Lock Cylinder Unauthorized Key Detection
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Solution Overview
Problem
Existing lock cylinders fail to detect unauthorized unlocking attempts effectively, allowing manipulation attempts to go undetected and enabling repeated attempts.
Innovation Solution
The catch pocket is positioned next to the key withdrawal position and outside the core's pocket area, ensuring that a non-authorized key cannot lock or be removed, with a housing magnet providing additional blocking force to prevent core rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic locking element is used in conventional lock cylinders, then the locking mechanism can be controlled by a key magnet, but unauthorized keys without magnets can be freely inserted and removed without detection
Solution Approach 1:
The locking cylinder is segmented into distinct functional zones: the core with the pocket for the locking element, and the housing with the catch pocket positioned separately. This segmentation allows the locking element to be held in different positions (inside the core or in the catch pocket) depending on whether an authorized or unauthorized key is used, enabling detection of unauthorized attempts.
Solution Approach 2:
The catch pocket acts as an intermediary structure between the core and the external environment. It provides an intermediate position for the locking element that is accessible from the housing but not from the core, serving as a detection zone for unauthorized key attempts.
2Ease of operation
If the catch pocket is positioned inside the core's pocket area, then the locking element can be easily controlled, but unauthorized keys can potentially manipulate the core rotation
Solution Approach 1:
The catch pocket is positioned in a different spatial dimension relative to the core's pocket area. It is located in the housing adjacent to the key release position, outside the area covered by the core's pocket when the key is in the release position. This dimensional separation ensures that the locking element cannot be simultaneously accessed by both the core and the catch pocket, preventing unauthorized manipulation.
3Ease of operation
If the locking element is held entirely within the core, then the key magnet can easily retain it, but the locking mechanism cannot detect unauthorized attempts
Solution Approach 1:
The catch pocket is pre-positioned in the housing adjacent to the key release position, ready to receive the locking element if an unauthorized key is used. This preliminary arrangement ensures that when an unauthorized key is inserted, the locking element will naturally be held in the catch pocket by the housing magnet, automatically triggering the detection mechanism without requiring additional active components.
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
This design ensures that unauthorized key attempts are easily detected, as the core movement is blocked, and the locking mechanism prevents further rotation, securely locking the cylinder.
Implementation Method 1
a key magnet arranged in the key and a magnetic locking element guided in a pocket of the core, wherein the force of the key magnet is dimensioned to hold the locking element within the core
Implementation Method 2
the housing has a catch pocket for partially receiving the locking element and the force of the key magnet is dimensioned to hold the locking element within the core
Data Source
Figure 1~2
Figure 3~5
AI summary
A lock cylinder (1) with a key (2) authorized to open it has a locking element (15) that is attracted by a key magnet (14) and guided in a core (4). The locking element (15) faces catch pockets (17, 18) in the housing (3). With a key not authorized to open it, a locking element (15) held in the catch pocket (17, 18) prevents the core (4) from turning back into a key removal position. A key (22) not authorized to open it, without a key magnet (14), is thus trapped in the lock cylinder (1).