Racket Grommet Rigidity Layout for Spin and Repulsion Tuning
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Solution Overview
Problem
Existing racket designs do not effectively vary racket performance based on grommet configurations, limiting the ability to meet diverse user needs for ball repulsive and spin performance.
Innovation Solution
A grommet design with cylindrical parts featuring first and second formation sections having different rigidities, allowing orientation adjustment to enhance ball hitting performance by varying rigidity in the front/back and lateral directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a grommet with uniform rigidity is used, then the structure is simple, but the racket performance cannot be varied to meet diverse user needs
Solution Approach 1:
The grommet is designed with formation sections that have different rigidities at different locations. Specifically, the cylindrical part includes formation sections with varying wall thicknesses or material densities, allowing different regions of the grommet to have different rigidity characteristics. This enables the racket to provide varied ball repulsive and spin performances without requiring multiple different grommet components.
2Adaptability or versatility
If the cylindrical part has an oval or ellipsoidal outer edge, then the rigidity can be varied in different directions, but the manufacturing complexity increases
Solution Approach 1:
The cylindrical part of the grommet features an asymmetric cross-sectional shape, specifically an oval or ellipsoidal outer edge instead of a circular one. This asymmetric geometry naturally creates different rigidities along different axes - the major axis direction has higher rigidity while the minor axis direction has lower rigidity. The asymmetric shape can be manufactured using standard molding techniques, making it practical for production while achieving the desired directional rigidity variation.
Data Source
AI summary
Structures with racket performance varied according to the configurations of cylindrical parts can be easily used. A grommet includes a cylindrical part which is mounted pierced through a through hole formed in a frame of a racket and through which a string passes. The string is extended in a tensioned state on the frame so as to form front and back faces as hitting faces. The cylindrical part includes a first formation section forming both sides of a central axis position of the cylindrical part and a second formation section rotationally shifted with reference to the central axis position by 90 degrees relative to the first formation section and forming both sides of the central axis position. One of the first and second formation sections is disposed on both sides in a front/back direction. The first and second formation sections each have a different rigidity.