Patent US6922632B2 successfully refreshed from Google Patents.
Patent US3570384A successfully refreshed from Google Patents.
US3570384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke and fire isolation device
Assignee: Individual
•
Filing: 1969-07-09
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Granted: 1971-03-16
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Expires: 1989-07-09
Abstract
Abstract A device for the isolation of smoke and fire in a ventilation system, in which an impervious box is interposed in the ventilation duct. The box has a pair of laterally offset openings in opposite walls of the box with a laterally flexible and a longitudinally compressible smoke impervious and fire retardant duct within the box connecting the two openings. The flexible duct is movable laterally out of registration with one of the openings to bear against the adjacent wall or equivalent plate means, with the consequent compression of the flexible duct providing a positive seal for the duct.
Inventors
- 👤 Wallace C Mcleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:25
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/265; Y10T137/2668; Y10T137/8593; Y10T137/877; Y10T137/87788
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
A smoke and fire isolation device for a ventilation system comprising: a box having smoke impervious and heat retardant walls forming a closed chamber, a first opening and a second opening in opposed walls of the chamber, said openings being offset longitudinally and laterally one from the other and adapted to be connected in a ventilation duct; a laterally flexible and longitudinally compressible impervious duct located within the chamber and connecting said spaced openings; bearing plate means extending laterally from the first opening and facing the second opening; and means to move that end of the flexible duct connected to the first opening laterally therefrom to bear wholly against the bearing plate means whereby the flexible duct is compressed and a seal is effected between the flexible duct and the bearing plate means.
Claim 2
Dependent Claim
133 words
A smoke and fire isolation device for a ventilation system comprising: a box having smoke impervious and heat retardant walls forming a closed chamber, a first opening and a second opening in opposed walls of the chamber, said openings being offset longitudinally and laterally one from the other and adapted to be connected in a ventilation duct; a laterally flexible and longitudinally compressible impervious duct located within the chamber and connecting said spaced openings; bearing plate means extending laterally from the first opening and facing the second opening; and means to move that end of the flexible duct connected to the first opening laterally therefrom to bear wholly against the bearing plate means whereby the flexible duct is compressed and a seal is effected between the flexible duct and the bearing plate means.
Claim 3
Dependent Claim
23 words
A device as claimed in claim 1 in which the moving means is actuated by the actuation of smoke or heat detection means.
Claim 4
Dependent Claim
23 words
A device as claimed in claim 1 in which the bearing plate means is that wall of the box carrying the first opening.
Claim 5
Dependent Claim
64 words
A device as claimed in claim 1 including a third opening facing the first opening and adapted to be connected to a smoke venting duct, and including a fire and heat retarding shield plate hinged adjacent the second opening, the shield plate lying against the flexible duct and removable therewith into a closed position separating the flexible duct from the first and third openings.
Claim 6
Dependent Claim
25 words
A device as claimed in claim 1 in which the flexible duct comprises a smoke impervious and heat retarding fabric reinforced by spaced metal banding.
Claim 7
Dependent Claim
49 words
A device as claimed in claim 1 in which the opposed walls of the chamber are parallel, the flexible duct having a circumferential flange mounted on the movable end thereof, that wall of the chamber carrying the first opening comprising the bearing plate and having the flange slidable thereon.
Claim 8
Dependent Claim
29 words
A device as claimed in claim 6 including track means fixed to the bearing plate, and roller means journally mounted on the flange and movable along the track means.
Claim 9
Dependent Claim
42 words
A device as claimed in claim 1 in which the moving means comprises a linkage assembly mounted adjacent the second opening and connected with the movable end of the flexible duct, and motive means adapted on actuation to move the linkage assembly.
References Cited (Backward Citations)
US3047020A
Cited
US3504615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |