US4452391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air regulating device
Assignee: ELLSWORTH CHOW & MURPHY Inc A CORP OF
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Filing: 1981-11-20
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Granted: 1984-06-05
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Expires: 2001-11-20
Abstract
Abstract An automatic air regulating device for use in a forced air heating or cooling system whereby air vents or ducts leading to various rooms within a building may be automatically opened or closed to conserve energy. The automatic air regulating device of the present invention utilizes airfoil shaped dampers rotatable between open and closed positions within the building's air ducts. This airfoil shape thus provides for efficient and inexpensive operation of the dampers by utilizing the forced air flowing through the system for its operating forces. The dampers are further controlled by operation of restraining means which establish opening and closing conditions of the dampers in response to programmed or timed parameters set according to desired occupancy or use patterns within the building.
Inventors
- 👤 Vincent Y. S. Chow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:33
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1426; F24F2013/148
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
An air regulating device for use within an air duct of a forced air heating or cooling system, said regulating device comprising an airfoil shaped damper having a leading edge along one side thereof; means for pivotally mounting said damper within said air duct along an axis parallel to said leading edge; said damper rotatable about said mounting means between an open position, allowing for airflow through said air duct, and a closed position, substantially blocking airflow through said air duct; said damper shape and the placement thereof within said air duct urging said damper to rotate to its closed position when air is flowing through said air duct; restraining means made of a metallic strip attached to and selectively operable to prevent rotation of said damper and magnetizing means secured within said air duct selectively operable for magnetic engagement or disengagement with said metallic strip, whereby said damper is restrained from rotation when said magnetizing means is in magnetic engagement with said metallic strip and said damper is free to rotate when said magnetizing means is disengaged from said metallic strip.
Claim 2
Dependent Claim
182 words
An air regulating device for use within an air duct of a forced air heating or cooling system, said regulating device comprising an airfoil shaped damper having a leading edge along one side thereof; means for pivotally mounting said damper within said air duct along an axis parallel to said leading edge; said damper rotatable about said mounting means between an open position, allowing for airflow through said air duct, and a closed position, substantially blocking airflow through said air duct; said damper shape and the placement thereof within said air duct urging said damper to rotate to its closed position when air is flowing through said air duct; restraining means made of a metallic strip attached to and selectively operable to prevent rotation of said damper and magnetizing means secured within said air duct selectively operable for magnetic engagement or disengagement with said metallic strip, whereby said damper is restrained from rotation when said magnetizing means is in magnetic engagement with said metallic strip and said damper is free to rotate when said magnetizing means is disengaged from said metallic strip.
Claim 3
Dependent Claim
56 words
An air regulating device as claimed in claim 1 wherein said magnetizing means comprises a permanent magnet attached to an electrically operable solenoid whereby said magnet is movable between a first position extending toward and in magnetic engagement with said metallic strip and a second position distant from and in magnetic disengagement with said metallic strip.
Claim 4
Dependent Claim
248 words
An air regulating device for use with a forced air heating or cooling system, having an elongated air duct and a fan creating air flow therethrough upon operation of said fan, said regulating device comprising: a damper having a leading edge along one side thereof and a trailing edge along the oposite side thereof; means for pivotally mounting said damper within said air duct along an axis parallel to said leading edge; said damper rotatable about said mounting means between an open position, having the plane between said leading edge and said trailing edge substantially parallel to said air duct, and a closed position, having said plane substantially perpendicular to said airduct; means urging said damper to its open position when the fan is not operating and no airflow is passing through said duct; said damper formed in the shape of an airfoil to establish lift forces thereon perpendicular to said plane when airflow passes thereover and whereby said lift forces urge said damper to its closed position when the fan is operating and airflow is passing through said duct; restraining means made of a metallic strip attached to said damper and selectively operable to hold said damper in its open position against the urging of said lift forces; and magnetizing means secured within said air duct selectively operable for magnetic engagement or disengagement with said metallic strip whereby said damper is held in its open position upon magnetic engagement between said metallic strip and said magnetizing means.
Claim 5
Dependent Claim
248 words
An air regulating device for use with a forced air heating or cooling system, having an elongated air duct and a fan creating air flow therethrough upon operation of said fan, said regulating device comprising: a damper having a leading edge along one side thereof and a trailing edge along the oposite side thereof; means for pivotally mounting said damper within said air duct along an axis parallel to said leading edge; said damper rotatable about said mounting means between an open position, having the plane between said leading edge and said trailing edge substantially parallel to said air duct, and a closed position, having said plane substantially perpendicular to said airduct; means urging said damper to its open position when the fan is not operating and no airflow is passing through said duct; said damper formed in the shape of an airfoil to establish lift forces thereon perpendicular to said plane when airflow passes thereover and whereby said lift forces urge said damper to its closed position when the fan is operating and airflow is passing through said duct; restraining means made of a metallic strip attached to said damper and selectively operable to hold said damper in its open position against the urging of said lift forces; and magnetizing means secured within said air duct selectively operable for magnetic engagement or disengagement with said metallic strip whereby said damper is held in its open position upon magnetic engagement between said metallic strip and said magnetizing means.
Claim 6
Dependent Claim
56 words
An air regulating device as claimed in claim 3 wherein said magnetizing means comprises a permanent magnet attached to an electrically operable solenoid whereby said magnet is movable between a first position extending toward and in magnetic engagement with said metallic strip and a second position distant from and in magnetic disengagement with said metallic strip.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |