US20190118045A1 - String set, main string, and cross string - Google Patents

String set, main string, and cross string Download PDF

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Publication number
US20190118045A1
US20190118045A1 US16/096,454 US201716096454A US2019118045A1 US 20190118045 A1 US20190118045 A1 US 20190118045A1 US 201716096454 A US201716096454 A US 201716096454A US 2019118045 A1 US2019118045 A1 US 2019118045A1
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Prior art keywords
string
friction force
cross
main
gauge
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US16/096,454
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Inventor
Katsutoshi OKI
Shinichiro CHIBA
Keisuke Ozawa
Takumi Sakaguchi
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Yonex KK
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Yonex KK
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Publication of US20190118045A1 publication Critical patent/US20190118045A1/en
Assigned to YONEX CO., LTD. reassignment YONEX CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHIBA, Shinichiro, OKI, Katsutoshi, SAKAGUCHI, TAKUMI, OZAWA, KEISUKE
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/02—Strings; String substitutes; Products applied on strings, e.g. for protection against humidity or wear
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/693—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
    • A63B2051/023—
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/04—Badminton
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/001—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings using strings made of different materials on the same frame, e.g. gut and nylon
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/002—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings using strings with different cross-sections on the same frame, e.g. with different thickness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/005—Devices for measuring the tension of strings
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/02—Strings; String substitutes; Products applied on strings, e.g. for protection against humidity or wear
    • A63B51/023—Strings having characteristics varying along the length of the string, e.g. diameter or elasticity

Definitions

  • the present invention relates to a string set, a main string, and a cross string strung on a racket.
  • a badminton racket has a main string and a cross string strung such that the main string and the cross string intersect to form a face on which a shuttlecock is hit back.
  • a string made by winding or braiding a side string around a multifilament core string and coating an outer surface For example, see Patent Document 1).
  • a string described in Patent Document 1 has improved string durability by adding a metal powder, such as titanium, in a coating agent.
  • the hairpin is a shot that lightly repels a shuttle (shuttlecock) that is dropped near a net back into an opponent's court.
  • the cut smash is a shot that uses a face of a racket to cut the shuttlecock that flies over the head so as to drop the shuttlecock near the net in the opponent's court.
  • the present invention has been made in consideration of such a point, and it is an objective of the present invention to provide a string set, a main string, and a cross string that ensure improving a hairpin performance and a cut smash performance.
  • a string set of the present invention is a string set strung on a racket as a main string and a cross string.
  • the string set includes a first string and a second string.
  • the first string is strung as any one of the main string and the cross string.
  • the first string has a small surface friction force and a small diameter.
  • the second string is strung as another one of the main string and the cross string.
  • the second string has a larger surface friction force and a larger diameter than the surface friction force and the diameter of the first string.
  • the second string has the large surface friction force and the large diameter, and thus, a friction force as well as a contacted area with a shuttlecock increases. Accordingly, a spin is easily applied to the shuttlecock repelled when a hairpin is shot, thereby improving the hairpin performance.
  • the first string has the small surface friction force and the small diameter, and thus, a friction force as well as a contacted area between the first string and the second string decreases. Accordingly, the first string and the second string easily moves relatively when a cut smash is shot, thereby improving the cut smash performance.
  • distributing functions to the first string and the second string ensures obtaining both the hairpin performance, which is improved by the large surface friction force and outer diameter of the string, and the cut smash performance, which is improved by the small surface friction force and outer diameter of the string, at the same time.
  • the first string is the cross string
  • the second string is the main string.
  • a friction force at which the second string moves with respect to the first string is 2.2 [N] or less.
  • the first string has an outer diameter that is 94% or less of an outer diameter of the second string.
  • the first string and the second string form a face of the racket, and the face has a surface friction force of 9 [N] or more.
  • the surface friction force on the face increases, and therefore, a spin is easily applied to a shuttlecock repelled on the face.
  • the second string includes a coating film, and at least a superficial layer of the coating film of the second string has a property to increase a grip force corresponding to an increase in film thickness.
  • At least the superficial layer of the coating film of the second string is formed of polyurethane or rubber.
  • a cross string of the present invention is a cross string strung on a racket while intersecting with a main string, and the cross string has a smaller surface friction force and a smaller diameter than a surface friction force and a diameter of the main string.
  • the cross string is made to have a smaller surface friction force and a smaller diameter than the surface friction force and the diameter of the main string, thereby decreasing a friction force as well as a contacted area between the strings. Accordingly, the main string easily moves with respect to the cross string when a cut smash is shot, thereby improving the cut smash performance. Even when the main string having the large surface friction force and the large diameter makes it easy to apply a spin, and thus, the hairpin performance is improved, the main string sufficiently moves with respect to the cross string, and thus, the cut smash performance is not lowered.
  • a main string of the present invention is a main string strung on a racket while intersecting with a cross string, and the main string has a larger surface friction force and a larger diameter than a surface friction force and a diameter of the cross string.
  • the main string is made to have a larger surface friction force and a larger diameter than the surface friction force and the diameter of the cross string, thereby increasing a friction force as well as a contacted area between the shuttlecock and the main string. Accordingly, a spin is easily applied to the shuttlecock repelled when a hairpin is shot, thereby improving the hairpin performance. Even when the cross string having the small surface friction force and the small diameter makes it easy for the main string to move, and thus, the cut smash performance is improved, the surface friction force of the main string is sufficiently large, and thus, the hairpin performance is not lowered.
  • using the first string having the small surface friction force and the small diameter in combination with the second string having the large surface friction force and the large diameter ensures improving the hairpin performance and the cut smash performance.
  • FIG. 1 is a front view of a racket on which a string is strung.
  • FIG. 2 includes explanatory diagrams of a hairpin performance and a cut smash performance according to a comparative example.
  • FIG. 3 includes explanatory diagrams of a hairpin performance and a cut smash performance according to an embodiment.
  • FIG. 4 is a cross-sectional schematic diagram of a string according to the embodiment.
  • FIG. 5 is a drawing showing a relation between a film thickness of polyurethane and a string gauge according to the embodiment.
  • FIG. 6 is a drawing showing a relation between a cross string gauge and a main string moving amount according to the embodiment.
  • FIG. 7 is a drawing showing a relation between the cross string gauge and a friction force when the main string moves according to the embodiment.
  • FIG. 8 is a drawing showing a relation between a friction force of the cross string and the friction force when the main string moves according to the embodiment.
  • FIG. 9 includes explanatory diagrams of a feeling of shuttlecock hitting and an edge breakage probability according to the embodiment.
  • FIG. 10 is a drawing showing a relation between the cross string gauge and a friction force when the cross string is threaded through according to the embodiment.
  • FIG. 11 is an explanatory diagram of a measuring method for a surface friction force according to the embodiment.
  • FIG. 12 is an explanatory diagram of a measuring method for a friction force when the main string moves according to the embodiment.
  • FIG. 1 is a front view of a racket on which a string is strung.
  • FIG. 2 includes explanatory diagrams of a hairpin performance and a cut smash performance according to a comparative example.
  • FIG. 3 includes explanatory diagrams of a hairpin performance and a cut smash performance according to an embodiment. It should be noted that an identical string is used for a main string and a cross string in the comparative example, and different strings are used for a main string and a cross string in the embodiment.
  • a racket 50 of badminton includes a frame 53 on which a main string 21 and a cross string 22 are strung such that the main string 21 and the cross string 22 intersect to form a face 54 on which a shuttlecock is hit back.
  • the main string 21 and the cross string 22 intersect such that relative positions of the strings are exchanged at intersecting positions. Only at these intersecting positions, the main string 21 and the cross string 22 are in contact.
  • an impact disperses on the main string 21 and the cross string 22 via the intersecting positions, and repulsion forces of the respective strings 21 and 22 repel the shuttlecock back.
  • the hairpin is a shot that uses the face 54 of the racket 50 to lightly repel the shuttlecock back to near a net in an opponent's court.
  • the shuttlecock is repelled with the face 54 of the racket 50 in an approximately horizontal, and when the shuttlecock is hit as if being scuffed, a spin is applied to the repelled shuttlecock, and thus, the shuttlecock is returned to the opponent's court along a nearly vertical trajectory.
  • the cut smash is a shot that uses the face 54 to hit the shuttlecock as if cutting the shuttlecock so as to drop the shuttlecock near the net in the opponent's court.
  • the face 54 obliquely hits the shuttlecock.
  • the main string 21 is moved by the shuttlecock, and the main string 21 gives a rotation to the shuttlecock when returning, and thus, the shuttlecock is returned to the opponent's court along a sharply dropping trajectory.
  • identical strings 41 and 42 are typically used for a main string and a cross string of a racket.
  • a spin capability when a hairpin is shot is important as a factor to determine the hairpin performance.
  • the spin is affected by a friction force between a surface of the strings 41 and 42 and a cork leather of the shuttlecock.
  • string gauges outer diameter
  • a mobility of the main string 41 is important as a factor to determine the cut smash performance.
  • the mobility of the main string 41 is affected by a friction force and a contacted area between the strings.
  • functions of the hairpin performance and the cut smash performance are distributed to the main string 21 (second string) having a large surface friction force and a large diameter and the cross string 22 (first string) having a small surface friction force and a small diameter. Then, the disadvantage caused by the increased string gauge of the main string 21 and surface friction force is improved by decreasing the string gauge of the cross string 22 and the surface friction force. Conversely, the disadvantage caused by the decreased string gauge of the cross string 22 and surface friction force is improved by increasing the string gauge of the main string 21 and the surface friction force.
  • a string set 20 of the embodiment includes the main string 21 and the cross string 22 .
  • the main string 21 has a larger surface friction force and a larger diameter than those of the cross string 22 .
  • the cross string 22 has a smaller surface friction force and a smaller diameter than those of the main string 21 . Since the main string 21 is formed into the large surface friction force and the large diameter, a friction force and a contacted area between a surface of the main string 21 and the shuttlecock increase, and thus, a spin is easily applied to the shuttlecock. Thus, using the string 21 having the large surface friction force and the large diameter for the main string ensures improving the hairpin performance even though the string 22 having the small surface friction force and the small diameter is used for the cross string.
  • a shortage of the feeling of shuttlecock hitting (repulsion) caused by the increased string gauge of the main string 21 is compensated by decreasing the string gauge of the cross string 22 .
  • the easy edge breakage caused by the decreased string gauge of the cross string 22 is compensated by increasing the string gauge of the main string 21 , which is in particular susceptible to the edge breakage.
  • the difficulty in stringing caused by the increased surface friction force of the main string 21 is compensated by decreasing the surface friction force of the cross string 22 .
  • FIG. 4 is a cross-sectional schematic diagram of the string according to the embodiment. It should be noted that a cross-sectional structure of the string according to the embodiment is not limited to the configuration illustrated in FIG. 4 , and can be changed as necessary.
  • the string 21 is configured by forming a coating film 16 around a structure 13 in a string shape formed of a core string 11 and side strings 12 a and 12 b .
  • the structure 13 in the string shape is configured by braiding the side strings 12 a and 12 b around the multifilament core string 11 .
  • the side strings 12 a and 12 b constitute one set with a plurality of side strings, and eight sets in an S direction and eight sets in a Z direction are braided so as to cover the core string 11 .
  • the cross string 22 is formed approximately similarly to the main string 21 except that a coating film is formed only of the polyamide and an outer diameter of a structure in the string shape is small. Unlike the main string 21 , the cross string 22 has a superficial layer of the coating film formed of the polyamide as well, thereby having the surface friction force smaller than that of the main string 21 . It should be noted that, while a material of the core string and the side string of the main string 21 and the cross string 22 is not limited, for example, the polyamide, polyester, and the like are used.
  • the region where a spin is easily applied expands, and it is possible to obtain the surface friction force of 9 [N] or more even when the string gauge is small.
  • the indicated gauge is the outer diameter at a tension of 25 pounds.
  • a range R 5 where the film thickness is 8 [ ⁇ m] or more is the spin region.
  • a range R 6 where the film thickness of the polyurethane is 0 [ ⁇ m] to 2 [ ⁇ m] is the spin region
  • a range R 7 where the film thickness of the polyurethane is 2 [ ⁇ m] or more is the high spin region. That is, in association with the increased string gauge, the region where a spin is easily applied expands, and it is possible to obtain the surface friction force of 9 [N] or more even when the film thickness of the polyurethane is small.
  • the film thickness of the polyurethane When the film thickness of the polyurethane is large, increasing a grip force to the shuttlecock increases the surface friction force of the string.
  • the string gauge When the string gauge is large, increasing a contacted area between the surface of the string and the cork leather of the shuttlecock increases the surface friction force of the string.
  • an appropriate friction force is given to the surface of the string.
  • the above-described string friction force is measured using Autograph AG-IS (made by SHIMADZU CORPORATION), for example, by sliding a weight having a cork leather attached on a contact surface on the string surface strung on a racket.
  • the racket 50 on which the strings 21 and 22 are longitudinally and vertically strung is placed on a horizontal table 60 , and a plate-shaped weight 32 (1 [kg]) with a cork leather 31 is placed.
  • a wire rod 33 is attached to the weight 32
  • the other end of the wire rod 33 is attached to a chuck 72 of a tension testing machine 70 (Autograph AG-IS) via a pulley 71 .
  • An elevation of the chuck 72 pulls the weight 32 on the surface of the string 21 .
  • a friction force generated between the strings 21 and 22 and the cork leather 31 is measured as a tensile force of the tension testing machine 70 . That is, the surface friction force of the string 21 is a friction force generated when the weight 32 weighing 1 [kg] with the cork leather 31 slides with respect to the strings 21 and 22 .
  • the terpene resin is a tackifying resin made by processing turpentine and an orange oil as a raw material.
  • the surface friction force of the string that used the polyamide to which the terpene resin is added was 7.6 [N] and was greater than 6.3 [N] of the surface friction force of the string that used the polyamide, but was less than 9 [N] where a spin is easily applied.
  • the surface friction forces of the strings that used the polyurethane and the rubber were 12.5 [N] and 21.4 [N], respectively, and were greater than 6.3 [N] of the surface friction force of the string that used the polyamide, and further, were equal to or more than 9 [N] where a spin is easily applied. From this, it was found that a sufficient friction force can be obtained by using the polyurethane and the rubber as the coating agent.
  • the polyurethane or the rubber is used as the material of the superficial layer of the coating film 16 . Furthermore, from the aspect of processing stability, it is more preferred to use the polyurethane.
  • the material of the superficial layer of the coating film is not limited to the above-described materials, and any materials may be used as long as the surface friction force of the string becomes 9 [N] or more.
  • the polyamide and the polyamide to which the terpene resin is added as the material of the coating film by adjusting the film thickness of the coating film 16 and a size of the string gauge to make the surface friction force of the string 9 [N] or more.
  • the polyamide may form the superficial layer.
  • FIG. 6 is a drawing showing a relation between the cross string gauge and the main string moving amount according to the embodiment.
  • FIG. 7 is a drawing showing a relation between the cross string gauge and a friction force when the main string moves according to the embodiment.
  • FIG. 8 is a drawing showing a relation between a friction force of the cross string and the friction force when the main string moves according to the embodiment.
  • the horizontal axis indicates a size of the cross string gauge and the vertical axis indicates a moving amount of the main string.
  • the horizontal axis indicates the size of the cross string gauge and the vertical axis indicates the friction force when the main string moves.
  • the horizontal axis indicates the friction force of the cross string and the vertical axis indicates the friction force when the main string moves.
  • the following describes the main string as a warp string, cross string as a weft string, the string gauge for main string as a main string gauge, and the string gauge for cross string as a cross string gauge.
  • the cut smash performance was checked by changing the cross string gauge with respect to the main string having the main string gauge of 0.67 [mm] and the film thickness of the polyurethane of 10 [ ⁇ m].
  • the main string and the cross string were strung at 25 pounds on a racket, ARC8DX (made by YONEX CO., LTD.), and then hitting was performed with a hitting angle of 30 degrees and a swinging speed of 200 [km/h] using a shooting machine.
  • the cross string gauge is 0.65 [mm]
  • the main string moving amount is approximately 5.50 [mm]
  • the cross string gauge is 0.63 [mm]
  • main string moving amount is approximately 6.00 [mm] or more. From this, it was confirmed that as the cross string gauge decreased, the main string moving amount increased, and thus, a cut smash was easily applied to the shuttlecock.
  • a 60 [cm] long main string 82 is wound to a plurality of roller pins 91 a so as to meander, one end of the main string 82 is secured to a securing pin 91 b , and the other end of the main string 82 is attached to a weight 94 of 1000 [g] via a pulley 92 .
  • a 90 [cm] long cross string 81 is wound to a plurality of roller pins 91 c so as to thread through the main string 82 , one end of the cross string 81 is attached to a hook 96 of a force gauge 97 , and the other end of the cross string 81 is attached to a weight 95 of 300 [g] via a pulley 93 .
  • the force gauge 97 is mounted to an electric slider 98 , and is slid at a tension speed of 600 [mm/min] and for a movement distance of 100 [mm]. Then, slidability is measured. That is, the friction force when the main string moves is a relative friction force generated when the cross string 81 to which the weight weighing 300 [g] is attached is slid with respect to the main string 82 to which the weight weighing 1000 [g] is attached in a state where the cross string 81 is in contact with the main string 82 at the plurality of intersecting positions 85 (fifteen positions in the embodiment).
  • a friction force when the main string moved was checked by changing the cross string gauge with respect to the main string having the main string gauge of 0.67 [mm] and the film thickness of the polyurethane of 10 [ ⁇ m].
  • the cross string gauge is 0.65 [mm]
  • a friction force when the main string moves is approximately 2.6 [N]
  • the main string is difficult to move and it is difficult to apply a cut smash.
  • the cross string gauge is 0.63 [mm] or less
  • a friction force when the main string moves is 2.2 [N] or less, and therefore, the main string is easy to move and it is easy to apply a cut smash.
  • 0.63 [mm] or less of the cross string gauge with respect to 0.67 [mm] of the main string gauge that is, cross string gauge having 94% or less of the main string gauge improved the cut smash performance.
  • a friction force when the main string moved was checked by changing a surface friction force of the cross string having the cross string gauge of 0.61 [mm] with respect to the main string having the main string gauge of 0.67 [mm] and the surface friction force of 4.3 [N].
  • the surface friction force of the cross string is 2.3 [N]
  • the friction force when the main string moves is approximately 2.8 [N]
  • the main string is difficult to move and it is difficult to apply a cut smash.
  • the friction force of the cross string is 2.0 [N] or less
  • the friction force when the main string moves is 2.2 [N] or less, and therefore, the main string is easy to move and it is easy to apply a cut smash.
  • 2.0 [N] or less of the surface friction force of the cross string with respect to 4.3 [N] of the surface friction force of the main string improved the cut smash performance.
  • FIG. 9 includes explanatory diagrams of the feeling of shuttlecock hitting and the edge breakage probability according to the embodiment.
  • FIG. 9A is the explanatory diagram of the feeling of shuttlecock hitting.
  • FIG. 9B is the explanatory diagram of the edge breakage probability.
  • feelings of shuttlecock hitting were checked by hitting the shuttlecock and comparing the feelings of shuttlecock hitting between when the main string gauge and the cross string gauge were identical and when the main string gauge was increased and the cross string gauge was decreased.
  • both the main string gauge and the cross string gauge were 0.67 [mm]
  • a repulsion of the shuttlecock decreased.
  • both the main string gauge and the cross string gauge were 0.63 [mm]
  • the repulsion of the shuttlecock increased.
  • the main string gauge and the cross string gauge are identical, the repulsion improves by decreasing both the main string gauge and the cross string gauge.
  • edge breakage probabilities were checked by hitting the shuttlecock and comparing the edge breakage probabilities between when the main string gauge and the cross string gauge were identical and when the main string gauge was increased and the cross string gauge was decreased.
  • test hitting examinations were executed by stringing the main string and the cross string at 30 to 32 pounds on a racket.
  • the edge breakage means that a string is cut off at an edge of a frame
  • the edge breakage probability means a probability of the edge breakage of the main string or the cross string strung on the racket.
  • both the main string gauge and the cross string gauge were 0.63 [mm]
  • the edge breakage probability was approximately 68%.
  • the edge breakage probability decreased down to approximately 32%.
  • Increasing the main string gauge and decreasing the cross string gauge tremendously lowers the edge breakage probability. This is considered because the edge breakage is typically more likely to occur in the main string, and the size of the main string gauge affects the edge breakage probability easier than the size of the cross string gauge affects the edge breakage probability.
  • FIG. 10 is a drawing illustrating a relation between the cross string gauge and a friction force when the cross string is threaded through according to the embodiment. It should be noted that in FIG. 10 , the horizontal axis indicates the size of the cross string gauge and the vertical axis indicates the friction force when the cross string is threaded through. It is not smooth when the friction force when the cross string is threaded through is 3.0 [N] or more, and thus, it is in a region where a difficulty in stringing is felt.
  • the string with the film thickness of the polyurethane of 0 [ ⁇ m] was evaluated as a reference (normal).
  • the film thickness of the polyurethane was 4 [ ⁇ m]
  • the film thickness of the polyurethane was 6 [ ⁇ m]
  • a spin was easily applied with the polyurethane film thicknesses of 4 [ ⁇ m] and 6 [ ⁇ m], that is, the surface friction force of 9 [N] or more (see FIG. 5 ).
  • cross strings having cross string gauges of 0.65 [mm], 0.63 [mm], 0.61 [mm], and 0.58 [mm] and a main string having a main string gauge of 0.67 [mm] and a polyurethane film thickness of 10 [ ⁇ m] were prepared, and actual test hitting evaluations of a cut smash were executed.
  • the main string and the cross string were strung at 23 pounds on a racket, NR900 (made by YONEX CO., LTD.).
  • distributing functions to the main string 21 and the cross string 22 ensures obtaining both the hairpin performance, which is improved by the large surface friction force and outer diameter of the string, and the cut smash performance, which is improved by the small surface friction force and outer diameter of the string, at the same time.
  • the present invention is not limited to the above-described embodiment, and can be variously changed to embody.
  • size, shape, direction, and the like illustrated in the attached drawings are not limited to those, and may be appropriately changed in a range that can provide the effects of the present invention.
  • present invention may be appropriately changed to embody without departing from a scope of the object of the present invention.
  • the structure 13 in the string shape is configured by braiding the side strings 12 a and 12 b around the core string 11
  • the structure 13 in the string shape may be configured only of the core string 11 . While it is configured such that the side strings 12 a and 12 b are braided around the core string 11 , it may be configured such that only one layer of the side string is wound around the core string 11 . Furthermore, two layers of the side string may be wound around and string gauges (outer diameter) of the first layer and the second layer of the side strings may be different.
  • the core string 11 and the side strings 12 a and 12 b may be configured of any of a multifilament and a monofilament, and a count is not limited.
  • the cross-sectional surface is not limited to a circular shape, and the cross-sectional surface may be polygonal (such as a pentagonal shape).
  • a hollow thread may be used for the core string 11 and the side strings 12 a and 12 b.
  • the strings 21 and 22 have a configuration of being formed of the synthetic fiber, the configuration is not limited to this.
  • the structure 13 in the string shape of the strings 21 and 22 may be formed of a natural string made of a natural fiber, such as a sheep casing and a whale's muscle.
