Abstract: In order to provide an athletic shoe that does not get caught even when a strong effort to hold on is made when sliding sideways, and that allows for light footwork, the present invention provides an athletic shoe that has an undersurface of a midsole 22 that is formed with a raised portion 24, along a circumferential side edge thereof affixed with an outersole 30 that forms an outsole, and an extending portion 32 that extends up to a circumferential side surface of the midsole is formed at a perimeter edge of the outersole, wherein: at a portion along a little toe of the circumferential side surface 22a of the midsole, a bulged portion 29 having a thickness equal to or more than a thickness substantially corresponding to a thickness of the raised portion 24 of the midsole in a shoe width direction is integrally fanned so as to protrude outward, and the extending portion 32 is formed extending from the perimeter edge of the outersole 30 toward a protruding surface of the bulged portion 29 and the extending po

Abstract: A badminton racket that is strong in respect to impact and twist and that is high in surface stability and a manufacturing method of the badminton racket is provided. A badminton racket includes a frame formed circularly, a shaft joined to the frame, a joint installed reaching inside the frame and the shaft at a joint portion of the frame and the shaft, and an expandable resin placed between the joint and the frame. A badminton racket manufacturing method includes an expandable resin placing process that places an expandable resin that expands when heated on an outer periphery of a portion of a joint, the joint being to be installed to reach inside a frame formed with the resin sheet tube and inside a shaft, the portion being to be installed in the frame.

Abstract: A golf club head has a face plate of high strength and high resilience and which provides excellent directional stability of the ball trajectory. The golf club head comprises a thick-walled portion 3 at the center of the face plate 2, and at least four narrow ribs 4a and 4b. Each of the ribs is formed with a thickness not substantially exceeding the thickness of the thick-walled portion, and extends radially from the thick-walled portion toward the perimeter of the face plate. Thin-walled portions 5 are formed between the thick-walled portion and the narrow ribs.

Abstract: An iron golf club head includes a head body and a front face plate made of a highly resilient metal which is attached to a front of the head body. A thick-walled portion is formed in the back of the lower central part of the front face plate. Multiple narrow ribs are formed to radially extend from the thick-walled portion toward the upper and lateral peripheral parts of the front face plate, and the ribs have a thickness not substantially exceeding the thickness of the thick-walled portion. Broad thin-walled portions arc formed between the adjacent ribs.

Abstract: A tennis racket comprises a frame; a shaft connected to the frame at one end thereof; a grip into which the shaft is inserted at the other end thereof; and a pair of lightweight metal pieces attached to the shaft. The frame and the shaft are formed from fiber-reinforced synthetic resin, the pair of lightweight metal pieces has a U-shaped section and extends from inside the grip at a connecting portion with the shaft and along both sides of the shaft.

Abstract: A racket which is capable of mitigating the shock transmitted to the handle, improving the stability of the face of the head-frame, and enhancing the ability to damp the vibration imparted to the frame upon impact is disclosed. The racket has two meshed pieces (5) integrally attached to the surface of each of the lateral sides of a head-frame (1) so that the meshed pieces (5) are opposed to each other across the sweet spot of the racket. The meshed piece (5) is made from titanium and has a predetermined shape.

Abstract: A golf club head of simple structure is provided, in which tungsten balance weights can be fixed to a titanium sole plate with a sufficient bonding strength. A golf club head 2 includes a hollow shell made of titanium or titanium alloy. The shell has a main body 4, a sole plate 6 and a face plate 8 which are integrally welded. Balance weight members 10 made of tungsten are provided on the sole plate 6 as press-fitted into holes 12 arranged between the toe side 6a and the heel side 6b of the sole plate 6. The balance weight 10 is a disk-like shape and integrally has a flange 10a extending radially at an upper end thereof. The flange 10a provided at an upper end of each balance weight member 10 abuts to the inner surface of the sole plate 6. Also, there is provided a metal plate 14 which covers and abuts the upper portions of the balance weights 10.

Abstract: An iron golf club head comprised of a head body 10 made of light metal such as titanium and containing a plurality of weight members 16. The head body 10 includes a front surface 13, a rear surface 13a, a cavity 12 disposed at the rear surface 13a, and a plurality of holes 15 disposed in the head body 10 at the rear surface 13a between a lower side wall 12b of the cavity 12 and a sole 14 of the head body 10 at predetermined intervals between a toe part 17 and a heel part 18. The center axis of each hole 15 is oriented substantially parallel to the sole 14 of the head body 10. The weight members 16 are press-inserted into the holes 15 in a direction going toward the front surface 13 of the head body 10 to a predetermined depth. Each weight member 16 is made of a material having a heavier specific weight than the light metal used for the aforesaid head body 10. Tungsten or tungsten alloy can be used as the material for the weight members 16.

Abstract: In a tennis racket having a frame portion and a shaft portion formed integrally with the frame portion of a fiber-reinforced plastic, the shaft portion has in a direction perpendicular to a striking area a minimum thickness (T2) at a longitudinally intermediate part thereof, the minimum thickness (T2) being between 60% and 80% of the thickness (T1) at the lower end of the shaft portion, while the frame portion has in the same direction a maximum thickness (T3) at the side portions thereof corresponding to a striking sweet spot and a minimum thickness (T4) at the top thereof, the maximum thickness (T3) being between 110% and 140% of the thickness (T1) and being between 135% and 160% of the minimum thickness (T4), whereby a time elapsed until the shaft portion reaches an initial maximum amplitude value when vibrating in the ball striking direction at an impact of a ball is approximated to a time elapsed until the side portions of the frame portion reach an initial maximum amplitude value when vibrating toward t

Abstract: In a tennis racket whose frame and handle shaft are integrally made of fiber reinforced plastics and the frame defines a strung surface, the frame is so designed that its first thickness "t" in a direction of the strung surface is substantially uniform around the circumference of the frame and its second thickness "T" in a direction perpendicular to the strung surface is gradually varied. The second thickness is maximum at side sections of the frame interposing a sweet spot in the strung surface and is minimum at the top and bottom portions of the frame in such a manner that the maximum thickness is thicker in the range from 35% to 60% than the minimum thickness, which increases a weight per unit length of the frame toward the side sections.

Abstract: A golf club head includes a sole formed of metal material such as soft iron, stainless steel, and the like; a hosel for receiving a shaft therein and formed of metal material integrally with the sole; a filler member having a specific gravity of 5 to 7 and formed by mixing fiber reinforced resin material with weighty material, the filler member having a substantially triangular shape in cross section and secured to the sole; and a fiber reinforced resin layer having a substantially inverted V shape in cross section, the layer being fitted over and enclosing the filler member, and lower marginal edges of the layer being substantially flush with upper edges of the sole.

Abstract: A golf club head includes a sole of metal material, an inner head member integral with the sole and having a substantially triangular shape in cross section, a hosel for receiving a shaft, and an outer head member formed of carbon fiber reinforced resin material and having a substantially inverted V-shaped cross-sectional configuration covering the entirety of the inner head member. Lower ends of the outer head member are in close contact with shoulders formed between the sole and the lower end of the inner head member, and marginal edges of such lower ends are flush with the sole. The joint between the inner and outer head members is strengthened by elements formed on the outer surface of the inner head member.

Abstract: A golf club head includes a sole of metal material and having a rib on the upper surface thereof, the rib extending from a heel portion to a toe portion along the longitudinal direction of the sole. A hitting portion formed of carbon fiber reinforced resin material and having a substantially triangular shape in cross section is mounted on the sole and fixed thereto with the rib being fitted within the hitting portion. The hitting portion occupies an area of from 70 to 85% of the total area of the cross section of the head body substantially at the longitudinal center thereof. A hosel for receiving a shaft therein is integrally connected to the sole at the heel portion.

Abstract: A golf club head includes a core formed integrally with a sole of the head and extending upwardly therefrom in a triangular cross section. The core is formed of metal, such as soft iron or stainless steel. A covering over the entire core and tubular shaft receiving hosel, made integral with the covering, are made from a fiber reinforced resin consisting principally of carbon fiber to form a clubface and hosel of the same material. The lower marginal edge of the clubface is formed flush with the sole.

Abstract: A badminton racket comprises a tubular shaft and an oval shaped frame internally connected to the shaft by a T-shaped joint including a pair of horizontal extensions and a vertical extension. The frame has opposite end portions with opened end faces, each of which is recessed at the lower side thereof in a semi-circular shape, and abutted against each other except at the recessed portions. The horizontal extensions of the joint are fitted in the end portions of the frame while the vertical extension is fitted in the upper end of the shaft. The junction area of the racket is coated with FRP layers to provide external connection.

Abstract: A golf club head includes a core formed integrally with a sole of the head and extending upwardly therefrom in a triangular cross section. The core is formed of metal, such as soft iron or stainless steel. At least the front of the core is covered with fiber reinforced resin consisting principally of carbon fiber to form a clubface. The lower marginal edge of the clubface is formed flush with the sole.