Electrical Connector Bushing With Textured Inner Surface
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Solution Overview
Problem
Existing electrical bushings face issues with cable pull-out performance, requiring excessive torque on the threaded gland to prevent cable slippage, and can damage the cable's outer jacket with aggressive gripping mechanisms.
Innovation Solution
A bushing with a textured inner diameter surface, enhanced by affixing or embedding solid particles, which increases the coefficient of friction without necessitating higher torque, thereby improving pull-out resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a deformable bushing is compressed axially to grip the cable, then the mechanical grip on the cable is improved, but the torque required on the threaded gland increases excessively
Solution Approach 1:
The bushing incorporates a textured area with increased surface roughness at the specific location where it contacts the cable. This localized modification increases the coefficient of friction between the bushing and cable, enhancing grip strength without requiring increased compression force or torque on the threaded gland.
2Strength
If extruded solid gripping teeth are used between the cable and bushing, then the wedge action and grip strength are improved, but the cable outer jacket is damaged
Solution Approach 1:
Instead of using solid gripping teeth that mechanically penetrate and damage the cable jacket, the invention changes the surface parameter of the bushing by adding a textured area with increased roughness. This modifies the friction characteristics to enhance grip strength while maintaining the integrity of the cable outer jacket.
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 textured surface enhances the bushing's ability to resist cable pull-out forces with reduced torque requirements on the threaded gland, minimizing damage to the cable jacket.
Implementation Method 1
The textured area increases the coefficient of friction of the bushing on the cable, thus requiring a greater force to pull it free from the electrical fitting
Data Source
AI summary
A new bushing for strain reducing electrical fittings is disclosed. The bushing increases the pull-out performance of the fitting by including a textured area where the bushing comes into contact with the cable. The textured area may be created by affixing solid particles to the bushing so that the friction between the bushing and cable is increased.