US Patent 7534178 Baseball batter training system

A system for training a batter to automatically swing at pitched balls corresponding to strikes and to refrain from swinging at pitched balls not corresponding to strikes, the device including a visual reference member suspended between a pitcher's mound and a home plate where the batter is located, at a location in front of the plate, so that the trajectory of a pitch from a pitcher's release point proximate the pitcher's mound to a point in a strike zone proximate the home plate consistently passes through a portion of the visual reference member.