Flexible or portable closure – partition – or panel – Roll type – With brake or stop
Patent
1997-11-18
1999-07-27
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Roll type
With brake or stop
160 8404, 160298, 160321, E06B 956
Patent
active
059273704
ABSTRACT:
A release brake shade operator for a window covering has a stationary member, a movable member movable relative to the stationary member, and a hub which is movable relative to the stationary member and the movable when not restrained. Preferably the hub is a tube or solid cylinder. A spring having a selected diameter is fitted between the stationary member and the movable member and surrounds a portion of the hub. A first tang at one end of the spring is attached to the stationary member and a second tang at an opposite end of the spring is attached to the movable member so that one tang can be moved relative to the other tang to increase the diameter of the spring. The spring is sized and positioned so that the spring will press against the outside surface of the hub when in a relaxed condition restraining the hub and attached to the roller shade or lift cords. The tangs of the spring are moved relative to one another by rotating the movable member to increase the diameter of the spring which releases the hub and allows it to rotate freely. Preferably the hub has a spool attached to one end about which a cord loop is wound which operates the movable member and the hub. In a present preferred embodiment the an offset gear arrangement which preferably has a slip clutch is interposed between the hub and the roller.
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