Tamper-Resistant Locking System with Saw-Tooth Shredder
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Solution Overview
Problem
Inmates in detention facilities often use objects like credit cards to unlock cell door locks by inserting them between the door jamb and door, compromising the security of the locking system.
Innovation Solution
A tamper-resistant locking system is designed with a lock housing assembly and pocket housing mounted on the door and wall, featuring a rabbet and stop configuration that prevents objects from being inserted to actuate the lock bolts, and includes a tamper-resistant member with saw-tooth edges to shred any inserted materials, enhancing security by blocking unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional latch or bolt locking mechanism is used on cell doors, then the door can be unlocked by inserting objects like credit cards between the door jamb and door, but this compromises the security of the locking system
Solution Approach 1:
The patent incorporates a saw-tooth member that actively destroys tamper objects (credit cards, etc.) by shredding them when attempted to be inserted between the door and door jamb. This converts the harmful insertion action into a beneficial destruction of the tamper tool, preventing unauthorized unlocking while maintaining the basic latch operation.
Solution Approach 2:
The saw-tooth member is pre-positioned on the door jamb to intercept and prevent the insertion of tamper objects before they can reach the latch mechanism. This preliminary defensive action blocks the tampering path and destroys potential tools before they can compromise the locking system.
2Reliability
If the door and door jamb structure is modified to prevent object insertion, then security is enhanced, but the structural complexity of the door assembly increases
Solution Approach 1:
The door assembly is segmented into distinct functional components: the door, door jamb, latch mechanism, and the added saw-tooth member. This segmentation allows the tamper-resistant feature to be added as a separate element rather than redesigning the entire door structure, thereby enhancing security while minimizing overall structural complexity.
Solution Approach 2:
The saw-tooth member acts as an intermediary element between the door jamb and the latch mechanism. It provides the tamper-resistant function without requiring direct modification of the latch or bolt components, thus enhancing security while keeping the core locking mechanism simple and unchanged.
3Reliability
If a saw-tooth member is added to shred inserted materials, then unauthorized access is prevented, but the manufacturing complexity of the door assembly increases
Solution Approach 1:
The saw-tooth member is designed as a separate, standalone component that can be manufactured independently and then attached to the door jamb. This segmentation allows for specialized manufacturing of just the tamper-resistant feature using appropriate processes, while the rest of the door assembly can be manufactured using conventional methods, thereby limiting the overall impact on manufacturing complexity.
Solution Approach 2:
The saw-tooth member is designed as a relatively simple, potentially disposable component whose primary function is to be destroyed in the process of preventing tampering. This approach accepts that the tamper-resistant element may need replacement but keeps its initial manufacturing simple and cost-effective, focusing resources on the critical security function rather than making the entire door assembly complex.
Data Source
AI summary
The present disclosure is a locking system that has an opening in a door adapted an arranged for receiving a lock bolt and a lock fixed in a wall for actuating a lock bolt adapting and arranged for being received by the opening in the door when the door is closed. The locking system further comprises a blocking strip protruding from a door jamb, the strip coupled to the door jamb and positioned adjacent the lock bolt for blocking access to the lock bolt between the door and the door jamb.