Patent ID: 7727090

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 stationary magnet affixed within the channel; a movable magnet disposed in the channel for translational movement between a housed position, wherein the movable magnet is adjacent the stationary 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, wherein when the movable magnet passes through the coil, an electrical signal is temporarily induced in the coil, temporarily energizing the LED to cause it to flash.