Tennis Racquet Dual-Frame Isolation 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, and suffer from reduced string life due to increased wear and frictional sliding, which affects spin generation 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 enhanced spin and accuracy by storing and returning energy during impact, while also extending string life through reduced relative motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tennis racquets use traditional stringing patterns, then the structure is simple and easy to manufacture, but the ability to generate consistent spin is limited and string life is reduced due to increased wear and frictional sliding
Solution Approach 1:
The racquet frame is divided into an inner frame and an outer frame, with the string bed attached to the inner frame. This segmentation allows the string bed to move independently relative to the outer frame, enabling consistent spin generation through controlled in-plane motion while maintaining structural integrity. The segmentation resolves the contradiction by creating a complex but functional dual-frame structure that improves spin reliability.
Solution Approach 2:
The inner frame is nested within the outer frame, with the string bed on the inner frame able to move independently. This nesting configuration allows the string bed to slide in-plane relative to the outer frame boundary, generating consistent spin while maintaining an organized, manufacturable structure. The nested design resolves the contradiction between spin consistency and structural complexity.
2Reliability
If the racquet frame is rigid to provide structural stability, then manufacturing is easier, but ball slippage increases reducing spin generation and accuracy
Solution Approach 1:
The isolation system incorporates in-plane motion capability that allows the string bed to dynamically adjust during ball impact. This dynamic motion prevents ball slippage and improves spin accuracy while maintaining overall frame rigidity. The dynamic design resolves the contradiction by adding controlled mobility to an otherwise rigid structure, improving spin accuracy without significantly complicating manufacturing.
3Duration of action of stationary object
If the string bed is firmly attached to the frame to maintain structural integrity, then the racquet is easier to manufacture, but string wear increases reducing string life
Solution Approach 1:
The string bed is extracted from direct attachment to the outer frame and instead attached to the inner frame, which is isolated from the outer frame by the isolation system. This extraction reduces relative motion between the string bed and outer frame, decreasing string wear and extending string life. The isolation system adds controlled complexity to resolve the contradiction between string life and structural integrity.
4Ease of operation
If the racquet uses a simple single-frame design, then the structure is simpler and easier to manufacture, but the ability to control in-plane motion for spin generation is limited
Solution Approach 1:
The isolation system enables controlled in-plane motion of the inner frame relative to the outer frame during ball impact. This dynamic capability allows players to generate and control spin more effectively while maintaining an overall simple dual-frame structure. The dynamic design resolves the contradiction between spin control and structural complexity by adding only the necessary motion capability.
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 increases ball rotation and accuracy by maintaining frictional force between the ball and string bed, providing consistent spin regardless of impact angle and reducing string wear, thus enhancing player performance and racquet longevity.
Implementation Method 1
adjustable in-plane and out-of-plane stiffness, allowing for enhanced spin and accuracy by storing and returning energy during impact
Implementation Method 2
maintaining frictional force between the ball and string bed
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.