US3866657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire damper
Assignee: Individual
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Filing: 1973-09-12
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Granted: 1975-02-18
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Expires: 1993-09-12
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
- 👤 Francis J Mccabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:30
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; A62C2/14; A62C2/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
In a fire damper having a frame and a plurality of blades interconnected for movement between a folded and unfolded condition, the improvement comprising: support means integral with said frame for retaining, supporting and permitting articulation of one of said blades, said blade being z-shaped and including a web portion; said support means comprising a plurality of flanges extending inwardly from opposite sides of said frame, each of said flanges being notched in a manner creating a tab, said notches receiving said web portion.
Claim 2
Dependent Claim
84 words
In a fire damper having a frame and a plurality of blades interconnected for movement between a folded and unfolded condition, the improvement comprising: support means integral with said frame for retaining, supporting and permitting articulation of one of said blades, said blade being z-shaped and including a web portion; said support means comprising a plurality of flanges extending inwardly from opposite sides of said frame, each of said flanges being notched in a manner creating a tab, said notches receiving said web portion.
Claim 3
Dependent Claim
24 words
The invention of claim 1 wherein said tabs are offset from said flanges and have their free ends extending substantially parallel to said flanges.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |