US20100144461A1 - Golf club head - Google Patents
Golf club head Download PDFInfo
- Publication number
- US20100144461A1 US20100144461A1 US12/496,130 US49613009A US2010144461A1 US 20100144461 A1 US20100144461 A1 US 20100144461A1 US 49613009 A US49613009 A US 49613009A US 2010144461 A1 US2010144461 A1 US 2010144461A1
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- US
- United States
- Prior art keywords
- weight member
- golf club
- head
- head body
- club head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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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
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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
- A63B53/08—Golf clubs with special arrangements for obtaining a variable impact
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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
- 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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- 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
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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
Definitions
- the present invention relates to a golf club head.
- the center-of-gravity position of the golf club head changes.
- the characteristics of the golf club head change and, for example, the height or lateral directionality of flight of a hit ball, playability, ball catchability, and the like change.
- the catchability means golfer's feeling at the impact. A Golfer feels good catchability if the golfer obtains solid ball striking and easily rotates the golf club head through impact. Golfers can change the position of the weight member in accordance with their preference.
- a plurality of characteristics of the golf club head may simultaneously change. Some golfers may want to keep the ball catchability unchanged but change other characteristics of the golf club head.
- a golf club head comprising a head body, a weight member attached to the head body, and fixing means for fixing the weight member at any one of a plurality of attachment positions of the head body, wherein the plurality of attachment positions are located on a plane, and the plane includes a center-of-gravity position of the head body without the weight member attached thereto and an axis of a shaft to be attached to the golf club head.
- FIG. 1 is a perspective view of a golf club head A according to one embodiment of the present invention
- FIG. 2 is a sectional view of a sole portion 13 taken along a line X-X in FIG. 1 ;
- FIG. 6A is a sectional view of a sole portion 13 in the fourth embodiment.
- FIG. 6B is a sectional view taken along a line X-X in FIG. 6A .
- FIG. 1 is a perspective view of a golf club head A, and particularly of a sole portion 13 according to one embodiment of the present invention.
- the golf club head A includes a head body 10 and a weight member 20 .
- the head body 10 is a hollow body, and its circumferential wall constitutes a face portion 11 forming a golf ball hitting surface, a crown portion 12 forming the top surface of the golf club head A, the sole portion 13 forming the bottom surface of the golf club head A, and a side portion 14 forming the toe-side, heel-side, and back-side side surfaces of the golf club head A.
- a hosel portion 15 to which a shaft is to be attached is also provided in the head body 10 .
- the head body 10 can be assembled by joining a plurality of parts.
- the face portion 11 and the other part can be formed as different members and joined to form the head body 10 .
- the face portion 11 , sole portion 13 , and the other part can be formed as different members and joined to form the head body 10 .
- the head body 10 can be made from, for example, a metal material including a titanium metal material and stainless steel.
- the head body 10 can be made from different materials. For example, it can be formed from a metal material and a carbon fiber material. As a carbon fiber material, a carbon fiber reinforced resin (CFRP) is available.
- CFRP carbon fiber reinforced resin
- FIG. 2 is a sectional view of the sole portion 13 taken along a line X-X in FIG. 1 .
- Each of the attachment portions 131 a to 131 d forms a tube having a female screw hole SC 1 .
- the weight member 20 has an axial male screw portion SC 2 .
- the weight member 20 can be fixed to the head body 10 by threadably engaging the female screw hole SC 1 and male screw portion SC 2 to each other.
- a washer 30 is a resin member inserted between the weight member 20 and the sole portion 13 .
- the washer 30 serves to prevent loose threadable engagement between the female screw hole SC 1 and male screw portion SC 2 , thereby preventing the weight member 20 fixed once from falling easily.
- the washer 30 may be integrally provided in the weight member 20 .
- the washer 30 may be fixed to the weight member 20 in advance.
- the surface of the weight member 20 may be covered with a resin material.
- the female screw holes SC 1 to which the weight member 20 is not attached can be closed by attaching caps 40 .
- the cap 40 is made from, for example, a resin material, and detachably fitted in the female screw hole SC 1 .
- the female screw holes SC 1 may be closed at their upper ends.
- the cap 40 is formed to have the same shape as the weight member 20 .
- the material of the cap 40 is selected such that its weight substantially gives no influence on a change in center-of-gravity position.
- the cap 40 may be formed to screw in the female screw hole SC 1 .
- the weight member 20 can be made from, for example, a metal material.
- a metal material for example, tungsten, a tungsten alloy, aluminum, an aluminum alloy, magnesium, and a magnesium alloy are available.
- the weight member 20 may be made by, for example, mixing a metal powder with a viscoelastic material. In this case, the vibration dampening effect of the golf club head A at impact can improve.
- a viscoelastic material for example, NBR (acrylonitrile-butadiene rubber) is available.
- FIG. 3 is a view for explaining a center-of-gravity angle ⁇ , which shows the golf club head A seen from the sole portion 13 side while the shaft of the golf club using the golf club head A is kept rotatable about the axis of the shaft and horizontally supported
- a center-of-gravity angle ⁇ which shows the golf club head A seen from the sole portion 13 side while the shaft of the golf club using the golf club head A is kept rotatable about the axis of the shaft and horizontally supported
- an arrow Dh represents the horizontal direction
- an arrow Dv represents the vertical direction.
- a center-of-gravity position CG represents the center-of-gravity position of the head body 10 without the weight member 20 attached thereto.
- a plane S is a virtual plane that includes the center-of-gravity position CG of the head body 10 and an axis L 1 of a shaft (not shown) to be mounted to the golf club head A. Since the shaft is mounted to the hosel portion 15 , the axis L 1 is substantially the same as the axis of the hosel portion 15 .
- the attachment portions 131 a to 131 d are located on the plane S, and particularly on a straight line L 0 included in the plane S in this embodiment.
- the center-of-gravity depth is the length of a perpendicular from the center-of-gravity position of the golf club head to the face portion.
- the face portion 11 forms not a flat surface but an arcuate surface, a virtual plane touching the face center is used as the reference.
- the center-of-gravity position of the golf club head A moves toward the heel side from the center-of-gravity position CG of the head body 10 . Accordingly, the center-of-gravity length of the golf club head A becomes relatively short, and the playability of the golf club head A improves.
- the center-of-gravity position of the golf club head A is located relatively on the heel side, it becomes relatively easy to hook a ball.
- the center-of-gravity angle hardly changes, as described below, it can be avoided to excessively catch the ball. Therefore, when the weight member 20 is attached to the attachment portion 131 a, a club that is good in playability and easily produces a draw ball flight can be obtained.
- the center-of-gravity position of the golf club head A moves toward the toe side from the center-of-gravity position CG of the head body 10 . Accordingly, the center-of-gravity length of the golf club head A becomes relatively long and, in regard of the playability of the golf club head A, the golfer easily feels the weight of the head and the movement of golfer's fingers rarely influences the behavior of the golf club head A.
- the center-of-gravity position of the golf club head A is located relatively on the toe side, it becomes relatively easy to slice a ball.
- the center-of-gravity angle hardly changes, as described below, it can be avoided to excessively deteriorate ball catchability. Therefore, when the weight member 20 is attached to the attachment portion 131 d, the golf club head A becomes to show a behavior insensitive to golfer's operation, and a club that easily produces a fade ball flight independent of golfer's skill can be obtained.
- the center-of-gravity angle ⁇ is an angle formed by the face portion 11 and the vertical plane (plane S in FIG. 1 ) that passes the axis L 1 .
- the center-of-gravity angle ⁇ mainly influences ball catchability at impact. When the center-of-gravity angle ⁇ is larger, a ball is caught relatively more easily. When the center-of-gravity angle ⁇ is smaller, a ball is caught relatively less easily.
- a change in ball catchability at impact can be suppressed as much as possible but other characteristics of the golf club head A can be changed by changing the attachment position of the weight member 20 .
- the one weight member 20 is used in this embodiment, one of a plurality of the weight members 20 having different weights may be selectively fixed to the head body 10 . With this arrangement, it becomes possible to widen the selection range of center-of-gravity position and center-of-gravity depth of the golf club head A and to increase their choices as well. In this case, the two or more weight members 20 may simultaneously be fixed to the head body 10 .
- the change amount of center-of-gravity depth of the golf club head A caused by the difference between the attachment portions 131 a to 131 d used to fix the weight member 20 for example, the difference in center-of-gravity depth between a case in which the weight member 20 is attached to the attachment portion 131 a and a case in which the weight member 20 is attached to the attachment portion 131 d, is preferably 3 mm or more.
- the difference in center-of-gravity depth is 3 mm or more, a golfer can more clearly feel the change in characteristics of the golf club head caused by the change in center-of-gravity position.
- FIG. 4 is a sectional view showing another arrangement example of attachment portions 131 a to 131 d, which corresponds to the sectional view of a sole portion 13 taken along the line X-X in FIG. 1 .
- the same components as in the golf club head A of the above-described first embodiment are denoted by the same reference numerals below, and a description thereof will not be repeated. Only components different from those of the golf club head A will be described.
- recesses 132 a to 132 d to accommodate a weight member 20 are provided in the attachment portions 131 a to 131 d, respectively.
- the depth of each of the recesses 132 a to 132 d is set such that the lowest portion of the weight member 20 fixed to a head body 10 is positioned above the lowest portion of the sole portion 13 .
- the weight member 20 does not project from the sole portion 13 . Accordingly, it is possible to prevent the weight member 20 from catching the ground upon hitting a ball.
- FIG. 5 is a sectional view showing another arrangement example of attachment portions 131 a to 131 d and weight member 20 , which corresponds to the sectional view of a sole portion 13 taken along the line X-X in FIG. 1 .
- the same components as in the golf club head A of the above-described first embodiment are denoted by the same reference numerals below, and a description thereof will not be repeated. Only components different from those of the golf club head A will be described.
- axial male screw portions SC 3 are provided in the respective attachment portions 131 a to 131 d, and a female screw hole SC 4 which threadably engages with the male screw portion SC 3 is provided in a weight member 20 .
- Each of the attachment portions 131 a to 131 d has an internal space to accommodate the weight member 20 , thereby preventing the weight member 20 from projecting from the sole portion 13 , as in the above-described second embodiment.
- the screw portion on the sole portion 13 side and that on the weight member 20 side are a male screw and female screw, respectively, and vice versa.
- the weight member 20 can be fixed at a plurality of positions spaced apart from each other.
- a weight member 20 may be fixable at a given position on a straight line included in a plane S. With this arrangement, it is possible to more finely adjust the center-of-gravity position and center-of-gravity depth of the golf club head.
- FIG. 6A is a sectional view of a sole portion 13 in the fourth embodiment, and corresponds to the sectional view of the sole portion 13 taken along the line X-X in FIG. 1 .
- FIG. 6B is a sectional view taken along a line X-X in FIG. 6A , and shows a state in which the weight member 20 is detached.
- the same components as in the golf club head A of the above-described first embodiment are denoted by the same reference numerals below, and a description thereof will not be repeated. Only components different from those of the golf club head A will be described.
- a rail portion 50 extending along a straight line L 0 (see FIG. 1 ) included in the plane S is formed in the sole portion 13 . As described below, the rail portion 50 guides the movement of the weight member 20 .
- the rail portion 50 includes a groove 51 formed by recessing the sole portion 13 and open at its lower part, and a partitioned chamber 52 formed in the upper portion of the groove 51 . Both the groove 51 and partitioned chamber 52 are formed along the above-described straight line L 0 .
- the groove 51 has a pair of side walls 13 a and a pair of partitioning portions 13 b formed by bending the side walls 13 a.
- the partitioning portions 13 b are located between the groove 51 and partitioned chamber 52 , thereby vertically partitioning them.
- the pair of the partitioning portions 13 b are spaced apart from each other to form a slit 53 .
- the groove 51 accommodates the weight member 20 .
- the depth of the groove 51 is set such that the lowest portion of the weight member 20 fixed to the head body 10 is positioned above the lowest portion of the sole portion 13 . With this arrangement, the weight member 20 does not project from the sole portion 13 , and therefore it is possible to prevent the weight member 20 from catching the ground upon hitting a ball.
- the partitioned chamber 52 is formed by joining the lower ends of a lid member 54 having a U-shaped cross section to the partitioning portions 13 b. The upper part of the partitioned chamber 52 is closed by the lid member 54 .
- the partitioned chamber 52 accommodates a slide member 55 .
- the slide member 55 is sized such that it cannot rotate in the partitioned chamber 52 and, for example, has a square shape when viewed from the above.
- An axial male screw portion SC 5 that passes the slit 53 is integrally connected to the slide member 55 .
- a female screw hole SC 6 which threadably engages with the male screw portion SC 5 is formed in the weight member 20 .
- the width of the weight member 20 is larger than that of the slit 53 in the widthwise direction.
- the end portion of the rail portion 50 on the heel side is closed by a wall portion 16 , which is formed by bending a part of the head body 10 , and a part of the lid member 54 .
- the toe-side end portion of the rail portion 50 is open, and a closing member 141 is mounted thereto to close it.
- the closing member 141 is secured to the head body 10 to close the toe-side end portion.
- the closing member 141 may be made from an elastic body such as rubber so that it is detachable from the head body 10 . In this case, it becomes possible to exchange the slide member 55 .
- the threadable engagement between the male screw portion SC 5 and female screw hole SC 6 is loosened, and the slide member 55 and the weight member 20 are moved. Since these members are guided by the rail portion 50 during movement, their positions can be easily changed.
- the weight member 20 can be fixed.
- the weight member 20 can be fixed at a given position on the straight line L 0 , and therefore it is possible to more finely adjust the center-of-gravity position and center-of-gravity depth of the golf club head.
- the center-of-gravity position of the head body 10 is defined as a center-of-gravity position CG of the head body 10 without the weight member 20 and slide member 55 .
- the weight member 20 can be completely detached from the slide member 55 , one of a plurality of the weight members 20 having different weights may be selectively fixed to the head body 10 .
- the structure of the rail portion 50 is not limited to that shown in FIGS. 6A and 6B , but any structure can be used as long as the weight member 20 can be moved and fixed at a given position.
Abstract
A golf club head of this invention includes a head body, a weight member attached to the head body, and a fixing unit to fix the weight member at one of a plurality of attachment positions of the head body. The plurality of attachment positions are located on a plane. The plane includes the center-of-gravity position of the head body without the weight member attached thereto and the axis of a shaft to be attached to the golf club head.
Description
- 1. Field of the Invention
- The present invention relates to a golf club head.
- 2. Description of the Related Art
- There have been proposed golf club heads in which golfers can change the position of a weight member attached to the golf club head in accordance with their preference. Japanese Patent Laid-Open Nos. 2001-137400, 2006-102235, and 2007-222257 disclose putter heads in which the position of the weight member can be changed. Japanese Utility Model Laid-Open No. 7-15067, Japanese Patent Laid-Open No. 11-9742, and Japanese Utility Model Registration No. 3127234 disclose wood type golf club heads in which the position of the weight member can be changed.
- When the position of the weight member is changed, the center-of-gravity position of the golf club head changes. When the center-of-gravity position changes, the characteristics of the golf club head change and, for example, the height or lateral directionality of flight of a hit ball, playability, ball catchability, and the like change. The catchability means golfer's feeling at the impact. A Golfer feels good catchability if the golfer obtains solid ball striking and easily rotates the golf club head through impact. Golfers can change the position of the weight member in accordance with their preference.
- When the position of the weight member is changed, however, a plurality of characteristics of the golf club head may simultaneously change. Some golfers may want to keep the ball catchability unchanged but change other characteristics of the golf club head.
- It is an object of the present invention to provide a golf club head in which the position of a weight member can be changed, a change in ball catchability is suppressed as much as possible but the other characteristics of the golf club head can be changed by changing the position of the weight member.
- According to the present invention, there is provided a golf club head comprising a head body, a weight member attached to the head body, and fixing means for fixing the weight member at any one of a plurality of attachment positions of the head body, wherein the plurality of attachment positions are located on a plane, and the plane includes a center-of-gravity position of the head body without the weight member attached thereto and an axis of a shaft to be attached to the golf club head.
- Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.
-
FIG. 1 is a perspective view of a golf club head A according to one embodiment of the present invention; -
FIG. 2 is a sectional view of asole portion 13 taken along a line X-X inFIG. 1 ; -
FIG. 3 is a view for explaining a center-of-gravity angle θ; -
FIG. 4 is a sectional view showing the arrangement ofattachment portions 131 a to 131 d according to the second embodiment of the present invention; -
FIG. 5 is a sectional view showing the arrangement ofattachment portions 131 a to 131 d and aweight member 20 according to the third embodiment of the present invention; -
FIG. 6A is a sectional view of asole portion 13 in the fourth embodiment; and -
FIG. 6B is a sectional view taken along a line X-X inFIG. 6A . - Preferred embodiments of the present invention will now be described in detail in accordance with the accompanying drawings.
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FIG. 1 is a perspective view of a golf club head A, and particularly of asole portion 13 according to one embodiment of the present invention. - The golf club head A includes a
head body 10 and aweight member 20. Thehead body 10 is a hollow body, and its circumferential wall constitutes aface portion 11 forming a golf ball hitting surface, acrown portion 12 forming the top surface of the golf club head A, thesole portion 13 forming the bottom surface of the golf club head A, and aside portion 14 forming the toe-side, heel-side, and back-side side surfaces of the golf club head A. Ahosel portion 15 to which a shaft is to be attached is also provided in thehead body 10. - Although the golf club head A is a golf club head for a driver, the present invention is applicable to wood type golf club heads including a fairway wood and the like other than a driver, utility type (hybrid type) golf club heads, and other hollow golf club heads. The
head body 10 is a hollow body in this embodiment, but it may be solid. - The
head body 10 can be assembled by joining a plurality of parts. For example, theface portion 11 and the other part can be formed as different members and joined to form thehead body 10. Also, theface portion 11,sole portion 13, and the other part can be formed as different members and joined to form thehead body 10. Thehead body 10 can be made from, for example, a metal material including a titanium metal material and stainless steel. Thehead body 10 can be made from different materials. For example, it can be formed from a metal material and a carbon fiber material. As a carbon fiber material, a carbon fiber reinforced resin (CFRP) is available. - A plurality of
attachment portions 131 a to 131 d, which define the attachment positions of theweight member 20, are formed in thesole portion 13. Although fourattachment portions 131 a to 131 d are provided in this embodiment, the number of the attachment portions is not limited to four. The user of the golf club head A can attach theweight member 20 to any one of theattachment portions 131 a to 131 d.FIG. 2 is a sectional view of thesole portion 13 taken along a line X-X inFIG. 1 . - Each of the
attachment portions 131 a to 131 d forms a tube having a female screw hole SC1. Theweight member 20 has an axial male screw portion SC2. Theweight member 20 can be fixed to thehead body 10 by threadably engaging the female screw hole SC1 and male screw portion SC2 to each other. - A
washer 30 is a resin member inserted between theweight member 20 and thesole portion 13. Thewasher 30 serves to prevent loose threadable engagement between the female screw hole SC1 and male screw portion SC2, thereby preventing theweight member 20 fixed once from falling easily. Thewasher 30 may be integrally provided in theweight member 20. For example, thewasher 30 may be fixed to theweight member 20 in advance. Also, the surface of theweight member 20 may be covered with a resin material. - As shown in
FIG. 2 , of theattachment portions 131 a to 131 d, the female screw holes SC1 to which theweight member 20 is not attached can be closed by attachingcaps 40. With this arrangement, it is possible to prevent dust and the like from entering thehead body 10 through the female screw holes SC1. Thecap 40 is made from, for example, a resin material, and detachably fitted in the female screw hole SC1. In order to prevent dust and the like from entering thehead body 10 through the female screw holes SC1, instead of using thecaps 40, the female screw holes SC1 may be closed at their upper ends. - The
cap 40 is formed to have the same shape as theweight member 20. The material of thecap 40 is selected such that its weight substantially gives no influence on a change in center-of-gravity position. Thecap 40 may be formed to screw in the female screw hole SC1. - The
weight member 20 can be made from, for example, a metal material. As such a metal material, for example, tungsten, a tungsten alloy, aluminum, an aluminum alloy, magnesium, and a magnesium alloy are available. Theweight member 20 may be made by, for example, mixing a metal powder with a viscoelastic material. In this case, the vibration dampening effect of the golf club head A at impact can improve. As such a viscoelastic material, for example, NBR (acrylonitrile-butadiene rubber) is available. - The positions of the
attachment portions 131 a to 131 d will be described with reference toFIGS. 1 and 3 . -
FIG. 3 is a view for explaining a center-of-gravity angle θ, which shows the golf club head A seen from thesole portion 13 side while the shaft of the golf club using the golf club head A is kept rotatable about the axis of the shaft and horizontally supported InFIG. 3 , an arrow Dh represents the horizontal direction and an arrow Dv represents the vertical direction. - In
FIGS. 1 and 3 , a center-of-gravity position CG represents the center-of-gravity position of thehead body 10 without theweight member 20 attached thereto. A plane S is a virtual plane that includes the center-of-gravity position CG of thehead body 10 and an axis L1 of a shaft (not shown) to be mounted to the golf club head A. Since the shaft is mounted to thehosel portion 15, the axis L1 is substantially the same as the axis of thehosel portion 15. Theattachment portions 131 a to 131 d are located on the plane S, and particularly on a straight line L0 included in the plane S in this embodiment. - The effect obtained by arranging the
