Patent ID: 8206248
Filing Date: 2012-06-26
Classification: A63B

Abstract:
1. A tennis racket comprising: a frame that includes a shaft and a looped frame portion, the shaft having a grip formed on one end side thereof, the frame portion being joined to the other end side of the shaft and forming a hitting face with a string being strung across; and a plurality of insertion holes that provide communication between an inner peripheral side surface and an outer peripheral side surface of the frame portion and through which the string is inserted, shock absorbing portions and hard portions being provided in an alternating fashion on at least a part of the outer peripheral side surface of the frame portion, each shock absorbing portion being formed between insertion holes that are adjacent to each other, each hard portion being formed between insertion holes that are adjacent to each other and being less elastically deformable than the shock absorbing portion, wherein the string is strung across by being guided from an inner side of the looped frame portion via the insertion hole to an outer side of the looped frame portion, flexed back and then guided to the inner side via another insertion hole, wherein a first coefficient of restitution is provided when the string is flexed back at the shock absorbing portion of the frame portion, and wherein a second coefficient of restitution is provided when the string is flexed back at the hard portion.