Grounding Mat Terminal Separating Electrical and Mechanical Paths
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Solution Overview
Problem
Existing grounding mat terminals are prone to failure due to mechanical stresses from handling, which can lead to a break in the electrical path and loss of protection, posing a risk of electrocution.
Innovation Solution
A terminal design with a conductive grid pattern on a flexible base, featuring a distinct inner core for electrical communication and an outer casing for mechanical load transfer, separating electrical and mechanical load paths to enhance structural strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal uses flat braid wire protruding from the mat corners, then the electrical load path is established, but the terminal is prone to mechanical damage from handling
Solution Approach 1:
The terminal is divided into two distinct portions: a first portion (inner core) that provides the electrical load path, and a second portion (outer casing) that provides the mechanical load path. This segmentation allows each portion to be optimized for its specific function, preventing mechanical stresses from compromising the electrical connection.
Solution Approach 2:
The outer casing acts as an intermediary element between the user's handling forces and the inner core. It absorbs and redirects mechanical loads away from the electrical conductors, protecting them from bending, twisting, and tensile forces during mat handling.
2Reliability
If the same component serves both electrical and mechanical load paths, then device complexity is reduced, but the electrical path is vulnerable to mechanical failure
Solution Approach 1:
The terminal is divided into two distinct portions: a first portion (inner core) that provides the electrical load path, and a second portion (outer casing) that provides the mechanical load path. This segmentation allows each portion to be optimized for its specific function, preventing mechanical stresses from compromising the electrical connection.
Solution Approach 2:
The outer casing serves multiple functions: it provides mechanical strength for handling, protects the inner core from damage, and may provide additional electrical insulation. This multi-functionality justifies the added structural complexity by delivering multiple benefits from a single component.
3Ease of operation
If the terminal is handled repeatedly for lifting and positioning, then the mat is easier to maneuver, but the terminal undergoes cumulative mechanical stress leading to failure
Solution Approach 1:
The outer casing is designed beforehand to cushion and absorb the mechanical stresses that will be applied during repeated handling operations. This pre-engineered protection prevents cumulative damage to the inner core, extending the terminal's working life while maintaining ease of handling.
Solution Approach 2:
The outer casing may incorporate flexible materials that can deform elastically under handling loads and return to their original shape, accommodating repeated manipulation without permanent deformation or failure. This flexibility allows easy maneuvering while preserving terminal integrity over time.
Data Source
AI summary
This invention relates to a portable grounding mat, and more particularly to a mat specifically designed to protect electrical workers by providing a zone of equi-potential. The mat has a flexible base to which is attached at least one conductive element laid out in a grid pattern. A novel terminal that electrically connects the mat to a power source has an inner core to provide an electrical load path and an outer casing to provide a mechanical load path, resulting in a superior mat design.