Stackable Spacer Golf Club Shaft Adjustment

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Solution Overview

Problem

Current methods for adjusting golf club length are complex, require specialized skills and tools, and can damage the club, making it difficult and expensive for golfers to customize their clubs without professional assistance.

Innovation Solution

A variable length golf club shaft system using stackable spacers with keyed projections and sockets, a shaft adapter, and a cap secured by a bolt, allowing for quick and easy length adjustments without damaging the original shaft or grip, and can be used with existing clubs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the grip is removed and the shaft is trimmed or extended using conventional methods, then the club length can be adjusted, but the original shaft and grip are damaged and require expensive replacement components and specialized tools

Engineering Contradiction:
Improveclub lengthVSAvoiddamage to shaft and grip
Core Design Contradiction:
Length of moving objectVSObject-affected harmful factors

Solution Approach 1:

The invention divides the shaft into modular segments by introducing removable spacers that can be stacked on the butt end. Each spacer is a discrete component with keyed features that allow them to be individually added or removed to achieve different lengths, eliminating the need to damage the original shaft.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The invention introduces spacers as intermediary components between the grip and the shaft body. These spacers serve as mediators that extend or adjust the effective length of the shaft without requiring modification to the original shaft or grip components.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Length of moving object

If conventional shaft extension methods are used, then the club length can be changed, but specialized skills and tools are required and the process is complex

Engineering Contradiction:
Improveclub lengthVSAvoidadjustment process complexity
Core Design Contradiction:
Length of moving objectVSDevice complexity

Solution Approach 1:

The invention transforms the static shaft into a dynamic, adjustable structure by incorporating removable spacers. The keyed projection and socket features enable the spacers to be easily attached and detached, allowing the shaft length to be dynamically changed without complex procedures.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The keyed features on the spacers and shaft adapter are designed to be intuitively assembled by the user without requiring specialized tools or skills. The self-explanatory keyed connection system allows golfers to perform the adjustment themselves.

Inventive Principle:
Principle #25Self-service

3Length of moving object

If the entire shaft is replaced using head-shaft connection devices, then the club length can be adjusted, but the head must have special hardware and the process is not applicable to all clubs

Engineering Contradiction:
Improveclub lengthVSAvoidapplicability to different clubs
Core Design Contradiction:
Length of moving objectVSAdaptability or versatility

Solution Approach 1:

The invention creates a universal adjustment system that can be applied to any golf club with a standard shaft. The spacers interface with the butt end of the shaft, which is a common feature across all golf clubs, making the system universally applicable without requiring special head hardware.

Inventive Principle:
Principle #6Universality (Multi-functionality)

4Length of moving object

If conventional methods are used to adjust club length, then length changes can be achieved, but expensive new components must be purchased

Engineering Contradiction:
Improveclub lengthVSAvoidcost of replacement components
Core Design Contradiction:
Length of moving objectVSLoss of substance

Solution Approach 1:

The invention uses inexpensive spacer components that can be easily replaced or adjusted. Rather than requiring expensive new shafts or grips, the system uses affordable spacers that serve their purpose of length adjustment without needing to be high-value components.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS9216334B2Variable length golf club shaft
Publication Date: 2015.12.22 CALLAWAY GOLF COMPANY
  • US9216334B2 patent drawing
  • US9216334B2 patent drawing
  • US9216334B2 patent drawing

AI summary

A variable length shaft assembly comprising at least one spacer, a shaft portion, and a threaded fastener, wherein the threaded fastener removably connects the spacer to the lower shaft, is disclosed herein. The variable length shaft assembly may further comprise at least two spacers that are stackable on a butt end of the shaft portion so a golfer can adjust the total length of the shaft. Methods of adjusting the length of a golf club shaft without damaging any portion of the shaft and variable length shaft kits are also disclosed herein.