Abstract:
The present invention relates to a metal wood golf club and golf club head, in which the golf club head includes a flat triangular torsion stabilizing surface raised from the sole, wherein the base of the flat triangular shaped torsion stabilizing surface is located toward the back of the sole and the vertex is located toward the front of the sole. Additional features are combined with the torsion stabilizing surface to provide a golf club having truer performance.

Description:
FIELD OF THE INVENTION 
   This invention relates generally to a golf club. In particular this invention relates to a metal wood type golf club having a torsion stabilizing surface on the sole of the golf club head. 
   BACKGROUND 
   Wood type golf clubs are used for hitting the ball off the tee, from the fairway, or possibly from the rough or a hazard. The type of golf club chosen by a golfer for a particular shot depends on the shot desired and the condition of the ball&#39;s lie. For example, a driver is generally used for tee shots and fairway woods are generally used for hitting the ball from the fairway or rough. A tee shot generally involves hitting the ball from an elevated position and fairway and rough shots involve hitting the ball from the ground. The various functional aspects of the soles of these clubs can be optimized to minimize any deleterious conditions the club head may experience during the swing. 
   The faster a club head is moving when it comes in contact with the ball, the farther the ball will travel. Any contact with the ground during a swing prior to contact with the ball slows down the speed of the club head and decreases the distance the ball will travel. Further, when a club head strikes an imperfect surface, i.e., the ground, the trajectory of the club head can be altered with deleterious effect on the resultant trajectory of the ball. When striking a ball from an elevated tee, a golfer is generally able to prevent the club head from hitting the ground. However, when striking a ball positioned on the ground, the club head will often strike the ground during the swing. Thus, it is preferred that a club head be optimized for both aerodynamics and to minimize frictional losses to club head speed and alterations to the club head&#39;s trajectory caused by ground contact. By maximizing club head speed and minimizing alterations to the club head&#39;s trajectory, a true shot may be hit that will travel farther and straighter than otherwise possible. 
   The deleterious effect that making contact with the ground has on a golf shot often causes golfers to have low confidence as they approach a ball with an imperfect lie. Hitting a ball “fat” or “duffing,” as mentioned above, results in a short and potentially errant shot. The fear of “duffing” often causes golfers to unconsciously pull up during their swing resulting in a “topped” shot, which occurs when only the top portion of the ball is struck. As neither topping nor duffing is desirable, a golf club that minimizes the effects of a duffed shot would enable a golfer to approach a ball with confidence thereby preventing topped shots. 
   SUMMARY OF THE INVENTION 
   The claimed invention relates to a golf club comprising a head, a shaft, and a grip. The head of the metal wood type golf club comprises a face, a sole, a back, and a hosel. A flat triangular torsion stabilizing surface is raised from the surface of the sole. The base of the triangular torsion stabilizing surface is located toward the back and the vertex of the triangular torsion stabilizing surface is blunted and is located at about the center of the sole toward the face. The leading edge of the sole is angled down and away from the face. The loft angle of the face is about 21 degrees. The weight of the head is distributed disproportionately toward the sole. The hosel is offset. The shaft of the metal wood type golf club is shorter than a conventional fairway wood. 
   Another aspect of the present invention relates to a golf club head comprising a face, a sole, a back, and a hosel. A flat triangular torsion stabilizing surface is raised from the surface of the sole. The base of the triangular shaped torsion stabilizing surface is located toward the back and the vertex of the triangular torsion stabilizing surface is located toward the face. 
   The golf club head can be a wood type golf club head. The front of the triangular torsion stabilizing surface can be blunted. The vertex of the flat, torsion stabilizing surface can be located at about the center of the sole toward the face. The leading edge of the sole can be angled down and away from the face. The loft angle of the face can be between 18 and 24 degrees. The weight of the club head can be distributed disproportionately toward the sole. The hosel of the club head can be offset. A shaft can be connected to the golf club head. The shaft connected to the golf club head can be shorter than a conventional fairway wood. The shaft can be between 36 and 41 inches long. The diameter of the shaft can be between 0.340 and 0.365 inches at the hosel. The torsion stabilizing surface can be raised a substantially equal amount above the sole around its periphery. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS FIGURES 
       FIG. 1  is a perspective view of a golf club head according to the present invention; 
       FIG. 2  is a bottom plan view of a golf club head according to the present invention; 
       FIG. 3  is a rear view of a golf club head according to the present invention; 
       FIG. 4  is a front view of a golf club head according to the present invention; 
       FIG. 5  is a view from the heel of a golf club head according to the present invention; and 
       FIG. 6  is a view from the toe of a golf club head according to the present invention. 
   

   DETAILED DESCRIPTION 
   Referring now to the drawings, the invention will be described in more detail. 
     FIGS. 1-6  illustrate one embodiment of a golf club head  10  in accordance with the present invention. The club head  10  comprises a top portion  12 , a sole portion  14 , a back portion  16 , a ball striking face  18 , and a shaft receiving portion or hosel  20  extending generally from the top portion  12  of the club head  10  at the heel  22 . The torsion stabilizing surface  24  is attached to the sole portion  14 . The torsion stabilizing surface  24  is integrally molded within the sole portion  14  forming a unitary piece. 
   The torsion stabilizing surface  24  is elevated from the surface of the sole portion  14  of the club head  10 . The torsion stabilizing surface  24  is flat, i.e., it is relatively smooth and even without any peaks or depressions. A logo may be lightly engraved or otherwise placed on the raised flat portion of the torsion stabilizing surface  24 , if so desired. The torsion stabilizing surface  24  adopts the curvature of the sole portion  14  and the surface of the torsion stabilizing surface  24  remains generally parallel to and equidistant from the surface of the sole portion  14 . The base  26  of the triangle forming the torsion stabilizing surface  24  merges with the back portion  16  of the club head  10 . The vertex  28  of the triangle forming the torsion stabilizing surface  24  is positioned to ward the center of the front of the sole portion  14  behind the ball striking face  18 . 
   The angled front section  30  of the sole portion  14  is angled forwardly and upwardly as depicted in  FIGS. 5-6  from a point toward the front of the sole portion  14  until the sole portion  14  merges at a common boundary with the ball striking portion  18 . By being angled forwardly and upwardly, the angled front section  30  of the sole portion  14  acts to lift the club head  10  off the ground once contact is made between the ground and the sole portion  14  during a golfer&#39;s swing, thereby, minimizing frictional contact between the club head  10  and the ground. The ground as thereby, minimizing frictional contact between the surfaces encountered while playing golf such as, for example, turf, grass, sand, leaves, or pine needles, among other surfaces. 
   The vertex  28  of the triangle forming the torsion stabilizing surface  24  is blunted and forms a forward edge  32  of the torsion stabilizing surface  24  that slopes away from the torsion stabilizing surface  24  toward the ball striking portion  18  to merge with the angled front section  30  of the sole portion  14 . The blunted forward edge  32  of the raised triangular shaped torsion stabilizing surface  24  can be angled more shallowly than the heel edge  34  and toe edge  36  of the torsion stabilizing surface  24  to efficiently merge with the angled front section  30  of the sole  14 . The heel edge  34  and the toe edge  36  of the torsion stabilizing surface  24  slope away from the raised, flat surface of the torsion stabilizing surface  24  and merge with the sole portion  14  toward the heel  22  and toe  38  of the club head respectively. The heel edge  34  and toe edge  36  of the torsion stabilizing surface  24  stabilize the club head  10  trajectory as the club head  10  contacts the ground during a swing by providing equal and opposite, i.e., balancing, forces. The equal forces acting on either side of the torsion stabilizing surface  24  counteract each other leaving a trajectory that is consistent with the trajectory before the sole made contact with the ground. 
   Additional features of the club head  10  of this embodiment of the present invention include a unique loft angle, a disproportionate weight distribution, and an offset hosel  20 . The loft angle of the club head  10  of this embodiment of the present invention is 21 degrees whereas the loft angle of a conventional seven wood is 20 degrees and the loft angle of a conventional five wood is 17-18 degrees. The increased loft angle of the club head  10  of this embodiment of the present invention over conventional five and seven woods produces greater height for a given golf shot as compared to a conventional five or seven wood. The loft angles of additional embodiments of the club head  10  of the present invention can be between about 18 and 24 degrees, preferably between about 19 and 23 degrees, and more preferably between about 20 and 22 degrees. The weight of the club head  10  of this embodiment of the present invention is disproportionately distributed toward the sole portion  14  in order to lower the center of gravity. A lower center of gravity of the club head  10  of this embodiment of the present invention positions the weight of the club head closer to where the ball is normally struck on the ball striking face  18  from a position on the ground. The hosel  20  of the club head  10  of this embodiment of the present invention is offset forward of the ball striking face  18 . Offsetting the hosel  20  in this manner minimizes pushing or slicing, as known by those of skill in the art. 
