Tennis Racquet Isolation System for Spin Control
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Solution Overview
Problem
Conventional tennis racquets struggle to generate consistent and controlled spin, particularly in non-parallel impacts, due to limitations in in-plane and out-of-plane stiffness, leading to reduced control and shorter string life, while existing dual frame constructions fail to address spin enhancement and accuracy.
Innovation Solution
A tennis racquet design featuring an inner and outer frame connected by an isolation system that minimizes ball slippage through adjustable in-plane and out-of-plane stiffness, allowing for increased spin and accuracy by storing and returning energy during impact, and enabling easy replacement of inner frames and isolators for tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional tennis racquet stringing is used, then the racquet structure is simple, but spin generation is inconsistent and control is reduced
Solution Approach 1:
The racquet is divided into an inner frame with string bed and an outer frame, connected by isolators. This segmentation allows the inner frame to move independently during ball impact, enabling controlled string movement for spin generation while maintaining overall structural integrity through the outer frame.
Solution Approach 2:
The isolators connecting the inner and outer frames are designed with specific stiffness characteristics that allow dynamic movement during ball impact. The isolators permit controlled deformation that translates to enhanced string bed movement for spin generation, while maintaining stability during non-impact periods.
2Manufacturing precision
If dual frame construction with isolators is used, then spin and accuracy are enhanced, but device complexity increases
Solution Approach 1:
The isolators are strategically positioned at specific locations around the inner frame perimeter, providing localized flexibility where needed while maintaining rigidity elsewhere. This allows spin enhancement at the string bed level without requiring complex modifications throughout the entire racquet structure.
Solution Approach 2:
The isolators serve as intermediary elements between the inner and outer frames, mediating the transfer of forces and movements. They allow controlled relative movement between the frames during ball impact while maintaining structural connection, simplifying the overall design compared to fully integrated complex mechanisms.
3Reliability
If higher string tension is used to improve control, then ball slippage increases, but if lower tension is used to reduce slippage, then control and power are reduced
Solution Approach 1:
The isolators are designed with specific stiffness parameters that change during the impact cycle. During ball contact, the isolators deform to allow string movement that maintains friction with the ball, while returning to their original position to restore control. This dynamic parameter adjustment resolves the contradiction between friction consistency and performance.
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
The design enhances ball rotation and accuracy by maintaining frictional force between the ball and string bed, increasing spin regardless of impact angle, and extending string life through reduced slippage and optimized stiffness adjustments.
Implementation Method 1
The isolators are designed to have different stiffness in the x-y plane than in the z-direction, allowing them to store and return energy during impact
Implementation Method 2
maintaining frictional force between the ball and string bed, increasing spin regardless of impact angle
Data Source
AI summary
The present invention is directed to a racquet design with an inner and outer frame connected by an isolation system. Uniquely adapted to tennis racquets, the natural motion of the inner frame relative to the outer frame upon impact of the tennis ball on the inner frame will generate spin when the ball contacts the inner frame. The relationship between the inner frame, outer frame and isolation system can control the spin imparted to the ball for a given tennis swing. The tuning of the isolators relative to conventional racquet characteristics will increase the amount of ball spin caused by conventional racquets. The invention also increases the accuracy of the tennis ball's trajectory.