Roller Shutter Anti-Lift Latch With Segmented Slat Actuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing closure devices, such as rolling shutters and blinds, are vulnerable to lifting by criminals due to a flaw in their anti-lifting systems, which can be bypassed by exerting downward traction on the final slat, rendering the security feature ineffective.
Innovation Solution
The closure device incorporates a pivoting latch system with a means to push the latch back into an unlocking position, utilizing a first and second slat part that move relative to each other, ensuring the anti-lifting system is activated during deployment or folding, and deactivated during complete deployment, thus preventing unauthorized lifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional anti-lifting system with a latch and cam track is used, then the system provides lifting prevention capability, but the system can be bypassed by criminals exerting downward traction on the bottom slat to cause additional deployment and disengage the latch
Solution Approach 1:
The bottom slat is divided into two separate parts: a first slat part and a second slat part. The first slat part is connected to the means for pushing the latch back, while the second slat part is connected to the attachment member. This segmentation ensures that downward traction on the second slat part cannot simultaneously disengage the latch, as the first slat part remains engaged with the latch pushing mechanism.
Solution Approach 2:
The system is designed so that the latch is pushed into the locking position by the means for pushing the latch back, which is connected to the first slat part. This preliminary engagement ensures that even if downward traction is applied to the second slat part, the latch remains engaged and prevents lifting before the criminal can execute their plan.
2Reliability
If the latch is always engaged with the attachment member, then lifting prevention is maximized, but the concealment element cannot be deployed or folded
Solution Approach 1:
The latch is designed to pivot between a locking position and an unlocking position. During deployment and folding operations, the latch pivots to the unlocking position, allowing the concealment element to move freely. When lifting is attempted, the latch pivots back to the locking position to engage with the attachment member and prevent lifting. This dynamic positioning resolves the contradiction between security and operational flexibility.
Solution Approach 2:
The latch alternates between locked and unlocked states during normal operation. The means for pushing the latch back periodically engages the latch in the locking position during deployment and folding, then disengages it to allow movement. This periodic engagement and disengagement enables both security during static periods and operational freedom during movement periods.
Data Source
Figure 1~2
Figure 3~4
Figure 5~5c
AI summary
The device (1) has an anti-lifting system comprising a latch that is mounted pivotingly on an inner wall of a lateral slide (4) between unlocking and locking positions. The latch co-operates with a hooking unit of the system to prevent lifting of a covering element (2), in the locking position. A pushing unit pushes the latch from the locking position towards the unlocking position under impulsion of displacement of slats (20, 22) of the covering element. The slats have two parts that are movable relative to each other and are respectively provided with the pushing and hooking units.