Racket Frame Common Hole Structure for Longer String Length
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Solution Overview
Problem
The existing racket frames have through holes that cause the strings to be bent at large angles, resulting in shortened effective lengths, which affects the flexibility and performance of the strings.
Innovation Solution
The racket frame features common holes and tubular portions with elongated inner openings in the circumferential direction, allowing the strings to be inserted and extended without significant bending, thereby increasing their effective lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the string is inserted into the inclined through hole, then the hole structure is simple, but the string is bent at a large angle and the effective length becomes short
Solution Approach 1:
The patent applies local quality by creating a common hole with a specific elongated shape at strategic locations where both main strings and cross strings need to pass through. This localized structural modification allows the strings to maintain their effective length without requiring complex hole arrangements throughout the entire frame.
Solution Approach 2:
The common hole is designed with an elongated shape in the circumferential direction rather than a circular cross-section. This dimensional change in the hole geometry allows the strings to pass through with minimal bending, effectively increasing the usable length of the strings while maintaining structural simplicity.
2Length of moving object
If the inner opening shape of the common hole is elongated in the circumferential direction, then the effective length of the string is increased, but the manufacturing precision requirement increases
Solution Approach 1:
The patent changes the geometric parameters of the common hole by elongating it in the circumferential direction. This parameter modification allows for increased string effective length while the specific dimensional ratios provided in the embodiment guide the manufacturing process to achieve the desired shape with controlled precision requirements.
3Reliability
If the string is fixed at the bending position in the inclined through hole, then the string is securely fixed, but the effective length range is reduced
Solution Approach 1:
The patent extracts the bending and fixation function from the inclined through hole configuration and relocates it to the elongated common hole structure. By taking out the unnecessary bending component, the string can maintain a straighter path through the common hole, extending its effective length while still achieving secure fixation through the elongated geometry.
Data Source
AI summary
A racket frame includes a frame main body having a loop shape. The frame main body is provided with a plurality of holes, a plurality of main strings extend in an up-down direction and are arranged in a right-left direction and a plurality of cross strings extend in the right-left direction and are arranged in the up-down direction. Through a common hole, out of the plurality of holes, any one of the plurality of main strings and any one of the plurality of cross strings are inserted. A shape of an inner opening of the common hole on an inner peripheral surface of the frame main body is formed such that an opening dimension in a circumferential direction of the frame main body is larger than an opening dimension in a thickness direction of the frame main body.