Putter type golf club head and putter type golf club

摘要

A putter type golf club head 1 having a face 2 for hitting a ball on a front side has a head main body 1A provided in a face 2 side with a concave portion 3 and a face insert 1B made of an elastic material attached to the concave portion 3 of the head main body 1A. The face insert 1B has a three-layered structure composed of a first layer 8 disposed in a frontmost side, a third layer 10 disposed in a rearmost side and a second layer 9 sandwiched between the first layer 8 and the third layer 10, wherein hardnesses h1, h2 and h3 and moduli of repulsion elasticity r1, r2 and r3 of the first layer 8, second layer 9 and third layer 10, respectively, satisfy relationships: h1>h2, h3>h2, r1>r2 and r3>r2.

主权项

1. A putter type golf club head having a face for hitting a ball on a front side, wherein
the head has a head main body made of a metal material provided in a face side with a concave portion, and a face insert attached to the concave portion of the head main body, the face insert has a three-layered structure made up of a first layer disposed in a frontmost side, a third layer disposed in a rearmost side and a second layer sandwiched between the first layer and the third layer, wherein each of the first, second and third layers is made of a synthetic resin or alternatively a rubbery elastomer, and the first layer, the second layer and the third layer have hardnesses h1, h2 and h3, respectively, and moduli of repulsion elasticity r1, r2 and r3, respectively, which satisfy the following relationships:
h1>h2,h3>h2,r1>r2 andr3>r2wherein
the hardness is Shore D hardness measured according to ASTM-D2240-68 “Standard Test Method for Rubber Property-Durometer Hardness”, and the modulus of repulsion elasticity is measured at a temperature of 23 degrees C. and a humidity of 50 RH % according to Japanese Industrial Standard K6255 “Rubber, vulcanized or thermoplastic—Determination of rebound resilience”.