Racket Stringing Assembly With Locking Grommets for Variable Tension
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Solution Overview
Problem
Existing rackets face issues such as loss of power due to string elasticity and tension over time, string breakage, and prolonged stringing time due to knot-tying, with varying rebound force affecting control and power based on string tension.
Innovation Solution
A racket design featuring grommets with locking systems that allow for individual string tensioning, reducing the need for knots and enabling variable tension, and the use of contoured strings to enhance power and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single long string is used for stringing the racket, then the stringing process requires tying multiple knots (2-4 knots), but this increases the stringing time significantly
Solution Approach 1:
The patent divides the single long string into multiple separate strings, each string being individually tensioned and secured. This segmentation eliminates the need for tying multiple knots to join string segments, as each string can be independently installed and tensioned without requiring knot-tying operations, thereby significantly reducing stringing time while maintaining structural integrity.
Solution Approach 2:
The patent introduces a specialized grommet with a locking mechanism as an intermediary component between the string and the racket frame. This grommet acts as a mediator that secures the string ends without requiring knots, providing a time-efficient alternative to traditional knot-tying methods while ensuring proper tension maintenance.
2Ease of operation
If high string tension is used, then control over rebound direction is improved, but power is diminished
Solution Approach 1:
The patent implements variable tension across different string positions by incorporating independent tensioning mechanisms for each string or string group. This allows different regions of the racket to have optimized tension levels - higher tension in areas requiring control and lower tension in areas requiring power - thereby simultaneously achieving both control over rebound direction and adequate power without the traditional trade-off.
Solution Approach 2:
The patent employs adjustable and adaptable tensioning systems that allow the tension of individual strings to be dynamically modified based on playing conditions and player preferences. This dynamic capability enables the racket to adapt its characteristics, providing high control when needed and high power when needed, rather than being fixed at a single tension level.
3Reliability
If polyester strings are used, then durability is improved, but tension is lost faster compared to other materials
Solution Approach 1:
The patent incorporates tension maintenance mechanisms such as locking grommets and adjustment systems that compensate for tension loss over time. These mechanisms allow for periodic tension adjustment and maintenance without requiring complete restringing, thereby extending the effective duration of optimal string performance even when using polyester strings that naturally lose tension faster.
4Reliability
If traditional stringing with knots is used, then string securing is achieved, but string breakage risk increases due to stress concentration at knot points
Solution Approach 1:
The patent extracts and eliminates the knot-tying step from the stringing process by using specialized grommets with locking mechanisms that secure strings without knots. This removal of the knotting operation eliminates the stress concentration points that knots create, thereby reducing the risk of string breakage while maintaining effective string securing to the racket frame.
Data Source
AI summary
A grommet assembly and a stringing assembly for rackets are disclosed. The stringing assembly includes a plurality of grommets. Each of the plurality of grommets is configured within a corresponding slot from a plurality of slots formed on a peripheral surface of a head of a racket. The plurality of grommets includes a set of grommet pairs. Each of the set of grommet pairs is configured to be oppositely disposed on the peripheral surface horizontally or vertically with reference to the head. The stringing assembly further includes a plurality of strings for stringing the racket. Each of the plurality of strings corresponds to a grommet pair. Each of the plurality of strings includes a body and two ends. The body is configured to pass through the associated grommet pair and be enclosed within the head. The two ends cooperate with the associated grommet pair to create variable tension in body.