EP0701843A1 - Golfschlägerschaft mit mehreren Biegungspunkten - Google Patents

Golfschlägerschaft mit mehreren Biegungspunkten Download PDF

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Publication number
EP0701843A1
EP0701843A1 EP95114471A EP95114471A EP0701843A1 EP 0701843 A1 EP0701843 A1 EP 0701843A1 EP 95114471 A EP95114471 A EP 95114471A EP 95114471 A EP95114471 A EP 95114471A EP 0701843 A1 EP0701843 A1 EP 0701843A1
Authority
EP
European Patent Office
Prior art keywords
shaft
golf club
layers
sections
carbon fiber
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.)
Withdrawn
Application number
EP95114471A
Other languages
English (en)
French (fr)
Inventor
William H. Bolton
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.)
MITSUSHIBA INTERNATIONAL Inc
Original Assignee
MITSUSHIBA INTERNATIONAL Inc
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 MITSUSHIBA INTERNATIONAL Inc filed Critical MITSUSHIBA INTERNATIONAL Inc
Publication of EP0701843A1 publication Critical patent/EP0701843A1/de
Withdrawn legal-status Critical Current

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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
    • A63B53/10—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
    • 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
    • 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

  • This invention is directed to golf club shafts, in general, and to golf club shafts made of carbon fiber composite materials which are assembled with a unique configuration, in particular.
  • All of the shafts have been designed to provide substantial strength so that the shaft does not break.
  • the shafts are designed to provide various amounts of flexure and/or stiffness.
  • the golf club shafts have been designed to provide varying types of energy storage and release during the back swing and the forward swing in order to impart greater amounts of energy at the striking of a golf ball.
  • This invention is directed to a golf club shaft made of a composite material such as carbon prepreg or the like.
  • the shaft incorporates three cylindrical (or parallel) sections integrally joined together by a pair of tapered sections. By utilizing appropriate materials, the shaft can attain a suitable amount of flexure and strength.
  • the shaft is assembled by a unique method of providing the composite materials, assembling the composite materials and finishing the shaft.
  • Figure 1 is a schematic representation of a preferred embodiment of the golf club shaft made in accordance with the instant invention.
  • Figure 2 is a representation of the component pieces which are assembled to form the golf club shaft of the instant invention.
  • Figure 3 is a plan view of a partial assembly of the golf club shaft of the instant invention.
  • Figure 4 is a plan view of another partial assembly of the golf club shaft of the instant invention.
  • Figure 5 is a block diagram flow chart of the process by which the golf club shafts of the instant invention are assembled.
  • the golf club shaft 100 comprises three parallel chambers 101, 102 and 103. These chambers or sections are denoted as parallel in that they are, in effect, right cylinders.
  • the parallel sections 101 and 102 are joined by a tapered section 104. Similarily, parallel sections 102 and 103 are joined together by tapered section 105. As shown in Figure 1, the tapered sections 104 and 105 are quite exaggerated.
  • the same general construction is equally applicable to golf club shafts for so-called wood clubs and for iron clubs.
  • the most significant difference in the structure of the wood or iron club shafts is in the overall length dimensions.
  • the shaft used with a wood club is typically on the order of 45 inches in length while the shaft for an iron club is on the order of 39 inches in length.
  • the diameters of the shafts at the butt end are approximately 0.60 inches (wood) and 0.615 inches (iron) while the diameters are the tip end are approximately 0.335 inches (wood) and 0.370 inches (iron).
  • TABLE 1 there is shown a listing of the approximate dimensions (in millimeters) for the respective sections of the wood club shafts and the iron club shafts.
  • TABLE 1 (mm) CLUB SECTION TOTAL 101 104 102 105 103 WOOD LENGTH 200 110 330 400 100 1140 DIAM 15.24 15.24-11.5 11.5 11.5-8.5 8.5 IRON LENGTH 200 100 250 340 100 990 DIAM 15.62 15.62-13.3 13.3 13.3-9.4 9.4
  • FIG. 2 there is shown a plurality of components which are planar sheets of the appropriate carbon fiber material.
  • one of the suitable types of material for a preferred embodiment of the invention is referred to as a 5218 prepreg systems which is manufactured by Cytec Structural Materials, Inc. of Anaheim, California. This material is obtained in rolls or sheets which can be cut into preferred configurations such as are shown in Figure 2.
  • the prepreg material includes carbon fibers and resins which are arranged in a particular orientation. By appropriately cutting the sheet, pieces of material having different carbon fiber orientations can be provided.
  • the pieces 210 and 220 are planar cuts of the prepreg material.
  • the pieces 210 and 220 are, in essence, mirror images of one another. These pieces are cut upon different biases in the prepreg material. For example, piece 210 is cut on a +45° line while piece 220 is cut on a -45° line.
  • pieces 210 and 220 are comprised of elements which are disposed at a 90° relative bias overall.
  • the pieces 210 and 220 referred to as the bias layers, have butt ends and tip ends which are identical in dimensions.
  • each of the pieces 210 and 220 is cut to eliminate certain triangular portions 211 and 212 thereof which are designed to assist in developing the parallel sections 101, 102 and 103 and the tapered sections 104 and 105 shown in Figure 1.
  • the other elongated components 250 and 260 have the same length as the pieces 210 and 220, in this case approximately 1010 mm.
  • the tip end of piece 250 is slightly wider than the tip end of pieces 210 and 220.
  • the tip end of piece 260 is slightly wider than the tip end of piece 250.
  • the butt end of piece 260 is slightly wider than the width of the butt end of piece 250 which is slightly wider than the butt end of pieces 210 and 220.
  • the pieces 250 and 260 are referred to as layers 1 and 2 and are both cut with a 0° bias in the prepreg material. That is, in each piece the carbon fiber orientation is parallel to the long axis of the piece.
  • the reinforcing layers 230 and 240 are also cut with a 0° bias.
  • the reinforcing layer 230 is, of course, a right triangular piece while the reinforcing piece 240 is right trapezoidal in configuration.
  • the prepreg material typically, has a thickness of approximately 0.15 mm.
  • this material can be formed to have different tensile strength or tensile modulus.
  • the pieces 210 and 220 are formed of the so-called 30 ton or high modulus carbon fiber (as defined by the manufacturer) which includes 31% resin content.
  • the layers 1 and 2 are fabricated of an intermediate modulus carbon fiber material with 34% resin.
  • the reinforcing layers are fabricated of intermediate modulus carbon fiber material with 36% resin.
  • the reinforcing layer 240 is laid up or affixed to the surface of the piece 220.
  • the right angle corner of the right trapezoidal reinforcing layer 240 is placed in the right angle corner of the tip end of bias layer 220.
  • these layers are merely laid against each other. That is, the layers tend to adhere to each other sufficently due to the tackiness of the material so that the layers can be worked on subsequently.
  • the bias layer 220 with the reinforcing layer 240 thereon is covered by the bias layer 210 and the triangular reinforcing layer 230.
  • the bias layer 210 is aligned at the end thereof with the reinforcing layer 240.
  • the lower straight edge of bias layer 210 is displaced from, but aligned in parallel with, the lower straight edge of the reinforcing layer 240.
  • the offset between the two bias layers is, generally, equal to the diameter of the mandril 401 on which a rolling operation will take place.
  • the triangular reinforcing piece 230 is placed on top thereof.
  • the right angle corner of the triangular reinforcing layer 230 is aligned with the right angle produced by the tip end of bias layers 210 and 220 and the bottom edge of the bais layer 210 which is disposed on top of bias layer 220.
  • FIG. 5 there is shown a schematic diagram or functional flow chart of the manufacturing process for producing the improved golf club shafts of the invention.
  • the stage or phase is defined as the time when the individual pieces of composite material are operated upon.
  • the pieces that are cut during step 501 are the layers 210, 220, 230, 240, 250 and 260 which are shown in Figure 2.
  • the layers are then assembled as shown in Figures 3 and 4 and placed on the mandril 401.
  • the assembled layers, together with the mandril 401 are then placed in a conventional rolling machine which is adapted to roll the layers of prepreg material around the mandril 401.
  • the mandril is slightly tapered in accordance with the desires of the shaft manufacturer.
  • the reinforcing layer 240 is rolled into the tip end of the shaft as is the triangular reinforcing layer 230.
  • These components add strength and rigidity to the shaft at the tip end and, together with the cut outs shown in pieces 210 and 220, establish the parallel portions 101, 102 and 103 of the shaft 100 (see Figure 1).
  • step 504 a second rolling operation is performed in a conventional rolling machine.
  • the first 0° layer comprising layer 250 is rolled around the mandril and the rolled up layers 210, 220, 230 and 240 as occured during the first rolling operation.
  • step 505 a third rolling operation is conducted wherein layer 260 is rolled around the apparatus which was produced during the second rolling operation in step 504.
  • step 506 the unit, as produced by the third roll, is wrapped in a suitable wrapper such as, but not limited to, cellophane.
  • a suitable wrapper such as, but not limited to, cellophane.
  • This wrapper is fairly securely and snugly wrapped around the assembly produced in step 505.
  • This wrap layer retains the other prepreg layers in a desired configuration.
  • step 507 the apparatus is heat treated.
  • the entire apparatus is placed in an oven where it is heated to 250° F for approximately two hours.
  • the wrap layer retains the shape of the apparatus.
  • the shaft is then run through a grinding operation in step 509 wherein the surface of the assembly is rendered quite smooth.
  • step 510 the outer surface of the assembly is painted in a conventional fashion.
  • Many appropriate paint applicators are known in the art.
  • the type of paint used is also conventional.
  • step 511 the assembly is run through a fine grind procedure in order to smooth any imperfections which may have been produced during the painting step.
  • step 512 the assembly is submitted to a suitable process for applying logos, or other indicia to the surface of the assembly.
  • this process can be done with a silk screening operation.
  • step 513 the completed assembly is given a clear coat of lacquer, paint or the like to provide the ultimate finish which can be either glossy or matte, as desired.
  • the shaft is now fully completed and ready to be assembled to grips and heads to complete the manufacture of a golf club.
  • the shafts are not limited to the particular configuration of wood or iron, except as noted above with regard to the dimensions thereof.
  • step 505 can be omitted in some cases, in particular, in the manufacture of shafts for iron clubs.
  • step 506 material other than cellophane can be used to wrap the shafts in some instances.
  • step 507 can be altered, as desired, or as a function of the material used to form the shaft.
  • step 511 The finalizing steps of fine grinding (step 511), applying a logo or similar indicia (step 512) and applying a clear coat (step 513) can be omitted or modified.
  • the shaft 100 shown in Figure 1 is produced.
  • This shaft has a high standard of strength modulus, has flexibility suitable for most golfers and has two energy kick points such as shown in Figure 1 wherein the energy stored in the shaft during the backswing is released during the downswing by the golfer.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)
EP95114471A 1994-09-16 1995-09-14 Golfschlägerschaft mit mehreren Biegungspunkten Withdrawn EP0701843A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US305946 1981-09-28
US30594694A 1994-09-16 1994-09-16

