US Patent 7458907 Artificial pitcher for practicing the hitting skill of baseball

An artificial pitcher for practicing the hitting skill of baseball includes an artificial pitcher on a support and having a ball holder on top, a main spring biased a stroke which are held by a hook on a hollow interior cylindrical main body, and a control device positioned remote from the pitcher having a rope to control the hook to release the stroke to hit a baseball from the ball holder flying to a batter. In order to pitch a transforming ball, an angular adjustment plate is positioned beside the main body to help the main body to adjust its angle of elevation.