Patent US3759233A successfully refreshed from Google Patents.
US3759233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine cooling system
Assignee: Caterpillar Inc
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Filing: 1969-05-23
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Granted: 1973-09-18
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Expires: 1989-05-23
Abstract
Abstract A thermostat assembly having a hot coolant chamber, cold coolant chamber, and a mixing chamber. Heated coolant from the engine enters the hot coolant chamber, causing the thermostatic sensing unit to move a portion of the thermostat assembly so as to allow cold coolant to enter the cold coolant chamber. The heated coolant and the cold coolant both enter the mixing chamber and then pass to an expansion tank, through which they pass to the coolant pump in mixed form.
Inventors
- 👤 E Schlaffer
- 👤 S Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:34
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/02; F01P7/00; F01P7/14; F01P7/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
340 words
An engine coolant system comprising a thermostat assembly actuatable when the coolant reaches a predetermined temperature, first means transmitting coolant from the engine to the thermostat assembly, second means transmitting at least a portion of the coolant from the engine through a heat exchanger and then to the thermostat assembly when the assembly is actuated at the predetermined temperature, and third means in the thermostat assembly causing all of the coolant from the engine to pass through the heat exchanger prior to reaching the thermostat assembly when the assembly is actuated by the coolant temperature reaching a second predetermined temperature, said thermostat assembly having a hot coolant chamber for receiving coolant from the engine, a cold coolant chamber for receiving coolant from the heater exchanger, a mixing chamber for mixing the hot and cold coolant entering the assembly when the assembly is actuated by a coolant temperature between the first and second predetermined temperatures, and wherein said third means includes a movable member having at least one aperture therein allowing passage of coolant from said first means internally of said thermostat assembly to expansion tank means receiving the coolant passing through the thermostat assembly, said expansion tank means delivering the coolant to the intake side of an engine coolant pump, said thermostat assembly being directly mounted on the expansion tank, said expansion tank being situated, relative to the engine on a level at least as high as the upper-most coolanT level in the engine, said thermostat assembly including a thermostatic element located in said mixing chamber, said thermostatic element being connected to said movable member for movement thereof, and wherein said movable member is cup-shaped so as to define a generally cylindrical body having an open end and a closed end, said at least one aperture being in said closed end, said movable member being positioned so as to bring said closed end into sealing contact with a wall of the hot coolant chamber upon actuation by said thermostatic element and thereby close off said aperture in said closed end.
Claim 2
Dependent Claim
340 words
An engine coolant system comprising a thermostat assembly actuatable when the coolant reaches a predetermined temperature, first means transmitting coolant from the engine to the thermostat assembly, second means transmitting at least a portion of the coolant from the engine through a heat exchanger and then to the thermostat assembly when the assembly is actuated at the predetermined temperature, and third means in the thermostat assembly causing all of the coolant from the engine to pass through the heat exchanger prior to reaching the thermostat assembly when the assembly is actuated by the coolant temperature reaching a second predetermined temperature, said thermostat assembly having a hot coolant chamber for receiving coolant from the engine, a cold coolant chamber for receiving coolant from the heater exchanger, a mixing chamber for mixing the hot and cold coolant entering the assembly when the assembly is actuated by a coolant temperature between the first and second predetermined temperatures, and wherein said third means includes a movable member having at least one aperture therein allowing passage of coolant from said first means internally of said thermostat assembly to expansion tank means receiving the coolant passing through the thermostat assembly, said expansion tank means delivering the coolant to the intake side of an engine coolant pump, said thermostat assembly being directly mounted on the expansion tank, said expansion tank being situated, relative to the engine on a level at least as high as the upper-most coolanT level in the engine, said thermostat assembly including a thermostatic element located in said mixing chamber, said thermostatic element being connected to said movable member for movement thereof, and wherein said movable member is cup-shaped so as to define a generally cylindrical body having an open end and a closed end, said at least one aperture being in said closed end, said movable member being positioned so as to bring said closed end into sealing contact with a wall of the hot coolant chamber upon actuation by said thermostatic element and thereby close off said aperture in said closed end.
Claim 3
Dependent Claim
25 words
The thermostat assembly of claim 1 wherein said movable member has an additional plurality of apertures located within said member for passage of coolant therethrough.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |