US20130324289A1 - Golf club steel shaft - Google Patents

Golf club steel shaft Download PDF

Info

Publication number
US20130324289A1
US20130324289A1 US13/905,311 US201313905311A US2013324289A1 US 20130324289 A1 US20130324289 A1 US 20130324289A1 US 201313905311 A US201313905311 A US 201313905311A US 2013324289 A1 US2013324289 A1 US 2013324289A1
Authority
US
United States
Prior art keywords
shaft
golf club
weight
head
ball
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
Application number
US13/905,311
Other languages
English (en)
Inventor
Kiyofumi Matsunaga
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.)
Dunlop Sports Co Ltd
Original Assignee
Dunlop Sports Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dunlop Sports Co Ltd filed Critical Dunlop Sports Co Ltd
Assigned to DUNLOP SPORTS CO. LTD. reassignment DUNLOP SPORTS CO. LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MATSUNAGA, KIYOFUMI
Publication of US20130324289A1 publication Critical patent/US20130324289A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • 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
    • A63B53/12—Metallic shafts
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/42—Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00—Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/02—Testing, calibrating or measuring of equipment

Definitions

  • the present invention relates to a steel shaft.
  • flight distance of a ball is one of the important factors when selecting a golf club. Therefore, hitherto, in order to extend the flight distance of the ball, various improvements have been made with regard to shapes and materials of elements forming a golf club.
  • the present invention has been made in view of such circumstances, and an objective of the present invention is to provide a golf club steel shaft that makes it possible to extend flight distance of a ball while maintaining feel of hitting a ball and directivity of a hit ball.
  • the center-of-gravity rate Y (%), the shaft weight X (g), and the full length of the shaft L S (inch) are each set as values within the above described ranges, it is possible to increase weight of a golf club head with steel iron, and extend flight distance of a ball while maintaining feel of hitting a ball and directivity of a hit ball.
  • a thickness of a portion up to 150 mm from a butt end toward a front end side of the shaft is preferably not smaller than 0.30 mm but not larger than 0.40 mm.
  • an outer diameter of a portion up to 150 mm from a butt end toward a front end side of the shaft is preferably not smaller than 14.5 mm but not larger than 15.3 mm.
  • the number of steps included in a portion up to 400 mm from a butt end toward a front end side of the shaft is preferably not less than 5 but not more than 8.
  • FIG. 1 is an illustrative diagram of a golf club including one embodiment of a golf club steel shaft of the present invention.
  • FIG. 2 is for describing a method for measuring T-point strength.
  • FIG. 1 is an illustrative diagram showing the entirety of a golf club 1 including a steel shaft (hereinafter, may be simply referred to as “shaft”) for a golf club, according to one embodiment of the present invention.
  • the golf club 1 includes an iron type golf club head 2 having a predetermined loft angle, a shaft 3 , and a grip 4 .
  • the head 2 has a hosel 6 including a shaft hole 5 to which a tip end 3 a on the front end side of the shaft 3 is inserted and fixed.
  • a butt end 3 b at the back end side of the shaft 3 is inserted and fixed in a grip hole 7 of the grip 4 .
  • the tip end 3 a is positioned inside the head 2
  • the butt end 3 b is positioned inside the grip 4 .
  • a reference character of “G” indicates the center of gravity (center of gravity point) of the shaft 3 .
  • the center of gravity G is located on a shaft axis inside the shaft 3 .
  • the weight of the golf club 1 is not particularly limited in the present invention, it is preferably set within a range of not smaller than 360 g. If the weight of the golf club 1 is too small, the strengths of respective elements (parts) forming the golf club 1 become low, and durability of the golf club 1 may deteriorate. Therefore, the weight of the golf club 1 is preferably not smaller than 370 g, and further preferably not smaller than 380 g. On the other hand, if the weight of the golf club 1 is too large, it becomes difficult to perform a swing, and it becomes difficult to increase head speed. Therefore, the weight of the golf club 1 is further preferably not larger than 500 g, and particularly preferably not larger than 490 g.
  • the length of the golf club 1 itself is also not particularly limited in the present invention, and is ordinarily from 34.0 to 42.0 inches. If the length of the golf club 1 is too small, although a swing can be performed easily, a turning radius of the swing becomes small, and it becomes difficult to obtain a sufficient head speed. As a result, the ball speed cannot be increased, and the flight distance of the ball cannot be extended. Therefore, the length of the golf club 1 is preferably not smaller than 34.5 inches, and further preferably not smaller than 35.0 inches. On the other hand, if the length of the golf club 1 is too large, the head speed decreases since it becomes difficult to swing the club. Therefore, the ball speed cannot be increased, and the flight distance of the ball cannot be extended. Therefore, the length of the golf club 1 is preferably not larger than 41.5 inches, and further preferably not larger than 41.0 inches.
  • club length is a length measured based on the description in “Appendix II—Design of Clubs” “1. Clubs” “1c. Length” in the Rules of Golf determined by R&A (The Royal and Ancient Golf Club of Saint Andrews).
  • the head 2 in the present embodiment is a solid iron head and has a large inertia moment. With a club having the head 2 with a large inertia moment, an advantageous effect of improvement in flight distance can be stably obtained.
  • the material of the head 2 there is no particular limitation in the material of the head 2 , and, for example, titanium, titanium alloys, stainless steel, maraging steel, soft iron, and the like can be used. Furthermore, instead of manufacturing the head 2 using a single material, the head 2 may be manufactured by combining multiple materials as appropriate.
  • the weight of the head 2 itself is not particularly limited, it is preferably within a range from 230 to 310 g. If the head 2 is too light, the kinetic energy of the head 2 cannot be sufficiently provided to the ball, and it becomes difficult to increase the ball speed. Therefore, the weight of the head 2 is further preferably not smaller than 235 g, and particularly preferably not smaller than 240 g. On the other hand, if the weight of the head 2 is too large, the golf club 1 becomes heavy and difficult to swing. Therefore, the weight of the head 2 is further preferably not larger than 305 g, and particularly preferably not larger than 300 g.
  • the ratio (head weight/club weight) of the head weight and the club weight is set to be not lower than 0.55 but not higher than 0.70. If this ratio is too small, the kinetic energy of the head 2 becomes small and obtaining a sufficient ball speed becomes difficult. Therefore, the ratio is preferably not lower than 0.56, and further preferably not lower than 0.57. On the other hand, if the ratio is too large, the head 2 becomes heavy and it becomes difficult to swing the club. Therefore, the ratio is preferably not higher than 0.69, and further preferably not higher than 0.68.
  • the material and structure of the grip 4 there is no particular limitation in the material and structure of the grip 4 , and those commonly used can be adopted as appropriate.
  • those commonly used can be adopted as appropriate.
  • the weight of the grip 4 itself is not particularly limited, it can be ordinarily set to be not smaller than 20 g but not larger than 55 g. If the weight of the grip 4 is too small, the strength of the grip 4 becomes low, and its durability may deteriorate. Therefore, the weight of the grip 4 is preferably not smaller than 23 g, and further preferably not smaller than 26 g. On the other hand, if the weight of the grip 4 is too large, the golf club 1 becomes heavy and difficult to swing. Therefore, the weight of the grip 4 is preferably not larger than 53 g, and further preferably not larger than 51 g.
  • the shaft 3 in the present embodiment is a steel shaft having a hollow structure and is manufactured with a method commonly used in the art.
  • the full length of the shaft 3 is represented as L S
  • the distance from the tip end (front end) 3 a of the shaft 3 to the center of gravity G of the shaft 3 is represented as L G .
  • a weight X of the shaft 3 in the present invention is set to be not smaller than 80 g but not larger than 140 g. If the weight of the shaft 3 is too small, the possibility becomes high for strengths such as flexural strength to be insufficient due to having a small thickness. Therefore, the weight of the shaft 3 is preferably not smaller than 85 g, and further preferably not smaller than 90 g. On the other hand, if the weight of the shaft 3 is larger than 140 g, it becomes difficult to perform a swing at an increased speed due to the whole golf club 1 being heavy. Therefore, the weight of the shaft 3 is preferably not larger than 135 g, and further preferably not larger than 130 g.
  • the length (full length) L S of the shaft 3 is set to be not smaller than 30 inches but not larger than 42 inches. If the length of the shaft 3 is too small, a turning radius of the swing becomes small, and it becomes difficult to obtain a sufficient head speed. As a result, the ball speed cannot be increased, and the flight distance of the ball cannot be extended. Therefore, the length of the shaft 3 is preferably not smaller than 32 inches, and further preferably not smaller than 34 inches. On the other hand, if the length of the shaft 3 is too large, the inertia moment at the grip end becomes large, and a powerless golfer can become easily overwhelmed in terms of power. Therefore, the head speed cannot be increased, and the flight distance of the ball cannot be extended. Thus, the length of the shaft 3 is preferably not larger than 41.5 inches, and further preferably not larger than 41 inches.
  • the position of the center of gravity itself of the shaft 3 is not particularly limited in the present invention, it is ordinarily within a range of, for example, for a shaft whose length is 39 inches, 595 to 505 mm from the tip end 3 a (front end) of the shaft 3 . If the position of the center of gravity G of the shaft 3 is located closer than 505 mm from the front end of the shaft 3 , there is a high possibility of not being able to increase head speed since the ease of swinging the club is not improved due to the position of the center of gravity not being sufficiently moved in the hand side direction.
  • the position of the center of gravity of the shaft 3 from the front end of the shaft 3 is preferably not closer than 510 mm, and further preferably not closer than 515 mm.
  • the position of the center of gravity G of the shaft 3 is farther than 595 mm from the front end of the shaft 3 , there is a high possibility of strengths such as flexural strength being insufficient due to a small thickness on the front end side of the shaft. Therefore, the position of the center of gravity of the shaft 3 from the front end of the shaft 3 is preferably not farther than 585 mm, and further preferably not farther than 575 mm.
  • the center-of-gravity rate Y is lower than 51.0(%), since the center of gravity of the shaft is located close to the front end side of the shaft, the weight of the head has to be reduced in order to obtain a swing balance equivalent to that obtained from a hitherto known club, and the degree of freedom in designing a head becomes small. Thus, the inertia moment of the head becomes small, and a technique for lowering the center of gravity cannot be implemented. Therefore, it becomes difficult to achieve a large ball flight distance.
  • the center-of-gravity rate Y is preferably not lower than 52.0, and further preferably not lower than 53.0.
  • the center-of-gravity rate Y is higher than 60.0, since the center of gravity of the shaft is located too close to the back end side of the shaft, even if the weight of the head is excessively increased in order to obtain a level of ease of swinging equivalent to that obtained from a hitherto known club, i.e., the same level of swing balance; it is still difficult to perform a swing since the club weight is also increased.
  • the weight is allocated on the back end side rather than on the front end of the shaft, the strength of the front end side of the shaft becomes small. Therefore, the center-of-gravity rate Y is preferably not higher than 58.0, and further preferably not higher than 56.0.
  • a thickness t of a portion up to 150 mm from the butt end 3 b of the shaft 3 toward the front end side of the shaft is set to be not smaller than 0.30 mm but not larger than 0.40 mm.
  • the thickness t is smaller than 0.3 mm, since the center of gravity of the shaft is located close to the front end side of the shaft, the weight of the head has to be reduced in order to obtain a swing balance equivalent to that obtained from a hitherto known club, and the degree of freedom in designing a head becomes small. Thus, the inertia moment of the head becomes small, and a technique for lowering the center of gravity cannot be implemented. Therefore, it becomes difficult to achieve a large ball flight distance.
  • the thickness t is preferably not smaller than 0.32 mm, and further preferably not smaller than 0.34 mm.
  • the thickness t is larger than 0.4 mm, since the center of gravity of the shaft is located too close to the back end side of the shaft, even if the weight of the head is excessively increased in order to obtain a level of ease of swinging equivalent to that obtained from a hitherto known club, i.e., the same level of swing balance; it is still difficult to perform a swing since the club weight is also increased.
  • the thickness t is preferably not larger than 0.38 mm, and further preferably not larger than 0.36 mm.
  • an outer diameter d of a portion up to 150 mm from the butt end 3 b of the shaft 3 toward the front end side of the shaft is set to be not smaller than 14.5 mm but not larger than 15.3 mm.
  • the outer diameter d is smaller than 14.5 mm, a flexural rigidity value EI of the butt side of the shaft becomes too low and the shaft becomes soft.
  • the outer diameter d is preferably not smaller than 14.7 mm, and further preferably not smaller than 14.9 mm.
  • the outer diameter d is preferably not larger than 15.4 mm, and further preferably not larger than 15.3 mm.
  • the number of steps included in a portion up to 400 mm from the butt end 3 b of the shaft 3 toward the front end side of the shaft is set to be not less than 5 but not more than 8.
  • the number of the steps is less than 5, the flexural rigidity value EI of the butt side of the shaft becomes too high, and the feel obtained when hitting a ball deteriorates since the shaft bends little and is felt as being hard. Therefore, the number of the steps is preferably not less than 6.
  • the number of the steps is more than 8, the flexural rigidity value EI of the butt side of the shaft becomes too low and the shaft becomes soft.
  • the number of the steps is preferably not more than 7.
  • the contained amount of retained austenite in the material of the shaft is set to be larger in a portion toward the butt end 3 b from this 600-mm part. That is, the contained amount of retained austenite is different in the tip end side of the shaft and in the butt end side of the shaft, with the boundary therebetween being the part 600 mm from the tip end 3 a of the shaft toward the butt end 3 b side. More specifically, the contained amount of retained austenite in the portion on the butt end side of the 600-mm boundary is set to be larger than the tip end side of the boundary.
  • the “boundary” is located closer than 600 mm from the tip end 3 a of the shaft with respect to the butt end 3 b side, the flexural rigidity value EI of the butt side of the shaft becomes too low and the shaft becomes soft. In addition, since directional stability of a hit ball deteriorates, the feel obtained when hitting a ball deteriorates. Therefore, the “boundary” is located preferably not closer than 650 mm, and further preferably not closer than 700 mm.
  • the “boundary” is located farther than 900 mm from the tip end 3 a of the shaft toward the butt end 3 b , the flexural rigidity value EI of the butt side of the shaft becomes too high, and the feel obtained when hitting a ball deteriorates since the shaft bends little and is felt as being hard. Therefore, the “boundary” is located preferably not farther than 850 mm, and further preferably not farther than 800 mm.
  • FIG. 2 is an illustrative diagram for the method for measuring the SG-type three point flexural strength.
  • load F was applied downward from above at a load point t 3 while the shaft 3 was supported from below at two support points t 1 and t 2 .
  • the position of the load point t 3 was a position dividing, into two equal parts, the interval between the support point t 1 and the support point t 2 .
  • the load point t 3 was matched with the point (T-point) that was to be measured, and measurement was conducted.
  • Example 4 Example 5 Example 1 Example 6 Example 7 Shaft weight [g] 95 95 95 95 95 Shaft full length [inch] 38 38 38 38 38 38 Center-of-gravity rate [%] 55 55 55 55 55 Thickness [mm] of a portion 0.35 0.35 0.35 0.35 0.35 from butt end to 150 mm therefrom Outer diameter [mm] of a portion 14.4 14.7 15 15.3 15.6 from butt end to 150 mm therefrom Number of steps 5 5 5 5 5 Contained amount of retained austenite Uniform Uniform Uniform Uniform Feel evaluation 5 4 3 2 1 Flexural strength (T-point) [kgf] 220 220 220 220 220 of front end part Flight distance [yard] 162 165 170 165 162
  • Example 1 Example 9
  • Example 10 Example 11 Shaft weight [g] 95 95 95 95 95 Shaft full length [inch] 38 38 38 38 38 38 38 Center-of-gravity rate [%] 55 55 55 55 55 Thickness [mm] of a portion 0.35 0.35 0.35 0.35 0.35 from butt end to 150 mm therefrom Outer diameter [mm] of a portion 15 15 15 15 from butt end to 150 mm therefrom Number of steps 4 5 6 5 5 5 Contained amount of retained austenite Uniform Uniform Larger in Larger in tip end butt end side side Feel evaluation 2 3 4 2 4 Flexural strength (T-point) [kgf] 220 220 220 210 220 of front end part Flight distance [yard] 162 170 168 168 168

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Golf Clubs (AREA)
US13/905,311 2012-05-31 2013-05-30 Golf club steel shaft Abandoned US20130324289A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012125139A JP2013248165A (ja) 2012-05-31 2012-05-31 ゴルフクラブ用スチールシャフト
JP2012-125139 2012-05-31

Publications (1)

Publication Number Publication Date
US20130324289A1 true US20130324289A1 (en) 2013-12-05

Family

ID=49670924

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/905,311 Abandoned US20130324289A1 (en) 2012-05-31 2013-05-30 Golf club steel shaft

Country Status (4)

Country Link
US (1) US20130324289A1 (zh)
JP (1) JP2013248165A (zh)
KR (1) KR101450455B1 (zh)
CN (1) CN103446734A (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160250529A1 (en) * 2015-02-26 2016-09-01 Acushnet Company Golf club with improved weighting
US9616298B1 (en) 2015-09-24 2017-04-11 Acushnet Company Golf club with improved weighting

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101535728B1 (ko) * 2012-12-03 2015-07-09 던롭 스포츠 가부시키가이샤 골프 클럽
JP5546701B1 (ja) * 2013-07-22 2014-07-09 ダンロップスポーツ株式会社 ゴルフクラブ
JP5546700B1 (ja) * 2013-07-23 2014-07-09 ダンロップスポーツ株式会社 ゴルフクラブ
JP5546672B1 (ja) * 2013-09-20 2014-07-09 ダンロップスポーツ株式会社 ゴルフクラブ
JP5546673B1 (ja) * 2013-09-20 2014-07-09 ダンロップスポーツ株式会社 ゴルフクラブ
JP5886392B1 (ja) * 2014-09-10 2016-03-16 ダンロップスポーツ株式会社 ゴルフクラブ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5022652A (en) * 1989-04-10 1991-06-11 Spalding & Evenflo Companies Lightweight steel golf shaft
US6984179B2 (en) * 2002-10-28 2006-01-10 Royal Precision, Inc. Golf club shafts having variable taper lengths
US7048645B2 (en) * 2002-11-20 2006-05-23 Sri Sports Limited Golf club shaft
US20080242438A1 (en) * 2007-03-29 2008-10-02 Nhk Spring Co., Ltd. Golf shaft, golf club, and production method for golf shaft
US20120071266A1 (en) * 2008-08-12 2012-03-22 Rice Scott A Golf club shaft with high balance point and golf club including same

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6215368U (zh) * 1985-07-09 1987-01-29
JPH0657274B2 (ja) * 1987-08-13 1994-08-03 株式会社横尾製作所 ゴルフクラブ用シャフトの製造方法
CA2013994A1 (en) * 1989-04-10 1990-10-10 Frank Fenton Lightweight steel golf shaft
JPH04317672A (ja) * 1991-04-16 1992-11-09 Sumitomo Rubber Ind Ltd ゴルフクラブシャフト
WO1998023338A1 (en) * 1996-11-28 1998-06-04 Wavex Corporation Golf club shaft having wave shaped reinforced part
JPH11267249A (ja) * 1998-03-19 1999-10-05 Daiwa Seiko Inc ゴルフクラブセット
JP2001037921A (ja) * 1999-05-24 2001-02-13 Yokohama Rubber Co Ltd:The アイアンゴルフクラブセット
JP2002052105A (ja) * 2000-08-09 2002-02-19 Yokohama Rubber Co Ltd:The ゴルフクラブ
JP2002102400A (ja) * 2000-10-02 2002-04-09 Nippon Shaft Co Ltd ゴルフクラブ用スチールシャフト
JP2003102884A (ja) * 2001-09-28 2003-04-08 Sumitomo Rubber Ind Ltd ゴルフクラブシャフト及びゴルフクラブシャフトの製造方法
JP2004081344A (ja) * 2002-08-23 2004-03-18 Sumitomo Rubber Ind Ltd ゴルフクラブ
JP2004201911A (ja) * 2002-12-25 2004-07-22 Yamaha Corp ゴルフクラブ
JP2007130087A (ja) * 2005-11-08 2007-05-31 Bridgestone Sports Co Ltd ゴルフクラブ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5022652A (en) * 1989-04-10 1991-06-11 Spalding & Evenflo Companies Lightweight steel golf shaft
US6984179B2 (en) * 2002-10-28 2006-01-10 Royal Precision, Inc. Golf club shafts having variable taper lengths
US7048645B2 (en) * 2002-11-20 2006-05-23 Sri Sports Limited Golf club shaft
US20080242438A1 (en) * 2007-03-29 2008-10-02 Nhk Spring Co., Ltd. Golf shaft, golf club, and production method for golf shaft
US20120071266A1 (en) * 2008-08-12 2012-03-22 Rice Scott A Golf club shaft with high balance point and golf club including same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160250529A1 (en) * 2015-02-26 2016-09-01 Acushnet Company Golf club with improved weighting
US9616298B1 (en) 2015-09-24 2017-04-11 Acushnet Company Golf club with improved weighting
US10046216B2 (en) 2015-09-24 2018-08-14 Acushnet Company Golf club with improved weighting
US10391373B2 (en) 2015-09-24 2019-08-27 Acushnet Company Golf club with improved weighting

Also Published As

Publication number Publication date
KR101450455B1 (ko) 2014-10-13
JP2013248165A (ja) 2013-12-12
CN103446734A (zh) 2013-12-18
KR20130135080A (ko) 2013-12-10

Similar Documents

Publication Publication Date Title
US20130324289A1 (en) Golf club steel shaft
JP5823122B2 (ja) ゴルフクラブ
US8808107B2 (en) Golf club
US7618331B2 (en) Golf club head
US8574095B2 (en) Golf club head
US7766765B2 (en) Wood-type golf club head
US9017185B2 (en) Golf club set
JP5823121B2 (ja) ゴルフクラブ
US20090082134A1 (en) Golf club head
US20100267463A1 (en) Golf Clubs and Golf Club Heads
JP3220764U (ja) 交換可能なソールを具備するゴルフクラブ
KR20120100816A (ko) 골프 클럽 헤드 및 이를 이용한 골프 클럽
US10688353B2 (en) Iron-type golf club head
JP2010029379A (ja) ウッド型ゴルフクラブヘッド
US8371955B2 (en) Wood-type golf club set
JP6307696B1 (ja) ゴルフクラブヘッド
US10493337B2 (en) Golf club set
US20190143182A1 (en) Golf club with a striking face providing improved performance for golf balls struck outside the center of the face
JP7168502B2 (ja) ウッド型ゴルフクラブセット
JP2021100461A (ja) ゴルフクラブヘッド及びゴルフクラブ
US20150045145A1 (en) Golf club head
US20140018186A1 (en) Golf club head
JP2019110974A (ja) ゴルフクラブヘッド
JP4657484B2 (ja) ゴルフクラブヘッド及びゴルフクラブ
JP2002017902A (ja) ゴルフクラブセット

Legal Events

Date Code Title Description
AS Assignment

Owner name: DUNLOP SPORTS CO. LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MATSUNAGA, KIYOFUMI;REEL/FRAME:030526/0008

Effective date: 20130508

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION