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US 6,428,426 B1Granted
Golf club striking plate with variable bulge and roll
AssigneeCallaway Golf Company
InventorsRichard C. Helmstetter, Roger C. Cleveland, D. Clayton Evans, Garth W. Smith
Life of this patent
Estimating the term…
Abstract
A golf club head having a striking plate with variable roll radius of curvature and a variable bulge radius of curvature is disclosed herein. The striking plate preferably has a large surface area which requires correction of off-center shots. The striking plate may be used on a fairway wood-type golf club head or a driver-type golf club head. The striking plate is preferably composed of steel or titanium.
Claims25
A wood-type golf club head comprising:
- a body having a crown, a sole, a striking plate, a heel end and a toe end, the body having a hollow interior and a volume greater than 300 cubic centimeters, the striking plate partitioned into an upper toe quadrant, a lower toe quadrant, an upper heel quadrant and a lower heel quadrant, the striking plate having a first roll radius along a vertical mid-area that divides the upper heel quadrant from the upper toe quadrant and divides the lower heel quadrant from the lower toe quadrant, the striking plate having a second roll radius along an upper toe quadrant or a lower heel quadrant, the second roll radius unequal to the first roll radius.
A wood-type golf club head comprising:
- a body composed of a titanium alloy and having a volume greater than 300 cubic centimeters, the body having a crown, a sole and a striking plate, the striking plate partitioned into an upper toe quadrant, a lower toe quadrant, an upper heel quadrant and a lower heel quadrant, the striking plate having a first bulge radius along a horizontal mid-area that divides the upper toe quadrant from the lower toe quadrant and divides the upper heel quadrant from the lower heel quadrant, the striking plate having a first roll radius along a vertical mid-area that divides the upper toe quadrant from the upper heel quadrant and divides the lower toe quadrant from the lower heel quadrant, the striking plate having a second bulge radius along the upper toe quadrant and a third bulge radius along the lower heel quadrant wherein the first bulge radius, the second bulge radius and the third bulge radius are all unequal, the striking plate having a second roll radius along the upper toe quadrant and a third roll radius along the lower heel quadrant, wherein the first roll radius, the second roll radius and the third roll radius are all unequal.
A wood-type golf club head comprising:
- a body composed of a titanium alloy and having a volume greater than 300 cubic centimeters, the body having a crown, a sole and a striking plate, the striking plate partitioned into an upper toe quadrant, a lower toe quadrant, an upper heel quadrant and a lower heel quadrant, the striking plate having a core face area of the striking plate has an area between 4.80 square inches and 5.20 square inches, the striking plate having
- a first roll radius along a vertical mid-area of the striking plate;
- a second roll radius along an upper toe quadrant of the striking plate;
- a third roll radius along a lower heel quadrant of the striking plate;
- a first bulge radius along a horizontal mid-area of the striking plate;
- a second bulge radius along an upper toe quadrant of the striking plate;
- and
- a third bulge radius along a lower heel quadrant of the striking plate.
5 more elements
Dependencies are inferred from the claim text.