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Racket

Pending Publication Date: 2021-12-16
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The racket in this patent has a vibration damper that reduces vibration at the frame, which helps to improve the feel and impact of the racket for players. The vibration damper adhesion to the racket's fiber reinforced layer is excellent, and it doesn't significantly change the stiffness of the racket. In summary, this racket provides both an excellent feel and stiffness for players.

Problems solved by technology

The vibration propagates to the player, thereby causing discomfort to the player.
The vibration absorber disclosed in Japanese Laid-Open Patent Application Publication No. 2002-045444 has insufficient adhesion to the fiber reinforced layer.
Such a vibration absorber impairs the stiffness of the frame.
A racket that is inferior in stiffness is also inferior in rebound performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0077]The tennis racket shown in FIGS. 1 to 6 was obtained. The racket includes a fiber reinforced layer and a vibration damper. The fiber reinforced layer includes reinforcement fibers and a matrix whose base material is an epoxy resin. As the vibration damper, a commercially available sheet (the aforementioned “KRAIBON” (trade name)) was used. The material of the vibration damper is a polymer composition whose base material is a styrene-isoprene-styrene block copolymer. The thickness of the vibration damper is 0.5 mm.

example 2

[0078]A tennis racket of Example 2 was obtained in the same manner as in Example 1, except that a different commercially available sheet (trade name “PIEZON”) was used as the vibration damper. The material of the vibration damper is a polymer composition whose base material is an acrylic elastomer.

examples 3 to 8

[0081]Tennis rackets of Examples 3 to 8 were obtained in the same manner as in Example 1, except that the position of the vibration damper was varied as shown in Table 2 below.

Evaluation

[0082]Players did a rally by using each tennis racket. The players evaluated the rebound performance (flight), vibration absorption performance, feel at impact, and control performance of each racket. The evaluation results are shown in Tables 1 and 2 below.

In Tables 1 and 2, the greater the numerical value, the higher the evaluation.

TABLE 1Evaluation results.Comparative ComparativeExample 1Example 2Example 1Example 2MaterialSISACPE—PositionFIG. 3FIG. 3FIG. 3—FIG. 4FIG. 4FIG. 4—Rebound 8648performanceVibration 8883absorptionperformanceFeel at impact9864Control 8875performanceOverall 9765evaluationSIS: Styrene-isoprene-styrene block copolymerAC: Acrylic elastomerPE: Chlorinated polyethylene

TABLE 2Evaluation Results.Ex-Ex-Ex-Ex-Ex-Ex-ampleampleampleampleampleample345678MaterialSISSISSISSISSISSISPositio...

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PUM

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Abstract

A tennis racket includes throats. Each throat includes a fiber reinforced layer and a vibration damper. The vibration damper is surrounded by the fiber reinforced layer. The fiber reinforced layer includes a plurality of reinforcement fibers and a matrix. The reinforcement fibers are typically carbon fibers. The material of the matrix is a resin composition whose base material is an epoxy resin. The vibration damper is formed of a polymer composition. The polymer composition contains a base polymer. The base polymer is preferably a styrene-isoprene-styrene block copolymer or an acrylic elastomer.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to and the benefit of Japanese Patent Application No. 2020-101333, filed on Jun. 11, 2020, the entire disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to rackets for use in, for example, tennis.Description of the Related Art[0003]When a player hits a ball with a tennis racket, the racket vibrates. The vibration propagates to the player, thereby causing discomfort to the player.[0004]Japanese Laid-Open Patent Application Publication No. 2002-045444 discloses a racket frame including a fiber reinforced layer and a vibration absorber. The vibration absorber is inserted in the fiber reinforced layer. The vibration absorber can suppress the vibration that propagates to the player.[0005]The vibration absorber disclosed in Japanese Laid-Open Patent Application Publication No. 2002-045444 has insufficient adhesion to the fib...

Claims

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Application Information

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IPC IPC(8): A63B49/03A63B49/10
CPCA63B49/03A63B49/10A63B2209/02A63B2209/00A63B60/54A63B49/02A63B2209/023A63B49/022
Inventor SUZUKI, FUMIYA
Owner SUMITOMO RUBBER IND LTD