Wedge type golf club including pitching wedge, approach wedge and sand wedge

Abstract

There is provided a golf club capable of giving a strong backspin to a golf ball. A shaft is connected to a head formed with score lines on a face surface thereof. A height from a sole face of the head or a horizontal plane flush with the sole face is formed greater than a radius of a golf ball. An upper protrusion and a lower protrusion are provided spacedly rearwardly of upper and lower portions of the head, respectively. By providing the center of gravity of the head in an upper portion than the center of the golf ball, backspin can be accelerated by a gear effect generated at the time of hitting the golf ball. Further, the height of up to the center of gravity of the head is freely adjustable.

1 . A wedge-type golf club, including a pitching wedge, an approach wedge and a sand wedge, comprising: a head having a sole face provided in a lower portion that acts as a ground contact surface, a face surface acting as a ball striking surface, provided on a front of said head with a certain loft angle, a shaft connecting portion on one side thereof, multiple score lines formed on the face surface of said head, and a shaft connected to said shaft connecting portion,
 wherein a height of the center of gravity of said head is at least 21.335 mm and greater than a radius of a golf ball, the height of the center of gravity of said head being defined as a distance from a horizontal plane flush with the sole face of said head to the center of gravity of said head;   the center of gravity of said head is provided at an anterior position to said face surface, and   wherein for the score lines as measured, 50% or more of the measured values of X divided by the pitch of the score line are less than or equal to 0.0030″ (0.0762 mm 2 /mm), where X denotes a traverse cross section of the groove per one score line, and the pitch of the score line is defined by the sum of the groove width and the groove separation.   
     
     
         2 . The wedge-type golf club according to  claim 1 , wherein said score lines are formed such that the measured value of X divided by the pitch of the score line for any single groove is less than or equal to 0.0032″ (0.0813 mm 2 /mm). 
     
     
         3 . The wedge-type golf club according to  claim 2 , wherein an upper protrusion and a lower protrusion are provided spacedly rearwardly of upper and lower positions of said head, respectively such that a distance between a rear end of said upper protrusion and said face surface is greater than a distance between a rear end of said lower protrusion and said face surface. 
     
     
         4 . The wedge-type golf club according to  claim 2 , wherein an upper protrusion and a lower protrusion are provided spacedly rearwardly of upper and lower positions of said head, respectively, said lower protrusion including a depressed portion formed on an upper surface thereof. 
     
     
         5 . The wedge-type golf club according to  claim 3 , wherein said lower protrusion includes a depressed portion formed on an upper surface thereof. 
     
     
         6 . The wedge-type golf club according to  claim 2 , wherein said loft angle is set at 52 to 56 degrees, and the center of gravity of said head is arranged in a position anterior to the face surface, but posterior to a distal end of the sole face.