Integrated Soft Shackle Button for High-Strength Rope Attachment
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Solution Overview
Problem
Existing soft shackles are either weak, prone to coming undone, or difficult to attach to the end of a line or rope without compromising strength, and prior art solutions like stainless steel shackles are heavy and can cause injury.
Innovation Solution
A notched button made of high-strength material is integrated into the bitter end of a line or rope to form a soft button shackle, with a notch and oval forming a bar that maintains the rope's strength and integrity, and a method of making and using this integrated shackle is provided.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stainless steel shackle is used to attach to the end of a line, then the strength and reliability of the attachment is improved, but the weight and hardness increase causing potential injury
Solution Approach 1:
The invention changes the material parameters from traditional metal to high-strength synthetic materials (spectra, dyneema, kevlar, technora) that provide equivalent or superior strength-to-weight ratio, eliminating the weight and injury issues while maintaining attachment strength
Solution Approach 2:
The invention uses composite construction combining braided line with a rigid button component made of high-strength material, creating a hybrid structure that achieves metal-like strength without the weight and hardness problems of traditional metal shackles
2Weight of moving object
If a soft shackle with a simple knot is used, then the weight is reduced and ease of use is improved, but the strength decreases and it can fail when overloaded
Solution Approach 1:
The invention divides the soft shackle into two functional segments: a flexible braided line portion for lightness and a rigid button portion with notched features for strength and load-bearing capability, combining advantages of both soft and hard shackles
Solution Approach 2:
The button acts as an intermediary component between the braided line and the load, providing a rigid interface that prevents the line from slipping or failing under heavy loads while maintaining the overall soft construction
3Strength
If a soft button shackle is used instead of a knot, then the strength and reliability are improved, but it becomes difficult to attach to the end of a line without compromising integrity
Solution Approach 1:
The invention merges the button component directly with the end of the braided line through integration methods (embedding, epoxing, heat shrinking, or knotting), creating a unified assembly that eliminates separate attachment steps and maintains full strength integrity
Solution Approach 2:
The button is pre-integrated into the line end during manufacturing, so that when the user receives the product, the strong attachment is already complete, eliminating the need for users to perform complex integration procedures
4Ease of operation
If a traditional soft shackle is used, then ease of use is improved, but it can accidentally come undone when under load
Solution Approach 1:
The button features asymmetric notched elements that create a directional locking mechanism, allowing the shackle to open easily in one direction for loading while preventing accidental opening in the reverse direction under load
Data Source
AI summary
A button is provided, for use in a soft shackle in a rope. The button is made of a material equal to or exceeding the strength of the rope. The button has a notch and an oval. The notch and oval form a bar. The bar is dimensioned in size to not deform when the button is under a load equal to the strength of the rope.