WO2001027244A1 - Body member with adjustable stiffness and frequency - Google Patents
Body member with adjustable stiffness and frequency Download PDFInfo
- Publication number
- WO2001027244A1 WO2001027244A1 PCT/US2000/028552 US0028552W WO0127244A1 WO 2001027244 A1 WO2001027244 A1 WO 2001027244A1 US 0028552 W US0028552 W US 0028552W WO 0127244 A1 WO0127244 A1 WO 0127244A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- body member
- load
- force
- insert
- adjuster
- Prior art date
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
- C07K14/70571—Receptors; Cell surface antigens; Cell surface determinants for neuromediators, e.g. serotonin receptor, dopamine receptor
-
- 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
- A63B53/08—Golf clubs with special arrangements for obtaining a variable impact
-
- 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
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B49/00—Stringed rackets, e.g. for tennis
-
- 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
-
- 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
- A63B60/22—Adjustable handles
- A63B60/28—Adjustable handles with adjustable length
-
- 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
Definitions
- This invention relates to the field of athletic equipment and, more specifically, to body members having an adjustable stiffness and frequency.
- the physical size of the club should correspond in some way to the size of the golfer. For example, a longer golf club would be suitable for a taller golfer.
- the weight of the club should also be considered since, in general, a golfer with greater physical strength can swing heavier clubs than golfers of lesser strength.
- the bending of a golf club shaft may be characterized by its bending stiffness and its vibrational bending frequency.
- the bending stiffness is a measure of how much the golf club shaft will bend (i.e., its displacement) due to an applied force at a specified location on the shaft. If the same force is applied in the same way to two different golf club shafts, the shaft with the smaller displacement is considered to be stiffer, as illustrated in Figure 1A.
- the vibrational bending frequency of a golf club shaft is the frequency at which the golf club shaft vibrates when bent and then suddenly released, for example, when being held at the grip end and deflected at the head. Such vibration of the shaft is similar to the motion of a car radio antenna when struck.
- These various shaft bending stiffnesses are to allow the custom assembly of a golf club with a vibrational bending frequency that best compliments a golfer's particular strength and swing speed.
- One problem with selecting golf clubs with a fixed bending stiffness and vibrational bending frequency is that it is rare for a golfer's swing tempo to precisely match with an off-the-shelf set of clubs.
- Another problem is that it is also rare for a set of clubs to have physical parameters such as bending stiffness, mass, and vibrational bending frequency consistent between each club within a set.
- One solution is to provide a custom made set of clubs where a golf professional or person with technical expertise consults with the golfer prior to the assembly of the golf club.
- the consultant chooses the golf club shaft bending stiffness, length, and head weight to best suit the individual golfer.
- a problem with providing a custom set of clubs is that commonly only a range of discrete vibrational bending frequencies are attainable. Furthermore, the range of discrete vibrational bending frequencies may not be available at all for certain combinations of shaft length and head weight.
- the vibrational bending frequency and shaft bending stiffness cannot easily be changed without re- manufacturing the go 1 f club .
- Some prior golf club shafts are designed to provide very specific shaft bending stiffnesses at different locations along the shaft's length.
- One prior golf club shaft uses an interior bar, within a hollow shaft, and a number of coupling inserts to alter shaft stiffness. When engaged, the coupling inserts attach the shaft to the interior bar, thus increasing the overall stiffness of the club.
- a problem with such a shaft is that it may provide only minimal stiffness increase due to the inefficient location of the central bar and its contribution to the overall bending moment of inertia. Further, the mass increase of such a device on the overall club mass may be substantial in relation to the stiffness change provided. Such added weight may not be desirable with certain golfers.
- Another problem with some prior golf clubs shafts is that their stiffness may not be altered after they have been assembled by the manufacturer.
- a golfer's skill level and preferences may change over time and, thereby, the golfer may desire a different stiffness to his clubs. As such, the golfer may be compelled to purchase a new set of clubs or to disassemble and reassemble his/her clubs using new components.
- One prior golf club design provides the capability of changing the shaft stiffness of a golf club after it has been assembled. The golf club's stiffness may be changed by pressurizing the shaft with air.
- One drawback of such a device is that the use of pressure levels necessary to achieve a real benefit may create significant safety issues.
