Ladder Fall Control Cable for Self-Rescue Descent
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Solution Overview
Problem
Ladders pose a safety risk due to the risk of users falling and becoming incapacitated at elevated work regions, requiring third-party rescue, which can expose rescuers to similar hazards and is often inefficient without proper fall control systems.
Innovation Solution
A ladder with an integrated fall control system comprising a tensioner, mount, cable, and arrestor that supports user weight, allows controlled descent, and includes a tether system for securing the ladder to an anchor point, ensuring user safety and reducing rescue risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed tether or safety harness is engaged to prevent falls, then user safety is improved, but the user can become stranded at elevated work region and requires third-party rescue which exposes rescuers to similar hazards
Solution Approach 1:
The fall control system enables self-rescue by allowing the user to control their own descent through the cable and arrestor mechanism. The user can actively manage the arrestor to descend safely without requiring external rescue, making the system self-sufficient for both fall prevention and rescue operations.
Solution Approach 2:
The system transitions from a static fixed tether to a dynamic controlled descent mechanism. The arrestor can be actively controlled by the user to allow gradual descent along the cable, transforming the system from a purely protective restraint to an active rescue tool that adapts to the user's needs during emergency situations.
2Reliability
If a tether system is used to prevent falls, then user safety is improved, but the system complexity increases requiring additional components like tensioner, cable, and arrestor
Solution Approach 1:
The cable and arrestor components serve multiple functions: they provide fall arrest capability, enable controlled descent, and facilitate self-rescue operations. This multi-functionality reduces the need for separate dedicated rescue equipment, effectively managing system complexity while maintaining comprehensive safety capabilities.
Solution Approach 2:
The fall protection and rescue functions are merged into a single integrated system. The same cable and arrestor mechanism used for fall arrest is also used for controlled descent and self-rescue, combining what would traditionally require separate systems into one unified apparatus.
3Ease of operation
If the ladder freedom to ascend and descend is maintained, then operational flexibility is improved, but the risk of user separation from ladder and falling increases
Solution Approach 1:
The cable and arrestor system acts as an intermediary safety mechanism between the user and the fall hazard. It allows the user to maintain freedom of movement on the ladder while providing a continuous safety backup that activates automatically upon fall detection, mediating between operational freedom and safety protection.
Solution Approach 2:
The fall control system provides beforehand cushioning by being pre-positioned and ready to activate. The cable and arrestor are in place before any fall occurs, providing immediate protection the moment a fall is detected, cushioning the impact and preventing injury before it can fully occur.
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 fall control system effectively prevents falls and allows controlled descent of incapacitated users, reducing the risk of injury to both users and rescuers, while maintaining ladder stability and ease of inspection and replacement.
Implementation Method 1
a tensioner having a locked configuration for holding tension on the cable to support a weight of the user
Implementation Method 2
an open configuration for allowing the cable to pass through the tensioner
Data Source
AI summary
The invention is directed broadly to a ladder having a fall control system, comprising: a ladder; a tensioner mounted towards a bottom end of the ladder; a mount mounted towards a top end of the ladder; a cable that extends from the tensioner and over the mount in a looped configuration; and an arrestor movably engaged with the cable for coupling a user to the cable, wherein the tensioner has a locked configuration for holding tension on the cable to support a weight of the user and an open configuration for allowing the cable to pass through the tensioner.