Linear-Motion Brake Assembly for Low-g Zipline Deceleration
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Solution Overview
Problem
Current braking systems for zip-lining often cause sudden deceleration, leading to potentially catastrophic injuries due to high g-forces, and may not be suitable for all environments where infrastructure is underdeveloped or inaccessible, necessitating a safer deceleration method that maintains control and reduces impact force.
Innovation Solution
A linear-motion brake system utilizing a compressible assembly and pulley assembly to decelerate users by transferring forces through a braking line, which compresses a linear-motion resistance assembly, reducing the impact force and allowing for controlled deceleration without encumbering the user's path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking system is added to control descent speed, then safety is improved, but the complexity of the system increases and may encumber the user's path
Solution Approach 1:
The patent introduces a braking line as an intermediary element that connects the user to the braking mechanism. This line acts as a mediator that transfers the braking force from the compressible assembly to the user's trolley, allowing the braking function to be implemented without direct mechanical connection that would encumber the user's path. The braking line enables the braking system to operate remotely and independently from the user's movement path.
2Speed
If a traditional braking system is used, then deceleration control is achieved, but sudden deceleration causes high g-forces and potential injuries
Solution Approach 1:
The patent employs a compressible assembly (such as springs or elastomeric elements) as a cushioning mechanism that absorbs and dissipates kinetic energy gradually. This cushioning element is positioned in the braking mechanism to compress during the deceleration process, extending the stopping distance and reducing the peak g-forces transmitted to the user. The beforehand cushioning prepares the system to mitigate impact forces before they reach the user.
Solution Approach 2:
The braking system utilizes dynamic elements including the compressible assembly that changes stiffness characteristics during compression, and the pulley system that dynamically adjusts mechanical advantage ratios. As the braking line is paid out and the compressible assembly compresses, the system's mechanical properties change to modulate the deceleration profile, preventing sudden force transmission and enabling controlled, progressive deceleration.
3Reliability
If the braking line is tripped early to allow controlled deceleration, then safety is improved, but the braking distance increases
Solution Approach 1:
The patent replaces traditional direct mechanical braking connections with a pulley-based mechanical advantage system. The pulley assembly multiplies the braking force generated by the compressible assembly, allowing effective deceleration over a longer distance without requiring excessive braking force. This mechanical substitution enables the braking line to be tripped early for safety while the pulley system ensures that the extended braking distance does not compromise deceleration effectiveness.
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 decelerates users at a steady pace, reducing injury and trauma while maintaining control, and can be adapted for various applications and configurations, ensuring safe and controlled descent on zip-lining systems.
Implementation Method 1
a compressible assembly to resist linear displacement... causing the compressible assembly to be compressed along a longitudinal axis
Implementation Method 2
a compressible assembly to resist linear displacement... reduces the impact force and allowing for controlled deceleration
Implementation Method 3
a pulley assembly to mechanically enhance the braking potential of the compressible assembly... enables forces exerted on the braking line to be transferred to the compressible assembly
Implementation Method 4
a braking line is tripped when the user enters a predetermined braking zone... A proportional length of the braking line is payed out as the compression assembly decreases in size
Data Source
AI summary
A linear-motion brake system uses a fixed block, a moving block, and a linear-motion resistance assembly to decelerate a user who is tethered to the system via a force-transfer line. The linear-motion resistance assembly is a compressible component that exerts a force on the force-transfer line that opposes the force generated by the user traveling along a zipline. The moving block and the fixed block are positioned on opposite sides of the linear-motion resistance assembly, such that the moving block compresses the linear-motion resistance assembly when impelled by the force-transfer line. The force transfer line is threaded through a pair of guide channels that run along the linear-motion resistance assembly. One end of the force-transfer line is tethered to the fixed block while the opposite end is tethered to the user. Thus, the user's motion is transferred to the moving block and resisted by the linear-motion resistance assembly.