Golf driver with variable weighting for changing center of gravity

Claim 1

In a golf club head having sole, toe and heel portions and a face plate, the improvement comprising: three similarly dimensioned cavities including a central cavity, a cavity towards said toe portion, and a cavity towards said heel portion formed in said sole portion, said cavities being arranged in a line with adjacent cavities being spaced equidistantly from each other along said sole portion between the toe and heel portions, one of the ends of said cavities being open, a set of weight members, all of said weight members having the same dimensions which enables any one of said weight members to be fitted into any one of said cavities, some of the weight members of said set being of different density materials and different weights, cover plate means for removably covering the open ends of said cavities to retain the weights therein, said weight members being selectively installable in said cavities to provide a variety of different centers of gravity for said club head, the center of gravity being variably located horizontally between the toe and heel portions of said club head, said center of gravity being located at a position at the center of said central cavity when the weights of the weight members in the cavities towards the toe and heel portions are equal in weight to each other, the center of gravity being laterally shiftable from said position in accordance with a calculated value equal to the difference between the weight of the weight member in the cavity towards the toe portion and the weight of the weight member in the cavity towards the heel portion times the center to center distance between any two of the said adjacent cavities divided by the total weight of the club head.