Segmented Racquet String Design for Power Transmission
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Solution Overview
Problem
Conventional ball game racket strings have constant structures and compositions, which limit their ability to adapt to varying requirements and improve power transmission and handling.
Innovation Solution
The string is designed with varying sections along its longitudinal direction, featuring integrally connected and unconnected sections of multiple filaments made from conventional materials, bonded using high temperatures, UV, or laser light, allowing for optimized properties and power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional constant-structure strings are used, then manufacturing simplicity is maintained, but power transmission and handling performance are limited
Solution Approach 1:
The string is divided into multiple sections along its longitudinal direction, where each section has a different structural configuration (connected vs. unconnected filaments). This segmentation allows different portions of the string to provide different functional properties, optimizing both power transmission in certain sections and flexibility in others, thereby resolving the contradiction between improved performance and structural simplicity.
Solution Approach 2:
Different sections of the string are given different local qualities through varying the connection state of filaments. The connected sections provide structural integrity and power transmission, while unconnected sections provide flexibility and adaptability. This local differentiation allows the string to simultaneously achieve high power transmission and optimized handling characteristics.
2Power
If filaments are integrally connected in sections, then power transmission is improved, but manufacturing complexity increases
Solution Approach 1:
The filaments are prepared with connection sections and unconnected sections in advance during the string manufacturing process. By pre-establishing the sectional connection pattern, the complex multi-filament structure is created systematically before installation, making the manufacturing process more manageable despite the increased complexity compared to conventional strings.
Solution Approach 2:
The patent employs advanced manufacturing techniques such as laser bonding or ultrasonic welding to connect filaments in specific sections, replacing traditional mechanical assembly methods. This substitution enables precise control over connection locations and strengths, facilitating the creation of complex sectional structures with improved manufacturing efficiency and consistency.
3Ease of operation
If multiple filaments are used with varying sections, then handling and rebound forces are improved, but string uniformity is reduced
Solution Approach 1:
The string is segmented into connected and unconnected sections, creating a non-uniform composition along its length. This segmentation allows the string to provide enhanced handling characteristics through the unconnected sections while maintaining structural integrity through the connected sections, resolving the contradiction between improved ease of operation and reduced composition uniformity.
Solution Approach 2:
The physical parameters of the string (such as filament connection state, section length ratios, and material properties) are deliberately varied along the longitudinal direction to optimize handling performance. By controlling these parameter changes systematically, the string achieves superior handling and rebound characteristics while maintaining predictable and reliable performance through controlled non-uniformity.
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 power transmission and handling by varying the properties of the string, particularly in the racquet head, resulting in improved rebound forces and performance compared to conventional strings.
Implementation Method 1
The two or more filaments thus coated pass lengthwise, parallel to one another (i.e., in substantially the same longitudinal direction), through a mechanism that allows two or more filaments to be permanently and integrally bonded together in sections. This mechanism preferably uses high temperatures, UV light, or laser light to bind the filaments together via the coating.
Implementation Method 2
This mechanism preferably uses high temperatures, UV light, or laser light to bind the filaments together via the coating.
Data Source
Figure 1~3f
Figure 4~5
AI summary
The present invention relates to a string for a ball racquet, the string having at least two filaments which run parallel to each other, wherein the filaments are connected to each other only in some sections. Furthermore, the invention relates to a method for producing a string of this type. A first method has the steps of providing at least two string filaments, bringing together the string filaments to form a configuration running in parallel and connecting the string filaments in some sections. An alternative production method has the steps of providing a string and slitting the string in some sections in order to produce at least two string filaments which run parallel to each other and are connected to each other only in some sections.