Patent US3807709A successfully refreshed from Google Patents.
US3807709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor
Assignee: Denso Corp
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Filing: 1971-09-21
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Granted: 1974-04-30
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Expires: 1991-09-21
Abstract
Abstract A carburetor so constructed that a portion of a temperature detector which is displaced by a temperature change of an engine is mechanically connected to a fast idle cam by means of a cable to control the degree of opening of a choke valve by said cam and further the displacement of said fast idle cam is transmitted to a throttle valve through a link work, whereby the degree of opening of the throttle valve is automatically controlled according to the degree of opening of the choke valve without actuating an accelerator pedal.
Inventors
- 👤 T Suda
- 👤 H Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:27
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/08; F02M1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
314 words
In an engine a carburetor having choke and throttle valves comprising a first lever fixed to a shaft to which said choke valve is affixed, said lever being rotatable to operate said choke valve in accordance with the operation of said throttle valve when said engine is cold, a fast idle cam rotatably mounted on said shaft, said cam having a cam bearing surface, and said cam being adapted to rotate in accordance with the temperature of said engine to operate said throttle valve, a spring extending between said fast idle cam and the housing of said carburetor, said spring providing a choke valve opening and throttle valve closing force when the engine temperature rises, a torsion spring disposed between said lever and said fast idle cam and connecting said lever and said fast idle cam to one another, a second lever engaging said first lever and said fast idle cam, a third lever fixedly secured to said second lever, said second lever having a lug portion which rotates said first lever to open said choke valve as said throttle valve opens when said engine is cold, a rod disposed between said third lever and a fourth lever fixed to said throttle valve for interlocking said second lever with said throttle valve, a temperature detector having a volume which changes according to engine temperature, said temperature detector including a pin which moves with respect to the housing of said detector in accordance with the temperature of said engine and a cable disposed between said temperature detector and said fast idle cam to transmit the displacement of said pin of said temperature detector to said fast idle cam, said cable enabling the housing of said carburetor and said temperature detector to be independent of each other and enabling said temperature detector to be disposed at any location where it is possible to detect engine temperature.
Claim 2
Dependent Claim
314 words
In an engine a carburetor having choke and throttle valves comprising a first lever fixed to a shaft to which said choke valve is affixed, said lever being rotatable to operate said choke valve in accordance with the operation of said throttle valve when said engine is cold, a fast idle cam rotatably mounted on said shaft, said cam having a cam bearing surface, and said cam being adapted to rotate in accordance with the temperature of said engine to operate said throttle valve, a spring extending between said fast idle cam and the housing of said carburetor, said spring providing a choke valve opening and throttle valve closing force when the engine temperature rises, a torsion spring disposed between said lever and said fast idle cam and connecting said lever and said fast idle cam to one another, a second lever engaging said first lever and said fast idle cam, a third lever fixedly secured to said second lever, said second lever having a lug portion which rotates said first lever to open said choke valve as said throttle valve opens when said engine is cold, a rod disposed between said third lever and a fourth lever fixed to said throttle valve for interlocking said second lever with said throttle valve, a temperature detector having a volume which changes according to engine temperature, said temperature detector including a pin which moves with respect to the housing of said detector in accordance with the temperature of said engine and a cable disposed between said temperature detector and said fast idle cam to transmit the displacement of said pin of said temperature detector to said fast idle cam, said cable enabling the housing of said carburetor and said temperature detector to be independent of each other and enabling said temperature detector to be disposed at any location where it is possible to detect engine temperature.
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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |