US3814165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire damper and method of fabricating same
Assignee: Individual
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Filing: 1971-10-26
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Granted: 1974-06-04
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Expires: 1991-10-26
Abstract
Abstract A folding blade fire damper is provided with a means for retaining the upper most blade, which means is integral with the damper frame. There is also provided a means for retaining the closure spring which means is integral with the frame. The method of notching out the frames to provide these means is disclosed. The spring closure is attached to the last blade of the damper in a novel manner. The blades are retained and articulated in combination with a novel connector member.
Inventors
- 👤 F Mccabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:06
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; A62C2/14; A62C2/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
189 words
In a fire damper having a frame with inwardly depending opposed side flanges, a plurality of z-shaped blades having web portions notched at the edges thereof, said flanges disposed in said notches, said blades interconnected along their longitudinal edges by separate connectors, for movement between a folded and unfolded condition, and a closure means for automatically drawing the blades from a folded open condition to an unfolded closed condition, the improvement wherein said closure means is retained and positioned to bring The faces of the blades into engagement with the faces of the flanges in the unfolded closed condition; said closure means comprising a spring attached to an end blade along that portion thereof intermediate the web and the next adjacent connector; and a retaining means for retaining said closure means comprising a tab formed integrally with a wall of said frame on the same side of the flange as the portion of the blade to which the spring is connected; said tab extending therefrom and having an intermediate cylindrical portion for mounting said closure means and a retainer portion for retaining said closure means on said cylindrical portion.
Claim 2
Dependent Claim
189 words
In a fire damper having a frame with inwardly depending opposed side flanges, a plurality of z-shaped blades having web portions notched at the edges thereof, said flanges disposed in said notches, said blades interconnected along their longitudinal edges by separate connectors, for movement between a folded and unfolded condition, and a closure means for automatically drawing the blades from a folded open condition to an unfolded closed condition, the improvement wherein said closure means is retained and positioned to bring The faces of the blades into engagement with the faces of the flanges in the unfolded closed condition; said closure means comprising a spring attached to an end blade along that portion thereof intermediate the web and the next adjacent connector; and a retaining means for retaining said closure means comprising a tab formed integrally with a wall of said frame on the same side of the flange as the portion of the blade to which the spring is connected; said tab extending therefrom and having an intermediate cylindrical portion for mounting said closure means and a retainer portion for retaining said closure means on said cylindrical portion.
Claim 3
Dependent Claim
23 words
The invention of claim 1 wherein said retainer portion is triangularly shaped and has ears extending beyond the diameter of said cylindrical portion.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |