Lock Cylinder Bead Control Mechanism for Copy Protection
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Solution Overview
Problem
Conventional lock-key systems are vulnerable to manipulation and copying due to the requirement for precise alignment of key notches and tumblers, especially in compact designs where space is limited, and lack effective security measures against unauthorized access.
Innovation Solution
A lock-key system featuring a bead-like control member on the key shank with a radially movable axis, interacting with a spring-loaded dumbbell-like feeler pin and blocking pin, which prevents rotation of the cylinder core when not properly aligned, and requires specialized tools for reworking, enhancing security and copy protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lock cylinder with tumblers and key notches is used, then the locking mechanism is simple and easy to manufacture, but it is vulnerable to manipulation and copying
Solution Approach 1:
The locking mechanism is divided into functionally independent segments: the bead-like control member (2) on the key shank operates independently to control the stylus (6), while the blocking pin (7) and locking bar (9) form a separate locking segment. This segmentation allows each component to perform its specific function, enhancing security through layered protection while maintaining manufacturing simplicity for each individual part
Solution Approach 2:
The stylus (6) acts as an intermediary element between the bead-like control member (2) and the blocking pin (7). The bead controls the stylus position, which in turn controls the blocking pin's ability to engage with the locking bar. This intermediary mechanism adds a layer of complexity that prevents direct manipulation while maintaining a relatively simple overall structure
2Reliability
If the key shank is provided with a milling and bead-like control member, then copy protection is enhanced and manipulation is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The bead-like control member (2) is pre-mounted on the key shank during key manufacturing, creating a integrated control mechanism that is difficult to replicate. The milling (13) is also prepared in advance during key production. These preliminary actions embed security features directly into the key itself, making copy protection inherent rather than additive, which simplifies the overall manufacturing process while enhancing security
Solution Approach 2:
The bead-like control member (2) introduces asymmetric geometry to the otherwise symmetric key shank. This asymmetric feature, combined with the specific milling pattern (13), creates a unique configuration that is difficult to copy using conventional key duplication methods. The asymmetry is built into the key manufacturing process rather than requiring complex post-processing
3Volume of moving object
If the cylinder core is made compact to save space, then the lock cylinder size is reduced, but the alignment precision of tumblers and key features becomes more difficult to achieve
Solution Approach 1:
The traditional complex tumbler alignment mechanism is replaced by extracting the alignment function into a separate bead-like control member (2) on the key shank. This bead directly controls the stylus (6) position, eliminating the need for complex interlocking tumblers that require precise alignment. The cylinder core can therefore be made compact while maintaining reliable positioning through the simplified bead-stylus mechanism
Data Source
Figure 1~3a
AI summary
The invention relates to a lock-key system which comprises a lock cylinder, in the lock cylinder housing of which a cylinder core is rotatably mounted, said cylinder core having a key way for insertion of a flat key or reversible key with a longitudinal profiling on the lateral faces of the key shank. The key shank has a milled section extending away from the key back, a bead-type control element being rotatably arranged on a longitudinal axis of the key shank. Said control element cooperates with a tracer pin which in turn influences the movement of a blocking pin.