Patent ID: 7048653
Filing Date: 2006-05-23
Classification: A63B

Abstract:
1. A ball retrieval device for ball games in which a playing ball is attached to a rubber-elastic thread element, wherein said rubber thread is retained in a thread storage device comprising the following parts: a spool including a recovery element capable of being tensioned through rotation of the spool, a carriage that is movable in the longitudinal direction of the spool, including a device for guiding said thread element, and a driving device of the carriage that is operatively connected to said spool in order to move the carriage in synchronicity with the rotational movement of said spool, so that the thread element wound up on said spool is capable of being unwound while tensioning said recovery element and of being automatically rewound on said spool while untensioning said recovery element, the winding operation being controllable by said device for guiding, wherein said driving device is equipped with at least one driving roller extending into a helical recess, thereby allowing to produce, during the rotation of said spool, a longitudinal movement of said carriage in synchronicity with a pitch of said helical recess.