Drop Cable Clamp With Controlled Cutting Under Excessive Axial Load

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Solution Overview

Problem

Existing cable clamps fail to effectively manage excessive axial forces applied to aerial cable spans, leading to cable severing, clamp breakage, or structural damage, posing safety risks and requiring costly breakaway couplers.

Innovation Solution

A cable clamp design incorporating a shell, wedge, and blade element that engages the cable tightly and cuts it when an excessive axial force is applied, eliminating the need for breakaway couplers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a traditional cable clamp is used to support aerial cable spans, then the cable is securely held and strain relief is provided, but under excessive axial force the cable may sever, the clamp may break, or the structural attachment may be damaged

Engineering Contradiction:

Improvecable support reliabilityVSAvoiddamage from excessive force

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The blade element is positioned to accidentally cut the cable if an excessive axial force is applied to the cable within the channel. This converts the harmful excessive force into a beneficial safety mechanism that prevents dangerous sagging and potential accidents by severing the cable before it can cause structural damage or injury.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The cable clamp is divided into functional segments: the shell for structural support, the wedge for frictional engagement, and the blade element for emergency cable severing. This segmentation allows each component to specialize in its function, with the blade element specifically dedicated to handling excessive force scenarios.

Inventive Principle:

Principle #1Segmentation

2Reliability

If breakaway couplers are added to prevent cable severing under excessive force, then safety is improved, but device complexity and cost increase

Engineering Contradiction:

Improvesafety under excessive forceVSAvoidclamp structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cable clamp merges multiple functions into a single integrated device: the shell provides structural support, the wedge provides frictional engagement and strain relief, and the blade element provides emergency cable severing. This consolidation eliminates the need for separate breakaway couplers, reducing device complexity while maintaining safety.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cable clamp achieves multi-functionality by incorporating the blade element that can both support normal cable loads through frictional engagement and automatically sever the cable under excessive force. This universal design replaces the need for separate safety devices like breakaway couplers.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Strength

If the cable is tightly engaged to provide strain relief, then the cable is securely held, but under excessive force the clamp or attachment structure may break

Engineering Contradiction:

Improvecable holding strengthVSAvoidstructural damage from excessive force

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The blade element converts the harmful excessive axial force into a beneficial safety action by automatically severing the cable. This prevents the excessive force from being transmitted to the clamp structure and attachment points, eliminating the risk of structural damage while maintaining strong cable engagement during normal operation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 cable clamp safely and efficiently cuts the cable under high stress, preventing dangerous sagging and reducing the risk of accidents while potentially lowering costs by eliminating the need for additional safety mechanisms.

Implementation Method 1

The wedge 80 can bias the shim 40 against the cable 2 towards the shell 10 to keep the cable 2 in a desired locked position by a frictional force.

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

said blade element includes a blade base and a cutting portion with a cutting edge, and wherein said cutting edge faces toward the cable

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS20250323483A1Drop cable clamp with controlled cable cutting feature

Publication Date: 2025.10.16 COMMSCOPE TECHNOLOGIES LLC

AI summary

A cable clamp includes a shell having a shell base with a first sidewall and a second sidewall forming a channel extending in a first direction to receive a cable therein. A wedge resides between the first and second sidewalls and includes a wedge base facing the shell base. A shim resides between the wedge base and the shell base, and the cable fits between the shim and the shell base. Movement of the shell relative to the wedge causes the cable to engage more tightly between the shim and the shell base. In one embodiment, a blade element resides between the shim and the shell base. The blade may be a separate element from the shim or attached to or integrally formed with the shim. The wedge may include a recessed area or a cutout portion to accommodate the blade. A cutting edge of the blade element faces toward the cable and will cut the cable in response to an excessive force along the first direction being applied to the cable within the channel.