Modular Lock Plug Sidebar Radial Movement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional locks with locking sidebars suffer from limitations in preventing rotation of the plug with respect to the shell, necessitating further improvements in lock cylinder technology.
Innovation Solution
A plug assembly featuring a sidebar movably mounted on the plug, with a plurality of rack pins that include a true gate and false gates, allowing the sidebar to move radially inward when a proper key is inserted, enabling secure locking and unlocking mechanisms, and preventing rotation of the plug when in the locked state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional locks with locking sidebars are used, then the locking function is provided, but the security against unauthorized rotation is insufficient
Solution Approach 1:
The lock mechanism is segmented into distinct functional components: rack pins with gate structures, sidebars, and a plug. Each component has a specific role in the locking/unlocking sequence, allowing for improved security through modular design while maintaining manufacturability
Solution Approach 2:
The sidebars are designed to be movable rather than fixed, transitioning between extended (locked) and retracted (unlocked) positions. The rack pins similarly move between engaged and disengaged states, creating a dynamic system that responds to key insertion and provides progressive security
2Reliability
If rack pins with true gate and false gates are implemented, then the key verification security is improved, but the manufacturing complexity increases
Solution Approach 1:
The rack pins feature localized gate structures at specific positions along their length. The true gate and false gates are positioned at different locations, creating local variations in geometry that provide security differentiation without requiring complete redesign of the entire pin structure
Solution Approach 2:
Multiple functional features (key following leg, sidebar-engaging leg, true gate, false gates) are merged into a single integrated rack pin component. This consolidation reduces the total number of parts while maintaining the complex security functionality through clever geometric design
3Reliability
If the sidebar is biased to an outer position extending beyond the plug surface, then the locked state is more secure, but the ease of operation for unlocking is reduced
Solution Approach 1:
The sidebar is preliminarily biased to the extended locked position, requiring a deliberate unlocking action. The spring bias ensures the sidebar starts in the secure extended position and will only retract when the plug is actively rotated to align the gates, preventing accidental unlocking
Solution Approach 2:
The gate structures on the rack pins act as intermediaries between the key insertion action and the sidebar movement. The alignment of true gates with key features mediates the transition from locked to unlocked state, providing a clear mechanical indication of proper key verification
Data Source
AI summary
A plug assembly including a plug, a sidebar movably mounted on the plug, and a plurality of rack pins seated in the plug. The sidebar is biased to an outer position in which the sidebar extends beyond an outer surface of the plug. Each rack pin includes a key-following leg and a sidebar-engaging leg. The sidebar-engaging leg includes at least one true gate. When a true gate of each rack pin is aligned with the sidebar, the sidebar is free to move radially inward to an inner position.