Window Fitting Tilt Locking Mechanism Anti-Displacement
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Solution Overview
Problem
Existing window and door fittings do not provide sufficient burglary security when the sash is tilted open, as burglars can exploit the limited opening width by applying forces perpendicular and parallel to the main plane to separate the sash from the fixed frame.
Innovation Solution
A fitting with a switchable displacement lock and retaining device that limits mobility along the tilting axis, featuring a coupling element and securing arm, and a retaining element with a mushroom head pin engaging in a guide slot with undercut longitudinal edges, which prevents unauthorized movement and maintains a resilient connection to the fixed frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sash is allowed to tilt open with a defined opening width, then ventilation function is improved, but burglary security deteriorates because burglars can apply forces to separate the sash from the fixed frame
Solution Approach 1:
The fitting employs dynamic locking elements that automatically switch between locked and unlocked states based on the sash position. The displaceable locking element moves between a locked position (preventing sash removal) and an unlocked position (allowing tilt-open movement for ventilation), enabling the system to adapt its security level according to operational requirements
Solution Approach 2:
The fitting implements preliminary anti-action by providing a locking mechanism that proactively prevents burglary attempts before they can succeed. The locking element is positioned to engage with the fixed frame in advance, creating a mechanical barrier that stops burglars from separating the sash from the frame even when the window is tilted open
2Reliability
If a tilt-opening limiting device is provided to define maximum opening width, then burglary protection is improved, but device complexity increases due to additional coupling elements and guide slots
Solution Approach 1:
The fitting merges the tilt-opening limiting function with the anti-displacement locking function into a single integrated mechanism. The coupling element with its guide slot serves dual purposes: it limits the tilt-opening width by guiding the locking element's movement arc, and simultaneously enables the locking mechanism to engage with the fixed frame, thereby achieving two security functions with one structural element
Solution Approach 2:
The locking element is designed as a multi-functional component that performs multiple tasks: it limits the sash tilt angle by constraining movement within the guide slot, provides burglary protection by engaging with the fixed frame to prevent sash removal, and enables controlled ventilation when unlocked. This universal design reduces the need for separate dedicated components
3Ease of operation
If the locking element is displaceable to switch between locked and unlocked states, then ease of operation is improved, but reliability may worsen due to potential failure in maintaining locked position
Solution Approach 1:
The guide slot is designed with a curved arc shape that geometrically constrains the displaceable locking element. This curved geometry ensures that when the locking element engages with the fixed frame, it is mechanically guided into a stable locked position where the curvature provides natural positioning and resistance to displacement, enhancing reliability without requiring additional locking components
Data Source
Figure 1
Figure 2a~2c
Figure 3
AI summary
A fitting (1) for installation between a sash and a fixed frame of a window, door, or the like defines a tilt axis (16) in a tilt-open position. The fitting (1) includes a tilt opening limiting device, which, in the installed state, is located between a sash mullion extending transversely to the tilt axis (16) and a mullion of the fixed frame opposite it, and which defines a maximum tilt opening width of the sash. Furthermore, the fitting (1) has a switchable anti-displacement device (31), which, in the installed state, is arranged between a tilt-axis-side sash mullion extending parallel to the tilt axis (16) and a tilt-axis-side mullion of the fixed frame opposite it, and which comprises locking elements, one of which is a sash-side locking element (10) associated with the sash, and another is a fixed-frame-side locking element (12) associated with the fixed frame.When the fitting (1) is in the tilt-open position, the anti-displacement device (31) is engaged in a locking state in which the movement of the sash-side locking element (10) relative to the fixed-frame-side locking element (12) and thus the movement of the sash relative to the fixed frame along the tilt axis (16) is at least limited. A window, a door, or the like has a fitting (1) of the aforementioned type between a sash and a fixed frame.