Active Trolley Support System for Fall Arrest
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Solution Overview
Problem
Existing fall arrest and support systems lack dynamic speed control and essential safeguards, such as braking capabilities, which can lead to inadequate protection during falls, especially in environments where users require moderate support for mobility.
Innovation Solution
A fall arrest system with a trolley braking mechanism, energy storage assembly, drum rotation sensor, and rope angle sensor, controlled by a controller to initiate braking and stop drum rotation, providing dynamic speed control and preventing horizontal movement upon detecting a fall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed height setting and spring-loaded or shock-cord system is used, then the system structure is simple, but the system lacks dynamic speed control and braking capability, resulting in inadequate fall protection
Solution Approach 1:
The system transitions from fixed height settings to dynamic height adjustment capability. The motorized drum and rope mechanism allow the trolley to be positioned at various heights along the track, enabling adaptive support based on user needs and fall scenarios. The controller dynamically adjusts system parameters in response to sensor inputs.
Solution Approach 2:
The patent replaces traditional mechanical spring-loaded or shock-cord systems with an active motorized system. The drum motor provides controlled winding and unwinding of the rope, replacing passive mechanical shock absorption with active, controllable force application. This substitution enables precise control over support forces and positioning.
2Reliability
If manual adjustment is required for height settings, then the system is simpler, but the system lacks automatic response to fall conditions and requires user intervention
Solution Approach 1:
The system incorporates sensors (rope angle sensor, drum rotation sensor) that continuously monitor system state and provide feedback to the controller. When a fall condition is detected through excessive rope angle or rapid drum rotation, the controller automatically activates the braking mechanism and adjusts drum rotation to prevent further harmful motion. This closed-loop feedback enables automatic response without manual intervention.
Solution Approach 2:
The system performs self-adjustment and self-protection functions. The controller automatically detects fall conditions, activates braking mechanisms, and adjusts rope tension without requiring user awareness or manual operation. The system monitors its own state through sensors and autonomously responds to protect the user.
3Reliability
If the trolley can move freely along the track, then the system allows user mobility, but the system cannot provide resistance to horizontal movement during falls
Solution Approach 1:
The braking mechanism operates periodically or intermittently rather than continuously. The controller activates the brake only when fall conditions are detected (excessive rope angle or drum rotation), allowing free movement during normal operation. This periodic braking provides resistance only when needed, maintaining ease of operation during normal use while ensuring safety during falls.
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 limits horizontal movement and provides resistance to assist users in righting themselves after a fall, ensuring safer mobility and fall protection with adjustable tension and controlled trolley motion.
Implementation Method 1
a brake member that is placed into frictional contact with the track in response to a braking signal
Implementation Method 2
an energy storage assembly, operatively connected to the drum, for storing energy as the rope is unwound therefrom and releasing energy as the rope is rewound thereon
Data Source
AI summary
A trolley for use with a fall arrest system, the trolley providing active control of both downward movement of a body attached to a rope or cable and horizontal position along a track.