POSITIVE DRIVE COVER SYSTEM

摘要

A swimming pool cover fabric has beads attached to its opposite edges. Each bead is positioned to essentially abut the bead in front to form in effect a segmented rod. A drive mechanism has a sprocket to engage each bead and urge it into and out of the race or slot in a track sized to receive the beads. A reversible motor is connected to drive the sprocket to urge the beads and, in turn, the pool cover fabric between open and closed positions.