Shutter Fitting with Automatic Overload Unlocking Mechanism
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Solution Overview
Problem
Existing shutter holder fittings integrated into the shutter hinge are prone to breaking under strong winds and are bulky, posing a risk of accidents and aesthetic concerns.
Innovation Solution
A fitting arrangement with beveled or curved latching elements that automatically unlock under excessive loads, providing overload protection, and a space-saving design using pin sockets, disk-shaped toothed components, and a compression spring for reliable locking and easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid locking mechanism is used to securely hold the shutter, then the shutter holding reliability is improved, but the mechanism becomes prone to breaking under strong winds and poses accident risks
Solution Approach 1:
The locking mechanism transitions from a static rigid structure to a dynamic system with movable latching elements that can disengage under excessive load. The latching elements are designed to move between engaged and disengaged positions, allowing the mechanism to adapt its rigidity based on applied forces - rigid during normal operation, flexible under storm conditions.
Solution Approach 2:
The harmful effect of strong winds that could break rigid locking mechanisms is converted into a beneficial automatic unlocking function. The excessive force from wind loads causes the latching elements to disengage, preventing damage to the fitting and eliminating accident risks while maintaining security during normal conditions.
2Reliability
If a traditional locking mechanism is used, then the shutter can be securely held, but the mechanism becomes large and conspicuous
Solution Approach 1:
The latching elements are nested within the hinge structure itself, with the shutter-side latching element integrated into the shutter-side fitting part and the wall-side latching element integrated into the wall-side fitting part. This nesting eliminates the need for separate external locking components, significantly reducing the overall installation space and achieving a compact, aesthetically pleasing design.
3Reliability
If the latching elements have a chamfered or rounded shape for automatic unlocking, then overload protection is provided, but the locking mechanism becomes more complex
Solution Approach 1:
The complexity is localized only to the critical latching elements where chamfered or rounded shapes are applied to enable automatic unlocking. The rest of the hinge structure maintains simple, conventional geometry. This selective application of complex geometry only where needed minimizes overall device complexity while providing the required overload protection function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The fitting arrangement ensures secure shutter holding during normal use while preventing damage from strong winds by automatically unlocking and maintaining a compact, aesthetically pleasing appearance.
Implementation Method 1
at least one spring element is provided for pre-tensioning the loading-side locking element or the wall-side locking element into the engagement position
Data Source
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AI summary
A hardware assembly for a window or door shutter comprises a shutter-side hardware component and a wall-side hardware component, which are rotatably connected to each other about a shutter hinge axis and can be locked in at least one rotational position by means of a locking mechanism. The locking mechanism comprises a shutter-side locking element that is not rotatable relative to the shutter-side hardware component, and a wall-side locking element that interacts with the shutter-side locking element and is not rotatable relative to the wall-side hardware component. The locking elements are displaceable relative to each other in a direction parallel to the shutter hinge axis between an engaged position and a disengaged position. A spring element is provided to pre-tension the locking elements into the engaged position.The latching element on the drawer side and/or the latching element on the wall side has a slope or rounding which, when the fitting parts are rotated relative to each other, causes the latching element on the drawer side or the latching element on the wall side to be moved from the engaged position to the non-engaged position, at least in one direction of rotation, by overcoming the preload force of the spring element.