Title:
ラケットフレーム
Document Type and Number:
Japanese Patent JP4173325
Kind Code:
B2
Abstract:
The racket frame incorporates a portion (16) that is designed to accelerate shape restitution; it comprises an intermediate element (19) with a hole for a string, fitted between two hollow tubular frame members (17, 18). The thickness (T1) of the tubular frame members and the thickness (T2) of the intermediate element are in a ratio where T2/T1 is below 1. The minimal distance (W1) between the tubular frame members and the distance (W2) between the outer edges of the intermediate element are in a ratio where W1/W2 is less than 1. The intermediate element can be made from a resin, optionally fibre-reinforced, metal or composition material, and has viscoelastic elements (20) between it and the frame members.
Inventors:
Takeshi Ashino
Kunio Niwa
Kunio Niwa
Application Number:
JP2002191065A
Publication Date:
October 29, 2008
Filing Date:
June 28, 2002
Export Citation:
Assignee:
sri sports corporation
International Classes:
A63B49/10; A63B49/00; A63B49/02; A63B60/02; A63B60/54; A63B102/02
Domestic Patent References:
| JP9038241A | ||||
| JP8107951A | ||||
| JP6238015A | ||||
| JP63309284A | ||||
| JP2002035170A | ||||
| JP2002191723A |
Attorney, Agent or Firm:
Kazumi Owada
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