- these prior golf clubs do not provide the individual golfer with the capability of changing the bending stiffness and the vibrational bending frequency of a given set of clubs after the clubs have been assembled and purchased without substantially changing the mass of the club or introducing significant safety issues.
- the present invention pertains to an apparatus for force adjustment within a body member.
- the apparatus includes a body member and a load member disposed within the body member to generate a force on the body member.
- the apparatus may also include an adjuster coupled to the load member to adjust the force on the body member.
- Figure 1 A illustrates the principles of bending stiffness.
- Figure IB illustrates one embodiment of a golf club having a force tuning device.
- Figure 2 illustrates a cut through view of one embodiment of a body member.
- Figure 3 illustrates one embodiment of the internal forces within a body member.
- Figure 4 illustrates one embodiment of an adjuster for adjusting the bending stiffness and vibrational bending frequency of a body member.
- Figure 5 A illustrates a cross section of one embodiment of a body member.
- Figure 5B illustrates cross sections of alternative embodiments of a coupler.
- Figure 5C illustrates alternative embodiments of a screw mechanism.
- Figure 6 illustrates an exploded view of one embodiment of a force tuning device contained within a body member.
- Figure 7 illustrates an alternative embodiment of insert assembly in a body member.
- the apparatus includes a body member having a bending stiffness and a vibrational bending frequency.
- a load member is coupled to the body member. The load member allows for the bending stiffness and the vibrational bending frequency to be altered. Such alteration may occur after the apparatus is assembled.
- the method and apparatus described herein may be implemented with various types of devices, for example, a golf club, as discussed in detail below.
- the method and apparatus are described in relation to a golf club, however, only for illustrative purposes and is not meant to be limited only to use in a golf club.
- the apparatus described herein may also be used with other hand held devices, such as, but not limited to, a fishing rod and a tennis racket.
- Figure IB illustrates one embodiment of a golf club having a force tuning device.
- Golf club 10 includes a head 20 and a body member 50.
- body member 50 may be referred to as a shaft.
- Body member 50 has a head end 25 and a handle end 30.
- Head end 25 may be coupled to head 20.
- handle end 30 is an area of body member 50 by which a user typically holds golf club 10.
- Handle end 30 may be wrapped in a material suitable for gripping by the user.
- handle end 30 may be coupled to a separate handle piece.
- the axial direction 15 is along the length of golf club 10.
- the performance of golf club 10 may be characterized by parameters such as its bending stiffness and its vibrational bending frequency.
- the bending stiffness of body member 50 is a measure of how much the body member will bend due to an applied force at a specified location.
- the vibrational bending frequency of body member 50 is the frequency at which body member 50 vibrates when bent and then suddenly released, for example, when being held at handle 30 and deflected at head 20. As body member 50 vibrates, the number of times that head end 25 moves back and forth, per a time period, is its vibrational bending frequency.
- the vibrational bending frequency depends on the bending stiffness of the body member 50, as well as the mass of body member 50 and head 20. If body member 50 is made stiffer, with the mass of body member 50 and head 20 constant, the vibrational bending frequency increases. Conversely, if the mass of body member 50 or head 20 is increased, with the bending stiffness of body member 50 remaining constant, the vibrational bending frequency decreases. Thus, the vibrational bending frequency of golf club 10 may be changed by altering its mass and/or its bending stiffness. Golf club 10 includes a device, within body member 50, for adjusting a force on body member 50 that is proportional to the change in bending stiffness and vibrational bending frequency of golf club 10.
- Figure 2 illustrates a cut through view of one embodiment of a body member.
- body member 250 may be body member 50 of Figure 1, with section A-A of Figure 2 corresponding to section A-A of Figure IB.
- body member 250 has a circular cross sectional structure with a cavity to contain a mechanism for adjusting the stiffness and frequency of the body member.
- body member 250 may have another cross sectional structure, for example, a square shape or an oval shape.
- body member 250 includes inner insert 208 and outer insert 202.
- the size and diameter of inserts 202 and 208 may be designed to provide coupling within body member 250 at a desired location. Inserts 202 and 208 are positioned within body member 250 around the section where stiffness of the body member is to be adjusted, as discussed below.
