Concealed Door Hinge Locking for Tamper-Resistant Disassembly
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Solution Overview
Problem
Existing hinges for aluminum clad wood doors/windows are often mounted on the outer aluminum surface, making them vulnerable to unauthorized disassembly and compromising security, as they can be easily tampered with from the outside.
Innovation Solution
A 2D adjustable hinge design with a central pivot axis and three bearing tubes, featuring locking mechanisms that prevent unauthorized disassembly by ensuring access to adjustment screws is restricted when the door/window is closed, including a locking screw and safety grub screws that can only be accessed when the door is open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the hinge is mounted on the outer aluminum surface for easy installation, then the installation process is simplified, but the hinge becomes vulnerable to unauthorized disassembly and tampering
Solution Approach 1:
Instead of mounting the hinge on the outer aluminum surface as conventionally done, the invention inverts the mounting location to the inner wooden surface behind the aluminum cladding. This reversal maintains installation simplicity while simultaneously preventing unauthorized access to adjustment screws and fixation elements, as they are no longer accessible from the outside.
2Ease of operation
If the hinge allows easy adjustment access for maintenance, then adjustment operations are simplified, but the hinge becomes vulnerable to unauthorized tampering when the door is closed
Solution Approach 1:
The invention applies dynamics by making the accessibility of adjustment screws conditional on the door's state. When the door is closed, the adjustment screws are positioned in a location that is inaccessible from the outside. When the door is opened, the screws become accessible for authorized adjustment operations. This dynamic positioning resolves the contradiction between ease of operation and protection against unauthorized tampering.
3Strength
If the hinge uses visible fixation elements on the aluminum surface for secure attachment, then the attachment strength is improved, but the fixation elements become accessible and vulnerable to breaking or removal
Solution Approach 1:
The invention relocates the fixation elements from the outer aluminum surface to the inner wooden surface behind the cladding. This positional inversion maintains the attachment strength required for secure hinge fixation while simultaneously eliminating the vulnerability to breakage and unauthorized removal, as the fixation elements are no longer accessible from the outside when the door is closed.
Data Source
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AI summary
A hinge for pivotably connecting a sash of a door or window to a frame comprises a sash part designed to be attached to a sash, and a frame part intended to be attached to a frame. Said sash part and said frame part are interconnected by a pivot elemend which also defines a pivot axis. The pivoting functionality is being accomplished by the pivot element via three bearing tubes, axially aligned along said pivot axis. The first and the second bearing tube are being fixedly attached to the frame part and the third bearing tube is attached to the sash part. The hinge axis itself providing the axial alignment is being realised by an axial pin extending through all three bearing tubes. Thus the third bearing tube can be be arranged and pivoatably held between the first and second bearing tube with axial play. The axial pin exhibits an annular recess with a depth t. The third, bearing tube comprises, arranged at it's circumference, a radially aligned threaded hole intended for accomodating a locking screw. Said locking screw again is chosen in length and diameter to engage with the axial pin's annular recess, when mounted in said radially aligned threaded hole, thus locking the pin's axial position relative to the third bearing tube.