Automatic Anti-Theft Latch Mechanism for Door Locks
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Solution Overview
Problem
Existing door locks with anti-theft latches require separate operations to achieve complete anti-theft functionality, which is inconvenient and may result in unnecessary impact on the door frame when the anti-theft latch is engaged.
Innovation Solution
A lock design that includes a case body with a latch and an anti-theft latch, where the anti-theft latch automatically moves to an extended anti-theft position when the door is closed, and can be moved to a non-anti-theft position by pivotal movement of a connecting member, allowing direct opening of the door without additional operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anti-theft latch is manually moved to the anti-theft position before closing the door, then the door security is improved, but the operation complexity increases and user convenience deteriorates
Solution Approach 1:
The anti-theft latch automatically moves to the anti-theft position before the door is closed, performing the security function in advance without requiring manual operation. This preliminary action eliminates the need for users to manually engage the anti-theft mechanism while ensuring door security is maintained.
Solution Approach 2:
The lock mechanism automatically manages the anti-theft latch positioning based on door status, serving itself without user intervention. The system detects door closing and autonomously engages the anti-theft latch, making the security function self-regulating and eliminating manual operation requirements.
2Reliability
If the anti-theft latch remains in the anti-theft position after door closing, then security is maintained, but additional operations are required to open the door reducing ease of use
Solution Approach 1:
The anti-theft latch dynamically changes its position based on door status and operating device activation. When the operating device is activated to open the door, the anti-theft latch automatically transitions from the anti-theft position to the non-anti-theft position, enabling smooth door opening without manual intervention while maintaining security when the door is closed.
Solution Approach 2:
The system prepares for door opening by automatically retracting the anti-theft latch in advance when the operating device is activated, so that the door can be opened directly without requiring users to manually disengage the anti-theft mechanism.
3Reliability
If the anti-theft latch is engaged while the door is being closed, then security is improved, but impact on the door frame may occur causing harmful effects
Solution Approach 1:
The anti-theft latch is activated in advance before the door fully closes, allowing it to be already in position when the door reaches the closed state. This timing coordination prevents the latch from engaging during door closure, eliminating impact on the door frame while ensuring security is maintained.
Solution Approach 2:
The system prevents harmful impact by coordinating the anti-theft latch activation with door closure status, ensuring the latch is already positioned before the door closes rather than engaging during the closing motion, thereby avoiding forceful contact with the door frame.
Data Source
AI summary
A lock capable of automatically locking a door after closing includes a latch, an anti-theft latch, and a stop-latch. When the door is in an open position, the stop-latch is in an extended position to prevent the anti-theft latch from moving to an anti-theft position. When the door pivots to a closed position, the stop-latch moves to a retracted position, and the anti-theft latch moves to the anti-theft position. When the latch is moved to an unlatching position through normal operation, the anti-theft latch moves to a non-anti-theft position. Thus, the anti-theft latch will be in the anti-theft position when the door is in the closed position, and the anti-theft latch will move to the non-anti-theft position when the door is opened through normal operation.