Gravity Friction Descent Device for Emergency Egress
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Solution Overview
Problem
Emergency responders, such as firefighters and military personnel, face challenges with existing descent control devices that are prone to failure in debris-filled environments and do not meet stringent safety standards, particularly during rapid and safe egress from heights, due to bulky gloves and limited tactile awareness, and existing devices often have failure-prone moving parts or are too bulky and costly.
Innovation Solution
A Type 2 Auto Brake/Hand Control Descent device, named 'Core', which uses gravity and rope threading to achieve auto braking without moving parts, ensuring reliability and safety by locking upon load release and allowing controlled descent, meeting NFPA 1983 standards with a lightweight and intuitive design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing descent control devices with moving parts are used, then they can provide controlled descent, but they are prone to failure in debris-filled environments and have reliability issues
Solution Approach 1:
The patent removes all moving parts from the descent control device, extracting the problematic mechanical components that are susceptible to debris interference. The device uses a fixed friction surface with a rope threaded through it, eliminating pistons, springs, and other moving elements that could fail in debris-filled environments.
Solution Approach 2:
The patent replaces the traditional mechanical system with moving parts with a gravity-based friction system. The rope passes through a hollow friction surface, and friction between the rope and the fixed surface provides controlled descent without requiring any moving mechanical components.
2Ease of operation
If Type 1 hand brake descent devices are used, then they provide descent control, but the user must continuously hold onto the rope which is difficult with bulky firefighter gloves
Solution Approach 1:
The device performs the braking function automatically through its fixed friction surface design. The user simply needs to thread the rope through the device and release it; the friction surface automatically engages with the rope to provide controlled descent without requiring continuous manual manipulation or tactile feedback.
3Extent of automation
If Type 3 auto brake/auto control descent devices are used, then they provide automatic descent control, but they are bulky, costly, and have failure-prone moving parts
Solution Approach 1:
The patent extracts all moving parts from automatic braking devices, achieving automatic braking through a fixed friction surface that requires no mechanical movement. The simplicity of the design eliminates complexity while maintaining automation.
Solution Approach 2:
The patent replaces complex mechanical automatic braking systems with a simple gravity-based friction system. The fixed friction surface, combined with the user's weight, provides automatic braking without requiring complex mechanical linkages, springs, or moving components.
4Reliability
If figure eight descenders are used, then they provide fixed friction descent control, but they put kinks and twists in the rope
Solution Approach 1:
Instead of threading the rope through a figure-eight pattern that creates kinks and twists, the patent inverts the approach by having the rope pass straight through a hollow friction surface. This linear path prevents rope deformation while maintaining friction-based control.
5Duration of action of moving object
If rack descenders are used, then they provide variable friction for long descents, but they are significantly bulkier and heavier than figure eights
Solution Approach 1:
The patent replaces the heavy mechanical rack system with a lightweight fixed friction surface. The friction-based mechanism provides sufficient control for extended descents without requiring the bulky rack structure, significantly reducing device weight.
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 Core device provides a reliable, safe, and intuitive means for emergency responders to control their descent, preventing falls and meeting stringent safety standards, even in debris-filled environments, by using gravity for auto braking and ensuring rope control without the need for user manipulation under load.
Implementation Method 1
The unique feature of the Core is that it does not use any moving parts to make the auto breaking work. The absence of moving parts prevents damage and operational failure in the presence of debris, dirt, sand, or other potential impediments are present... It is the first to use gravity alone—i.e., the user's weight and threading of the rope into the device—to accomplish the auto breaking.
Implementation Method 2
In principle, all descent control devices (aka 'descenders') use friction in one or another manner to control the rate of descent when using a rope to lower equipment or people.
Implementation Method 3
When the device is manipulated in some fashion via a lever or motion, the rope will be free to move depending on the user controlling the rope release.
Data Source
AI summary
A descent control device to facilitate rapid descent and abseil (rappelling) maneuvers, including a body, a handle integrally affixed to the body to define a longitudinal axis for the device, an attachment lug disposed on the body, and a combination of through holes through the body through which a safety line is threadably inserted in a specific pattern, and shallow channels between the through holes, thereby giving rise to configurations that allow the safety line to payout freely through the descent device, to be locked in relation to the descent device, or to payout in a controlled pace, all configurations depending on the orientation of the longitudinal axis of the device to the anchored upper portion of the safety line.