EP2910286B1 - Golf club head with a wave sole - Google Patents

Golf club head with a wave sole Download PDF

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Publication number
EP2910286B1
EP2910286B1 EP15156225.3A EP15156225A EP2910286B1 EP 2910286 B1 EP2910286 B1 EP 2910286B1 EP 15156225 A EP15156225 A EP 15156225A EP 2910286 B1 EP2910286 B1 EP 2910286B1
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EP
European Patent Office
Prior art keywords
club head
wave
height
sidewall
ball
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Active
Application number
EP15156225.3A
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German (de)
English (en)
French (fr)
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EP2910286A1 (en
Inventor
David Llewellyn
Kei Tsuji
Arata Kamo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mizuno Corp
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Mizuno Corp
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Publication date
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Publication of EP2910286A1 publication Critical patent/EP2910286A1/en
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Publication of EP2910286B1 publication Critical patent/EP2910286B1/en
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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
    • A63B53/0466—Heads wood-type
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • 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
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations

Definitions

  • the invention relates generally to golf club heads and, more particularly, to a wood-type golf club head with a wave sole feature.
  • JP 2013-165962 A describes several possibilities how the center of gravity can be altered in a gold club head, in particular in a wood golf club head.
  • the body of club head 10 may include a ball striking face 12, a sole 14, and a slot 16.
  • the slot 16 has sidewalls 18 having a height 19, and an upper wall 20 having a width 21. Because it adds flexibility to the face 12, the slot 16 can also improve the coefficient of restitution (COR), which can result in improved ball launch properties.
  • COR coefficient of restitution
  • slot structures are typically selected for ease of manufacture, but they do not provide optimized ball launch conditions. Furthermore, as discussed above, the design of these slot structures is limited because attempting to cast a thicker wall or deeper slots, for example, can cause casting defects and other manufacturing issues. As a result of these limitations, traditional slot designs are limited in the extent to which they can improve the COR and move the COG.
  • Embodiments of the present invention relate to a wood-type golf club, and particularly to a golf club according to the present disclosure comprising a club head having a ball-striking face, a crown, and a sole.
  • the sole can include a slot for adding additional weight to the club head of the golf club.
  • a slot according to the present disclosure can include a wave feature having one or more wave shapes formed in the slot region of the sole.
  • the golf club head can comprise a body defining an interior cavity and including a ball-striking face and a sole.
  • a wave slot can be located on the sole and can comprise a first sidewall, a second sidewall, and at least one wave.
  • the first sidewall extends substantially in a first generally upward direction and is located proximate the ball-striking face
  • the second sidewall extends substantially in the second generally upward direction and is located opposite to the ball-striking face when viewed from the first sidewall.
  • the first and second sidewalls are disposed at an acute angle to one another.
  • the waves are positioned between the first and second sidewalls, and can comprise a valley portion that does not protrude below the sole.
  • the first generally upward direction refers to a direction away from the ground (a direction away from the sole) when the golf club head is placed on the ground such that the sole is in contact with the ground, and may include a direction perpendicular to the ground and a direction inclined with respect to the ground.
  • a direction away from the sole and also gradually away from the ball-striking face (a direction inclined toward the rear side with respect to the sole) may be used as the aforementioned first generally upward direction.
  • the second generally upward direction refers to a direction away from the ground (a direction away from the sole) when the golf club head is placed on the ground such that the sole is in contact with the ground, and may include a direction perpendicular to the ground and a direction inclined with respect to the ground.
  • a direction away from the sole and also gradually approaching the ball-striking face (a direction inclined toward the front side (the ball-striking face side) with respect to the sole) may be used as the aforementioned second generally upward direction.
  • the wave slot can comprise two waves of substantially equal height.
  • a height of the first sidewall can be substantially equal to a height of the second sidewall.
  • the wave slot comprises a first wave having a first height and a second wave having a second height, wherein the second height is greater than the first height, when the second wave is located proximate the first sidewall and the first wave is located proximate the second sidewall.
  • the height of the first sidewall can be greater than the height of the second sidewall, while in other embodiments the height of the second sidewall can be greater than the height of the first sidewall. In other embodiments, the height of first sidewall is substantially equal to the height of the second sidewall.
  • Some embodiments of the present disclosure can comprise a damper attached to the wave slot portion of the golf club head such that it does not protruding below the sole.
  • the damper can comprise, for example and not limitation, tungsten, plastic, aluminum, or steel.
  • the damper can be attached by, for example soldering, welding, gluing, clipping, or riveting.
  • Embodiments of the present invention relate generally to golf club heads, and more particularly to golf club heads having waves in a weight slot on a sole thereof.
  • the golf club head can have weight added to a bottom front region by using a weight slot.
  • the weight slot can include, for example, wave shapes in order to increase the weight of the slot without adding to the thickness of the slot wall.
  • the weight slot may include two or more wave shapes.
  • Embodiments of the present invention can comprise a wave slot with a continuous wall that alternatively extends upward and downward in a wave, or zig-zag, shape.
  • the wave can begin at the high point of a front slot sidewall, and end at the high point of a rear slot sidewall.
  • the wave shape can enable a slot thickness to be consistent to accommodate existing manufacturing techniques.
  • This wave shape can also increase the mass of the sole of the club head adjacent the ball-striking face in order to move the COG location towards the ball-striking face.
  • the invention is described herein as a wood-type golf club head.
  • One skilled in the art will recognize, however, that the invention is not so limited.
  • the materials described hereinafter as making up the various elements of the present invention are intended to be illustrative and not restrictive. Many suitable materials that would perform the same or a similar function as the materials described herein are intended to be embraced within the scope of the invention.
  • Such other materials not described herein can include, but are not limited to, materials that are developed after the time of the development of the invention.
  • a general problem with conventional golf club heads is that the use of a weight slot is limited by the ability to increase the thickness of the slot or the depth of the slot. This can be due to conventional manufacturing techniques, which restrict the thickness that can be used without manufacturing defects or limit the depth of the weight slot due to casting limitations. This limits the extent to which the COG can be moved forwards, without adding additional pieces or materials.
  • Figs. 3 and 4 illustrate an embodiment of a club head 110 according to some reference embodiments of the present disclosure.
  • the club head 110 can include a ball-striking face 112, a sole 114, and a wave slot 116.
  • the wave slot 116 can comprise a front sidewall 118, a rear sidewall 119, and one or more waves 120.
  • the wave slot 116 can be located on the sole 114 proximate the ball-striking face 112. The location of the wave slot 116 can impact the COG and COR of the club head 110, among other things.
  • the COG By locating the wave slot 116 closer to the ball-striking face 112, for example, the COG can be moved both forward (i.e., towards the ball-striking face 112) and downward (i.e., towards the sole 114).
  • the location of the COG can play a role in the spin producing characteristics of club head 110 (e.g., in reducing or increasing the spin imparted to the ball).
  • the ability to move the COG forward and downward can provide a club head with improved spin characteristics.
  • a wave slot feature 116 can enable more weight to be added to the sole 114 of the club head 110 with a given thickness. This is because a bottom surface of the rectangular groove is substantially flat, whereas the wave slot 116 is provided with one or more waves 120, and thus, a volume of a shell of the club head 110 that forms the wave slot 116 is larger than a volume of the shell that forms the rectangular groove. Since the thickness may be practically limited by the manufacturing process, a wave slot 116 arrangement enables a greater range of club head weights and COG locations (e.g., lower and farther forward) than the prior art. In some embodiments, the number of waves 120 can be varied to control the weight of the wave slot 116, and by extension the weight and COG of the club head 110.
  • wave slot 116 can also improve COR characteristics. As compared to a conventional club head, for example, the club head 110 can have an improved COR over a larger surface of the ball-striking face 112.
  • the wave slot 116 can provide an area of reduced stiffness on the ball-striking face 112 and increase the trampoline effect as the wave slot 116 "accordions" on impact. In this manner, greater power can be imparted to the ball over a larger area of the face, improved hitting consistency.
  • the result of improving the COR over a large area of the ball-striking face 112 is a larger "sweet spot," which can result in improved club head performance and require less user skill and precision to (re)produce the desired ball flight.
  • the change in COR can be controlled, for example, by modifying the number and dimensions of the wave slot 116 such as, for example and not limitation, the height of the wave 120 nearest ball striking face.
  • Each wave 120 can have a valley 121, or low point, and a peak 122.
  • the height of the first wave i.e., from the valley 121 to the peak 122 can be, for example, at or above 2.0 mm to provide a desired COR improvement and a larger sweet spot.
  • the height of each sidewall 118, 119 can also be selected to create the desired COR improvement and COG location.
  • the coefficient of restitution at a position lower (on the ground side) than the center of the ball-striking face 112 can be effectively increased as compared with the case of not having the wave slot 116.
  • the wave slot 116 may be arranged more forward (on the ball-striking face 112 side) than the center of a head width 130 of the club head 110.
  • a length 132, in a toe-heel direction, of a front side portion 116a of the wave slot 116 located closest to the ball-striking face 112 and extending along the ball-striking face 112 may be 10 mm or more, and 20 mm or more.
  • Front side portion 116a may be arranged to intersect with a sole center line 131 of the club head 110.
  • Front side portion 116a may also be arranged such that the sole center line 131 passes through the center of the front side portion 116a in the toe-heel direction.
  • Figs. 5A-5F illustrate alternative wave shapes for a club head. Each unique shape can have different COG and COR properties as well as a different overall weight. Patterns such as those illustrated may be selected to provide a club head with the properties desired for a particular user or application. Figs. 5A-5F are provided simply to illustrate examples of how the dimensions and wave sizes could be modified and are not intended to limit embodiments of the present disclosure.
  • Some embodiments and reference embodiments according to the present disclosure can comprise a club head 210, a ball-striking face 212, a sole 214, and a wave slot 216.
  • the wave slot 216 can include a front sidewall 218, a rear sidewall 219, a first wave 222, and a second wave 223.
  • Each wave 222, 223 has a valley portion 221 at the low point of each wave and a peak 229 at the high point of each wave.
  • the sidewalls 218, 219 and the waves 222, 223 of the wave slot 216 can each have a height 225, 226, 227, 228 associated with them.
  • the height 225 of the front sidewall 218 can be substantially equal to the height 226 of the rear sidewall 219.
  • the height 227 of the first wave 222 can be substantially equal to the height 228 of the second wave 223.
  • the wave slot 216 can comprise, for example, waves 222, 223 that both have a relatively small height, and are therefore lighter compared to other configurations (e.g., wave slots 316, 416, 516, 616, and 716).
  • the club head 310 is depicted with a ball-striking face 312, a sole 314, and a wave slot 316.
  • the height of the first wave 322 can be substantially equal to the height of the first wave 222, but the height of the second wave 323 may be greater than the height of the second wave 223.
  • the wave slot 316 can have a front sidewall 318 that is substantially equal in height to the rear sidewall 319. Such an arrangement may result in similar COR performance between the club heads 210 and 310, for example, but with the COG of the club head 310 being closer to the ball striking face 112.
  • the front sidewall and the rear sidewall can be substantially equal in height. In other embodiments, as shown in Figs. 5E-5F , the front sidewall and the rear sidewall can be of different heights. By altering the heights of the sidewalls, the weight of the wave slot can be located closer to, or further from the ball-striking face of the club head.
  • Embodiments and reference embodiments of the present disclosure can include wave slot designs having one, two, three, or more waves. Additionally, embodiments according to the present disclosure can include wave slot designs having sidewall heights and wave heights that vary according to the desired weight, COR value, and COG location for the particular application.
  • embodiments of the present disclosure having taller front sidewalls and front waves can have a COG location that is closer to the ball striking face, and higher from the sole than a club head designed with a shorter front sidewall and a taller second or third wave.
  • the club head has a COG nearer the ball-striking face, it can tend to impart less spin to the ball than would a club head having a COG further away from the ball-striking face.
  • the height of the club head's COG can change the location and size of the "sweet spot," which is the location on the ball-striking face that has the highest COR.
  • a shorter wave height can be between approximately 1.0 and 2.0 mm.
  • a taller wave height can be between approximately 2.0 and 4.0 mm. Shorter wave heights for the wave closest to the ball-striking face, for example, may not substantially increase the COR of the lower portion of the ball-striking face, while a taller wave can potentially have such an effect.
