Locking Cylinder Core Pin Shim Fixation Sequence
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Solution Overview
Problem
Existing lock cylinders are vulnerable to manipulation and picking attempts, as the alignment of blocking and fixing recesses allows unauthorized access by aligning locking pin positions with individual shims, enabling the detection of coding and simulation of key incisions.
Innovation Solution
The lock cylinder design introduces a chronological sequence for the engagement of the core pin and locking pin, ensuring that shims are fixed against individual rotation after the final sorting position, preventing the locking pin from being pushed radially inward and making it impossible to read the codes of individual shims, thereby enhancing protection against picking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the locking pin can be pushed radially inward while individual shims are rotatable, then the lock can be unlocked, but the lock becomes vulnerable to picking attempts and manipulation
Solution Approach 1:
The patent applies preliminary action by requiring the core pin to engage the fixing recesses and fix the shims in place before the locking pin is pushed radially inward to unlock. This preliminary fixing action eliminates the vulnerability to picking attempts, as the shims can no longer be individually manipulated after being fixed, while still allowing legitimate unlocking through the key-driven sequence.
2Productivity
If shims can rotate individually relative to the disc housing, then sorting can be achieved, but code detection and key simulation becomes possible
Solution Approach 1:
The patent implements preliminary action by having the core pin engage the fixing recesses and fix the shims to the disc housing after sorting is achieved. This ensures that the sorting function is completed while the shims are still rotatable, but then immediately secures the coded positions by preventing further individual rotation, thus protecting the code information from detection.
Solution Approach 2:
The core pin acts as an intermediary element between the key-operated sorting mechanism and the final locked state. It mediates the transition by first allowing the shims to be sorted to their coded positions, then engaging the fixing recesses to secure those positions, and finally enabling the locking pin to move radially inward. This intermediary action protects the code information while maintaining the sorting function.
3Object-affected harmful factors
If a chronological sequence is implemented for pin engagement, then protection against manipulation increases, but the mechanism complexity increases
Solution Approach 1:
The patent merges the sorting and securing functions into a single integrated mechanism. The core pin serves dual purposes: it controls the chronological sequence of events (first allowing sorting, then fixing shims, then enabling unlocking) and physically secures the shims by engaging the fixing recesses. This merging reduces complexity compared to having separate mechanisms for sorting control and shim fixation.
Solution Approach 2:
The core pin is designed as a multi-functional element that performs multiple roles: it guides the chronological sequence of operations, engages the fixing recesses to fix the shims, and ultimately allows the locking pin to move radially inward for unlocking. This multi-functionality reduces the need for additional separate components, thereby managing complexity while achieving high manipulation resistance.
Data Source
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AI summary
A locking cylinder comprising a cylinder housing, a disc housing rotatably mounted in the cylinder housing about a cylinder axis, and several rotatably mounted adjusting discs arranged in the disc housing along the cylinder axis, wherein each adjusting disc has a receiving opening for a key, a locking recess on its outer circumference for at least partial reception of a locking pin aligned parallel to the cylinder axis, and, offset from the locking recess, a fixing recess provided on its outer circumference for at least partial reception of a core pin aligned parallel to the cylinder axis, and wherein the adjusting discs can be rotated from a starting position with the key removed into a sorting position by turning the inserted key in the unlocking direction, in which the locking recesses of all adjusting discs are aligned with each other when viewed in the direction of the cylinder axis, is characterized in thatthat in the sorting position the fixing recesses of all adjusting discs are aligned with each other in the direction of the cylinder axis, the locking cylinder being adapted so that when the adjusting discs are further rotated from the sorting position in the unlocking direction, the core pin first enters the fixing recesses and only then the locking pin enters the locking recesses.