Patent US3785272A successfully refreshed from Google Patents.
US3785272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air diffuser fire damper
Assignee: Trane US Inc
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Filing: 1972-03-24
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Granted: 1974-01-15
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Expires: 1992-03-24
Abstract
Abstract A fire damper apparatus for use with a ceiling mounted air distributor or diffuser. The fire damper is held in the inoperative position against the urging of torsion springs by fusible pins. Melting of the pins allows the damper to rotate into the operative position.
Inventors
- 👤 Nabney J Mc
- 👤 G Hantke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:31
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1812
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
An air diffusing apparatus adapted for installation in a suspended ceiling construction, said apparatus including an air receiving portion having an air inlet and an air outlet, said air outlet including first and second channel members, said channel members being spaced apart to form an air discharge slot therebetween, a plurality of vertical support members disposed in said slot and connected to said channel members; at least one damper blade operably connected to said support members by means of pin fastening means, said pin fastening means providing a rotational axis for said damper blade; at least one torsion spring in operative engagement with said damper blade; a fusible element cooperating with at least one of said support members and said damper blade, whereby said damper blade is rotated to a closed position relative to said air discharge slot by the force of said spring upon destruction of said fusible member.
Claim 2
Dependent Claim
150 words
An air diffusing apparatus adapted for installation in a suspended ceiling construction, said apparatus including an air receiving portion having an air inlet and an air outlet, said air outlet including first and second channel members, said channel members being spaced apart to form an air discharge slot therebetween, a plurality of vertical support members disposed in said slot and connected to said channel members; at least one damper blade operably connected to said support members by means of pin fastening means, said pin fastening means providing a rotational axis for said damper blade; at least one torsion spring in operative engagement with said damper blade; a fusible element cooperating with at least one of said support members and said damper blade, whereby said damper blade is rotated to a closed position relative to said air discharge slot by the force of said spring upon destruction of said fusible member.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 wherein said torsion spring is coaxially mounted on one of said pin fastening means.
Claim 4
Dependent Claim
32 words
The apparatus of claim 1 including an inverted U-shaped member connected to said vertical support members and running lengthwise of said slot whereby said slot is subdivided into two parallel diffusing slots.
Claim 5
Dependent Claim
27 words
The apparatus of claim 3 having two damper blades operably connected to said support members, each damper blade adapted to close one of said parallel diffusing slots.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |