Wire Net Bag Assembly for Higher Shock-Load Fall Arrest
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Solution Overview
Problem
Existing fall-arrest safety nets, such as those described in EP2256268B1, are satisfactory but require improvements in performance and manufacturing cost-effectiveness.
Innovation Solution
A safety net assembly with a wire net bag, a line system, a choker plate, and a fastener, featuring a noose loop and arcuate openings to enhance shock-loading capacity and manufacturing efficiency, along with an RFID tag for identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional safety net assembly with a simple line and bag is used, then the basic fall-arrest function is provided, but the shock-loading capacity is limited and manufacturing cost-effectiveness needs improvement
Solution Approach 1:
The safety net assembly is divided into distinct functional components: a bag for containing the fixture, a line for securing, a choker plate for attachment, and a fastener for locking. This segmentation allows each component to be optimized independently for its specific function, improving overall shock-loading capacity while maintaining manageable complexity through modular design.
Solution Approach 2:
The choker plate features arcuate openings with curved surfaces instead of sharp edges. This curvature distributes stress more evenly during shock-loading events, preventing stress concentration and improving the assembly's strength and durability under impact forces.
2Productivity
If traditional manufacturing methods are used for safety net assemblies, then basic production is achieved, but manufacturing cost-effectiveness and productivity need improvement
Solution Approach 1:
The choker plate incorporates an RFID tag that can be programmed with unique identification and tracking information. This enables automated identification and tracking during manufacturing and deployment, improving productivity through automated processes while reducing long-term costs through better asset management and reduced manual tracking requirements.
Solution Approach 2:
The fastener is designed to automatically lock when the line is tensioned, eliminating the need for manual locking operations during installation. This self-service feature reduces installation time and labor costs, improving both productivity and manufacturing cost-effectiveness.
3Strength
If the line passes through sharp-edged openings in the choker plate, then attachment is achieved, but the shock-loading capacity is reduced due to stress concentration
Solution Approach 1:
The openings in the choker plate are designed with arcuate surfaces and rounded edges instead of sharp corners. This curvature eliminates stress concentration points where the line passes through, significantly improving the assembly's shock-loading capacity while maintaining ease of operation as the rounded surfaces guide the line smoothly during installation.
Data Source
AI summary
A fall arrest safety net assembly has the form of a wire net bag constructed with a closed end and an opposing mouth drawn closed by a noose formed on a line by a running coupler fixed on one end of the line. A choker plate has two sides between which a plurality of openings extend openings that extend between the opposing sides. A line portion loops through the openings in the choker plate to secure the choker plate to the line outside the noose. A fastener fixed to the other end of the line is releasably fixable to the noose.