Patent US3699871A successfully refreshed from Google Patents.
US3699871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supply air device for injection of preferably cold ventilation air
Assignee: Svenska Flaktfabriken AB
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Filing: 1971-02-26
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Granted: 1972-10-24
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Expires: 1991-02-26
Abstract
Abstract An air supply device adapted to be mounted adjacent one edge of a hung ceiling for injecting cold air from a duct extending parallel to the ceiling surface above the hung ceiling. The device consists of a pressure box having an air distribution chamber in its bottom formed between a pair of perforated plates which operate to distribute the air vertically downward and eliminate any horizontal component generated in the duct. To avoid the fouling of the ceiling surface surrounding the distribution chamber and the room wall adjacent the edge of the ceiling by the dirty secondary room air, air flow gaps are provided on three sides of the distribution chamber to inject air streams substantially parallel to the ceiling surface radiating outwardly from the distribution chamber, the outward flow deflecting the downwardly directed air by ejection and away from the room wall. Air flow regulating means are provided in each gap and in the distribution chamber to insure mixture of the air with secondary room air so as to avoid the draughts normally experienced from cold air inlet grilles.
Inventors
- 👤 Birger Larkfeldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:39
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/068
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
308 words
A device for supplying cold air into a room having an upright wall and a sub-ceiling surface with an opening adjacent said wall for receiving the air supply device, said device comprising a pressure box positioned above the plane of the ceiling surface and having a cold air duct connected thereto through one side thereof so as to introduce air into said pressure box from a direction parallel to the ceiling surface, said pressure box being mouNted in said opening in said ceiling and having a lower portion comprising an air distribution means for introducing cold air from said pressure box into the room, said air distribution means comprising a pair of vertically spaced perforated plates disposed parallel to the plane of the ceiling surface, and side walls surrounding said pair of plates and disposed intermediate said plates to define a distribution chamber below said pressure box which eliminates any lateral component of air flow from the air duct to thereby uniformly direct the air flow from said distribution chamber vertically downward into the room for mixture with the secondary room air, one of said side walls of said distribution chamber confronting said room wall being connected to the corresponding side of the pressure box to preclude air flow therebetween toward said wall, the opposite chamber side wall furthest from said room wall being spaced from the corresponding side of said pressure box to provide an air flow gap alongside said distribution chamber, individually adjustable upright vanes providing guiding surfaces in said gap for directing air flow from said pressure chamber outwardly from said air supply device substantially parallel to the ceiling surface of the room to provide an air veil to prevent flow of secondary room air along the ceiling surface alongside said device, and to deflect by ejection the downwardly directed flow from said distribution chamber.
Claim 2
Independent Claim
308 words
A device for supplying cold air into a room having an upright wall and a sub-ceiling surface with an opening adjacent said wall for receiving the air supply device, said device comprising a pressure box positioned above the plane of the ceiling surface and having a cold air duct connected thereto through one side thereof so as to introduce air into said pressure box from a direction parallel to the ceiling surface, said pressure box being mouNted in said opening in said ceiling and having a lower portion comprising an air distribution means for introducing cold air from said pressure box into the room, said air distribution means comprising a pair of vertically spaced perforated plates disposed parallel to the plane of the ceiling surface, and side walls surrounding said pair of plates and disposed intermediate said plates to define a distribution chamber below said pressure box which eliminates any lateral component of air flow from the air duct to thereby uniformly direct the air flow from said distribution chamber vertically downward into the room for mixture with the secondary room air, one of said side walls of said distribution chamber confronting said room wall being connected to the corresponding side of the pressure box to preclude air flow therebetween toward said wall, the opposite chamber side wall furthest from said room wall being spaced from the corresponding side of said pressure box to provide an air flow gap alongside said distribution chamber, individually adjustable upright vanes providing guiding surfaces in said gap for directing air flow from said pressure chamber outwardly from said air supply device substantially parallel to the ceiling surface of the room to provide an air veil to prevent flow of secondary room air along the ceiling surface alongside said device, and to deflect by ejection the downwardly directed flow from said distribution chamber.
Claim 3
Dependent Claim
38 words
An air supply device according to claim 1 wherein the perforation of the upper of said pair of plates provide an air flow area about one-fifth of the area of the perforations of the lower of said plates.
Claim 4
Dependent Claim
24 words
An air supply device according to claim 1 including means cooperable with the perforated plate to variably screen off the air flow openings therethrough.
Claim 5
Dependent Claim
75 words
An air supply device according to claim 1 wherein said pressure box between said opposite side walls of the distribution chamber has edge plates depending below the ceiling surface and confronting the corresponding side walls of said distribution box in spaced relation to cooperate with said side walls to provide side gaps to direct the air sideways from said pressure box at a level spaced below the ceiling surface immediately adjoining said air supply device.
Claim 6
Dependent Claim
29 words
An air supply device according to claim 4 including horizontal damper means in said side air gaps to control the force of the air discharged through said gaps selectively.
Claim 7
Dependent Claim
40 words
A device according to claim 5 wherein said opening is rectangular and said air gaps comprise three gaps disposed along the respective sides of the rectangular openings, said horizontal damper means including a separate flap valve in each side gap.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |