Patent US1787335A successfully refreshed from Google Patents.
US4119684A
Expired / Lapsed
US
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Variable stage type carburetor
Assignee: Hitachi Ltd
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Filing: 1977-10-04
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Granted: 1978-10-10
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Expires: 1997-10-04
Abstract
Abstract A variable stage type carburetor has a vane controller adapted to forcibly bias a vane to a smaller opening degree when a throttle valve has been opened nearly to the maximum opening degree and, accordingly, the venturi vacuum is small. Between a limiting lever connected to a diaphragm of the vane controller and an interlocking lever connected to the vane, provided is an interlocking spring for affording a relative movement between the vane and the throttle valve. The interlocking spring can be deflected with a reduced force when the throttle valve has been opened nearly to the maximum opening degree.
Inventors
- 👤 Kimiji Karino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:31
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/08; F02M17/09; F02M9/00; F02M9/10; F02M9/106; Y; Y10; Y10S; Y10S261/00; Y10S261/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A variable stage carburetor having a throttle valve disposed in the intake passage thereof, a vane constituting a variable venturi and disposed at the upstream side of said throttle valve, said vane being operably connected to said throttle valve, fuel metering means disposed in a fuel passage opening in said venturi and adapted to vary the cross-sectional area of said fuel passage in response to the change of opening degree of said vane, and a vane controller adapted to be actuated by the vacuum available at said venturi so as to forcibly displace said vane to a lower opening degree when said throttle valve has been opened nearly to the maximum opening degree to reduce said vacuum at said venturi, characterized by comprising an interlocking spring acting between a limiting lever connected to a diaphragm of said vane controller and an interlocking lever connected to said vane.
Claim 2
Dependent Claim
147 words
A variable stage carburetor having a throttle valve disposed in the intake passage thereof, a vane constituting a variable venturi and disposed at the upstream side of said throttle valve, said vane being operably connected to said throttle valve, fuel metering means disposed in a fuel passage opening in said venturi and adapted to vary the cross-sectional area of said fuel passage in response to the change of opening degree of said vane, and a vane controller adapted to be actuated by the vacuum available at said venturi so as to forcibly displace said vane to a lower opening degree when said throttle valve has been opened nearly to the maximum opening degree to reduce said vacuum at said venturi, characterized by comprising an interlocking spring acting between a limiting lever connected to a diaphragm of said vane controller and an interlocking lever connected to said vane.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |