US3738253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire and smoke ventilator
Assignee: CGM Inc
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Filing: 1971-11-24
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Granted: 1973-06-12
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Expires: 1991-11-24
Abstract
Abstract A roof mounted fire and smoke ventilator includes a simplified mechanism for maintaining the cover closed and which also serves as a snubbing device to cushion the opening shock of the cover when the vent snaps open. The mechanism includes a simple arrangement of cables which are connected between the curb of the vent and the free end of the cover. The cover is spring biased toward an open position but is held closed by the cables by an arrangement including a fusible link which, when melted, releases the cables and enables the vent cover to snap open. Means also are provided to release the cables without destroying the fusible link, as might be desired when testing the operation of the vent.
Inventors
- 👤 A Jentoft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:01
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; E; E04; E04D; E04D13/00; E04D13/03; E04D13/035; E04D13/0351; E04D13/0352; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/1041; E05F1/1066; E05F1/1075; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/148; E05Y2900/152; E05Y2900/154; F24F11/00; F24F11/30; F24F11/32; F24F11/33; F24F11/34; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
In a building vent having a curb and a cover hinged to the curb, a device for releasably constraining said cover in a closed position comprising: at least one main cable connected at one end to a free unhinged portion of said cover and at the other end to said curb wall, said cable being of a length and being so arranged as to restrain said cover from opening beyond a predetermined position; means biasing said cover toward said open position; means for engaging said main cable when said cover is closed to take up the slack in said cable and to maintain said cable taut to thereby retain said cover in said closed position; and means for releasing said cable engaging means to enable said cover to spring toward said open position, the extent of said open position being determined by the length of said main cable.
Claim 2
Dependent Claim
148 words
In a building vent having a curb and a cover hinged to the curb, a device for releasably constraining said cover in a closed position comprising: at least one main cable connected at one end to a free unhinged portion of said cover and at the other end to said curb wall, said cable being of a length and being so arranged as to restrain said cover from opening beyond a predetermined position; means biasing said cover toward said open position; means for engaging said main cable when said cover is closed to take up the slack in said cable and to maintain said cable taut to thereby retain said cover in said closed position; and means for releasing said cable engaging means to enable said cover to spring toward said open position, the extent of said open position being determined by the length of said main cable.
Claim 3
Dependent Claim
37 words
A device as defined in claim 1 wherein said means for engaging said main cable comprises: means engaging said main cable between its ends to restrain at least aportion of said cable in a substantially U-shaped configuration.
Claim 4
Dependent Claim
40 words
A device as defined in claim 2 wherein said building vent comprises a fire and smoke vent wherein said means for releasing said cable engaging means comprises: said means engaging said cable between said ends thereof including a fusible link.
Claim 5
Dependent Claim
74 words
A device as defined in claim 2 further comprising: said vent including two such cables, disposed on opposite lateral sides of said vent, each of said cables being constrained so that when in said U-shaped configuration, their bights extend toward each other, said means for engaging said main cable comprising: a connective member connected at its ends to said bights of said main cable, said connective member including said fusible link between its ends.
Claim 6
Dependent Claim
70 words
A device as defined in claim 4 wherein said connective member comprises a connective cable, said device further comprising: one of said bights being connected to its associated end of said connective cable by a split ring; and release cable means connected to said split rIng to effect withdrawal of said split ring from engagement of either of said bight or said connective cable when said release cable is pulled.
Claim 7
Dependent Claim
82 words
A device as defined in claim 5 wherein said means for restraining said cable in said U-shaped configuration comprises: means for releasing manually said connective cable from said main cables comprising: one of said bights being connected to its associated end of said connective cable by a split ring; and release cable means connected to said split ring to effect withdrawal of said split ring from engagement of either of said bight or said connective cable when said release cable is pulled.
Claim 8
Dependent Claim
23 words
A device as defined in claim 4 further comprising: means isolating aerodynamically generated forces tending to lift said dome from said fusible link.
Claim 9
Dependent Claim
29 words
A device as defined in claim 7 wherein said means for isolating said aerodynamic lifting forces from said fusible link comprises; means confining said forces to said main cable.
Claim 10
Dependent Claim
50 words
A device as defined in claim 8 wherein said means for confining said forces to said main cable comprises: said portion of said main cable between said bight thereof and said cover being wrapped about a member to engage frictionally said member, and means mounting said member to said curb.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |