Vehicle Lock Plug Rotation Mechanism for Tamper Resistance
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Solution Overview
Problem
Existing vehicle key lock systems are vulnerable to tampering due to the ease with which the lock plug can be removed by pulling the control key outward, allowing unauthorized access using common tools like paper clips.
Innovation Solution
The lock system features a cylindrically-shaped lock plug with outwardly biased tumblers and a keeper tumbler that requires rotation of the lock plug 45 degrees to remove it from the barrel, making it difficult for common picks to access the lock plug, and includes specific keyways for control, master, and customer keys to manage tumbler retraction and alignment with U-shaped channels for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control key is inserted into the keyway to retract tumblers, then the lock plug can be easily removed by pulling outward, but this makes the lock vulnerable to tampering with common picks
Solution Approach 1:
The lock plug must first be rotated to a specific orientation (preliminary action) before it can be removed. This preliminary rotation step prevents direct pull-out removal, thereby blocking common picking methods that rely on simple outward extraction. The rotation requirement creates an additional security barrier while still allowing authorized removal with the control key.
2Object-affected harmful factors
If the lock plug is made secure against tampering, then security is improved, but the complexity of the lock mechanism increases
Solution Approach 1:
The lock plug incorporates dynamic rotational capability, allowing it to change orientation between locked, unlocked, and removable states. This dynamic element adds security against static picking methods while maintaining operational simplicity through straightforward rotational motion. The dynamic rotation feature provides enhanced security without requiring complex additional mechanisms.
Data Source
AI summary
A lock system is provided having a lock housing and a lock barrel, a keeper shoulder, at least one full positioner shoulder, and a positioner shoulder having a U-shaped channel. A lock plug having a keyway and tumblers is received in the barrel for rotation between locked and unlocked positions. The tumblers include a key tumbler, a positioner tumbler and a keeper tumbler. The lock plug is rotatable between a first rotary position and a second rotary position. A control key is received into the keyway to retract the lock tumbler and partially retract the keeper tumbler. Removal of the lock plug from the lock barrel requires rotation of the lock plug from the first rotary position to the second rotary position and the presence of the control key within the lock plug when in the second rotary position.