US3796249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resettable fire damper
Assignee: Individual
•
Filing: 1972-09-29
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Granted: 1974-03-12
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Expires: 1992-09-29
Abstract
Abstract The folding blade type fire damper is provided with a thermally actuated resettable release link and retraction means cooperating with the link to reset the blades in their retracted condition upon actuation from outside the duct in which the damper is mounted.
Inventors
- 👤 Cabe F Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:15
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06; A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; A62C2/14; A62C2/16; F; F16; F16G; F16G15/00; F16G15/04; F16G15/12; F24; F24F; F24F11/00; F24F11/30; F24F11/32; F24F11/33; F24F11/35; F24F11/88; F24F2110/00; F24F2110/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable blade retraction means connected to said damper to move the blades from their unfolded condition to their folded condition and retain them in their folded condition upon manual actuation from outside said damper; said resettable blade retraction means comprising a flexible member attached to said damper and connected to a releasable retaining means; a plurality of brackets attached to the outside of said damper; said flexible member being passed about said brackets to take up the slack in said flexible member and to retain said flexible member in a taut condition while said blades are retained in their fully retracted condition; said releasable retaining means comprising a bimetallic element cantilevered from a support fixed relative to said damper; said element having a pin at the free end thereof for engaging a loop formed in said flexible member and thereby retaining said flexible memBer in a taut condition as aforesaid.
Claim 2
Dependent Claim
170 words
In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable blade retraction means connected to said damper to move the blades from their unfolded condition to their folded condition and retain them in their folded condition upon manual actuation from outside said damper; said resettable blade retraction means comprising a flexible member attached to said damper and connected to a releasable retaining means; a plurality of brackets attached to the outside of said damper; said flexible member being passed about said brackets to take up the slack in said flexible member and to retain said flexible member in a taut condition while said blades are retained in their fully retracted condition; said releasable retaining means comprising a bimetallic element cantilevered from a support fixed relative to said damper; said element having a pin at the free end thereof for engaging a loop formed in said flexible member and thereby retaining said flexible memBer in a taut condition as aforesaid.
Claim 3
Independent Claim
183 words
A method of resetting the blades of a folding blade fire damper in their folded condition from outside the damper frame, said damper having a plurality of blades extending between a folded and unfolded condition and being embraced in part by a flexible member which coacts with a releasable retaining means comprising a bimetallic element cantilevered from a support fixed relative to said damper frame, said element having pin extending from the free end thereof for engaging said flexible member, thereby retaining it in a taut condition while said blades are retained in their fully retracted condition; said damper frame having a plurality of flanges extending from the outside thereof, comprising the steps of: withdrawing a portion of the flexible member through the damper frame to thereby shorten the portion of said member within said frame and simultaneously move the blades from an unfolded to a folded condition; and then manually setting the flexible member so that it maintains the blades in their folded condition, by wrapping it about said flanges to take up the slack and then looping it about said pin.
Claim 4
Independent Claim
183 words
A method of resetting the blades of a folding blade fire damper in their folded condition from outside the damper frame, said damper having a plurality of blades extending between a folded and unfolded condition and being embraced in part by a flexible member which coacts with a releasable retaining means comprising a bimetallic element cantilevered from a support fixed relative to said damper frame, said element having pin extending from the free end thereof for engaging said flexible member, thereby retaining it in a taut condition while said blades are retained in their fully retracted condition; said damper frame having a plurality of flanges extending from the outside thereof, comprising the steps of: withdrawing a portion of the flexible member through the damper frame to thereby shorten the portion of said member within said frame and simultaneously move the blades from an unfolded to a folded condition; and then manually setting the flexible member so that it maintains the blades in their folded condition, by wrapping it about said flanges to take up the slack and then looping it about said pin.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |