Cable Bushing Segmentation for Shield Grounding

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Solution Overview

Problem

Conventional cable bushings for guiding shielded cables through walls are cumbersome to mount, especially with long cables, and fail to provide adequate protection against electromagnetic radiation.

Innovation Solution

A cable bushing design featuring a first metal member for electrical connection between the cable shield and the wall, combined with a second bushing body that attaches to the first to secure the cable and establish a common ground, made from non-metal materials to simplify manufacturing and reduce costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a conventional cable bushing is mounted to the cable by threading the cable through a hole in the bushing, then the cable can be guided through the wall, but the mounting process becomes cumbersome and time-consuming especially with long cables

Engineering Contradiction:

Improvemounting processVSAvoidmounting time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The cable bushing is divided into a first bushing body and a second bushing body that can be assembled together. The first bushing body has a receiving cavity that accommodates the cable, while the second bushing body is attached to seal and secure the cable in place, eliminating the need to thread long cables through a single large hole.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cable is nested within the receiving cavity of the first bushing body, and the second bushing body is nested over the first bushing body to secure the cable. This nested structure allows the cable to be guided through the wall without requiring it to be threaded through the entire length of a single bushing component.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If conventional cable bushings are made entirely from non-metal materials, then manufacturing is simplified and costs are reduced, but electromagnetic radiation protection is insufficient

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidelectromagnetic radiation protection

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The cable bushing combines non-metal materials (plastic or resin for the bushing bodies) with a metal member (conductive material) to create a composite structure. The non-metal materials provide ease of manufacture and electrical insulation, while the metal member embedded in the first bushing body provides electromagnetic radiation protection through electrical connection to the cable shield and ground.

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If the cable shield is electrically connected to the wall via a metal member, then electromagnetic radiation protection is improved, but the risk of galvanic corrosion increases

Engineering Contradiction:

Improveelectromagnetic radiation protectionVSAvoidcorrosion resistance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The metal member is designed with specific material properties and surface treatments to change the parameters of the electrical connection. The metal member is made of conductive material and can be treated with anti-corrosion coatings or designed with galvanic isolation structures to prevent galvanic corrosion while maintaining electrical connectivity for electromagnetic shielding.

Inventive Principle:

Principle #35Parameter changes

4Ease of operation

If the second bushing body is made detachably attachable to the first bushing body, then ease of assembly and disassembly is improved, but structural strength is reduced

Engineering Contradiction:

Improveassembly and disassemblyVSAvoidstructural strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The cable is first positioned and secured within the receiving cavity of the first bushing body before the second bushing body is attached. This preliminary action ensures the cable is properly aligned and secured, and the detachable connection between the two bushing bodies is designed to maintain sufficient structural strength for this pre-secured configuration.

Inventive Principle:

Principle #10Preliminary action

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 solution enables easy and secure mounting of the cable bushing, effectively shielding the cable from electromagnetic radiation by grounding the cable shield, thus preventing signal interference and ensuring reliable protection.

Implementation Method 1

the first metal member is suitable for establishing an electrical connection between a cable shield of the cable and the wall

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

a cable bushing, which improves a protection of an electric signal inside the cable... effectively shielding the cable from electromagnetic radiation by grounding the cable shield

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentEP3897086B1Cable bushing

Publication Date: 2023.04.05 STASSINOPOULOS MICHAEL

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Figure 8A~8B

AI summary

A cable bushing (1) for guiding a cable through a wall (W) comprises a first bushing body (10), a first metal member (11) arranged in the first bushing body (10), and a second bushing body (20) attachable to the first bushing body (10) for pressing the cable against the first bushing body (10). The first bushing body (10) and the second bushing body (20) are made from a non-metal material. The first metal member (11) is suitable for establishing an electrical connection between a cable shield of the cable and the wall (W).