Patent US3580321A successfully refreshed from Google Patents.
US3580321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke damper
Assignee: Philips Industrial Components Inc
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Filing: 1969-04-25
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Granted: 1971-05-25
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Expires: 1989-04-25
Abstract
Abstract A damper for automatically sealing building passages against the flow of fluids such as smoke. The damper comprises a plurality of blades held in a standby position by an energized motor and which automatically move to the closed position when the electrical energy to the motor is interrupted. Axial shifting of the motor responsive to electromagnetic forces effects the holding and release of the blade assembly.
Inventors
- 👤 James R Root
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:06
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; A62C2/14; A62C2/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
186 words
In a damper including a blade assembly movable from a standby position to a flow blocking position, means for releasably holding said assembly in said standby position comprising: a movable drive; means operably coupled with the drive and disposed to engage said assembly for preventing the movement of the assembly toward said blocking position when the drive moves in one direction and to permit movement of the assembly to said blocking position when the drive moves in the opposite direction; an electrically operated motor having a rotatable shaft engageable upon energization of said motor with the drive means for moving the latter in said one direction; and means operably coupled with said shaft for disengaging the latter from said drive upon deenergization of the motor to permit movement of the drive in said opposite direction, said motor including a stator and a rotor, the shaft being secured to the rotor for movement therewith, and means mounting the rotor and shaft for movement longitudinally of the shaft responsive to electromagnetic forces generated in the stator upon energization of said motor for engaging the shaft with said drive.
Claim 2
Dependent Claim
186 words
In a damper including a blade assembly movable from a standby position to a flow blocking position, means for releasably holding said assembly in said standby position comprising: a movable drive; means operably coupled with the drive and disposed to engage said assembly for preventing the movement of the assembly toward said blocking position when the drive moves in one direction and to permit movement of the assembly to said blocking position when the drive moves in the opposite direction; an electrically operated motor having a rotatable shaft engageable upon energization of said motor with the drive means for moving the latter in said one direction; and means operably coupled with said shaft for disengaging the latter from said drive upon deenergization of the motor to permit movement of the drive in said opposite direction, said motor including a stator and a rotor, the shaft being secured to the rotor for movement therewith, and means mounting the rotor and shaft for movement longitudinally of the shaft responsive to electromagnetic forces generated in the stator upon energization of said motor for engaging the shaft with said drive.
Claim 3
Dependent Claim
38 words
The invention of claim 1, wherein said disengaging means includes spring means disposed in the path of movement of said shaft toward the position thereof engaged with the drive for yieldably biasing the shaft toward said disengaged position.
Claim 4
Dependent Claim
32 words
The invention of claim 2, wherein said motor includes a housing, said spring means comprising a leaf spring secured to the housing and extending into the path of travel of said shaft.
Claim 5
Dependent Claim
19 words
The invention of claim 3, wherein is included a cover carried by said housing and extending over the spring.
Claim 6
Dependent Claim
67 words
The invention of claim 1, wherein said means disposed to engage the assembly for preventing movement thereof comprises an elongated, flexible element having one end anchored in a fixed position, and wherein said drive includes a windup reel, the other end of said element being secured to the reel whereby energization of the motor winds the reel tensioning the element to the position for holding said assembly.
Claim 7
Dependent Claim
19 words
The invention of claim 5, wherein is included a temperature fusible link interposed between the ends of said element.
Claim 8
Dependent Claim
45 words
The invention of claim 5, wherein said damper includes a frame, and wherein the assembly includes a plurality of blades hinged to one another along longitudinal marginal edges to present a foldable curtain, the end blade of said curtain being pivotally secured to said frame.
Claim 9
Dependent Claim
18 words
The invention of claim 7, wherein said one end of the flexible element is secured to the frame.
Claim 10
Dependent Claim
45 words
The invention of claim 5, wherein said reel comprises a pair of end flanges and a spool extending between the flanges, and wherein is included means for adjusting the diameter of the spool for regulating the torque imparted to the element for tensioning the latter.
Claim 11
Dependent Claim
38 words
The invention of claim 1, wherein said drive includes a gear, and wherein is included a cog carried by the shaft and engageable with the gear upon energization of the motor for coupling the shaft to the drive.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |