Hinge with Support Head Screws and Undercut Cups
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Solution Overview
Problem
Existing door hinges lack sufficient burglary resistance, as the pivot pin can be removed only when the door is open, allowing burglars to exploit the joint gap to manipulate screws and compromise the door's security.
Innovation Solution
The hinge design incorporates pots with undercuts and locking pins, where the support head screws engage with the undercuts and T-slots, creating a resilient lock that increases resistance to burglary tools, and features a two-part pivot pin bearing and countersunk screw holes for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pivot pin is made removable to allow hinge assembly disassembly, then the ease of manufacture and assembly is improved, but the burglary resistance deteriorates because burglars can exploit the joint gap to manipulate screws
Solution Approach 1:
The hinge is divided into multiple functional components: band parts for mounting, pivot pin for rotation, support head screws for fastening, and cups with undercuts for securing the support heads. This segmentation allows each component to perform its specific function while collectively providing security when assembled.
Solution Approach 2:
The support heads of the support head screws are nested within the cups formed in the band parts. The cups have undercuts that engage with the support heads, creating a nested structure where the support heads are partially received in the cups. This nesting prevents the support heads from being easily accessed or manipulated by burglars through the joint gap.
2Ease of operation
If the screw holes are positioned to allow hinge assembly together, then the ease of operation is improved, but the burglary resistance deteriorates because the screw holes become accessible when the hinge parts are separated
Solution Approach 1:
The cups with undercuts are pre-formed in the band parts at specific positions. When the hinge assembly is put together, the support heads of the support head screws are automatically engaged by the undercuts of the cups, preliminarily securing them before final tightening. This preliminary action ensures that even if the hinge parts are separated, the support heads remain constrained within the cup structures.
Solution Approach 2:
The cups act as intermediary structures between the band parts and the support heads of the support head screws. These cups with undercuts provide an intermediate securing mechanism that prevents direct access to the support heads, thereby mediating between the need for easy assembly and the requirement for burglary resistance.
3Device complexity
If the hinge parts are designed with simple mounting structures, then the device complexity is reduced, but the burglar-resistant effect deteriorates
Solution Approach 1:
The cups with undercuts are formed locally in the band parts at specific positions where the support heads of the support head screws will engage. This local quality enhancement provides increased burglar resistance only where needed (at the screw engagement points) without requiring complex structures throughout the entire hinge assembly. The local undercuts create form fit locking exactly where the support heads are positioned.
Solution Approach 2:
The mounting structure merges multiple functions into a unified design: the cups serve both as mounting features for the support heads and as security elements with undercuts that prevent tool insertion. The support head screws simultaneously provide fastening and, when combined with the cup undercuts, create a burglar-resistant connection. This merging eliminates the need for separate complex security mechanisms.
Data Source
Figure 1
AI summary
The hinge band according to the invention is characterized in that the depth of the cups is greater than the height of the support heads of the support head screws, that the cups, starting from their contact surface, each have at least one undercut, that the undercuts of the cups are designed as receiving areas for at least partial reception of the support head screws, that the band part containing the cups has at least one transverse bore with which the pot wall of at least one of the cups is traversed outside its undercut, and that a locking pin for locking a support head received in its cup is assigned to the transverse bore.