Publications (1)

Publication Number Publication Date
EP0701843A1 true EP0701843A1 (de) 1996-03-20

Family

ID=23183042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114471A Withdrawn EP0701843A1 (de) 1994-09-16 1995-09-14 Golfschlägerschaft mit mehreren Biegungspunkten

Country Status (4)

Country Link
EP (1) EP0701843A1 (de)
JP (1) JPH08173580A (de)
AU (1) AU3064795A (de)
CA (1) CA2157329A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997030765A1 (en) * 1996-02-20 1997-08-28 Swix Sport A/S Golf club shaft
GB2324042A (en) * 1997-04-03 1998-10-14 You Chin San Golf club shaft

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100747433B1 (ko) * 2006-09-01 2007-08-08 주식회사 파인원 마디가 형성된 골프클럽용 샤프트
US20230062407A1 (en) * 2021-08-25 2023-03-02 LA Golf Partners LLC Golf putter shaft

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4319750A (en) * 1979-04-30 1982-03-16 Aldila, Inc. Golf shaft having controlled flex zone
GB2232605A (en) * 1989-04-10 1990-12-19 Spalding & Evenflo Golf club shafts
US5265872A (en) * 1992-12-23 1993-11-30 Unifiber Usa Golf club shaft having definable "feel"
JPH0691022A (ja) * 1992-09-10 1994-04-05 Nikko Golf:Kk ゴルフシャフト
JPH06114131A (ja) * 1991-02-08 1994-04-26 Fujikura Rubber Ltd ゴルフクラブシャフトおよびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4319750A (en) * 1979-04-30 1982-03-16 Aldila, Inc. Golf shaft having controlled flex zone
GB2232605A (en) * 1989-04-10 1990-12-19 Spalding & Evenflo Golf club shafts
JPH06114131A (ja) * 1991-02-08 1994-04-26 Fujikura Rubber Ltd ゴルフクラブシャフトおよびその製造方法
JPH0691022A (ja) * 1992-09-10 1994-04-05 Nikko Golf:Kk ゴルフシャフト
US5265872A (en) * 1992-12-23 1993-11-30 Unifiber Usa Golf club shaft having definable "feel"

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 18, no. 357 (C - 1221) 6 July 1994 (1994-07-06) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 395 (C - 1229) 25 July 1994 (1994-07-25) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997030765A1 (en) * 1996-02-20 1997-08-28 Swix Sport A/S Golf club shaft
GB2324042A (en) * 1997-04-03 1998-10-14 You Chin San Golf club shaft
GB2324042B (en) * 1997-04-03 2001-03-14 You Chin San Stepped golf club shaft

Also Published As

Publication number Publication date
JPH08173580A (ja) 1996-07-09
AU3064795A (en) 1996-03-28
CA2157329A1 (en) 1996-03-17

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