US Patent 7226373 Batting swing practice apparatus

A batting practice apparatus comprising an upright support mast associated with a base having a plurality of legs which are able to be mounted to a surface. A rotatable sleeve slides over the mast. The sleeve can rotate about the mast and a pin slides within the slots. An arm with a ball-shaped object at the distal end extends from the sleeve. An elastic member is associated at one end with the sleeve by means of a tab extending from the sleeve; and, at the other end is associated with a base leg. When the batter strikes the ball-shaped object, the sleeve rotates upward about the mast and returns as urged by the elastic member.