Patent US3749115A successfully refreshed from Google Patents.
US3749115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper apparatus with fluid seal
Assignee: Combustion Engineering Inc
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Filing: 1971-12-29
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Granted: 1973-07-31
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Expires: 1991-12-29
Abstract
Abstract Dampers operative in a duct system are provided with a hollow body that is connected to a source of fluid maintained at a higher pressure than that of the gases passed through the duct. Means are provided along the edges of the dampers to contain sealing fluid admitted thereto when the dampers are disposed in a fully closed position thus to provide a fluid seal that is effective to prevent passage of the gases conducted through the duct from one side of the dampers to the other.
Inventors
- 👤 G Raftis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:40
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1406; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F24F13/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
In a duct system for conducting fluids, the combination comprising: a. a frame defining an opening for the passage of fluids therethrough; b. a plurality of hollow damper bodies journaled for pivotal movement in said frame between an open and a closed position; C. said damper bodies in said closed position being disposed with the edges of adjacent damper bodies in slightly spaced lateral end-to-end alignment across the width of said frame opening; d. a source of sealing fluid maintained at a pressure greater than that of the fluids conducted through said duct system; e. means for connecting the interior of said damper bodies to said sealing fluid source; and f. means for discharging said sealing fluid from the interior of said damper bodies to the spaces between adjacent damper bodies when the same are in their closed position.
Claim 2
Dependent Claim
139 words
In a duct system for conducting fluids, the combination comprising: a. a frame defining an opening for the passage of fluids therethrough; b. a plurality of hollow damper bodies journaled for pivotal movement in said frame between an open and a closed position; C. said damper bodies in said closed position being disposed with the edges of adjacent damper bodies in slightly spaced lateral end-to-end alignment across the width of said frame opening; d. a source of sealing fluid maintained at a pressure greater than that of the fluids conducted through said duct system; e. means for connecting the interior of said damper bodies to said sealing fluid source; and f. means for discharging said sealing fluid from the interior of said damper bodies to the spaces between adjacent damper bodies when the same are in their closed position.
Claim 3
Dependent Claim
69 words
The combination of claim 1 wherein said damper bodies each comprise a sheet material casing defining a member having oppositely extending arms terminating in end edges extending from the longitudinal axis thereof, the end edges of adjacent damper bodies being disposed in substantial end-to-end alignment when said damper bodies are in their closed positions, and said sealing fluid discharge means includes means forming openings spaced along said end edges.
Claim 4
Dependent Claim
29 words
The combination of claim 2 including oppositely spaced seal plates substantially coextensive with said end edges, said seal plates defining a space into which said sealing fluid is discharged.
Claim 5
Dependent Claim
17 words
The combination of claim 3 wherein said seal plates are laterally adjustable with respect to said edges.
Claim 6
Dependent Claim
83 words
The combination of claim 2 wherein the connection of the interior of said damper bodies to said sealing fluid source is effected by a damper suPport formed of a hollow member extending into each of said damper bodies, said damper support being journaled for pivotal movement at each end in said frame, one of said ends connecting with said sealing fluid source, and means in said support placing the interior of said member in fluid communication with the interior of said damper body.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |