Patent ID: 6926618
Filing Date: 2005-08-09
Classification: A63B

Abstract:
1. A golf club head comprising: a hollow body including a face composed of a forged metal material, said face comprising a ball striking surface and a back surface opposite the ball striking surface, said face comprising a heel edge, a toe edge, a sole edge and a crown edge; a first diagonal stiffening region on said back surface extending along a first axis from a heel-sole quadrant to a central region of the face; a second diagonal stiffening region on said back surface extending along a second axis from a heel-crown quadrant to said central region of the face; a third diagonal stiffening region on said back surface extending along a third axis from a toe-crown quadrant to said central region of the face; a fourth diagonal stiffening region on said back surface extending along a fourth axis from a toe-sole quadrant to said central region of the face; said first diagonal stiffening region having a thickness that tapers gradually from a first thickness proximal said first axis to a second thickness distal from said first axis, said second diagonal stiffening region having a thickness that tapers gradually from a third thickness proximal said second axis to a fourth thickness distal from said first axis, said third diagonal stiffening region having a thickness that tapers gradually from a fifth thickness proximal said third axis to a sixth thickness distal from said third axis, said fourth diagonal stiffening region having a thickness that tapers gradually from a seventh thickness proximal said second axis to an eighth thickness distal from said fourth axis; said first thickness being greater than said second thickness, said third thickness being greater than said fourth thickness, said fifth thickness being greater than said sixth thickness and said seventh thickness being greater than said eighth thickness; and a locally thickened central region having a thickness which tapers gradually along a vertical axis extending from said locally thickened central region toward said sole edge and said crown edge and which tapers along a horizontal axis extending from said locally thickened central region toward said heel edge and said toe edge, the thickness of said locally thickened central region tapering more abruptly than the thickness of said diagonal stiffening regions.