US3800767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermo switch arrangement for control of an internal combustion engine
Assignee: Carter Automotive Co Inc
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Filing: 1972-04-20
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Granted: 1974-04-02
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Expires: 1992-04-20
Abstract
Abstract A dual switch is mounted in the wall of the water jacket of the engine so that one thermo switch responds to the engine heat and the other thermo switch responds to the ambient temperature. The switches are connected in series with a source of current and a heater in proximity to an expansible coil controlling the choke valve. The coil is adjacent a water jacket so that it is affected by engine heat. The engine heat responsive thermo switch remains closed until the engine temperature approaches a near-normal value. At low temperatures, the ambient switch is open, and it closes only after the choke is opened following a warm-up period. During cooling of the engine, the ambient switch remains closed down to a relatively low temperature, so that if the engine is ''''soaked,'''' the heater will be energized for quick opening of the choke, to relieve the ''''soak'''' condition. Another dual thermo switch may be similarly mounted in the wall of the water jacket and connected in a circuit for controlling the ignition advance means of the distributor.
Inventors
- 👤 J Winkley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:08
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/08; F02M1/10; F02M1/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
168 words
Apparatus for controlling an internal combustion engine including a carburetor having a control device for opening and closing the carburetor choke valve in response to engine temperature, comprising a circuit including an electric auxiliary heater in proximity to said control devIce, said circuit including a source of current and a dual switch device, said switch device having an elongated casing and means for mounting said casing in a wall of a container subjected to the heat of the engine so that one end of said casing is within said container and the other end of said casing is outside said container, a pair of series connected temperature responsive switches located at opposite ends of said casing, so that one of said switches is opened by engine temperatures above a given level and the other switch is closed by ambient temperatures above a given level, whereby said auxiliary heater is energized to enable the control device to open the choke valve in response to predetermined ambient and engine temperatures.
Claim 2
Dependent Claim
168 words
Apparatus for controlling an internal combustion engine including a carburetor having a control device for opening and closing the carburetor choke valve in response to engine temperature, comprising a circuit including an electric auxiliary heater in proximity to said control devIce, said circuit including a source of current and a dual switch device, said switch device having an elongated casing and means for mounting said casing in a wall of a container subjected to the heat of the engine so that one end of said casing is within said container and the other end of said casing is outside said container, a pair of series connected temperature responsive switches located at opposite ends of said casing, so that one of said switches is opened by engine temperatures above a given level and the other switch is closed by ambient temperatures above a given level, whereby said auxiliary heater is energized to enable the control device to open the choke valve in response to predetermined ambient and engine temperatures.
Claim 3
Dependent Claim
19 words
Apparatus according to claim 1, wherein each switch includes a bimetallic member constituting the movable contact of the switch.
Claim 4
Dependent Claim
16 words
Apparatus according to claim 2 wherein said bimetallic members are in the form of arched discs.
Claim 5
Dependent Claim
166 words
Apparatus according to claim 1 wherein said engine has a distributor having spark advance and retard means, comprising a circuit including a source of current and switch means connected in series with a solenoid for actuating said spark advance and retard means, said switch means having an elongated casing and means for mounting said casing in a wall on a container subjected to the heat of the engine, so that one end of said casing is within said container and the other end of said casing is outside said container, said switch means further including a pair of parallel connected temperature responsive switches located at opposite ends of said casing so that one of said switches is opened by ambient temperatures above a given level to retard the spark and the other switch is closed by engine temperatures above another level to advance the spark, and thereby reduce engine overheating, said first switch being closed by ambient temperatures below a given level to advance the spark.
Claim 6
Dependent Claim
162 words
A carburetor having an automatic choke valve operated by an engine heated control device, comprising a circuit including an electric auxiliary heater in proximity to said control device, said circuit including a source of current and a dual switch device, said switch device having an elongated insulated casing and means for mounting said casing in a wall of the water jacket of the engine so that one end of said casing is within the water jacket and the other end of said casing is outside of the water jacket, a pair of series connected bimetallic temperature responsive switches located at opposite ends of said casing, so that when the engine is cut off, one of said switches is closed when the engine temperature falls below a given level, and the other switch remains closed at ambient temperatures above a given level, whereby said auxiliary heater is energized to cause the control device to accelerate opening of the choke valve during engine restarting.
Claim 7
Dependent Claim
162 words
A carburetor having an automatic choke valve operated by an engine heated control device, comprising a circuit including an electric auxiliary heater in proximity to said control device, said circuit including a source of current and a dual switch device, said switch device having an elongated insulated casing and means for mounting said casing in a wall of the water jacket of the engine so that one end of said casing is within the water jacket and the other end of said casing is outside of the water jacket, a pair of series connected bimetallic temperature responsive switches located at opposite ends of said casing, so that when the engine is cut off, one of said switches is closed when the engine temperature falls below a given level, and the other switch remains closed at ambient temperatures above a given level, whereby said auxiliary heater is energized to cause the control device to accelerate opening of the choke valve during engine restarting.
Claim 8
Dependent Claim
191 words
An internal combustion engine including a control device for controlling the operation of the engine in response to ambient and engine temperatures comprising a circuit including an electric actuator for said control device, said circuit further including a source of current and a dual switch device, said switch device having an elongated insulated casing and means for mounting said casing in a wall of a container subjected to the heat of the engine so that one end of said casing is within said container and the other end of said casing is outside said container, a pair of interconnected bimetallic temperature responsive switches located at opposite ends of said casing, so that one of said switches is operated by engine temperatures and the other switch is operated by ambient temperatures for energizing said actuator in response to predetermined ambient and engine temperatures, said control device including a carburetor choke valve and a means for controlling the opening and closing thereof, said actuator being an electric heater adjacent to said last mentioned meAns so that energizing said heater actuates said means for controlling so as to tend to open said choke valve.
Claim 9
Dependent Claim
191 words
An internal combustion engine including a control device for controlling the operation of the engine in response to ambient and engine temperatures comprising a circuit including an electric actuator for said control device, said circuit further including a source of current and a dual switch device, said switch device having an elongated insulated casing and means for mounting said casing in a wall of a container subjected to the heat of the engine so that one end of said casing is within said container and the other end of said casing is outside said container, a pair of interconnected bimetallic temperature responsive switches located at opposite ends of said casing, so that one of said switches is operated by engine temperatures and the other switch is operated by ambient temperatures for energizing said actuator in response to predetermined ambient and engine temperatures, said control device including a carburetor choke valve and a means for controlling the opening and closing thereof, said actuator being an electric heater adjacent to said last mentioned meAns so that energizing said heater actuates said means for controlling so as to tend to open said choke valve.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |