Lock Pin Segmented Bore for Anti-Panic Lock Reliability
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Solution Overview
Problem
Conventional lock pins for anti-panic locks often malfunction due to over-tightening, lack a reliable connection between the lock follower and handle, and cannot be easily shortened to fit different door thicknesses.
Innovation Solution
A lock pin with a rectangular or square cross-sectional profile featuring an axial threaded bore and a clearance bore, along with a diagonally designed slot in the second end section, allows for a non-rotatable connection with a one-piece lock follower, ensuring a secure attachment and adaptability to varying door thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lock pin is threaded and fastened with a screw from the opposite side of the door, then the lock pin is firmly connected to the lock follower, but the lock pin is repeatedly screwed too tightly so that the lock follower can no longer be rotated
Solution Approach 1:
The axial bore is divided into two distinct sections: a threaded bore section for secure connection and a clearance bore section for rotation. This segmentation allows the lock pin to be firmly connected through the threaded portion while the unthreaded clearance portion enables free rotation of the lock follower without over-tightening risks.
Solution Approach 2:
Different sections of the lock pin have different structural properties: the first end section has a threaded bore for strong connection, while the second end section has a clearance bore for rotation. This local differentiation of structural quality resolves the contradiction between needing strong connection and maintaining rotational freedom.
2Reliability
If the lock pin is inserted into the lock follower during assembly without a fixed connection, then the lock follower can be rotated, but the lock pin is not firmly connected to the lock follower
Solution Approach 1:
The axial bore is divided into a threaded section for secure connection and a clearance section for rotation. This allows the lock pin to achieve both firm connection (via threading in the first end section) and rotational freedom (via the unthreaded clearance bore in the second end section).
Solution Approach 2:
Different sections of the lock pin have different structural properties: the first end section has a threaded bore for strong connection, while the second end section has a clearance bore for rotation. This local differentiation resolves the contradiction between connection strength and rotational freedom.
3Ease of manufacture
If the lock pin is designed with a standard structure, then the manufacturing is simple, but the lock pin can hardly be shortened to adapt to different door thicknesses
Solution Approach 1:
The lock pin is segmented into distinct functional sections (threaded bore section and clearance bore section) with different purposes. This segmentation allows independent optimization of each section and enables easy shortening of the overall length to adapt to different door thicknesses while maintaining manufacturing simplicity through standardized section designs.
Solution Approach 2:
The lock pin design allows modification of the length parameter (overall length, threaded bore length, clearance bore length) to adapt to different door thicknesses. The standardized section structure maintains ease of manufacture even when length parameters are changed.
Data Source
Figure 1a~2b
Figure 3~4
AI summary
The pin (1) has an axial hole partially designed as a threaded hole in an end section for receiving a threaded pin (3), and as a free hole in another end section. The free hole has a smaller diameter than that of the threaded hole. The latter end section is provided with an axial slot. The threaded pin includes thread-free extension, which includes a diameter smaller than that of a threaded section of the threaded pin and larger than that of the free hole. The thread-free extension includes a conical attachment at a free end. Stoppers (9) protrude from an outer surface of the pin.