Double-Wedge Cable Fitting for Higher Retention in Tight Spaces
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Solution Overview
Problem
Conventional electrical cable fittings with single wedges are inefficient in providing strain relief and often require longer lengths, making them difficult to mount in tight spaces and costly to manufacture, while compromising on self-guiding properties when attempting to shorten them.
Innovation Solution
A cable fitting with a dual wedge design, comprising a gland nut, a body, and a chuck with multiple segments, where the gland nut and body have sloped surfaces that compress the chuck inwardly to secure the cable, reducing the overall length and enhancing retention force without compromising alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single wedge design is used in conventional cable fittings, then the structure is simpler, but the cable retention force is insufficient and the fitting length is excessive
Solution Approach 1:
The chuck is divided into multiple segments (typically three) that can independently collapse inward when compressed by the dual wedge mechanism. This segmentation allows the force to be distributed across multiple contact points with the cable, significantly increasing retention force while the modular design enables compact packaging that reduces overall fitting length
Solution Approach 2:
The patent combines two wedge surfaces (first wedge surface on the gland nut and second wedge surface on the body) working simultaneously on opposite sides of the chuck. This dual wedge configuration merges two force application points into a unified compression system, creating balanced inward force that enhances cable retention while maintaining a compact structure
2Ease of operation
If the fitting length is reduced to facilitate mounting in tight spaces, then ease of installation improves, but self-guiding properties are compromised
Solution Approach 1:
The wedge surfaces are designed with asymmetric angles optimized for both compression efficiency and self-alignment. The first and second wedge surfaces have different orientations relative to the cable axis, creating a mechanical guidance system that automatically centers the chuck during installation. This asymmetric geometry provides self-guiding properties without requiring excessive length
Solution Approach 2:
The patent transitions from a single-axis compression approach to a multi-dimensional force application system. The dual wedge surfaces apply force from opposite directions (radial dimensions) while the segmented chuck collapses in multiple directions simultaneously. This multi-dimensional approach enables compact length while maintaining precise alignment through geometric constraints
3Force
If a dual wedge design is implemented to increase retention force and reduce length, then cable retention and compactness improve, but device complexity increases
Solution Approach 1:
The gland nut and body components serve multiple functions: they provide the wedge compression surfaces for force application, they contain the threaded connection for assembly, and they provide the structural framework for the segmented chuck. This multi-functionality reduces the need for separate components, managing complexity while achieving high retention force through the dual wedge mechanism
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 dual wedge design provides increased cable retention force and reduced fitting length, improving ease of installation in tight spaces while maintaining predictable alignment and reducing manufacturing costs.
Implementation Method 1
the gland nut and body have sloped surfaces that compress the chuck inwardly to secure the cable
Implementation Method 2
the compressive forces cause inward deformation of the chuck to secure the cable within the axial pathway
Data Source
AI summary
A cable fitting includes a gland nut, a body, and a chuck. The gland nut includes first threads, an axial gland bore, and a first sloped surface along a portion of the axial gland bore. The body includes second threads to receive the first threads, an axial body bore, and a second sloped surface along a portion of the axial body bore. The chuck includes multiple segments joined in a hinged fashion to create a ring. Each of the multiple segments includes a distal end tapered surface and a proximal end tapered surface. When the gland nut is advanced onto the body, the first sloped surface applies a first compressive force to the distal end tapered surfaces, and the second sloped surface applies a second compressive force to the proximal end tapered surfaces. The compressive forces cause inward deformation of the chuck to secure a cable within an axial pathway.