Window Fitting Stop Mechanism for Anti-Levering Security
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Solution Overview
Problem
Existing window and door fittings face challenges in providing enhanced security against break-ins with complex designs that increase assembly effort and do not effectively absorb forces perpendicular to the sash or frame plane.
Innovation Solution
A stop mechanism with a spring-loaded locking bar and releasable latching device is integrated, which engages with the locking element and bolt, allowing the bolt to absorb forces and secure the locking point, even during large relative displacements, using a structurally simple configuration with few components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stop is provided opposite the locking element with a spring-loaded locking bar and releasable latching device, then security against break-ins is enhanced and forces perpendicular to the sash plane are absorbed, but the device complexity increases
Solution Approach 1:
The locking bar (9) is nested within the stop (1) structure, and the latching device is integrated into the base part (8). The locking bar can engage with locking slots (5, 6) on both sides of the locking engagement, creating a nested configuration that maximizes security within a compact form factor without requiring separate external components.
Solution Approach 2:
The stop (1) combines multiple functions into a single integrated component: it provides the locking bar (9) for engagement with locking slots, incorporates a spring-loaded latching device with cover part (7) and base part (8), and positions itself to absorb forces perpendicular to the sash plane. This merging of functions reduces the need for separate security mechanisms.
2Reliability
If the locking element is positioned at a small distance from the transverse edge to prevent levering out, then security is improved, but the available rebate clearance is narrowed complicating relative displacement
Solution Approach 1:
The stop (1) is positioned in the rebate area, utilizing the depth dimension of the rebate space rather than consuming lateral clearance. The locking bar (9) extends horizontally to engage locking slots while the stop body is recessed into the rebate, effectively adding security in the lateral dimension without compromising the vertical clearance needed for sash operation.
3Reliability
If a complex locking mechanism with multiple components is used to absorb forces perpendicular to the sash plane, then security is improved, but the assembly effort and number of components increases
Solution Approach 1:
The stop (1) is divided into two main segments: the base part (8) that is stationary and mounted on the sash, and the cover part (7) that contains the movable locking bar (9) and spring-loaded latching device. This segmentation allows for simplified manufacturing and assembly, where the base part can be pre-installed and the cover part attached with the latching mechanism.
Solution Approach 2:
The stop (1) is designed as a universal component that can be applied to various window and door configurations. The locking bar (9) can engage with locking slots in different positions, and the overall design works with standard espagnolette fitting arrangements, reducing the need for custom-designed components for different applications.
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 solution enhances security by preventing the locking element from being levered out and absorbs forces perpendicular to the sash or frame plane, reducing the risk of break-ins while maintaining ease of assembly and operation.
Implementation Method 1
a spring-loaded locking bar and releasable latching device for the locking bar that is spring-loaded in the direction of the locking engagement
Data Source
Figure 1~3
Figure 4~5
Figure 6~7b
AI summary
The invention relates to a fitting for a window or a door, wherein a locking element (2) is provided for engaging with a lock-engaging element (3) in a displacement direction running along a rebate. When in the locked position, said locking element engages in a laterally open locking slot (5) in the lock-engaging element (3), the locking slot running along the rebate. A stationary stop (1) is associated with and a short distance from the locking element (2) on the transverse edge of the lock-engaging element (3) opposite the locking slot (5). The aim of the invention is to obtain an improved design which is easy to mount and does not have an adverse effect on the normal operation of the fitting, but still improves security during an attempted break-in. To achieve this aim, the stop (1) has a detachable detent mechanism for a lock (9) spring-loaded in the direction of the lock-engaging element (3), and the detent mechanism is triggered when the lock-engaging element (3) contacts the stop (1).