US3575229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke seal for curtain-type fire dampers
Assignee: AMERICAN WARMING AND VENTILATING Inc
•
Filing: 1969-08-11
•
Granted: 1971-04-20
•
Expires: 1989-08-11
Abstract
Abstract A smoke seal for a curtain-type fire damper is provided. The seal comprises two metal strips located adjacent the side frame members of the fire damper, each being urged inwardly by a pair of resilient strips therebehind. The extent of inward movement of the strips is restricted by suitable stops located adjacent one end-frame member of the fire damper. The strips contact the ends of the fire damper blade sections when they are closed to provide an effective smoke seal therebetween.
Inventors
- 👤 Raymond L Alley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:57
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; A62C2/14; A62C2/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A fire damper comprising two side frame members and two end frame members, a plurality of connected sequential blade sections, an edge of one said blade sections being affixed to one of said end frame members, means holding said blade sections in a retracted position adjacent said one end frame member, a pair of spaced, parallel vertical flanges on the inner side of each of said side frame members and extending inwardly therefrom, the flanges of each pair being spaced apart a distance greater than the width of said blade section, a vertically extending blade edge sealing strip positioned between each of said pairs of vertical flanges and resiliently contacting the ends of said blade sections, and stop means adjacent the other of said end frame members and engaging the corresponding ends of said sealing strips for limiting the inward movement thereof.
Claim 2
Dependent Claim
142 words
A fire damper comprising two side frame members and two end frame members, a plurality of connected sequential blade sections, an edge of one said blade sections being affixed to one of said end frame members, means holding said blade sections in a retracted position adjacent said one end frame member, a pair of spaced, parallel vertical flanges on the inner side of each of said side frame members and extending inwardly therefrom, the flanges of each pair being spaced apart a distance greater than the width of said blade section, a vertically extending blade edge sealing strip positioned between each of said pairs of vertical flanges and resiliently contacting the ends of said blade sections, and stop means adjacent the other of said end frame members and engaging the corresponding ends of said sealing strips for limiting the inward movement thereof.
Claim 3
Dependent Claim
24 words
A fire damper according to claim 1 characterized further by said stop means comprising two flanges exTending outwardly from said other end frame member.
Claim 4
Dependent Claim
55 words
A fire damper according to claim 1 characterized further by said stop means comprising a pair of flanges extending outwardly from said other end frame member and extending longitudinally thereof, and a flat strip connecting said longitudinally extending flanges and engageable by the last one of said blade sections when the fire damper is closed.
Claim 5
Dependent Claim
36 words
A fire damper according to claim 1 in which the sealing strips are flat and there are separate resilient means located between said strips and the respective adjacent side frame members for biasing said strips inwardly.
References Cited (Backward Citations)
US3273632A
Cited
US2221059A
Cited
US2767441A
Cited
AU248761A
Cited
US3336698A
Cited
US3495606A
Cited
US3483658A
Cited
US3453780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |