Title:
RACKET FRAME
Document Type and Number:
Japanese Patent JP2005065842
Kind Code:
A
Abstract:
To provide a racket frame for the tennis which is made higher in durability and resilience while securing the ideal durability with a lighter weight.
In the racket frame 10 comprising a sleeve for the tennis made of a fiber-reinforced resin, the weight without the string is 180g to 270g. The secondary natural frequency (F1) in the in-plane direction of the frame without the spreading of the string is 200Hz to 320Hz. The secondary natural frequency (F2) in the out-of-plane direction is 480Hz to 650Hz while the ratio F1/F2 is set at 0.3 to 0.6.
Inventors:
TAKEUCHI HIROYUKI
NIWA KUNIO
ASHINO TAKESHI
NIWA KUNIO
ASHINO TAKESHI
Application Number:
JP2003297540A
Publication Date:
March 17, 2005
Filing Date:
August 21, 2003
Export Citation:
Assignee:
SUMITOMO RUBBER IND
International Classes:
A63B49/10; A63B60/54; A63B102/02; (IPC1-7): A63B49/10
Attorney, Agent or Firm:
Kazumi Owada