Flexible or portable closure – partition – or panel – Automatic control – With retarding means
Patent
1999-04-07
2000-09-26
Purol, David M.
Flexible or portable closure, partition, or panel
Automatic control
With retarding means
160296, E05F 1520
Patent
active
061231347
ABSTRACT:
A mechanism for regulating the closing speed of a rolling fire door during an emergency condition. The speed regulating mechanism includes a viscous speed governor which is operatively connected to the support shaft of the fire door for providing a speed regulating damping torque as the door moves to a closed position. Methods for regulating the closing speed of a fire door during an emergency condition are also disclosed.
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Amy Schmitt, SPEED Governors, The Construction Specified, Aug. 1995 (pp. 87 & 89).
Vibratech, Inc., VIBRATECH.RTM. VSG.TM., Vibratech, Inc. sales brochure (no date).
Burns Michael L.
Thomas Gordon D.
Clopay Building Products Company Inc.
Purol David M.
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