Lockable Fitting With Nested Cylinder And Asymmetric Mounting
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Solution Overview
Problem
Existing lockable fittings for windows and doors lack adequate security and ease of use, as they can be easily manipulated or disassembled by unauthorized persons, and the process of replacing lock cylinders is cumbersome and not burglar-proof.
Innovation Solution
A lockable fitting with a stop plate fastened to a flat support via screwing a central body, featuring a guide bushing and angled ring element arms that limit axial movement of the lock cylinder, providing a secure and easy-to-assemble design that meets burglary resistance standards and prevents unauthorized operation or disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple lockable fitting with a handle and locking mechanism is used, then ease of manufacture and low cost are achieved, but burglary resistance and security against unauthorized operation are insufficient
Solution Approach 1:
The lock cylinder is nested within the fitting housing, with the locking bolt housed inside the lock cylinder. This nested structure allows the locking mechanism to be integrated within the fitting, providing security while maintaining a compact and manufacturable design. The lock cylinder itself contains the locking bolt, creating multiple levels of nesting that enhance security without significantly increasing complexity.
Solution Approach 2:
The locking bolt is spring-loaded and automatically engages with the window frame when the handle is in the closed position, providing preliminary locking action before any manipulation attempt. This preliminary action ensures that the fitting is locked by default, and additional security measures (such as the lock cylinder) are only engaged when intentional unlocking is required.
2Reliability
If a key-operated lock cylinder is inserted into the fitting, then burglary resistance is improved, but the complexity of assembly and replacement increases
Solution Approach 1:
The fitting is divided into distinct modular components: the fitting housing, the lock cylinder, and the locking mechanism. This segmentation allows the lock cylinder to be independently inserted, removed, and replaced without affecting the entire fitting assembly. The lock cylinder is designed as a separate module that interfaces with the fitting housing through standardized mounting features, simplifying assembly and maintenance.
3Ease of repair
If the lock cylinder can be freely removed for replacement, then ease of maintenance is achieved, but security against unauthorized removal and manipulation is compromised
Solution Approach 1:
The lock cylinder mounting features asymmetric design elements that allow removal only in specific orientations and conditions. The locking bolt and its interaction with the window frame create an asymmetric engagement that prevents unauthorized removal while allowing controlled replacement by authorized personnel with the proper key or tool.
4Ease of operation
If the handle is made movable and rotatable for operation, then ease of use is improved, but vulnerability to forced removal and manipulation increases
Solution Approach 1:
The locking bolt provides preliminary anti-action by automatically engaging with the window frame when the handle is closed, creating resistance against any forced manipulation before unauthorized persons can attempt to remove or manipulate the handle. This preliminary locking action counteracts potential harmful forces applied to the handle.
Solution Approach 2:
The handle and locking mechanism are merged into an integrated assembly where the handle's rotation directly actuates the locking bolt. This merging ensures that the handle cannot be effectively manipulated without simultaneously engaging or disengaging the locking mechanism, providing coordinated security and operation.
Data Source
Figure 1
Figure 2
Figure 3.1~3.3
AI summary
Mounting (10) comprises a mounting plate (12) fixed to a flat support by screwing a central body (20) connected to the support plate. The central body has a guiding bushing (24) bearing a locking body (15) and having a radially connecting traverse bushing (22) into which a closing cylinder (30) is inserted. Preferred Features: The traverse bushing guides the closing cylinder which has parallel flat parts (36) on which lie stops (43) located in the central body. The locking body has two pairs of radial grooves (35) lying diametrically opposite each other in its lower region on the outer periphery.