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Method for making rackets

A racket and foam technology, applied in the field of rackets, can solve the problem of not being able to swing the racket quickly and the like

Active Publication Date: 2018-09-04
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The player cannot swing the racket quickly

Method used

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  • Method for making rackets
  • Method for making rackets
  • Method for making rackets

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068] Such as Figure 1-3 The racket shown was prepared. A foam member ("PORON SR-S-24" as described above) was used for this racket. In this foam part, the density is 0.24g / cm 3 , the width W is 5.0mm, and the length is 680mm.

[0069] [Examples 2 to 4]

[0070] Racquets of Examples 2 to 4 were obtained in the same manner as in Example 1 except that the lengths of the respective foam members were shown in Table 1 below.

[0071] [Examples 5 to 13]

[0072] Racquets of Examples 5 to 13 were obtained in the same manner as Example 1 except that the foam members shown in Tables 2 and 3 were used.

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Abstract

A racket includes a head 8, a first foam 6a and a second foam 6b. The head 8 is formed from a fiber reinforced resin. The head 8 has an inside part 16, an outside part 18 and two middle parts 20. The foams 6 are joined to respective inner surfaces of the middle parts 20. Each foam 6 includes a matrix and a large number of bubbles dispersed in the matrix. In a cross section of the head 8, a ratio of an area of the foam 6 to an area of a space is equal to or greater than 5% and equal to or less than 50%. The foam 6 has a density of equal to or less than 0.30 g / cm 3 . The foam 6 has a 25%CLD measured in accordance with "JIS K6254" standard of equal to or less than 0.10 MPa.

Description

[0001] The present application claims priority to Japanese Patent Application No. 2014-24045 filed on February 12, 2014. The entire content of this prior application is incorporated herein by reference. technical field [0002] The present invention relates to a racket for tennis and the like. Background technique [0003] The frame of the tennis racket is formed from fiber reinforced resin. The matrix resin of the fiber reinforced resin is epoxy resin. The reinforcing fiber of the fiber-reinforced resin is carbon fiber. Reinforcing fibers are long fibers. The frame is formed by winding a plurality of prepregs and curing epoxy resin included in each prepreg. [0004] A racket having a frame formed of fiber-reinforced resin is disclosed in JP2013-172915 (US2013 / 0244817). The racket includes foam. The foam improves the rigidity of the racket. In addition, the foam increases the shock absorption capacity of the racket. The feel of this racquet at impact is excellent. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A63B49/02A63B102/02
CPCA63B49/10A63B2209/02A63B2209/14B29C53/56B29L2009/00
Inventor 山本阳介
Owner SUMITOMO RUBBER IND LTD