Flexible or portable closure – partition – or panel – Automatic control – With starting or driving means
Reexamination Certificate
2006-02-21
2006-02-21
Johnson, Blair M. (Department: 3634)
Flexible or portable closure, partition, or panel
Automatic control
With starting or driving means
C160S002000, C160S009000
Reexamination Certificate
active
07000668
ABSTRACT:
A system and method for rapidly and reliably sealing off a selected opening from the passage of smoke, noxious fumes, or contaminated air includes a powered clutch and viscous governor that provides a fail-safe mode of operation. A curtain is positioned in a housing adjacent to an upper limit of an opening such as a hoist access-way. The curtain is wrapped around a spindle that is connected to a spool via two cords. The curtain is held in the housing in a stored configuration by a powered clutch so that upon removal of power, either via a controller or by power loss, the clutch releases the spool allowing the cord to unwind lowering and thus deploying the curtain. A capacitor can be included to prevent inadvertent deployments due to momentary power loss. The speed at which the spool rotates, and correspondingly the curtain deploys, is limited by a viscous governor coupled to the spool. The curtain includes flexible magnets that attach to ferrous side rails forming a nearly air tight seal preventing the passage of smoke, noxious fumes or contaminated air through the opening.
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Allen Thomas A.
Holstine Eric
Klocek Kevin
Sears John J.
Strieb Tasche L.
Johnson Blair M.
Perkins Coie LLP
Smoke Guard Corporation
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