- outer insert 202 may be coupled to body member 250 at one of its ends and inner insert 208 may be coupled to body member 250 at its approximate center.
- an insert may be coupled at other positions within body member 250, for example, at the other end of body member 250.
- inserts 202 and 208 may be coupled to body member 250 through bonding.
- inserts 202 and 208 may be constrained within body member 250 by other methods, for example, integrally manufactured into body member 250. Such methods are well known in the art; accordingly, a more detailed description is not provided herein.
- a load member 206 extends between inserts 202 and 208.
- Load member 206 may be coupled to inner insert 208 at one end. The other end of load member 206 may be coupled to outer insert 202.
- load member 206 carries a tension load between the inserts 202 and 208 so that the section of body member 250 between inserts 202 and 208 may be subjected to compression along axial direction 215.
- load member 206 is a rod.
- load member 206 may be another type of elongated structural member capable of carrying a tension force along axial direction 215 of body member 250, for example, a tube or a cable.
- Load member 206 may be constructed of a tension retaining material that does not exhibit significant time degradation or creep that would lessen the amount of force carried. Creep refers to the property of a material whereby the physical dimension of the loaded part changes as a function of time as well as load. Steel, aluminum, titanium, invar, carbon fiber composites and boron fiber composites are examples of such materials that are highly resistant to creep.
- load member 206 may be configured to carry a compressive load.
- inserts and the load member are not limited only to the configuration illustrated in Figure 2.
- the inserts 202 and 208 may be located along different locations of body member 50 of Figure 2 in order to target the stiffness along prescribed regions of its length.
- insert 208 may be located at the head end 25 of Figure 1 to provide a greater effect on the kick- point of golf club 10 of Figure 1.
- the kick-point of a golf club is the location on the golf shaft at which the shaft exhibits the most curvature for a given deflection.
- the inserts and load member may be built into one or more of the shaft pieces.
- a load adjuster 203 is coupled to load member 206. Tuning of the bending stiffness and vibrational bending frequency of body member 250 may be performed at any time through use of load adjuster 203. In one embodiment, the tuning may be performed by turning load adjuster 203 in a rotational direction 216. Rotating load adjuster 203 produces a tension force in load member 206 and an opposite compression force body member 250, as illustrated in Figure 3.
- Figure 3 illustrates one embodiment of the internal forces within a body member. Changes in the bending stiffness and vibrational bending frequency of body member 350 is proportional to the axial force applied to it.
- a force 348 that is a compression load, in body member 350 causes a decrease in its bending stiffness and a corresponding decrease in its vibrational bending frequency.
- force 349 on load member 306 is a tension load
- reduction of force 349 which corresponds to an equal reduction in force 348, results in an increase in the bending stiffness and vibrational bending frequency of body member 350, up to the properties of a body member without tensioning member 306.
- a user may reversibly and repeatably tune body member 350 to a desired frequency by moving load adjuster 303.
- the internal force 349 on the load member 306 is described as being a tension load and the internal force 348 on body member 350 as being a compressive load. The description would also be applicable if the internal force 349 on the load member 306 were described as a compressive load and the corresponding internal force 348 on the body member 350 as being a tension load. In this embodiment, the change in bending stiffness and vibrational bending frequency of the body member 350 increases as the compressive internal force in the load member 306 was increased.
- the force on the load members in the figures may be described as a tension load and the force on the body members of the figures (e.g., body member 250 of Figure 2 and 450 of Figure 4) may be described as a compression load for illustrative purpose only.
- the force on the load members in the figures may be a compression load and the force on the body members in the figures may be a tension load.
- body member 350 is a golf club shaft, for example, a golfer may quickly tune the golf club to a preferred setting by turning load adjuster 303 to try the golf club at various vibrational bending frequencies.
- the vibrational bending frequency of a golf club having body member 350 may be measured quantitatively and correlated to a calibration scale on the body member. This provides an indicator by which a golfer can visually adjust the parameters of the shaft to a given setting.
- Figure 4 illustrates one embodiment of an adjuster for a force tuning device.
- outer insert 402 is disposed within end 430 of body member 450.
- One end of insert 402 has a lip 413 that transitions to a larger diameter than body member 450. The edge of lip 413 seats insert 402 against body member 450 when installed and prevents insert 402 from dropping into the cavity of body member 450. As such, insert 402 provides a firm attachment point to body 450 for additional components.
