Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – With mounting or supporting means
Reexamination Certificate
2007-11-20
2007-11-20
Johnson, Blair M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
With mounting or supporting means
C160S193000
Reexamination Certificate
active
10974097
ABSTRACT:
A counterbalance system for an upward acting door includes a cable drum support shaft and a torsion spring drive mechanism mounted adjacent one or both sides of the door and drivably connected to the drum support shaft. The spring drive mechanism includes a torsion coil spring mounted on a frame and connected to a vertically oriented shaft which, in turn, is connected to an output shaft by way of a bevel gear drive. A spring winder device is connected to one end of the spring and to the frame. Indicia on the spring is viewable through a window on the mechanism frame for indicating the number of revolutions imposed on the spring to set a predetermined counterbalance torque.
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Krupke LeRoy G.
Suchici Marius C.
Gardere Wynne & Sewell LLP
Johnson Blair M.
Overhead Door Corporation
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