US3785166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Room air conditioner frost protection with bimetal control thermostat
Assignee: General Electric Co
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Filing: 1972-07-10
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Granted: 1974-01-15
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Expires: 1992-07-10
Abstract
Abstract A room air conditioner comprising a refrigeration system including an evaporator, air circulating means, and a control thermostat is provided with a conduit for directing room air over the thermostat, the conduit being heat exchanged with the evaporator so that a frosting temperature of the evaporator prevents energization of the refrigeration system by the thermostat.
Inventors
- 👤 P Schrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:48
CPC Classifications
F; F24; F24F; F24F5/00; F24F5/0007; F24F5/001
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
177 words
An air conditioning unit for conditioning air from an enclosure comprising: an air flow passage having an inlet and an outlet communicating with said enclosure; a refrigeration system including an evaporator, said evaporator being disposed in said passage; air circulating means disposed in said passage between said inlet and said evaporator for circulating enclosure air through said evaporator; a thermostat including temperature sensing means for controlling operation of said refrigeration system, said thermostat being mounted outside said air flow passage; a metal tube having an inlet end disposed in said passage upstream from said evaporator for receiving a portion of the high pressure air flowing from said air circulating means to said evaporator and conducting said air portion over said temperature sensing means; a section of said tube ahead of said temperature sensing means being in heat exchange contact with said evaporator whereby the air passing through said tube is cooled by said evaporator; said heat exchange being sufficient to prevent said thermostat from operating said system when the temperature of said evaporator is below frosting temperatures.
Claim 2
Dependent Claim
177 words
An air conditioning unit for conditioning air from an enclosure comprising: an air flow passage having an inlet and an outlet communicating with said enclosure; a refrigeration system including an evaporator, said evaporator being disposed in said passage; air circulating means disposed in said passage between said inlet and said evaporator for circulating enclosure air through said evaporator; a thermostat including temperature sensing means for controlling operation of said refrigeration system, said thermostat being mounted outside said air flow passage; a metal tube having an inlet end disposed in said passage upstream from said evaporator for receiving a portion of the high pressure air flowing from said air circulating means to said evaporator and conducting said air portion over said temperature sensing means; a section of said tube ahead of said temperature sensing means being in heat exchange contact with said evaporator whereby the air passing through said tube is cooled by said evaporator; said heat exchange being sufficient to prevent said thermostat from operating said system when the temperature of said evaporator is below frosting temperatures.
Claim 3
Dependent Claim
16 words
An air conditioNing unit according to claim 1 in which said thermostat is a bimetal thermostat.
Claim 4
Dependent Claim
184 words
An air conditioning unit for conditioning air from an enclosure comprising: means defining an air flow passage having an inlet and an outlet communicating with said enclosure and including an evaporator plenum; a refrigeration system including an evaporator disposed in said plenum; air circulating means disposed adjacent said inlet and upstream from said evaporator for withdrawing enclosure air and discharging the air into said plenum; a thermostat including temperature sensing means for controlling operation of said refrigeration system mounted on said unit adjacent and separate from said evaporator plenum; a metal tubular member having an inlet end disposed in said plenum between said air circulating means and said evaporator for receiving a portion of the air flowing from said air circulating means to said evaporator and an outlet end for directing said air portion over said temperature sensing means; a section of said tubular member being in heat exchange contact with said evaporator whereby the air passing through said tubular member is normally cooled by said evaporator; said heat exchange being sufficient to prevent operation of said refrigeration system during frosting of said evaporator.
Claim 5
Dependent Claim
184 words
An air conditioning unit for conditioning air from an enclosure comprising: means defining an air flow passage having an inlet and an outlet communicating with said enclosure and including an evaporator plenum; a refrigeration system including an evaporator disposed in said plenum; air circulating means disposed adjacent said inlet and upstream from said evaporator for withdrawing enclosure air and discharging the air into said plenum; a thermostat including temperature sensing means for controlling operation of said refrigeration system mounted on said unit adjacent and separate from said evaporator plenum; a metal tubular member having an inlet end disposed in said plenum between said air circulating means and said evaporator for receiving a portion of the air flowing from said air circulating means to said evaporator and an outlet end for directing said air portion over said temperature sensing means; a section of said tubular member being in heat exchange contact with said evaporator whereby the air passing through said tubular member is normally cooled by said evaporator; said heat exchange being sufficient to prevent operation of said refrigeration system during frosting of said evaporator.
Claim 6
Dependent Claim
19 words
An air conditioning unit according to claim 3 in which the inlet end of said tubular member slants downwardly.
Claim 7
Dependent Claim
24 words
An air conditioning unit according to claim 4 in which said thermostat is a bimetal thermostat disposed in a control chamber adjacent said plenum.
Claim 8
Dependent Claim
15 words
An air conditioning unit according to claim 4 in which said tubular member is aluminum.
Claim 9
Dependent Claim
20 words
An air conditioning unit according to claim 6 in which said evaporator portion extends across the top of said plenum.
References Cited (Backward Citations)
US3640087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |