Ladder Safety Guide Wire with Tensioning Spool

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Solution Overview

Problem

Firefighters face significant risks while ascending or descending telescoping/extension and aerial ladders due to bulky gear, slippery surfaces, and varying ladder lengths, leading to potential falls and injuries, with existing safety devices being unsuitable for portable and telescoping ladders.

Innovation Solution

A safety guide-wire or rail system that extends and contracts with the ladder, maintaining constant tension to arrest falls, utilizing a spool with an electrical motor or spring mechanism for automatic or manual control, and incorporating a backup brake for reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing safety devices are used, then fall protection is provided, but they are not suitable for portable and telescoping ladders with varying lengths

Engineering Contradiction:

Improveadaptability to varying ladder lengthsVSAvoidreliability of fall protection

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The safety device incorporates a dynamic cable length adjustment mechanism that automatically adapts to varying ladder lengths. The cable connects to the ladder at multiple points and its effective length changes as the ladder telescopes, maintaining proper tension and fall protection throughout the full range of motion without requiring manual reconfiguration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The safety device is designed with universal mounting brackets and adjustable cable attachment points that work with various ladder configurations including portable, extension, and aerial ladders. The same basic device structure can be installed on ladders of different lengths and types, providing consistent fall protection across multiple applications.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If firefighters wear bulky gear and carry equipment, then they are properly equipped for rescue operations, but ladder climbing becomes extremely difficult and dangerous

Engineering Contradiction:

Improveease of ladder climbingVSAvoidsafety during ladder operations

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The safety device acts as an intermediary between the firefighter and the ladder structure. The cable and carabiner system provides a mechanical connection that independently supports the firefighter's weight, allowing them to climb with full gear without directly relying on their grip strength or balance on the ladder rungs.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The safety device applies preliminary anti-action by providing continuous upward tension through the cable system that counteracts the downward force of gravity on the equipped firefighter. This pre-applied counterforce reduces the effective weight the firefighter must support through their own strength, making climbing easier and safer.

Inventive Principle:

Principle #9Preliminary anti-action

3Productivity

If ladders are made vertical for efficient rescue operations, then access speed is improved, but the natural tendency to slip increases

Engineering Contradiction:

Improvespeed of rescue operationsVSAvoidslipping hazard

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The safety device converts the harmful effect of vertical ladder orientation that increases slipping risk into a beneficial configuration. By maintaining vertical positioning for rapid rescue operations, the device allows the increased gravitational force and slipping tendency to be safely managed through the cable support system, which actively prevents falls rather than requiring the ladder to be positioned at safer, less efficient angles.

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 system effectively arrests falls from ladders in various conditions, enhancing safety for firefighters and other climbers by maintaining consistent tension and adapting to ladder length changes, reducing the risk of injuries and fatalities.

Implementation Method 1

utilizing a spool with an electrical motor or spring mechanism for automatic or manual control

Methodology Applied

Scientific EffectSpring mechanism: Spring

Implementation Method 2

incorporating a backup brake for reliability

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS9447639B2Ladder safety device, systems and methods of arresting falls from ladders

Publication Date: 2016.09.20 REV GROUP INC

AI summary

A ladder safety device, systems and methods of arresting falls from ladders are provided. The ladder safety device includes a safety guide that extends along the length of an extension ladder. The length of the guide along the length of the ladder extends and contracts in unison with the extension and retraction of the extension ladder, and a tension is maintained on the guide to maintain a load during use of the ladder for climbing.