Patent US3760786A successfully refreshed from Google Patents.
US3760786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redundant throttle return system
Assignee: Colt Industries Operating Corp
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Filing: 1972-12-01
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Granted: 1973-09-25
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Expires: 1992-12-01
Abstract
Abstract A throttle valve, situated within the induction passage of a fuel or air induction device, is carried by a throttle shaft for fixed rotation therewith; a lever fixedly connected to the throttle shaft is operatively connected to a remotely situated operator''s foot-operated throttle control; a first throttle return spring is operatively connected to the first lever for returning the throttle valve to an idle position whenever the foot-operated throttle control is released; a second safety spring is provided for assuring the movement of the throttle valve to the idle position in the event that, for example, either the first throttle return spring or the associated throttle control linkage should fail while the throttle valve is in either a partly or fully opened position; and manually operated lever means is provided for at times operatively engaging the lever fixedly secured to the throttle shaft in order to thereby rotate the throttle valve toward an open position against the resistance of the safety spring.
Inventors
- 👤 K Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:14
CPC Classifications
F; F02; F02M; F02M19/00; F02M19/12; F02M19/128; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20213; Y10T74/2022; Y10T74/20226; Y10T74/20528; Y10T74/20534
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
Apparatus for assuring the return of a throttle valve from a partly opened or fully opened position to an idle position, comprising a shaft rotatably in accordance with the rotation of said throttle valve, first manually actuated throttle control linkage means operatively connected to said shaft for at times effecting rotation of said shaft and said throttle valve in a throttle opening direction, first spring means operatively connected to said shaft and said throttle valve for applying a resilient force thereagainst in a direction opposite to said throttle opening direction in order to at times rotate said shaft and said throttle valve to said idle position, second preloaded resilient means effective upon the occurrence of a failure in said first spring means for automatically causing said shaft and said throttle valve to be thereby resiliently rotated to said idle position, and latching means for preventing said second spring means from causing rotational motion of said first linkage means and said shaft during normal operation, said latching means comprising a class-1 lever system with latching portions situated on one side of the pivot of said class-1 lever and a resisting force generated by said first spring means applied to the other side of said pivot of said class-1 lever.
Claim 2
Dependent Claim
208 words
Apparatus for assuring the return of a throttle valve from a partly opened or fully opened position to an idle position, comprising a shaft rotatably in accordance with the rotation of said throttle valve, first manually actuated throttle control linkage means operatively connected to said shaft for at times effecting rotation of said shaft and said throttle valve in a throttle opening direction, first spring means operatively connected to said shaft and said throttle valve for applying a resilient force thereagainst in a direction opposite to said throttle opening direction in order to at times rotate said shaft and said throttle valve to said idle position, second preloaded resilient means effective upon the occurrence of a failure in said first spring means for automatically causing said shaft and said throttle valve to be thereby resiliently rotated to said idle position, and latching means for preventing said second spring means from causing rotational motion of said first linkage means and said shaft during normal operation, said latching means comprising a class-1 lever system with latching portions situated on one side of the pivot of said class-1 lever and a resisting force generated by said first spring means applied to the other side of said pivot of said class-1 lever.
Claim 3
Dependent Claim
54 words
Apparatus according to claim 1, including first lever means carried by said shaft for rotation therewith, wherein said first manufally actuated throttle control linkage means is connected to said shaft through said first lever means, and whereIn said second resilient means comprises second spring means pre-loaded and operatively connected to said first lever means.
Claim 4
Dependent Claim
93 words
Apparatus according to claim 1, including first lever means carried by said shaft for rotation therewith, wherein said first manually actuated throttle control linkage means is connected to said shaft through said first lever means, wherein said second resilient means comprises second spring means operatively connected to said first lever means and said shaft during normal operation, and wherein said latching portions are disengaged and effective upon failure of said first spring means to permit said second spring means to resiliently urge said first lever means and throttle valve to said idle position.
Claim 5
Dependent Claim
151 words
Apparatus according to claim 3, wherein said latching means comprises a second lever member freely rotatable about said shaft, a third lever member pivotally connected by first pivot means to said first lever means, a first latching surface formed on said second lever, a second latching surface formed on said third lever generally at one end thereof and adapted for cooperative engagement with said first latching surface, wherein said first spring means is operatively connected to said third lever at an end thereof opposite to said one end for urging and maintaining said first and second latching surfaces in cooperative engagement as long as said first spring means does not experience a failure, and wherein said second spring means operatively engages said first lever means and said second lever in a manner continually urging said first lever means and said second lever to experience relative rotation with respect to each other.
Claim 6
Dependent Claim
61 words
Apparatus according to claim 4, wherein the effective lever arm of the force applied by said first spring means to said third lever is in the order of 10 units, and wherein the effective lever arm of the force applied by said second spring means against said second latching surface on said third lever is in the order of 1.0 unit.
Claim 7
Dependent Claim
28 words
Apparatus according to claim 4, wherein said second spring means comprises a torsion spring, and wherein said torsion spring has one end engaged with said first pivot means.
Claim 8
Dependent Claim
52 words
Apparatus according to claim 6, wherein another end of said torsion spring is connected to said second lever at a point which is of a radial distance from the axis of said shaft less than the radial distance from the axis of said shaft at which said first latching surface is situated.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |