Invention Grant
- Patent Title: Racket with reduced yoke rigidity
- Patent Title (中): 具有减小轭刚度的球拍
-
Application No.: US10188074Application Date: 2002-07-03
-
Publication No.: US06688997B2Publication Date: 2004-02-10
- Inventor: Takeshi Ashino , Kunio Niwa , Hiroyuki Takeuchi
- Applicant: Takeshi Ashino , Kunio Niwa , Hiroyuki Takeuchi
- Priority: JP2001-258612 20010828
- Main IPC: A63B4900
- IPC: A63B4900

Abstract:
A racket frame (1) has a pipe-shaped racket-frame body (2) made of a fiber reinforced resin and composed of a head (3), a throat part (4), a shaft part (5), and a grip part (6) sequentially arranged and a yoke (10) connected to the racket-frame body (2). In this construction, supposing that the head (3) is a clock face and that the top position of the head (3) is 12 o'clock, a yoke rigidity value at a central position P1, vertical to a ball-hitting face (F), of the yoke (10) in a longitudinal direction thereof is in a range of 10% to 70% of a face rigidity value which is an average of a rigidity value at a 12 o'clock position (P2) vertical to the ball-hitting face (F) and a rigidity value at a three o'clock position (P3) vertical to the ball-hitting face (F).
Public/Granted literature
- US20030064838A1 Racket frame Public/Granted day:2003-04-03
Information query