Cooking Appliance Door Locking Head for Manual Emergency Release
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Solution Overview
Problem
Existing cooking appliances with emergency unlocking mechanisms face issues such as reduced stability due to easy accidental unlocking and difficulty for ordinary users to unlock the door, especially in emergency situations like power failures or fires, where the motor-operated locking systems fail.
Innovation Solution
A cooking appliance design that incorporates a panel unit which can be rotated to cover the water tank entrance, featuring a cam protruding port and guides for precise movement, and a door locking device with a latch system that prevents accidental opening while allowing easy manual unlocking in emergencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an emergency unlocking device is provided in a small space in the casing, then the door can be unlocked in emergencies, but it is difficult for users to visually check whether the device is moved to a release position and the difficulty of unlocking the door is high
Solution Approach 1:
The patent moves the emergency unlocking device from a concealed position inside the casing to the outer surface of the door, changing its spatial dimension and making it accessible to users. The releasing portion is specifically designed to be operable from the exterior, allowing users to pull the door outward to unlock it during emergencies without needing to access internal components.
2Ease of operation
If the unlocking guide protrudes in the same direction as the unlocking cam and is easily pressed to unlock the door, then the door can be unlocked, but the door is more likely to be unlocked arbitrarily and stability is reduced
Solution Approach 1:
The patent employs asymmetric design in the locking mechanism where the cam and unlocking guide have specific geometric relationships that allow unlocking only in the intended direction. The cam rotates to engage or disengage from the unlocking guide in a controlled manner, preventing arbitrary unlocking while maintaining ease of operation through the asymmetric geometry that guides the unlocking motion.
Solution Approach 2:
The locking mechanism is designed with preliminary anti-action through the cam profile and unlocking guide configuration that prevents unintended unlocking. The cam is positioned and shaped to resist premature engagement release, requiring a deliberate and sufficient pulling force on the door to initiate the unlocking sequence, thereby preventing accidental or arbitrary unlocking while maintaining stability.
3Extent of automation
If a motor is used to rotate the door locking switch or locking member, then the door can be locked and unlocked automatically, but in the event of an emergency such as power failure or fire, the motor is not operated, so the door is not unlocked
Solution Approach 1:
The patent introduces a manual emergency unlocking mechanism as an intermediary system that operates independently of the motor. The emergency unlocking device with its cam and unlocking guide provides a mechanical backup that can be activated by pulling the door, serving as a mediator between the user and the locking mechanism when electrical power is unavailable during emergencies.
Data Source
AI summary
A cooking appliance includes a casing having a cavity therein, and a door opening and closing the cavity. In addition, a door locking device disposed in the casing catches the door to turn the door into a locked state. The door locking device includes a rotatable latch, and a locking head assembled to the latch. When a head fastener coupling the locking head to the latch is separated from the locking head, the locking head is separable from the latch.