Patent classifications
A63B49/03
RACKET
A racket 2 includes a frame 4, a grip 6, a grommet 10, and a string 12. The frame 4 includes a head 14, a first throat 16a, a second throat 16b, and a shaft 18. A maximum value of a thickness of the frame 4 is less than 26.0 mm. The racket 2 has an in-plane stiffness index Gi of greater than or equal to 5000 and less than or equal to 8000. The in-plane stiffness index Gi is a product of a top pressure stiffness value Git (kgf/cm) and a side pressure stiffness value Gis (kgf/cm). The racket 2 has an out-of-plane stiffness index Go of greater than or equal to 45000 and less than or equal to 60000. The out-of-plane stiffness index Go is a product of a throat stiffness value Gos (kgf/cm) and a ball-hitting face stiffness value Goh (kgf/cm).
RACKET
A racket 2 includes a frame 4, a grip 6, a grommet 10, and a string 12. The frame 4 includes a head 14, a first throat 16a, a second throat 16b, and a shaft 18. A maximum value of a thickness of the frame 4 is less than 26.0 mm. The racket 2 has an in-plane stiffness index Gi of greater than or equal to 5000 and less than or equal to 8000. The in-plane stiffness index Gi is a product of a top pressure stiffness value Git (kgf/cm) and a side pressure stiffness value Gis (kgf/cm). The racket 2 has an out-of-plane stiffness index Go of greater than or equal to 45000 and less than or equal to 60000. The out-of-plane stiffness index Go is a product of a throat stiffness value Gos (kgf/cm) and a ball-hitting face stiffness value Goh (kgf/cm).
DOUBLE GRIP TENNIS RACQUET
A double grip tennis racquet includes a generally oval-shaped racquet head, a throat that extends downward from the bottom end of the racquet head, a handle that is positioned along the bottom of the throat, a pair of struts that extend diagonally outward from the bottom of the handle, and a pair of grips that extend downward from the struts. The struts position each of the grips parallel both to each other, and to the centerline of the racquet. Each of the grips include a layered construction having a core layer that is formed as a unitary member with the struts, the handle, throat and racquet head, and an impact absorbing outer layer. Each of the grips include a separation distance of 3 inches and a length of 8 inches. The overall length of the racquet is 29 inches to conform to ITF standards.
DOUBLE GRIP TENNIS RACQUET
A double grip tennis racquet includes a generally oval-shaped racquet head, a throat that extends downward from the bottom end of the racquet head, a handle that is positioned along the bottom of the throat, a pair of struts that extend diagonally outward from the bottom of the handle, and a pair of grips that extend downward from the struts. The struts position each of the grips parallel both to each other, and to the centerline of the racquet. Each of the grips include a layered construction having a core layer that is formed as a unitary member with the struts, the handle, throat and racquet head, and an impact absorbing outer layer. Each of the grips include a separation distance of 3 inches and a length of 8 inches. The overall length of the racquet is 29 inches to conform to ITF standards.
Racquet configured with increased lateral flexibility with respect to a longitudinal axis
A racquet including a frame including a head portion, a handle portion, and a throat portion. The head portion forms a hoop that defines a string bed plane. The head portion of the racquet being formed of a fiber composite material. When the racquet is tested under the racquet lateral bending test, the racquet has a lateral deflection of at least 6.5 mm when measured in a first direction that is parallel to the string bed plane and perpendicular to the longitudinal axis. When the racquet is tested under a racquet forward/rearward bending test, the racquet has a forward/rearward deflection with respect to the longitudinal axis of less than 7.3 mm when measured in a direction that is perpendicular to the string bed plane and perpendicular to the longitudinal axis.