Patent ID: 8491404

Claim:
A golf practice bat for adjusting top, impact, and finish timing, comprising: a shaft of a stick shape having a diameter adapted to be grasped by hand; a head portion ( 3 ) of a pillar shape having a diameter larger than the shaft, the head portion ( 3 ) being integrally formed on a lower portion of the shaft; a weight ( 5 ) made of a metal material and integrally contained on an inner lower portion of the head portion ( 3 ) so that, while forming a predetermined weight feeling, a load is concentrated on a lower portion of the head portion ( 3 ); a first notice tube ( 13 ) contained and installed in a upright position on an inner intermediate portion of the head portion ( 3 ), the first notice tube ( 13 ) having a top metal plate ( 14 ) fixedly installed on an inner upper portion, a buffer material ( 15 ) fixedly installed on a lower portion to prevent generation of a collision sound, and a first notice ball ( 16 ) movably contained inside the first notice tube ( 13 ) so that, when the head portion ( 3 ) is turned upside down and reaches top and finish positions during back and follow swings, the first notice ball ( 16 ) comes down to the top metal plate ( 14 ) and generates collision sounds enabling estimation of positions and timing of top and finish; and a second notice tube ( 17 ) contained and installed in a upright position on the inner intermediate portion of the head portion ( 3 ) together with the first notice tube ( 13 ), the second notice tube ( 17 ) having a magnet plate ( 18 ) fixedly installed on an inner upper portion, a bottom metal plate ( 19 ) fixedly installed on a lower portion, and a second notice ball ( 20 ) movably contained inside the second notice tube ( 17 ) so that the second notice ball ( 20 ) abuts and attaches to the magnet plate ( 18 ) in a top position and, when a predetermined rotational force is applied at a time of impact during a down swing, the second notice ball ( 20 ) escapes from the magnet plate ( 18 ), reaches the bottom metal plate ( 19 ), and generates a collision sound enabling estimation of impact timing.