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US3828745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic choke control for engines
Assignee: Ford Motor Co
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Filing: 1972-12-26
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Granted: 1974-08-13
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Expires: 1992-12-26
Abstract
Abstract An automatic choke control for a carburetor of an internal combustion engine having a loosely coiled bi-metallic thermostatic spring generally centered in a cylindrical housing means. One end of the spring is anchored in the housing means and the other end is operatively connected with a movable choke valve pivotally mounted in the air-fuel induction passage of a carburetor. Means are provided for passing a stream of heated air over the thermostatic spring and this means includes an air induction passage in the cylindrical housing means extending generally tangentially with respect to the housing and with respect to the coils of the thermostatic spring and an air exhaust passage located generally centrally of the housing. This structure forms a vortex of heated air in heat transfer relationship to the thermostatic spring.
Inventors
- 👤 J Medrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:06
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/08; F02M1/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
An automatic choke control for use with a carburetor having an air-fuel induction passage and a choke valve pivotally mounted across the passage, said automatic choke control comprising a housing having a generally cylindrical side wall mounted on said carburetor, a coiled thermostatic spring positioned in said housing, one end of said spring being anchored in said housing, means operatively coupling the other end of said thermostatic spring with said choke valve for positioning said choke valve in response to the temperature of said thermostatic spring, means coupled to said housing for injecting a stream of heated air into said housing in a direction generally tangential with respect to said generally cylindrical side wall of said housing, said housing having an exhaust passage positioned therein approximately on the axis of said generally cylindrical side wall whereby a vortex is formed in heat transfer relationship to said thermostatic spring.
Claim 2
Dependent Claim
148 words
An automatic choke control for use with a carburetor having an air-fuel induction passage and a choke valve pivotally mounted across the passage, said automatic choke control comprising a housing having a generally cylindrical side wall mounted on said carburetor, a coiled thermostatic spring positioned in said housing, one end of said spring being anchored in said housing, means operatively coupling the other end of said thermostatic spring with said choke valve for positioning said choke valve in response to the temperature of said thermostatic spring, means coupled to said housing for injecting a stream of heated air into said housing in a direction generally tangential with respect to said generally cylindrical side wall of said housing, said housing having an exhaust passage positioned therein approximately on the axis of said generally cylindrical side wall whereby a vortex is formed in heat transfer relationship to said thermostatic spring.
Claim 3
Dependent Claim
59 words
The combination of claim 1 in which said thermostatic spring is formed in a loose coil, said first mentioned end of said thermostatic spring is anchored approximately on the axis of said generally cylindrical side wall of said housing adjacent said exhaust passage and said other end of said thermostatic spring is positioned radially outwardly of said first end.
Claim 4
Dependent Claim
54 words
The combination of claim 2 in which said means for injecting a stream of heated air into said housing in a direction generally tangential with respect to said generally cylindrical side wall is positioned to inject said stream of heated air in a direction opposite to that in which said thermostatic spring is coiled.
Claim 5
Dependent Claim
29 words
The combination of claim 1 and further comprising an intake manifold, the carburetor being mounted on said intake manifold and means connecting said exhaust passage to said intake manifold.
Claim 6
Dependent Claim
29 words
The combination of claim 1 in which said means coupled to said housing for injecting a stream of heated gas into said housing comprises an exhaust manifold heat stove.
Claim 7
Dependent Claim
195 words
An automatic choke control mechanism for use with an internal combustion Engine, the combination comprising a carburetor having an air induction passage, a choke valve pivotally mounted in said air induction passage, a housing mounted on said carburetor, a thermostatic spring positioned in said housing, one end of said spring fixed in said housing, means operatively coupling the other end of said thermostatic spring with said choke valve for positioning said choke valve in response to the temperature of said thermostatic spring, and means coupled to said housing for providing a vortex of heated air in said housing in heat transfer relationship to said thermostatic spring, said thermostatic spring being formed in a loose coil with the axis of the coil being positioned generally coincident with the axis of said vortex of heated air, said housing having a generally cylindrical side wall and an end wall, and said means for providing a vortex of heated air comprising an opening in said end wall positioned approximately on the axis of the coil of said thermostatic spring and means for injecting heated air into said housing in a direction substantially tangential to said generally cylindrical side wall.
Claim 8
Dependent Claim
195 words
An automatic choke control mechanism for use with an internal combustion Engine, the combination comprising a carburetor having an air induction passage, a choke valve pivotally mounted in said air induction passage, a housing mounted on said carburetor, a thermostatic spring positioned in said housing, one end of said spring fixed in said housing, means operatively coupling the other end of said thermostatic spring with said choke valve for positioning said choke valve in response to the temperature of said thermostatic spring, and means coupled to said housing for providing a vortex of heated air in said housing in heat transfer relationship to said thermostatic spring, said thermostatic spring being formed in a loose coil with the axis of the coil being positioned generally coincident with the axis of said vortex of heated air, said housing having a generally cylindrical side wall and an end wall, and said means for providing a vortex of heated air comprising an opening in said end wall positioned approximately on the axis of the coil of said thermostatic spring and means for injecting heated air into said housing in a direction substantially tangential to said generally cylindrical side wall.
Claim 9
Dependent Claim
40 words
The combination of claim 6 in which the internal combustion engine includes an intake manifold connected to the air induction passage, and means are provided for connecting said opening in said end wall of said housing with said intake manifold.
Claim 10
Dependent Claim
49 words
The combination of claim 7 in which the internal combustion engine is provided with an exhaust manifold heat stove and said means for injecting heated air into said housing comprises a passage connected to said exhaust manifold heat stove and to said generally cylindrical side wall of said housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |