Welded Armor for Fiber Cable Eliminating Overlap

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Solution Overview

Problem

The existing corrugated armoring layer for communication cables has an overlapped portion that adds cost, rigidity, and weight, and hinders the functionality of ripcords, while also being prone to 'zippering' of the outer jacket, which allows water ingress.

Innovation Solution

A corrugated armoring layer with an elongated strip of metal or alloy where the first and second side edges are welded continuously or intermittently, primarily at the peaks of the corrugations, eliminating the need for an overlapped portion and using a conductive adhesive tape for additional sealing and shielding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an overlapped portion is used in the armoring layer, then the cable provides better protection against water ingress and structural integrity, but the cable weight, cost, and rigidity increase

Engineering Contradiction:

Improveprotection against water ingressVSAvoidcable weight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The patent replaces the mechanical adhesive bonding system with an electromagnetic welding system. The armoring layer edges are welded together using electric current to create a metallurgical bond, eliminating the need for adhesive overlays. This substitution maintains structural integrity and water ingress protection while removing the excess material associated with overlapped portions, thereby reducing cable weight.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts and eliminates the overlapped portion from the armoring layer design. By welding the edges directly together without requiring an overlap extension, the patent removes the redundant material that previously existed at the seam location, reducing overall cable weight while maintaining protective functions.

Inventive Principle:

Principle #2Taking out (Extraction)

2Strength

If an overlapped portion is used in the armoring layer, then the cable maintains structural integrity, but the ripcord functionality is hindered

Engineering Contradiction:

Improvestructural integrityVSAvoidripcord accessibility

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent replaces mechanical adhesive bonding with electromagnetic welding to join armoring layer edges. This substitution creates a seamless joint without the bulky overlapped portion that previously obstructed ripcord access. The welded seam maintains structural integrity while presenting a smooth surface that does not interfere with ripcord insertion and operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention removes the overlapped portion that was creating physical obstruction for ripcord access. By welding edges directly together without overlap, the patent extracts the problematic section that prevented easy ripcord insertion, thereby improving operational ease while preserving armoring strength through the welded joint.

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If an overlapped portion is used in the armoring layer, then the cable provides EMI shielding, but the outer jacket is prone to zippering

Engineering Contradiction:

ImproveEMI shieldingVSAvoidzippering of outer jacket

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent replaces adhesive bonding with electromagnetic welding to join armoring layer edges. This substitution eliminates the gap formation that occurs with adhesive failures in overlapped portions. The welded joint creates a continuous, smooth surface that prevents the sharp edge formation responsible for cutting and zippering the outer jacket, while maintaining EMI shielding through the continuous metallic barrier.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts and eliminates the overlapped portion that was creating sharp edges prone to cut the outer jacket. By welding edges directly together without overlap, the patent removes the source of the zippering problem while maintaining the continuous metallic structure necessary for EMI shielding.

Inventive Principle:

Principle #2Taking out (Extraction)

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 design minimizes the length of the overlapped portion, reducing weight and cost, enhances ripcord accessibility, and prevents water ingress and electromagnetic interference while maintaining structural integrity and shielding properties.

Implementation Method 1

the first and second side edges are welded continuously or intermittently

Methodology Applied

Scientific EffectWelding: Welding

Data Source

PatentUS20250020886A1Welded armor for fiber cable

Publication Date: 2025.01.16 COMMSCOPE TECHNOLOGIES LLC

AI summary

A corrugated armoring layer for a communication cable is primarily formed of an elongated strip of metal or alloy, e.g., steel, having a first side and an opposite, second side. The armoring layer is wrapped around a cable core so that first and second side edges come to abut, or slightly overlap, and then are welded either continuously or intermittently to form a seam. In the case of intermittent welding, it is preferred that only the tops or outward-facing ridges of the corrugations are welded, such as every top corrugation or every other top corrugation is welded. A conductive adhesive tape may be applied along the seam as well, if additional environmental sealing and/or electrical shielding is desired.