US3927657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Throttle return systems for carburettors
Assignee: Societe Industrielle de Brevets et dEtudes SIBE
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Filing: 1974-03-26
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Granted: 1975-12-23
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Expires: 1994-03-26
Abstract
Abstract The shaft of a carburettor throttle is provided with a first return torsion spring one end of which abuts a lug of the carburettor body. A second return spring is stressed between the lug and the stationary end of the first spring. If the first spring fails, the second spring may exert a return force on the throttle which is almost as high as that of the first spring.
Inventors
- 👤 Francois Mennesson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:44
CPC Classifications
F; F02; F02M; F02M19/00; F02M19/12; F02M19/128; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20528; Y10T74/20534
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
203 words
In a carburettor for an internal combustion engine having a throttle member secured to a rotary shaft and adapted to be angularly moved with respect to the carburrettor body by control means, resilient return means for biasing said throttle member toward a minimum opening position, comprising: a first helical torsion return spring wound around the shaft and having a first end retained in fixed relation with respect to the carburettor body and its other end operatively connected to said shaft for exerting a return force on said shaft; a second helical torsion spring wound around the shaft and having a first end which is retained in fixed relation with respect to the carburettor body and its other end in abutting relation against said first end of the first spring which retains said second spring in stressed condition; a lever; and abutting means carried by said lever, said abutting means being non-rotatably connected to said throttle member and located on the path followed by said other end of the second spring when clear from abutment, whereby said second spring unwinds upon breakage of said first spring and exerts on said abutting means a force tending to move said throttle member toward its closed condition.
Claim 2
Dependent Claim
203 words
In a carburettor for an internal combustion engine having a throttle member secured to a rotary shaft and adapted to be angularly moved with respect to the carburrettor body by control means, resilient return means for biasing said throttle member toward a minimum opening position, comprising: a first helical torsion return spring wound around the shaft and having a first end retained in fixed relation with respect to the carburettor body and its other end operatively connected to said shaft for exerting a return force on said shaft; a second helical torsion spring wound around the shaft and having a first end which is retained in fixed relation with respect to the carburettor body and its other end in abutting relation against said first end of the first spring which retains said second spring in stressed condition; a lever; and abutting means carried by said lever, said abutting means being non-rotatably connected to said throttle member and located on the path followed by said other end of the second spring when clear from abutment, whereby said second spring unwinds upon breakage of said first spring and exerts on said abutting means a force tending to move said throttle member toward its closed condition.
Claim 3
Dependent Claim
81 words
A carburettor as set forth in claim 1, wherein the two torsion springs are wound on opposite sides of said lever which carries two pins substantially parallel with the shaft and turned towards the two springs respectively, and the carburettor body has a projecting lug acting as a bearing for the first ends of the two springs, one of the pins acting as a bearing for the second end of the first spring, and the other pin comprising said abutting 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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |