| 摘要 |
Apparatus for extending and retracting a cover for a swimming pool includes a motor for selectively rotating a clutch in one direction or the other direction. A first pawl, extending within the clutch, drives a first cam to cause rotation of a set of pulleys for winding cords thereabout to extend the cover from about a roller and a second pawl, extending within the clutch, drives a second cam to cause rotation of the roller to wrap the cover thereabout. First and second lift arms lift the first and second pawls out of engagement with the first and second cams, respectively as a function of the direction of rotation of the clutch to ensure that only one of the first and second cams is rotated by the clutch. A cylinder mounted on a shaft in engagement with the armature of the motor is in frictional contact with spring loaded brakes within the clutch to transfer rotational movement of the armature to the clutch. A compensator in engagement with the cords, through pulleys therewithin and spools therewithout, compensates for changes in relative length of the cords over time and for lack of squareness of the pool.
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