Cam-Actuated Wire Termination for Faster Reliable Connections
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Solution Overview
Problem
Existing electrical wiring devices lack efficient and convenient methods for securing electrical wires, particularly in terms of wire termination assemblies, which can be time-consuming and prone to errors during installation.
Innovation Solution
The development of cam-activated wire termination assemblies in electrical wiring devices, featuring a rotatable wire fastening member with a cam surface that secures wires by reducing the gap between the fastening member and the conductive member, and a locking system to maintain the wire in contact with the conductive member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional terminal screw type termination is used, then wire securing is achieved, but installation time is increased and operation becomes complex
Solution Approach 1:
The patent employs a dynamic cam mechanism that transforms rotational motion into linear clamping motion. The cam surface geometry converts a simple quarter-turn rotation into progressive wire compression, enabling rapid wire termination without complex multi-step screw tightening procedures. This dynamic transformation reduces installation time while maintaining secure wire attachment.
Solution Approach 2:
The invention extracts the essential wire securing function from the traditional screw mechanism and implements it through a simplified cam-actuated lever system. By removing the threaded engagement complexity and retaining only the core clamping action, the device achieves faster wire termination while preserving the fundamental wire securing capability.
2Ease of operation
If push-in termination with cage clamp is used, then wire insertion is simplified, but reliable wire contact and securing force are insufficient
Solution Approach 1:
The cam surface is designed with specific curvature characteristics that concentrate clamping force onto the wire. The curved cam profile creates a focused contact area that generates high localized pressure, ensuring reliable wire-to-conductor contact while maintaining ease of insertion. The geometric curvature transforms the simple push-in action into effective wire compression.
Solution Approach 2:
The device incorporates a preliminary wire guiding feature that positions the wire correctly before the cam engagement occurs. This preliminary action ensures the wire is properly aligned and seated prior to clamping, preventing misalignment issues and ensuring consistent reliable contact without requiring complex insertion procedures.
3Productivity
If cam activated wire termination assembly is used, then installation speed is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the single cam-actuated lever component. The lever simultaneously provides wire guidance, applies clamping force through the cam surface, and maintains continuous pressure on the wire-conductor interface. This functional integration achieves rapid installation without requiring separate components for each operation, thereby limiting the increase in device complexity.
Solution Approach 2:
The cam mechanism serves multiple purposes: it transforms rotational input into linear clamping motion, provides mechanical advantage for force multiplication, and maintains constant wire pressure through its geometric profile. This multi-functionality allows the device to achieve high installation speed while keeping the overall assembly relatively simple, as one component performs several critical functions.
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 provides a fast, convenient, and secure method for wire termination, enhancing installation efficiency and reliability by ensuring consistent contact between wires and conductive members, thus improving the overall performance of electrical wiring devices.
Implementation Method 1
The wire fastening member has a cam surface and is rotatable between an open position and a securing position. When the wire fastening member is rotated from the open position to the securing position, the cam surface rotates to reduce the size of the gap between the wire fastening member and the conductive member.
Data Source
AI summary
The electrical wiring device includes a cover and a base. The base has a wire chamber supporting a wire termination assembly. The wire termination assembly includes a wire fastening member and a conductive member. The wire fastening member has a cam surface and is rotatable between an open position and a securing position. The conductive member is positioned in close proximity to the wire fastening member such that a gap is provided between the wire fastening member and the conductive member when the wire fastening member is in the open position. When the wire fastening member is rotated from the open position to the securing position, the cam surface rotates to reduce the size of the gap between the wire fastening member and the conductive member.