Tennis racket frame
AssigneeDunlop Sports Co. Ltd.
InventorYosuke Yamamoto
Life of this patent
Estimating the term…
Abstract
A racket frame has an inner thick part (28) having an outer surface (12), an inner surface (14) and a pair of middle surfaces (16) each positioned between the outer surface (12) and the inner surface (14). A thickness (Ti) of the inner surface (14) is greater than a thickness (To) of the outer surface (12). A thickness of the inner thick part (28) gradually increases toward the inside. Consequently, the middle surface (16) is inclined with respect to an X direction. A distance (Ld) between an outer end and an inner end in a thickness direction of the middle surface (16) is equal to or greater than 0.5 mm.
Claims12
A tennis racket frame formed of a pipe having an outer surface, an inner surface, and a pair of middle surfaces each disposed between the outer surface and the inner surface, the tennis racket frame comprising:
- an inner thick part in which the middle surfaces are inclined with respect to a ball hitting surface such that a thickness of the pipe is gradually increased inward;
- an outer thick part in which the middle surfaces are inclined with respect to the ball hitting surface such that the thickness of the pipe is gradually increased outward, and
- a uniform thickness part in which the middle surfaces are parallel to the ball hitting surface.
A tennis racket frame formed of a pipe having an outer surface, an inner surface, and a pair of middle surfaces each disposed between the outer surface and the inner surface,
- wherein the tennis racket frame is divided into a top section, a grip-side section, and a central section disposed between the top section and the grip-side section, the central section has an inner thick part, and
- in the inner thick part, the middle surfaces are inclined with respect to a ball hitting surface such that a thickness of the pipe is gradually increased inward the grip-side section has a uniform thickness part, and in the uniform thickness part, the middle surfaces are parallel to the ball hitting surface.
Dependencies are inferred from the claim text.