Auto-Return Zip Line Trolley with Spring-Loaded Sheave
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Solution Overview
Problem
Existing zip line trolley systems lack automatic return functionality and remote control capabilities, making the return of the trolley to the high point time-consuming and inefficient.
Innovation Solution
An auto-return zip line trolley assembly with a remote-controlled drive wheel that disengages from the cable when a load is present, allowing the trolley to ride freely downhill, and re-engages with motor-powered propulsion to return uphill, utilizing a spring-loaded sheave subassembly for automated engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual pushing or drag line is used to return the trolley to the high point, then the trolley can be returned to the starting point, but the operation is time-consuming and labor-intensive
Solution Approach 1:
The trolley system performs its own return operation automatically through the drive wheel engaging the cable and motor propulsion, eliminating the need for manual pushing or separate retrieval devices. The system serves itself by using the cable tension and motor power to return the trolley to the high point without human intervention.
Solution Approach 2:
The manual mechanical operation of pushing the trolley or using drag lines is replaced with an automated motor-powered drive wheel system. The motor provides automated propulsion along the cable, substituting manual labor with mechanical automation to reduce time and effort required for trolley return.
2Ease of operation
If the drive wheel is always engaged with the cable, then motor-powered propulsion is available, but the trolley cannot ride freely downhill with load
Solution Approach 1:
The drive wheel engagement is made dynamic rather than static. The spring-loaded sheave subassembly automatically adjusts the engagement state based on operational conditions: disengaging when the trolley needs to ride freely downhill with load, and engaging when motor-powered propulsion is needed for the return trip. This dynamic adjustment optimizes both free-riding capability and return efficiency.
Solution Approach 2:
The spring-loaded sheave subassembly automatically manages the engagement and disengagement of the drive wheel based on the trolley's operational state and load conditions, eliminating the need for manual intervention to adjust engagement. The system self-regulates to provide optimal performance for both downhill free-riding and uphill motorized propulsion.
3Productivity
If the trolley is disconnected and transported back to the top, then the trolley can be returned to the high point, but equipment handling and safety risks increase
Solution Approach 1:
The manual handling and transportation of the trolley back to the high point is replaced with an automated motor-powered drive wheel system that propels the trolley along the cable. This substitution eliminates the need for disconnecting and manually transporting the trolley, thereby improving return speed while enhancing operational safety by removing human handling from the process.
Solution Approach 2:
The trolley system automatically returns to the high point through motor-powered propulsion along the cable, eliminating the need for external transportation equipment and manual handling. The system serves itself by using the cable infrastructure and motor power to retrieve and reposition the trolley, reducing safety risks associated with manual equipment handling.
4Productivity
If a separate retrieval device is used to pull the trolley uphill, then the trolley can be returned to the high point, but device complexity and equipment requirements increase
Solution Approach 1:
The drive wheel and cable engagement mechanism are integrated into the trolley assembly itself, merging the return function with the existing trolley structure. This eliminates the need for separate retrieval devices and reduces overall system complexity by combining multiple functions (transport, engagement, propulsion) into a single integrated trolley unit.
Solution Approach 2:
The drive wheel and motor system provide multiple functions: they enable motor-powered propulsion for the return trip, automatically engage and disengage from the cable based on operational needs, and eliminate the requirement for separate retrieval devices. This multi-functionality reduces device complexity by consolidating multiple operations into a single versatile mechanism.
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
Enables efficient, automated, and remote-controlled travel of the trolley between high and low points, reducing operational time and eliminating the need for manual handling, while ensuring safety and reducing equipment changes.
Implementation Method 1
a spring-loaded sheave subassembly disposed inside the interior cavity of the housing, the spring-loaded sheave subassembly comprising a front sheave, the front sheave configured to engage the cable, the front sheave further being configured to pivot between an engage position for urging the cable into engagement with the drive wheel, and a disengage position for urging the cable into disengagement from the drive wheel
Implementation Method 2
a motor operatively connected to the drive wheel, the motor configured to rotatably drive the drive wheel; whereby the drive wheel drives the housing along the cable when engaged with the cable
Implementation Method 3
the vehicle rides freely from a high point to a low point on the cable
Data Source
AI summary
An auto-return zip line trolley provides a vehicle that rides a suspended cable between a low point and a high point. The vehicle is urged along the cable by a remote-controlled drive wheel. A motor drives the drive wheel to roll along the cable, when engaged. When a load is applied to the vehicle, a spring-loaded sheave subassembly urges the cable away from the drive wheel, such that the vehicle rides freely from a high point to a low point on the cable. When the load is removed from the vehicle, the spring-loaded sheave subassembly urges the cable into engagement with the drive wheel to enable motor-powered propulsion of the vehicle from the low point to the high point of cable. A receiver inside the housing is in operational communication with the motor. A transmitter transmits a control signal to the receiver for regulating power and speed of the motor.