Adjustable Golf Club Shaft Length and Weight Zone Optimization
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Solution Overview
Problem
Traditional metal wood golf club shafts are fixed in length, requiring users to cut or replace them to adjust fit, which is inconvenient and does not allow for weight optimization within a specific weight zone for improved performance.
Innovation Solution
An adjustable golf club shaft with a rotating drive shaft and locking mechanism that allows for length adjustment by at least 1 inch, featuring a grip portion with a locking element and a lower shaft in frictional contact, enabling the total length to be adjusted between 40 and 48 inches while maintaining a weight less than 110 grams within a defined weight zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed length shaft is used, then the structure is simple, but the adaptability to different user needs is poor
Solution Approach 1:
The shaft is divided into multiple segments (first shaft portion and second shaft portion) that can be adjusted relative to each other. The grip portion is separable from the lower shaft, allowing users to adjust the overall length by changing the configuration of these segments while maintaining a relatively simple overall structure.
Solution Approach 2:
The shaft transitions from a fixed static structure to a dynamic adjustable structure. The engaging mechanism allows the shaft segments to move relative to each other and be locked in different positions, providing length adjustability while maintaining structural integrity during use.
2Length of moving object
If the shaft length is increased, then the club can reach farther, but the weight in the weight zone increases
Solution Approach 1:
Different portions of the shaft have different weight characteristics. The upper shaft portion (in the weight zone) is designed to be lighter while the lower shaft portion can be heavier. This local differentiation allows the shaft to achieve desired length without excessive weight in the critical weight zone, improving the length-to-weight ratio.
Solution Approach 2:
The patent addresses weight considerations by moving to a different design dimension - using variable cross-sectional areas and strategic material placement. The shaft uses a tapered design with smaller diameter in the weight zone and larger diameter in the lower portion, optimizing the distribution of mass along the length of the shaft.
3Adaptability or versatility
If an adjustable mechanism is added, then the length can be customized, but the reliability under load may be compromised
Solution Approach 1:
The engaging mechanism is designed with pre-positioned locking elements and guides that automatically engage and disengage in a controlled manner. The locking element is prepared in advance within the engaging mechanism to securely lock the shaft segments together, ensuring reliable operation under load without requiring complex user intervention.
Solution Approach 2:
The engaging mechanism acts as an intermediary between the shaft segments, providing a reliable connection that can be easily engaged and disengaged. This intermediary component ensures that the shaft maintains structural integrity under axial loads while still allowing for easy adjustment, bridging the gap between adjustability and reliability.
4Ease of operation
If the grip portion is made adjustable, then the fit can be optimized, but the manufacturing complexity increases
Solution Approach 1:
The grip portion is designed as a separate, adjustable component that can be independently manufactured and then assembled to the lower shaft. This segmentation allows for simplified manufacturing of each component while providing adjustable fit options. The grip portion can be made with standard dimensions and adjusted by changing its position relative to the lower shaft.
Solution Approach 2:
The engaging mechanism is designed to accommodate different grip portion configurations and lengths, making it a universal interface. This multi-functional design allows the same engaging mechanism to work with various grip configurations, reducing the need for specialized manufacturing for each variation and simplifying production.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adjustable mechanism allows for customizable length and weight distribution, enhancing user flexibility and performance by ensuring the club's weight within the specified zone is optimized, preventing axial or rotational movement under axial loads, and maintaining a traditional feel and grip.
Implementation Method 1
A lower shaft having an inner surface that is in frictional contact with the locking element
Implementation Method 2
The drive shaft is connected with the engaging mechanism and is configured to rotate upon movement by the engaging mechanism
Data Source
AI summary
An adjustable length golf club shaft having a grip portion with an end point is disclosed. A locking element is located within the grip portion and a lower shaft having an inner surface that is in frictional contact with the locking element is also disclosed. The locking element is configured to engage the inner surface of the lower shaft. A total length of the golf club shaft is adjustable by a distance of at least one inch and a total weight of the golf club shaft in a weight zone is less than 110 g. The weight zone is defined as a region of the golf club shaft extending from the end point of the grip portion up to 11″ along a central axis of the golf club shaft toward a tip portion of the shaft.