Fall Arrest Safety Block Lateral Exit Slot Design
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Solution Overview
Problem
Existing fall arrest systems experience high friction at the safety line exit, leading to wear and jarring effects during normal use and fall arrest events due to the line exiting directly below the attachment point, which can cause the device to sway and increase loading on the exit.
Innovation Solution
The safety block features an arcuate slot for the safety line exit positioned to one side of the device when suspended, allowing the line to exit laterally, reducing friction and enabling the device to move independently during a fall arrest, thus minimizing jarring and wear on the line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the safety line exits directly below the attachment point, then the device structure is simple, but friction and wear on the safety line increase
Solution Approach 1:
The patent changes the exit arrangement from a vertical configuration (directly below attachment point) to a lateral configuration (to one side of the device). This dimensional change in the exit position eliminates the line passing through the swing arc, reducing friction and wear while maintaining structural simplicity
2Device complexity
If the safety line exits directly below the attachment point, then the exit arrangement is simple, but jarring effects and loading on the exit increase during fall arrest
Solution Approach 1:
By repositioning the exit arrangement laterally to one side of the device rather than directly below the attachment point, the safety line exits outside the swing arc path. This prevents the line from experiencing jarring effects and excessive loading during fall arrest events, while keeping the exit arrangement structurally simple
3Ease of operation
If the device is suspended with line exit below attachment point, then suspension is straightforward, but device swaying increases during use
Solution Approach 1:
The patent positions the exit arrangement laterally to one side of the device, changing from a vertical alignment to a side-mounted configuration. This allows the device to stabilize without swaying during use, while suspension remains straightforward through the attachment eye at the upper portion
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
This configuration reduces friction and wear on the safety line, enhances user safety by minimizing jarring effects during falls, and allows the device to stabilize without swaying, improving the overall performance of the fall arrest system.
Implementation Method 1
an energy absorber device arranged to be activated if a load above a predetermined threshold is deployed when the speed responsive mechanism is deployed. The energy absorber devices are typically either friction brake devices or plastically deformable metallic strip arrangements that are plastically deformed during deployment in order to absorb energy
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A safety device, such as a safety block, for use in a fall arrest system, has an exit arrangement for the safety line exiting the device; the exit arrangement being arranged to permit the safety line to exit the device over a range of different exit positions. The exit arrangement may be in the form of an elongate slot. When the safety line rewinds into the line drum, the position at which the line exits the slot may move along the slot.