Patent US4397157A successfully refreshed from Google Patents.
US4397157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for conditioning air of an internal space
Assignee: SURE AIR Ltd
•
Filing: 1980-05-19
•
Granted: 1983-08-09
•
Expires: 2000-05-19
Abstract
Abstract An internal space air conditioning system includes supply and return ducts communicating with the internal space, a blower circulating air through the ducts and space and a refrigeration unit having evaporator cooling coils located in the air path proximate the blower suction end. The return duct communicates with the ambient atmosphere by way of a louver type damper and thermostats are disposed in the internal space and the atmosphere, and are each actuated and deactuated respectively when the corresponding temperature exceeds and is below a preset value, the external set value being at least 10 degrees F. less than the internal set value. A control network is provided to fully close the damper, actuate the refrigeration unit and energize the blower when both thermostats are actuated, fully open the damper, deactuate the refrigeration unit and energize the blower when the internal and external thermostats are respectively actuated and deactuated and deactuate the refrigeration unit and de-energize the blower when the internal thermostat is deactuated. With an open damper and energized blower the ratio of return air to externally drawn air is about 1:1.
Inventors
- 👤 Deane R. Keuch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:31
CPC Classifications
F; F25; F25D; F25D16/00; F24; F24F; F24F5/00; F24F5/0007; F24F5/001; F25D1/00; F25D17/00; F25D17/04; F25D17/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
226 words
A system for air conditioning an internal space comprising a multiple outlet supply duct, a return duct, a blower for drawing air form said internal space through said return duct and recirculating said air through said supply duct to said internal space, an air conditioning unit transferable between an actuated and deactuated condition and including a cooling element located in the path of said circulating air through said ducts, means including a damper transferable between alternative fully open and fully closed positions providing communication between the ambient atmosphere and said return duct, a first thermostatic switch transferable alternatively on to a fully actuated or a fully deactuated condition in response only to the temperature in said internal space exceeding and being less than a first predetermined value respectively, a second thermostatic switch transferable alternatively only to a fully actuated or a fully deactuated condition in response only to the temperature of said ambient atmosphere exceeding and being less than a second predetermined value respectively and control means responsive only to the actuation of said first and second thermostatic switches for actuating said blower and air conditioning unit and fully closing said damper and responsive only to the actuation of said first thermostatic switch and the deactuation of said second thermostatic switch for deactuating said air conditioning unit and actuating said blower and fully opening said damper.
Claim 2
Independent Claim
226 words
A system for air conditioning an internal space comprising a multiple outlet supply duct, a return duct, a blower for drawing air form said internal space through said return duct and recirculating said air through said supply duct to said internal space, an air conditioning unit transferable between an actuated and deactuated condition and including a cooling element located in the path of said circulating air through said ducts, means including a damper transferable between alternative fully open and fully closed positions providing communication between the ambient atmosphere and said return duct, a first thermostatic switch transferable alternatively on to a fully actuated or a fully deactuated condition in response only to the temperature in said internal space exceeding and being less than a first predetermined value respectively, a second thermostatic switch transferable alternatively only to a fully actuated or a fully deactuated condition in response only to the temperature of said ambient atmosphere exceeding and being less than a second predetermined value respectively and control means responsive only to the actuation of said first and second thermostatic switches for actuating said blower and air conditioning unit and fully closing said damper and responsive only to the actuation of said first thermostatic switch and the deactuation of said second thermostatic switch for deactuating said air conditioning unit and actuating said blower and fully opening said damper.
Claim 3
Dependent Claim
20 words
The system of claim 1 wherein said air conditioning unit blower and damper are located externally of said internal space.
Claim 4
Dependent Claim
25 words
The system of claim 2 including a roof disposed above said internal space, said air conditioning unit, blower and damper being mounted on said roof.
Claim 5
Dependent Claim
67 words
The system of claim 1 wherein said control means is responsive only to the actuation of said second thermostatic switch and the deactuation of such first thermostatic switch for actuating said air conditioning unit and blower and fully closing said damper and is responsive only to the deactuation of said first and second thermostatic switches for deactuating said blower and air conditioning unit and closing said damper.
Claim 6
Dependent Claim
42 words
The system of claim 3 wherein said return duct has an inlet port formed therein communicating with said ambient atmosphere and said damper comprises a multiple louver gate in which the louvers are swingable between open open parallel positions and closed positions.
Claim 7
Dependent Claim
18 words
The system of claim 3 wherein said return duct is in continuous open communication with said internal space.
Claim 8
Dependent Claim
35 words
The system of claim 6 wherein the ratio of return air from said internal space and the air drawn from said ambient atmosphere during the open condition of said damper is between 1:1.5 and 1:0.5.
Claim 9
Dependent Claim
11 words
The system of claim 7 wherein said ratio is approximately 1:1.
Claim 10
Dependent Claim
14 words
The system of claim 5 wherein the louvers when in closed position are opposed.
References Cited (Backward Citations)
US2258021A
Cited
US2332730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |