Abstract:
The present invention entails a golf club head having a face, back sole and a leading edge extending between the sole and the face. The sole is shaped such that there are three distinct and separate Surfaces defined thereon. There is an intermediate surface formed on the sole that forms a plateau. On each side of the intermediate plateau there is defined on the sole an outer surface area. One outer surface area breaks away from the plateau and extends generally upwardly towards both the leading edge and the heel of the club. The other outer surface breaks away from the plateau and extends generally upwardly towards the leading edge and the toe area of the club.

Description:
FIELD OF INVENTION 
     The present invention relates to golf club heads and more particularly to a golf club head having a sole that includes a plurality of distinct surfaces designed to reduce drag or resistance. 
     SUMMARY OF THE INVENTION 
     Attempts at designing golf club heads that reduce drag and resistance are well-documented in the prior art. Drag and resistance come into play, for example, when the club head is swung through rough, tall grass or when the club head is brought into contact with the turf or ground. In attempting to reduce drag and resistance, one needs to be mindful of the shape of the leading edge and the surface of the sole extending away from the leading edge. This is because it is the leading edge and the adjacent area of the sole that typically comes in contact with sand, rough, tall grass and the turf or ground as the club head approaches and makes impact with the golf ball. 
     The present invention presents a golf club head having a face, back, sole, leading edge, toe area and heel area wherein the sole includes an intermediate surface and two flanking outer surfaces. First, the sole assumes a generally curve shape such that the two outer surfaces are elevated with respect to the intermediate surface. The intermediate surface forms a plateau on the sole and the two outer surfaces break away from the plateau and are inclined generally upwardly towards the leading edge. In addition, both outer surfaces are inclined generally outwardly with respect to the golf club head such that the surface adjacent the heel area inclines generally upwardly towards the heel area while the surface adjacent the toe area inclines generally upwardly towards the toe area. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a front elevational view of the golf club head of the present invention. 
     FIG. 2 is a back elevational view of the golf club head. 
     FIG. 3 is a plan view of the sole of the golf club head. 
     FIG. 4 is a sectional view taken through the line 4--4 of FIG. 1. 
     FIG. 5 is a sectional view taken through the line 5--5 of FIG. 1. 
     FIG. 6 is a sectional view taken through the line 6--6 of FIG. 1. 
     FIG. 7 illustrates the face angle formed by the face of the golf club head and the sole at an area adjacent the toe portion of the golf club head. 
     FIG. 8 illustrates the face angle formed by the face of the golf club head and the sole of the head at an intermediate area of the head. 
     FIG. 9 illustrates the face angle formed by the face and sole of the golf club head at an area adjacent the heel area of the golf club head. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     With further reference to the drawings, the golf club head of the present invention is shown therein and indicated generally by the numeral 10. Golf club head 10 includes a face 12, back 14, heel area 16, and toe area 18. 
     Formed about the bottom of the head 10 is a sole. The sole forms the bottom of the club head and generally extends between the heel area 16 and toe area 18. The sole of the golf club head 10 includes a series of distinct areas or surfaces. As illustrated in FIG. 3, the sole includes an intermediate surface 24 that is generally flat and as illustrated in FIG. 5, angles generally upwardly towards the back 14 of the golf club head 10 relative to the face 12 (FIG. 5). Disposed on opposite sides of the intermediate surface 24 is two other distinct surfaces referred to as outer surfaces 26 and 28. As indicated in FIG. 3, outer surface 26 is disposed adjacent the toe area 18 of the club head 10 while outer surface 28 is disposed adjacent the heel area 16 of the club head 10. 
     As seen in the drawings, the sole, comprised of the surfaces 24, 26 and 28 just described, lies between a leading edge 20 and a rear edge 22. As seen in FIGS. 1 and 3, the leading edge 20 is an edge defined by the intersection of face 12 and the front portion of the sole. The rear edge 22 refers to the rear edge of the sole. 
     As noted above, the intermediate surface 24 and the outer surfaces 26 and 28 formed on the sole are distinct areas as the outer surfaces 26 and 28 do not lie in the same plane as the intermediate surface 24 but rather form distinct and discrete surfaces relative to the intermediate surface 24. In particular, the intermediate surface 24 forms a plateau on the sole. As the club 10 is oriented in FIGS. 1 and 2, the plateau of the intermediate surface 24 is disposed at a lower elevation than the outer surfaces 26 and 28. Outer surfaces 26 and 28 break away and extend from the plateau of the intermediate surface 24. For example, outer surface 26 is angled upwardly towards the leading edge 20 relative to the intermediate surface 24. At the same time, outer surface 26 is angled upwardly and outwardly towards the toe area 18 of the golf club head 10. Likewise, outer surface 28 is angled upwardly towards the leading edge 20 relative to the intermediate surface 24. Also, outer surface 28 is angled upwardly and outwardly from the intermediate surface 24 towards the heel area 16. 
     In the embodiment illustrated in FIG. 3, the intermediate surface 24 and the outer surfaces 26 and 28 of the sole are defined by and separated by a demarcation line 30. Demarcation line 30 extends from an area adjacent the rear edge 22 of the sole towards the leading edge 20 and generally curves across an area adjacent the leading edge 20 before the demarcation line 30 turns back and proceeds towards the rear edge 22 of the sole. Thus, it is seen in FIG. 3 that the intermediate surface 24 defined by the demarcation line 30 is of a generally U-shape. While the demarcation line 30 may be evident in the embodiment illustrated herein, it is contemplated that the sole of the golf club 10 with its respective distinct surfaces could be formed without the demarcation line 30 being evident or quite so evident as it is in the case of the design illustrated herein. 
     Leading edge 20, as seen in FIG. 1, is generally arcuate shaped and is consistent with the property of the two outer surfaces 26 and 28 being elevated with respect to the intermediate surface 24. Rear edge 22 of the sole also is at least slightly non-linear as it curves generally upwardly with the outer surfaces 26 and 28. In addition, the rear edge 22 of the sole includes a cut-out portion 22a disposed adjacent the rear or trailing edge of the intermediate surface 24. 
     The sole and face 12 of the golf club head 10 form what is referred to as a face angle. In the case of the golf club head 10, the face angle varies as one moves from the heel area 16 to the toe area 18. 
     FIG. 5 illustrates a cross-sectional view of the golf club head 10 taken through the line 5--5 of FIG. 1. It is appreciated that this cross-sectional view is taken generally midway through the intermediate surface 24 of the sole. (In FIGS. 4, 5 and 6, G represents a reference or ground line). The face angle for this portion of the club head is illustrated by angle A in FIG. 8. Note that the face angle is formed by a construction line that is extended in co-planer relationship with the face 12 of the club and a second construction line that is extended from the sole generally tangential to the surface of the sole at an area adjacent the leading edge 20. 
     Now, turning to the face angles formed by the outer surfaces 26 and 28 of the sole, reference is made to FIGS. 4, 6, 7 and 9. Note that FIGS. 4 and 7 illustrate the outer surface 26 disposed adjacent the toe area 18 while FIGS. 6 and 9 illustrate the outer sole surface 28 disposed adjacent the heel area 16. In both cases, as illustrated in FIGS. 7 and 9, the face angles B and C are greater than the face angle A illustrated in FIG. 8. This is because in both cases, the outer surfaces 26 and 28 are inclined upwardly towards the leading edge 20 of the club relative to the intermediate surface 24. 
     Below in Table I is a summary of the face angles for angles A, B and C for a set of irons and wedges. Note that in the case of each club, that both face angles B and C exceed face angle A. As one proceeds from the 2 iron to the lob wedge, it is seen that the angle differential between face angle A and face angle B or C generally increases. 
     
                       TABLE I______________________________________CLUB     FACE ANGLE B                FACE ANGLE A                            FACE ANGLE C______________________________________2 iron   85°  72°  86°3 iron   85°  69°  85°4 iron   80°  66°  80°5 iron   80°  62°  80°6 iron   77°  60°  77°7 iron   77°  60°  77°8 iron   75°  57°  75°9 iron   74°  53°  70°picking wedge    72°  53°  70°sand wedge    70°  49°  64°lob wedge    64°  43°  55°______________________________________ 
    
     As illustrated in FIGS. 7, 8 and 9, and in Table I, both face angles B and C are greater than face angle A which as pointed out previously represents the face angle in the area occupied by the intermediate surface 24. It is contemplated that in a preferred embodiment, that the face angles B and C would exceed the face angle A by approximately 13° to 21°. 
     By providing a sole for golf club head 10 according to the present invention, drag and resistance is reduced. In particular, outer surfaces 26 and 28 are elevated with respect to the intermediate surface 24 and consequently this reduces drag induced by the club as the same is swung through heavy, rough or tall grass. Likewise, the specific orientation and angling of the outer surfaces 26 and 28 tend to prevent the club from digging downwardly extensively into the turf or the ground. In fact, the outer surfaces 26 and 28 can be referred to as bounce angles as their particular orientation and disposition with respect to the intermediate surface 26 and to the golf club head 10 in general, tends to encourage the club to bounce or deflect away from the turf or ground as opposed to continuing into and through the turf or ground. 
     In forming the surfaces 26 and 28 (referred to as bounce angles) one is able to effectively remove weight from the sole of the golf club head. This weight can then be redistributed to other portions of the club head, forming a more solid club head and a more efficient use of weight. 
     The present invention may, of course, be carried out in other specific ways than those herein set forth without parting from the spirit and essential characteristics of the invention. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.