Shaft Connection Device Using Spring Diameter Adjustment
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Solution Overview
Problem
Current connection devices for shafts are prone to failure due to vibration and misalignment, and existing adjustable golf club mechanisms are not strong enough to withstand the stresses of a golf swing, nor do they meet the requirements of governing bodies like the USGA and R&A for adjustability and safety.
Innovation Solution
A mechanism using helical forms to create a positive-locking or self-locking connection between shafts, with a spring that alters its diameter to secure the shafts in place and resist rotation, allowing for adjustable length and secure attachment, while an anti-rotation device ensures compliance with golfing regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction-based or simple locking mechanisms are used for shaft connection, then the device is simple and easy to manufacture, but the connection reliability is insufficient under vibration and stress
Solution Approach 1:
The spring element provides dynamic adjustment capability, allowing the connection mechanism to adapt to varying loads and misalignments. The spring can compress and expand to maintain optimal contact pressure between shafts, ensuring reliable connection under vibration while keeping the overall mechanism relatively simple.
Solution Approach 2:
The connection device is divided into distinct functional components: the spring element for force application, the locking mechanism for position fixation, and the adjustment features for alignment. This segmentation allows each component to be optimized independently while maintaining overall simplicity and reliability.
2Adaptability or versatility
If adjustable length mechanisms are added to golf clubs, then adaptability to different golfers is improved, but the mechanism may not be strong enough to withstand swing stresses
Solution Approach 1:
The spring-based locking mechanism provides dynamic strength, allowing the connection to accommodate adjustment movements while maintaining secure locking during swing stresses. The spring can absorb impact forces and maintain connection integrity throughout the golf swing cycle.
Solution Approach 2:
The mechanism allows continuous length adjustment by changing the positional parameter of the shafts relative to each other. The spring force and locking mechanism ensure that this parameter change does not compromise the overall strength and stress resistance of the connection.
3Adaptability or versatility
If existing telescoping mechanisms are used, then length adjustment is possible, but the mechanisms fail to meet governing body requirements for safety and compliance
Solution Approach 1:
The spring-based locking mechanism is designed to be self-regulating and self-locking, automatically maintaining secure connection without requiring external intervention or complex safety systems. This self-service capability ensures compliance with governing body requirements for safety and reliability.
Solution Approach 2:
The dynamic spring mechanism provides continuous adaptation to load conditions, ensuring that the connection remains secure and compliant throughout various swing conditions and adjustment positions, meeting the stringent requirements of golf governing bodies.
4Strength
If multiple springs are used to connect shafts, then the connection strength is improved, but the device complexity increases
Solution Approach 1:
The use of multiple springs is segmented into specific functional zones: one spring for axial force application and another for radial alignment. This segmentation allows each spring to perform its specific function efficiently while keeping the overall mechanism manageable and not excessively complex.
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 mechanism provides a strong, adjustable, and secure connection that can withstand the stresses of a golf swing, allowing for continuous length adjustment while meeting the requirements of governing bodies, ensuring safety and compliance.
Implementation Method 1
a spring which when a force is applied to it alters its diameter so as to accept one shaft and when the force is no longer applied bears against an external surface of the shaft to form a friction fit
Implementation Method 2
bears against an external surface of the shaft to form a friction fit
Data Source
AI summary
According to one aspect of the present invention there is provided an adjustable mechanism for connecting two or more shafts, including at least a first shaft having an external surface with an outer diameter and a second shaft which is hollow at a first end, wherein a spring is anchored to the first end of the second shaft, the spring having an inner diameter of similar dimensions to the outer diameter of the first shaft, the spring configured such that when a force is applied to the spring its inner diameter is greater than the outer diameter of the first shaft so that the second shaft can move over the first shaft to a desired position relative to the first shaft, and when the force is no longer applied to the spring it is biased to return to its original inner diameter to bear against the external surface of the first shaft.