Conductive Clamp Assembly for Low-Friction Grounding Contacts
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Solution Overview
Problem
Conventional grounding mechanisms in switchgear systems experience wear due to constant lateral spring force on sliding contacts, leading to inadequate ground connections and friction issues during installation.
Innovation Solution
A conductive clamp assembly with pivot arms and spring assemblies that bias electrical contacts for secure clamping onto grounding bars, minimizing friction and ensuring stable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sliding contacts are used with constant lateral spring force, then grounding connection is maintained, but friction causes wear on contact surfaces and installation difficulty
Solution Approach 1:
The patent transitions from a static constant spring force system to a dynamic system where the spring force varies during installation. The spring assembly provides increasing clamping force as the conductive clamp assembly slides onto the grounding bar, ensuring adequate contact pressure is achieved only when properly positioned, rather than maintaining constant high force throughout the entire installation process.
Solution Approach 2:
The patent divides the contact surface into multiple discrete contact points along the sliding interface. Instead of a single large contact area requiring high force, multiple smaller contact points are distributed along the grounding bar interface, allowing the spring force to be distributed and reducing the peak force required at any single point, thereby reducing wear and friction.
2Reliability
If constant lateral spring force is applied to sliding contacts, then electrical contact is maintained, but friction and wear increase
Solution Approach 1:
The patent implements a periodic or staged application of spring force through the sliding mechanism. As the conductive clamp assembly slides onto the grounding bar, the spring assembly progressively engages and applies force in stages rather than all at once. This staged engagement reduces the peak friction force experienced during installation while ensuring adequate contact pressure is achieved in the final position.
Solution Approach 2:
The spring force is made dynamic rather than constant, varying during the installation process. The spring assembly is positioned such that minimal force is applied during the sliding motion, and maximum clamping force is achieved only when the conductive clamp assembly reaches its final position on the grounding bar, thereby maintaining electrical contact while minimizing wear during the installation process.
3Stress or pressure
If large lateral spring force is exerted on sliding contacts, then electrical contact pressure is sufficient, but friction causes installation difficulty and contact wear
Solution Approach 1:
The patent employs a dynamic spring force system where the clamping pressure builds progressively as the conductive clamp assembly slides onto the grounding bar. The spring assembly is positioned and oriented such that the full clamping force is only engaged when the assembly reaches its final position, rather than being applied throughout the entire sliding motion. This dynamic force application ensures adequate contact pressure for electrical connection while minimizing friction and installation difficulty.
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 conductive clamp assembly provides secure, low-friction electrical connections by using pivot arms and spring assemblies to clamp onto grounding bars, reducing wear and ensuring reliable grounding during maintenance and testing.
Implementation Method 1
A spring assembly may be engaged to each electrical contact
Implementation Method 2
A pivot arm may be engaged with a respective spring assembly and configured to pivot onto the respective spring assembly to bias the respective spring assembly against the respective electrical contact
Data Source
AI summary
An electrical contact assembly includes a frame and an electrically conductive frame contact carried by the frame. A conductive clamp assembly is configured to slide on the electrically conductive frame contact into a contact position and clamp into secure electrical contact with the electrically conductive frame contact. The conductive clamp assembly includes opposing electrical contacts spaced apart a distance to receive the electrically conductive frame contact and slide thereon as the conductive clamp assembly moves into the contact position. A spring assembly is engaged to each electrical contact, and a pivot arm engaged with a respective spring assembly and configured to pivot onto the respective spring assembly to bias the respective spring assembly against the respective electrical contact.