Provided is an artificial feather for a shuttlecock comprising: a feather shaft part composed of a reinforcing fiber (A) including at least a carbon fiber (A1) and a polymer alloy (B); and a feather wing part supported by the feather shaft part, the artificial feather being annularly implanted in a base part of the shuttlecock. The artificial feather for a shuttlecock includes, with respect to 100 parts by weight of the total of the reinforcing fibers (A) and (B), 1-50 parts by weight of the reinforcing fiber (A) containing at least carbon fibers, and 50-99 parts by weight of the polymer alloy (B), wherein the weight average fiber length (LwA1) of the carbon fiber (A1) is 0.5-7.0 mm. Also provided is an artificial shuttlecock having excellent impact strength and flexural modulus upon water absorption.
A grip portion of a paddle for pickleball extends in an up-down direction. A head portion of the paddle is provided on an upper end side of the grip portion and forms a hitting surface for hitting a ball on each of both sides of the head portion in a thickness direction. A reinforcement portion that reinforces a connection part connecting the head portion and the grip portion is provided at the connection part. An upper end of the reinforcement portion is provided below a central position of the paddle as a whole in the up-down direction.
Provided is a shuttlecock with which straightness during flight can be improved. This shuttlecock (1) includes a base (2) located at the front and a skirt (4) provided at the rear of the base part. The skirt includes a plurality of first shaft forming parts (45) and second shaft forming parts (46) arranged in an annular configuration centered on the central axis (C) of the shuttlecock when viewed from the rear, and feather parts supported by the first shaft forming parts and second shafts and formed in a predetermined range from the rear end to the front end of the skirt. The first shaft forming parts are formed in positions that include the space between the base and the feather parts, and the second shaft forming parts are formed in positions that include the area where the feather parts are formed. The number of first shaft forming parts is less than the number of second shaft forming parts.
Provided is a shuttlecock with which it is possible to improve straight traveling properties during flight. This shuttlecock (1) comprises a base part (2) positioned on the front, and a skirt part (4) provided to the rear of the base part. The skirt part has a plurality of wing shaft portions (41) disposed in an annular shape centered on a center axis (C) of the shuttlecock as viewed from the rear, and wing portions (42) supported by the wing shaft portions and formed in a prescribed range from the rear end to the front end of the skirt part, the skirt part being formed in a shape following the side surface of a cone. The wing shaft portions include a first curved section (51) and a second curved section (52) formed at positions including a formation region of the wing portions. The first curved section and the second curved section are formed in a curved shape that gradually separates from the front end to the rear end with respect to a first virtual straight line (L1) and a second virtual straight line (L2) serving as a base line of the cone passing through the front end.
The present invention enables securing of a long effective length of a main string and a cross string. A racket frame (10) comprises a loop-shaped frame body (11). In the frame body, a plurality of holes (18) are formed, a plurality of main strings (21) are strained so as to extend in the up-down direction and be aligned in the left-right direction, and a plurality of cross strings (22) are strained so as to extend in the left-right direction and be aligned in the up-down direction through the plurality of holes on the inside of the frame body. Through a common hole (19) among the plurality of holes, one of the plurality of main strings and one of the plurality of cross strings are both inserted. An inner opening (19a) of the common hole (19) on an inner circumferential surface (11c) of the frame body is shaped such that an opening dimension in the circumferential direction of the frame body is greater compared to the opening dimension in the thickness direction of the frame body.
To improve repulsion performance when a ball is hit by a racket. Grommets each include a strip-shaped portion and a cylinder portion protruding from one surface of the strip-shaped portion. The cylinder portion includes a plurality of ribs extending along an extending direction of a central axis of a cylinder main body. The plurality of ribs is constituted of first ribs protruding from an outer peripheral surface of the cylinder main body toward both sides in the extending direction of the strip-shaped portion, and second ribs protruding from the outer peripheral surface of the cylinder main body toward both sides in a direction orthogonal to the extending direction of the strip-shaped portion. Two or more of the first ribs are formed on each of the both sides in the extending direction of the strip-shaped portion, and one or more of the second ribs are formed on each of the both sides in the direction orthogonal to the extending direction of the strip-shaped portion.
Provided is a shuttlecock that is capable of, while reducing the influence of wind on the play, traveling in the air, and softening the impact when hitting a player or a racket. A shuttlecock (1) is configured to be provided with a base part (2) and a skirt part (4) that are arranged side by side in the front-back direction. The base part has formed therein a plurality of holes (30) that are opened at least on the outer circumferential surface side. The holes are each formed so as to have a cylindrical interior surface that extends in a prescribed direction and are formed to have a length in the extension direction greater than the maximum opening width of the holes as viewed in the extension direction.
Provided is a shuttlecock that is capable of mitigating impact when caused to fly and collide with a player or racket, while suppressing the effect of wind on the play. The shuttlecock (1) comprises a base section (2) that holds a skirt section (4). The base section comprises: a holding part (24) forming an area that holds the skirt section; an outer forming part (21) forming an area to be hit by a racket; and a core forming part (22) forming an area more inward than the outer forming part. At least a portion of the core forming part is configured by a three-dimensional lattice structure.
The objective of the present invention is to make it possible to improve striking performance when using a racket to hit a ball. A grommet (25 to 28) is configured by providing a strip-shaped portion (31), and a cylinder portion (32) projecting from one surface of the strip-shaped portion. The cylinder portion is provided with a plurality of ribs (36) extending in an extension direction of a central axis (C) of a cylinder main body (35). The plurality of ribs consist of first ribs (36a) which project from an outer circumferential surface of the cylinder main body toward both sides in the extension direction of the strip-shaped portion, and second ribs (36b) which project from the outer circumferential surface of the cylinder main body toward both sides in a direction perpendicular to the extension direction of the strip-shaped portion. At least two first ribs are formed on each of the two sides in the extension direction of the strip-shaped portion, and at least one second rib is formed on each of the two sides in the direction perpendicular to the extension direction of the strip-shaped portion.
Repulsive-performance upon ball hitting with a racket is enhanced, and good feeling of ball hitting is ensured. A grommet includes a cylindrical part which is mounted pierced through a through hole formed in a frame of a racket and through which a string passes. The string is extended in a tensioned state on the frame and deflected with one end side of the cylindrical part as a deflection position. The cylindrical part includes a first formation section located on a deflection-position side with reference to a central axis position of an outer peripheral face of the cylindrical part and a second formation section located on an opposite side of the central axis position from the first formation section. The first formation section has a greater thickness than the second formation section in a radial direction of the cylindrical part.
The present invention achieves fine gripping performance with respect to a ground contact surface. This sports shoe (1) is provided with an out sole (10) that makes contact with a ground contact surface (G). The out sole is provided with a plurality of protrusions (20) that protrude downward from an under surface thereof and that are arranged side by side in the foot breadth direction and the front-back direction, which intersect with each other. Each of the protrusions comprises: a center part forming section (21); a pair of first outer-side forming sections (23) that protrude toward both sides in the foot breadth direction from the center forming section (21); and a pair of second outer-side forming sections (24) that protrude toward both sides in the front-back direction from the center forming section (21). Each of the first outer-side forming sections is located adjacent to, in the front-back direction, a first outer-side forming section of another protrusion disposed adjacent thereto in the foot breadth direction. Each of the second outer-side forming sections is located adjacent to, in the foot breadth direction, a second outer-side forming section of another protrusion disposed adjacent thereto in the front-back direction.
Structures with racket performance varied according to the configurations of cylindrical parts can be easily used. A grommet (25-28) includes a cylindrical part (32) which is mounted pierced through a through hole (23) formed in a frame (20) of a racket (10) and through which a string (21) passes. The string is extended in a tensioned state on the frame so as to form front and back faces as hitting faces (22). The cylindrical part includes a first formation section (35) forming both sides of a central axis position (C) of the cylindrical part and a second formation section (36) rotationally shifted with reference to the central axis position by 90 degrees relative to the first formation section and forming both sides of the central axis position. One of the first and second formation sections is disposed on both sides in a front/back direction. The first and second formation sections each have a different rigidity.
Provided is a racket string having a string-making structure for side threads, the racket string being capable of being easily manufactured and exerting a plurality of functions with a single string. A string (10) includes a core thread (11), a plurality of Z-winding-side threads (12a) wound in a Z-direction on the outer peripheral side of the core thread, and a plurality of S-winding-side threads (12b) wound in an S-direction on the outer peripheral side of the core thread, and extends in a predetermined direction. The Z-winding-side threads and the S-winding-side threads are woven into a string-making structure. Long core members (13) are incorporated so as to extend on the outside of the core thread.
Provided is a badminton racket wherein, when a shaft thereof breaks, separation at the position of the break can be avoided. A racket (10) according to the present invention comprises: a frame (13) that extends in a ring shape; a grip (11); and a shaft (12) that links the frame and the grip. The shaft comprises an innermost layer (21) and a shaft-forming layer (22) stacked to the outside of the innermost layer. The shaft is formed by overlapping and wrapping a plurality of sheets (S) of fibrous reinforcing material impregnated with resin. The plurality of sheets comprises an innermost layer sheet (S01) that forms the innermost layer, and shaft-forming sheets (S11–S13) which form the shaft-forming layer and in which the reinforcing material is carbon fibers. The reinforcing material in the innermost layer sheet is ultra-high-density polymer fibers.
The objective of the present invention is to enable resilience when hitting a ball to be improved while providing satisfactory strength. A racket string (10) extending in a prescribed direction is configured to be provided with a core thread (11), and a plurality of side threads (12) provided on the outer circumferential side of the core thread. The core thread is provided with elastic fibers (18) in a region including a central axis position (C). The elastic fibers are provided in such a way as to extend parallel to the direction in which the string extends. The elastic fibers are therefore provided without being twisted, the elastic fibers are arranged in a straight line in a state in which the string has been stretched, and can thus satisfactorily exhibit an elastic force in the expanding and contracting direction, and the resilience when hitting a ball can be improved by means of said elastic force.
The purpose of the present invention is to make it possible to easily adopt a design in which the performance of a racket is changed according to the structure of a cylindrical part. A grommet (25-28) is configured from a cylindrical part (32) which is attached so as to traverse a through hole (23) formed in a frame (20) of a racket (10) and which has a string (21) passing therethrough. The string is provided in the frame in a tensioned state and constitutes the front and back surfaces serving as ball hitting surfaces (22). The cylindrical part comprises: first formation parts (35) that constitute both sides about the center axis position (C); and second formation parts (36) that constitute both sides about the center axis position, rotated around the center axis position by 90 degrees from the first formation parts. The first formation parts or the second formation parts are provided on both sides in the front-back direction. The first formation parts and the second formation parts have different rigidity.
The present invention improves ball flight performance when a ball is hit by a racket and attains a preferable ball-hitting feel. Grommets (25-28) are configured to be provided with cylindrical parts (32) which are fitted in and pass through through-holes (23) formed in the frame (20) of a racket (10) and through which a string (21) passes. When being tensioned on the frame, the string is folded back at a fold-back position (F) located at a one-end-side of each of the cylindrical parts. The cylindrical parts are each provided with: a first forming portion (35) that is positioned on the fold-back position side with respect to the central axis position (Cb) of the outer circumferential surface of the cylindrical part; and a second forming portion (36) that is positioned on the side opposite to the first forming portion across the central axis position. The first forming portion is formed to have a greater thickness in the radial direction of the cylindrical part than the second forming portion.
The purpose of the present invention is to increase the degree of freedom of adjusting weight or a balance point. A racket (10) according to the present invention is provided with: a frame (13) extending in an annular shape; a grip (11); and a shaft (12) for connecting the frame and the grip. A shaft body (22), which is a section of the shaft other than a section connected to the frame, has hollow regions (23, 24) in portions thereof in the extension direction, and has a solid region (25) in the remaining portion. By modifying the length or position of the hollow regions and the solid region in the extension direction of the shaft body, the overall weight and the balance point of the racket can be adjusted.
