Bat structure in a baseball bat

Abstract

To provide a bat structure that enables a batter to achieve a system of changing of the grip center position Gc of palm gripping by a bottom hand to Gc 1 of palm gripping by bottom hand and a half of upper hands, which leads to move the batting centroids Pc to Pc 1 . Also, the bat structure is also provided in which by adding a weight ΔM (10˜100 gr) to the bat head H of the bat having the grip structure of the kind referred to above, the batting energy at the sweet spot is improved to enhance the impact having the maximum batting effect together with change of the batting centroids Pc to Pc 1.

What is claimed is: 
     
         1 . A bat structure which includes a bat head (H), a bat barrel portion (B), a bat throat portion (T), a bat grip portion (G) and a grip end (E), and the bat whole length is less than 86 cm according to the rule and the length of the bat grip portion is 25 to 35% of the bat whole length wherein;
 1) the grip portion (G) comprises 3 parts extending from the grip end (E) to the bat throat portion (T) and a first part close to the grip end (E) has about half length of the grip portion and a sectional shape perpendicular to a longitudinal axis of the bat, which shape is represented by a generally vertical oval shape all over suited for gripping with palms of a bottom hand and a upper hand, a second part has less than one sixth length of the grip portion and a sectional shape perpendicular to a longitudinal axis of the bat, which shape is gradually changed from a generally vertical oval shape to a generally circle shape suited for gripping with thumb and index fingers of the upper hand and a third part close to the throat portion (T) has a remaining length of the grip portion and a sectional shape perpendicular to a longitudinal axis of the bat, which shape is represented by a generally circle shape.   
     
     
         2 . The bat structure as claimed in  claim 1 , in which the bat whole length for adult can be chosen from 82 cm to 86 cm while the bat whole length for boy can be chosen from 68 cm to 80 cm, and the length of the first part in the grip portion (G) is set from 11 cm to 14.5 cm. 
     
     
         3 . The bat structure as claimed in  claim 1 , characterized in that:
 2) the grip end (E) is inclined forwards at an angle within a range of 20 to 30 degrees relative to a plane perpendicular to the longitudinal axis of the bat, and has a lock structure capable of turning about the hand wrist of the bottom hand to urge towards a thumb side.   
     
     
         4 . The bat structure as claimed in  claim 1 , characterized in that:
 3) the grip end includes a top side, a bottom side which being opposite to the top side, a first right side and a second left side being opposite to the first right side, and projects laterally outwardly at the first right side or the second left side of an end inclined face over the generally oval section of the grip portion to form a bulge portion having a step portion between the grip end and the grip portion (G) for engaging with the little finger tip or the palm edge adjacent to the little finger third joint of the bottom hand in a manner to prevent the bottom hand edge from slipping out from the grp end during the swinging,   
     
     
         5 . The bat structure as claimed in  claim 1 , characterized in that:
 4) a weight of the bat head H can be increased by adding a weight ΔM (10˜100 gr) to move the gravity center (C) of the bat from the original position toward the batting centroids Pc.