Title:
RACKET FRAME
Document Type and Number:
Japanese Patent JP3742905
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a racket frame which is excellent in attenuation ability to vibration under normal conditions of use for a string used.
SOLUTION: There are provided a head part including a yoke part 11, two throat parts, a shaft part and a grip part on a racket frame. An vibration attenuation material 21 and the first protective material 13 are installed on the yoke part 11. There are provided a band 23 and a cylinder 25 on the vibration attenuation material 21. There are provided a hard band 27 and a hard cylinder 29 on the first protective member 13. The cylinder 25 and the head cylinder 29 are inserted in string ports which are punched on the yoke part 11. Dynamic viscoelastic loss factor tanδ which is measured in a condition of which frequency of the vibration attenuation material 21 is 10 Hz and temperature of the same is -5°C is over 0.3% and below 2.3%.
Inventors:
Kunio Niwa
Application Number:
JP2000123246A
Publication Date:
February 08, 2006
Filing Date:
July 29, 1999
Export Citation:
Assignee:
sri sports corporation
International Classes:
A63B49/02; A63B49/00; A63B49/022; A63B60/02; A63B60/54; A63B102/02; A63B102/04; (IPC1-7): A63B49/02; A63B49/04
Domestic Patent References:
| JP415235Y2 | ||||
| JP1185271A | ||||
| JP625369A |
Attorney, Agent or Firm:
Kazumi Owada