The purpose of the present invention is to reduce the diameter of a shaft while maintaining sufficient strength in the shaft. A racket (10) according to the present invention is provided with: a frame (13) extending in an annular shape; a grip (11); and a shaft (12) for connecting the frame and the grip. The shaft is formed as a solid by a fiber reinforced resin. The shaft is formed in an approximately circular shape when viewed in a cross-section perpendicular to the extension direction, and the dimension of the diameter thereof is set to be 5.7-6.2 mm.
To enhance a resilience performance of a ball at hitting the ball, a grommet is configured to include a strip-shaped portion extending in a predetermined direction and a cylindrical portion projecting from one surface of the strip-shaped portion, the cylindrical portion being a portion through which a string passes. A bulge portion is formed on a part on another surface of the strip-shaped portion, the part being along an inner periphery of the cylindrical portion. The bulge portion has a shape bulged more than the other surface of the strip-shaped portion, and the string is folded back at the bulge portion. A plurality of the protrusions are formed between the cylindrical portions adjacent to one another, the plurality of the protrusions being portions to which the string contacts.
The purpose of the present invention is to prolong the time of contact between a ball and string at the time of hitting the ball. This racket (10) is provided with: a frame (15) across which string is stretched to form a ball hitting face; and a shaft (13) formed between the frame and a grip (12). A joint part (24) for joining the frame and the shaft is formed therebetween. An opening (25) is formed so as to be surrounded by the frame and the shaft, and a region adjacent to the opening is defined as an opening-forming region (26). The joint part has formed therein holes (17) through which string is passed, and also has recessed parts (30) formed at positions which are situated away from the holes and the opening-forming region, and which are on both sides across the thickness-direction center position.
The objective of the present invention is to enable a ball striking sensation and ball striking performance to be stabilized, and to enable stretched strings to maintain a satisfactory external appearance. A racket (10) is configured by providing a frame (20) on which strings (21) are stretched in longitudinal and lateral directions to form a ball striking surface. A plurality of insertion passages (33) through which the strings are inserted are formed in the frame. The insertion passages through which the strings are inserted at both sides in the lateral direction are formed in asymmetrical locations with respect to the longitudinal direction, serving as the position of the axis of symmetry, and are formed in such a way that an angle of inclination of the strings stretched between the insertion passages relative to the lateral direction is at least equal to 0° and at most equal to 0.2°. Further, the insertion passages through which the strings are inserted at both sides in the longitudinal direction are formed in asymmetrical locations with respect to the lateral direction, serving as the position of the axis of symmetry, and are formed in such a way that an angle of inclination of the strings stretched between the insertion passages relative to the longitudinal direction is at least equal to 0° and at most equal to 0.2°.
Provided is a shaft or frame of a badminton racket, a tennis racket, or a bicycle, or a shaft of a golf club or snowboard, the shaft and the frame being able to maintain strength and increase flexibility. A shaft 12 is provided with: a cylindrical inner layer 15; and at least one coating layer 16 layered around an axis X on the outer side of the inner layer 15 so as to be concentric with the inner layer 15. The shaft 12 is characterized by being a carbon fiber-reinforced molded article in which at least one layer of the inner layer 15 and the coating layer 16 includes a composite material and a resin cured product that are arranged in the at least one layer. The shaft 12 is characterized in that the composite material has: a carbon fiber bundle in which a plurality of continuous carbon fibers are arranged; and carbon nanotubes attached to the surfaces of the carbon fibers.
A63C 5/12 - Skis ou surfs des neiges leur fabricationSélection de matériaux particuliers
B29C 70/16 - Façonnage de matières composites, c.-à-d. de matières plastiques comprenant des renforcements, des matières de remplissage ou des parties préformées, p. ex. des inserts comprenant uniquement des renforcements, p. ex. matières plastiques auto-renforçantes des renforcements fibreux uniquement caractérisées par la structure des renforcements fibreux utilisant des fibres de grande longueur, ou des fibres continues
B62K 19/16 - Cadres de cycle caractérisés par le matériau ou la section transversale des éléments du cadre le matériau étant entièrement ou principalement en plastique
Provided is a string set allowing improvement in hairpin shot and cut shot performances. This string set (20) is for stringing rackets as warp and weft strings and includes a first string (22) having a small diameter and a low frictional force to be strung as either a warp string or a weft string; and a second string (21) having a large diameter and a frictional force higher than that of the first string to be strung as the other one of the warp string and the weft string. Functions are thus distributed between the first string and the second string to achieve both the hairpin shot performance which is improved by a high surface frictional force and a large outside diameter of the string and the cut shot performance which is improved by a low surface frictional force and a small outside diameter.
Provided is a racket string which improves spin performance. The racket string (10) comprises a filamentous structure (13), and a coating film (16) formed around the filamentous structure, wherein the coating film has a surface frictional force of not less than 9 [N]. In this way, the surface frictional force of the racket string is increased, thereby making it easier to apply spin when a shuttlecock is hit by the racket string.
In order to combine the advantages of a twin-tip shape and a directional shape, a snowboard having a stance center (C2) more toward the tail with respect to the entire length of the board is provided with: a plate-like core material extending across the entire length of the board; and a sheet-like reinforcing material (15) laminated on a plate surface of the core material. Carbon fiber having a small specific gravity and glass fiber having a large specific gravity are used for an area (A1) forward from the stance center of the reinforcing material, and glass fiber is used for an area (A2) rearward from the stance center of the reinforcing material.
The objective of the present invention is to make it possible to increase rebound performance of a ball when hit. A grommet (26) is configured by providing a strip-shaped portion (31) which extends in a prescribed direction, and tube portions (32) which protrude from one surface of the strip-shaped portion and through which strings (21) pass. Bulging portions (41) are formed on the other surface of the strip-shaped portion, in parts thereof that run along the inner circumference of the tube portions. Each bulging portion is formed with a shape that bulges from said other surface of the strip-shaped portion, and the strings are folded back at the bulging portions. A plurality of protruding portions (42) with which the strings come into contact are formed between adjacent tube portions.
The present invention is configured so that an advantage can be obtained by forming a hollow section and durability can be increased. A racquet string (10) is configured provided with a core yarn (11) and a plurality of side yarns (12) wrapped on the outer peripheral side of the core yarn. The core yarn is provided with a solid-core section (20) formed in a prescribed region including a center axis position (C), and a plurality of hollow sections (21) formed around the solid-core section and extending in the extension direction of the core yarn. An odd number of hollow sections are formed, and the hollow sections are disposed at equal angles with the solid-core section as a center.
The present invention makes it possible to easily obtain different performance in the front side and rear side of a ball hitting surface. This racket (10) is provided with: a frame (13) that extends in an annular shape; a grip (11); and strings (14) that are stretched across the frame and form a ball hitting surface (15) on the front and rear surfaces. In a cross-sectional view of the frame in a plane that is orthogonal to the direction of extension thereof, a front surface portion (20) and rear surface portion (21) are formed so as to be asymmetrical. Employing such an asymmetrical shape makes it possible to vary, between the front surface and rear surface of the ball hitting surface, the striking performance when a shuttlecock is struck, and makes it possible to obtain two different types of performance in a single racket just by holding the grip differently.
The present invention makes it possible to easily reveal different designs in a single racket. This racket (10) is provided with: a frame (13) that extends in an annular shape; a grip (11); and strings (14) that are stretched across the frame and form a ball hitting surface (15) on the front and rear surfaces. The frame and a shaft are provided with a first colored portion (41) and a second colored portion (42). When seen at a prescribed angle that is not parallel and not orthogonal to the ball hitting surface, the first colored portion can be seen and the second colored portion is hidden. When the ball hitting surface is inverted from this state, the second colored portion can be seen and the first colored portion is hidden.
brevets
