Pannier Box Lock Mechanism Preventing Premature Key Removal
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Solution Overview
Problem
Conventional lock mechanisms for pannier boxes can lead users to misidentify an incomplete lock state as a complete lock state due to the cam of the key cylinder rotating in an incomplete lock position, allowing the key to be removed prematurely.
Innovation Solution
A lock mechanism that includes a lock lever, key cylinder, cam, lock plate, and engaging parts, where the cam engages with a lock hole only when the lock lever is in the proper lock position, preventing the key from being removed unless the lock is fully engaged, and includes a projection that restricts the cam's rotation in the unlock position to prevent misidentification of the lock state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cam of the key cylinder is allowed to rotate in the incomplete lock state, then the key can be removed in the incomplete lock state, but the user misidentifies the incomplete lock state as the complete lock state
Solution Approach 1:
The extension (78) projects on the rotation path of the cam (75) in the unlock position of the lock lever (51). When the lock lever is in the unlock position, the extension projects on the rotation path of the cam to cause the cam to abut on the extension, preventing the key from rotating to reach the lock position on the key cylinder. This preliminary blocking action prevents the harmful outcome of key removal in incomplete lock state before it can occur.
2Ease of operation
If the key can be removed in the incomplete lock state, then the operation is convenient, but the locking security is compromised
Solution Approach 1:
The extension (78) is positioned to block the cam's rotation path when the lock lever is in the unlock position. This preliminary preventive measure ensures that even if the user attempts to remove the key in an incomplete lock state, the cam abuts on the extension and the key cannot be removed, thereby preventing theft risk before it can materialize.
3Reliability
If the cam rotation is restricted only in the unlock position, then the key cannot be removed in incomplete lock state, but the structure becomes more complex
Solution Approach 1:
The lock plate (53) is segmented to include an extension (78) that projects from the main body. This extension specifically blocks the cam's rotation path only when the lock lever is in the unlock position, without interfering with normal locking operations. The segmentation allows the extension to be added as a relatively simple structural element rather than redesigning the entire lock mechanism.
Solution Approach 2:
The extension (78) acts as an intermediary element between the cam (75) and the lock plate (53). When the lock lever is in the unlock position, the extension intermediates by blocking the cam's rotation path, causing the cam to abut on the extension. This intermediary structure provides a simple mechanical solution to prevent key removal in incomplete lock state without requiring complex control systems.
Data Source
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AI summary
In locking a lock lever of a pannier box with a key cylinder, a key is incapable of being removed unless the lock lever is in a proper lock position. A lock mechanism 50 for a pannier box 17 includes a lock lever 51 including a key cylinder 52, a lock plate 53 provided with a first lock hole 57 configured to engage with a cam 75 of the key cylinder 52, an engagement lever 61 removably engages with a pannier stay 30, and a lock hook 77 configured to engage with a lock part 65 of the engagement lever 61 engaging with the pannier stay 30. The lock plate 53 is partially provided with an extension 78. In an unlock position of the lock plate 53 where the lock hook 77 does not engage with the lock part 65, the cam 75 of the key cylinder 52 abuts on the extension 78 to prevent further rotation of the cam 75, which makes a key 74 incapable of rotating to reach the lock position on the key cylinder 52 and hence incapable of being removed.