Hierarchical Cylinder Lock Sidebar Slider Mechanism
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Solution Overview
Problem
Current hierarchical lock systems require multiple key types and increased manufacturing complexity to achieve different security levels, with standard security cylinders lacking enhancements to resist contemporary lock picking techniques and being costly to produce.
Innovation Solution
A lock system featuring a cylindrical plug with tumbler pin assemblies, a movable sidebar, and a slider mechanism that allows for hierarchical keying, where keys can elevate and rotate tumblers and position the slider to control the sidebar's movement, enabling cost-effective production and enhanced security without requiring precise rotational positioning of pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard security cylinders are used without enhancements, then manufacturing cost is reduced, but security against lock picking is insufficient
Solution Approach 1:
The lock cylinder is divided into functional segments: a sidebar mechanism for blocking rotation, a slider mechanism for controlling sidebar movement, and tumbler pin assemblies for key operation. This segmentation allows the standard security cylinder to incorporate enhanced security features (sidebar and slider) that resist lock picking while maintaining a relatively simple and cost-effective manufacturing process compared to fully high-security cylinders.
2Adaptability or versatility
If hierarchical keying systems are implemented with multiple key types, then security levels are differentiated, but key management complexity increases
Solution Approach 1:
The high-security master key is designed with universal functionality to operate both high-security cylinders (with rotating pins) and standard-security cylinders (with sidebar and slider mechanisms). This multi-functionality allows a single key to provide access across different security levels, simplifying key management while maintaining differentiated security through the cylinder mechanisms themselves rather than requiring entirely separate key systems.
3Reliability
If high security cylinders are installed on all doors, then security protection is maximized, but cost increases significantly
Solution Approach 1:
Different security levels are applied to different locations (doors) based on their specific security requirements. High-security cylinders with rotating pin mechanisms are installed on critical doors requiring maximum protection, while standard-security cylinders with sidebar and slider mechanisms are installed on less critical doors. This local differentiation of security quality optimizes overall security protection while significantly reducing total installation and maintenance costs compared to universal high-security deployment.
Data Source
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AI summary
A hierarchical lock system includes a first cylinder lock having a cylindrical plug, rotatable, reciprocating tumbler pins, a slider disposed within the plug and a side bar that cooperates with the cylinder plug, the slider, and the tumbler pins to control rotation of the lock. A second cylindrical lock includes a cylindrical plug, reciprocating tumbler pins, a slider, and a side bar that cooperates with the cylindrical plug and the slider. A first key is configured to open both the first and second locks by elevating and rotating the tumbler pins, and moving the slider to an unlocked position with respect to the side bar. A second key is able to open only the second cylindrical locks by elevating but not rotating the tumbler pins and by moving the slider to an unlocked position with respect to the side bar.