Lock Cylinder Intermediate Discs Torsional Play
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Solution Overview
Problem
Conventional lock cylinders are vulnerable to manipulation by picking tools, which can scan and unlock individual tumbler discs, compromising security.
Innovation Solution
The introduction of intermediate discs with controlled torsional play and enlarged peripheral cutouts to prevent unauthorized scanning, ensuring that tumbler discs are not rotated beyond their unlocked positions due to frictional engagement, and allowing the locking pin to move into its release position without hindrance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intermediate discs are rigidly coupled to the cylinder core to prevent rotation, then tumbler discs cannot be scanned by picking tools, but frictional engagement may cause tumbler discs to rotate beyond their unlocked positions
Solution Approach 1:
The intermediate discs are designed with dynamic characteristics - they are non-rotatable relative to the cylinder core, but the tumbler discs can rotate relative to the intermediate discs within controlled limits. This dynamic relationship allows the system to prevent picking while enabling proper unlocking operation.
Solution Approach 2:
The patent controls the torsional play parameter between tumbler discs and intermediate discs to be within specific angular limits (less than the angle between adjacent peripheral recesses). By adjusting this parameter, the system achieves both security against picking and proper operational function.
2Reliability
If tumbler discs are positively coupled to the key with no torsional play, then scanning is prevented, but the key cannot accommodate multiple coding positions
Solution Approach 1:
The coupling between key and tumbler discs is segmented through the intermediate discs. The key is positively coupled to each tumbler disc through its respective notch, but the intermediate discs provide segmentation that allows controlled torsional play, enabling multiple code positions while maintaining security.
Solution Approach 2:
The intermediate discs act as intermediaries between the key and the tumbler discs. They transmit the key's rotational movement to the tumbler discs while providing controlled torsional play, thus enabling both security and adaptability for multiple coding positions.
3Reliability
If intermediate discs have zero torsional play, then picking security is maximized, but the locking pin cannot move into the release position
Solution Approach 1:
The torsional play parameter of the intermediate discs is precisely controlled to be non-zero but within specific limits. This parameter adjustment allows the locking pin to move into the release position during normal operation while preventing picking tools from scanning the tumbler discs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances security by making it difficult for picking tools to scan and manipulate the lock cylinder, while ensuring proper operation with the key, preventing unintended movement of tumbler discs beyond their unlocked positions.
Implementation Method 1
an adjacent tumbler, which may have already been brought into its unlocked position by means of the picking tool, is twisted again due to frictional engagement
Data Source
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AI summary
The lock cylinder has locking pin for blocking cylinder core against rotational movement in radially outer blocking position and for releasing cylinder core for rotational movement in radially inner release position. The pin is displaced into release position when all tumbler discs (16) are in their unlatch position. Several intermediate plates (136) are arranged along cylinder axis in core. A respective intermediate plate is arranged between two mutually adjacent tumbler discs, where intermediate plates have predefined backlash (S) relative to core.