Patent US3868935A successfully refreshed from Google Patents.
US3868935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic choke
Assignee: Motors Liquidation Co
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Filing: 1973-12-14
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Granted: 1975-03-04
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Expires: 1993-12-14
Abstract
Abstract In a preferred embodiment in a one-barrel carburetor having a choke valve, a throttle, a fast idle cam for controlling the idling speed, and a thermostat responsive to engine temperature, the improvement comprises a pair of connecting links extending from a lever connected to the thermostat to a pair of levers on the choke shaft. The first link extends to a lever secured to the choke shaft, and permits the choke valve to blow open during the first half of the thermostat travel. The second link extends to a cam lever pivoted on the choke shaft and linked to the fast idle cam, and permits delayed fast idle cam come-off during additional thermostat travel.
Inventors
- 👤 Bernard Liebman
- 👤 David W Rucinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:26
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/08; F02M1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
314 words
For use in an internal combustion engine, a carburetor comprising an air intake, a throttle rotatably disposed in said air intake for controlling air flow to the engine, a throttle lever secured to said throttle for concomitant rotation through a selected path, a cam disposed in said path for variably limiting the rotation of said throttle lever in a throttle closing direction and thus controlling the idling position of the throttle valve, a choke shaft rotatably disposed in said air inlet anterior said throttle, a choke valve secured to said choke shaft, a choke lever secured to said choke shaft, a cam lever having an arcuate slot and rotatably disposed about said choke shaft, a cam link operatively connecting said cam lever and said cam, and positioning means responsive to temperature and including a housing, a thermostat shaft rotatably disposed in and extending through said housing, a bimetallic coil enclosed within said housing and having one end anchored to the housing and further having the other end positioning said thermostat shaft, a thermostat lever secured at one end to said thermostat shaft outside said housing and having an arcuate slot adjacent the opposite end, a first link extending from said slot in said thermostat lever to said choke lever for limiting the opening of said choke valve, and a second link extending from the middle of said thermostat lever to said slot in said cam lever; whereby as the temperature responsive positioning means warms, said coil permits said thermostat lever, said first link, and said choke lever to allow said choke valve to blow open, whereby as said thermostat lever moves, said second link, said cam lever, said cam link and said cam move under their own weight to allow said throttle lever to close said throttle, and whereby said choke valve is permitted to open before said cam is permitted to come off.
Claim 2
Dependent Claim
314 words
For use in an internal combustion engine, a carburetor comprising an air intake, a throttle rotatably disposed in said air intake for controlling air flow to the engine, a throttle lever secured to said throttle for concomitant rotation through a selected path, a cam disposed in said path for variably limiting the rotation of said throttle lever in a throttle closing direction and thus controlling the idling position of the throttle valve, a choke shaft rotatably disposed in said air inlet anterior said throttle, a choke valve secured to said choke shaft, a choke lever secured to said choke shaft, a cam lever having an arcuate slot and rotatably disposed about said choke shaft, a cam link operatively connecting said cam lever and said cam, and positioning means responsive to temperature and including a housing, a thermostat shaft rotatably disposed in and extending through said housing, a bimetallic coil enclosed within said housing and having one end anchored to the housing and further having the other end positioning said thermostat shaft, a thermostat lever secured at one end to said thermostat shaft outside said housing and having an arcuate slot adjacent the opposite end, a first link extending from said slot in said thermostat lever to said choke lever for limiting the opening of said choke valve, and a second link extending from the middle of said thermostat lever to said slot in said cam lever; whereby as the temperature responsive positioning means warms, said coil permits said thermostat lever, said first link, and said choke lever to allow said choke valve to blow open, whereby as said thermostat lever moves, said second link, said cam lever, said cam link and said cam move under their own weight to allow said throttle lever to close said throttle, and whereby said choke valve is permitted to open before said cam is permitted to come off.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |