Press Coupler for Electrical Conduit Eliminating Threaded Joints
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Solution Overview
Problem
Traditional electrical conduit systems face inefficiencies and structural weaknesses due to the need for threading, which is time-consuming, messy, and can lead to weakened joints and increased vulnerability to corrosion and fatigue, especially in hazardous and explosion-proof areas where thread flame-paths are compromised.
Innovation Solution
A press coupler system that uses a gasket and gripping ring to securely connect conduit pieces without threading, providing a sealing and grounding connection while allowing conduit cutting without the need for threading, thus eliminating the risks associated with thread formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional threading is used to join conduit to fittings, then a mechanical connection is achieved, but the conduit wall thickness is reduced by up to 55% leading to weakened joints
Solution Approach 1:
The invention extracts the threading operation from the conduit joining process entirely. Instead of cutting threads into the conduit wall, the system uses a press-fit coupling mechanism where the conduit is inserted into a fitting with a tapered bore that deforms the conduit elastically to create a mechanical interlock, eliminating material removal and preserving wall thickness
Solution Approach 2:
The invention replaces the traditional mechanical threading system with a press-fit deformation system. The fitting contains a tapered bore that, when the conduit is inserted and compressed, causes elastic deformation of the conduit wall to engage with the fitting interior surface, creating a strong joint without removing conduit material
2Reliability
If threading is performed to connect conduit pieces, then a secure mechanical connection is formed, but the process is time-consuming and messy with metal shavings and oil stains
Solution Approach 1:
The invention replaces the multi-step threading mechanical process with a single-step press-fit operation. The conduit is simply inserted into the fitting and compressed axially, causing the tapered bore to deform the conduit elastically and create an immediate secure connection, eliminating the time-consuming threading operation and associated mess
Solution Approach 2:
The invention changes the fundamental parameter of connection formation from material removal (threading) to elastic deformation (press-fit). The tapered bore geometry and compression force parameters are designed to create sufficient radial deformation of the conduit wall to form a secure mechanical interlock in a single rapid operation
3Ease of manufacture
If mating threads are etched into conduit pipe ends, then conduit can be joined to fittings, but burrs are created that can damage electrical wiring and compromise flame paths
Solution Approach 1:
The invention extracts the thread-cutting operation entirely from the conduit joining process. By using a press-fit mechanism with a tapered bore that deforms the conduit elastically, the system eliminates the generation of burrs and metal shavings that would otherwise damage wiring or compromise flame path integrity
Solution Approach 2:
The invention converts the potential harm of metal removal into a benefit by using controlled elastic deformation instead. The compression force that would otherwise create harmful burrs is redirected to create beneficial elastic deformation of the conduit wall, forming a secure mechanical interlock without generating harmful byproducts
4Strength
If threaded connections are used in hazardous and explosion-proof areas, then mechanical connection is achieved, but thread flame-paths are vulnerable to fatigue damage and corrosion
Solution Approach 1:
The invention extracts the threaded connection geometry from hazardous area applications. By using a smooth press-fit mechanism with elastic deformation, the system eliminates the flame path vulnerabilities associated with threaded connections, including fatigue damage from vibration and corrosion in exposed thread roots
Solution Approach 2:
The invention uses the elastic deformation of the conduit wall (a flexible response) to create the mechanical connection. The conduit wall acts as a flexible element that deforms under compression to engage with the fitting, creating a smooth, continuous surface that maintains flame path integrity without the discontinuities of threaded connections
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 press coupler system significantly reduces installation time and material waste, enhances structural integrity, and minimizes corrosion and fatigue risks, while maintaining compliance with safety standards by eliminating the need for thread formation and associated burrs.
Implementation Method 1
The gripping portion of the press coupler comprises at least one protrusion of varying shape and size, made of a material harder than the conduit, and capable of being compressed around, gripping and deforming the conduit
Implementation Method 2
The press coupler, once compressed around the conduit piping, forms an electrical grounding connection between the conduit, the press coupler, and the at least one projection
Data Source
AI summary
A press coupler is provided for use with a pipe or conduit system. The press coupler facilitates increased ease and speed of assembly of pipe and conduit installations and can be used with both threaded and non-threaded connections.