Patent US3633557A successfully refreshed from Google Patents.
US3633557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm carburetor
Assignee: Wallro Corp
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Filing: 1970-01-30
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Granted: 1972-01-11
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Expires: 1990-01-30
Abstract
Abstract A diaphragm carburetor system and construction in which the fuel supply for the main jet and the idle jet is brought from a diaphragm chamber through a main jet control valve and the idle jet control valve in series. A passage is provided in the carburetor to receive crankcase pulses from the two-cycle engine being controlled, and to expose these pulses to the idle system so that under full throttle conditions the pulses will be open to the idle system to blow collected fuel in that system back to the main jet as an acceleration charge and also to dry out the idle system so that upon the closing of the throttle there will be a delayed fuel flow through the idle system to prevent overrich comedown. This is accomplished by surface passages and a circuit gasket in the top wall of the diaphragm chamber to simplify the construction of the system.
Inventors
- 👤 Charles H Tuckey
- 👤 Kenneth C Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:45
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/06; F02M17/00; F02M17/02; F02M17/04; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y10; Y10S; Y10S261/00; Y10S261/68
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
197 words
In a carburetor system for an internal combustion engine including a carburetor body with a main nozzle and an idle port leading to a mixing passage and a throttle valve in said passage movable from a closed to an open position, that improvement which comprises: a. means forming a fuel inlet in said body, b. passageways in said body placing said main fuel nozzle in series between said fuel inlet and said idle port, c. a manual main control valve in said passageways ahead of said main fuel nozzle and an idle control valve in said passageways ahead of said idle port, said valves having openings respectively decreasing in effective size, d. a crankcase pulse passageway adapted to be connected at one end to the crankcase of an engine to which fuel is being delivered and connected directly at the other end to said passageway between said idle control valve and said idle port, and e. valve means in said crankcase pulse passageway associated with said throttle valve to open said crankcase pulse passageway when said throttle is moved to open position to move all the fuel out of the idle fuel passageway under open throttle conditions.
Claim 2
Dependent Claim
197 words
In a carburetor system for an internal combustion engine including a carburetor body with a main nozzle and an idle port leading to a mixing passage and a throttle valve in said passage movable from a closed to an open position, that improvement which comprises: a. means forming a fuel inlet in said body, b. passageways in said body placing said main fuel nozzle in series between said fuel inlet and said idle port, c. a manual main control valve in said passageways ahead of said main fuel nozzle and an idle control valve in said passageways ahead of said idle port, said valves having openings respectively decreasing in effective size, d. a crankcase pulse passageway adapted to be connected at one end to the crankcase of an engine to which fuel is being delivered and connected directly at the other end to said passageway between said idle control valve and said idle port, and e. valve means in said crankcase pulse passageway associated with said throttle valve to open said crankcase pulse passageway when said throttle is moved to open position to move all the fuel out of the idle fuel passageway under open throttle conditions.
Claim 3
Dependent Claim
77 words
A carburetor system as defined in claim 1 in which the carburetor body includes a diaphragm chamber having one wall formed by said body, a diaphragm in said chamber, and a valve controlled by said diaphragm to admit fuel to said chamber and thence to the fuel inlet, said passageways in said body being formed in part in said one wall of said body and in part by openings in a circuit gasket lying adjacent said wall.
Claim 4
Dependent Claim
116 words
A carburetor system as defined in claim 1 in which the carburetor body includes a diaphragm chamber having one wall formed by said body, a diaphragm in said chamber and a valve controlled by said diaphragm to admit fuel to said chamber and thence to the fuel inlet, said passageways in said body being formed in part as a plurality of unconnected surface openings in said one wall of said body and in part as a plurality of unconnected perforate openings in a circuit gasket, said respective openings being disposed to interconnect, and means to close said openings on one side of said gasket and hold said gasket tightly against said one wall of said body.
Claim 5
Dependent Claim
155 words
A carburetor and two-cycle engine combination in which the Carburetor is mounted on the engine, the carburetor having a main nozzle and one or more idle ports leading to a mixing passage and a throttle valve in said passage movable from a closed to open position, that improvement which comprises: a. means forming a fuel flow passage from a fuel inlet to a main nozzle opening, thence to an idle passage leading to an idle port opening, b. means forming a passage from the crankcase of an engine through said carburetor to said fuel flow passage between said main nozzle opening and said idle port opening to convey crankcase pulse pressure to said fuel flow passage, and c. means associated with said throttle valve responsive to movement of said throttle valve to open position to open said pulse pressure passage to force fuel out of said idle passage during open throttle conditions of said carburetor.
Claim 6
Dependent Claim
155 words
A carburetor and two-cycle engine combination in which the Carburetor is mounted on the engine, the carburetor having a main nozzle and one or more idle ports leading to a mixing passage and a throttle valve in said passage movable from a closed to open position, that improvement which comprises: a. means forming a fuel flow passage from a fuel inlet to a main nozzle opening, thence to an idle passage leading to an idle port opening, b. means forming a passage from the crankcase of an engine through said carburetor to said fuel flow passage between said main nozzle opening and said idle port opening to convey crankcase pulse pressure to said fuel flow passage, and c. means associated with said throttle valve responsive to movement of said throttle valve to open position to open said pulse pressure passage to force fuel out of said idle passage during open throttle conditions of said carburetor.
Claim 7
Dependent Claim
94 words
A carburetor as defined in claim 4 in which the means forming said fuel flow passage comprises a wall of said carburetor having passages cut into its surface, a circuit gasket having perforate passages formed therein and positioned to form continuous passages formed therein and positioned to form continuous passages in conjunction with the surface passages of said wall, and a closing plate overlying said circuit gasket closing one side of said perforate passages and pressing said gasket tightly on said surface to confirm and isolate said passages in said surface and said gasket.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |