Locking Cylinder Core Pin Tilt Mechanism for Anti-Picking
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Solution Overview
Problem
Existing lock cylinders offer high security against tipping but have limited protection against unauthorized unlocking using the picking method, and authorized locking is made difficult due to the core pin's tendency to tilt and get caught.
Innovation Solution
The first guide collar is separated from the first guide section when the core pin is pushed deeper into the housing than the key's locking recess, allowing the core pin to tilt and block unauthorized access, while remaining guided for authorized key use, with a tapering tip end and additional guide collars to prevent snagging and ensure secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the core pin is guided by guide collars over its entire range of movement to prevent tipping, then security against tipping is improved, but protection against unauthorized unlocking using the picking method deteriorates
Solution Approach 1:
The guide section is divided into two segments: a first guide section with small diameter that guides the core pin during normal operation, and a second guide section with large diameter that allows the core pin to tilt when pushed deeper into the housing. This segmentation enables the core pin to receive different levels of guidance depending on its position, preventing tipping during authorized use while allowing tilting to block unauthorized access.
Solution Approach 2:
The guidance system transitions from a static, continuous guidance approach to a dynamic one where the level of guidance changes based on core pin position. When the core pin is in the normal range of movement, it is guided by the first guide section to prevent tipping. When pushed deeper into the housing beyond the first guide section, the core pin can tilt freely to block unauthorized unlocking attempts.
2Reliability
If the second guide collar is arranged on the end of the core pin facing the housing pin to provide guidance, then guidance reliability is improved, but authorized locking becomes difficult due to the core pin tilting and getting caught
Solution Approach 1:
Different sections of the core pin are given different properties: the first guide collar has a small diameter to fit the first guide section and prevent tilting during normal operation, while the second guide collar has a large diameter to fit the second guide section and allow tilting when needed. This local differentiation ensures that guidance is provided only where appropriate, preventing the core pin from getting caught during authorized locking while maintaining guidance reliability during normal operation.
3Adaptability or versatility
If the core pin is designed with a long tip end to scan deep locking recesses, then scanning capability is improved, but the core pin becomes more prone to snagging during authorized closing
Solution Approach 1:
The tip end of the core pin is designed with a continuous taper instead of sharp edges or corners. This curved, tapered shape allows the tip to smoothly navigate through the locking recesses without catching on the edges of the key's locking recesses, eliminating snagging during authorized closing while maintaining the ability to scan deep locking recesses.
Data Source
Figure 1~3
Figure 4~5
AI summary
A locking cylinder (1) with a core (3) movable relative to a housing (2) and with a pin tumbler (7) for selectively blocking the movement of the core (3) has a core pin (10) with several guide collars (13-15). During operation of the locking cylinder (1), the guide collars (13-15) are guided by guide sections (22, 23). When the core pin (10) is pushed out of a locking channel (5), at least one of the guide collars (13) is separated from the guide section (22), allowing the core pin (10) to pivot. This provides the locking cylinder (1) with a high level of protection against unauthorized unlocking by picking.