Door Lock Switch Mechanism for Forced-Open Power Cutoff
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Solution Overview
Problem
Existing door locks for electrical appliances fail to rapidly and safely cut off the power supply when the door is forcibly opened, especially if components like the cam or lock pin are damaged.
Innovation Solution
A door lock system featuring a switch means, a switch driving means, and a driving slider, where the switch driving means, such as a swing lever, is capable of opening the switch means, and the driving slider is driven by a door hook to move the switch driving means, ensuring the power supply is cut off even if other components are damaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional door lock mechanism is used, then the door can be locked securely, but the power supply cannot be cut off rapidly when the door is forcibly opened
Solution Approach 1:
The door lock system is segmented into independent functional modules: the cam mechanism for normal locking, the driving slider for detecting door hook position, and the swing lever for direct switch actuation. This segmentation allows the switch opening function to be independently triggered by the driving slider when the door hook moves, ensuring rapid power cutoff without relying on the cam mechanism.
Solution Approach 2:
The driving slider acts as an intermediary component between the door hook and the swing lever. When the door is forcibly opened and the door hook moves, it directly drives the driving slider, which in turn pushes the swing lever to open the switch. This intermediary mechanism ensures that the power supply is cut off rapidly and reliably, even if other components like the cam are damaged.
2Reliability
If the door lock relies on components like cam or lock pin, then normal locking function is achieved, but the system fails to cut off power when these components are damaged
Solution Approach 1:
The driving slider is designed to be directly driven by the door hook's movement, making the system self-monitoring. When the door is forcibly opened, the door hook's displacement automatically drives the driving slider to push the swing lever and open the switch, without requiring additional sensors or control systems. This self-service mechanism ensures reliable power cutoff even when other components are damaged.
Solution Approach 2:
The swing lever serves multiple functions: it is actuated by the driving slider during forced door opening to open the switch, and it can also be actuated by the lock pin during normal unlocking operations. This multi-functionality reduces the need for separate components while maintaining reliable power cutoff capability under various conditions.
3Reliability
If a simple locking mechanism is used, then device complexity is reduced, but sensitivity to detect forced door opening is insufficient
Solution Approach 1:
The swing lever is designed as a dynamic component that can rotate between a first position (switch closed) and a second position (switch open). The driving slider dynamically pushes the swing lever during forced door opening, and the spring provides dynamic restoring force. This dynamic mechanism enables high sensitivity in detecting forced door opening while maintaining relatively simple structure.
Solution Approach 2:
The spring is pre-loaded to bias the swing lever toward the switch-closed position during normal operation. This preliminary action ensures that the swing lever is ready to be quickly pushed to the open position when the driving slider acts upon it during forced door opening, achieving high detection sensitivity without complex mechanisms.
Data Source
AI summary
The present application relates to a door lock and a control circuit thereof. The door lock includes a switch means, a switch driving means capable of opening the switch means, and a driving slider. The driving slider is capable of driving the switch driving means. The driving slider is capable of being driven by a door hook. The switch driving means (that is, a swing lever) and a lock pin are capable of jointly controlling opening of the switch means. The switch driving means (that is, the swing lever) is driven by a mechanical structure (that is, the driving slider), and the lock pin can be driven by an electronic signal and a circuit structure (for example, a second current loop), thereby improving the sensitivity and reliability in disconnecting the power supply under abnormal working conditions.