Patent ID: 8137219

Claim:
A baseball training bat comprising: a handle and a barrel, the barrel having an end distanced from, the handle, a channel being formed in the barrel from the end of the barrel and extending toward the handle; a first magnet within the channel, the first magnet riding axially on a lead screw within the handle to a user-desired location; a movable magnet disposed in the channel for translational movement between a housed position, wherein the movable magnet is adjacent the first magnet and wherein magnetic attraction holds the movable magnet in the housed position, and a swung position, toward which the movable magnet moves when sufficient centrifugal force is imparted to the movable magnet to overcome the magnetic attraction between the magnets; a wire coil surrounding at least a portion of the channel, the movable magnet moving through the coil when the movable magnet moves from the housed position to the swung position to induce a temporary electrical signal in the coil; and at least one light emitting diode (LED) mounted on the barrel and visible to a person swinging the bat, the LED being electrically connected to the coil to emit a flash of light at least in response to the movable magnet moving rapidly through the coil as a batter swings the bat, the bat containing no source of electrical power apart from the electrical power generated by the movable magnet moving through the coil.