The present application relates to a golf club head, and more particularly, to a golf club head having improved mass distribution characteristics.
Golf club head manufacturers and designers are constantly looking for ways to improve golf club head performance, which includes the forgiveness and playability of the golf club head, while having an aesthetic appearance. Generally, “forgiveness” can be defined as the ability of a golf club head to compensate for mishits, i.e., hits resulting from striking the golf ball at a less than an ideal impact location on the golf club head. Similarly, “playability” can be defined generally as the ease in which a golfer having any of various skill levels can use the golf club head for producing quality golf shots.
Golf club head performance can be directly affected by the moments of inertia of the club head. A moment of inertia is the measure of a club head's resistance to twisting upon impact with a golf ball. Generally, the higher the moments of inertia of a golf club head, the less the golf club head twists at impact with a golf ball, particularly during “off-center” impacts with a golf ball. The less a golf club head twists, the greater the forgiveness of the golf club head and the greater the probability of hitting a straight golf shot. In some instances, a golf club head with high moments of inertia may also result in an increased ball speed upon impact with the golf club head, which generally translates into increased golf shot distance.
In general, the moment of inertia of a mass about a given axis is proportional to the square of the distance of the mass away from the axis. In other words, the greater is the distance of a mass away from a given axis, the greater is the moment of inertia of the mass about the given axis. To reduce ball speed-loss on off-center golf shots, golf club head designers and manufacturers have sought to increase the moment of inertia about a golf club head z-axis extending vertically through the golf club head center of gravity, i.e., Izz. By increasing the distance of the outer periphery of the golf club head from the vertical axis, e.g., the further the golf club head extends outward away from the vertical axis, the greater the moment of inertia (Izz), and the lesser the golf club head twists about the vertical axis upon impact with a golf ball and the greater the forgiveness of the golf club head.
United States Golf Association (USGA) regulations and constraints on golf club head shapes, sizes and other characteristics tend to limit the moments of inertia achievable by a golf club head. For example, the highest moment of inertia (Izz) allowable by the USGA is currently 5,900 g·cm2 (590 kg·mm2).
Because of increased demand by golfers to hit straighter and longer golf shots, golf club manufacturers recently have produced golf club heads that increasingly approach the maximum allowed moment of inertia (Izz). Although golf club heads with high moments of inertia (Izz) may provide greater left-to-right shot shape forgiveness, such benefits are contingent upon the golfer being able to adequately square up the club face prior to impacting the golf ball. For example, if the golf club head face is too open on impact with a golf ball, the ball will have a tendency to fade or slice. The harder it is to rotate the golf club head during a swing, the more difficult it is to square the golf club head prior to impact with a golf ball and the greater the tendency to hit errant golf shots. Often, the bulkiness or size of a golf club head can negatively affect the ability of a golfer to rotate the golf club head into proper impact position. In other words, because the mass of bulkier golf club heads is distributed further away from the hosel and shaft, the moment of inertia about the shaft is increased making it harder it is to rotate the golf club head about the shaft during a swing.
Conventional golf club heads approaching the maximum allowable moment of inertia (Izz), tend to be bulkier than club heads with lower moments of inertia due to the outward extend of the periphery of the golf club head. Although the bulkiness of the golf club heads may provide a higher moment of inertia (Izz) for greater forgiveness, such benefits tend to diminish as the bulkiness of the golf club head makes it harder for a golfer to square up the golf club head. In other words, the high forgiveness of the golf club head can be negated by the inability of the golfer to square the club face due to the bulkiness of the golf club head.
Described herein are embodiments of a golf club head with less bulk than some conventional high moment of inertia golf club heads but providing increased forgiveness due to a cooperative combination of moments of inertia about respective axes of the golf club head.
According to one embodiment, a golf club head comprises a body and a face. The body can define an interior cavity and comprise a sole positioned at a bottom portion of the golf club head, a crown positioned at a top portion, and a skirt positioned around a periphery between the sole and crown. The body can have a forward portion and a rearward portion. The face can be positioned at the forward portion of the body and have an ideal impact location that defines a golf club head origin. The head origin can include an x-axis tangential to the face and generally parallel to the ground when the head is ideally positioned, a y-axis generally perpendicular to the x-axis and generally parallel to the ground when the head is ideally positioned, and a z-axis perpendicular to both the x-axis and y-axis. The golf club head can have a moment of inertia about a golf club head center of gravity z-axis generally parallel to the head origin z-axis greater than approximately 500 kg·mm2. Further, the ratio of a moment of inertia about a golf club head center of gravity x-axis generally parallel to the origin x-axis to the moment of inertia about the golf club head center of gravity z-axis (Ixx/Izz) is greater than approximately 0.6.
In some implementations, the ratio Ixx/Izz is greater than approximately 0.7. In other implementations, the ratio Ixx/Izz is greater than approximately 0.8. The moment of inertia about the golf club head center of gravity x-axis can be between approximately 330 kg·mm2 and approximately 550 kg·mm2.
The foregoing and other features and advantages of the disclosed golf club head will become more apparent from the following detailed description, which proceeds with reference to the accompanying figures.
In the following description, certain terms may be used such as “up,” “down,”, “upper,” “lower,” “horizontal,” “vertical,” “left,” “right,” and the like. These terms are used, where applicable, to provide some clarity of description when dealing with relative relationships, particularly with respect to the illustrated embodiments. These terms are not, however, intended to imply absolute relationships, positions, and/or orientations. For example, with respect to an object, an “upper” surface can become a “lower” surface simply by turning the object over. Nevertheless, it is still the same object.
As illustrated in
The crown 12 is defined as an upper portion of the club head (1) above a peripheral outline 34 of the club head as viewed from a top-down direction; and (2) rearwards of the topmost portion of a ball striking surface 22 of the striking face 18 (see
The sole 14 is defined as a lower portion of the club head 2 extending upwards from a lowest point of the club head when the club head is ideally positioned, i.e., at a proper address position relative to a golf ball on a level surface. In some implementations, the sole 14 extends approximately 50% to 60% of the distance from the lowest point of the club head to the crown 12, which in some instances, can be approximately 15 mm for a driver and between approximately 10 mm and 12 mm for a fairway wood.
A golf club head, such as the club head 2, is at its proper address position when angle 15 (see
The skirt 16 includes a side portion of the club head 2 between the crown 12 and the sole 14 that extends across a periphery 34 of the club head, excluding the striking surface 22, from the toe portion 28, around the rear portion 32, to the heel portion 26.
In the illustrated embodiment, the ideal impact location 23 of the golf club head 2 is disposed at the geometric center of the striking surface 22 (see
In some embodiments, the striking face 18 is made of a composite material such as described in U.S. Patent Application Publication Nos. 2005/0239575 and 2004/0235584, U.S. patent application Ser. No. 11/642,310, and U.S. Provisional Patent Application No. 60/877,336, which are incorporated herein by reference. In other embodiments, the striking face 18 is made from a metal alloy (e.g., titanium, steel, aluminum, and/or magnesium), ceramic material, or a combination of composite, metal alloy, and/or ceramic materials. Further, the striking face 18 can be a striking plate having a variable thickness such as described in U.S. Pat. No. 6,997,820, which is incorporated herein by reference.
The crown 12, sole 14, and skirt 16 can be integrally formed using techniques such as molding, cold forming, casting, and/or forging and the striking face 18 can be attached to the crown, sole and skirt by means known in the art. For example, the striking face 18 can be attached to the body 10 as described in U.S. Patent Application Publication Nos. 2005/0239575 and 2004/0235584. The body 10 can be made from a metal alloy (e.g., titanium, steel, aluminum, and/or magnesium), composite material, ceramic material, or any combination thereof. The wall 72 of the golf club head 2 can be made of a thin-walled construction, such as described in U.S. application Ser. No. 11/067,475, filed Feb. 25, 2005, which is incorporated herein by reference. For example, in some implementations, the wall can have a thickness between approximately 0.65 mm and approximately 0.8 mm. In one specific implementation, the wall 72 of the crown 12 and skirt 16 has a thickness of approximately 0.65 mm, and the wall of the sole 14 has a thickness of approximately 0.8 mm.
A club head origin coordinate system may be defined such that the location of various features of the club head (including, e.g., a club head center-of-gravity (CG) 50 (see
Referring to
In one embodiment, the golf club head can have a CG with an x-axis coordinate between approximately −2 mm and approximately 6 mm, a y-axis coordinate between approximately 33 mm and approximately 41 mm, and a z-axis coordinate between approximately −7 mm and approximately 1 mm. Referring to
Referring to
In certain embodiments, the club head 2 includes a rib 82 extending along an interior surface of the sole 14 and skirt 16 generally parallel to the striking face 18. In some instances, the rib 82 provides structural rigidity to the club head 2 and vibrational dampening. Although club head 2 includes a single rib 82, in some implementations, the club head 2 includes multiple ribs 82. Further, in some implementations, the rib 82 extends along only the sole 14 or includes two spaced-apart portions each extending along the skirt 16 on separate sides of the club head.
Referring to
A moment of inertia about the golf club head CG x-axis 90 is calculated by the following equation
Ixx=∫(y2+z2)dm (1)
where y is the distance from a golf club head CG xz-plane to an infinitesimal mass dm and z is the distance from a golf club head CG xy-plane to the infinitesimal mass dm. The golf club head CG xz-plane is a plane defined by the golf club head CG x-axis 90 and the golf club head CG z-axis 85. The CG xy-plane is a plane defined by the golf club head CG x-axis 90 and the golf club head CG y-axis 95.
A moment of inertia about the golf club head CG z-axis 85 is calculated by the following equation
Izz=∫(x2+y2)dm (2)
where x is the distance from a golf club head CG yz-plane to an infinitesimal mass dm and y is the distance from the golf club head CG xz-plane to the infinitesimal mass dm. The golf club head CG yz-plane is a plane defined by the golf club head CG y-axis 95 and the golf club head CG z-axis 85.
As the moment of inertia about the CG z-axis (Izz) is an indication of the ability of a golf club head to resist twisting about the CG z-axis, the moment of inertia about the CG x-axis (Ixx) is an indication of the ability of the golf club head to resist twisting about the CG x-axis. The higher the moment of inertia about the CG x-axis (Ixx), the greater the forgiveness of the golf club head on high and low off-center impacts with a golf ball. In other words, a golf ball hit by a golf club head on a location of the striking surface 18 above the ideal impact location 23 causes the golf club head to twist upwardly and the golf ball to have a higher launch angle and lower spin than desired. Similarly, a golf ball hit by a golf club head on a location of the striking surface 18 below the ideal impact location 23 causes the golf club head to twist downwardly and the golf ball to have a lower launch angle and higher spin than desired. Both high and low off-center hits also cause loss of ball speed compared to centered hits. Increasing the moment of inertia about the CG x-axis (Ixx) reduces upward and downward twisting of the golf club head to reduce the negative effects of high and low off-center impacts.
As discussed above, many conventional golf club heads are designed to achieve a moment of inertia about the CG z-axis (Izz) that approaches the maximum moment of inertia allowable by the USGA in order to increase straightness of the shot and reduce ball speed-loss, i.e., forgiveness on heel and toe off-center hits. However, few, if any, conventional golf club heads are designed to achieve a high moment of inertia about the CG x-axis (Ixx) in conjunction with a high moment of inertia about the CG z-axis (Izz). Moreover, the prior art does not recognize the need to, nor the advantages associated with, configuring a golf club head to have an increased moment of inertia about the CG x-axis (Ixx) while maintaining a specific ratio of the moment of inertia about the CG x-axis (Ixx) to the moment of inertia about the CG z-axis, i.e., Ixx/Izz.
Increasing the moment of inertia about the CG x-axis (Ixx) typically does not involve distributing additional mass away from the hosel and shaft. Accordingly, the moment of inertia about the CG x-axis (Ixx) can be increased without significantly affecting the ability of a golfer to square the club head at impact. Therefore, a golf club head can have a moderately high moment of inertia about the CG z-axis (Izz) and an increased moment of inertia about the CG x-axis (Ixx) to provide a golf club head with a high forgiveness on high, low, heel and toe off-center impacts without negatively impacting a golfer's ability to square the golf club head. Further, a given head design offers only so much discretionary mass that can be used to achieve specific moments of inertia, e.g., moment of inertia about the CG x-axis (Ixx) and/or moment of inertia about the CG z-axis (Izz). Thus, it is often not desirable to utilize all or most of the discretionary mass to achieve a selected moment of inertia about the CG z-axis (Izz), in part because increases in moment of inertia about the CG z-axis (Izz) beyond about 500 kg·mm2 accrue proportionately less benefit. In such instances, it is often desirable to maintain moment of inertia about the CG z-axis (Izz) and redistribute mass to achieve an increase in moment of inertia about the CG x-axis (Ixx) and thus an increase in the ratio of moment of inertia about the CG x-axis (Ixx) to moment of inertia about the CG z-axis (Izz).
As moments of inertia are proportional to the square of the distance of the mass away from an axis of rotation, according to several embodiments, golf club heads described herein can include one or more localized or discrete mass elements positioned at strategic locations about the golf club head to affect the moments of the inertia of the head without increasing the bulk of the golf club head. Further, in some embodiments, using localized or discrete mass elements in conjunction with body a made of a thin-walled construction can provide desirable mass properties without the need for composite materials, which can lead to increased material and manufacturing costs.
Referring to
The mass elements 74, 76 can be positioned within the interior cavity 79 and secured to, or be formed integrally with, respective inner surfaces of wall 72 or striking face 18. As shown, the mass elements 74, 76 are formed integrally with, and extend inwardly from, wall 72 or striking face 18 of body 10 to form a localized area of increased or built-up wall thickness. The heel mass element 74 is positioned on the skirt 14 at the heel portion 26 of the golf club head 2 proximate the front portion 30. The rear mass element 76 extends inwardly from the sole 14, skirt 16, and crown 12 and is positioned proximate the rear portion 32 of the golf club head 2.
The location of each mass element 74, 76 on the golf club head can be defined as the location of the center of gravity of the mass element relative to the club head origin coordinate system. For example, in some implementations, the heel mass element 74 has an origin x-axis coordinate between approximately 35 mm and approximately 65 mm, an origin y-axis coordinate between approximately 0 mm and approximately 30 mm, and an origin z-axis coordinate between approximately −20 mm and approximately 10 mm. In one specific implementation, the heel mass element 74 has an origin x-axis coordinate of approximately 50 mm, an origin y-axis coordinate of approximately 15 mm, and an origin z-axis coordinate of approximately −3 mm. Similarly, in some implementations, the rear mass element 76 has an origin x-axis coordinate between approximately −20 mm and approximately 10 mm, an origin y-axis coordinate between approximately 90 mm and approximately 120 mm, and an origin z-axis coordinate between approximately −20 mm and approximately 10 mm. In one specific implementation, the rear mass element 76 has an origin x-axis coordinate of approximately −7 mm, an origin y-axis coordinate of approximately 106 mm, and an origin z-axis coordinate of approximately −3 mm.
Further, the mass elements 74, 76 can have any one of various masses. For example, in some implementations, the heel mass element 74 has a mass between about 3 g and about 23 g and the rear mass element 76 has a mass between about 15 g and about 35 g. In one specific implementation, the heel mass element 74 has a mass of approximately 6 g and the rear mass element 76 has a mass of approximately 24 g.
The configuration of the golf club head 2, including the locations and mass of the mass elements 74, 76, can, in some implementations, result in the club head 2 having a moment of inertia about the CG z-axis (Izz) between about 450 kg-mm2 and about 600 kg-mm2, and a moment of inertia about the CG x-axis (Ixx) between about 280 kg·mm2 and about 400 kg·mm2. In one specific implementation having the mass element locations and masses indicated in
Referring to
Unless otherwise noted, the general details and features of the body 110 of golf club head 100 can be understood with reference to the same or similar features of the body 10 of golf club head 2.
The sole 114 extends upwardly from the lowest point of the golf club head 100 a shorter distance than the sole 14 of golf club head 2. For example, in some implementations, the sole 114 extends upwardly approximately 20% to 40% of the distance from the lowest point of the club head 100 to the crown 112, which in some instances, can be approximately 15 mm for a driver and between approximately 10 mm and approximately 12 mm for a fairway wood. Further, the sole 114 comprises a substantially flat portion 119 extending horizontal to the ground 117 when in proper address position. In some implementations, the bottommost portion of the sole 114 extends substantially parallel to the ground 117 between approximately 70% and approximately 40% of the depth (Dch) of the golf club head 100.
Because the sole 114 of golf club head 100 is shorter than the sole 12 of golf club head 2, the skirt 116 is taller, i.e., extends a greater approximately vertical distance, than the skirt 16 of golf club head 2. In at least one implementation, the golf club head 100 includes a weight port 140 formed in the skirt 116 proximate the rear portion 132 of the club head (see
In some implementations, the striking surface 122 golf club head 100 has a height (Hss) between approximately 50 mm and approximately 65 mm, and a width (Wss) between approximately 80 mm and approximately 100 mm. Referring to
In one embodiment, the golf club head 100 has a CG with an x-axis coordinate between approximately −2 mm and approximately 6 mm, a y-axis coordinate between approximately 33 mm and approximately 41 mm, and a z-axis coordinate between approximately −8 mm and approximately 0 mm. Referring to
In some implementations, the golf club head 100 has a height (Hch) between approximately 55 mm and approximately 75 mm, a width (Wch) between approximately 110 mm and approximately 130 mm, and a depth (Dch) between approximately 110 mm and approximately 130 mm. Referring to
Referring to
Like mass elements 74, 76, the mass elements 174, 176 can have any one of various masses. For example, in some implementations, the heel mass element 174 has a mass between about 3 g and about 23 g and the rear mass element 176 has a mass between about 10 g and about 30 g. In one specific implementation, the heel mass element 174 has a mass of approximately 6 g and the rear mass element 176 has a mass of approximately 19 g.
The configuration of the golf club head 100, including the locations and mass of the mass elements 174, 176, can, in some implementations, result in the club head having a moment of inertia about the CG z-axis (Izz) between about 450 kg·mm2 and about 600 kg·mm2, and a moment of inertia about the CG x-axis (Ixx) between about 280 kg·mm2 and about 400 kg·mm2. In one specific implementation having mass element locations and masses indicated in
Referring to
Unless otherwise noted, the general details and features of the body 210 of golf club head 200 can be understood with reference to the same or similar features of the body 10 of golf club head 2 and body 110 of golf club head 100.
Like sole 114 of golf club head 100, the sole 214 extends upwardly approximately 20% to 40% of the distance from the lowest point of the club head 200 to the crown 212. Therefore, the skirt 216 is taller, i.e., extends a greater approximately vertical distance, than the skirt 16 of golf club head 2.
In at least one implementation, and shown in
In some implementations, the striking surface 222 golf club head 200 has a height (Hss) between approximately 50 mm and approximately 65 mm, and a width (Wss) between approximately 80 mm and approximately 100 mm. Referring to
In one embodiment, the golf club head 200 has a CG with an x-axis coordinate between approximately −2 mm and approximately 6 mm, a y-axis coordinate between approximately 33 mm and approximately 41 mm, and a z-axis coordinate between approximately −8 mm and approximately 0 mm. Referring to
In some implementations, the golf club head 200 has a height (Hch) between approximately 55 mm and approximately 75 mm, a width (Wch) between approximately 110 mm and approximately 130 mm, and a depth (Dch) between approximately 110 mm and approximately 130 mm. Referring to
Referring to
Like mass elements 74, 76, the mass elements 274, 276 can have any one of various masses or weights. For example, in some implementations, the heel mass element 274 has a mass between about 3 g and about 23 g and the rear mass element 276 has a mass between about 5 g and about 25 g. In one specific implementation, the heel mass element 274 has a mass of approximately 5 g and the rear mass element 276 has a mass of approximately 8 g.
The configuration of the golf club head 200, including the locations and mass of the mass elements 274, 276, can, in some implementations, result in the club head having a moment of inertia about the CG z-axis (Izz) between about 450 kg·mm2 and about 600 kg·mm2, and a moment of inertia about the CG x-axis (Ixx) between about 280 kg·mm2 and about 400 kg·mm2. In one specific implementation having mass element locations and masses indicated in
Referring to
Unless otherwise noted, the general details and features of the body 310 of golf club head 300 can be understood with reference to the same or similar features of the body 10 of golf club head 2, body 110 of golf club head 100 and body 210 of golf club head 200.
Like soles 114, 214, the sole 314 extends upwardly approximately 20% to 40% of the distance from the lowest point of the club head 300 to the crown 312. Like skirts 116, 216, the skirt 316 is taller, i.e., extends a greater approximately vertical distance, than the skirt 16 of golf club head 2. However, unlike, skirts 116, 216, skirt 316 includes an inverted portion 352 having a substantially concave outer surface 336 extending about at least a substantial portion of the toe portion 328 of the golf club head 300.
Similar to the golf club head described in U.S. patent application Ser. No. 11/565,485, which is incorporated herein by reference, golf club head 300 includes a rib 350 that has an external portion 356 and two internal portions 358, 360 (see
In some implementations, the striking surface 322 golf club head 300 has a height (Hss) between approximately 50 mm and approximately 65 mm, and a width (Wss) between approximately 80 mm and approximately 100 mm. Referring to
In one embodiment, the golf club head 300 has a CG with an x-axis coordinate between approximately −2 mm and approximately 6 mm, a y-axis coordinate between approximately 33 mm and approximately 41 mm, and a z-axis coordinate between approximately −6 mm and approximately 2 mm. Referring to
In some implementations, the golf club head 300 has a height (Hch) between approximately 53 mm and approximately 73 mm, a width (Wch) between approximately 105 mm and approximately 125 mm, and a depth (Dch) between approximately 105 mm and approximately 125 mm. Referring to
Referring to
In some implementations, the heel mass element 374 has an origin x-axis coordinate between approximately 35 mm and approximately 65 mm, an origin y-axis coordinate between approximately 10 mm and approximately 40 mm, and an origin z-axis coordinate between approximately 0 mm and approximately 20 mm. In one specific implementation, the heel mass element 374 has an origin x-axis coordinate of approximately 53 mm, an origin y-axis coordinate of approximately 21 mm, and an origin z-axis coordinate of approximately 7 mm. Similarly, in some implementations, the rear mass element 376 has an origin x-axis coordinate between approximately −25 mm and approximately 5 mm, an origin y-axis coordinate between approximately 90 mm and approximately 120 mm, and an origin z-axis coordinate between approximately −5 mm and approximately 25 mm. In one specific implementation, the rear mass element 376 has an origin x-axis coordinate of approximately −10 mm, an origin y-axis coordinate of approximately 109 mm, and an origin z-axis coordinate of approximately 10 mm.
Like mass elements 74, 76, the mass elements 374, 376 can have any one of various masses or weights. For example, in some implementations, the heel mass element 374 has a mass between about 5 g and about 25 g and the rear mass element 376 has a mass between about 10 g and about 30 g. In one specific implementation, the heel mass element 374 has a mass of approximately 11 g and the rear mass element 376 has a mass of approximately 21 g.
