Retractable Screen Link Chain Anti-Disassembly Design
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Solution Overview
Problem
Existing retractable screen devices with rigid elements or chains suffer from dirt accumulation in surface nooks and insecure link binding, leading to potential disassembly during operation.
Innovation Solution
A link chain design featuring parallel side walls, a cylindrical axis, and specific geometric features that allow only one-directional rotation and limited angle of rotation, along with flanges and limit surfaces for secure assembly and anti-disassembly prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional chain links with open structures are used, then the chain allows free rotation and assembly, but dirt accumulates in nooks and surfaces and the binding security is weak
Solution Approach 1:
The link is divided into distinct functional zones: a binding zone with hook and cylindrical axis for secure connection, and a smooth outer surface zone that minimizes dirt accumulation. The internal structure is segmented into binding elements (hook, axis) and limiting elements (flanges, vertical step) that are hidden within the link body, exposing only smooth surfaces externally.
Solution Approach 2:
The link design employs asymmetric geometry where the internal binding structures (hook opening, cylindrical axis) are positioned to create secure articulation while the external surfaces remain smooth and symmetric. The flanges and vertical step create asymmetric internal constraints that limit rotation to one direction only, preventing disassembly while maintaining smooth external profiles.
2Reliability
If traditional open link structures are used, then assembly is simple, but the binding security is weak and links can lose during operation
Solution Approach 1:
Multiple functions are merged into a single link body: the hook and cylindrical axis for binding, the flanges for rotation limiting, and the vertical step for directional control are all integrated into one unified structure. This consolidation provides secure binding and operational control without requiring multiple separate components or complex assembly procedures.
3Reliability
If links allow free rotation in both directions, then the chain is flexible, but links can disassemble during operation
Solution Approach 1:
The vertical step and flange geometry are designed to preemptively prevent reverse rotation before disassembly can occur. When the chain reaches its intended rotation limit, the vertical step of one link contacts the flange of the adjacent link, creating a mechanical stop that prevents further rotation in the disassembly direction. This preliminary geometric constraint ensures links remain bound during operation while allowing flexibility in the permitted rotation direction.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Link chain for retractable screens for easy assembly which has limited the direction of the rotation thanks to a first flange (2), located on the rear top of the links (1) and a second flange (6), located on the front top of the links (1) such that when both flanges come into contact they avoid the link chain to rotate in that direction. Also the links (1) incorporate a vertical step (5) on its inner side by which a inclined vertical side (7) of an adjacent link slides in such a way that the chain can only be rotated a certain angle marked by the contact of the inclined vertical side (7) of a link and the vertical step (5) of the adjacent link. Links (1) include a front limit surface (10) and a rear limit surface (11), which are flexible in order to facilitate the assembly of the chain.