US Patent 10279225 Golf club head including impact influencing flexure joint

A hollow golf club head includes an inner surface and an outer surface, the golf club head further comprises a strike face operative to impact a golf ball, a body extending rearward from a perimeter of the strike face, and a flexure joint extending from the outer surface to the inner surface. The flexure joint includes a forward impact surface, a reaction surface in contact with the impact surface, and during an impact, the impact surface translates along the reaction surface to permit a controlled deflection of a portion of the strike face.