Wire Net Bag Closure With Choker Plate for Fall Arrest Loads
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Solution Overview
Problem
Existing fall arrest safety nets are in need of improvements in performance and manufacturing cost-effectiveness, particularly for securing overhead fixtures in construction environments.
Innovation Solution
A safety net assembly with a wire net bag featuring a choker plate and a line system that includes a running coupler and a fastener, allowing for secure closure and reduced impact loads, along with an RFID tag for identification and asset management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional drawstring closure is used to close the bag mouth, then the structure is simple and easy to manufacture, but the impact loads during fixture enclosure are high and the closure reliability is insufficient
Solution Approach 1:
The patent introduces a choker plate as an intermediary component between the line and the bag mouth. The choker plate with its aperture receives the line and works with the running coupler to create a mechanical locking system that distributes and reduces impact loads, thereby improving closure reliability without requiring complex multi-component assemblies.
Solution Approach 2:
The running coupler mechanism is designed to absorb and distribute impact loads before they can fully transmit to the bag structure. The mechanical advantage provided by the running coupler system cushions the shock of sudden loads during fixture enclosure, protecting the overall assembly from damage.
2Strength
If a secure mechanical closure system is implemented to reduce impact loads, then the load ratings improve and safety increases, but the manufacturing cost and process complexity increase
Solution Approach 1:
The closure system is segmented into distinct functional components: the choker plate for structural support and load distribution, the running coupler for mechanical advantage and shock absorption, and the line for closure action. This segmentation allows each component to be optimized and manufactured separately using standard processes, then assembled through straightforward procedures.
Solution Approach 2:
The choker plate serves multiple functions: it provides structural support for the bag mouth, distributes impact loads across a wider area, guides the line through its aperture, and works with the running coupler to create the mechanical locking system. This multi-functionality reduces the need for additional specialized components, simplifying manufacturing.
3Reliability
If the line is routed through multiple components (running coupler and choker plate) to reduce impact loads, then the shock absorption improves, but the time required to enclose and secure fixtures increases
Solution Approach 1:
The running coupler mechanism is designed to be self-adjusting and self-locking. As the line is pulled through the choker plate aperture, the running coupler automatically creates mechanical advantage and locks into position, providing shock absorption without requiring additional manual adjustments or complex sequencing steps by the operator.
Data Source
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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.