US Patent 9889349 Golf club head having stress-reducing structures

A golf club head comprising a body and a plurality of stiffening members is disclosed herein. The body comprises a face section, a sole section, and a crown section or a return section, and also defines a hollow interior. Each of the plurality of stiffening members extends from the crown section or return section to the sole section to reduce stresses placed on the face during impact with a golf ball. The stiffening members preferably are preloaded, and may be tightened using a tool. Each of the stiffening members has a midsection that is preferably selected from the group consisting of a solid metal rod, a hollow metal tube, and a spring, and each preferably is composed of a titanium alloy.