Radiused Conduit Fittings for Lower Cable Pulling Force
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Solution Overview
Problem
Conventional conduit bodies face challenges in reducing the force required to pull cables through due to friction and water accumulation, which can lead to increased installation costs and regulatory compliance issues.
Innovation Solution
The design includes a conduit body with a radiused transition section and increased internal chamber volume to reduce frictional drag and a drain port for water extraction, facilitating easier cable installation and drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional conduit bodies are used, then the structure is simple and manufacturing is easy, but the cable pulling force required is too great due to friction and tight bends
Solution Approach 1:
The patent applies curvature by replacing sharp corners and straight transitions with radiused surfaces. The transition section between the first and second conduit sections features a radius of curvature that matches the cable bend radius, allowing the cable to follow a smooth curved path rather than forcing sharp bends. This reduces friction and pulling force requirements while maintaining a relatively simple overall conduit body structure.
Solution Approach 2:
The patent introduces additional spatial dimension by creating a three-dimensional transition section that extends beyond the simple planar connection between conduit sections. The radiused transition creates a volumetric space that accommodates cable bending in multiple dimensions, providing relief from tight two-dimensional bends while adding minimal structural complexity.
2Object-affected harmful factors
If conventional conduit bodies are used, then manufacturing is straightforward, but water accumulates in the conduit body creating corrosion and safety hazards
Solution Approach 1:
The patent extracts the harmful element (water) from the conduit body by incorporating a drain hole in the bottom surface of the transition section. This drain hole provides a direct pathway for water to exit the conduit body, preventing accumulation and subsequent corrosion or safety hazards. The drain feature is integrated into the transition section geometry, adding minimal manufacturing complexity while effectively eliminating water accumulation.
3Ease of operation
If larger trade size conduit is used to reduce pulling force, then cable installation becomes easier, but the expense and size increase beyond regulatory requirements
Solution Approach 1:
The patent applies local quality by concentrating the friction-reducing features specifically at the transition section where the cable experiences the most resistance. Rather than increasing the overall conduit size throughout the entire run, the radiused transition section locally modifies the geometry only where needed to facilitate cable bending and reduce pulling force. This allows standard conduit sizes to be used while achieving easier cable installation.
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 reduces the required pulling force for cable installation and prevents water accumulation, enhancing installation efficiency and compliance with industry regulations.
Implementation Method 1
configured for reducing frictional drag of a cable pulled though the internal chamber
Implementation Method 2
a drain port in fluid communication with the internal chamber
Data Source
AI summary
A conduit body includes a sidewall defining an internal chamber and at least two ports providing access to the internal chamber, and a cover connectable to the sidewall to enclose the internal chamber. The sidewall defines a first surface section adjacent one of the at least two ports, a second surface section adjacent another of the at least two ports, and a radiused transition section connecting the first surface section and the second surface section and configured for reducing frictional drag of a cable pulled though the internal chamber. The first surface section is spaced apart from the second surface section to increase a volume of the internal chamber.