Golf driver with variable weighting for changing center of gravity

DETAILED DESCRIPTION OF THE INVENTION Referring now to the Figures, a preferred embodiment of the invention is illustrated.
The club head is made in a casting and has a face plate 11 which is affixed to such casting by suitable means such as welding.
Formed in the casting immediately behind the face plate are a pair of tubular chambers 12 and 14 which run substantally the entire horizontal extent of the face plate and are substantially parallel to each other.
A cap 12a and 14a is respectively provided for each of the chambers, these caps threadably attaching to their associated chamber walls.
A plurality of cylindrical weight members 16 are provided, these weight members all being the same size.
Three of such weight members are installed in each chamber at a time.
A plurality of sets of such weight members are provided, each set including three such members and being made of a material having a different density.
In the prefered embodiment three sets of such weights are provided , a first set being of aluminum(density-2.
70), a second set being made of brass(density-8.
50), and the third set being of lead(density-11.
34).
The weight of the club head is typically 145-170 grams(without the weights inserted) and the center of gravity is typically located between chambers 12 and 14 and equidistant from the toe and heel of the head(without weights inserted).
The chambers typically have inner diameters of 7.
5-10 mm and lengths of 48-58 mm.
The weights 16 have outer diameters corresponding to the inner diameters of the chambers and lengths of 16-19.
3 mm.
The club head casting is typically made of stainless steel.
As noted above, a great variety of different combinations of the weights can be used to provide a great variety of different centers of gravity for the club head.
It is estimated that over 700 variations in center of gravity can be attained with the three sets of weights described above.
To facilitate the use of the weights by the golfer, a table can be provided to indicate the expected effects on loft angle and slice and hook which will be influenced with various combined arrangements of the weights in the chambers to provide shifts in the center of gravity upwardly and downwardly and to the right and left