The configuration of the golf club head 300, including the locations and mass of the mass elements 374, 376, can, in some implementations, result in the club head having a moment of inertia about the CG z-axis (Izz) between about 450 kg·mm2 and about 600 kg·mm2, and a moment of inertia about the CG x-axis (Ixx) between about 280 kg·mm2 and about 400 kg·mm2. In one specific implementation having mass element locations and masses indicated in
One specific exemplary implementation of a golf club head 400 having a generally rectangular ball striking face with a corresponding rectangular ball striking surface 410 is shown in
In the illustrated embodiment, the edges, or intersections, between the sides 422, 424, 426, 428, striking surface 410 and end 440 appear relatively sharp. Of course, any one or more of the sharp edges between the sides, striking surface and end can be eased or radiused without departing from the general relationships. In general, the golf club head 400 has a generally pyramidal, prismatic, pyramidal frustum, or prismatic frustum shape. When viewed from above, or in plan view, the golf club head has a generally triangular or trapezoidal shape.
In one specific implementation, for optimum forgiveness and playability, the ball striking surface 410 has the maximum allowable surface area under current USGA dimensional constraints for golf club heads. In other words, the ball striking surface 410 has a maximum height (H) of approximately 71 mm (2.8 inches) and a maximum width (W) of approximately 125 mm (5 inches). Accordingly, the ball striking surface 410 has an area of approximately 8,875 mm2. In other embodiments, the ball striking surface 410 may have a maximum height (H) between about 67 mm to about 71 mm, a maximum width (W) between about 118 mm to about 125 mm, and a corresponding ball striking surface area of between about 7,900 mm2 to about 8,875 mm2.
In certain implementations, the golf club head 400 has a maximum depth (D) equal to the maximum allowable depth under current USGA dimensional constraints, i.e., approximately 125 mm. In other embodiments, the golf club head 400 may have a maximum depth (D) between about 118 mm to about 125 mm. In some implementations, the golf club head 400 has a volume equal to the maximum allowable volume under current USGA dimensional constraints, i.e., approximately 460 cm3. The area of the square end 440 may range from about 342 mm2 to about 361 mm2.
The golf club head 400 includes one or more discrete mass elements. For example, in the illustrated embodiments, the golf club head 400 includes three discrete mass elements: heel mass element 474, rear mass element 476 and toe mass element 478. Each mass element 474, 476, 478 is defined by its location about the golf club head 400 and mass. The location of the mass elements about the golf club head are described according to the coordinates of the mass element CG on the golf club head origin coordinate system.
The golf club head 400 can be configured according to any one of various configurations, e.g., golf club head configurations 400A-400G, each having a unique mass element location and weight to achieve specific moments of inertia Ixx and Izz, and a specific Ixx/Izz ratio. The body 420 of each configuration 400A-400G is constructed of a composite material and the total mass of the golf club head 400 of each configuration 400A-400G is approximately 203 g.
Referring to
As indicated in
As perhaps a more preferable configuration compared to configuration 400A, golf club head configuration 400B can be accomplished by configuring the golf club head to have a toe mass element 478 that is closer to the heel mass element 474 than configuration 400A. The resultant golf club head configuration 400B has the same moment of inertia about the CG x-axis (Ixx) as configuration 400A, but has a moment of inertia about the CG z-axis (Izz), i.e., approximately 593 kg·mm2, that is less than configuration 400A to achieve a slightly higher Ixx/Izz ratio of approximately 0.72. Although golf club head configuration 400B has a lower moment of inertia about the CG z-axis (Izz) than configuration 400B, the moment of inertia is still sufficiently high to provide high forgiveness for left/right off-center hits, while allowing a golfer to more easily square the golf club head prior to impact.
For more ease in squaring the golf club head prior to impact, configuration 400C includes heel and toe mass elements 474, 478 that are closer to each other than configuration 400B to reduce the moment of inertia about the CG z-axis (Izz) and maintain the moment of inertia about the CG x-axis (Ixx) compared to configuration 400C. Accordingly, configuration 400C maintains a very high moment of inertia about the CG x-axis (Ixx) for alleviating the negative effects of high/low impacts and achieves a high moment of inertia about the CG z-axis (Izz) for alleviating the negative effects of right/left impacts. The resultant Ixx/Izz ratio of configuration 400C of approximately 0.96 is significantly higher than the ratio of configuration 400B.
Configuration 400D has a moment of inertia about its z-axis (Izz) and an Ixx/Izz ratio that falls between configuration 400B and configuration 400C.
Configurations 400E-400G follow a similar pattern compared to configurations 400B-400D. More specifically, configuration 400F has a moment of inertia about its z-axis (Izz) and an Ixx/Izz ratio that falls between configuration 400E and configuration 400G. However, the configurations 400E-400G differ from configurations 400B-400D in several respects. Most significantly, the heel and toe mass elements 474, 478 of respective configurations 400E-400G have less weight than the heel and toe mass elements 474, 478 of respective configurations 400B-400D. Additionally, the rear mass elements 476 of respective configurations 400E-400G have more weight than the rear mass elements 476 of respective configurations 400B-400D. In other words, more weight is concentrated in the rear of configurations 400E-400G than in configurations 400B-400D. The result is that the configurations 400E-400G have moments of inertia about respective CG x-axes (Ixx) that are significantly higher than the same moments of inertia achieved by configurations 400B-400C, while the Ixx/Izz ratios of corresponding configurations remain proportionally similar.
Referring to
In view of the many possible embodiments to which the principles of the disclosed golf club head may be applied, it should be recognized that the illustrated embodiments are only preferred examples and should not be taken as limiting the scope of the disclosed golf club head. Rather, the scope of the invention is defined by the following claims. We therefore claim as our invention all that comes within the scope and spirit of these claims and their equivalents.
This application is a continuation of U.S. patent application Ser. No. 17/107,474, filed Nov. 30, 2020, now U.S. Pat. No. 11,278,773, which is a continuation of U.S. patent application Ser. No. 16/752,397, filed Jan. 24, 2020, now U.S. Pat. No. 10,874,918, which is a continuation of U.S. patent application Ser. No. 16/241,826, filed Jan. 7, 2019, now U.S. Pat. No. 10,576,338, which is a continuation of U.S. patent application Ser. No. 15/827,848, filed Nov. 30, 2017, now U.S. Pat. No. 10,220,270, which is a continuation of U.S. patent application Ser. No. 15/240,769, filed Aug. 18, 2016, now U.S. Pat. No. 9,849,353, which is a continuation of U.S. patent application Ser. No. 14/177,094, filed Feb. 10, 2014, now U.S. Pat. No. 9,452,324, which is a continuation of U.S. patent application Ser. No. 12/775,359, filed May 6, 2010, now U.S. Pat. No. 8,647,216, which is a continuation of U.S. patent application Ser. No. 11/863,198, filed Sep. 27, 2007, now U.S. Pat. No. 7,731,603, all of which are incorporated herein by reference.
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1526438 | Scott | Feb 1925 | A |
1538312 | Beat | May 1925 | A |
1592463 | Marker | Jul 1926 | A |
1658581 | Tobia | Feb 1928 | A |
1704119 | Buhrke | Mar 1929 | A |
2214356 | Wettlaufer | Sep 1940 | A |
2225930 | Sexton | Dec 1940 | A |
2360364 | Reach | Oct 1944 | A |
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Number | Date | Country | |
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20220241654 A1 | Aug 2022 | US |
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Child | 17586960 | US | |
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Child | 17107474 | US | |
Parent | 16241826 | Jan 2019 | US |
Child | 16752397 | US | |
Parent | 15827848 | Nov 2017 | US |
Child | 16241826 | US | |
Parent | 15240769 | Aug 2016 | US |
Child | 15827848 | US | |
Parent | 14177094 | Feb 2014 | US |
Child | 15240769 | US | |
Parent | 12775359 | May 2010 | US |
Child | 14177094 | US | |
Parent | 11863198 | Sep 2007 | US |
Child | 12775359 | US |