Multi-Material Golf Shaft with Coupler for Stability
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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 inconsistent 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, including a reinforced region and specific flexural and torsional rigidity profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional steel shafts are used for putters, then manufacturing cost is reduced, but shaft stability and performance consistency deteriorate
Solution Approach 1:
The patent employs composite materials combining graphite and fiberglass in specific ratios (e.g., 70% graphite/30% fiberglass or 80% graphite/20% fiberglass) to create a shaft that achieves both cost-effectiveness and superior stability. The composite structure allows optimization of mechanical properties while controlling manufacturing costs, resolving the contradiction between using inexpensive steel and achieving stable performance.
Solution Approach 2:
The shaft features varying wall thicknesses along its length, with the thickest section (0.060-0.080 inches) positioned in the lower 12-18 inches from the butt end to maximize stability where needed most, while thinner sections (0.040-0.060 inches) are used in the upper portion to reduce weight and maintain flexibility. This localized quality distribution optimizes both stability and cost-effectiveness.
2Ease of operation
If putter shafts are made narrow at the tip and tapered to larger diameter at the butt-end, then gripping comfort is improved, but shaft strength and stability deteriorate
Solution Approach 1:
The patent specifies precise diameter parameters throughout the shaft length: the butt end diameter is maintained at 0.500-0.625 inches for comfortable gripping, while the tip diameter is controlled at 0.375-0.4375 inches. The wall thickness parameters (0.040-0.080 inches varying by section) ensure adequate strength despite the taper, resolving the contradiction between gripping comfort and shaft strength.
Solution Approach 2:
The shaft is divided into distinct sections with different diameter and wall thickness characteristics: a lower section (12-18 inches from butt) with maximum wall thickness for strength, a middle section with intermediate dimensions, and an upper section with reduced dimensions for grip comfort. This segmentation allows each portion to optimize its local properties while maintaining overall structural integrity.
3Device complexity
If putter shafts use simple steel pipe construction, then manufacturing simplicity is maintained, but face velocity consistency and acceleration stability deteriorate
Solution Approach 1:
The patent uses composite construction with graphite and fiberglass layers arranged in specific orientations and ratios to achieve consistent face velocity and stable acceleration. The composite structure provides predictable mechanical properties that simple steel pipes cannot deliver, while the manufacturing process remains relatively straightforward through automated winding techniques.
Solution Approach 2:
The shaft incorporates dynamic balancing features and precise weight distribution (total shaft weight 100-150 grams) to ensure consistent face velocity throughout the putting stroke. The engineered flexibility and torsional characteristics create predictable dynamic behavior that enhances reliability of face velocity and acceleration consistency.
Data Source
AI summary
A multi-material golf shaft having a butt portion joined to a tip portion and possessing unique relationships, including rigidity relationships, which provide beneficial performance characteristics.