- load member 406 is attached to a coupler 404 that may be placed to insert 402.
- Load adjuster 403 is attached to coupler 404 from a side opposite that of load member 406.
- Load member 406 extends between insert 402 and another insert (not shown) within body member 450.
- Load member 406 carries a tension load so that the section of body member 450 between the inserts places that section into axial compression.
- coupler 404 has a coupler key 407 that fits into keyway slot 412.
- Keyway slot 412 allows coupler 404 and load member 406 to move along the axial direction 415 of body member 450, within insert 402.
- Keyway slot 412 also prevents relative rotation between coupler 404 and insert 402 about the axial direction 415 of body member 450.
- Figure 5 A illustrates a cross section of one embodiment of a body member.
- Load member 506 is attached to coupler 504 that is inserted into insert 502.
- coupler 504 has a non-circular cross section such that a pin 507 resides at one point along its circumference.
- Insert 502 has a correspondingly sized keyway 512 disposed within it that will accept pin 507. Keyway 512 prevents the rotation of coupler 504 when the load adjuster (e.g., load adjuster 403 of Figure 4) is turned. This forces coupler 504 to slide up and down within insert 502 (i.e., into and out of the page) in response to the amount of tension being applied by the load adjuster (not shown).
- load adjuster e.g., load adjuster 403 of Figure 4
- coupler 504 may be formed as an integral part of load member 506.
- coupler 504 may have other configurations to allow for axial motion of load member 506 (into and out of the page) while preventing rotation, for example, a spline, a flat, and a square, as illustrated in Figure 5B.
- coupler 404 is coupled to load adjuster 403.
- coupler 404 may be a screw mechanism.
- Coupler 404 may have male or female threads where it attaches to load adjuster 403. Turning load adjuster 403 in one direction causes coupler 403 to bring load member 406 and load adjuster 403 closer together.
- FIG. 5C Various configurations of a screw mechanism are illustrated in Figure 5C.
- the load member and coupler may be integrated into one component 505 of Figure 5C.
- coupler 404 may be another type of mechanisms for providing an axial load to load member 406, for example, a cam mechanism. Screw and cam mechanisms are well known in the art; accordingly, a more detailed description of their operation is not provided herein.
- the tuning of the bending stiffness and the vibrational bending frequency of body member 450 may be performed by adjusting load adjuster 403. In addition, this tuning procedure may be performed at any time after the assembly of the components within body member 450.
- the use of a linear screw mechanism enables the bending stiffness and vibrational bending frequency to adjusted over a continuous range of values, rather than just a few discrete values.
- a non-linear mechanism may be used to provide adjustment in a discrete range of values, for example, a ratchet mechanism.
- spring 411 may be positioned between load adjuster 403 and insert 402 to provide approximately a constant tension in body member 450, regardless of the amount of bending deflection of body member 450.
- spring 411 may be belleville springs for compactness, as shown in Figure 4.
- spring 411 may have other designs, for example, it may be a compressive or extensive coil spring.
- Spring 411 may be soft enough so that it would provide a relatively large ratio in the adjustment of load adjuster 403 to the force transmitted to load member 406. As such, changes in the force that produces tension on load member 406 may be easily controlled with broad tolerance on the adjustment requirements of load adjuster 403. This increases the robustness of the design. Without spring 411, very small changes in adjustment of load adjuster 403 may create very large tension forces if load member 406 is relatively stiff. In another embodiment, the selection of a sufficiently compliant load member 406 may reduce or eliminate the need for spring 411. Spring mechanisms are well known in the art; accordingly, a more detailed description of their operation is not provided herein.
- calibrated scale 416 may be used to provide a visual indication of the stiffness and frequency setting.
- calibrated scale 416 may be etched on the inner surface of insert 402 and viewed as load adjuster 403 is adjusted.
- calibrated scale 416 may be positioned at other locations to allow for a user to visually inspect the scale.
- calibrated scale 416 may be positioned on the outside surface of body member 450, with a window slot cut in body member 450 and insert 402 such that the position of load adjuster 403 may be visible from the exterior of body member 450.
- Figure 6 illustrates an exploded view of one embodiment of a stiffness and frequency tuning device within a body member.
