Self-Locking Textile Sling Splice for Stepless Length Adjustment
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Solution Overview
Problem
Textile slings lack a smooth and secure method for adjusting the length to handle asymmetrical loads, as existing solutions with adjustable splices require long insertion lengths and have weak points that can lead to slipping under load.
Innovation Solution
A flexible textile sling with a self-locking adjustable splice and a double-strand construction, featuring a reserve section and a pull-out protection, allowing for shorter insertion lengths and increased load capacity, with the splice acting as a wedge lock to tighten under tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a self-locking adjustable splice is used to enable stepless length adjustment of textile slings, then adaptability is improved, but the insertion length becomes excessively long and handling becomes difficult
Solution Approach 1:
The splice is divided into two separate components: a first splice part integrated into the sling and a second splice part that is detachable. This segmentation allows the second splice part to be inserted and locked without requiring excessive insertion length, while still enabling stepless adjustment of the sling length by varying the loop size.
Solution Approach 2:
The splice uses a dynamic self-locking mechanism where the second splice part can be freely inserted during adjustment but automatically locks when tension is applied. The locking behavior changes from free movement during insertion to locked position under load, enabling easy adjustment while maintaining security during use.
2Adaptability or versatility
If a self-locking adjustable splice is used to enable length adjustment, then adaptability is improved, but the splice connection becomes a weak point prone to slipping under load
Solution Approach 1:
The locking function is extracted from the traditional single-piece splice and implemented as a separate self-locking mechanism in the second splice part. This extracted locking mechanism engages with the first splice part through geometric interlocking and friction, creating a reliable connection that prevents slipping under load while maintaining adjustability.
Solution Approach 2:
The splice mechanism is self-locking, meaning it automatically secures itself under tension without requiring additional locking components or manual intervention. The second splice part's geometry and material properties enable it to self-lock when force is applied, eliminating the weak point of manual or mechanical locking systems.
3Adaptability or versatility
If conventional adjustable splices are used in textile slings, then length adjustment is possible, but the device complexity increases due to additional suspension elements
Solution Approach 1:
The splice integrates multiple functions into a single component structure. The first splice part and second splice part together form an integrated length adjustment system that eliminates the need for separate suspension elements, clips, or locking mechanisms. The combining of insertion, locking, and adjustment functions into the splice itself reduces overall device complexity.
Solution Approach 2:
The splice design serves multiple purposes: it provides length adjustment, self-locking under load, and structural integration all through the same component assembly. The first and second splice parts work together to provide universal functionality that replaces what would otherwise require multiple separate suspension elements and locking devices.
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 solution provides a safer, more efficient, and lighter textile sling with a significantly shorter insertion length, enhanced load capacity, and reduced weight, eliminating the need for additional suspension elements and minimizing the risk of slipping.
Implementation Method 1
the adjustable splice connection represents a weak point in the sling... the splice acting as a wedge lock to tighten under tension
Implementation Method 2
the self-locking splice in the direction of tension... the frictional engagement of the splice
Data Source
Figure 1~2
AI summary
The invention relates to a flexible, textile lifting device (1) for lifting loads, in particular for use with slings for lifting asymmetrical loads, for example multi-strand slings with at least one shortener that can allow the setting of a defined shortening length or also a single-strand sling whose length is variable according to main claim 1.