US3866656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding blade fire damper
Assignee: Individual
•
Filing: 1973-05-03
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Granted: 1975-02-18
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Expires: 1993-05-03
Abstract
Abstract A motor operated geared pulley system is provided for retracting the blades of a folding blade fire damper. Drive means are provided attached to the motor operated system to counteract the frictional forces in the system by driving a portion of it in reverse, thereby allowing the retracted blades to fully extend when the motor is shut off.
Inventors
- 👤 Francis J Mccabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:49
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06; A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; A62C2/14; A62C2/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
201 words
In a damper having blades movable between a folded and unfolded condition and having a motor operated means connected thereto to move said blades to said folded condition, the improvement comprising: drive means directly connected to the motor operated means to drive said motor operated means in a reverse direction to the movement of said means when folding said blades, said motor operated means comprising a motor and gear train system, said drive means being directly connected to said gear train system to overcome the frictional resistance of that gear train system to allowing the blades to move to an unfolded condition, said motor operated means having a spool connected to a flexible member disposed about said blades to move said blades to a folded condition upon rotation of said spool in one direction, said drive means being directly connected to said spool to rotate said spool in the opposite direction, and wherein the blades create a tension in said flexible member which is resisted by the frictional forces of said gear train system, and wherein said drive means rotates said spool to reduce the tension in said flexible member to thereby allow said blades to move to an unfolded condition.
Claim 2
Dependent Claim
201 words
In a damper having blades movable between a folded and unfolded condition and having a motor operated means connected thereto to move said blades to said folded condition, the improvement comprising: drive means directly connected to the motor operated means to drive said motor operated means in a reverse direction to the movement of said means when folding said blades, said motor operated means comprising a motor and gear train system, said drive means being directly connected to said gear train system to overcome the frictional resistance of that gear train system to allowing the blades to move to an unfolded condition, said motor operated means having a spool connected to a flexible member disposed about said blades to move said blades to a folded condition upon rotation of said spool in one direction, said drive means being directly connected to said spool to rotate said spool in the opposite direction, and wherein the blades create a tension in said flexible member which is resisted by the frictional forces of said gear train system, and wherein said drive means rotates said spool to reduce the tension in said flexible member to thereby allow said blades to move to an unfolded condition.
Claim 3
Dependent Claim
12 words
The invention of claim 1 wherein said drive means comprises a spring.
Claim 4
Dependent Claim
28 words
The invention of claim 2 wherein said spring is a coiled spring disposed about a shaft remote from said spool and having one end connected to said spool.
Claim 5
Dependent Claim
35 words
The invention of claim 3 wherein said spool has a larger diameter than the coil of said spring to wind said spring thereon as said motor operated means moves said blades to a folded condition.
Claim 6
Dependent Claim
45 words
The invention of claim 4 wherein the end of said spring connected to said spool is offset internally of the spool from the periphery of the spool about which the spring is wound as the motor operated means moves the blades to a folded condition.
References Cited (Backward Citations)
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Cited
US3156430A
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US3313338A
Cited
US3580321A
Cited
US3665996A
Cited
US3739832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |