Racket frame and racket

Abstract

A racket frame including a yoke part disposed between left and right portions of a throat part continuous with a head part and a shaft part; a string-mounting part, including the yoke part and the head part, which surrounds the ball-hitting face; and string holes formed on the string-mounting part. In this construction, supposing that a total of longitudinal string holes whose axial directions are parallel with a line drawn from an apex of the ball-hitting face to a center of a gripping part and transverse string holes whose axial directions are parallel with a widthwise direction, of the racket frame, which is orthogonal to the axial direction of the racket frame is Ns1 and that a total of all of the string holes is N1, a ratio of Ns1 to N1 is set to not less than 0.70 nor more than 1.0.

1 . A racket frame comprising: a yoke part disposed between left and right portions of a throat part continuous with a head part and a shaft part; a string-mounting part, including said yoke part and said head part, which surrounds said ball-hitting face; and string holes formed on said string-mounting part,
 wherein supposing that a total of longitudinal string holes whose axial directions are parallel with a line drawn from an apex of said ball-hitting face to a center of a gripping part and transverse string holes whose axial directions are parallel with a widthwise direction, of said racket frame, which is orthogonal to said axial direction of said racket frame is Ns1 and that a total of all of said string holes is N1, a ratio of Ns1 to N1 is set to not less than 0.70 nor more than 1.0.   
   
   
       2 . The racket according to  claim 1 , wherein string holes formed at said left and right connection portions adjacent to said yoke part and said left and right portions of said throat part are said longitudinal string holes extended longitudinally from said ball-hitting face side of said left and right connection portions to a peripheral surface of said left and right portions of said throat part. 
   
   
       3 . A racket comprising: a yoke part disposed between left and right portions of a throat part continuous with a head part and a shaft part; a string-mounting part, including said yoke part and said head part, which surrounds said ball-hitting face; and longitudinal strings and transverse strings mounted on said racket frame by stretching said longitudinal strings and said transverse strings on said ball-hitting face, with said longitudinal strings and said transverse strings in penetration through string holes formed on said string-mounting part,
 wherein supposing that a total of longitudinal string holes whose axial directions align with a direction in which said longitudinal strings inserted through said longitudinal string holes are stretched on said ball-hitting face and transverse string holes aligning with a direction in which said transverse strings inserted through said transverse string holes are stretched on said ball-hitting face is Ns2 and that a total of all of said string holes is N2, a ratio of Ns2 to N2 is set to not less than 0.70 nor more than 1.0.   
   
   
       4 . The racket according to  claim 3 , wherein string holes formed in left and right connection portions adjacent to said yoke part and said left and right portions of said throat part are said longitudinal string holes extended in the same direction as that of said longitudinal strings stretched on said ball-hitting face from a ball-hitting face side of said left and right connection portions to a peripheral surface of said left and right portions of said throat part. 
   
   
       5 . The racket according to  claim 3 , wherein an area of an inner opening of said string hole disposed at said ball-hitting face side is set larger than a sectional area of a string to be inserted through said string hole to allow said string to be inserted into said string hole without contact between an inner surface of said inner opening and said string. 
   
   
       6 . The racket according to  claim 4 , wherein an area of an inner opening of said string hole disposed at said ball-hitting face side is set larger than a sectional area of a string to be inserted through said string hole to allow said string to be inserted into said string hole without contact between an inner surface of said inner opening and said string.