Games using tangible projectile – Golf – Club or club support
Reexamination Certificate
2000-02-03
2001-10-30
Passaniti, Sebastiano (Department: 3711)
Games using tangible projectile
Golf
Club or club support
Reexamination Certificate
active
06309310
ABSTRACT:
BACKGROUND OF THE INVENTION
It is well known in the golf industry that balls hit from a driver or fairway wood should have a backspin rate adequate to create a stable flight pattern, but not so high as to cause excessive climbing of the ball to the point where roll and distance are sacrificed. An ideal trajectory can be created with a spin rate of approximately 1800 rpm. A spin rate of 3000 rpm, for example, will create a very high trajectory and a serious loss of distance. On the other hand, a very low spin rate, for example under 500 rpm, creates an unstable flight and very short total shot distances.
Current methods of creating the desired trajectory include 1) raising or lowering the center of gravity of the club head; 2) creating a low friction face, even to the extent of the elimination of grooves; and 3) reducing the loft of the club face. It has been proven that the first and third techniques work for professional and very low handicap amateurs but not well for the average mid to high handicap golfer. Method 2 gworks for the average player when golfing conditions are perfect but when the ball or club face are wet, thus producing low friction, mis-hits on the toe or heel of the club result in wild and unpredictable shots due to loss of the desired and well known gear effect. Spin rates in the center of the low friction faces are still under control in wet weather even through the spin rate is reduced.
BRIEF SUMMARY OF THE INVENTION
The problem set forth above can be eliminated by providing vertical grooves on the face of the golf club head. If the entire face of the golf club head is provided with vertical grooves, these grooves will not influence ball spin and flight in the center of the club head but will create the necessary friction and side spin to enhance the desired gear effect when balls are hit on the toe and heel of the club. Alternatively, it is possible to have horizontal grooves in the center of the club face and vertical grooves on both ends of the club face and thus, obtain the same desired result.
It is therefore an object of this invention to provide a golf club head having a ball striking surface and providing vertical grooves thereon which will create the necessary friction and side spin to enhance the desired gear effect when balls are hit on the toe and the heel of the club.
This, together with other objects of the invention, will become apparent from the following detailed description of the invention and the accompanying drawings.
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Carbite, Inc.
Gray John L.
Passaniti Sebastiano
Williams Shawnell
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