attachment portions 131 a to 131 d on the plane S will be described next. When theweight member 20 is fixed to any one of theattachment portions 131 a to 131 d, the center-of-gravity position and center-of-gravity depth of the golf club head A change accordingly. In this embodiment, the center-of-gravity depth is the length of a perpendicular from the center-of-gravity position of the golf club head to the face portion. When theface portion 11 forms not a flat surface but an arcuate surface, a virtual plane touching the face center is used as the reference. - For example, when the
weight member 20 is attached to theattachment portion 131 a, the center-of-gravity position of the golf club head A moves toward the heel side from the center-of-gravity position CG of thehead body 10. Accordingly, the center-of-gravity length of the golf club head A becomes relatively short, and the playability of the golf club head A improves. When the center-of-gravity position of the golf club head A is located relatively on the heel side, it becomes relatively easy to hook a ball. However, since the center-of-gravity angle hardly changes, as described below, it can be avoided to excessively catch the ball. Therefore, when theweight member 20 is attached to theattachment portion 131 a, a club that is good in playability and easily produces a draw ball flight can be obtained. - When the
weight member 20 is attached to theattachment portion 131 d, the center-of-gravity position of the golf club head A moves toward the toe side from the center-of-gravity position CG of thehead body 10. Accordingly, the center-of-gravity length of the golf club head A becomes relatively long and, in regard of the playability of the golf club head A, the golfer easily feels the weight of the head and the movement of golfer's fingers rarely influences the behavior of the golf club head A. In addition, when the center-of-gravity position of the golf club head A is located relatively on the toe side, it becomes relatively easy to slice a ball. However, since the center-of-gravity angle hardly changes, as described below, it can be avoided to excessively deteriorate ball catchability. Therefore, when theweight member 20 is attached to theattachment portion 131 d, the golf club head A becomes to show a behavior insensitive to golfer's operation, and a club that easily produces a fade ball flight independent of golfer's skill can be obtained. - As described above, in this embodiment, the characteristics of the golf club head A can be changed by selecting the
attachment portions 131 a to 131 d used to fix theweight member 20. - Since the
attachment portions 131 a to 131 d are located on the plane S, the center-of-gravity angle θ hardly changes regardless of theattachment portions 131 a to 131 d used to attach theweight member 20, as will be understood fromFIG. 2 . The center-of-gravity angle θ is an angle formed by theface portion 11 and the vertical plane (plane S inFIG. 1 ) that passes the axis L1. The center-of-gravity angle θ mainly influences ball catchability at impact. When the center-of-gravity angle θ is larger, a ball is caught relatively more easily. When the center-of-gravity angle θ is smaller, a ball is caught relatively less easily. - As described above, in this embodiment, a change in ball catchability at impact can be suppressed as much as possible but other characteristics of the golf club head A can be changed by changing the attachment position of the
weight member 20. - Although the one
weight member 20 is used in this embodiment, one of a plurality of theweight members 20 having different weights may be selectively fixed to thehead body 10. With this arrangement, it becomes possible to widen the selection range of center-of-gravity position and center-of-gravity depth of the golf club head A and to increase their choices as well. In this case, the two ormore weight members 20 may simultaneously be fixed to thehead body 10. - The change amount of center-of-gravity depth of the golf club head A caused by the difference between the
attachment portions 131 a to 131 d used to fix theweight member 20, for example, the difference in center-of-gravity depth between a case in which theweight member 20 is attached to theattachment portion 131 a and a case in which theweight member 20 is attached to theattachment portion 131 d, is preferably 3 mm or more. When the difference in center-of-gravity depth is 3 mm or more, a golfer can more clearly feel the change in characteristics of the golf club head caused by the change in center-of-gravity position. -
FIG. 4 is a sectional view showing another arrangement example ofattachment portions 131 a to 131 d, which corresponds to the sectional view of asole portion 13 taken along the line X-X inFIG. 1 . The same components as in the golf club head A of the above-described first embodiment are denoted by the same reference numerals below, and a description thereof will not be repeated. Only components different from those of the golf club head A will be described. - In this embodiment, recesses 132 a to 132 d to accommodate a
weight member 20 are provided in theattachment portions 131 a to 131 d, respectively. The depth of each of therecesses 132 a to 132 d is set such that the lowest portion of theweight member 20 fixed to ahead body 10 is positioned above the lowest portion of thesole portion 13. - With this arrangement, as shown in
FIG. 4 , theweight member 20 does not project from thesole portion 13. Accordingly, it is possible to prevent theweight member 20 from catching the ground upon hitting a ball. -
FIG. 5 is a sectional view showing another arrangement example ofattachment portions 131 a to 131 d andweight member 20, which corresponds to the sectional view of asole portion 13 taken along the line X-X inFIG. 1 . The same components as in the golf club head A of the above-described first embodiment are denoted by the same reference numerals below, and a description thereof will not be repeated. Only components different from those of the golf club head A will be described. - In this embodiment, axial male screw portions SC3 are provided in the
respective attachment portions 131 a to 131 d, and a female screw hole SC4 which threadably engages with the male screw portion SC3 is provided in aweight member 20. Each of theattachment portions 131 a to 131 d has an internal space to accommodate theweight member 20, thereby preventing theweight member 20 from projecting from thesole portion 13, as in the above-described second embodiment. - In this manner, the screw portion on the
sole portion 13 side and that on theweight member 20 side are a male screw and female screw, respectively, and vice versa. - In the above-described first to third embodiments, the
weight member 20 can be fixed at a plurality of positions spaced apart from each other. However, aweight member 20 may be fixable at a given position on a straight line included in a plane S. With this arrangement, it is possible to more finely adjust the center-of-gravity position and center-of-gravity depth of the golf club head. -
FIG. 6A is a sectional view of asole portion 13 in the fourth embodiment, and corresponds to the sectional view of thesole portion 13 taken along the line X-X inFIG. 1 .FIG. 6B is a sectional view taken along a line X-X inFIG. 6A , and shows a state in which theweight member 20 is detached. The same components as in the golf club head A of the above-described first embodiment are denoted by the same reference numerals below, and a description thereof will not be repeated. Only components different from those of the golf club head A will be described. - A
rail portion 50 extending along a straight line L0 (seeFIG. 1 ) included in the plane S is formed in thesole portion 13. As described below, therail portion 50 guides the movement of theweight member 20. Therail portion 50 includes agroove 51 formed by recessing thesole portion 13 and open at its lower part, and apartitioned chamber 52 formed in the upper portion of thegroove 51. Both thegroove 51 and partitionedchamber 52 are formed along the above-described straight line L0. - The
groove 51 has a pair ofside walls 13 a and a pair ofpartitioning portions 13 b formed by bending theside walls 13 a. Thepartitioning portions 13 b are located between thegroove 51 and partitionedchamber 52, thereby vertically partitioning them. The pair of thepartitioning portions 13 b are spaced apart from each other to form aslit 53. Thegroove 51 accommodates theweight member 20. The depth of thegroove 51 is set such that the lowest portion of theweight member 20 fixed to thehead body 10 is positioned above the lowest portion of thesole portion 13. With this arrangement, theweight member 20 does not project from thesole portion 13, and therefore it is possible to prevent theweight member 20 from catching the ground upon hitting a ball. - The partitioned
chamber 52 is formed by joining the lower ends of alid member 54 having a U-shaped cross section to thepartitioning portions 13 b. The upper part of the partitionedchamber 52 is closed by thelid member 54. - The partitioned
chamber 52 accommodates aslide member 55. Theslide member 55 is sized such that it cannot rotate in the partitionedchamber 52 and, for example, has a square shape when viewed from the above. An axial male screw portion SC5 that passes theslit 53 is integrally connected to theslide member 55. A female screw hole SC6 which threadably engages with the male screw portion SC5 is formed in theweight member 20. The width of theweight member 20 is larger than that of theslit 53 in the widthwise direction. - The end portion of the
rail portion 50 on the heel side is closed by awall portion 16, which is formed by bending a part of thehead body 10, and a part of thelid member 54. The toe-side end portion of therail portion 50 is open, and a closingmember 141 is mounted thereto to close it. Upon assembling thehead body 10, after theslide member 55 is inserted into the partitionedchamber 52 from the toe-side end portion of therail portion 50, the closingmember 141 is secured to thehead body 10 to close the toe-side end portion. For example, the closingmember 141 may be made from an elastic body such as rubber so that it is detachable from thehead body 10. In this case, it becomes possible to exchange theslide member 55. - In this embodiment with the above-described components, when the male screw portion SC5 threadably engages with the female screw hole SC6, the
slide member 55 andweight member 20 sandwich thepartitioning portions 13 b, thereby fixing theweight member 20 to thehead body 10. Awasher 30 inserted between the partitioningportions 13 b andweight member 20 prevents the loose threadable engagement between the male screw portion SC5 and female screw hole SC6. - When changing the position of the
weight member 20, the threadable engagement between the male screw portion SC5 and female screw hole SC6 is loosened, and theslide member 55 and theweight member 20 are moved. Since these members are guided by therail portion 50 during movement, their positions can be easily changed. By threadably engaging the male screw portion SC5 with the female screw hole SC6 at a desired position, theweight member 20 can be fixed. - As described above, in this embodiment, the
weight member 20 can be fixed at a given position on the straight line L0, and therefore it is possible to more finely adjust the center-of-gravity position and center-of-gravity depth of the golf club head. Note that in this embodiment, the center-of-gravity position of thehead body 10 is defined as a center-of-gravity position CG of thehead body 10 without theweight member 20 andslide member 55. Also, in this embodiment, since theweight member 20 can be completely detached from theslide member 55, one of a plurality of theweight members 20 having different weights may be selectively fixed to thehead body 10. - In this embodiment, since the
rail portion 50 is enclosed by the closingmember 141,wall portion 16, andlid member 54, it is possible to prevent dust and the like from entering thehead body 10 through therail portion 50. - Note that the structure of the
rail portion 50 is not limited to that shown inFIGS. 6A and 6B , but any structure can be used as long as theweight member 20 can be moved and fixed at a given position. - While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
- This application claims the benefit of Japanese Patent Application No. 2008-313695, filed Dec. 9, 2008, which is hereby incorporated by reference herein in its entirety.
Claims (9)
1. A golf club head comprising:
a head body;
a weight member attached to said head body; and
fixing means for fixing said weight member at any one of a plurality of attachment positions of said head body,
wherein the plurality of attachment positions are located on a plane, and
the plane includes a center-of-gravity position of said head body without said weight member attached thereto and an axis of a shaft to be attached to the golf club head.
2. The head according to claim 1 , wherein said fixing means comprises:
a plurality of first screw portions which are provided in a sole portion of said head body and define the plurality of attachment positions; and
a second screw portion which is provided in said weight member and threadably engages with one of said plurality of first screw portions.
3. The head according to claim 1 , further comprising a rail portion which is formed along a straight line included in the plane in said sole portion of said body and defines the plurality of attachment positions,
wherein said fixing means fixes said weight member at a given position on said rail portion.
4. The head according to claim 3 , wherein said rail portion comprises:
a groove open at a lower part thereof, which is formed along the straight line and forms an accommodation space to accommodate said weight member;
a partitioned chamber closed at an upper part thereof, which is formed along the straight line in an upper portion of said groove;
a partitioning portion which is provided between said groove and said partitioned chamber and vertically partitions the space into said groove and said partitioned chamber; and
a slit which is formed along the straight line in said partitioned chamber and makes the space in said groove communicate with said partitioned chamber, and
said fixing means comprises:
a slide member which is accommodated in said partitioned chamber such that said slide member can move along the straight line, and connected to said weight member through said slit; and
screw portions which are respectively provided in said slide member and said weight member, and threadably engage with each other.
5. The head according to claim 1 , wherein a change amount of center-of-gravity depth of the golf club head caused by a difference between the attachment positions used to fix said weight member is not less than 3 mm.
6. The head according to claim 1 , wherein said weight member comprises a plurality of weight members having different weights.
7. The head according to claim 1 , further comprising a resin member which is inserted between said head body and said weight member at the attachment position.
8. The head according to claim 7 , wherein said resin member is integrally provided in said weight member.
9. The head according to claim 1 , wherein said weight member is fixed to said sole portion of said head body,
said sole portion includes a recess formed in the attachment position of said weight member, and
a depth of said recess is set such that a lowest portion of said weight member fixed to said head body is positioned above a lowest portion of said sole portion.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008313695A JP5221310B2 (en) | 2008-12-09 | 2008-12-09 | Golf club head |
JP2008-313695 | 2008-12-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100144461A1 true US20100144461A1 (en) | 2010-06-10 |
Family
ID=42231716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/496,130 Abandoned US20100144461A1 (en) | 2008-12-09 | 2009-07-01 | Golf club head |
Country Status (2)
Country | Link |
---|---|
US (1) | US20100144461A1 (en) |
JP (1) | JP5221310B2 (en) |
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JP5221310B2 (en) | 2013-06-26 |
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