Folding Rail Assembly With Coupling And Locking Hooks
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Solution Overview
Problem
Existing folding rail assemblies for scaffolds lack an efficient and effective solution for fall protection, particularly in ring scaffold systems with rosettes, as they are difficult to fasten safely from a lower scaffold level and require longer posts that complicate handling and material usage.
Innovation Solution
A folding rail assembly with hingedly connected upper and middle rail parts, featuring a coupling hook structure and locking hook structure, allows for easy and secure suspension and locking from rosettes, enabling compact and lightweight design with shorter posts, facilitating easy handling and reliable fastening from a lower scaffold level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a folding rail assembly is designed with longer posts to reach from lower scaffold level, then the coupling can be achieved from lower level, but the assembly becomes heavier and more complex to handle
Solution Approach 1:
The coupling mechanism is divided into two separate functional components: a coupling hook structure for initial attachment and a locking hook structure for securing the position. This segmentation allows each component to be optimized independently, with the coupling hook being compact and the locking hook positioned to engage with the rosette from the lower scaffold level without requiring excessively long posts.
Solution Approach 2:
The locking hook structure is designed to operate in a different spatial dimension by engaging with the rosette through a rotational movement around the standard rather than requiring vertical reach. This dimensional change allows workers on the lower scaffold level to secure the assembly without needing posts that extend vertically to upper levels.
2Weight of moving object
If posts are made shorter to save material and reduce weight, then the assembly becomes more compact and lighter, but it becomes difficult to fasten from lower scaffold level
Solution Approach 1:
The coupling hook structure serves as an intermediary mechanism that bridges the gap between the shorter post and the rosette on the standard. It enables initial attachment from the lower scaffold level, after which the locking hook structure secures the position, effectively allowing short posts to function as if they were longer.
3Loss of substance
If the folding rail assembly is designed for compact and lightweight construction, then material usage is reduced and handling is easier, but the coupling and locking mechanisms become more challenging to implement reliably
Solution Approach 1:
The coupling mechanism is divided into two separate functional components: a coupling hook structure for initial attachment and a locking hook structure for securing the position. This segmentation allows each component to be optimized independently, with the coupling hook being compact and the locking hook positioned to engage with the rosette from the lower scaffold level without requiring excessively long posts.
Solution Approach 2:
The design changes the geometric parameters of the hook structures and their relative positions to achieve reliable coupling and locking with minimized material. The coupling hook is positioned and dimensioned to engage the rosette opening, while the locking hook is positioned to engage the rosette at a different location, creating a reliable mechanical interlock with minimal post length.
Data Source
AI summary
Folding rail assembly for a scaffold, comprising an upper rail part, a middle rail part, a first post, and a second post which are mutually hingedly connected for adjusting between a folded-in configuration and a folded-out configuration. The first post is provided with a coupling hook structure to suspend the first post from a rosette of a standard of the scaffold in an opening of the rosette with play. At the coupling hook structure a locking hook structure is provided which is configured for, depending on a rotation position of the locking hook structure relative to the rosette, counteracting the first post, by moving up, being brought out of its state suspended from the rosette. By rotation of the rail assembly around a rotation axis parallel to the standard, the locking hook structure can be brought in a locking position to counteract the suspended post coming loose.