WO1998036802A2 - Club de golf - Google Patents

Club de golf Download PDF

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Publication number
WO1998036802A2
WO1998036802A2 PCT/GB1998/000530 GB9800530W WO9836802A2 WO 1998036802 A2 WO1998036802 A2 WO 1998036802A2 GB 9800530 W GB9800530 W GB 9800530W WO 9836802 A2 WO9836802 A2 WO 9836802A2
Authority
WO
WIPO (PCT)
Prior art keywords
golf club
tube
shaft
club shaft
tubes
Prior art date
Application number
PCT/GB1998/000530
Other languages
English (en)
Other versions
WO1998036802A3 (fr
Inventor
Gordon Tilley
Original Assignee
Maxibuy Limited
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
Priority claimed from GBGB9703429.2A external-priority patent/GB9703429D0/en
Application filed by Maxibuy Limited filed Critical Maxibuy Limited
Priority to AU61093/98A priority Critical patent/AU6109398A/en
Publication of WO1998036802A2 publication Critical patent/WO1998036802A2/fr
Publication of WO1998036802A3 publication Critical patent/WO1998036802A3/fr

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
    • 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
    • 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
    • A63B53/005—Club sets
    • 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
    • A63B53/10—Non-metallic shafts
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
    • A63B2209/023—Long, oriented fibres, e.g. wound filaments, woven fabrics, mats
    • 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
    • A63B53/02—Joint structures between the head and the shaft
    • 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
    • A63B60/002—Resonance frequency related characteristics
    • 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
    • A63B60/0081—Substantially flexible shafts; Hinged 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
    • A63B60/06—Handles
    • 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
    • A63B60/06—Handles
    • A63B60/08—Handles characterised by the material
    • 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
    • A63B60/06—Handles
    • A63B60/10—Handles with means for indicating correct holding positions

Definitions

  • the present invention relates to a golf club and, in particular, to a golf club constructed from state-of-the-art materials in a manner that brings high performance equipment within the affordable range of the majority of players. It has long been a desirable goal of golf equipment manufacturers to develop equipment which, by virtue of its design, contributes to improved playing performance on the part of a user without contravening the rules of the game.
  • a tapered mandrel is required, the usual arrangement being such that the largest diameter section is positioned near the butt or handle section of the shaft, tapering down to the smallest diameter near the point where the shaft is joined to the club head.
  • Computer stress analysis shows that the portion of the shaft at which the club head joins the shaft has the greatest stress when a player swings the club and strikes a golf ball. The head tries to break away from the shaft on impact with the stationary golf ball.
  • the invention is a golf club shaft comprising a plurality of co-axially disposed tubes connected to one another at a stabilising joint or joints, said golf club shaft having an upper section adapted to form a grip portion and a lower section adapted to be connected to a club head, characterised in that: said tubes are parallel-sided and of differing cross-sectional sizes, the arrangement being such that said lower section is constituted by the tube of smallest cross-section, and the relative diameters of the tubes being such that the upper end of a tube is receivable within the bore at the lower end of its neighbour.
  • frequency and “frequency matching” will be well understood by persons skilled in the art.
  • the frequency is a measure of a club's rigidity and the term frequency matching is used to describe the even vibration of each club in a set.
  • the present invention enables perfect frequency matching of individual clubs within a set because of the parallel tube shaft design and the method of construction.
  • a golf club shaft constructed in accordance with the above is the first of its type to use parallel-sided tubes of titanium alloy or a pre-stressed carbon fibre composite material.
  • the fibre orientation is such that the loads and stresses are transmitted along the co-axial tubular array via the carbon fibre reinforcements, thereby avoiding concentration of stress at traditionally vulnerable positions. The loads and stresses are dissipated evenly and efficiently throughout the shaft, thereby minimising the risk of breakage.
  • this efficient transfer of energy allows greater impact force to be imparted to a golf ball during execution of a golf stroke, from the player's hands and arms to the club head, via the shaft.
  • the polymeric matrix material is a thermosettable material, such as an epoxy resin or a vinyl ester resin.
  • connections between adjoining lengths of tube may be strengthened with a ferrule of, for example, titanium or titanium alloy.
  • the ferrule may be embedded in the fibre layers.
  • a length of parallel-sided tube constructed from titanium alloy may be used as the lowermost tube in the golf club shaft. Furthermore, the same alloy may also be used for the other tube or tubes in the shaft.
  • the construction of parallel-sided titanium tubes is much cheaper and more consistent than swaging or forging tapered tubes, and they have the same benefits as the tubes constructed from extruded carbon fibre material described elsewhere in this specification. Moreover, many of the difficulties associated with processing titanium are eliminated by such a simplified construction, hence contributing to the affordability of the finished product.
  • the most preferred arrangement is a hybrid construction in which the lowermost tube is formed of a parallel-sided titanium alloy tube and the uppermost tube is formed of a parallel-sided tube of pre-stressed carbon fibre composite material.
  • Such an arrangement is thought to provide the optimum distribution of weight, since the butt end of the shaft is light in weight, whilst the tip end nearest the club head is relatively more heavy.
  • a further advantage of this preferred arrangement is that the lowermost tube is less susceptible to minor variations in its structural homogeneity, at the very point where stress concentration might occur.
  • a ferrule may be used for strengthening purposes between adjoining lengths of tube, so a ferrule may also be used at the tip of the golf club shaft where it is joined to the club head.
  • the ferrule may overlap or partially encase the fibre ends to protect them from accidental impact or abrasion leading to fibre breakage.
  • the ferrule may be omitted and the lowermost tube may be considered as an elongated ferule extending to the first intermediate tube joint above the golf club head.
  • the invention also includes within its scope a golf club using a golf club shaft as described above in combination with a forged golf club head, said golf club head comprising an assembly of a top element, a base element and a face element welded together to form a club head with a wedge-shaped cross- section in the fore to aft direction, each of said elements being constituted by a sheet of forged metal shaped with only a single curvature, and further comprising a metal tube inserted through said top element serving as a seat for a golf club shaft, said tube being welded to connecting surfaces provided on the elements.
  • Figure 1 is a perspective view of a golf club fitted with a modular shaft in accordance with one embodiment of a first aspect of the invention
  • Figure 2 illustrates the construction of a constituent tube of the modular shaft of Figure 1 , showing the arrangement of carbon fibre reinforcement
  • Figure 3 is a part cross-sectional view showing a stabilising joint and ferrule
  • Figure 4 is another part cross-sectional view showing an arrangement of a reinforcing ferrule at the tip of the shaft where it is joined to a club head
  • Figure 5 is a perspective view of a complete welded assembly of forged metal sheets forming a golf club head in accordance with a second aspect of the invention
  • Figure 6 is an exploded perspective view showing the component forged metal sheets prior to assembly
  • Figure 7 is a perspective view of a part-finished assembly showing a hole provided in the top sheet for receiving a metal tube serving as a seat for the golf club shaft;
  • Figure 8 is a perspective view of the finished assembly complete with tube welded in position
  • Figure 9 is a cross-sectional view through the club head of Figures 5 to 8, showing the wedge shape.
  • a golf club 10 is shown consisting essentially of a shaft 20 and a head 50.
  • the shaft 20 is of a modular construction and consists of a pair of parallel-sided tubes 21 and 22 of different diameters arranged co-axially, with a portion of the smaller diameter tube 21 received in the bore of the larger diameter tube 22.
  • the smaller diameter tube 21 forms the lowermost portion of the shaft 20 and is reinforced at its lower end by a titanium ferrule 23 where the shaft is joined to the club head 50.
  • the larger diameter tube 22 forms the upper part of the shaft 20 and is provided at its upper end with a grip portion 24.
  • An intermediate ferrule 25 is provided at the lower extremity of tube 22 to protect the end thereof for reasons which will be explained in more detail below.
  • Figure 2 shows the construction of the tubes 21 and 22, in particular the arrangement of carbon fibre reinforcement.
  • the main constructional feature of the tubes is a layer 26 of straight, pre-stressed and tensioned carbon fibres embedded in a matrix of curable plastics material.
  • the layer 26 is overwound by more carbon fibres 27 oriented at approximately ⁇ 45 ° relative to the longitudinal axis of the tube.
  • the fibres in the overlayer 27 are also under tension.
  • Figure 3 is a part cross-sectional view showing a stabilising joint between the two tubes 21 and 22 and an intermediate ferrule 25 at the base of larger diameter tube 22.
  • the purpose of the intermediate ferrule 25 is to provide protection to the fibre ends which would otherwise be exposed at the lower extremity of the tube 22.
  • the upper end of tube 21 is received within the bore of tube 22 and the two tubes overlap by an amount " 2" which is at least as great as 4 times the internal diameter of tube 22. This degree of overlap ensures that the joint is stable and that flexure of the modular shaft does not result in separation of its component tubes.
  • the outer surface of tube 21 is bonded to the inner surface of tube 22 in the region of overlap.
  • Figure 4 is a part cross-sectional view showing a reinforcing ferrule 23 at the tip of the shaft 20 where it is joined to the club head 50.
  • the ferrule 23 is a titanium tube and may be welded to formations provided within the club head 50 for ensured rigidity.
  • the bore of ferrule 23 is adapted to receive the lower end of tube 21 and protects the exposed fibre ends thereof from accidental damage.
  • the resulting carbon fibre composite, impregnated with epoxy resin or vinyl ester resin as a matrix typically contains 65%, but possibly up to 75%, by volume of fibre in proportion to resin content. It is designed to produce an upper tube of a stiffness measured in a vibration frequency of between 900 and 1000 cycles per minute, measured on a one metre length sample. The lower tube requires a vibration frequency of between 500 and 600 cycles per minute, also measured on a one metre length sample. The higher modulus materials give the optimum frequency at a lighter weight due to less material being required.
  • Lighter weight is desirable in the upper or larger tube to compensate for greater weight in the lower and thinner tube, which is helpful in assisting the pendulum effect when swinging the complete club, without increasing overall weight.
  • the vibration frequency is within the range given above for the carbon fibre variant, but at the lower end of the scale due to the lower modulus of elasticity of titanium compared to carbon fibre composite.
  • the best alloy of titanium for this application is titanium containing 3% aluminum and 2.5% vanadium commonly denoted Ti-3-2.5.
  • Typical wall thicknesses range from 0.48 mm to 0.89 mm, with 0.48 mm being the lightest and most flexible suitable for ladies and slow swinging players.
  • 0.89 mm thick tubing is better suited to professional and hard hitting players. All the alloys are preferably work hardened and heat treated to provide optimum and consistent flex, surface hardness and torsional strength suitable for lasting qualities required in a golf club shaft.
  • At least the lowermost tube 21 may be substituted by a parallel-sided tube of titanium alloy.
  • the alloy may be a commercially-available aerospace alloy commonly designated as Ti-3-2.5. This alloy has a titanium metal base and contains as its major alloying constituents roughly 3% by weight of aluminium and 2.5% by weight of vanadium.
  • the other tubes in the shaft may also be substituted by such parallel-sided titanium alloy tubes.
  • Figures 1 , 3 and 4 have not been drawn to represent a titanium alloy-shafted golf club in particular, persons skilled in the art will appreciate that the tubes illustrated in these Figures could equally well be made from titanium alloy. Their parallel-sided construction, nested arrangement and method of jointing are the same as described above for the pre-stressed carbon fibre composite variant.
  • a metal club head 50 which is a hollow construction formed from a welded assembly of three forged titanium sheets or plates. These plates, namely the top plate 51 , the bottom plate 52 and the face plate 53 are shown in exploded view in Figure 6.
  • Figure 7 shows a partially-assembled club head 50 in which the top plate 51 and the bottom plate have already been welded together.
  • Top plate 51 is formed with a hole 54 which receives a tube 23 that serves as a seat for the golf club shaft.
  • the tube 23 is shown in position in Figure 8. It is welded in place at weld lines 55 prior to the final step of welding the face plate 53 in position.
  • Figure 8 also shows in dotted outline a triangle ABC which is more clearly discernible in Figure 9.
  • This Figure shows the club head 50 in cross- section from fore to aft and clearly illustrates its wedge shape.
  • the three plates 51 , 52 and 53 are each formed with only a single curvature. There are no compound curves in the club head 50 and hence it is easier and cheaper to manufacture than club heads of the prior art which mimic traditional "woods" in profile. Moreover, an added benefit of the wedge- shaped cross-section is that more of the stroke energy is imparted to the ball during impact.
  • the top plate 51 and bottom plate 52 are better configured to resist such deformation.
  • the inventive club head does not become domed during impact with a golf ball because the curvature of the component plates is not a compound curvature. Instead, the impact forces are transmitted to the apex "B" of the wedge and reflected back to the face plate 53. This reflection serves to increase the amount of effective energy transferred to the ball, so it is able to travel further.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Earth Drilling (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Golf Clubs (AREA)

Abstract

La présente invention concerne un club (10) de golf comprenant un shaft (20) formé par une pluralité de tubes (21,22) disposés co-axialement, reliés entre eux par un ou plusieurs joints stabilisateurs. Le shaft (20) est pourvu d'une section supérieure formant un grip (24) et d'une partie inférieure reliée à la tête (50) du club. Les tubes (21, 22) ont des bords parallèles et des sections transversales de tailles différentes. La section inférieure est constituée par le tube de la section transversale la plus petite. Les diamètres relatifs des tubes (21, 22) sont tels que l'extrémité supérieure d'un tube peut s'emboîter dans l'alésage de l'extrémité inférieure du tube voisin. De préférence, les tubes (21, 22) sont faits dans un matériau constitué (a) d'un alliage de titane, (b) d'un mélange de (i) une matrice polymère extrudée renforcée par des fibres (26) de carbone continues, droites, précontraintes et tendues, les fibres étant alignées avec l'axe longitudinal du shaft (20), et (ii) des enroulements (27) continus de filaments également précontraints, tendus et ininterrompus ou (c) d'un mélange de matériaux des catégories (a) et (b).
PCT/GB1998/000530 1997-02-19 1998-02-19 Club de golf WO1998036802A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61093/98A AU6109398A (en) 1997-02-19 1998-02-19 Golf club

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9703429.2 1997-02-19
GBGB9703429.2A GB9703429D0 (en) 1997-02-19 1997-02-19 Golf club
GB9715581A GB2322307A (en) 1997-02-19 1997-07-23 Reinforced extruded golf club shaft
GB9715581.6 1997-07-23

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09367592 A-371-Of-International 1999-12-03
US10/034,253 Continuation-In-Part US20020128087A1 (en) 1997-02-19 2002-01-03 Golf club

Publications (2)

Publication Number Publication Date
WO1998036802A2 true WO1998036802A2 (fr) 1998-08-27
WO1998036802A3 WO1998036802A3 (fr) 1998-11-12

Family

ID=26311022

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/000530 WO1998036802A2 (fr) 1997-02-19 1998-02-19 Club de golf

Country Status (2)

Country Link
AU (1) AU6109398A (fr)
WO (1) WO1998036802A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1216727A1 (fr) * 2000-12-21 2002-06-26 True Temper Sports, Inc. Manche de club de golf fait d'une combinaison de matières métalliques et composites
US7413520B1 (en) * 2007-03-09 2008-08-19 Callaway Golf Company Golf club head with high moment of inertia

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2809144A (en) * 1955-01-27 1957-10-08 Narmco Sporting Goods Company Method of making a composite golf shaft for a golf club
US3457962A (en) * 1965-11-16 1969-07-29 Samuel M Shobert Golf club shaft and method of forming the same
GB1327246A (en) * 1970-09-22 1973-08-15 Nat Res Dev Fibre reinforced composites
US3974012A (en) * 1973-12-05 1976-08-10 Hogarth Harold P Apparatus and method for forming tapered tubular shafts
US4123055A (en) * 1977-01-03 1978-10-31 Brill Harry M Golf clubs
GB2053698B (en) * 1979-07-25 1983-02-02 Dunlop Ltd Golf club
FR2580506B1 (fr) * 1985-04-19 1987-06-19 Viellard Paul Henri Methode de fabrication des clubs de golf obtenus par frettage de materiaux metalliques composites permettant de controler leurs caracteristiques mecaniques et metrologiques
AU593246B2 (en) * 1985-04-19 1990-02-08 Paul-Henri Viellard Manufacturing of golf clubs
US4836545A (en) * 1988-11-07 1989-06-06 Pompa J Benedict Two piece metallic and composite golf shaft
US5253867A (en) * 1989-09-27 1993-10-19 Gafner Donald M Multi-component shaft for golf clubs
US5259614A (en) * 1992-08-06 1993-11-09 Greer Julian A Composite seamless filament-wound golf club shaft and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1216727A1 (fr) * 2000-12-21 2002-06-26 True Temper Sports, Inc. Manche de club de golf fait d'une combinaison de matières métalliques et composites
US7413520B1 (en) * 2007-03-09 2008-08-19 Callaway Golf Company Golf club head with high moment of inertia
US7431666B2 (en) * 2007-03-09 2008-10-07 Callaway Golf Company Golf club head with high moment of inertia
US7431667B2 (en) * 2007-03-09 2008-10-07 Callaway Golf Company Golf club head with high moment of inertia

Also Published As

Publication number Publication date
AU6109398A (en) 1998-09-09
WO1998036802A3 (fr) 1998-11-12

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