Composite Golf Shaft with Steel Core and Graphite Shell
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Solution Overview
Problem
Conventional putter shafts are made of inexpensive steel and lack engineered features tailored to the unique demands of putting, leading to instability and poor performance.
Innovation Solution
A golf shaft design featuring a butt portion joined to a tip portion by a coupler, with unique rigidity relationships that enhance stability and adjustability, including varying sidewall thicknesses and material densities to optimize flexural and torsional rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional steel shafts are used for putters, then cost is reduced, but stability and performance are worsened
Solution Approach 1:
The putter shaft is constructed as a composite structure with an inner steel core and an outer graphite shell. This composite design combines the cost-effectiveness and strength of steel with the stability and vibration-damping properties of graphite, resolving the contradiction between low cost and high stability.
Solution Approach 2:
The shaft employs different materials in different regions - steel at the core for structural integrity and cost efficiency, graphite at the outer layer for stability and performance. This local differentiation of material properties optimizes both cost and stability simultaneously.
2Ease of manufacture
If putter shafts are made simple and inexpensive, then manufacturing cost is reduced, but engineered features tailored to putting demands are lost
Solution Approach 1:
The composite construction provides engineered features specifically suited for putting - the graphite outer layer offers vibration damping and stability characteristic of high-performance shafts, while the steel core maintains structural integrity, creating a shaft tailored to putting demands without excessive cost.
Solution Approach 2:
The shaft design incorporates specific parameter optimizations including wall thickness ratios, material density combinations, and dimensional proportions that are engineered to match the unique requirements of putting strokes, transforming a simple shaft into an adapted performance-oriented component.
3Device complexity
If the shaft lacks engineered rigidity relationships, then manufacturing is simpler, but face velocity consistency and club face stability are reduced
Solution Approach 1:
The composite structure inherently provides the necessary rigidity relationships through the interaction between steel core and graphite shell, achieving face velocity consistency and club face stability without requiring complex additional structural elements.
Solution Approach 2:
The shaft incorporates localized structural features including varying wall thicknesses and material distributions at specific sections (tip, middle, butt portions) to optimize rigidity characteristics where needed, maintaining simplicity elsewhere while ensuring reliable performance.
Data Source
AI summary
A multi-component golf club shaft possessing unique characteristics including flexural and torsional rigidity profiles.