Flexible or portable closure – partition – or panel – Roll type – With rotating means
Patent
1999-06-03
2000-12-05
Lev, Bruce A.
Flexible or portable closure, partition, or panel
Roll type
With rotating means
160191, 160197, 160198, 16198, A47G 502
Patent
active
061553271
ABSTRACT:
A counterbalance spring adjustment mechanism, particularly adapted for a rollup type upward-acting door which is supported between spaced apart wall brackets on a rotatable shaft. One end of the torsion spring is connected to a hub including a tubular hub member and a circumferential radially extending flange. The tubular hub member is disposed in a bore formed in one of the wall brackets and is retained in assembly therewith by a cylindrical collar. The door support shaft is disposed in a self-lubricating polymer bushing which is supported in the tubular hub member. A reinforcing collar is fixed to the wall bracket and includes a boss formed thereon having a lock pin receiving bore for receiving a lock pin which projects through the bore in the reinforcing collar, through a slot in the wall bracket and through a selected one of a plurality of circumferentially spaced pin-receiving bores in the hub flange for locking the hub in a selected rotative position which determines the torsional windup of the torsion spring.
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Ward, Jr. Craig S.
Wells David M.
Lev Bruce A.
Overhead Door Corporation
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