Active Hardplate Drill Attack Lockout Mechanism
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Solution Overview
Problem
Existing safe locking systems are vulnerable to unauthorized access due to the inability to effectively resist drill attacks, as conventional locks and latching mechanisms can be compromised with relatively low force, allowing quick penetration and opening.
Innovation Solution
The integration of a moveable and active hardplate made of hardened steel with sintered tungsten carbide granules, which displaces upon a predetermined force, triggering an independent lockout system that prevents the unlatching of the door, thereby requiring significantly more force to penetrate and prolonging the time needed to break into the safe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional locks and latching mechanisms are used, then the safe can be easily opened with relatively low force, but the security against drill attacks is insufficient
Solution Approach 1:
The patent employs a composite structure consisting of a hardplate made from hardened steel with sintered tungsten carbide granules embedded within a softer matrix material. This composite construction combines the high hardness and drill-resistance of tungsten carbide with the ductility and energy-absorbing properties of the softer matrix, creating a material that requires significantly more force to penetrate while maintaining reliability against drill attacks.
Solution Approach 2:
The hardplate's mechanical properties are optimized by controlling the hardness, density, and distribution of the sintered tungsten carbide granules within the matrix material. By adjusting these parameters, the plate achieves optimal resistance to drill penetration while maintaining the ability to deform and absorb impact forces, thereby improving security without requiring excessive force for legitimate access.
2Reliability
If a moveable hardplate is used to trigger lockout system, then the security is improved by preventing unlatching, but the device complexity increases
Solution Approach 1:
The hardplate is designed to be moveable rather than fixed, capable of displacement in response to applied force. This dynamic characteristic allows the plate to trigger the lockout system only when subjected to abnormal forces (such as drill attacks), while remaining passive during normal operation. The moveable nature simplifies the triggering mechanism compared to complex sensor systems, as the plate's physical displacement directly activates the lockout function.
Solution Approach 2:
The hardplate itself serves dual functions: it provides physical barrier protection and simultaneously acts as the triggering mechanism for the lockout system. When the plate is displaced by excessive force, it directly engages or triggers the lockout mechanism without requiring separate sensors or detection systems. This self-service approach reduces device complexity by eliminating the need for additional detection components.
3Strength
If hardened steel with sintered tungsten carbide granules is used, then the resistance to drilling is significantly increased, but the manufacturing complexity increases
Solution Approach 1:
The hardplate utilizes a porous or composite matrix material into which sintered tungsten carbide granules are embedded. This structure allows the softer matrix to be more easily manufactured and formed, while the sintered granules provide the enhanced drill resistance. The matrix material can be cast or formed using conventional techniques, and the tungsten carbide granules are incorporated during the manufacturing process, balancing strength requirements with manufacturing ease.
Solution Approach 2:
The composite construction with sintered tungsten carbide granules in a softer matrix enables a division of labor in manufacturing: the matrix material can be formed using standard metalworking or casting techniques, while the tungsten carbide granules are added in a sintering process. This approach is more feasible than attempting to create a fully homogeneous hardened steel plate, as it allows each material component to be processed using methods appropriate to its properties.
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 active hardplate significantly increases the security of safes by making it extremely difficult to drill through, requiring substantial force to penetrate, thereby substantially prolonging the time required for unauthorized access and providing additional protection against drill attacks.
Implementation Method 1
a moveable and active hardplate made of hardened steel with sintered tungsten carbide granules, which displaces upon a predetermined force
Data Source
AI summary
A safe or other secure containment having a body, a door for entry into the body, a moveable latch system effective for latching and unlatching the door to the body, a lock attached to the door for locking the safe is made more secure by an active hardplate and an independent lockout means effective for preventing the unlatching of the safe door upon the displacement of the active hardplate caused by an unauthorized and unlawful attempted entry into the safe. Existing safes also can be modified.