US3789812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air/fuel mixing system controlled by temperature activated mechanism for internal combustion engines
Assignee: COLSPAN ENVIRONMENTAL SYST Inc
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Filing: 1973-04-10
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Granted: 1974-02-05
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Expires: 1993-04-10
Abstract
Abstract An improvement in air/fuel mixing systems controlled by temperature activated mechanism for internal combustion engines, embodied in air/fuel mixing means which permit the carburetor to be initially adjusted for efficient economical performance to maintain a variable nearly perfect air/fuel mixture for combustion under a wide range of operating conditions by varying the pressure in the float bowl of the carburetor, achieved by connecting a vacuum source to the carburetor float bowl by a vacuum conduit whereby the difference between the pressure in the fuel bowl and the pressure in the Venturi throat of the carburetor is reduced. The temperature activated mechanism is incorporated into the mixing system and provides an automatic over-temperature safety cutout device which is a thermal vacuum valve that simultaneously disables the main air/fuel mixing system and enables the distributor advance upon sensing an overtemperature condition.
Inventors
- 👤 J Berry
- 👤 W Womack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:18
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/10; F02M7/11; Y; Y10; Y10S; Y10S261/00; Y10S261/67
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
An air/fuel mixing system controlled by temperature activated mechanism for internal combustion engines comprising a a carburetor and a main vacuum conduit connecting a vacuum source to the carburetor fuel chamber for varying the pressure in the chamber and thereby automatically varying the flow of fuel from the chamber to the intake manifold of an engine, b a distributor advance line connected to the vacuum source, and c an automatic over-temperature safety cutout device mounted to sense the temperature of cooling water in the top radiator hose of an engine, and simultaneously disables the air/fuel mixing system and enables the distributor advance upon sensing an over-temperature condition.
Claim 2
Dependent Claim
107 words
An air/fuel mixing system controlled by temperature activated mechanism for internal combustion engines comprising a a carburetor and a main vacuum conduit connecting a vacuum source to the carburetor fuel chamber for varying the pressure in the chamber and thereby automatically varying the flow of fuel from the chamber to the intake manifold of an engine, b a distributor advance line connected to the vacuum source, and c an automatic over-temperature safety cutout device mounted to sense the temperature of cooling water in the top radiator hose of an engine, and simultaneously disables the air/fuel mixing system and enables the distributor advance upon sensing an over-temperature condition.
Claim 3
Dependent Claim
60 words
The system defined by claim 1, in which the safety cutout device comprises a normally open valve in the main vacuum conduit, a normally closed valve in the distributor advance line, and a temperature sensing unit connected to said valves and automatically opening said normally closed valve and automatically closing said normally open valve when an over-temperature condition is sensed.
Claim 4
Dependent Claim
70 words
The system defined by claim 1, which includes a mixing valve unit connected into the main vacuum conduit of the system, that controls the air/fuel mixture of the engine by applying variable partial vacuum to the carburetor float bowl under varying conditions of engine speed, load and altitude, and by providing additional dilution of the air/fuel mixture through a controlled orifice vent control valve assembly in the main vacuum conduit.
Claim 5
Dependent Claim
45 words
The system defined by claim 3, in which said orifice vent control valve assembly comprises a mixing chamber in the main vacuum conduit, a flow limiting orifice and a vent control valve, the critical flow through the orifice being substantially below the normal operational flow.
Claim 6
Dependent Claim
70 words
The system defined by claim 2, which includes a mixing valve unit connected into the main vacuum conduit of the system, that controls the air/fuel mixture of the engine by applying variable partial vacuum to the carburetor float bowl under varying conditions of engine speed, load and altitude, And by providing additional dilution of the air/fuel mixture through a controlled orifice vent control valve assembly in the main vacuum conduit.
Claim 7
Dependent Claim
192 words
An air/fuel mixing system controlled by temperature activated mechanism for internal combustion engines, comprising a a carburetor including a fuel chamber, a body having an air intake and a Venturi throat, an orificed fuel nozzle in the throat and means connecting the carburetor body to the intake manifold of an engine, b a vacuum source, c a main vacuum conduit connecting the vacuum source to the carburetor fuel chamber for varying the pressure in the chamber and thereby automatically varying the flow of fuel from the chamber to the orificed nozzle in the throat, d a normally open valve in said main vacuum conduit, e a vacuum distributor advance line connected to the vacuum source and having a normally closed valve in said vacuum advance line, and f a temperature sensing and control unit mounted to sense the temperature of cooling water in the top radiator hose of the engine, and connected to said normally open valve in said main vacuum conduit and to said normally closed valve in said vacuum advance line, whereby sensing of an over-temperature condition automatically disables the main air/fuel mixing system and enables the distributor advance line.
Claim 8
Dependent Claim
192 words
An air/fuel mixing system controlled by temperature activated mechanism for internal combustion engines, comprising a a carburetor including a fuel chamber, a body having an air intake and a Venturi throat, an orificed fuel nozzle in the throat and means connecting the carburetor body to the intake manifold of an engine, b a vacuum source, c a main vacuum conduit connecting the vacuum source to the carburetor fuel chamber for varying the pressure in the chamber and thereby automatically varying the flow of fuel from the chamber to the orificed nozzle in the throat, d a normally open valve in said main vacuum conduit, e a vacuum distributor advance line connected to the vacuum source and having a normally closed valve in said vacuum advance line, and f a temperature sensing and control unit mounted to sense the temperature of cooling water in the top radiator hose of the engine, and connected to said normally open valve in said main vacuum conduit and to said normally closed valve in said vacuum advance line, whereby sensing of an over-temperature condition automatically disables the main air/fuel mixing system and enables the distributor advance line.
Claim 9
Dependent Claim
36 words
The system defined by claim 6, which includes a feedback line having one end inserted into the open top of the venturi throat of the carburetor and the other end connected to the main vacuum conduit.
References Cited (Backward Citations)
US1041662A
Cited
US3080858A
Cited
US3301242A
Cited
US3400698A
Cited
US3677241A
Cited
US3742924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |