The present invention relates to the design of golf clubs, and more particularly to the design of iron-type golf club heads and putters.
The significance of improving the mass distribution of golf club heads is well-recognized in the art. For example, perimeter weighting elements in golf club heads are commonly used to increase moment of inertia and thereby provide enhanced resistance to twist, resulting in a more forgiving golf club head in the case of an off-center golf ball impact.
Those skilled in the art have long recognized that a low and rearward center of gravity may provide performance benefits such as a higher launch angle for higher handicapped golfers, as well as improved feel. Some of these benefits have been realized via “undercut” iron-type club heads, i.e. golf club heads with perimeter weighting elements having sole portions with mass concentrated towards the rear thereof, as illustrated in
Furthermore, Golf club heads enhance the golfer's performance most successfully where the golf club head has solid, uninterrupted surfaces, thereby instilling confidence in the player, a key element of golf club performance. Undercut configurations of existing golf club heads do not provide optimal mass distribution with respect to heel-side and toe-side weighting. The existing undercut configurations may interfere with the solid and continuous appearance of the golf club head, resulting in perceived instability and corresponding poor performance.
Undercut configurations of existing perimeter-weighted club heads do not provide adequate mass distribution relative to the heel and toe portions.
Therefore, a need exists for a golf club head which redistributes mass such that optimal performance characteristics are achieved while overcoming the problems previously mentioned herein.
It is an object of the present invention to overcome the above-discussed shortcomings of the prior art.
Such objects and other advantages are achieved by the various embodiments of the present invention, e.g., a golf club head comprising a striking wall having a front surface and a rear surface, a sole portion extending rearwardly from said rear surface, the sole portion having a forward end, a rearward end, an upper surface and a lower surface, with the intersection of the upper surface of the sole portion and the rear surface of the striking wall defining an interior sole line, the intersection of the upper surface of the sole portion and the rearward end surface of the sole portion defining a trailing-edge or exterior sole line, and the upper surface of the sole portion comprising a sink portion having variation in heel-to-toe (HT) contour. The sink portion may comprise a low-order front-to-rear (FR) contour. The inventive golf club head may be an iron-type golf club head including a perimeter weighting element.
The variation in heel-to-toe (HT) contour may comprise variation of at least one of: (a) the vertical height of the trailing edge sole line relative to the vertical height of the interior sole line, measured in the same vertical plane perpendicular to the striking face; (b) the vertical height of the interior sole line relative to the vertical height of the general outer periphery of said golf club head, measured in the same vertical plane perpendicular to the striking face; (c) the vertical height of the trailing edge sole line relative to the vertical height of the general outer periphery of the club head, measured the same in vertical plane perpendicular to the striking face; and (d) concavity as defined by front-to-rear (FR) contour.
The inventive golf club head may further comprise a heel portion and a toe portion with the variation occurring in a variation portion of the upper surface, the variation portion having a heel-most end and a toe-most end, each end being at a HT distance R×D from the centerline of said golf club head, where D is the HT distance from the centerline to the toe-most edge of the club head; and R is a coefficient less than or equal to 0.54.
Additionally, the location of the maximum difference in vertical height between the trailing edge sole line and the interior sole line, measured in the same vertical plane perpendicular to the striking face, may be intermediate the heel-most end and the toe-most end of the upper surface, and the minimum height of the interior sole line relative to the ground plane, measured in the same vertical plane perpendicular to the striking face, may be intermediate the heel-most end and the toe-most end of the upper surface.
Further, the inventive golf club head having a striking wall with a front surface and a rear surface, and a perimeter-weighted portion defined by a rearward surface, an outer surface and an inner surface, where the perimeter-weighted portion comprises a top portion, a sole portion, a heel portion and a toe portion, may additionally comprise an interior perimeter line formed by the intersection of the rear surface and the inner surface, a trailing edge perimeter line formed by the intersection of the inner surface and the rearward surface, the inner surface of the sole portion comprising a sink portion having variation in HT contour; and the interior sole line extending outward of the exterior sole line in at least one of the heel portion, the toe portion, and the top portion.
In yet another embodiment, the inventive golf club head may comprise a heel portion, toe portion, top portion and sole portion, the sole portion having an upper surface, lower surface and rearward surface. The intersection of the upper surface and the rear surface of the striking face may define an interior sole line, the intersection of the upper surface and the rearward surface of the sole defining a trailing edge sole line, the upper surface comprising a sink portion having low-order FR contour and variation in concavity in the HT direction, the concavity defined by the FR contour of the upper surface.
Still other aspects of the present invention are explained below in this specification.
Other objects and further aspects of the present invention will be understood from the following drawings, which include illustrations of preferred embodiments of the advantageous golf club heads of the present invention, wherein:
a) is a cross-sectional view of the club head of
a) is a cross-sectional view of the golf club head of
b) is a rear view of a golf club head of
a) is a cross-sectional view of the golf club head of
b) is a rear view of the golf club head of
c) is a sectional cut away view of a portion of the sole portion of an embodiment of the invention such as that illustrated in
a) is a sectional cut away view of a portion of the sole portion of an embodiment of the invention such as that illustrated in
a)-(c) show cross-sections including the such FR contour at first, second and third imaginary vertical planes A, B, and C, respectively, of
a) is a cross-sectional view of the club head of
b) is a rear view of the club head of
a) is a rear view of a cut away portion of the sole of a golf club head illustrating complementary angles, alpha and beta;
b)-(d) are rear views of a cut away portion of the sole of golf club heads of the present invention illustrating angles alpha and beta whose sum is not 180°;
a) and 29(b) schematically illustrate various HT contours of the sink portion of a club head like that illustrated in
As shown in
A point of inflection may be present in that upper surface intermediate its forward-most and rearward-most ends. An inflection point 218 may be considered mathematically to represent a point on a curve which separates concavity and convexity. An inflection point, as considered herein, may also be expanded to include “kinks,” i.e. points of generally abrupt changes in curvature along the FR contour of the upper surface. The golf club head 210 may be considered to have an inflection-type undercut.
In
The terms trailing edge or exterior sole line used herein refer to a line defined by a set of points lying on the rearward edge of the upper cavity surface of the sole. Such a trailing edge or exterior sole line may not necessarily be a sharp edge or junction of two surfaces.
As shown in
b) shows the trailing edge sole line 434 generally following the HT contour of the outer periphery 411 of the golf club head 410, while the interior sole line 436 varies substantially in HT contour relative to the outer periphery 411 of the golf club head 410. Sink 442 is formed within the sole portion 416.
In
b) is a rear elevation view of the embodiment of the invention shown in
c) shows a sectional cutaway view of a portion of the sole portion 516 of an embodiment of the invention. The upper surface 520 of the sole portion 516 bridges the profiles of the trailing edge sole line 534 and the interior sole line 536.
a) each illustrate an embodiment of the invention comprising a golf club head 610(i) at address position having a sink 642(i). The interior sole line 636(i) forming the sink 642(i) follows a flattened V-shaped path. The HT contour of the interior sole line 636(i) may comprise concave portions.
In
In
a)-(c) illustrate another embodiment of the invention. A golf club head 1010 is shown at address position having a top portion 1022, sole portion 1016, heel portion 1024 and a toe portion 1026. The sole portion 1016 extends rearwardly from a rear surface 1030 of a striking wall 1012. The sole portion 1016 comprises an upper surface 1020, bottom surface 1021 and a rearward end 1048. The intersection between the upper surface 1020 and the rear surface 1030 defines an interior sole line 1036. The intersection between the upper surface 1020 and the rearward end 1048 defines a trailing edge sole line 1034. The HT contour of the trailing edge sole line 1034 is generally parallel to the outer periphery 1011 of the golf club head 1010. The HT contour of the interior sole line 1036 substantially varies with respect to the outer periphery 1011 of the club head 1010 and forms a sink 1042 extending generally throughout the entire HT length of the upper surface 1020. The FR contour of the upper surface 1020 within the sink 1042 varies in the HT direction. At cross-sections A and C, the FR contour of the upper surface 1020 is convex, while at cross-section B, the FR contour of the upper surface 1020 is concave.
A golf club head in accordance with the invention described herein, may further incorporate a means for attenuating vibration associated with the impact of the golf club head with a golf ball. The means for attenuating vibration may take the form of a resilient insert coupled to the rear side of the golf club head. The insert may be coupled by means of an adhesive such as an epoxy, resin, or by mechanical means such as press-fit or mechanical fasteners.
In another embodiment the vibration attenuation means comprises a vibration absorption plaque coupled to the rear surface of the striking face. The plaque may be a constraining layer such as a rigid stress plate comprising a plastic or metallic material such as aluminum. Such vibration absorptive structures are described in Rutin et al. U.S. Pat. No. 5,316,298, the entire disclosure of which is hereby incorporated by reference in the present application.
The plaque may be coupled to the rear surface with a single joining layer such as an epoxy, resin, or a visco-elastic material. The plaque may alternatively be coupled to the rear surface by means of a visco-elastic material sandwiched by two layers of adhesive material such as a double-sided tape. Adhesive material may comprise an epoxy or resin. The exposed surface of the rigid plate may bear indicia such as trademarks.
It is also within the scope of the invention that a perimeter-weighted golf club head may comprise any of the embodiments mentioned herein in combination with at least one secondary recess, opening rearwardly through the rear surface of the top or top rail portion. A top rail having secondary recesses therein may still provide structural support for the top rail portion of a golf club head while permitting additional mass to be redistributed to other portions of the golf club head, particularly to the sole portion.
An insert 1154 is juxtaposed with the upper surface 1120 and the rear surface 1130 of the striking wall 1112. A first peripheral rib 1156 encircles the insert 1154. The insert 1154 may be coupled to the sole portion 1116, the rear surface 1130 or both. The coupling means may be an adhesive such as epoxy, resin, tape, or visco-elastic material or mechanical means such as press-fit or fasteners. A visco-elastic plaque 1152 may be attached to the rear surface 1130 of the striking wall 1112 and may comprise a second peripheral rib 1158 encircling the visco-elastic plaque 1152. As an alternative, the plaque 1152 may be inserted into a re-entrant recess extending forwardly from the rear surface 1130 of the striking wall 1112. The top portion 1122 further comprises a plurality of secondary recesses 1150 opening rearwardly through the rear surface of the top rail portion. The secondary recesses 1150 permit redistribute of mass to a lower location.
The golf club head of the current invention may primarily be comprised of any material conventional to golf club head manufacture, such as steel, non-ferrous metallic alloys, titanium, aluminum, composites, plastics, rubbers, and the like. Preferably, the golf club head of the current invention comprises a relatively low density ferrous metal. More preferably, the ferrous metal comprises ductile iron and has a density within the range of about 5 to about 7.4 g/cm3.
The embodiments discussed herein may be further combined with other known elements such as resilient inserts including polymers such as rubbers and polyurethane, silicone, metallic inserts including copper, tungsten, aluminum, titanium, steel, and bi-metallic combinations of the above and other metals. It is also intended that embodiments of the invention described herein may be combined with other structural elements known in the art, such as ribs, web portions, swing weights or plaques.
In all embodiments of the invention described herein, the HT contour of the interior sole line within each sink may be described as being continuously variant. Continuously variant includes curvilinear contours or contours comprising a set of corners having angles such that in the case of the interior sole line having less than five corners, no two adjacent corner angles may be supplementary, that is totaling up to 180 degrees.
a) illustrates a cutaway rear view of a sole portion of a golf club head in which angle α and angle β are adjacent and add up to 180 degrees by virtue of angles α and β being alternate interior angles.
Those skilled in the art of golf club head design will appreciate that minor changes in the shapes of the various elements and surfaces of the club heads of the present invention may be made within the ambit of the present invention without departing from the scope and spirit of the invention, which is defined by the following claims:
The present application is a continuation of application Ser. No. 13/200,758, filed Sep. 30, 2011, which is a continuation of application Ser. No. 12/929,559, filed Feb. 1, 2011, now U.S. Pat. No. 8,075,419, which is a continuation of application Ser. No. 12/801,477, filed Jun. 10, 2010, now U.S. Pat. No. 7,901,298, which is a continuation of application Ser. No. 12/461,614, filed Aug. 18, 2009, now U.S. Pat. No. 7,789,772, which is a continuation of application Ser. No. 11/196,413, filed Aug. 4, 2005, now U.S. Pat. No. 7,594,864, and claims priority of U.S. Provisional Patent Application Ser. No. 60/598,897, filed Aug. 5, 2004, the entirety of the disclosure of which is hereby incorporated by reference into the present application.
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PGA.com Value Guide, the National Standard for Golf Club Values—Callaway Golf Steelhead X16 Iron Set golf club, info and specs found at: http://valueguide.pga.com/detail-exec/brand/2675/product—type/205/model/44582/b/ Callaway/p/Iron%20set/m/Steelhead%20X-16. |
PGA.com Value Guide, the National Standard for Golf Club Values—Callaway Golf Steelhead X16 Pro Series Iron set Graphite Shaft, info and specs found at: http://valueguide.pga.com/detail-exec/brand/2675/product—type/205/model/44583/b/Callaway/p/Iron%20set/m/Steelhead%20X-16%20Pro%20Series. |
PGA.com Value Guide, the National Standard for Golf Club Values—Callaway Golf Hawk Eye Iron set Graphite Shaft, info and specs found at: http://valueguide.pga.com/detail-exec/brand/2675/product—type/205/model/44077/b/Callaway/p/Iron%20set/m/Hawk%20Eye. |
PGA.com Value Guide, the National Standard for Golf Club Values—Callaway Golf Hawk Eye VFT Iron set gold club, info and specs found at: http://valueguide.pga.com/detail-exec/brand/2675/product—type/205/model/44079/b/Callaway/p/Iron%20set/m/Hawk%20Eye%20VFT. |
Number | Date | Country | |
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20120283038 A1 | Nov 2012 | US |
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60598897 | Aug 2004 | US |
Number | Date | Country | |
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Parent | 13200758 | Sep 2011 | US |
Child | 13548744 | US | |
Parent | 12929559 | Feb 2011 | US |
Child | 13200758 | US | |
Parent | 12801477 | Jun 2010 | US |
Child | 12929559 | US | |
Parent | 12461614 | Aug 2009 | US |
Child | 12801477 | US | |
Parent | 11196413 | Aug 2005 | US |
Child | 12461614 | US |