Abstract: A golf club head made of metal has a hollow construction with a pair of arcuate reinforcing ribs extending in horizontal and vertical planes with the arcuate ribs terminating at the striking plate of the golf club where a base structure of reinforcing ribs interconnect the ends of the arcuate ribs. The rib structure is molded integrally with the walls of the hollow club head and function to desirably reinforce the club head to prevent collapse or other distortion while providing a relatively large sweet spot and preventing undesired torque on the club head when a golf ball is hit at an off center location on the striking plate.

Abstract: In a preferred embodiment, a shaft for a golf club, the shaft including: tip and butt ends defined at opposite distal ends of the shaft's length; and the shaft having a balance point axially spaced from the tip end a distance in the range of from about 56 percent to about 58.5 percent of the shaft's length.

Abstract: An improved set of golf clubs has iron club heads in a correlated set such that the weight of longer shafted, less lofted clubs is concentrated more towards the heel of the head, while the weight of the shorter shafted, more lofted clubs is concentrated more towards the toe of the head. When viewed face on, with the sole of the club on a level surface, it will be noted that the vertical plane of the center of gravity of each individual head shall be shifted towards the toe or the heel, as the case may be, with such weight concentrations. The result is a set of correlated golf club heads which: (a) have less inertial drag in the longer, less lofted clubs, (b) have more inertial drag in the shorter, more lofted clubs, and (c) can utilize the gear effect phenomenon inherent in golf clubs more effectively.

Abstract: A golf club head has a pyramid-shaped truss located within an interior of the club head. The truss employs a triangular base placed directly behind a club head striking plate, with a plurality of struts extending from the base to converge at an apex at the tail of the club head. Two of the struts are preferably affixed to an inner side of a club head sole. The struts may be tubular or solid. The truss prevents distortion of the club head at head-ball impact, and also reduces the tendency of the club head to twist about its center of gravity when contact is made with the ball. The truss is particularly applicable to hollow, metal "wood" club heads, which typically must be designed with thinner striking plates. The truss also facilitates manufacture of composite graphite club heads by inexpensive injection molding techniques without compromising club head strength.