Patent ID: 8900071
Filing Date: 2014-12-02
Classification: A63B

Abstract:
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 h wherein 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”.