US20020019267A1 - Golf club head that optimizes products of inertia - Google Patents
Golf club head that optimizes products of inertia Download PDFInfo
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- US20020019267A1 US20020019267A1 US09/916,374 US91637401A US2002019267A1 US 20020019267 A1 US20020019267 A1 US 20020019267A1 US 91637401 A US91637401 A US 91637401A US 2002019267 A1 US2002019267 A1 US 2002019267A1
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- golf club
- club head
- inertia
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- moment
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/02—Joint structures between the head and the shaft
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B53/0408—Heads characterised by specific dimensions, e.g. thickness
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B53/0416—Heads having an impact surface provided by a face insert
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B53/0437—Heads with special crown configurations
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B53/0466—Heads wood-type
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
- A63B60/02—Ballast means for adjusting the centre of mass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
- B29C70/865—Incorporated in coherent impregnated reinforcing layers, e.g. by winding completely encapsulated
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B2053/0491—Heads with added weights, e.g. changeable, replaceable
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2209/00—Characteristics of used materials
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2209/00—Characteristics of used materials
- A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B53/0408—Heads characterised by specific dimensions, e.g. thickness
- A63B53/0412—Volume
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B53/0433—Heads with special sole configurations
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
- A63B53/04—Heads
- A63B53/0458—Heads with non-uniform thickness of the impact face plate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
- B29L2031/5227—Clubs
Definitions
- the present invention relates to a large volume golf club head that optimizes the products of moments of inertia. More specifically, the present invention relates to a large volume golf club head that has large moments of inertia with small absolute values for the products of inertia.
- the products of inertia relate moments about one axis with head rotations about another axis. These head rotations in turn cause vertical or horizontal gear effect that impart increased or reduced backspin and draw or fade spin to a golf ball. Unlike the spins generated by conventional gear effect associated with Iyy and Izz, these spins cannot be compensated for by adjusting the face bulge radius and the face roll radius. As club heads become larger than 300 cc, and moments of inertia become larger, Izz greater than 3000 grams centimeter squared and Iyy greater than 1800 grams, there is a propensity for the products of inertia to also become larger. As the products of inertia become larger, there is a deleterious effect on dispersion.
- the present invention provides a large volume golf club head with high moments of inertia that has smaller products of inertia.
- the golf club head of the present invention provides all of the advantages of large volume golf club heads with large moments of inertia, such as greater confidence and greater distance, without the attendant increase in dispersion.
- off-center hits have greater distance and increased straightness with the golf club head of the present invention, which results in more consistent golf ball flight and improved accuracy for the golfer.
- One aspect of the present invention is a golf club head including a body having a crown, a sole and a striking plate.
- the body has a hollow interior.
- the golf club head has a volume ranging from 300 cubic centimeters (“cm 3 ”) to 600 cm 3 .
- Each of the products of inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 grams-centimeter squared (“g-cm 2 ”).
- Another aspect of the present invention is a high moment of inertia golf club head having a body composed of a crown, a sole and a striking plate.
- the body has a hollow interior.
- the golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm 2 to 5000 g-cm 2 .
- the golf club head also has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm 2 to 2050 g-cm 2 .
- Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm 2 .
- Another aspect of the present invention is a golf club head having a body composed of a titanium alloy material and having a mass less than 250 grams (“g”).
- a plurality of weight members having a mass of less than 85 g are disposed within a hollow interior of the body.
- the golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm 2 to 5000 g-cm 2 .
- the golf club head has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm 2 to 2050 g-cm 2 .
- Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm 2 .
- Another aspect of the present invention is a golf club head having a body composed of a steel alloy material and having a mass less than 250 grams (“g”).
- a plurality of weight members having a mass of less than 85 g are disposed within a hollow interior of the body.
- the golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm 2 to 5000 g-cm 2 .
- the golf club head has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm 2 to 2050 g-cm 2 .
- Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm 2 .
- Another aspect of the present invention is a golf club head having a crown, a sole, a striking plate and an external hosel extending outward from the crown.
- the golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm 2 to 5000 g-cm 2 .
- the golf club head has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm 2 to 2050 g-cm 2 .
- Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm 2 .
- Yet another aspect of the present invention is a golf club head having a crown, a sole and a striking plate.
- the golf club head has a hollow interior and is composed of a titanium alloy material.
- the golf club head has a mass less than 250 g, and the striking plate has concentric regions of varying thickness.
- Weight members are disposed within the hollow interior of the body.
- the golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm 2 to 5000 g-cm 2 .
- the golf club head has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm 2 to 2050 g-cm 2 .
- Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm 2 .
- FIG. 1 is a top plan view of a golf club head of the present invention.
- FIG. 2 is a rear view of the golf club head of FIG. 1.
- FIG. 3 is a toe end view of the golf club head of FIG. 1.
- FIG. 4 is a heel end view of the golf club head of FIG. 1.
- FIG. 5 is a cross-sectional view of the golf club head of FIG. 1 along line 5 - 5 .
- FIG. 6 is a cross-sectional view of the golf club head of FIG. 1 along line 6 - 6 .
- FIG. 7 is a cross-sectional view of the golf club head of FIG. 1 along line 7 - 7 .
- FIG. 8 is a cross-sectional view of the golf club head of FIG. 1 along line 8 - 8 .
- FIG. 8A is a cross-sectional view of the golf club head of an alternative embodiment with a sole plate having a an attached hosel.
- FIG. 9 is an exploded view of the golf club head of the present invention.
- FIG. 9A is an exploded view of another alternative embodiment of the golf club head of the present invention.
- FIG. 9B is an exploded view of yet another alternative embodiment of the golf club head of the present invention.
- FIG. 9C is an exploded view of an alternative embodiment of the golf club head of the present invention.
- FIG. 10 is a top plan view of a golf club of the present invention illustrating the Y axis and X axis.
- FIG. 10A is a heel side plan view of a golf club of the present invention illustrating the Z axis and X axis.
- FIG. 10B is a front plan view of a golf club of the present invention illustrating the Z axis and Y axis.
- FIG. 11 is a front plan view of a golf club of the present invention illustrating the test frame coordinates X T and Y T and transformed head frame coordinates Y H and Z H .
- FIG. 11A is a toe end view of the golf club of the present invention illustrating the test frame coordinate Z T and transformed head frame coordinates X H and Z H .
- FIG. 12 is an illustration of a center of gravity table for a golf club head of the present invention used to measure the center of gravity along the X axis.
- FIG. 12A is an illustration of a center of gravity table for a golf club head of the present invention used to measure the center of gravity along the Y axis.
- FIG. 12B is an illustration of a center of gravity table for a golf club head of the present invention used to measure the center of gravity along the Z axis.
- FIG. 12C is an Inertia Dynamic Moment of Inertia Machine for a golf club head of the present invention and illustrates distance from the head to spin axis in the X T direction.
- FIG. 12D is an Inertia Dynamic Moment of Inertia Machine for a golf club head of the present invention and illustrates distance from the head to the spin axis in the Y T direction.
- FIG. 12E is an Inertia Dynamic Moment of Inertia Machine for a golf club head of the present invention and illustrates distance from the head to the spin axis in the Z T direction.
- FIG. 13 is an illustration of the effect of the product of inertia Iyz on a lofting force from a high-center strike of a golf ball against the striking plate a golf club.
- FIG. 14 is an illustration of the effect of the product of inertia Iyz on a de-lofting force from a low-center strike of a golf ball against the striking plate a golf club.
- FIG. 15 is an illustration of the effect of the product of inertia Izy on a closing force from a off-center heel strike of a golf ball against the striking plate a golf club.
- FIG. 16 is an illustration of the effect of the product of inertia Izy on an opening force from a off-center toe strike of a golf ball against the striking plate a golf club.
- FIG. 18 is a schematic drawing of a face of a golf club head with the change in dispersion at three different hit locations per 100 g-cm 2 increase in the product of inertia Iyz.
- FIG. 19 is a graph of dispersion (y-axis) vs. the product of inertia Iyz (x-axis) for a pattern dispersion scatter.
- FIG. 20 is a schematic drawing of a face of a golf club head with the change in dispersion at nine different hit locations per 100 g-cm 2 increase in the product of inertia Iyz.
- FIG. 21 is a graph of distance (y-axis) vs. the product of inertia Iyz (x-axis).
- FIG. 22 is a schematic drawing of a face of a golf club head with the change in distance at nine different hit locations per 100 g-cm 2 increase in the product of inertia Iyz.
- FIG. 23 is an illustration of the effect of the product of inertia Ixy on a vertical force from a off-center heel strike of a golf ball against the striking plate a golf club.
- FIG. 24 is an illustration of the effect of the product of inertia Ixy on a vertical force from a off-center toe strike of a golf ball against the striking plate a golf club.
- FIG. 25 is an illustration of the effect of the product of inertia Ixy on a lofting force from a high-center strike of a golf ball against the striking plate a golf club.
- FIG. 26 is an illustration of the effect of the product of inertia Ixy on a de-lofting force from a low-center strike of a golf ball against the striking plate a golf club.
- FIG. 27 is a graph of distance (y-axis) vs. the product of inertia Ixy (x-axis).
- FIG. 28 is a schematic drawing of a face of a golf club head with the change in distance at nine different hit locations per 100 g-cm 2 increase in the product of inertia Ixy.
- FIG. 29 is a graph of dispersion (y-axis) vs. the product of inertia Ixy (x-axis) for a pattern dispersion scatter.
- FIG. 30 is a schematic drawing of a face of a golf club head with the change in dispersion at nine different hit locations per 100 g-cm 2 increase in the product of inertia Ixy.
- FIG. 31 is an illustration of the effect of the product of inertia Ixz on a vertical force from a off-center heel strike of a golf ball against the striking plate a golf club.
- FIG. 32 is an illustration of the effect of the product of inertia Ixz on a vertical force from a off-center toe strike of a golf ball against the striking plate a golf club.
- FIG. 33 is an illustration of the effect of the product of inertia Ixz on a closing force from a off-center heel strike of a golf ball against the striking plate a golf club.
- FIG. 34 is an illustration of the effect of the product of inertia Ixz on an opening force from a off-center toe strike of a golf ball against the striking plate a golf club.
- FIG. 35 is a graph of distance (y-axis) vs. the product of inertia Ixz (x-axis).
- FIG. 36 is a schematic drawing of a face of a golf club head with the change in distance at nine different hit locations per 100 g-cm 2 increase in the product of inertia Ixz.
- FIG. 37 is a graph of dispersion (y-axis) vs. the product of inertia Ixz (x-axis) for a pattern dispersion scatter.
- FIG. 38 is a schematic drawing of a face of a golf club head with the change in dispersion at nine different hit locations per 100 g-cm 2 increase in the product of inertia Ixz.
- FIG. 39 is a top view of the golf club of the present invention partitioned into four quadrants by the X axis and the Y axis through the center of gravity.
- FIG. 40 is a toe-side view of the golf club of the present invention partitioned into four quadrants by the X axis and the Z axis through the center of gravity.
- FIG. 41 is a front view of the golf club of the present invention partitioned into four quadrants by the Y axis and the Z axis through the center of gravity.
- FIG. 42 is a front view of the golf club of the present invention partitioned into four quadrants by the Y axis and the Z axis through the center of gravity, with a weight member positioned in quadrant I.
- FIG. 43 is a front view of the golf club of the present invention partitioned into four quadrants by the Y axis and the Z axis through the center of gravity, with a weight member positioned in quadrant II.
- a golf club head of the present invention is generally designated 20 .
- All of the products of inertia (Ixy, Ixz and Iyz) of the golf club head have an absolute value below 100 g-cm 2 .
- the products of inertia Ixy, Ixz and Iyz are less than 50 g-cm 2 , and most preferably the products of inertia Ixy, Ixz and Iyz approach zero.
- the moment of inertia, Izz, about the Z axis for the golf club head 20 of the present invention will range from 2800 g-cm 2 to 5000 g-cm 2 , preferably from 3000 g-cm 2 to 4500 g-cm 2 , and most preferably from 3500 g-cm 2 to 4000 g-cm 2 .
- the moment of inertia, Iyy, about the Y axis for the golf club head 20 of the present invention will range from 1500 g-cm 2 to 2500 g-cm 2 , preferably from 1800 g-cm 2 to 2100 g-cm 2 , and most preferably from 1900 g-cm 2 to 2050 g-cm 2 .
- the golf club head 20 will preferably have a volume ranging from 300 cubic centimeters (“cc”) to 600 cc, and more preferably from 325 cc to 525 cc.
- the club head 20 is preferably a driver or fairway wood.
- the body 22 has a crown 24 , a face 26 , a sole 28 and a ribbon 30 juxtaposed by the sole 28 and the crown 24 .
- the ribbon 30 generally extends from a toe end 32 to a heel end 34 .
- the ribbon 30 generally begins at one end of the face 26 and ends at an opposite end of the face 26 .
- a rear 36 of the body 22 is opposite the face 26 and is defined by portions of the ribbon 30 , the crown 24 and the sole 28 .
- the ribbon 30 increases the volume of the club head 20 and also assists in creating a club head 20 with a higher moment of inertia as described in greater detail below.
- an internal hosel 38 with a shaft opening 39 for insertion of a shaft therein.
- the body 22 is composed of metals, composite materials, plastic materials and the like.
- the body 22 is composed of a plies of carbon pre-preg (pre-impregnated) sheets, or a similar non-metallic material.
- the body 22 is composed of a forged titanium alloy material.
- the body is composed of a forged steel material.
- the body 22 is composed of a cast titanium alloy material. Those skilled in the art will recognize that the body 22 may be composed of other materials without departing from the scope and spirit of the present invention.
- the body 22 preferably has a hollow interior 44 defined by the walls of the crown 24 , face 26 , sole 28 and ribbon 30 .
- the walls of the crown 24 , sole 28 and ribbon 30 are relatively thin in order to minimize mass.
- the thickness of the wall of the face 26 is thicker than the other walls due to the necessity to sustain impact with a golf ball. If the face 26 is composed of a metal material, it preferably has variable thickness such as disclosed in U.S. Pat. No. 5,830,084 which is hereby incorporated by reference in its entirety.
- the club head 20 has a plurality of weight members 40 disposed in the hollow interior 44 of the club head 20 .
- the weight members 40 are positioned for location of the center of gravity, to increase the moments of inertia and to minimize the products of inertia.
- the weight members 40 are preferably embedded within layers of the plies of pre-preg as described in greater detail below.
- each of the weight members 40 is a weight compartment composed of the same material as the sole 29 for welding thereto.
- the weight compartment defines a chamber of a predetermined volume with a material disposed therein having a density of seven to twenty grams/cubic centimeters and weighing between three to seventy grams (bismuth is one such material).
- a weighting member 40 is disclosed in co-pending U.S. patent application Ser. No. 09/633,010, filed on Aug. 4, 2000, entitled Weighting System For Golf Club Head, which is hereby incorporated by reference in its entirety.
- the weight member is a tungsten screw that is threadingly engaged into the body 22 at the proper position, or a weight chip welded to the body 22 .
- the sole plate 42 is attached to the exterior surface of the sole 28 and a hosel 38 is positioned within the hollow interior 44 of the club head 20 .
- the sole plate 42 is preferably composed of a metal such as aluminum, titanium or stainless steel.
- the sole plate 42 weighs approximately 5 grams to 15 grams.
- the hosel 38 is preferably composed of a metal such as stainless steel, or a polycarbonate material.
- the hosel 38 preferably weighs 12 to 16 grams.
- FIG. 8A has an integral sole plate and hosel such as described in U.S. Pat. No. 6,244,976, filed on Dec. 29, 1999, and entitled Integral Sole Plate And Hosel For A Golf Club Head, which is hereby incorporated by reference in its entirety.
- the hosel may be an external hosel that extends upward from the heel end of a golf club head, and that such an external hosel would have an affect on the products of inertia.
- the weight members 40 are preferably composed of a film loaded with a high density metal (like tungsten), or a metal material such as copper, tungsten, steel, aluminum, tin, silver, gold, platinum, or the like.
- a preferred weight member 40 is a thermoplastic material filled with a metal to an appropriate density, and the metal filler may be tungsten, brass, copper, steel, tin, or the like.
- Each weight member 40 has a density greater than the material of the body 22 .
- Each weight strip 40 individually weighs approximately 3 grams to 35 grams, and more preferably from 10 grams to 30 grams. In a preferred embodiment, the total combined weight of all of the weight members 40 is approximately 30 grams to 80 grams, and most preferably 60 grams.
- one weight member 40 is positioned in the upper ribbon 30 a in a U-like arrangement to increase the moment of inertia of the golf club head 20 .
- a second balancing weight member 40 ′ is positioned in the lower ribbon 30 b at the toe end 32 of the golf club head 20 to balance the internal hosel 38 in order to reduce the products of inertia of the golf club head 20 below 100 g-cm 2 .
- the weight member 40 in the upper ribbon 30 a extends from approximately the heel end 34 of the face 26 through the rear 36 to the toe end 32 of the face 26 .
- this weight member 40 may only extend along the rear 36 of the upper ribbon 30 a, the heel end 34 of the upper ribbon 30 a, the toe end 32 of the upper ribbon 30 a, or any combination thereof.
- the balancing weight member 40 ′ in the lower ribbon section 30 b preferably matches the moment of inertia effect of the internal hosel 38 .
- the weight member 40 is a single piece co-cured to the upper ribbon 30 a.
- two, three, four, or more weight members 40 maybe co-cured and extend along a portion of the upper ribbon 30 a.
- the multiple weight members 40 may be partitioned horizontally or vertically.
- three separate weight members 40 a - c are parallel to each other and extend along substantially the entire length of the upper ribbon 30 a.
- multiple weight members 40 a - j are evenly distributed along the entire length of the upper ribbon 30 a.
- FIG. 9A three separate weight members 40 a - c are parallel to each other and extend along substantially the entire length of the upper ribbon 30 a.
- multiple weight members 40 a - j are evenly distributed along the entire length of the upper ribbon 30 a.
- FIG. 9A three separate weight members 40 a - c are parallel to each other and extend along substantially the entire length of the upper ribbon 30 a.
- multiple weight members 40 a - j are evenly distributed along the entire length of the upper ribbon 30
- weight members 40 a - c are positioned in the toe end 32 of the ribbon 30 , the rear 36 of the ribbon 30 , and the heel end 32 of the ribbon 30 .
- This embodiment does not have a balancing weight member 40 ′, however, the weight members 40 a - c vary in weight in order to have a golf club head 20 with all products of inertia (Ixy, Ixz and Iyz) below 100 g-cm 2 .
- Ixy, Ixz and Iyz inertia
- the preferred composite material is plies of carbon pre-preg sheets.
- Plies of pre-preg composite sheets are manufactured by pulling strands of fiber in a parallel motion, preferably carbon or glass fiber, through a resin film and allowing the resin to partially cure or “stage”. When the resin is partially staged, the resin holds the fibers together such that the fibers form a malleable sheet with all of the fibers in a specific orientation relative to an edge of the sheet.
- Exemplary carbon pre-preg fiber sheets may be obtained from Newport Composites of Santa Ana, Calif., Cytec Inc. of Anaheim, Calif., or Hexcel Inc. of Pleasonton, Calif.
- the layers 41 a - c of the composite body 22 may comprise a plurality of plies of composite fiber without any resin, each typically comprising a continuous fiber braid or mat, that are used to make a dry reinforcement preform, as described in U.S. Pat. No. 6,010,411 filed on Oct. 23, 1997, which is hereby incorporated by reference in its entirety.
- the composite body 22 may include one or more plies of pre-preg that define structurally the various walls of the golf club head 20 . Numerous other configurations may, of course, be utilized depending upon the desired structural characteristics of the golf club head 20 . One such configuration is set forth in co-pending U.S. patent application Ser. No. 09/474,670, filed on Dec. 29, 1999, entitled Composite Golf Club Head And Manufacturing Method, which is hereby incorporated by reference in its entirety.
- FIGS. 10, 10A and 10 B illustrate the axes of inertia through the center of gravity of the golf club head.
- the axes of inertia are designated X, Y and Z.
- the X axis extends from the striking plate 26 through the center of gravity, CG, and to the rear of the golf club head 20 .
- the Y axis extends from the toe end 32 of the golf club head 20 through the center of gravity, CG, and to the heel end 34 of the golf club head 20 .
- the Z axis extends from the crown 24 through the center of gravity, CG, and to the sole 28 .
- the center of gravity, or center of mass, of the golf club head is a point inside of the club head determined by the vertical intersection of two or more points where the club head balances when suspended. A more thorough explanation of this definition of the center of gravity is provided in Golf Club Design, Fitting, Alteration & Repair.
- the center of gravity and the moment of inertia of a golf club head 20 are preferably measured using a test frame (X T , Y T , Z T ), and then transformed to a head frame (X H , Y H , Z H ), as shown in FIGS. 11 and 11A.
- the center of gravity of a golf club head may be obtained using a center of gravity table 55 having two weight scales thereon, as shown in FIGS. 12, 12A and 12 B. If a shaft is present, it is removed and replaced with a hosel cube 57 that has a multitude of faces normal to the axes of the golf club head 20 .
- the scales allow one to determine the weight distribution of the golf club head when the golf club head is placed on both scales simultaneously and weighed along a particular direction, the X, Y or Z direction.
- the weight scales are parallel to the earth's gravity allowing the weight distribution along each direction to be calculated to determine the location of the center of gravity where:
- test frame coordinates are determined, they are transformed to head frame coordinates using the following equations:
- ⁇ X cg H Y cg H Z cg H ⁇ ( 0 0 1 cos ⁇ ( ⁇ lie ) sin ⁇ ( ⁇ lie ) 0 sin ⁇ ( ⁇ lie ) cos ⁇ ( ⁇ lie ) 0 ) ⁇ ⁇ ⁇ X cg T Y cg T Z cg T ⁇ + z ⁇ ⁇ 0 1 / tan ⁇ ( ⁇ lie ) 1 ⁇
- the moment of inertia is measured using an Inertia Dynamic Moment of Inertia machine 59 as shown in FIGS. 12C, 12D and 12 E.
- the machine 59 has a rectangular plate with adapter holes spaced 0.5 inch apart from each other.
- the rectangular plate is mounted on the machine 59 to allow oscillation thereof.
- a golf club head 20 is placed on the rectangular plate and the time for one oscillation period is measured by the machine.
- the oscillation time is directly related to the moment of inertia of the golf club head about the axis of rotation of the machine, which in effect is a single degree of freedom with the restoring force generated by a torsional spring.
- the desired moment of inertia may be measured for an axis.
- Nine different orientations are required to generate an inertia tensor, and since the moment of inertia measured includes the plate and the adapter, nine additional measurements are required to measure the baseline moment of inertia of the initial setup.
- the moment of inertia of the golf club head is the difference between the measurement taken with the golf club head, adapter and plate and the internal rotating mass of the machine, and that of the just the adapter and plate and the internal rotating mass of the machine.
- the orientations are the same from head to head, the position on the rectangular plate depends on the center of gravity of the particular golf club head.
- the nine measurements without the golf club head are the same for orientation and the location of the adapter.
- the machine has a center of gravity and moment of inertia program to calculate the adapter holes on the rectangular plate that place the center of gravity closest to the axis of rotation, thereby minimizing error.
- the program uses the parallel axis theorem to account for the axis of rotation not containing the center of gravity of the golf club head. This will yield an inertia tensor about the center of gravity, which in turn allows the moment of inertia about any axis to be calculated for the golf club head. TABLE ONE
- Table One lists the location of the center of gravity, the moments of inertia about the center of gravity, and the products of inertia for prior art composite golf club heads.
- the moment of inertia Izz about the Z axis is less than 2436.00 g-cm 2 for any of the prior art composite heads.
- the highest moment of inertia, Izz, about the Z axis is 2435.72 g-cm 2 for the Yonex 1 AERONA 300 composite driver.
- the moment of inertia, Iyy, about the Y axis is less than 1300.00 g-cm 2 for any of the prior art composite heads.
- the highest moment of inertia, Iyy, about the Y axis is 1298.21 g-cm 2 for the Daiwa 1, G 3 composite driver.
- the mass for all of the composite heads of Table One ranges from 186 grams to 208.5 grams.
- Each of the composite golf clubs of Table One that have a high moment of inertia or a volume greater than 300 cc, have at least one absolute value for the products of inertia that is over 100 g-cm 2 .
- the Yonex 1 AERONA 300 has the highest moment of inertia of Table One, but its product of inertia Ixy is 205.06 g-cm 2 .
- Table Two lists the moments of inertia about the center of gravity, and the products of inertia for prior art metal golf club heads from Callaway Golf Company of Carlsbad, California, beginning with the GREAT BIG BERTHA® cast titanium driver in row 1, the BIGGEST BIG BERTHA® cast titanium driver in row 2, the GREAT BIG BERTHA® HAWK EYE® cast titanium driver in row 3, the BIG BERTHA® STEELHEAD PLUSTM cast stainless steel driver in row 4, and the ERC® forged titanium driver in row 5.
- the moment of inertia Izz about the Z axis is less than 2900.00 g-cm 2 for any of the golf club heads of Table Two.
- the highest moment of inertia, Izz, about the Z axis, is 2900 g-cm 2 for the CALLAWAY GOLF® BIGGEST BIG BERTHA® driver.
- the moment of inertia, Iyy, about the Y axis is less than 1800.00 g-cm 2 for any of the club heads of Table Two.
- the mass for all of the club heads of Table Two ranges from 186 grams to 208.5 grams. All of the club heads of Table Two have at least one absolute value for the products of inertia that is over 100 g-cm 2 .
- Table Three lists the moment of inertia and products of inertia for a golf club head 20 of the present invention.
- An “unweighted” club head 20 (without the weight members 40 ) weighs from 90 grams to 120 grams thereby allowing for 60 grams to 105 grams of weight to be placed accordingly to achieve the reduced products of inertia for the golf club head 20 of the present invention.
- the moment of inertia, Izz, about the Z axis for the golf club head 20 of the present invention will range from 2800 g-cm 2 to 5000 g-cm 2 , preferably from 3000 g-cm 2 to 4500 g-cm 2 , and most preferably from 3500 g-cm 2 to 4000 g-cm 2 .
- the moment of inertia, Iyy, about the Y axis for the golf club head 20 of the present invention will range from 1500 g-cm 2 to 2500 g-cm 2 , preferably from 1800 g-cm 2 to 2100 g-cm 2 , and most preferably from 1900 g-cm 2 to 2050 g-cm 2 .
- the product of inertia Ixy of the golf club head 20 of the present invention 20 has an absolute value less than 100 g-cm 2 .
- the product of inertia Ixy is less than 50 g-cm 2 , and most preferably the product of inertia Ixy approaches zero.
- the product of inertia Ixz of the golf club head 20 of the present invention 20 has an absolute value less than 100 g-cm 2 .
- the product of inertia Ixz is less than 50 g-cm 2 , and most preferably the product of inertia Ixz approaches zero.
- the product of inertia Iyz of the golf club head 20 of the present invention 20 has an absolute value less than 100 g-cm 2 .
- the product of inertia Iyz is less than 50 g-cm 2 , and most preferably the product of inertia Iyz approaches zero.
- FIGS. 13 - 38 illustrate how the products of inertia effect the distance and dispersion of a golf ball struck with a golf club.
- FIG. 13 illustrates the effects of the product of inertia, Iyz, for a lofting force from a high center hit.
- High center hits are defined as hits that have their impulse vector above the center of gravity of the golf club head 20
- low center hits are defined as hits that have their impulse vector below the center of gravity of the golf club head 20 .
- the product of inertia Iyz causes a lofting moment in the golf club head 20 which creates a closing rotation thereby leading to a slice spin in the golf ball 63 .
- FIG. 14 illustrates the effects of the product of inertia, Iyz, for a de-lofting force from a low center hit.
- the product of inertia Iyz causes a de-lofting moment in the golf club head 20 which creates an opening rotation thereby leading to a draw spin in the golf ball 63 .
- FIG. 15 illustrates the effects of the product of inertia, Iyz, for a closing force from an off center heel hit.
- the product of inertia Iyz causes a closing moment in the golf club head 20 which creates a lofting rotation thereby leading to a top spin in the golf ball 63 .
- FIG. 16 illustrates the effects of the product of inertia, Iyz, for a opening force from an off center toe hit.
- the product of inertia Iyz causes an opening moment in the golf club head 20 which creates a de-lofting rotation thereby leading to a back spin in the golf ball 63 .
- FIG. 17 illustrates the effects of the product of inertia Iyz on the dispersion of a golf ball.
- a golf club having a product of inertia Iyz of zero has a relatively small dispersion for any hit location whereas golf club having a product of inertia Iyz of 300 (absolute value) has a dispersion that varies 35 feet depending on the hit location.
- FIG. 18 illustrates the effect on dispersion from increasing the product of inertia Iyz.
- a high center hit will have a 6.9 feet dispersion to the right (R) per 100 g-cm 2 increase in Iyz, and a low center hit will have a 4.2 feet dispersion to the left (L) per 100 g-cm 2 increase in Iyz.
- FIG. 19 illustrates the effect on dispersion from increasing the product of inertia Iyz for the average of a nine hit pattern.
- FIG. 20 illustrates the nine-hit location effect on dispersion from increasing the product of inertia Iyz.
- FIGS. 21 and 22 illustrate the effect on distance from increasing the product of inertia Iyz for the average of a nine hit pattern. For example, a high center hit will have a ⁇ 0.3 yard effect on distance per 100 g-cm 2 increase in Iyz, and a high toe hit will have a 1.5 yard effect on distance per 100 g-cm 2 increase in Iyz.
- FIG. 23 illustrates the effects of the product of inertia Ixy for a vertical force from an off-center heel hit.
- the product of inertia Ixy causes a toe-up moment in the golf club head 20 which creates a lofting rotation thereby leading to a top spin in the golf ball 63 .
- FIG. 24 illustrates the effects of the product of inertia Ixy for a vertical force from an off-center toe hit.
- the product of inertia Ixy causes a toe-down moment in the golf club head 20 which creates a de-lofting rotation thereby leading to a back spin in the golf ball 63 .
- FIG. 25 illustrates the effects of the product of inertia Ixy for a lofting force from a high center hit.
- the product of inertia Ixy causes a lofting moment in the golf club head 20 which creates a toe-up rotation thereby leading to the golf ball 63 having a back spin for a heel hit, a top spin for a toe hit and a fade spin for a center hit.
- FIG. 26 illustrates the effects of the product of inertia Ixy for a de-lofting force from a low center hit.
- the product of inertia Ixy causes a de-lofting moment in the golf club head 20 which creates a toe-down rotation thereby leading to the golf ball 63 having a back spin for a toe hit, a top spin for a heel hit and a fade spin for a center hit.
- FIGS. 27 and 28 illustrate the effect on distance from increasing the product of inertia Ixy for the average of a nine hit pattern. For example, a high center hit will have a ⁇ 0.3 yard effect on distance per 100 g-cm 2 increase in Ixy, and a low toe hit will have a ⁇ 0.9 yard effect on distance per 100 g-cm 2 increase in Ixy.
- FIGS. 29 and 30 illustrate the effect on dispersion from increasing the product of inertia Ixy for the average of a nine hit pattern. For example, a high center hit will have a 3.9 feet effect to the right per 100 g-cm 2 increase in Ixy, and a high toe hit will have a 2.1 feet effect to the right per 100 g-cm 2 increase in Ixy.
- FIG. 31 illustrates the effects of the product of inertia Izx for a vertical force from an off-center heel hit.
- the product of inertia Izx causes a toe-up moment in the golf club head 20 which creates a closing rotation thereby leading to a slice spin in the golf ball 63 .
- FIG. 32 illustrates the effects of the product of inertia Izx for a vertical force from an off-center toe hit.
- the product of inertia Izx causes a toe-down moment in the golf club head 20 which creates an opening rotation thereby leading to a draw spin in the golf ball 63 .
- FIG. 33 illustrates the effects of the product of inertia, Izx, for a closing force from an off center heel hit.
- the product of inertia Izx causes a closing moment in the golf club head 20 which creates a toe-up rotation thereby leading to a back spin in the golf ball 63 .
- FIG. 34 illustrates the effects of the product of inertia, Izx, for a opening force from an off center toe hit.
- the product of inertia Izx causes an opening moment in the golf club head 20 which creates a toe-down rotation thereby leading to a back spin in the golf ball 63 .
- FIGS. 35 and 36 illustrate the effect on distance from increasing the product of inertia Ixz for the average of a nine hit pattern. For example, a high heel hit will have a ⁇ 0.9 yard effect on distance per 100 g-cm 2 increase in Ixz, and a low toe hit will have a ⁇ 0.9 yard effect on distance per 100 g-cm 2 increase in Ixz.
- FIGS. 37 and 38 illustrate the effect on dispersion from increasing the product of inertia Ixz for the average of a nine hit pattern. For example, a high heel hit will have a 4.5 feet effect to the right per 100 g-cm 2 increase in Ixz, and a high toe hit will have a 3.9 feet effect to the left per 100 g-cm 2 increase in Ixz.
- the club head 20 of the present invention is partitioned into four regions, I, II, III and IV. Mass added in either regions I or III increases the product of inertia Ixy whereas mass add in either regions II or IV decreases the product of inertia Ixy. The location at which mass is added within any given region determines the magnitude of change to Ixy. An incremental change in Ixy is determined by the amount of mass “m” added and the X and Y coordinate location of the mass (wherein X and Y are measured from the center of gravity, CG, of the golf club head 20 ) using the following formula:
- the club head 20 of the present invention is partitioned into four regions, I, II, III and IV. Mass added in either regions I or III increases the product of inertia Ixz whereas mass add in either regions II or IV decreases the product of inertia Ixz. The location at which mass is added within any given region determines the magnitude of change to Ixz. An incremental change in Ixz is determined by the amount of mass “m” added and the X and Z coordinate location of the mass (wherein X and Z are measured from the center of gravity, CG, of the golf club head 20 ) using the following formula:
- the club head 20 of the present invention is partitioned into four regions, I, II, III and IV. Mass added in either regions I or III increase the product of inertia Iyz whereas mass add in either regions II or IV decreases the product of inertia Iyz. The location at which mass is added within any given region determines the magnitude of change to Iyz. An incremental change in Iyz is determined by the amount of mass “m” added and the Y and Z coordinate location of the mass (wherein Y and Z are measured from the center of gravity, CG, of the golf club head 20 ) using the following formula:
- a five gram weight member 40 ′ is added to the club head 20 as shown in FIG. 42.
- the weight is added at a location in quadrant I at four centimeters along the Y axis from the center of gravity and one centimeter along Z axis from the center of gravity.
- Iyz ⁇ mdydz
- the precise affect of the weight member 40 ′ on Iyz is determined by accounting for the finite size of the mass by integrating over the area of the weight member 40 ′.
- FIG. 43 A second example is shown in FIG. 43 wherein the five gram weight member 40 ′ is positioned at a location in quadrant II at three centimeters along the Y axis from the center of gravity and one centimeter along the Z axis below the center of gravity.
- Iyz ⁇ mdydz
- the precise affect of the weight member 40 ′ on Iyz is determined by accounting for the finite size of the mass by integrating over the area of the weight member 40 ′.
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Abstract
Description
- This application is a continuation-in-part application of co-pending U.S. patent application Ser. No. 09/796,951, filed on Feb. 27, 2001, which is a continuation-in-part application of co-pending U.S. patent application Ser. No. 09/474,688, filed on Dec. 29, 1999, which is a continuation-in-part application of U.S. patent application Ser. No. 08/958,723, filed on Oct. 23, 1997, and now U.S. Pat. No. 6,010,411, all of which are hereby incorporated by reference in their entirety.
- Not Applicable
- 1. Field of the Invention
- The present invention relates to a large volume golf club head that optimizes the products of moments of inertia. More specifically, the present invention relates to a large volume golf club head that has large moments of inertia with small absolute values for the products of inertia.
- 2. Description of the Related Art
- In recent years, substantial attention has been directed toward the development of golf club heads having desired weight characteristics and, in particular, toward the development of golf club heads having a desired center of gravity location. For example, a designer may want to locate the center of gravity of a golf club head in a predetermined or preferred position relative to the face or “sweet spot” of the golf club head to provide greater distance.
- Because conventional golf club heads are typically made from metal alloys or other materials having a substantially homogeneous density, the weight characteristics of such golf club heads are typically defined by their overall shape. Thus, to alter the location of the center of gravity of a golf club head, it is often necessary to redesign the shape or configuration of the golf club head. However, this may adversely impact other desired characteristics of the golf club head.
- The design process may be further complicated where golf club heads are manufactured using composite materials (typically carbon reinforced plastic). Because composite materials are typically less dense than metal and other conventional materials, composite golf club heads generally require additional weighting to achieve desired swing weights for finished golf clubs.
- The Rules of Golf, established and interpreted by the United States Golf Association (“USGA”) and The Royal and Ancient Golf Club of Saint Andrews, set forth certain requirements for a golf club head. The requirements for a golf club head are found in
Rule 4 and Appendix II. A complete description of the Rules of Golf are available on the USGA web page at www.usga.org. Although the Rules of Golf do not expressly state specific parameters for a golf club, Rule 4-1d states that the club head shall be generally plain in shape, and all parts shall be rigid, structural in nature and functional. - In the past few years, the volume of drivers and fairway woods have increased to provide greater forgiveness for golfers. The BIG BERTHA® driver from Callaway Golf Company of Carlsbad, Calif., at 195 cubic centimeters (cc) was the beginning of the large volume drivers. The BIG BERTHA® stainless steel driver was followed by the GREAT BIG BERTHA® titanium driver, also from the Callaway Golf Company, which had a volume of 250 cc. Then, the BIGGEST BIG BERTHA® titanium driver was introduced by the Callaway Golf Company, which had a volume of 295 cc. Recently, the forged titanium ERC® driver was introduced by the Callaway Golf Company, which had a volume of 300 cc. These large volume drivers have greater moments of inertia than previous golf clubs partly due to their size, and the desire to locate the center of gravity in a favorable position. It was believed that increasing the moments of inertia, Ixx, Izz and Iyy, of a driver would make the driver more forgiving. However, forgiveness, in the form of reduced dispersion is not a function of the moments of inertia, but rather a result of the products of inertia, Ixy, Ixz and Iyz.
- The products of inertia relate moments about one axis with head rotations about another axis. These head rotations in turn cause vertical or horizontal gear effect that impart increased or reduced backspin and draw or fade spin to a golf ball. Unlike the spins generated by conventional gear effect associated with Iyy and Izz, these spins cannot be compensated for by adjusting the face bulge radius and the face roll radius. As club heads become larger than 300 cc, and moments of inertia become larger, Izz greater than 3000 grams centimeter squared and Iyy greater than 1800 grams, there is a propensity for the products of inertia to also become larger. As the products of inertia become larger, there is a deleterious effect on dispersion.
- Thus, there is a need for a large volume golf club head with large moments of inertia, that have smaller products of inertia. This need is difficult to meet since large products of inertia are by-products of large moments of inertia.
- The present invention provides a large volume golf club head with high moments of inertia that has smaller products of inertia. The golf club head of the present invention provides all of the advantages of large volume golf club heads with large moments of inertia, such as greater confidence and greater distance, without the attendant increase in dispersion. Thus, off-center hits have greater distance and increased straightness with the golf club head of the present invention, which results in more consistent golf ball flight and improved accuracy for the golfer.
- One aspect of the present invention is a golf club head including a body having a crown, a sole and a striking plate. The body has a hollow interior. The golf club head has a volume ranging from 300 cubic centimeters (“cm3”) to 600 cm3. Each of the products of inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 grams-centimeter squared (“g-cm2”).
- Another aspect of the present invention is a high moment of inertia golf club head having a body composed of a crown, a sole and a striking plate. The body has a hollow interior. The golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm2 to 5000 g-cm2 . The golf club head also has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm2 to 2050 g-cm2. Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm2.
- Another aspect of the present invention is a golf club head having a body composed of a titanium alloy material and having a mass less than 250 grams (“g”). A plurality of weight members having a mass of less than 85 g are disposed within a hollow interior of the body. The golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm2 to 5000 g-cm2. The golf club head has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm2 to 2050 g-cm2. Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm2.
- Another aspect of the present invention is a golf club head having a body composed of a steel alloy material and having a mass less than 250 grams (“g”). A plurality of weight members having a mass of less than 85 g are disposed within a hollow interior of the body. The golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm2 to 5000 g-cm2. The golf club head has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm2 to 2050 g-cm2. Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm2.
- Another aspect of the present invention is a golf club head having a crown, a sole, a striking plate and an external hosel extending outward from the crown. The golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm2 to 5000 g-cm2. The golf club head has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm2 to 2050 g-cm2. Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm2.
- Yet another aspect of the present invention is a golf club head having a crown, a sole and a striking plate. The golf club head has a hollow interior and is composed of a titanium alloy material. The golf club head has a mass less than 250 g, and the striking plate has concentric regions of varying thickness. Weight members are disposed within the hollow interior of the body. The golf club head has a moment of inertia, Izz, about a vertical axis Z through the center of gravity of the golf club head that ranges from 3000 g-cm2 to 5000 g-cm2 . The golf club head has a moment of inertia, Iyy, about the horizontal axis Y through the center of gravity of the golf club head that ranges from 1900 g-cm2 to 2050 g-cm2. Each of the products inertia, Ixy, Ixz and Iyz, of the golf club head have an absolute value less than 100 g-cm2.
- Having briefly described the present invention, the above and further objects, features and advantages thereof will be recognized by those skilled in the pertinent art from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
- FIG. 1 is a top plan view of a golf club head of the present invention.
- FIG. 2 is a rear view of the golf club head of FIG. 1.
- FIG. 3 is a toe end view of the golf club head of FIG. 1.
- FIG. 4 is a heel end view of the golf club head of FIG. 1.
- FIG. 5 is a cross-sectional view of the golf club head of FIG. 1 along line5-5.
- FIG. 6 is a cross-sectional view of the golf club head of FIG. 1 along line6-6.
- FIG. 7 is a cross-sectional view of the golf club head of FIG. 1 along line7-7.
- FIG. 8 is a cross-sectional view of the golf club head of FIG. 1 along line8-8.
- FIG. 8A is a cross-sectional view of the golf club head of an alternative embodiment with a sole plate having a an attached hosel.
- FIG. 9 is an exploded view of the golf club head of the present invention.
- FIG. 9A is an exploded view of another alternative embodiment of the golf club head of the present invention.
- FIG. 9B is an exploded view of yet another alternative embodiment of the golf club head of the present invention.
- FIG. 9C is an exploded view of an alternative embodiment of the golf club head of the present invention.
- FIG. 10 is a top plan view of a golf club of the present invention illustrating the Y axis and X axis.
- FIG. 10A is a heel side plan view of a golf club of the present invention illustrating the Z axis and X axis.
- FIG. 10B is a front plan view of a golf club of the present invention illustrating the Z axis and Y axis.
- FIG. 11 is a front plan view of a golf club of the present invention illustrating the test frame coordinates XT and YT and transformed head frame coordinates YH and ZH.
- FIG. 11A is a toe end view of the golf club of the present invention illustrating the test frame coordinate ZT and transformed head frame coordinates XH and ZH.
- FIG. 12 is an illustration of a center of gravity table for a golf club head of the present invention used to measure the center of gravity along the X axis.
- FIG. 12A is an illustration of a center of gravity table for a golf club head of the present invention used to measure the center of gravity along the Y axis.
- FIG. 12B is an illustration of a center of gravity table for a golf club head of the present invention used to measure the center of gravity along the Z axis.
- FIG. 12C is an Inertia Dynamic Moment of Inertia Machine for a golf club head of the present invention and illustrates distance from the head to spin axis in the XT direction.
- FIG. 12D is an Inertia Dynamic Moment of Inertia Machine for a golf club head of the present invention and illustrates distance from the head to the spin axis in the YT direction.
- FIG. 12E is an Inertia Dynamic Moment of Inertia Machine for a golf club head of the present invention and illustrates distance from the head to the spin axis in the ZT direction.
- FIG. 13 is an illustration of the effect of the product of inertia Iyz on a lofting force from a high-center strike of a golf ball against the striking plate a golf club.
- FIG. 14 is an illustration of the effect of the product of inertia Iyz on a de-lofting force from a low-center strike of a golf ball against the striking plate a golf club.
- FIG. 15 is an illustration of the effect of the product of inertia Izy on a closing force from a off-center heel strike of a golf ball against the striking plate a golf club.
- FIG. 16 is an illustration of the effect of the product of inertia Izy on an opening force from a off-center toe strike of a golf ball against the striking plate a golf club.
- FIG. 17 is a graph of dispersion (y-axis) vs. hit location (x-axis) for a golf club having a product of inertia Iyz=0, and a golf club having a product of inertia Iyz=300.
- FIG. 18 is a schematic drawing of a face of a golf club head with the change in dispersion at three different hit locations per 100 g-cm2 increase in the product of inertia Iyz.
- FIG. 19 is a graph of dispersion (y-axis) vs. the product of inertia Iyz (x-axis) for a pattern dispersion scatter.
- FIG. 20 is a schematic drawing of a face of a golf club head with the change in dispersion at nine different hit locations per 100 g-cm2 increase in the product of inertia Iyz.
- FIG. 21 is a graph of distance (y-axis) vs. the product of inertia Iyz (x-axis).
- FIG. 22 is a schematic drawing of a face of a golf club head with the change in distance at nine different hit locations per 100 g-cm2increase in the product of inertia Iyz.
- FIG. 23 is an illustration of the effect of the product of inertia Ixy on a vertical force from a off-center heel strike of a golf ball against the striking plate a golf club.
- FIG. 24 is an illustration of the effect of the product of inertia Ixy on a vertical force from a off-center toe strike of a golf ball against the striking plate a golf club.
- FIG. 25 is an illustration of the effect of the product of inertia Ixy on a lofting force from a high-center strike of a golf ball against the striking plate a golf club.
- FIG. 26 is an illustration of the effect of the product of inertia Ixy on a de-lofting force from a low-center strike of a golf ball against the striking plate a golf club.
- FIG. 27 is a graph of distance (y-axis) vs. the product of inertia Ixy (x-axis).
- FIG. 28 is a schematic drawing of a face of a golf club head with the change in distance at nine different hit locations per 100 g-cm2 increase in the product of inertia Ixy.
- FIG. 29 is a graph of dispersion (y-axis) vs. the product of inertia Ixy (x-axis) for a pattern dispersion scatter.
- FIG. 30 is a schematic drawing of a face of a golf club head with the change in dispersion at nine different hit locations per 100 g-cm2 increase in the product of inertia Ixy.
- FIG. 31 is an illustration of the effect of the product of inertia Ixz on a vertical force from a off-center heel strike of a golf ball against the striking plate a golf club.
- FIG. 32 is an illustration of the effect of the product of inertia Ixz on a vertical force from a off-center toe strike of a golf ball against the striking plate a golf club.
- FIG. 33 is an illustration of the effect of the product of inertia Ixz on a closing force from a off-center heel strike of a golf ball against the striking plate a golf club.
- FIG. 34 is an illustration of the effect of the product of inertia Ixz on an opening force from a off-center toe strike of a golf ball against the striking plate a golf club.
- FIG. 35 is a graph of distance (y-axis) vs. the product of inertia Ixz (x-axis).
- FIG. 36 is a schematic drawing of a face of a golf club head with the change in distance at nine different hit locations per 100 g-cm2 increase in the product of inertia Ixz.
- FIG. 37 is a graph of dispersion (y-axis) vs. the product of inertia Ixz (x-axis) for a pattern dispersion scatter.
- FIG. 38 is a schematic drawing of a face of a golf club head with the change in dispersion at nine different hit locations per 100 g-cm2 increase in the product of inertia Ixz.
- FIG. 39 is a top view of the golf club of the present invention partitioned into four quadrants by the X axis and the Y axis through the center of gravity.
- FIG. 40 is a toe-side view of the golf club of the present invention partitioned into four quadrants by the X axis and the Z axis through the center of gravity.
- FIG. 41 is a front view of the golf club of the present invention partitioned into four quadrants by the Y axis and the Z axis through the center of gravity.
- FIG. 42 is a front view of the golf club of the present invention partitioned into four quadrants by the Y axis and the Z axis through the center of gravity, with a weight member positioned in quadrant I.
- FIG. 43 is a front view of the golf club of the present invention partitioned into four quadrants by the Y axis and the Z axis through the center of gravity, with a weight member positioned in quadrant II.
- As shown in FIGS.1-4, a golf club head of the present invention is generally designated 20. All of the products of inertia (Ixy, Ixz and Iyz) of the golf club head have an absolute value below 100 g-cm2. Preferably, the products of inertia Ixy, Ixz and Iyz are less than 50 g-cm2, and most preferably the products of inertia Ixy, Ixz and Iyz approach zero. The moment of inertia, Izz, about the Z axis for the
golf club head 20 of the present invention will range from 2800 g-cm2 to 5000 g-cm2, preferably from 3000 g-cm2 to 4500 g-cm2, and most preferably from 3500 g-cm2 to 4000 g-cm2. The moment of inertia, Iyy, about the Y axis for thegolf club head 20 of the present invention will range from 1500 g-cm2 to 2500 g-cm2, preferably from 1800 g-cm2 to 2100 g-cm2, and most preferably from 1900 g-cm2 to 2050 g-cm2. Thegolf club head 20 will preferably have a volume ranging from 300 cubic centimeters (“cc”) to 600 cc, and more preferably from 325 cc to 525 cc. - The
club head 20 is preferably a driver or fairway wood. In a preferred embodiment, thebody 22 has acrown 24, aface 26, a sole 28 and aribbon 30 juxtaposed by the sole 28 and thecrown 24. Theribbon 30 generally extends from atoe end 32 to aheel end 34. Theribbon 30 generally begins at one end of theface 26 and ends at an opposite end of theface 26. A rear 36 of thebody 22 is opposite theface 26 and is defined by portions of theribbon 30, thecrown 24 and the sole 28. Theribbon 30 increases the volume of theclub head 20 and also assists in creating aclub head 20 with a higher moment of inertia as described in greater detail below. Also, at theheel end 34 of theclub head 20 is aninternal hosel 38 with ashaft opening 39 for insertion of a shaft therein. - The
body 22 is composed of metals, composite materials, plastic materials and the like. In a preferred embodiment, thebody 22 is composed of a plies of carbon pre-preg (pre-impregnated) sheets, or a similar non-metallic material. In an alternative embodiment, thebody 22 is composed of a forged titanium alloy material. In another alternative embodiment, the body is composed of a forged steel material. In yet another alternative embodiment, thebody 22 is composed of a cast titanium alloy material. Those skilled in the art will recognize that thebody 22 may be composed of other materials without departing from the scope and spirit of the present invention. - The
body 22 preferably has ahollow interior 44 defined by the walls of thecrown 24,face 26, sole 28 andribbon 30. The walls of thecrown 24, sole 28 andribbon 30 are relatively thin in order to minimize mass. The thickness of the wall of theface 26 is thicker than the other walls due to the necessity to sustain impact with a golf ball. If theface 26 is composed of a metal material, it preferably has variable thickness such as disclosed in U.S. Pat. No. 5,830,084 which is hereby incorporated by reference in its entirety. - As shown in FIGS.5-7, the
club head 20 has a plurality ofweight members 40 disposed in thehollow interior 44 of theclub head 20. Theweight members 40 are positioned for location of the center of gravity, to increase the moments of inertia and to minimize the products of inertia. In a preferred embodiment, theweight members 40 are preferably embedded within layers of the plies of pre-preg as described in greater detail below. In an alternative embodiment, such as a body composed of a metal material, each of theweight members 40 is a weight compartment composed of the same material as the sole 29 for welding thereto. The weight compartment defines a chamber of a predetermined volume with a material disposed therein having a density of seven to twenty grams/cubic centimeters and weighing between three to seventy grams (bismuth is one such material). Such aweighting member 40 is disclosed in co-pending U.S. patent application Ser. No. 09/633,010, filed on Aug. 4, 2000, entitled Weighting System For Golf Club Head, which is hereby incorporated by reference in its entirety. In other embodiments, the weight member is a tungsten screw that is threadingly engaged into thebody 22 at the proper position, or a weight chip welded to thebody 22. Those skilled within the pertinent art will recognize that other means of weighting may be utilized without departing from the scope and spirit of the present invention. - As shown in FIG. 8, the
sole plate 42 is attached to the exterior surface of the sole 28 and ahosel 38 is positioned within thehollow interior 44 of theclub head 20. Thesole plate 42 is preferably composed of a metal such as aluminum, titanium or stainless steel. Thesole plate 42 weighs approximately 5 grams to 15 grams. Thehosel 38 is preferably composed of a metal such as stainless steel, or a polycarbonate material. Thehosel 38 preferably weighs 12 to 16 grams. Another embodiment, shown in FIG. 8A, has an integral sole plate and hosel such as described in U.S. Pat. No. 6,244,976, filed on Dec. 29, 1999, and entitled Integral Sole Plate And Hosel For A Golf Club Head, which is hereby incorporated by reference in its entirety. Those skilled in the pertinent art will recognize that the hosel may be an external hosel that extends upward from the heel end of a golf club head, and that such an external hosel would have an affect on the products of inertia. - The
weight members 40 are preferably composed of a film loaded with a high density metal (like tungsten), or a metal material such as copper, tungsten, steel, aluminum, tin, silver, gold, platinum, or the like. Apreferred weight member 40 is a thermoplastic material filled with a metal to an appropriate density, and the metal filler may be tungsten, brass, copper, steel, tin, or the like. Eachweight member 40 has a density greater than the material of thebody 22. Eachweight strip 40 individually weighs approximately 3 grams to 35 grams, and more preferably from 10 grams to 30 grams. In a preferred embodiment, the total combined weight of all of theweight members 40 is approximately 30 grams to 80 grams, and most preferably 60 grams. - As shown in FIG. 9, preferably one
weight member 40 is positioned in theupper ribbon 30 a in a U-like arrangement to increase the moment of inertia of thegolf club head 20. A secondbalancing weight member 40′ is positioned in the lower ribbon 30 b at thetoe end 32 of thegolf club head 20 to balance theinternal hosel 38 in order to reduce the products of inertia of thegolf club head 20 below 100 g-cm2. Theweight member 40 in theupper ribbon 30 a extends from approximately theheel end 34 of theface 26 through the rear 36 to thetoe end 32 of theface 26. However, thisweight member 40 may only extend along the rear 36 of theupper ribbon 30 a, theheel end 34 of theupper ribbon 30 a, thetoe end 32 of theupper ribbon 30 a, or any combination thereof. The balancingweight member 40′ in the lower ribbon section 30 b preferably matches the moment of inertia effect of theinternal hosel 38. - In a preferred embodiment with a
body 22 composed of a composite material, theweight member 40 is a single piece co-cured to theupper ribbon 30 a. However, two, three, four, ormore weight members 40 maybe co-cured and extend along a portion of theupper ribbon 30 a. Themultiple weight members 40 may be partitioned horizontally or vertically. For example, as shown in FIG. 9A, threeseparate weight members 40 a-c are parallel to each other and extend along substantially the entire length of theupper ribbon 30 a. In an alternative embodiment as shown in FIG. 9B,multiple weight members 40 a-j are evenly distributed along the entire length of theupper ribbon 30 a. In yet another alternative embodiment shown in FIG. 9C, threeseparate weight members 40 a-c are positioned in thetoe end 32 of theribbon 30, the rear 36 of theribbon 30, and theheel end 32 of theribbon 30. This embodiment does not have a balancingweight member 40′, however, theweight members 40 a-c vary in weight in order to have agolf club head 20 with all products of inertia (Ixy, Ixz and Iyz) below 100 g-cm2. Those skilled in the pertinent art will recognize that numerous variations for theweight members 40 are possible without departing from the scope and spirit of the present invention. - As previously stated, the preferred composite material is plies of carbon pre-preg sheets. Plies of pre-preg composite sheets are manufactured by pulling strands of fiber in a parallel motion, preferably carbon or glass fiber, through a resin film and allowing the resin to partially cure or “stage”. When the resin is partially staged, the resin holds the fibers together such that the fibers form a malleable sheet with all of the fibers in a specific orientation relative to an edge of the sheet. Exemplary carbon pre-preg fiber sheets may be obtained from Newport Composites of Santa Ana, Calif., Cytec Inc. of Anaheim, Calif., or Hexcel Inc. of Pleasonton, Calif. Alternatively, the layers41 a-c of the
composite body 22 may comprise a plurality of plies of composite fiber without any resin, each typically comprising a continuous fiber braid or mat, that are used to make a dry reinforcement preform, as described in U.S. Pat. No. 6,010,411 filed on Oct. 23, 1997, which is hereby incorporated by reference in its entirety. - The
composite body 22 may include one or more plies of pre-preg that define structurally the various walls of thegolf club head 20. Numerous other configurations may, of course, be utilized depending upon the desired structural characteristics of thegolf club head 20. One such configuration is set forth in co-pending U.S. patent application Ser. No. 09/474,670, filed on Dec. 29, 1999, entitled Composite Golf Club Head And Manufacturing Method, which is hereby incorporated by reference in its entirety. - FIGS. 10, 10A and10B illustrate the axes of inertia through the center of gravity of the golf club head. The axes of inertia are designated X, Y and Z. The X axis extends from the
striking plate 26 through the center of gravity, CG, and to the rear of thegolf club head 20. The Y axis extends from thetoe end 32 of thegolf club head 20 through the center of gravity, CG, and to theheel end 34 of thegolf club head 20. The Z axis extends from thecrown 24 through the center of gravity, CG, and to the sole 28. - As defined inGolf Club Design, Fitting, Alteration & Repair, 4th Edition, by Ralph Maltby, the center of gravity, or center of mass, of the golf club head is a point inside of the club head determined by the vertical intersection of two or more points where the club head balances when suspended. A more thorough explanation of this definition of the center of gravity is provided in Golf Club Design, Fitting, Alteration & Repair.
- The center of gravity and the moment of inertia of a
golf club head 20 are preferably measured using a test frame (XT, YT, ZT), and then transformed to a head frame (XH, YH, ZH), as shown in FIGS. 11 and 11A. The center of gravity of a golf club head may be obtained using a center of gravity table 55 having two weight scales thereon, as shown in FIGS. 12, 12A and 12B. If a shaft is present, it is removed and replaced with ahosel cube 57 that has a multitude of faces normal to the axes of thegolf club head 20. Given the weight of thegolf club head 20, the scales allow one to determine the weight distribution of the golf club head when the golf club head is placed on both scales simultaneously and weighed along a particular direction, the X, Y or Z direction. The weight scales are parallel to the earth's gravity allowing the weight distribution along each direction to be calculated to determine the location of the center of gravity where: - WAO, WBO: Weight without head (fixture)
- and
- WAH, WBH: Weight with head
- The X axis location is determined using the following equations:
- The Y axis location is determined using the following equations:
- The Z axis location is determined using the following equations:
- Once the test frame coordinates are determined, they are transformed to head frame coordinates using the following equations:
- XH cg=ZT cg
- Y H cg =X cg cos (∝lie)+Y cg sin (∝lie)−d z/tan (∝lie)
- Z H cg =X cg sin (∝lie)+Y cg cos (∝lie)+d z
-
- The moment of inertia is measured using an Inertia Dynamic Moment of
Inertia machine 59 as shown in FIGS. 12C, 12D and 12E. Themachine 59 has a rectangular plate with adapter holes spaced 0.5 inch apart from each other. The rectangular plate is mounted on themachine 59 to allow oscillation thereof. Agolf club head 20 is placed on the rectangular plate and the time for one oscillation period is measured by the machine. The oscillation time is directly related to the moment of inertia of the golf club head about the axis of rotation of the machine, which in effect is a single degree of freedom with the restoring force generated by a torsional spring. - By changing the orientation of how the golf club head is mounted on the plate, the desired moment of inertia may be measured for an axis. Nine different orientations are required to generate an inertia tensor, and since the moment of inertia measured includes the plate and the adapter, nine additional measurements are required to measure the baseline moment of inertia of the initial setup. The moment of inertia of the golf club head is the difference between the measurement taken with the golf club head, adapter and plate and the internal rotating mass of the machine, and that of the just the adapter and plate and the internal rotating mass of the machine. For the nine measurements done with the golf club head, the orientations are the same from head to head, the position on the rectangular plate depends on the center of gravity of the particular golf club head. The nine measurements without the golf club head are the same for orientation and the location of the adapter. The machine has a center of gravity and moment of inertia program to calculate the adapter holes on the rectangular plate that place the center of gravity closest to the axis of rotation, thereby minimizing error. The program uses the parallel axis theorem to account for the axis of rotation not containing the center of gravity of the golf club head. This will yield an inertia tensor about the center of gravity, which in turn allows the moment of inertia about any axis to be calculated for the golf club head.
TABLE ONE - Table One lists the location of the center of gravity, the moments of inertia about the center of gravity, and the products of inertia for prior art composite golf club heads. The moment of inertia Izz about the Z axis is less than 2436.00 g-cm2 for any of the prior art composite heads. The highest moment of inertia, Izz, about the Z axis is 2435.72 g-cm2 for the
Yonex 1 AERONA 300 composite driver. The moment of inertia, Iyy, about the Y axis is less than 1300.00 g-cm2 for any of the prior art composite heads. The highest moment of inertia, Iyy, about the Y axis is 1298.21 g-cm2 for theDaiwa 1,G 3 composite driver. The mass for all of the composite heads of Table One ranges from 186 grams to 208.5 grams. Each of the composite golf clubs of Table One that have a high moment of inertia or a volume greater than 300 cc, have at least one absolute value for the products of inertia that is over 100 g-cm2. For example, theYonex 1 AERONA 300 has the highest moment of inertia of Table One, but its product of inertia Ixy is 205.06 g-cm2. All of the absolute values of the products of inertia ofDaiwa 1, G-3 are below 100 g-cm2, but the G-3 has a golf club head volume of only 195 cc, and its highest moment of inertia is only 1951.54 g-cm2. Thus, theDaiwa 1, G-3 fails to demonstrate a golf club with a high volume or high moment of inertia and products of inertia below 100 g-cm2.TABLE TWO Club Head Mass Ixx Iyy Izz Ixy Ixz lyz Volume GBB ® 189 1802 1752 2750 212 8 99 250 9Deg BBB 9 Deg 189 2135 1763 2900 208 31 149 295 Hawk Eye ® 194 1886 1562 2607 134 −77 120 275 10 Deg Steelhead ™ 197 1722 1389 2300 238 −23 143 225 Plus 10 Deg ERC ® 188 2119 1654 2697 155 −43 120 300 - Table Two lists the moments of inertia about the center of gravity, and the products of inertia for prior art metal golf club heads from Callaway Golf Company of Carlsbad, California, beginning with the GREAT BIG BERTHA® cast titanium driver in
row 1, the BIGGEST BIG BERTHA® cast titanium driver inrow 2, the GREAT BIG BERTHA® HAWK EYE® cast titanium driver inrow 3, the BIG BERTHA® STEELHEAD PLUS™ cast stainless steel driver inrow 4, and the ERC® forged titanium driver inrow 5. The moment of inertia Izz about the Z axis is less than 2900.00 g-cm2 for any of the golf club heads of Table Two. The highest moment of inertia, Izz, about the Z axis, is 2900 g-cm2 for the CALLAWAY GOLF® BIGGEST BIG BERTHA® driver. The moment of inertia, Iyy, about the Y axis is less than 1800.00 g-cm2 for any of the club heads of Table Two. The mass for all of the club heads of Table Two ranges from 186 grams to 208.5 grams. All of the club heads of Table Two have at least one absolute value for the products of inertia that is over 100 g-cm2. For example, the products of inertia Iyz and Ixz for the GREAT BIG BERTHA® driver are under an absolute value of 100 g-cm2, but the product of inertia Ixy is over an absolute value of 100 g-cm2.TABLE THREE Head Weighting Ixx Iyy Izz Ixy Ixz Iyz Ex. 1 195 g 2700 2000 3500 75 75 75 - Table Three lists the moment of inertia and products of inertia for a
golf club head 20 of the present invention. An “unweighted” club head 20 (without the weight members 40) weighs from 90 grams to 120 grams thereby allowing for 60 grams to 105 grams of weight to be placed accordingly to achieve the reduced products of inertia for thegolf club head 20 of the present invention. The moment of inertia, Izz, about the Z axis for thegolf club head 20 of the present invention will range from 2800 g-cm2 to 5000 g-cm2, preferably from 3000 g-cm2 to 4500 g-cm2, and most preferably from 3500 g-cm2 to 4000 g-cm2. The moment of inertia, Iyy, about the Y axis for thegolf club head 20 of the present invention will range from 1500 g-cm2 to 2500 g-cm2, preferably from 1800 g-cm2 to 2100 g-cm2, and most preferably from 1900 g-cm2 to 2050 g-cm2. The product of inertia Ixy of thegolf club head 20 of thepresent invention 20 has an absolute value less than 100 g-cm2. Preferably, the product of inertia Ixy is less than 50 g-cm2, and most preferably the product of inertia Ixy approaches zero. The product of inertia Ixz of thegolf club head 20 of thepresent invention 20 has an absolute value less than 100 g-cm2. Preferably, the product of inertia Ixz is less than 50 g-cm2, and most preferably the product of inertia Ixz approaches zero. The product of inertia Iyz of thegolf club head 20 of thepresent invention 20 has an absolute value less than 100 g-cm2. Preferably, the product of inertia Iyz is less than 50 g-cm2, and most preferably the product of inertia Iyz approaches zero. - FIGS.13-38 illustrate how the products of inertia effect the distance and dispersion of a golf ball struck with a golf club.
- FIG. 13 illustrates the effects of the product of inertia, Iyz, for a lofting force from a high center hit. High center hits are defined as hits that have their impulse vector above the center of gravity of the
golf club head 20, and low center hits are defined as hits that have their impulse vector below the center of gravity of thegolf club head 20. For a high center hits, as shown in FIG. 13, the product of inertia Iyz causes a lofting moment in thegolf club head 20 which creates a closing rotation thereby leading to a slice spin in thegolf ball 63. - FIG. 14 illustrates the effects of the product of inertia, Iyz, for a de-lofting force from a low center hit. The product of inertia Iyz causes a de-lofting moment in the
golf club head 20 which creates an opening rotation thereby leading to a draw spin in thegolf ball 63. - FIG. 15 illustrates the effects of the product of inertia, Iyz, for a closing force from an off center heel hit. The product of inertia Iyz causes a closing moment in the
golf club head 20 which creates a lofting rotation thereby leading to a top spin in thegolf ball 63. - FIG. 16 illustrates the effects of the product of inertia, Iyz, for a opening force from an off center toe hit. The product of inertia Iyz causes an opening moment in the
golf club head 20 which creates a de-lofting rotation thereby leading to a back spin in thegolf ball 63. - FIG. 17 illustrates the effects of the product of inertia Iyz on the dispersion of a golf ball. A golf club having a product of inertia Iyz of zero has a relatively small dispersion for any hit location whereas golf club having a product of inertia Iyz of 300 (absolute value) has a dispersion that varies 35 feet depending on the hit location.
- FIG. 18 illustrates the effect on dispersion from increasing the product of inertia Iyz. A high center hit will have a 6.9 feet dispersion to the right (R) per 100 g-cm2 increase in Iyz, and a low center hit will have a 4.2 feet dispersion to the left (L) per 100 g-cm2 increase in Iyz.
- FIG. 19 illustrates the effect on dispersion from increasing the product of inertia Iyz for the average of a nine hit pattern. FIG. 20 illustrates the nine-hit location effect on dispersion from increasing the product of inertia Iyz.
- FIGS. 21 and 22 illustrate the effect on distance from increasing the product of inertia Iyz for the average of a nine hit pattern. For example, a high center hit will have a −0.3 yard effect on distance per 100 g-cm2 increase in Iyz, and a high toe hit will have a 1.5 yard effect on distance per 100 g-cm2 increase in Iyz.
- FIG. 23 illustrates the effects of the product of inertia Ixy for a vertical force from an off-center heel hit. The product of inertia Ixy causes a toe-up moment in the
golf club head 20 which creates a lofting rotation thereby leading to a top spin in thegolf ball 63. - FIG. 24 illustrates the effects of the product of inertia Ixy for a vertical force from an off-center toe hit. The product of inertia Ixy causes a toe-down moment in the
golf club head 20 which creates a de-lofting rotation thereby leading to a back spin in thegolf ball 63. - FIG. 25 illustrates the effects of the product of inertia Ixy for a lofting force from a high center hit. The product of inertia Ixy causes a lofting moment in the
golf club head 20 which creates a toe-up rotation thereby leading to thegolf ball 63 having a back spin for a heel hit, a top spin for a toe hit and a fade spin for a center hit. - FIG. 26 illustrates the effects of the product of inertia Ixy for a de-lofting force from a low center hit. The product of inertia Ixy causes a de-lofting moment in the
golf club head 20 which creates a toe-down rotation thereby leading to thegolf ball 63 having a back spin for a toe hit, a top spin for a heel hit and a fade spin for a center hit. - FIGS. 27 and 28 illustrate the effect on distance from increasing the product of inertia Ixy for the average of a nine hit pattern. For example, a high center hit will have a −0.3 yard effect on distance per 100 g-cm2 increase in Ixy, and a low toe hit will have a −0.9 yard effect on distance per 100 g-cm2 increase in Ixy.
- FIGS. 29 and 30 illustrate the effect on dispersion from increasing the product of inertia Ixy for the average of a nine hit pattern. For example, a high center hit will have a 3.9 feet effect to the right per 100 g-cm2 increase in Ixy, and a high toe hit will have a 2.1 feet effect to the right per 100 g-cm2 increase in Ixy.
- FIG. 31 illustrates the effects of the product of inertia Izx for a vertical force from an off-center heel hit. The product of inertia Izx causes a toe-up moment in the
golf club head 20 which creates a closing rotation thereby leading to a slice spin in thegolf ball 63. - FIG. 32 illustrates the effects of the product of inertia Izx for a vertical force from an off-center toe hit. The product of inertia Izx causes a toe-down moment in the
golf club head 20 which creates an opening rotation thereby leading to a draw spin in thegolf ball 63. - FIG. 33 illustrates the effects of the product of inertia, Izx, for a closing force from an off center heel hit. The product of inertia Izx causes a closing moment in the
golf club head 20 which creates a toe-up rotation thereby leading to a back spin in thegolf ball 63. - FIG. 34 illustrates the effects of the product of inertia, Izx, for a opening force from an off center toe hit. The product of inertia Izx causes an opening moment in the
golf club head 20 which creates a toe-down rotation thereby leading to a back spin in thegolf ball 63. - FIGS. 35 and 36 illustrate the effect on distance from increasing the product of inertia Ixz for the average of a nine hit pattern. For example, a high heel hit will have a −0.9 yard effect on distance per 100 g-cm2 increase in Ixz, and a low toe hit will have a −0.9 yard effect on distance per 100 g-cm2 increase in Ixz.
- FIGS. 37 and 38 illustrate the effect on dispersion from increasing the product of inertia Ixz for the average of a nine hit pattern. For example, a high heel hit will have a 4.5 feet effect to the right per 100 g-cm2 increase in Ixz, and a high toe hit will have a 3.9 feet effect to the left per 100 g-cm2 increase in Ixz.
- As shown in FIG. 39, the
club head 20 of the present invention is partitioned into four regions, I, II, III and IV. Mass added in either regions I or III increases the product of inertia Ixy whereas mass add in either regions II or IV decreases the product of inertia Ixy. The location at which mass is added within any given region determines the magnitude of change to Ixy. An incremental change in Ixy is determined by the amount of mass “m” added and the X and Y coordinate location of the mass (wherein X and Y are measured from the center of gravity, CG, of the golf club head 20) using the following formula: - Ixy=§§mdxdy
- As a result, adding mass along the X or Y axis has no affect on Ixy while adding mass along a diagonal line bisecting the X and Y axes results in maximal affect (additive or subtractive) on Ixy.
- As shown in FIG. 40, the
club head 20 of the present invention is partitioned into four regions, I, II, III and IV. Mass added in either regions I or III increases the product of inertia Ixz whereas mass add in either regions II or IV decreases the product of inertia Ixz. The location at which mass is added within any given region determines the magnitude of change to Ixz. An incremental change in Ixz is determined by the amount of mass “m” added and the X and Z coordinate location of the mass (wherein X and Z are measured from the center of gravity, CG, of the golf club head 20) using the following formula: - Ixz=§§mdxdz
- As a result, adding mass along the X or Z axis has no affect on Ixz while adding mass along a diagonal line bisecting the X and Z axes results in maximal affect (additive or subtractive) on Ixz.
- As shown in FIG. 41, the
club head 20 of the present invention is partitioned into four regions, I, II, III and IV. Mass added in either regions I or III increase the product of inertia Iyz whereas mass add in either regions II or IV decreases the product of inertia Iyz. The location at which mass is added within any given region determines the magnitude of change to Iyz. An incremental change in Iyz is determined by the amount of mass “m” added and the Y and Z coordinate location of the mass (wherein Y and Z are measured from the center of gravity, CG, of the golf club head 20) using the following formula: - Iyz=§§mdydz
- As a result, adding mass along the Y or Z axis has no affect on Iyz while adding mass along a diagonal line bisecting the Y and Z axes results in maximal affect (additive or subtractive) on Iyz.
- To illustrate the affect on Iyz, a five
gram weight member 40′ is added to theclub head 20 as shown in FIG. 42. The weight is added at a location in quadrant I at four centimeters along the Y axis from the center of gravity and one centimeter along Z axis from the center of gravity. Using the above formula, Iyz=§§mdydz, then Iyz=5 g*4 cm*1 cm=20 g-cm2. The precise affect of theweight member 40′ on Iyz is determined by accounting for the finite size of the mass by integrating over the area of theweight member 40′. - A second example is shown in FIG. 43 wherein the five
gram weight member 40′ is positioned at a location in quadrant II at three centimeters along the Y axis from the center of gravity and one centimeter along the Z axis below the center of gravity. Using the above formula, Iyz=§§mdydz, then Iyz=5 g*3 cm*-1 cm=−15 g-cm2. As stated above, the precise affect of theweight member 40′ on Iyz is determined by accounting for the finite size of the mass by integrating over the area of theweight member 40′. - From the foregoing it is believed that those skilled in the pertinent art will recognize the meritorious advancement of this invention and will readily understand that while the present invention has been described in association with a preferred embodiment thereof, and other embodiments illustrated in the accompanying drawings, numerous changes, modifications and substitutions of equivalents may be made therein without departing from the spirit and scope of this invention which is intended to be unlimited by the foregoing except as may appear in the following appended claims. Therefore, the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims.
Claims (20)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/916,374 US6425832B2 (en) | 1997-10-23 | 2001-07-26 | Golf club head that optimizes products of inertia |
PCT/US2002/022976 WO2003009906A1 (en) | 2001-07-26 | 2002-07-18 | Golf club head that optimizes products of inertia |
CNB028018907A CN1230232C (en) | 2001-07-26 | 2002-07-18 | Golf club head that optimizes products of inertia |
JP2002214329A JP4188017B2 (en) | 2001-07-26 | 2002-07-23 | Golf club head with optimized inertial product |
TW091116584A TW580402B (en) | 2001-07-26 | 2002-07-25 | Golf club head that optimizes products of inertia |
GB0217429A GB2378396B (en) | 2001-07-26 | 2002-07-26 | Golf club head that optimizes products of inertia |
US10/064,572 US6547676B2 (en) | 1997-10-23 | 2002-07-26 | Golf club head that optimizes products of inertia |
US10/249,451 US6669580B1 (en) | 1997-10-23 | 2003-04-10 | Golf club head that optimizes products of inertia |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/958,723 US6010411A (en) | 1997-10-23 | 1997-10-23 | Densified loaded films in composite golf club heads |
US09/474,688 US6386990B1 (en) | 1997-10-23 | 1999-12-29 | Composite golf club head with integral weight strip |
US09/796,951 US6607452B2 (en) | 1997-10-23 | 2001-02-27 | High moment of inertia composite golf club head |
US09/916,374 US6425832B2 (en) | 1997-10-23 | 2001-07-26 | Golf club head that optimizes products of inertia |
Related Parent Applications (1)
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US09/796,951 Continuation-In-Part US6607452B2 (en) | 1997-10-23 | 2001-02-27 | High moment of inertia composite golf club head |
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US10/064,572 Continuation US6547676B2 (en) | 1997-10-23 | 2002-07-26 | Golf club head that optimizes products of inertia |
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US6425832B2 US6425832B2 (en) | 2002-07-30 |
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US10/064,572 Expired - Lifetime US6547676B2 (en) | 1997-10-23 | 2002-07-26 | Golf club head that optimizes products of inertia |
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Application Number | Title | Priority Date | Filing Date |
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US10/064,572 Expired - Lifetime US6547676B2 (en) | 1997-10-23 | 2002-07-26 | Golf club head that optimizes products of inertia |
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US (2) | US6425832B2 (en) |
JP (1) | JP4188017B2 (en) |
CN (1) | CN1230232C (en) |
GB (1) | GB2378396B (en) |
TW (1) | TW580402B (en) |
WO (1) | WO2003009906A1 (en) |
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-
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- 2001-07-26 US US09/916,374 patent/US6425832B2/en not_active Expired - Lifetime
-
2002
- 2002-07-18 CN CNB028018907A patent/CN1230232C/en not_active Expired - Fee Related
- 2002-07-18 WO PCT/US2002/022976 patent/WO2003009906A1/en not_active Application Discontinuation
- 2002-07-23 JP JP2002214329A patent/JP4188017B2/en not_active Expired - Fee Related
- 2002-07-25 TW TW091116584A patent/TW580402B/en not_active IP Right Cessation
- 2002-07-26 US US10/064,572 patent/US6547676B2/en not_active Expired - Lifetime
- 2002-07-26 GB GB0217429A patent/GB2378396B/en not_active Expired - Fee Related
Cited By (8)
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US20040079775A1 (en) * | 2001-10-09 | 2004-04-29 | Robert Choi | Personal hydration system with component connectivity |
US20040089301A1 (en) * | 2001-10-09 | 2004-05-13 | Robert Choi | Personal hydration system with component connectivity |
KR100837773B1 (en) * | 2002-02-22 | 2008-06-13 | 캘러웨이 골프 컴파니 | Multiple material golf club head |
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Also Published As
Publication number | Publication date |
---|---|
US6425832B2 (en) | 2002-07-30 |
CN1230232C (en) | 2005-12-07 |
US20030040376A1 (en) | 2003-02-27 |
TW580402B (en) | 2004-03-21 |
WO2003009906A1 (en) | 2003-02-06 |
US6547676B2 (en) | 2003-04-15 |
GB0217429D0 (en) | 2002-09-04 |
GB2378396B (en) | 2005-02-02 |
CN1463196A (en) | 2003-12-24 |
JP4188017B2 (en) | 2008-11-26 |
GB2378396A (en) | 2003-02-12 |
JP2003088602A (en) | 2003-03-25 |
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