Push-Link Chain Anti-Lift Mechanism for Roller Shutters
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Solution Overview
Problem
Existing roller shutter designs lack robustness against forced opening, particularly when the shutter shaft is held in a rotationally fixed position.
Innovation Solution
A push-link chain with articulated chain links and a traction element is used to connect the shutter curtain to the shaft, allowing the chain links to interlock and transmit both tensile and thrust forces, preventing the shutter from being pushed open by interlocking when the shaft is fixed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional roller shutter design is used, then the structure is simple and easy to manufacture, but the robustness against forced opening is insufficient
Solution Approach 1:
The push-link chain is divided into multiple articulated chain links that can independently pivot and interlock. Each chain link acts as a separate segment that contributes to the overall anti-lift function through sequential engagement, transforming a simple rigid connector into a sophisticated force-transmitting mechanism that resists forced opening while maintaining manageable complexity
Solution Approach 2:
The anti-lift device combines the push-link chain with the roller shutter curtain and shaft into a composite system. The chain links integrate multiple functions: connecting the curtain to the shaft, transmitting both tensile and thrust forces, and providing interlocking protection. This composite approach achieves enhanced robustness without proportionally increasing device complexity
2Force
If the push-link chain uses rigid connections, then the force transmission is efficient, but the chain cannot accommodate movement during winding
Solution Approach 1:
The chain links are designed with articulated pivoting joints that dynamically adjust during operation. During winding, the links pivot to accommodate the curvature and movement of the curtain onto the shaft. During forced opening attempts, the links interlock to transmit thrust forces. This dynamic behavior allows the same structure to fulfill both movement accommodation and efficient force transmission requirements
Solution Approach 2:
The chain links change their geometric parameters (pivot angle, relative position) depending on the operational state. When the shutter is normally wound or unwound, the links maintain a flexible configuration that accommodates movement. When subjected to forced opening, the links transition to an interlocked configuration that maximizes force transmission. This parameter change enables the chain to adapt its mechanical properties to different operational demands
Data Source
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Figure 2
AI summary
As an anti-lift device (5) for a roller shutter (1), the invention proposes a push-link chain (4) that connects a roller shutter curtain (3) to a roller shutter shaft (2). This chain transmits a compressive force from the roller shutter shaft (2) to the roller shutter curtain (3), which protects the roller shutter (1) against being pushed open when the roller shutter shaft (2) is held in a rotationally fixed position. A metal band as a tension member (20), which is guided through a channel (19) passing through chain links (6, 16, 61) in a longitudinal direction of the push-link chain (4), relieves the chain links (6, 16, 61) of the push-link chain (4) from a tensile force when the roller shutter (1) is wound onto the roller shutter shaft (2).