  • design considerations such as desired club head weight and COG location can suggest particular wave sizes and designs.
  • the club head 810 can be equipped with a damper 24 to, for example and not limitation, control the hitting sound of the club head and minimize undesirable turf interaction (e.g., snagging and digging). Unmodified, depending on the design and materials, the club head 810 may produce an undesirable sound when striking the ball. The club head 810 may also interact with the turf on which a golf ball rests. Undesirable turf interaction such as snagging, catching, gouging, or the like may result in a misaligned swing, mis-hits, and even injury. To this end, the damper 24 may be employed to reduce the magnitude of these potentially undesirable effects.
  • the damper 24 can be attached to the wave slot, and be sized so as to not protrude below the sole of club head 810.
  • the damper 24 can comprise a particularly dense and heavy material, such as tungsten, to further lower the COG of the club head.
  • the damper 24 can comprise, for example and not limitation, plastic, aluminum, or steel.
  • the damper 24 can be, for example and not limitation, soldered, welded, glued, clipped, or riveted to the sole 114.
  • a wave slot 916 formed in a sole 914 may include a plurality of bent portions 916b, 916c, 916f, and 916g in planar view.
  • the wave slot 916 may further include a front side portion 916a, first lateral portions 916d and 916e, and second lateral portions 916h and 916i connected by the aforementioned plurality of bent portions 916b, 916c, 916f, and 916g.
  • the front side portion 916a is located on the ball-striking face 912 side in planar view and extends along the ball-striking face 912.
  • the first lateral portions 916d and 916e extending in the directions intersecting with the extension direction of the front side portion 916a are connected to the front side portion 916a by the bent portions 916b and 916c located at opposing ends of the front side portion 916a, respectively.
  • the second lateral portions 916h and 916i are connected to the first lateral portions 916d and 916e by the bent portions 916f and 916g located at ends opposite to the ends connected to the front side portion 916a, respectively.
  • the second lateral portions 916h and 916i extend in the directions different from the extension directions of the first lateral portions 916d and 916e, respectively.
  • the wave slot 916 may have a planar shape bent along an outer perimeter of the club head 910. Ends 916j and 916k of the wave slot 916 may be located more rear than a center portion of the club head 910 in the front-back direction (in the horizontal direction in Fig. 7 ) of the club head 910.
  • the wave slot of the club head described above is provided with the two waves.
  • the number of the waves may be three or more.
  • the number of the waves may be three, four, or five or more.
  • a club head having a configuration shown in Figs. 8 and 9 was used as the club head of the comparative example.
  • a club head having a configuration shown in Figs. 10 and 11 (a configuration having a wave slot formed in a sole) was used as the club head of the example.
  • the club head of the comparative example and the club head of the example have a similar basic shape.
  • the wave slot 16 (see Figs. 10 and 11 ) is formed in the sole of the club head of the example, whereas a region 11, which corresponds to the position where the wave slot is formed in the aforementioned club head of the example, has a substantially flat sole surface in the club head of the comparative example.
  • a weight 12 is arranged in the aforementioned region 11 in the club head of the comparative example, as can be seen from Fig. 9 and the like.
  • the club head of the comparative example and the club head of the example have basically the same configuration, other than the region where the wave slot 16 is formed or the region where the weight 12 is arranged.
  • the following were calculated for the club head of the comparative example and the club head of the example. Specifically, the location of the center of gravity (COG), the location of the sweet spot (SS), the coefficient of restitution at a center point (a first measurement point) of the ball-striking face, and the coefficient of restitution at a second measurement point located lower than the center of the ball-striking face toward the ground side and located at a distance of 12 mm from the ground were calculated.
  • COG center of gravity
  • SS location of the sweet spot
  • SS coefficient of restitution at a center point (a first measurement point) of the ball-striking face
  • the coefficient of restitution at a second measurement point located lower than the center of the ball-striking face toward the ground side and located at a distance of 12 mm from the ground were calculated.
  • a height a from a ground 18 to the center of gravity 13 as well as a distance c from the sweet spot (SS14) to the center of gravity 13 were used as evaluation parameters.
  • a height b from the ground 18 to SS14 was used as an evaluation parameter.
  • the center point (the first measurement point 15) of the ball-striking face was defined as a center point of an assumed rectangle that was in contact with an outer perimeter of the ball-striking face in a plane including the ball-striking face.
  • the second measurement point 17 was defined as a position located at a distance of 12 mm from the ground 18 on a line segment passing through the first measurement point 15 and perpendicular to the ground 18 in the aforementioned plane including the ball-striking face. The second measurement point 17 was determined by assuming a position where the golfer actually hit the ball.
  • the height a from the ground 18 to the center of gravity 13 was 15.7 mm
  • the distance c from SS14 to the center of gravity 13 was 23.7 mm
  • the height b from the ground 18 to SS14 was 26.3 mm.
  • the coefficient of restitution (COR) at the first measurement point 15 in the club head of the example was 0.798.
  • the height a from the ground 18 to the center of gravity 13 was 15.5 mm
  • the distance c from SS 14 to the center of gravity 13 was 23.4 mm
  • the height b from the ground 18 to SS14 was 26.8 mm.
  • the coefficient of restitution (COR) at the first measurement point 15 in the club head of the comparative example was 0.799.
  • the aforementioned height a, height b, distance c and coefficient of restitution at the first measurement point 15 in the example are substantially the same as those in the comparative example.
  • a difference in coefficient of restitution at the first measurement point 15 between the example and the comparative example is small, that is, 0.001.
  • the coefficient of restitution at the second measurement point 17 in the example was 0.780
  • the coefficient of restitution at the second measurement point 17 in the comparative example was 0.770.
  • a difference in coefficient of restitution at the second measurement point 17 between the example and the comparative example is 0.010.
  • the difference in coefficient of restitution at the second measurement point 17 between the example and the comparative example is ten times as large as the difference in coefficient of restitution at the first measurement point 15 between the example and the comparative example.
  • the club head of the example is provided with the wave slot 16, and thus, the coefficient of restitution at the second measurement point 17 in the example is larger than that in the comparative example.
  • the region having a sufficient coefficient of restitution in the ball-striking face can be enlarged, while the location of the center of gravity 13 and the like are similar to those in the comparative example.
  • a height d of the wave on the ball-striking face side of the wave slot 16 shown in Fig. 11 was changed into 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, and 3.5 mm to obtain configurations (sample 1 to sample 5).
  • a height exhibiting the smaller value of the heights in the vertical direction from the valley located at the center portion of the wave to the peaks at opposing ends of the wave was used as the height d of the wave.
  • the coefficients of restitution at the first measurement point 15 and the second measurement point 17 were calculated for each club head described above.
  • the coefficient of restitution at the first measurement point 15 was 0.799 when the height d was 1.0 mm to 2.0 mm (sample 1 to sample 3), and 0.800 when the height d was 2.5 mm and 3.5 mm (sample 4 and sample 5).
  • the coefficient of restitution at the second measurement point 17 was 0.771 when the height d was 1.0 mm (sample 1), 0.773 when the height d was 1.5 mm (sample 2), 0.780 when the height d was 2.0 mm (sample 3), 0.780 when the height d was 2.5 mm (sample 4), and 0.781 when the height d was 3.5 mm (sample 5).
  • the coefficient of restitution at the second measurement point 17 can be increased to some extent.
  • the height d was defined as the height from the valley to the peak of the wave on the ball-striking face side. However, when heights to the respective peaks located on both sides of the valley in the wave are different from each other (in the case of the configurations shown in Figs. 5D to 5F , for example), height d may be defined as the smaller one of the heights from the valley to the two peaks.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
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EP15156225.3A 2014-02-25 2015-02-24 Golf club head with a wave sole Active EP2910286B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201461944119P 2014-02-25 2014-02-25
US14/311,913 US20150238826A1 (en) 2014-02-25 2014-06-23 Wave sole for a golf club head

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EP2910286A1 EP2910286A1 (en) 2015-08-26
EP2910286B1 true EP2910286B1 (en) 2017-06-14

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JP (1) JP6556462B2 (ja)

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JP2015160137A (ja) 2015-09-07
JP6556462B2 (ja) 2019-08-07
EP2910286A1 (en) 2015-08-26

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