Removable Key Cassette Assembly for Lock Cylinder Rekeying
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Solution Overview
Problem
Existing lock cylinders lack an efficient method for rekeying without requiring the removal of the entire plug, which complicates the process and increases complexity.
Innovation Solution
A removable cassette system within the lock cylinder that allows for selective rekeying by moving a locking tab out of the way, enabling the cassette to be removed, reconfigured, and reinserted with a new key configuration without disturbing the top pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the entire plug is removed for rekeying, then the lock can be rekeyed, but the process becomes more complex and time-consuming
Solution Approach 1:
The plug is divided into two separable components: a stationary portion remaining in the lock cylinder and a removable cassette containing the key pins. This segmentation allows only the cassette to be removed for rekeying, leaving the stationary portion and top pins in place, thereby simplifying the rekeying process while maintaining full rekeying capability
Solution Approach 2:
The cassette is extracted as a separate removable component from the plug. By taking out only the necessary portion (cassette with bottom pins) rather than the entire plug, the system enables rekeying with minimal disruption to the lock mechanism, reducing complexity and time required
2Adaptability or versatility
If the entire plug is removed for rekeying, then the lock can be rekeyed, but more time is required for the process
Solution Approach 1:
Dividing the plug into stationary and removable cassette portions allows rekeying to be performed on only the necessary component (cassette), significantly reducing the time required compared to removing and rekeying the entire plug
Solution Approach 2:
The cassette is designed with pre-configured pin holes and a removable pin retaining feature, allowing pins to be quickly exchanged without requiring complex disassembly or alignment procedures during the rekeying process
3Reliability
If the locking tab blocks the cassette removal, then the plug remains secured, but the cassette cannot be removed for rekeying
Solution Approach 1:
The locking tab is designed to be movable rather than fixed. It can dynamically switch between a locked position (blocking cassette removal for security) and an unlocked position (allowing cassette removal for rekeying), providing both reliability and ease of operation as needed
Solution Approach 2:
A tool access feature serves as an intermediary mechanism, allowing external manipulation of the locking tab through a tool inserted via the tool access feature. This mediator enables controlled release of the locking tab without requiring direct access to or manipulation of the tab itself, simplifying the removal process
Data Source
AI summary
A lock assembly is provided that includes: a lock cylinder having a bore disposed therein and at least one pocket located adjacent the periphery of the bore; a plug including a cassette slot; a plunger that fits in the plug; a locking tab having a slot disposed therein; the slot of the locking tab receives a portion of the plunger; a cassette having a key slot configured to receive a key; the cassette includes a tool slot configured to receive a tool to selectively engage the plunger to selectively move at least a portion of the locking tab into and out of the pocket; when a portion of the locking tab is located in the pocket the locking tab does not block the cassette from being removed from the plug.