Patent ID: 8491415
Filing Date: 2013-07-23
Classification: A63B

Abstract:
1. A putter head, comprising: a head body having a face having a recess formed in a central area of the face; and a face insert fitted in the recess, the face insert being made of polymer materials, the face insert having a multilayer structure made up of an outer layer having a ball-hitting surface that is exposed outside the putter head and an inner layer located on an inner side of the head body, wherein a first smash factor of a first polymer material forming the outer layer is lower than a second smash factor of a second polymer material forming the inner layer, wherein a groove group made up of a plurality of parallel grooves is formed in an external surface of the outer layer, the groove group including a first groove group and a second groove group of different types, wherein the grooves of the first groove group are approximately 0.25 to 1.6 mm wide and approximately 0.05 to 0.5 mm deep and the grooves of the second groove group are approximately 0.075 to 0.5 mm wide and approximately 0.025 to 0.1 mm deep, the first groove group has a groove spacing of approximately 0.5 to 2.0 mm, and the grooves of the second groove group are placed between the grooves of the first groove group, wherein the grooves of the first and second groove groups are empty.