Rectangular Sporting Pipe Bulging Portions Suppress Shaft Rotation
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Solution Overview
Problem
Existing athletic sticks experience unwanted rotation during ball-hitting, affecting the directionality and speed of the hit, due to insufficient suppression of torque in the shaft.
Innovation Solution
A hollow rectangular sporting pipe with bulging portions on its surface, constructed from a prepreg sheet with circumferentially-oriented reinforcing fibers, which are arranged in a circular arc shape to enhance stiffness and grip engagement, reducing rotation and improving impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shaft is made with a simple rectangular cross-section, then the manufacturing is simple, but the shaft rotation during ball-hitting cannot be effectively suppressed
Solution Approach 1:
The patent applies local quality by adding bulging portions only at specific locations (corners or side surfaces) of the rectangular shaft cross-section, rather than changing the entire shaft structure. This localized modification enhances grip engagement and rotation suppression while maintaining the overall simplicity of the rectangular shaft design and manufacturing process.
2Ease of manufacture
If the shaft is made circular or elliptical, then the manufacturing is easier, but the torque acting on the shaft during ball-hitting increases
Solution Approach 1:
The patent employs asymmetry by using a rectangular cross-section instead of circular or elliptical shapes. The rectangular geometry creates asymmetric stress distribution during ball-hitting that reduces torque acting on the shaft. The addition of bulging portions at corners further enhances this asymmetric structure to optimize torque suppression while maintaining manufacturing feasibility.
3Manufacturing precision
If the shaft is made with enhanced rotation suppression features, then the ball-hitting directionality improves, but the device complexity increases
Solution Approach 1:
The patent applies spheroidality by forming bulging portions with curved surfaces at the corners or side surfaces of the rectangular shaft. These curved bulging portions enhance grip engagement between the shaft and user's hand, improving rotation suppression and ball-hitting directionality. The curvature is integrated into the existing rectangular shaft structure, avoiding excessive complexity while achieving the desired performance enhancement.
Data Source
AI summary
A rectangular sporting pipe includes a shaft and at least two bulging portions formed on a surface portion of the shaft, the bulging portions extending in a longitudinal direction of the shaft and bulging outwardly.