Profiled Cylinder Sleeve-Shaped Ring Locking Mechanism
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Solution Overview
Problem
Existing profile cylinders lack the capability for conditional locking, offering insufficient resistance against unauthorized key actuation and high production costs, while also limiting key rotation functionality.
Innovation Solution
A profile cylinder design featuring a sleeve-shaped ring as a locking element within the cylinder housing, which limits rotational movement based on key coding depth, allowing limited rotation for lock latch opening and full rotation for bolt movement with an authorized key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking device with two sub-elements is used to achieve insurmountable blocking function, then security against tampering is improved, but the capability for conditional locking is lost
Solution Approach 1:
The blocking function is segmented into two independent sub-elements (first sub-element and second sub-element) that can operate separately. The first sub-element provides the insurmountable blocking function, while the second sub-element enables conditional locking capabilities, allowing both functions to coexist without interfering with each other
Solution Approach 2:
The blocking device transitions from a static blocking mechanism to a dynamic system where sub-elements can be selectively activated or deactivated based on the locking condition. This allows the system to adapt between providing absolute blocking and enabling conditional locking operations
2Ease of manufacture
If the blocking device structure is simplified to reduce production costs, then manufacturing ease is improved, but resistance against unauthorized key actuation is reduced
Solution Approach 1:
A blocking element acts as an intermediary component that provides the necessary security function without requiring complex structural modifications. This intermediate element can be independently manufactured and assembled, maintaining security while simplifying the overall production process
Solution Approach 2:
The blocking device is designed to automatically engage and disengage based on the key insertion and rotation, eliminating the need for additional actuation mechanisms or complex control systems. This self-service capability reduces manufacturing complexity while maintaining security functionality
3Reliability
If the pin tumbler depth is increased to prevent unauthorized key actuation, then security is improved, but key rotation functionality is limited
Solution Approach 1:
The pin tumbler system is segmented into multiple depth levels or stages, allowing different keys to engage at different depths. This enables authorized keys with appropriate coding to achieve full rotation while unauthorized keys are blocked at shallower depths, maintaining both security and operational flexibility
Solution Approach 2:
The pin tumbler depth parameter is made variable or multi-level rather than fixed. By implementing adjustable or multi-depth pin tumblers, the system can adapt the engagement depth based on the key being used, allowing full rotation for authorized keys while preventing unauthorized actuation
Data Source
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AI summary
The invention relates to a profile cylinder with a cylinder housing, a rotatable cylinder core having a keyway with a predetermined profile, and key-operated pin tumblers having inner pins in the cylinder core and outer pins in the cylinder housing. Pin springs are also provided in the cylinder housing, which bias the pin tumblers towards the keyway. A sleeve-shaped ring is arranged on an axial section of the cylinder core, extending into at least one of the pin tumblers, and this ring has a locking lug. A recess is located in the partial housing that receives the cylinder core, limiting the rotational movement of the sleeve-shaped ring by causing it to abut against the locking lug.Furthermore, the sleeve-shaped ring contains a bore or through-hole corresponding to the diameter of the respective pin tumbler, whereby, depending on the depth of the coding in the associated key, either the sleeve-shaped ring is coupled to the cylinder core via the pin tumbler or separated, so that, depending on the key and coding, only a limited rotation angle of key and cylinder core is allowed.