pressure diaPhragm and the fuel pressure regulating diaphragm are interlocked by a resilient member.
Claim 6
Dependent Claim
86 words
A differential diaphragm carburetor as described in claim 4, wherein said valve is a poppet valve placed in the passage connecting the fuel-pressure-regulating chamber and the fuel supply system, said poppet valve being supported by a resilient member so as to close the passage when the engine is not in operation, and a lever supported by a fulcrum which is provided in the fuel-pressure-regulating chamber and one end of which is connected with the poppet valve and the other end is connected to the fuel-pressure-regulating diaphragm.
Claim 7
Dependent Claim
59 words
A differential diaphragm carburetor as described in claim 1, wherein the negative pressure chamber is contiguous to an atmospheric pressure chamber separated by the negative pressure diaphragm; the fuel pressure regulating chamber is contiguous to the atmospheric pressure chamber separated by the fuel-pressure-regulating diaphragm; and the negative pressure diaphragm and the fuel-pressure-regulating diaphragm are interlocked by a lever means.
Claim 8
Dependent Claim
26 words
A differential diaphragm carburetor as described in claim 6, wherein the diaphragms are supported by annular plates of sizes suitable to create a desired area difference.
Claim 9
Dependent Claim
23 words
A differential diaphragm carburetor as described in claim 7, wherein the fuel-pressure-regulating diaphragm and the lever means are connected with a resilient means.
Claim 10
Dependent Claim
42 words
A differential diaphragm carburetor as described in claim 8 wherein the valve controlling inflow of fuel is a poppet valve which closes the fuel passage, in which it is placed, from the fuel supply system side, being pressed by a resilient means.
Claim 11
Dependent Claim
58 words
A differential diaphragm carburetor as described in claim 9, wherein a fuel chamber is provided at a position opposite to the negative pressure diaphragm, whereby said fuel chamber communicates with the fuel supply system, is provided with a third diaphragm as the partition opposing to the negative diaphragm, and the third diaphragm is interlocked with the lever means.
Claim 12
Dependent Claim
18 words
A differential diaphragm carburetor as described in claim 10, wherein said interlocking is effected by a resilient means.
Claim 13
Dependent Claim
38 words
A differential diaphragm carburetor as described in claim 1, wherein the negative pressure chamber is contiguous to the fuel pressure regulating chamber; and the atmospheric pressure chamber respectively separated by the fuel-pressure-regulating diaphragm and the negative pressure diaphragm.
Claim 14
Dependent Claim
26 words
A differential diaphragm carburetor as described in claim 12, wherein the diaphragms are supported by annular plates of sizes suitable to create a desired area difference.
Claim 15
Dependent Claim
18 words
A differential diaphragm carburetor as described in claim 13, wherein the diaphragms are interlocked with a resilient member.
Claim 16
Dependent Claim
43 words
A differential diaphragm carburetor as described in claim 14, wherein the valve is a poppet valve which closes the passage connecting the fuel pressure regulating chamber and the fuel supply system from the fuel supply system side being pressed by a resilient means.
Claim 17
Dependent Claim
66 words
A differential diaphragm carburetor as described in claim 15, wherein a fuel chamber is provided contiguous to the atmospheric pressure chamber on the opposite side of the negative pressure chamber separated by a third diaphragm, whereby the fuel chamber communicates with a valve chamber which communicates with the fuel-pressure-regulating chamber and the fuel supply system; and the third diaphragm is interlocked with the negative pressure diaphragm.
Claim 18
Dependent Claim
28 words
A differential diaphragm carburetor as described in claim 6, wherein the negative pressure chamber and the fuel-pressure-regulating chamber are placed on opposite sides of said atmospheric pressure chamber.
Claim 19
Dependent Claim
26 words
A differential diaphragm carburetor as described in claim 17, wherein the diaphragms are supported by annular plates of sizes suitable to create a desired area difference.
Claim 20
Dependent Claim
42 words
A differential diaphragm carburetor as described in claim 18, wherein the valve controlling inflow of fuEl is a poppet valve which closes the fuel passage in which it is placed from the fuel supply system side being pressed by a resilient means.
Claim 21
Dependent Claim
36 words
A differential diaphragm carburetor as described in claim 17, wherein the negative pressure diaphragm is of annular shape and is provided with a cylindrical means which contains an elongated nozzle of the needle valve receiving type.
Claim 22
Dependent Claim
26 words
A differential diaphragm carburetor as described in claim 20, wherein the diaphragms are supported by annular plates of sizes suitable to create a desired area difference.
Claim 23
Dependent Claim
42 words
A differential diaphragm carburetor as described in claim 21, wherein the valve controlling inflow of fuel is a poppet valve which closes the fuel passage in which it is placed from the fuel supply system side being pressed by a resilient means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |