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WO2008035077A1 - Club de golf - Google Patents

Club de golf Download PDF

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Publication number
WO2008035077A1
WO2008035077A1 PCT/GB2007/003567 GB2007003567W WO2008035077A1 WO 2008035077 A1 WO2008035077 A1 WO 2008035077A1 GB 2007003567 W GB2007003567 W GB 2007003567W WO 2008035077 A1 WO2008035077 A1 WO 2008035077A1
Authority
WO
WIPO (PCT)
Prior art keywords
golf club
face
weight
club
mass
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.)
Ceased
Application number
PCT/GB2007/003567
Other languages
English (en)
Inventor
James Stephen Boyd Mather
David Fletcher
Dennis Vardy
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2008035077A1 publication Critical patent/WO2008035077A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • A63B53/04—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
    • 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
    • A63B53/045—Strengthening ribs
    • 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
    • A63B53/047—Heads iron-type
    • A63B53/0475—Heads iron-type with one or more enclosed cavities
    • 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
    • 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
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B2053/0491—Heads with added weights, e.g. changeable, replaceable
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0408—Heads characterised by specific dimensions, e.g. thickness

Definitions

  • the present invention relates to golf clubs and more particularly to golf clubs of the type known as woods.
  • An aim of this invention is to offer a better solution to this level of golfer, whilst not adversely affecting its usefulness to the better and elite player.
  • woods traditionally come in sets, comprising "irons and woods", so named because of the materials from which they were originally constructed many years ago.
  • the woods hereinafter referred to as the wood type, are divided into two categories, drivers and fairway woods, the first to be used off the tee at the start of a hole, and the latter off the fairway if long distances are still to be required.
  • the speed of the club head must be large and the angle of the loft on the club face must be low.
  • the former obviously depends on the abilities and strength of the golfer but can also be aided by making the shaft longer.
  • this increases the inertia of the club about the wrists and the shoulders of the golfer so making the club more difficult to swing.
  • the mass of the head is sometimes decreased but insufficiently to recover control.
  • Previous patented designs by the inventors present methods by which control can be mainly recovered without loss of distance. This involves the use of added mass within the area of the hands to balance the reduced head mass. The results in play are very satisfactory for the golfer. These patented designs will be incorporated into these new designs in order to enhance the playing performance of the clubs.
  • the overall size of the head was also limited by the use of this material. Designers sought other materials with a lower specific gravity than steel, yet with equivalent specific strength. This was found in Titanium and its alloys. The head size could be, and indeed was, increased to the very large units now available on the market. Some manufacturers still use steel as their design material and, by careful stress analysis, have produced larger heads with a very thin wall thickness.
  • the bulbous head offers a further advantage particularly to the weaker golfer.
  • the large flat area on the base of the club prevents the leading lower edge of the face digging into the ground. With poorly executed shots, the club can "bounce" along the floor and still make reasonable contact with the ball. This is an important facet of the design of both the driver and the fairway clubs.
  • the velocity with which the driver head approaches the stationary ball vary from 30 m/s for a weak amateur player to over 45 m/s for the professional.
  • the ball is elastic and is compressed during the early stage of impact.
  • the peak force between ball and the face of the club can be as large as 15kN.
  • the head of the driver is deformed.
  • Such deformations have been measured by various researchers, who show that the face becomes concave, and the crown or top and the sides of the club becomes more convex. Inevitably, this results in a loss of energy which could usefully be used to propel the ball forward.
  • the larger heads with thinner walls clearly deform more.
  • the degree of three-dimensional rotation depends mainly on two factors, the stiffness of the shaft and the inertia of the head.
  • the laws of Mechanics show that a stiffer shaft and a higher rotational inertia will both reduce the rotations.
  • the larger heads obviously have larger rotational inertias since their mass is placed peripherally well away from the centre of gravity of the head and the impact point with the ball.
  • the location of the centre of gravity will affect spin generation.
  • spin generation When the impact point on the face is not in line with the centre of gravity, side-spin and back-spin will be created.
  • irons where the centre of gravity is close to the face of the club where the ball impact takes place, this added effect on spin is small and the face can be made flat.
  • woods where the centre of gravity is well back, the spins generated will be large and, to counter this, the face is made in a convex curve both across and down the face. The degree of curvature controls the effect.
  • the present invention provides a golf club of the wood type including a shaft and head, the head comprising a box section having a front face, a bottom face, a top face and a rear face, a rear plate rigidly attached to and integrally formed with the bottom face of the said box section, said rear plate extending in a direction away from said rear face, and including a selected primary weight attached to or integrally formed with said rear plate at a predetermined position in relation to said front plate, said rear face of said box section being provided with one or more reinforcing ribs connecting said face of said box to said rear plate at a position adjacent to said selected primary weight to secure said primary weight in position during said use of said golf shaft.
  • each said club is provided with three ribs, two being positioned at the outer edges of the rear face and one positioned centrally therebetween, their location and dimensions being sufficient to provide no movement between the said rear face and the said rear plate.
  • each said club is provided with four ribs, two being positioned at the outer edges of the read face and two equi-distantly positioned therebetween, their location and dimensions being sufficient to provide no movement between the said rear face and the said rear plate.
  • the cavities created by the ribs are filled with lightweight materials.
  • the weight of the foam material filling the outside cavities are the same.
  • the weights of the outside cavities are different, enabling the Centre of Gravity (CG) to be moved from a central location and giving the clubhead an unequal mass distribution about the CG. It is already known that such a differential distribution can be used to correct or reduce a slice or a hook.
  • the lightweight material would be plastics material, for example polyurethane foam.
  • the attachment would be semi-permanent by gluing or similar process, thus complying with the regulations of not being alterable during the game, but removable by chemical action.
  • the rear face of said box section is provided with a plurality of holes.
  • a small weight is placed forming an array comprising a plurality of smaller weights each said small weight being less in mass then said primary weight.
  • said smaller weights are all equal in mass. In another form, said smaller weights are of different mass. This will enable the clubhead to be unequally weighted in relation to the centre of gravity (CG) of the head.
  • CG centre of gravity
  • the smaller weights are semi-permanently fixed into the box section but may be removable by suitable machine action.
  • the weight balance will be fixed, i.e. not alterable by a golfer during a game and thus complying with regulations, but could be altered, for example, to correct a slice, or to alter the club setting for a new player who may purchase the club second-hand.
  • Figure 1 shows in vertical cross-section a known traditional design of golf club head
  • Figure 2 shows in vertical cross-section a golf club head according to the present invention
  • Figures 3 a, 3b and 3 c show modified embodiments of the head of Figure 2;
  • Figure 4 shows a rear profile of the box section of the head shown in Figure 2;
  • Figure 5 shows a further modification of the golf club head shown in
  • Figure 6 shows in rear elevation a further modification of a golf club head according to the present invention.
  • Figure 7 shows a heavy mass introduced into the handle of the club with the centre of gravity placed close to the centre of the two hands gripping the golf club;
  • Figures 8a and 8b picture the club.
  • Figure 1 shows a traditional design of golf club head comprising a solid or hollow box, 1, which is shown in cross-section and comprises a semi-elliptical shape with a substantially flat front face, 2, and a baseplate, 3.
  • a hosel will be provided in a known position not shown in the cross- section and to this hosel a shaft and grip are fitted in known manner.
  • a reduction of the head deformation is achieved by stiffening the main structure of the head as shown in Figure 2.
  • the club head designed as shown in Figure 2 comprises a rigid box section 20, having a front face 22, a bottom face 24, a top face 26, and a rear face 28.
  • the box is formed with a front face formed integrally with the side and bottom faces with no additional insert in the front face thus forming a rigid structure.
  • the baseplate 24 is extended in the direction away from the front face 22 as shown by a rear extension plate 240, which may be formed integrally with the baseplate 24.
  • Figure 3 shows a selected primary weight 242 which is rigidly attached to or formed integrally with the rear extension plate 240. In the design, this weight can be adjustable in both mass and positioning relative to the front face 22.
  • the stiffening is achieved by the whole box section 20 being smaller than the normal bulbous structure of Figure 1 , and is therefore very much stiffer.
  • the deformation on impact with a golf ball will be much smaller than in normal clubs and certainly much smaller than the heads with very large volumes and large unsupported areas.
  • a stiff structure can be created at low mass. This is not needed with irons whose mass is normally higher since the club lengths are shorter. This stiffness also eliminates any trampoline effect, which is one of our aims. Accepting the exclusion of the trampoline effect offers the possibility of a consistent hit over a larger area. Since the golf clubs are of the wood type, the impact speed when striking the golf ball will normally be very high in relative golf speed terms possible up to 65 m/s.
  • the rear plate 240 will produce a tendency for the rear plate 240 to either bend or crack thus reducing the life-expectancy of the club. Also if the club is misused by, for example, hitting a very hard surface instead of the ball, then the impact force will be substantially increased leading possibly to severe cracking or bending of the rear plate due to the momentum generated by the deceleration of the primary weight 242.
  • the rear plate is provided with one of more stiffening ribs 2422 to 2424 as shown in Figure 3 a.
  • Figure 3b shows four such ribs as visualised in Figures 9 to 14.
  • Reduction of three dimensional rotational effects is achieved by moving the centre of gravity forwards to a point about 20 to 25 mm behind the face. This is forward to that of a conventional club and certainly even further forward to that of a large volume club. Having achieved these two aims, we need to match the club to the playing performance of the golfer.
  • the location of the CG is altered by adding the mass 242 at or near to the rear of the base plate, as shown in Figure 2. This moves the CG rearwards, producing more reaction for the offset hit. This is then countered by the increased rotational inertia created by the addition of this mass.
  • the mass 242 not only has momentum in the direction 2427 which would be expected in striking the ball, but if the ball is not struck accurately off the centre of the face it will have momentum in the direction of arrows 2428 and 2429.
  • This momentum which appears as a shock force when the ball or ground is accidentally struck is countered or absorbed by the ribs 2420, 2422 and 2424. Without these, the weight 242 would act to bend or crack the plate 240 thus breaking the golf club.
  • the mass 242 is typically only 20 to 30 g, the head speed of the golf club on impact of up to 65 m/s produces a shock sufficient to bend the base plate about its junction with the rigid box.
  • the ribs 2420, 2422, and 2424 must be of sufficient strength to withstand this force if the club were to come to rest virtually instantly as is the case when the club strikes the ground.
  • the mass would be placed away from the rear of the base plate which would enable the golfer to create the desired spin for manoeuvring the ball.
  • the mass, 242 is added at any location as shown in Figure 3 a, to counter the effects of the golfers swing or to add to the effects needed by the elite golfer.
  • the rear face 28 shown in Figure 4 can be provided with holes 282, 284, and 286 which can further adjust the centre of gravity of the club.
  • the concentrated mass 242 is usually in the form of a block of steel or other dense material. Typically the mass of this block is 20 to 30 g and its location is 40 to 50 mm behind the front face 22. It is essential that the flat base is retained not only as a useful mount for the mass but also as an aid to the weaker golfer.
  • the mass would be chosen to give the same overall weight, but it would be placed closer to the face so that the location of the CG is maintained. Where the golfer normally uses clubs with light heads, the mass is light and placed towards the extremity of the extended base.
  • a weight 300 is provided within the shaft 30 as shown diagrammatically in Figure 7.
  • the weight 300 is preferably provided by sliding a rubber/silicone (or other similarly flexible) material down the inside of the shaft which, as is the case with all modern clubs, is hollow. The weight is positioned such that its centre of gravity
  • COG is located within the region of the lower hand when both hands are placed on the club.
  • the rubber/silicone insert also provides vibration damping for the player.
  • the clubs would be made with different lofts to accommodate the requirements of the golfer and these lofts would cover a range of at least 6 degrees, typically from 9 degrees to 15 degrees. Should it be necessary to fine tune the flight of the ball, particularly for an elite golfer, then the added mass can be split into 2 masses, 242, 244, and placed partly on the base and partly on the rear of the stiffened section as shown in Figure 5. This raises the centre of gravity of the head and thereby produces a higher trajectory.
  • the rear plate 28 has been provided with four holes 281, 283, 285 and 287. These holes may be filled with lightweight plastic plugs, 281', 283', 285', and 287', each having a weight substantially less than said primary weight 242.
  • the total mass of the four plugs would be about 20 g. Normally these would each be 5 g and placed equally in all the holes. But it is intended that there would also be plugs of 2.5 g and 7.5 g. These, when located in certain holes, would alter the location of the centre of gravity and therefore the performance of the club.
  • hole 287 For a player who normally draws or hooks the ball, the 7.5 g plug would be placed in hole 281, and the 2.5 g plug in hole 283. Two 5 g plugs would be placed in holes 285 and 287.
  • hole 283 For a golfer who slices, hole 283 would have a 7.5 g plug and hole 281 would have 2.5 g plug.
  • hole 285 For the player who hits the ball high but wants more penetration, hole 285 has 7.5 g, hole 287 has 2.5 g and the others 5 g each. For a player who drills the ball low, hole 287 is where the dominant mass will go.
  • the club can be altered for a subsequent player who may purchase the clubs second-hand.
  • the total mass available to be added in the plugs is about 20 g. If the head is made from titanium, then the mass available will be 40 or 50 g. Therefore the added mass in the plugs may then be between 20 and 50 g.
  • the mass of the plugs could be equally divided and may have variations up to ⁇ 5 g.
  • the plugs would be typically of lightweight plastic and made with a lip which allows the plug to be clipped into place and only removed with some force. This is essential since the forces of impact are very large and might displace the plug. It is a Rule of Golf that the club must not be modified during a round although modifications between rounds is allowed.
  • the plugs, and plastic inserts may be provided with, for example, a maker's name or logo.
  • FIG 8a A practical embodiment is shown in Figure 8a.
  • the face plate 22 may be cast in or pressed into the head in a later operation.
  • the figure also shows the hosel and shaft connection 30.
  • the width W is between 90 and 100 mm and the height H between 45 and 60 mm.
  • the centre of gravity of the head unit is approximately 25 mm from the centre C of the face and 22 to 25 mm up the face from the base plate.
  • the overall mass of the driver head shown in this example is between 180 and 195 g-

Landscapes

  • 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)
  • Golf Clubs (AREA)

Abstract

La présente invention concerne un club de golf comprenant une section de boîtier rigide (20) présentant une plaque de base arrière allongée (240) qui dispose d'un poids primaire supplémentaire (242).
PCT/GB2007/003567 2006-09-20 2007-09-20 Club de golf Ceased WO2008035077A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0618450A GB2441973A (en) 2006-09-20 2006-09-20 Golf club
GB0618450.1 2006-09-20

Publications (1)

Publication Number Publication Date
WO2008035077A1 true WO2008035077A1 (fr) 2008-03-27

Family

ID=37421257

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/003567 Ceased WO2008035077A1 (fr) 2006-09-20 2007-09-20 Club de golf

Country Status (2)

Country Link
GB (1) GB2441973A (fr)
WO (1) WO2008035077A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63264085A (ja) * 1987-04-23 1988-10-31 マルマンゴルフ株式会社 ゴルフクラブの中空ヘツド
US5197737A (en) * 1989-06-01 1993-03-30 Taylor Made Golf Company Putter head
US5499814A (en) * 1994-09-08 1996-03-19 Lu; Clive S. Hollow club head with deflecting insert face plate
US5941782A (en) * 1997-10-14 1999-08-24 Cook; Donald R. Cast golf club head with strengthening ribs
WO2001010513A1 (fr) * 1999-08-10 2001-02-15 Lucini Italia Company Club de golf
US6203443B1 (en) * 1998-10-02 2001-03-20 Jrd Golf, Llc Golf putter
JP2001070486A (ja) * 1999-09-02 2001-03-21 Bridgestone Sports Co Ltd ゴルフクラブヘッド
US20050075192A1 (en) * 2003-10-07 2005-04-07 Han Don K. Golf club head diaphragm

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6273831B1 (en) * 1999-09-03 2001-08-14 Callaway Golf Company Golf club head with a polymer insert
US6896625B2 (en) * 2003-01-10 2005-05-24 Macgregor Golf Company High moment of inertia putter having adjustable weights

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63264085A (ja) * 1987-04-23 1988-10-31 マルマンゴルフ株式会社 ゴルフクラブの中空ヘツド
US5197737A (en) * 1989-06-01 1993-03-30 Taylor Made Golf Company Putter head
US5499814A (en) * 1994-09-08 1996-03-19 Lu; Clive S. Hollow club head with deflecting insert face plate
US5941782A (en) * 1997-10-14 1999-08-24 Cook; Donald R. Cast golf club head with strengthening ribs
US6203443B1 (en) * 1998-10-02 2001-03-20 Jrd Golf, Llc Golf putter
WO2001010513A1 (fr) * 1999-08-10 2001-02-15 Lucini Italia Company Club de golf
JP2001070486A (ja) * 1999-09-02 2001-03-21 Bridgestone Sports Co Ltd ゴルフクラブヘッド
US20050075192A1 (en) * 2003-10-07 2005-04-07 Han Don K. Golf club head diaphragm

Also Published As

Publication number Publication date
GB2441973A (en) 2008-03-26
GB0618450D0 (en) 2006-11-01

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