Modular Interchangeable Lock Plug Assembly
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Solution Overview
Problem
Current lock cylinders face limitations in design flexibility due to the size of their towers, which restricts housing design options, and lack ease of installation and replacement, particularly in interchangeable core and key-in-lever formats.
Innovation Solution
A modular plug assembly with a tumbler system and retention mechanism that allows for selective rotation and removal within a housing, enabling both actuation and replacement without requiring handle removal, using a change key for rotation and a control key for removal, and optionally integrating the housing within the handle shank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If interchangeable core lock cylinders are used to enable selective removal for rekeying, then ease of replacement is improved, but the tower size increases which limits housing design options
Solution Approach 1:
The lock cylinder is divided into two separable components: a reusable housing (shell) and an interchangeable plug assembly. The plug contains the tumbler system and keyway, while the housing provides the tower and mounting structure. This segmentation allows the plug to be removed and replaced independently without removing the handle or disturbing the housing, resolving the contradiction by enabling easy replacement while maintaining compact tower dimensions.
Solution Approach 2:
The plug assembly is nested within the housing, with the plug rotatably mounted inside the shell. The plug contains the tumbler system within its body, and the housing contains the plug assembly. This nested configuration allows the smaller plug to be housed within the compact tower structure, enabling easy plug replacement while maintaining a compact overall footprint that does not limit housing design options.
2Adaptability or versatility
If key-in-lever format cylinders are used to reduce tower profile for greater handle versatility, then adaptability is improved, but interchangeability functionality is lost requiring handle removal for replacement
Solution Approach 1:
The system is segmented into a permanent housing (with compact tower for handle compatibility) and a removable plug assembly. The plug contains all interchangeable components (tumbler system, keyway). This allows the compact housing to maintain versatility with various handle designs while the separate plug provides interchangeability functionality, resolving the contradiction by combining the advantages of both formats.
3Ease of operation
If the plug assembly is made rotatable for key operation, then operational functionality is improved, but security against unauthorized removal is worsened
Solution Approach 1:
The plug assembly is designed with dynamic characteristics: it can rotate freely when the correct key is inserted (enabling operation), but remains constrained and secure when no key is present or an incorrect key is used. The retention mechanism provides conditional retention - secure in normal conditions, releaseable only with proper authentication. This dynamic behavior resolves the contradiction by allowing rotation for operation while maintaining security during non-operational states.
Data Source
AI summary
An exemplary lock apparatus includes a housing and a plug assembly rotatably mounted in the housing. The plug assembly includes a tumbler assembly operable to selectively prevent rotation of the plug assembly relative to the housing and a retention mechanism operable to selectively prevent removal of the plug assembly from the housing. A system including the lock apparatus may include a change key configured to actuate the tumbler assembly without actuating the retention mechanism and/or a control key configured to actuate both the tumbler assembly and the retention mechanism.