Non-Circular Grommet String Channel Vibration Control
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Solution Overview
Problem
The vibration behavior of stringing in ball game rackets is not effectively influenced by existing technologies, which affects the playing characteristics of the racket.
Innovation Solution
A ball game racket frame with grommets having non-circular string channel cross-sections that can change orientation relative to the string bed plane, allowing varying string deflection and vibration characteristics by altering the cross-sectional shape and material properties along the string channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional circular grommets are used, then the structure is simple and easy to manufacture, but the vibration behavior of the stringing cannot be effectively influenced
Solution Approach 1:
The patent applies asymmetry by changing the grommet's string channel cross-section from circular to non-circular (oval, rectangular, or racetrack-shaped). This asymmetric geometry creates different wall orientations that selectively influence string vibration in specific directions, enabling control over the stringing's vibration behavior while maintaining a relatively simple single-piece grommet structure
Solution Approach 2:
The patent implements local quality by creating non-uniform wall distributions within the string channel. The channel walls are positioned at specific locations and orientations (e.g., longer walls perpendicular to string bed, shorter walls parallel to string bed) to provide localized vibration control at different positions around the string passage, allowing targeted influence on vibration characteristics without complicating the overall grommet design
2Ease of operation
If non-circular string channel cross-section is used, then string deflection can be controlled, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by varying the cross-sectional geometry parameters of the string channel (oval, rectangular, racetrack-shaped) to control string deflection characteristics. By adjusting the dimensions and orientation of the non-circular cross-section, the design enables controlled string deflection behavior while using standard manufacturing processes like injection molding that can accommodate these geometric variations without requiring excessive precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the vibration behavior of the stringing, providing improved playing characteristics by adjusting string deflection and contact points, thereby optimizing the racket's performance.
Implementation Method 1
the string channel has a first string channel cross-section which is not circular, wherein the first string channel cross-section can take different orientations relative to the string bed plane, and wherein in a first orientation relative to the string bed plane the first string channel cross-section allows a smaller string deflection perpendicular to the string bed plane
Data Source
AI summary
The present invention relates to a grommet and a grommet strip for a ball game racket as well as to a specific ball game racket for receiving the grommet according to the invention or the grommet strip according to the invention.