Deviated Keyway Locking System with Rotating Idler Block
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Solution Overview
Problem
Current high security locking systems are susceptible to tampering and unauthorized access due to accessible tumbler pins and keys, which can be picked using straight tools, and may be compromised by drilling out the cylinder.
Innovation Solution
A high security locking system featuring a deviated key and rotating idler block with translating shields that create a deviated picking path, restricting access to tumbler pins by changing the keyway path direction and using hardened components to prevent drilling, with the idler block and lock cylinder having offset axes for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional linear keyways and accessible tumbler pins are used, then the locking system is easy to operate and pick, but security is compromised due to susceptibility to tampering and drilling
Solution Approach 1:
The patent introduces a deviated keyway that changes direction within the lock cylinder, creating a non-linear path from the keyhole to the tumbler pins. This dimensional change in the keyway geometry prevents straight-line picking tools from reaching the pins and blocks direct drilling access, thereby enhancing security while maintaining operational functionality with the corresponding deviated key
Solution Approach 2:
The patent employs hardened intermediate components (such as hardened steel inserts or carbide barriers) positioned within the lock cylinder along the deviated keyway path. These intermediary elements act as protective mediators that prevent drilling tools from reaching the tumbler pins and cylinder core, significantly improving resistance to tampering and drilling attacks
2Reliability
If hardened components are used to prevent drilling, then drilling resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The locking system is divided into separate modular components: the lock body, the lock cylinder, and interchangeable hardened insert components. This segmentation allows the hardened drilling-resistant elements to be manufactured separately using specialized processes and then assembled into the cylinder, reducing overall manufacturing complexity while maintaining high drilling resistance
Solution Approach 2:
The patent utilizes composite construction by combining different materials with complementary properties - the lock cylinder is made of durable metal while hardened steel inserts or carbide barriers are embedded within it. This composite approach provides superior drilling resistance at the critical areas without requiring the entire lock assembly to be made from difficult-to-manufacture hardened material, thus balancing security with manufacturability
3Reliability
If a deviated keyway path is created, then access to tumbler pins is restricted, but the key and lock mechanism become more complex
Solution Approach 1:
The deviated keyway introduces geometric complexity through angular changes and non-linear paths within the cylinder bore. This dimensional complexity effectively blocks conventional picking tools while the corresponding deviated key is designed to match this geometry, creating a secure interface that maintains functional simplicity for authorized users
Solution Approach 2:
The keyway is designed with asymmetric geometry featuring specific angles, offsets, and contours that do not mirror each other. This asymmetric deviated path ensures that only the precisely matched deviated key can engage the tumbler pins, preventing picking attempts with symmetric or standard keys while maintaining a relatively simple overall lock structure
Data Source
AI summary
A locking system has a lock housing having first pin slots, a lock cylinder having second pin slots and being supported within the lock housing such that rotation of the lock cylinder is dependent upon a position of tumbler pins within the pin slots, and an idler block defining a keyway to receive a deviated key in which the idler block is rotatable relative to the lock cylinder between an entry position and a pin position aligning the key with the pin slots. One or more translating shields in the idler block are movable from an open position in which the keyway is unobstructed by the shield to allow for insertion or removal of the deviated key and a closed position in which the translating shield protrudes at least partway into a path of the keyway without interfering with rotation of the deviated key with the idler block.