Variable Length Golf Club Shaft Using Notch-and-Screw Adjustment
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Solution Overview
Problem
Current methods for adjusting golf club length are complex, require specialized tools and components, and often damage the original shaft and grip, making it difficult for average golfers to modify club length without professional assistance or significant expense.
Innovation Solution
A variable length golf club shaft system featuring a shaft adapter, engagement device, screw, and cylindrical grip support with notches, allowing for quick and semi-permanent length adjustments by sliding the grip support along the shaft and securing with a screw, which can be easily tightened or loosened to change the club's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the grip is removed and the shaft is trimmed or extended using traditional methods, then the club length can be adjusted, but the original shaft and grip are damaged and require expensive replacement components and specialized tools
Solution Approach 1:
The invention divides the shaft into modular segments: a fixed shaft portion, an adjustable extension portion, and a grip portion. The extension portion can be independently adjusted in length using the notch-and-screw mechanism, allowing length changes without damaging the original shaft or grip. This segmentation enables the harmful practice of cutting or forcibly extending the original shaft to be avoided.
Solution Approach 2:
The extension portion is pre-configured with multiple notches at predetermined positions before use. These notches are prepared in advance at specific intervals (e.g., every 1/8 inch or 1/4 inch) along the extension portion, allowing the user to simply select and engage the desired length without requiring measurement or modification during the adjustment process.
2Adaptability or versatility
If traditional shaft extension methods are used, then club length can be changed, but specialized tools, spare components, and high technical skill are required
Solution Approach 1:
The adjustment mechanism uses a universal screw-and-notch system that can be implemented on any golf club shaft type (drivers, woods, irons, putters). The same basic components (extension portion with notches, screw, and grip support) serve multiple functions: length adjustment, length locking, and integration with various club head types. This eliminates the need for club-specific adjustment tools or procedures.
Solution Approach 2:
The invention enables golfers to perform their own shaft length adjustments without requiring professional club fitters or technicians. The mechanism is designed to be operated with simple tools (a standard screwdriver or Allen wrench) that any golfer would reasonably have available. The self-contained nature of the extension portion with its pre-marked notches allows users to make accurate adjustments independently.
3Ease of operation
If the entire shaft is replaced to change length, then the new length is achieved, but the cost is very high and professional assistance may be needed
Solution Approach 1:
Instead of replacing the entire shaft, the invention segments the shaft system into a permanent original shaft portion and a separate, adjustable extension portion. Only the extension portion needs to be modified or replaced to change length, which is much less expensive than replacing the entire shaft assembly. The original shaft, club head, and grip are preserved and reused.
Solution Approach 2:
The invention allows the original shaft and grip to be recovered and reused after length adjustment. Rather than discarding the original shaft when changing length (as would be required with traditional replacement methods), the original shaft is retained and combined with an adjustable extension portion, maximizing the value and lifespan of the original club components.
Data Source
AI summary
A variable length shaft assembly comprising a shaft adapter, a grip support, and an engagement device is disclosed herein. The variable length shaft assembly of the present invention allows a golfer to quickly, semi-permanently, and inexpensively change the overall length of the shaft assembly, such that the shaft performs as desired and conforms to USGA rules. The variable length shaft assembly of the invention may further a travel limiter to prevent parts of the shaft assembly from disengaging from each other. Methods of adjusting the length of a golf club shaft without damaging any portion of the shaft are also disclosed herein.