Bat gripping structure and bat structure provided with same

Abstract

To provide a bat gripping structure that enables a batter to achieve a proper grip, a grip structure is provided in which the bat is in the “top” position during the take-back of batting, in order to accomplish the swing “to put the bat outwardly from inside” along a line of the bottom hand, a locking structure that enables a lower region (bottom grip) of the grip portion to be gripped at the grip portion of the bat under the palmar grip is employed to provide the grip structure effective to lock the palmar grip of the bottom hand, so that a proper swing to “put the bat out from inside” may be achieved and the angular velocity during the bat swinging is increased. 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.

1 . A bat grip structure which includes a bat head H, a bat barrel portion, a bat throat portion T, a bat grip portion G and a grip end E, characterized in that:
 1) in the grip portion G extending from the grip end to the bat throat portion T, the grip portion has a sectional shape perpendicular to the longitudinal axis of the bat, which shape is represented by a generally oval shape suited for gripping with a palm, in which when the grip center Gc is moved to Gc1, the batting centroid Pc is adjustable to Pc1 while securing the palm grip of the bottom hand is secured,   and in that 2) the grip end is inclined forwards at an angle within the 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,   and in that 3) the grip end bulges, laterally outwardly at least one side of an end inclined face over the generally oval section of the grip portion to form a Japanese OTAFUKU shaped bulge portion having a step portion between the grip end and the grip portion G for engaging with the little finger tip and/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.   
     
     
         2 . The bat structure as claimed in  claim 1 , in which the bat grip portion G is such that 1)′, when the palm of the bottom hand is in contact with a portion of the grip portion G ranging from the grip end to the bat throat portion T, the sectional shape perpendicular of the grip portion ranging from the palm of the bottom hand to the middle finger of the upper hand that lies perpendicular to the longitudinal axis of the bat is represented by a generally oval shape suited for gripping by the palm, and an inclined portion is formed in a direction upwardly of the bat over the middle finger of the upper grip to change at least the grip portion oval sectional shape to a circular sectional shape of the bat throat portion with a decreased cross sectional area to thereby form a double stepped grip; and
 in that with the grip center Gc moved to Gc1, one selection is possible from two positions, one is a half palmar grip position, where the forefinger and the thumb finger are released and the other is a finger grip position where the top hand on the inclined portion with a decreased cross sectional area is under a finger grip, while the bottom hand is secured, thereby adjusting the batting centroid from Pc to Pc1. 
 
     
     
         3 . The bat grip structure as claimed in  claim 1 , in which in at least an intermediate portion of the semi-perimetric portion of the grip portion that is gripped by the palm of the bottom hand and the upper hand and in the vicinity thereof 3) an inclined portion for increasing the coefficient of friction of the grip is formed to thereby reinforce the palm grip. 
     
     
         4 . A bat grip structure which includes a bat head H, a bat barrel portion, a bat throat portion T, a bat grip portion G and a grip end E, characterized by the provision of:
 1) a gravitational center position changing structure for displaying the original position of a bat center of gravity C, which lies at the bat barrel portion B, in a batting centroid Pc direction by adding an additional weight ΔM to the bat head, the grip portion has a sectional shape perpendicular to the longitudinal axis of the bat, which shape is represented by a generally oval shape suited for gripping with a palm, in which when the grip center Gc is moved to Gc1, the batting centroid Pc is adjustable to Pc1 while securing the palm grip of the bottom hand is secured,   and in that 2) the grip end is inclined forwards at an angle within the range of 20 to 30 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   and 3) the grip end bulges, laterally outwardly at least one side of an end inclined face over the generally oval section of the grip portion to form a Japanese OTAFUKU shaped bulge portion having a step portion between the grip end and the grip portion G for engaging with the little finger tip and/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,   and a function of transmitting the batting centroid Pc˜Pc1 where the maximum moment ω imposed on the center of gravity that is obtained at the maximum angular velocity ω brought about by the grip structure.   
     
     
         5 . The bat structure as claimed in  claim 4 , characterized in that
 the bat grip portion G is such that 1)′, when the palm of the bottom hand is in contact with a portion of the grip portion G ranging from the grip end to the bat throat portion T, the sectional shape perpendicular of the grip portion ranging from the palm of the bottom hand to the middle finger of the upper hand that lies perpendicular to the longitudinal axis of the bat is represented by a generally oval shape suited for gripping by the palm, and an inclined portion is formed in a direction upwardly of the bat over the middle finger of the upper grip to change at least the grip portion oval sectional shape to a circular sectional shape of the bat throat portion with a cross sectional area to thereby form a double stepped grip; and   in that with the grip center Gc moved to Gc1, one selection is possible from two positions, one is a half palmar grip position, where the forefinger and the thumb finger are released and the other is a finger grip position where the top hand on the inclined portion with a decreased cross sectional area is under a finger grip, while the bottom hand is secured, thereby adjusting the batting centroid from Pc to Pc1.   
     
     
         6 . The bat structure as defined in  claim 4  or  5 , characterized in that in an at least intermediate portion of a semi-perimetric portion of the grip portion wrapped by the palm of the bottom hand and the upper hand and in the vicinity thereof, 4) the region for increasing the coefficient of friction of the grip is formed to reinforce the palmar grip