Safety Lock Anti-Manipulation Plate Mechanism
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Solution Overview
Problem
Conventional safety locks are vulnerable to simplified illicit opening techniques, such as self-learning picklocks, which can bypass the lock's security without leaving signs of tampering, making them unreliable under normal use conditions.
Innovation Solution
The safety lock incorporates a bolt member with recessed hook-shaped portions and an anti-manipulation plate with inclined profiles and displacement wings, which interact with the bolt member and safety plates to prevent illicit opening by locking the manipulation instrument in a position where the key profile cannot be detected, and a shield that obstructs the key passage port when manipulated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional safety locks are used, then the lock structure is simple and easy to manufacture, but the lock is vulnerable to simplified illicit opening techniques such as self-learning picklocks
Solution Approach 1:
The lock mechanism is divided into separate functional components: a bolt member with hook-shaped portions, an anti-manipulation plate with displacement wings, and a shield. Each component performs a specific function in preventing illicit opening, allowing the complex security mechanism to be constructed from modular, manufacturable parts
Solution Approach 2:
The anti-manipulation plate acts as an intermediary element between the bolt member and the manipulation instrument. It includes displacement wings that interact with the bolt's hook-shaped portions to create a mechanical barrier, preventing the manipulation instrument from directly engaging with the key profile while still allowing legitimate key operation
2Reliability
If traditional safety plates with recesses are used, then the detection of lever position becomes difficult, but the lock remains vulnerable to oscillatory manipulation techniques
Solution Approach 1:
The anti-manipulation plate is designed to be dynamically responsive to manipulation attempts. When oscillatory forces are applied by a manipulation instrument, the displacement wings move independently, preventing the instrument from detecting consistent key profile information while maintaining stable operation with the legitimate key
Solution Approach 2:
Instead of making the key profile detection difficult through complex plate recesses, the invention inverts the approach by using the anti-manipulation plate's displacement wings to actively prevent manipulation instrument engagement. The legitimate key operates through a different mechanism (direct engagement with safety plates), while illicit instruments are blocked by the moving wings
3Reliability
If the manipulation instrument can detect the key profile, then the lock can be opened, but illicit opening without leaving signs becomes possible
Solution Approach 1:
The shield and anti-manipulation plate are positioned to preemptively block the manipulation instrument before it can detect the key profile. The displacement wings create a mechanical barrier that prevents the instrument from reaching the safety plates, and the shield obstructs the key passage port, stopping illicit attempts before they can leave visible signs
Data Source
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AI summary
A safety lock (1), comprises a frame and a bolt member (12) movably mounted on the frame and shiftable by rotation of the key in the lock between a first position corresponding to an open condition of the lock and a second position corresponding to a closed condition of the lock. At least one safety plate (4) is movably mounted on the frame and is translatable by rotation of the key in the lock to a position enabling movement of the bolt member (12). Hooking means operates between the bolt member (12) and the at least one safety plate (4), following a thrust illicitly produced on the bolt member (12). Also provided is means for enabling rotation of the safety plate (4) to a maximum lifting-up position of the safety plate itself. The hooking means comprises a hook-shaped portion (16a, 16b) formed in a safety pin (13) of the bolt member (12) adapted to cross a window (8) of the safety plate ( 4 ).