Locking Cylinder Two-Row Tumbler TSA006 Key Security
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Solution Overview
Problem
TSA locks can be opened unauthorizedly by inserting simple manipulation tools or everyday objects into the keyway, compromising security.
Innovation Solution
A lock cylinder design featuring a cylinder housing with a rotating cylinder core and tumblers arranged in two rows, matched to a TSA006 dimple key with specific coding, where the furthest tumbler is positioned deeper in the key channel, and a core pin interacts with the key tip, making it difficult to duplicate the key and use unauthorized tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard lock cylinder design is used, then the lock can be operated with a key, but it can be easily opened unauthorizedly by inserting simple manipulation tools into the keyway
Solution Approach 1:
The lock cylinder is divided into multiple tumblers arranged in two rows, with each tumbler interacting with corresponding dimples on the key. This segmentation means that unauthorized opening would require manipulating multiple independent components simultaneously, greatly increasing the difficulty compared to single-row designs.
Solution Approach 2:
The patent transitions from a conventional single-row tumbler arrangement to a two-row configuration where tumblers are arranged diametrically opposite each other along the key channel. This dimensional change adds complexity to the keyway manipulation, requiring tools to interact with tumblers in multiple spatial planes.
2Reliability
If the furthest tumbler is positioned deeper in the key channel, then lock picking becomes more difficult, but the key channel becomes longer and more complex
Solution Approach 1:
The furthest tumbler is positioned to interact with the dimple-free end section of the key, which is a predetermined feature of the authorized key design. This preliminary positioning ensures that only a properly formatted key can engage all tumblers in sequence, while unauthorized tools would fail to engage the deepest tumbler or encounter resistance.
Solution Approach 2:
The key channel has varying depth characteristics at different positions, with the furthest section extending deeper to accommodate the interaction with the dimple-free end section. This local variation in depth creates a security feature without requiring the entire key channel to be excessively long.
3Reliability
If a two-row tumbler configuration is used, then security is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The two rows of tumblers are arranged diametrically opposite each other, creating an asymmetric configuration that does not allow for simple copying or manipulation. The asymmetric arrangement of dimples on the key corresponds to this tumbler configuration, ensuring that only a precisely manufactured matching key can operate the lock.
Solution Approach 2:
Instead of having tumblers arranged in a single row from front to back, the patent inverts the arrangement by placing tumblers in two parallel rows facing each other. This inversion changes the manipulation geometry, requiring tools to approach from multiple directions simultaneously, thereby enhancing security while maintaining manufacturability through standardized machining processes.
Data Source
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Figure 5~6
AI summary
The cylinder has a cylinder core (13) rotatable in a cylinder housing (11), where core has a keyway with a key introduction opening (19), and multiple tumblers (15, 17) arranged in two rows along the keyway in opposite direction. The lock cylinder is actuable by a dimpled key including two oppositely arranged flat sides. An end section adjoins a coding section provided with dimples and extends to a key tip, where the dimpled key is a transportation security administration (TSA)006 type.