Appliance Door Locking Pin and Switch Layout for False Signal Prevention
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Solution Overview
Problem
Existing door-locking devices for electrical household appliances lack effective mechanisms to prevent false opening signals and ensure secure locking, particularly in conditions where the door is partially closed or locked.
Innovation Solution
A door-locking device incorporating a magnetic actuator and detection switch with increased hysteresis, utilizing a movable locking pin and control members to manage the latching slider's movement, ensuring accurate detection of door closure and locking states through electromechanical control, preventing false opening signals and maintaining secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple detection switch is used to detect door closure, then the device complexity is reduced, but false opening signals occur and reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the detection switch monitors the latching slider position and provides feedback to the control unit. The control unit adjusts the locking state based on this feedback, creating a closed-loop control system that prevents false opening signals while maintaining reliable door locking.
Solution Approach 2:
The patent introduces an intermediary control unit that mediates between the detection switch and the locking mechanism. This intermediary processes the detection signals and coordinates the locking pin movement, preventing direct coupling that could cause false signals while maintaining system reliability.
2Reliability
If the locking pin moves freely to engage the latching slider, then the locking mechanism is simple, but false opening signals are generated when the door is partially closed
Solution Approach 1:
The patent applies preliminary action by requiring the door to be fully closed before the locking pin can engage the latching slider. The detection switch must first confirm proper door closure, then the locking mechanism is activated, preventing false locking in partially closed positions.
Solution Approach 2:
The patent implements dynamic control where the locking pin's movement is controlled based on real-time detection of door closure status. The system transitions between locked and unlocked states dynamically based on the latching slider position, preventing static false locking conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the reliability of door locking by preventing false opening signals and maintaining the locked state effectively, ensuring the appliance remains secure and operational.
Implementation Method 1
A door-locking device (1) for electrical household appliances is proposed... comprising an actuator (20)... a locking pin (11) controllable by the actuator
Implementation Method 2
a detection switch (45), able to switch between an open position and a closed position following a movement of the latching slider (7), said detection switch comprising a fixed contact element (45e) and a movable contact element (45c) resiliently stressed in closure towards the fixed contact element
Data Source
AI summary
A door-locking device (1) including an actuator (20); a locking pin (11) controllable by the actuator (20) and adapted to cooperate with a movable latching slider (7) to lock a door of an electrical household appliance, the locking pin (11) being movable between a rest position, wherein the locking pin allows the latching slider (7) to move, and a lock position, wherein the locking pin prevents the latching slider (7) from moving; a detection switch (45) able to switch between an open position and a closed position following a movement of the latching slider (7), the detection switch (45) including a fixed contact element (45e) and a movable contact element (45c) resiliently stressed in closure towards the fixed contact element (45e), and a movable control member (46) interacting with the movable contact (45c). The control member (46) is also movable by a movement of the locking pin (11).