Roller Belt Door Hinge With Undercut Locking Elements
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Solution Overview
Problem
Conventional roller hinges for doors lack sufficient security against unauthorized access and criminal attacks, as they can be easily lifted or removed from the frame, compromising the door's ability to secure a building effectively.
Innovation Solution
The introduction of additional connecting parts with plug-in heads having undercuts and corresponding plug-in depressions in the frame hinge part, along with locking elements transverse to the plug-in direction, enhances the anchoring of the frame hinge part to the door frame, making it more difficult to lift or remove, thereby increasing security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional roller hinges are used with simple connecting means, then the device complexity is low and ease of manufacture is high, but the security against unlawful attack and resistance to lifting is insufficient
Solution Approach 1:
The connecting means are divided into separate functional components: plug-in heads with undercuts, plug-in depressions, and locking elements. This segmentation allows each component to perform its specific function (insertion, positioning, and securing) while collectively providing enhanced security without requiring a completely new integrated design.
Solution Approach 2:
The plug-in heads are designed with undercuts in advance, and the locking elements are pre-configured to engage with these undercuts. This preliminary preparation of the connecting structure ensures that when assembly occurs, the security features are automatically activated, providing reliable anti-lifting protection without requiring additional steps during installation.
2Strength
If additional connecting parts with locking elements are added to the frame hinge part, then the anchoring strength and resistance to lifting increase, but the ease of manufacture and installation decrease
Solution Approach 1:
The locking elements are designed to nest within the structure formed by the plug-in heads and plug-in depressions. The locking elements engage with the undercuts of the plug-in heads, creating a nested configuration where smaller components fit within larger structural elements. This nesting approach maximizes anchoring strength while minimizing the overall space required and reducing material usage.
Solution Approach 2:
The plug-in heads feature asymmetric undercuts that correspond to the asymmetric shape of the locking elements. This asymmetric design ensures proper orientation and engagement during assembly, preventing incorrect installation while providing robust mechanical interlocking. The asymmetric geometry creates a unique fit that enhances manufacturing precision and assembly reliability.
Data Source
Figure 1
Figure 2
AI summary
In a roller hinge for plastic or wooden doors, comprising a hinge section that can be positioned on the door leaf and a hinge section that can be positioned on the door frame, and wherein the hinge section can be attached to the frame by means of connecting elements, the connecting elements include additional connecting parts with insertion heads, each having an undercut, and the hinge section has insertion recesses for the insertion heads, to which locking elements for the inserted insertion heads are arranged approximately transversely to the insertion direction. Such a roller hinge is better secured against unauthorized access.