Spring-Loaded Wire Termination Assemblies for Vibration-Stable Motor Switches
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Solution Overview
Problem
Current electrical wire terminations in multi-pole devices, such as motor disconnect switches, are inefficient due to the use of screw-based systems that require precise torque and can loosen under vibration, increasing installation time and reliability concerns.
Innovation Solution
The development of screwless wire termination assemblies with a spring-loaded mechanism that automatically clamps wires using a plunger and clamping member, allowing for quick and secure wire connection without the need for screws, and maintaining the connection under various environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw-based wire termination is used, then wire connection strength can be achieved, but installation time increases and torque sensitivity causes reliability issues
Solution Approach 1:
The patent removes the screw fastening mechanism from the wire termination assembly, extracting the problematic torque-sensitive component while retaining the essential wire clamping function through a spring-loaded mechanism that eliminates the need for torque-controlled fastening
Solution Approach 2:
The spring-loaded clamping member automatically applies clamping force to the wire when the actuating member is engaged, eliminating the need for manual torque application and allowing the system to self-regulate the clamping force without operator intervention
2Strength
If screw-based wire termination is used, then wire clamping force can be applied, but vibration causes the screws to loosen over time
Solution Approach 1:
The patent employs a dynamic spring-loaded clamping member that can adapt to vibrations and movement, allowing the clamping force to be maintained continuously through the elastic properties of the spring rather than a fixed mechanical connection that can loosen
Solution Approach 2:
The spring mechanism provides inherent cushioning against vibrational forces before they can cause loosening, absorbing the shocks and movements that would otherwise compromise the connection stability of rigid screw fastenings
3Productivity
If direct pressure termination is used, then installation is faster, but connection reliability is insufficient for multi-pole devices
Solution Approach 1:
The spring-loaded mechanism automatically engages and applies clamping force when the wire is inserted and the actuating member is engaged, providing reliable termination without requiring manual tightening operations that slow down installation
Solution Approach 2:
The spring is pre-loaded to provide immediate clamping force upon wire insertion, eliminating the need for sequential tightening steps required by screw terminations while ensuring adequate connection reliability from the outset
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
This solution significantly reduces installation time, enhances reliability by eliminating torque sensitivity and vibration-induced loosening, and ensures consistent wire connection across different wire sizes and environmental conditions.
Implementation Method 1
The wire terminal includes a clamp brace and a clamping member. The clamping member is movable between a closed position where a wire can be clamped between the clamping member and the clamp brace, and an open position where the wire can be inserted
Implementation Method 2
The development of screwless wire termination assemblies with a spring-loaded mechanism that automatically clamps wires using a plunger and clamping member
Data Source
AI summary
Multi-pole or multi-phase electrical wiring devices that incorporate clamp-type wire termination assemblies are described. The electrical wiring devices include multi-pole motor switches. The electrical wiring devices include a plurality of wire termination assemblies. Each wire termination assembly includes a wire terminal and an activating member.