Lift-and-Slide Window Fitting Locking Mechanism
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Solution Overview
Problem
Existing locking devices for windows and doors with lift-and-slide sashes face challenges in providing increased burglary protection while allowing for easy operation and assembly, especially when multiple sashes are involved, as they often require additional complex components and are not effective against unauthorized lifting or sliding.
Innovation Solution
A locking device with a swivel bolt and V-ribbed disk mechanism that engages with a pin, providing a non-positive operative connection to prevent unauthorized lifting, combined with a compact design that allows for easy assembly and integration with the actuating linkage, ensuring secure and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional locking mechanisms are added to achieve increased burglary protection with simultaneous forced lowering, then burglary protection is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The locking mechanism and forced lowering function are merged into a single integrated device. The swivel bolt serves dual purposes: it locks the sash in the closed position and simultaneously forces lowering by engaging with the guide rail. This eliminates the need for separate locking mechanisms and forced lowering devices, reducing component count while maintaining high burglary protection.
Solution Approach 2:
The swivel bolt is designed as a multi-functional component that performs multiple tasks: it provides locking engagement with the guide rail, enables forced lowering of the sash, and prevents unauthorized displacement. This universal component approach reduces the overall number of parts needed in the system while achieving multiple security functions simultaneously.
2Reliability
If a locking mechanism with forced lowering is implemented, then burglary protection is improved, but ease of manufacture and assembly deteriorate
Solution Approach 1:
The locking device is segmented into modular components: the swivel bolt, the guide rail with locking surface, and the actuating linkage. Each component can be manufactured independently using standard machining processes, and then assembled together. This segmentation simplifies manufacturing while maintaining the complex locking functionality.
Solution Approach 2:
Instead of having the locking mechanism activate the forced lowering function, the design inverts the sequence: the forced lowering movement itself activates the locking engagement. As the sash is forced downward, the swivel bolt automatically engages with the guide rail, providing locking as a result of the lowering action rather than requiring a separate locking step.
3Ease of operation
If the locking mechanism is made visible, then ease of operation is improved, but security deteriorates due to exposed vulnerability
Solution Approach 1:
The locking mechanism is nested within the existing sash and frame structure. The swivel bolt is housed within the sash profile, and the guide rail locking surface is integrated into the frame. This nesting conceals the locking components within the structural elements, maintaining security by hiding vulnerable points while preserving operational functionality.
Solution Approach 2:
The locking surfaces and engagement points are strategically positioned in localized areas that are not easily accessible to attackers. The guide rail locking surface is located in a recessed area of the frame, and the swivel bolt engagement occurs within the sash profile, providing local security enhancement without requiring visible external components.
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 burglary protection by preventing unauthorized lifting and sliding, while being cost-effective and easy to assemble, maintaining a flush appearance that conceals the locking mechanism for added security.
Implementation Method 1
the flanks of a V-rib entering into a positive operative connection with the flanks of the keyway... the flanks wedge into one another, so that there is a constraint between the components
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a fitting for two sashes (2, 3) which are at least liftable and movable with respect to one another and which are guided on a fixed frame (4) of a window or a door (1) on a running rail (5), wherein an actuating linkage (10) is situated on a first and second vertical sash member (6, 7) within a fitting groove (8, 9) of the first and second sash (2, 3), which actuating linkage has a driving rod (11) which is downwardly displaceable in order to lower the sash (2, 3) by means of an actuating member (12), and transmits the displacement via a corner deflector (13) to at least one coupled carriage (14), and the fitting has a closure device (20) which is fastened by means of a housing (21) to the actuating linkage (10) within the fitting groove (8, 9) and can be coupled via a guide part (22) to the actuating linkage (10), wherein the guide part (22) can be moved by actuating the driving rod (11) of the actuating linkage (10) and transfers a pivoting latch (24), which is controlled by the guide part (22) and rotatably mounted on the housing (21) of the closure device (20), from an opening position in which it is situated in a concealed manner in the housing (21) within the actuating linkage (10), counter to the direction for lowering the sash (2, 3), into a free actuating field (15) of a closure position, wherein a free end (25) of the pivoting latch (24), upon passing into the closure position, is in rearward-engaging engagement with a pin (27) arranged on a latch engagement means (26) fastened to the second sash (3).