Cylinder Lock Anti-Breaking Composite Cam Design
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Solution Overview
Problem
Existing cylinder locks are vulnerable to burglary attacks, particularly due to the accessibility of cam movement blocking elements after forced removal of the outer core, allowing for manual manipulation and drilling, which can lead to cam rotation and lock opening.
Innovation Solution
The cylinder lock design features a composite cam with remotely positioned blocking elements, a permanent connection between the outer core and second switching element, and hardened steel components to prevent manipulation and drilling, ensuring the cam movement is blocked and the lock remains secure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocking elements are positioned to block cam movement, then cam manipulation is prevented, but blocking elements become accessible to manual manipulation and drilling after outer core removal
Solution Approach 1:
The blocking element is moved from the cam periphery to the cam center, and further protected by the inner core structure. This spatial repositioning in multiple dimensions (from external to internal, from accessible to protected) removes the blocking element from the attack path while maintaining its blocking function.
Solution Approach 2:
The blocking element is nested within the inner core structure, specifically positioned in a radial bore that is protected by the inner core. The inner core acts as a protective layer surrounding the blocking element, similar to nested dolls, making the blocking element inaccessible from the outside even after outer core removal.
2Ease of operation
If housing central section is made thin to accommodate cam rotation, then cam mechanism is enabled, but housing becomes vulnerable to breaking
Solution Approach 1:
The cam mechanism is changed from a solid ring to a composite structure with a cam ring and a transmitting plate. This composite construction allows the cam to fit within the thin housing central section while maintaining structural integrity and resistance to breaking attacks.
Solution Approach 2:
The cam is segmented into a cam ring and a transmitting plate, allowing the mechanism to be distributed across the thin housing section. This segmentation enables the cam rotation function while reducing the need for a thick housing central section.
3Adaptability or versatility
If switching elements are made movable to provide selective connection, then core-cam connection is enabled, but switching elements can be inactivated after forced core removal
Solution Approach 1:
A compression spring is pre-installed behind the first switching element to automatically push it into the engaged position. This preliminary anti-action counteracts any attempt to inactivate the switching element by forcing it back into the correct position, ensuring reliable operation even after forced core removal.
Solution Approach 2:
The compression spring provides self-service by automatically returning the first switching element to its engaged position after any displacement. This eliminates the need for manual intervention or complex reset mechanisms, ensuring the switching element remains functional without additional control systems.
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
The enhanced anti-breaking function effectively limits cam movement towards the inner core, prevents inactivation of blocking elements, and provides additional strength to the inner housing part, making it difficult to break or drill through during a burglary attempt.
Implementation Method 1
behind the first switching element, in the inner core, there is mounted a compression spring
Data Source
Figure 1
Figure 2
AI summary
Cylinder lock with anti-breaking function can be implemented in locking devices with increased security for living houses, public and industrial buildings. The cylinder lock consists of inner housing part (1) with rotatable mounted therein inner core (3), in channel (13) of which there is disposed composite cam (7), and outer housing part (2) with rotatable mounted therein outer core (4). Both housing parts (1, 2) are joined by connecting element (5) with weakened section. In the inner core (3) there is formed radial profile core bore (20) in which there is disposed retaining element (21) under the spring (25) and pin (26) pressure. In the inner core (3) there is disposed extender (22), supporting compression spring (12), which pushes first switching element (10a) together with central pin (19) until its engagement in a forward position with first transmitting plate (9) in the composite cam (7), so that the retaining element (21) gets out of the radial profile core bore (20) and falls onto the extender (22) behind the first switching element (10a).