- insert 608, load member 606, coupler 604, insert 602, spring 611, and load adjuster 603 may be assembled independent of body member 650. The assembled components may then be slid into body member 650 having a bonding agent pre-applied in appropriate locations to bond the inserts.
- insert 608 may be installed in the body member 650 by bonding insert 608 with a high strength adhesive such as an epoxy.
- insert 608 may be coupled to body member 650 by other methods, for example, by integrally forming the insert into the body member.
- Figure 7 illustrates an alternative embodiment of an insert assembly in a body member.
- Insert 708 may be a self-locking insert having gripping teeth 798 disposed around its outer surface.
- Self-locking insert 708 may be pressed into body member 750 until gripping teeth 798 bite into the inner surface 751 of body member 750.
- a bonding agent may not be necessary to anchor insert 708 to body member 750.
- self-locking insert 708 may have other configurations, for example, the self-locking insert may be threaded to accept a load member, have a hole to accept a load member anchored by some other means, or be integrally attached to the load member.
- the manufacturing process described above may be used to replace the current practice of manufacturing several different body member stiffness types and, thus, may reduce tooling and assembly costs for manufacturers.
- the use of an adjustable stiffness and frequency body member may reduce the inventory of wholesalers and retailers who currently have to carry several body members with different stiffness specifications to accommodate various users.
- body member 250 may be, for example, a fishing rod or a tennis racket frame.
- the apparatus described herein provides a means for optimizing the frequency and stiffness of a single body member or a group of body members (e.g., a set of clubs or group of tennis rackets) to improve their feel and performance in relation to an individual's swing.
- the apparatus described herein may be used to match the frequency between individual body members (e.g., club shafts and racket frames) so that the entire set may be tuned to a similar desired frequency.
- stiffness and frequency tuning may be accomplished after the set of body members has been assembled, without strict regard to their initial frequency values.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biophysics (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Toxicology (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- Neurology (AREA)
- Zoology (AREA)
- Gastroenterology & Hepatology (AREA)
- Biomedical Technology (AREA)
- Cell Biology (AREA)
- Genetics & Genomics (AREA)
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- Engineering & Computer Science (AREA)
- Golf Clubs (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU12057/01A AU1205701A (en) | 1999-10-14 | 2000-10-13 | Body member with adjustable stiffness and frequency |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US41868299A | 1999-10-14 | 1999-10-14 | |
US09/418,682 | 1999-10-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001027244A1 true WO2001027244A1 (en) | 2001-04-19 |
WO2001027244A9 WO2001027244A9 (en) | 2001-10-25 |
Family
ID=23659143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/028552 WO2001027244A1 (en) | 1999-10-14 | 2000-10-13 | Body member with adjustable stiffness and frequency |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU1205701A (en) |
WO (1) | WO2001027244A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001043835A3 (en) * | 1999-12-15 | 2002-05-02 | Charnnarong Laibangyang | Golf club with pre-tensioned shaft |
US7614969B2 (en) | 2005-08-23 | 2009-11-10 | Hammer Sports Inc. | Sticks for athletic equipment |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2992828A (en) * | 1956-06-14 | 1961-07-18 | Warren A Stewart | Prestressed golf club |
-
2000
- 2000-10-13 AU AU12057/01A patent/AU1205701A/en not_active Abandoned
- 2000-10-13 WO PCT/US2000/028552 patent/WO2001027244A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2992828A (en) * | 1956-06-14 | 1961-07-18 | Warren A Stewart | Prestressed golf club |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001043835A3 (en) * | 1999-12-15 | 2002-05-02 | Charnnarong Laibangyang | Golf club with pre-tensioned shaft |
US6394909B1 (en) | 1999-12-15 | 2002-05-28 | Charnnarong Laibangyang | Golf club with fixed-tension shaft |
US7614969B2 (en) | 2005-08-23 | 2009-11-10 | Hammer Sports Inc. | Sticks for athletic equipment |
US8323129B1 (en) | 2005-08-23 | 2012-12-04 | Meyer Rene P | Process for making composite athletic shaft |
Also Published As
Publication number | Publication date |
---|---|
WO2001027244A9 (en) | 2001-10-25 |
AU1205701A (en) | 2001-04-23 |
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