  • the coating film of the cross string 22 may be formed in any way as long as it is possible to improve the cut smash performance by having a friction force smaller than that of the main string 21 so as to cause the main string 21 to easily move.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Woven Fabrics (AREA)
  • Stringed Musical Instruments (AREA)
  • Harvester Elements (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US16/096,454 2016-04-27 2017-02-22 String set, main string, and cross string Abandoned US20190118045A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016-089286 2016-04-27
JP2016089286A JP6812053B2 (ja) 2016-04-27 2016-04-27 ストリングセット、縦糸用のストリング及び横糸用のストリング
PCT/JP2017/006675 WO2017187742A1 (ja) 2016-04-27 2017-02-22 ストリングセット、縦糸用のストリング及び横糸用のストリング

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US20190118045A1 true US20190118045A1 (en) 2019-04-25

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US (1) US20190118045A1 (zh)
EP (1) EP3449983A4 (zh)
JP (1) JP6812053B2 (zh)
KR (1) KR102668581B1 (zh)
CN (1) CN109069907B (zh)
MY (1) MY191299A (zh)
WO (1) WO2017187742A1 (zh)

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JP7333039B2 (ja) * 2020-02-19 2023-08-24 ヨネックス株式会社 ラケット用ストリング
CN111622129B (zh) * 2020-06-08 2021-08-24 浙江万里建设工程有限公司 一种锁定锚栓及应用锁定锚栓的山崖桥台施工方法

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US4238262A (en) * 1978-07-26 1980-12-09 Fishel Clark W Applying particles and adhesive to racquet strings
US4391088A (en) * 1982-01-13 1983-07-05 United States Tennis Gut Association, Inc. String for sports rackets
US4449353A (en) * 1982-08-06 1984-05-22 United States Tennis Gut Association, Inc. Gut string for sports rackets
US4707977A (en) * 1983-04-14 1987-11-24 Cousin Freres Composite cord manufacturing method
US5090188A (en) * 1990-01-26 1992-02-25 Lin Tseng Y Ridged racquet string
US5327714A (en) * 1992-07-30 1994-07-12 Prince Manufacturing, Inc. Synthetic string for sporting application
US5536005A (en) * 1993-03-09 1996-07-16 Koff; Steven G. Means for racket to return strings to original position after ball impact
US5601762A (en) * 1993-12-14 1997-02-11 Ferrari Importing Company Method for enhancing the properties of a string used in a stringing device
US5570883A (en) * 1994-07-04 1996-11-05 Csabai; Julius S. Sport racket with string stabilization and friction coating
US5913740A (en) * 1997-07-25 1999-06-22 Miklos; Edward J. Flat beam aerodynamic tennis racquet
US6835454B1 (en) * 1999-08-24 2004-12-28 Stuart Karl Randa Fluoropolymer modification of strings for stringed sports equipment and musical instruments
US20060084532A1 (en) * 2004-10-20 2006-04-20 Chaokang Chu Strings for racquets
US20090158912A1 (en) * 2007-12-21 2009-06-25 Bruce Nesbitt Marked precoated strings and method of manufacturing same
US20110020645A1 (en) * 2008-03-17 2011-01-27 Y.G.K Co., Ltd. Fishing line of core-sheath structure comprising short fiber
US20100040878A1 (en) * 2008-08-14 2010-02-18 Van Malderen Dominique Monofilamentous string
US20100041829A1 (en) * 2008-08-14 2010-02-18 Van Malderen Dominique Polymer string
US20110136601A1 (en) * 2009-06-30 2011-06-09 Gosen Co., Ltd. Racket string and method for producing the same and racket strung with the same
US20140031150A1 (en) * 2012-07-24 2014-01-30 Wilson Sporting Goods Co. Racquet configured with fewer cross strings than main strings

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JP6812053B2 (ja) 2021-01-13
WO2017187742A1 (ja) 2017-11-02
KR20190022457A (ko) 2019-03-06
EP3449983A1 (en) 2019-03-06
JP2017196148A (ja) 2017-11-02
CN109069907A (zh) 2018-12-21
KR102668581B1 (ko) 2024-05-24
MY191299A (en) 2022-06-14
CN109069907B (zh) 2021-08-06
EP3449983A4 (en) 2020-01-22

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