Door Lock Manual Release Mechanism to Prevent Re-Locking Cycles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing door lock switch mechanisms in electrical appliances, such as washing machines, often cause confusion and inconvenience due to their operation cycle, where further pulling of the manual release mechanism after reaching the unlocked position can revert the lock back to the locked position, leading to repeated cycles.
Innovation Solution
A door lock mechanism featuring a pen core-like mechanism with a control needle and manual unlocking pull rod, where the control needle indicates the state of the switch, preventing further manual unlocking once the door is unlocked, ensuring that further pulling of the manual unlocking mechanism has no effect on the switch mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single-electromagnet structure with push-push mechanism is used, then the door lock can be manually unlocked, but further pulling of the manual release mechanism causes the lock to revert to locked position, creating operational confusion
Solution Approach 1:
The manual release mechanism is segmented into two independent functional parts: a pull rod for actuating the unlocking action and a control needle for indicating the lock state. This segmentation allows the pulling action to be separated from the state indication, preventing the revert-to-locked behavior and eliminating operational confusion.
Solution Approach 2:
A control needle is introduced as an intermediary element that visually indicates the lock state without being directly coupled to the pulling mechanism. This intermediary allows users to see the state change without the mechanism automatically reverting, breaking the harmful feedback loop of the push-push mechanism.
2Reliability
If the manual release mechanism is pulled repeatedly, then the user can attempt to unlock the door, but the lock alternates between locked and unlocked positions, causing inconvenience
Solution Approach 1:
The control needle provides visual feedback about the current lock state to the user. When the door is unlocked, the control needle moves to a position that indicates this state, allowing the user to see that unlocking is complete and avoid unnecessary repeated pulling actions that would otherwise cause the lock to alternate positions.
3Adaptability or versatility
If the push-push mechanism is used, then the door lock switch can be manually actuated, but the mechanism requires multiple pulling actions to maintain unlocked state, increasing operation time
Solution Approach 1:
The control needle is pre-positioned to indicate the lock state before any pulling action occurs. This preliminary indication allows the user to understand the current state and perform only the necessary single pulling action to unlock, rather than repeatedly pulling to check or maintain the unlocked state, thereby reducing operation time.
Data Source
AI summary
A door lock and an electrical appliance using the door lock. The door lock comprises: a switch housing; a pen core-like mechanism disposed in the switch housing; a control needle (state means) passing out of the pen core-like mechanism; and a manual unlocking pull rod mechanism. The manual unlocking pull rod mechanism is capable of moving towards the control needle and coming into contact therewith. The position of the control needle (state means) indicates the switch state of the door lock, such that when the door lock is in an unlocked position, further pulling of the manual unlocking pull rod mechanism has no effect on the door lock switch mechanism.