Hinge Support Head Screws With T-Slot Burglary Resistance
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Solution Overview
Problem
Existing door hinges are vulnerable to burglary attempts as the screw holes are freely accessible when the pivot pin is removed, allowing burglars to exploit this gap to remove fastening screws using leverage.
Innovation Solution
The hinge design incorporates undercuts in the cups receiving the support head screws, forming T-slots that engage with the screws to create a robust locking mechanism, and features differently shaped shaft sections to enhance resistance against burglary tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pivot pin is removed to separate hinge components for maintenance or replacement, then the hinge parts become easily accessible, but the screw holes become freely accessible to burglars allowing them to remove fastening screws using leverage
Solution Approach 1:
The support head of the screw is segmented into two distinct parts: an upper shaft section with a first shape and a lower shaft section with a second shape. This segmentation allows each section to serve different functions - the upper section interfaces with the T-slot for positioning, while the lower section provides resistance against burglary tools attempting to lever the screw out.
Solution Approach 2:
The screw shaft is designed with asymmetric geometry, featuring differently shaped shaft sections. The upper shaft section has a shape that fits the T-slot configuration, while the lower shaft section has a different shape optimized for anti-burglary resistance. This asymmetric design prevents burglary tools from effectively engaging with the screw, as the tool would need to accommodate multiple conflicting geometric requirements.
2Device complexity
If traditional screw holes are used without additional locking features, then the hinge structure remains simple, but the screws can be easily removed by burglars through the joining gap
Solution Approach 1:
The T-slot acts as an intermediary locking mechanism between the support head screw and the hinge part. The T-slot receives the upper shaft section of the support head, creating a positive locking engagement that prevents the screw from being pulled out. This intermediary structure adds security without requiring complex additional components, as the T-slot is integrated into the existing hinge part geometry.
Data Source
AI summary
In a hinge joint comprising at least two joint sections, a pivot bolt pivotally connecting the joint sections, and at least two support screws, at least one of the joint sections has a contact surface in which at least two cups are formed to receive the support heads of the support screws. The depth of the cups is greater than the height of the support heads, and each cup has at least one undercut extending from its contact surface. The undercuts of the cups serve as receiving areas for at least partially receiving the support heads of the support screws.