   A second embodiment of the present invention is a men&#39;s golf club utilizing a golf club head with a raised torsion stabilizing surface on its sole. In addition to the golf club head  10 , as discussed above, the golf club comprises a grip and a shaft  40  (not shown). The grip can be any type of grip that is commercially or otherwise available. The shaft  40  of the men&#39;s golf club of this embodiment of the present invention is about 39 inches long. The shaft lengths of additional embodiments of the present invention can be between about 37 and 41 inches long, and preferably between about 38 and 40 inches long. The shaft of an average men&#39;s seven wood is 41.5-42 inches long. The shorter 39 inch shaft  40  of the present embodiment allows the golfer to position himself closer to the ball during setup. Being closer to the ball during set up allows the golfer to adopt an athletic stance providing greater confidence and a more controlled swing. Greater confidence, a more athletic stance, and a more controlled swing reduce the potential that a golfer will top the ball. The lie angle of the golf club head  10  is set relative to the shaft length to allow the golf club head  10  to properly address the ball. 
   An additional feature of the shaft  40  of this embodiment of the present invention is the diameter of the shaft  40  at the point where the shaft  40  enters the hosel  20 . When a club head strikes a ball, or the ground, the end of the club head opposite the end of the club head attached to the shaft, i.e., the toe, tends to twist, or torque, away from the end of the club head attached to the shaft, i.e., the heel. As any change in the orientation of a club head during the golfer&#39;s swing will cause deleterious effects in the resultant golf shot, minimizing torque when a club head contacts the ball or the ground will increase a club&#39;s ability to hit true shots. This torquing action tends to occur partially within the shaft  40  itself and partially at the golfer&#39;s hold on the club grip. Because the twisting occurs partially within the shaft  40  a golfer cannot alleviate all torquing action by gripping the club more firmly. A conventional iron type club has a shaft diameter at the hosel of 0.375 inches and the shaft diameter at the hosel of a conventional wood type club is 0.330 inches. The greater shaft diameter of a conventional iron as compared to a conventional wood reduces torque within the shaft. The diameter of the shaft  40  of this embodiment of the present invention at the hosel  20  is about 0.350 inches. By increasing the diameter of the shaft  40  at the hosel  20  of this embodiment of the present invention, torque within the shaft  40  is minimized as compared to a conventional wood type club. The diameters of the shafts  40  of additional embodiments of the present invention at the hosel  20  can be between about 0.340 and 0.365 inches, and preferably between about 0.345 and 0.355 inches. The increased shaft diameter at the hosel  20  of the present invention, as compared to a conventional wood type club, reduces torque thereby increasing the ability of the club of the present embodiment to hit a true shot. 
   A third embodiment of the present invention is a ladies&#39; golf club utilizing a golf club head with a raised torsion stabilizing surface on its sole. In addition to the golf club head  10 , as described above, the ladies&#39; golf club embodiment of the present invention comprises a grip and a shaft  40  (not shown). The grip can be any type of grip that is commercially or otherwise available. The shaft  40  of the ladies&#39; golf club of this embodiment of the present invention is about 38 inches long. The shaft lengths of additional embodiments of the present invention can be between about 36 and 40 inches long, and preferably between about 37 and 39 inches long. The shaft of an average ladies&#39; seven wood is 40.5-41 inches long. The shorter 38 inch shaft  40  of the present embodiment allows the golfer to position herself closer to the ball during setup. Being closer to the ball during set up allows the golfer to adopt an athletic stance providing greater confidence and a more controlled swing. Greater confidence, a more athletic stance, and a more controlled swing reduce the potential that a golfer will top the ball. The lie angle of the golf club head  10  is set relative to the shaft  40  length to allow the golf club head  10  to properly address the ball. 
   Similar to the men&#39;s golf club embodiment of the present invention, an additional feature of the shaft  40  of this embodiment of the present invention is the diameter of the shaft  40  at the point where the shaft  40  enters the hosel  20 . The torquing problem in the shaft of a ladies club is the same as that explained with respect to the men&#39;s club embodiment. The diameter of the shaft  40  of this embodiment of the present invention at the hosel is 0.350 inches. The diameters of the shafts  40  of additional embodiments of the present invention at the hosel can be between about 0.340 and 0.365 inches, and preferably between about 0.345 and 0.355 inches. 
   While various features of the claimed invention are presented above, it should be understood that the features may be used singly or in any combination thereof Therefore, the claimed invention is not to be limited to only the specific embodiments depicted herein. 
   Further, it should be understood that variations and modifications may occur to those skilled in the art to which the claimed invention pertains. The embodiments described herein are examples of the claimed invention. The disclosure may enable those skilled in the art to make and use embodiments having alternative elements that likewise correspond to the elements of the invention recited in the claims. The intended scope of the invention may thus include other embodiments that do not differ that insubstantially differ from the literal language of the claims. The scope of the present invention is accordingly defined as set forth in the appended claims. 
   Additionally, while this invention has been discussed mainly in the context of a wood type golf club and club head, this invention is not limited to use on wood type golf clubs and may be used on any wood type golf club or iron type golf club.