Unlock instant, AI-driven research and patent intelligence for your innovation.

Racket frame and racket

a racket and racket technology, applied in the field of racket frames and rackets, can solve the problems of ineffective increase of sweet area, difficult to obtain outstanding sweet, and increase of effective so as to increase the effective length of string, increase the sweet area, and improve the effect of restitution performan

Inactive Publication Date: 2008-01-17
DUNLOP SPORTS CO LTD
View PDF19 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The present invention has been made in the above-described problem. Therefore it is an object of the present invention to provide a racket frame capable of securely and outstandingly displaying the effect of an increase of the sweet area owing to an increase of the effective length of a string; and a racket including the racket frame.

Problems solved by technology

This construction does not contribute to an increase of the effective length of the string and is thus incapable of increasing the sweet area effectively.
It is difficult to obtain an outstanding sweet area-increasing effect if the ratio of the total number of the strings having an increased effective length to the total number of all strings is very low.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Racket frame and racket
  • Racket frame and racket
  • Racket frame and racket

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102]The racket frame had the same construction as that of the racket frame of the first embodiment. More specifically, the racket frame had 64 string holes consisting of 28 longitudinal string holes 21 and 36 transverse string holes 22. Thus Ns / N was 1.0.

[0103]Three longitudinal string holes were formed as the extended longitudinal string holes 21-1 at each of the left and right connection portions 17 adjacent to the yoke part 16 and the left and right portions of the throat part 13 by extending the longitudinal string holes 21 to the peripheral surface of the throat part 13.

example 2

[0104]The racket frame of the example 2 had the same construction as that of the second embodiment. That is, of 68 string holes, four inclined string holes 23 were formed at the top side of the racket frame and the grip side thereof to receive a left-end longitudinal string and a right-end longitudinal string, and four inclined string holes 24 were formed at the left side of the racket frame and the right side thereof to receive an upper-end transverse string and a lower-end transverse string. 60 string holes were formed as longitudinal and transverse strings 21 and 22. The value of Ns1 / N1 was 0.88. The other constructions were the same as those of the example 1.

example 3

[0105]The racket frame of the example 3 had the same construction as that of the third embodiment. That is, the racket frame had 68 string holes. The racket frame 11 had eight inclined string holes 23, disposed at the top side thereof, into which four left-side longitudinal strings 41 and four right-side longitudinal strings 41 are inserted respectively; two string holes 23, disposed at the grip side thereof, into which one left-end longitudinal string and one right-end longitudinal string are inserted respectively; four string holes 24 into which two top-side transverse strings are inserted; and six string holes 24 into which three grip-side transverse strings are inserted. 48 string holes were longitudinal and transverse strings 21 and 22. The value of Ns / N was 0.71.

[0106]The other constructions were the same as those of the examples 1 and 2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A racket frame including a yoke part disposed between left and right portions of a throat part continuous with a head part and a shaft part; a string-mounting part, including the yoke part and the head part, which surrounds the ball-hitting face; and string holes formed on the string-mounting part. In this construction, supposing that a total of longitudinal string holes whose axial directions are parallel with a line drawn from an apex of the ball-hitting face to a center of a gripping part and transverse string holes whose axial directions are parallel with a widthwise direction, of the racket frame, which is orthogonal to the axial direction of the racket frame is Ns1 and that a total of all of the string holes is N1, a ratio of Ns1 to N1 is set to not less than 0.70 nor more than 1.0.

Description

[0001]This nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No(s). 2006-190971 filed in Japan on Jul. 11, 2006, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a racket frame for use in a tennis racket and a racket on which strings are tensionally mounted to increase the sweet area thereof.[0004]2. Description of the Related Art[0005]As shown in FIG. 12, in a conventional racket frame, string holes 2 are formed in penetration through the string-mounting part constituted of the yoke part and the head part surrounding the ball-hitting face, with the string holes 2 disposed vertically to a tangent to the circular arc-shaped racket frame 1. In this method, it is easy to use a drill in making the string holes 2 in the direction from the inner peripheral side 1a of the racket frame 1 to the peripheral side 1b thereof. Further this meth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): A63B49/02A63B51/06A63B102/02
CPCA63B49/02A63B60/00A63B49/025A63B49/022
Inventor ASHINO, TAKESHINIWA, KUNIO
Owner DUNLOP SPORTS CO LTD