Zip Line Trolley Brake Pad With Transverse Grooves
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Solution Overview
Problem
Existing downhill zip line systems rely on rider-manipulated friction to control descent speed, which can be unsafe and prone to premature trolley failure, especially for heavier riders, due to the lack of a reliable and low-maintenance braking mechanism.
Innovation Solution
A zip line trolley with a stainless steel main pulley and a brake pad that applies force by suspending the rider behind the pulley, featuring a pivotally mounted brake pad with transverse grooves for water removal and rotation-limiting bolts for continuous contact, along with auxiliary pulleys for fail-safe operation and a rugged frame design for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rider-manipulated friction is used to control descent speed, then the system structure is simple, but safety and reliability deteriorate due to rider error and premature trolley failure
Solution Approach 1:
The brake pad automatically applies friction to the cable through the rider's weight and geometry of the trolley, eliminating the need for rider manipulation. The system serves itself by converting the rider's gravitational force into braking action through the pivotal brake pad mechanism, ensuring consistent safety without rider intervention.
Solution Approach 2:
The patent replaces the manual rider-controlled friction system with an automated mechanical braking system. The brake pad, pivotally mounted on the trolley frame, automatically engages the cable through mechanical leverage created by the rider's suspension position, substituting human control with reliable mechanical automation.
2Force
If heavier riders use the friction-based system, then more friction force is generated for speed control, but trolley failure increases due to excessive heat and wear
Solution Approach 1:
The brake pad is designed with specific local properties - it is pivotally mounted to allow automatic adjustment and maintains optimal contact with the cable. The localized braking action at the brake pad-cable interface concentrates the friction force efficiently, preventing excessive heat generation in the trolley pulley while maintaining adequate braking force for all rider weights.
Solution Approach 2:
The system changes the parameter of friction application from uncontrolled rider-manipulated friction to controlled mechanical friction through the brake pad. By adjusting the brake pad's pivotal mounting and the rider's suspension position, the system optimizes the friction force parameter to be sufficient for speed control without generating excessive heat that would compromise trolley durability.
3Reliability
If a brake pad system is implemented, then safety and speed control improve, but device complexity increases
Solution Approach 1:
The brake pad is integrated into the trolley frame structure itself, merging the braking function with the support structure. The brake pad, main pulley, and rider suspension point are combined into a unified trolley assembly, eliminating separate braking components and reducing overall system complexity while maintaining safety.
Solution Approach 2:
The trolley frame serves multiple functions: it supports the rider's weight, positions the main pulley on the cable, mounts the brake pad, and provides the geometric leverage for automatic braking. This multi-functionality eliminates the need for separate dedicated braking mechanisms, maintaining simplicity while ensuring safety.
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
Ensures reliable, safe, and low-maintenance speed control for riders by converting kinetic energy into heat through controlled friction, reducing the risk of trolley failure and enhancing safety and operational longevity.
Implementation Method 1
Force applied by the brake pad against the cable... Kinetic energy is, thus, dissipated as heat
Implementation Method 2
The main pulley rotates on a pair of sealed ball bearing races
Implementation Method 3
The brake pad, which is equipped with transverse grooves which wipe water from the suspended cable
Data Source
AI summary
A zip line trolley includes a frame assembled from a pair of spaced-apart parallel side plates and an inner beam, which is partially sandwiched between the side plates. The inner beam has a gallery of block-T-shaped cross section which extends its length. A shackle, from which a rider is suspended, can be pinned anywhere within the gallery. A main pulley, which is installed in an upper middle portion of the frame, rotates on a pair of sealed ball bearing races that are pressed on a hollow keyed shaft which slides into opposed grooves machined into each of the side plates. The keyed shaft is bolted between the side plates with a shoulder bolt passing transversely through both side plates. A water-wiping brake pad is pivotally mounted within the frame in front of the main pulley. A bumper is bolted between front portions of the side plates.