Rescue Descender Pinch Bar Release Mechanism
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Solution Overview
Problem
Existing fall arrest and rescue systems require high force to release the load element during a fall, which can be challenging for users to manage, especially when the system needs to be released remotely or manually.
Innovation Solution
A descender device with a release element that secures through a loop or ring attached to a flexible line, featuring a restraint arrangement with movable pinch bars that clamp the descent line, allowing for easy deployment by reducing the force required to release the load element, enabling the user to be lowered safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release means is used to release the load element during a fall, then the system can enable rescue deployment, but a high force is required to effect release which challenges user operation
Solution Approach 1:
A tether is introduced as an intermediary element between the user and the release means. The tether transmits the user's pulling force to the release means, allowing the user to operate the release mechanism without directly handling the load element. This mediator approach enables remote activation and reduces the force requirement at the release point itself.
Solution Approach 2:
The system separates the load-bearing function from the release function. The load element remains engaged with the bracket during normal operation, while the tether provides a separate, low-force activation path. This segmentation allows the heavy load to be handled by the structural components while the user only needs to pull the lightweight tether.
2Device complexity
If the full load is passed via the release means, then the release mechanism can be simple, but a high force is necessary to effect release
Solution Approach 1:
The tether acts as an intermediary that bypasses the high-force requirement. Instead of pulling the load element directly, the user pulls the tether which then activates the release means. This maintains a simple release mechanism design while eliminating the need for high user force.
3Reliability
If remote release activation is implemented, then user safety is improved, but the release mechanism becomes more complex
Solution Approach 1:
The tether serves as a simple mechanical intermediary that enables remote activation without complex electronics or control systems. A rescuer can pull the tether from a distance to activate release, providing reliable remote operation while keeping the mechanical design straightforward.
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3b
AI summary
A descender device, typically for use in a fall arrest system, for enabling a suspended body to be lowered. The descender device includes a descent line and a release element to be actuated by a person. The release element is arranged in a restraint configuration to inhibit the descent line from being deployed and in a release configuration to permit the descent line to be deployed. The release element is connected to a pull tether, wherein the pull tether has a finger pull portion to be gripped by a user, and also, spaced from the finger pull portion, a second pull formation. The second pull formation can be accessed remotely from the user.