Title:
RACKET FRAME
Document Type and Number:
Japanese Patent JP2003038685
Kind Code:
A
Abstract:
To provide a racket frame for a beginner capable of demonstrating excellent repulsion performance and surface stability in hitting a ball even while securing a large sweet spot area.
While the out-of plane primary natural bending frequency (F1) of a shaft-grip part 8 is set within the range of 1,500 Hz-2,000 Hz, the ratio (F1/F2) of the out-of-plane primary natural bending frequency (F1) to the out-of- plane primary natural bending frequency (F2) of a ball hitting part 4 is set within the range of 3.9-4.8. Also, the ratio (F2/F3) of the out-of-plane primary natural bending frequency (F2) of the ball hitting part 4 to the out-of-plane primary torsional frequency (F3) of the ball hitting part 4 is set within the range of 1.0-1.3.
Inventors:
NAGAO YASUSHI
KOZUKA AKIHIRO
KANAMORI KATSUJI
KOZUKA AKIHIRO
KANAMORI KATSUJI
Application Number:
JP2001236177A
Publication Date:
February 12, 2003
Filing Date:
August 03, 2001
Export Citation:
Assignee:
MIZUNO KK
International Classes:
A63B49/10; A63B49/02; A63B102/02; (IPC1-7): A63B49/02; A63B49/10