Tubular Lock Spindle Axial Passage Anti-Picking
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Solution Overview
Problem
Existing lock devices are vulnerable to unauthorized opening using plastic barrels from pens, as these can be molded to fit and turn tubular locks, lacking effective deterrents against such picking methods.
Innovation Solution
A lock device with a locking spindle and driver structure featuring combination and driver pins, along with an elongated passage that receives the key's extended portion, forming a shear line interface, preventing unauthorized tubular structures from fully rotating the locking spindle by maintaining driver pins on one side of the shear line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional tubular lock without a passage is used, then the lock structure is simpler, but the lock is vulnerable to unauthorized opening using molded plastic barrels
Solution Approach 1:
The lock device is segmented into distinct functional zones: a passage extending axially through the locking spindle, combination pins in locking spindle bores, and driver pins in driver structure bores. This segmentation creates multiple independent security mechanisms that work together to prevent unauthorized opening while maintaining a relatively simple overall structure.
Solution Approach 2:
The passage acts as an intermediary element that receives the key's extended portion and transmits rotational force to the locking spindle. The passage's presence prevents unauthorized tubular structures from fully rotating the locking spindle by maintaining driver pins on one side of the shear line, thus mediating between the key and the locking mechanism.
2Reliability
If a passage is added to the locking spindle to receive the key's extended portion, then security against unauthorized opening is improved, but the manufacturing complexity increases
Solution Approach 1:
The locking spindle is manufactured as a segmented component with a continuous axial passage running through it. This passage is integrated into the spindle's structure during manufacturing, allowing the key's extended portion to pass through and engage with the driver structure while maintaining a straightforward manufacturing process.
Solution Approach 2:
The passage serves multiple functions: it guides the key's extended portion into proper alignment, transmits rotational force from the key to the locking spindle, and prevents unauthorized tubular structures from fully rotating the spindle. This multi-functionality reduces the need for additional separate components, thereby simplifying manufacturing.
3Reliability
If driver pins are positioned across the shear line, then the locking mechanism is more secure, but unauthorized tubular structures can still fully rotate the locking spindle
Solution Approach 1:
The passage acts as a mediating structure that selectively allows the key's extended portion to pass through while blocking unauthorized tubular structures. When the key is inserted, its extended portion fills the passage and enables the driver pins to be positioned across the shear line for secure locking. Unauthorized structures cannot fill the passage completely, preventing full rotation even if driver pins are positioned across the shear line.
Solution Approach 2:
The shear line interface between the driver structure and locking spindle is designed with specific local qualities: driver pins are positioned relative to the shear line in a controlled manner, and the passage's dimensions and positioning are optimized to ensure that only authorized keys can position the driver pins correctly across the shear line while preventing unauthorized rotation.
Data Source
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AI summary
A lock device for use with a key is disclosed. The lock device includes a locking spindle including a plurality of locking spindle bores and a passage extending axially along an axial length of the locking spindle, and a driver structure including a plurality of driver structure bores. An interface between the driver structure and the locking spindle forms a shear line. The lock device also includes a plurality of combination pins in the plurality of locking spindle bores, and a plurality of driver pins in the driver structure bores in the driver structure, the plurality of driver pins being respectively associated with the plurality of combination pins.