Laundry Machine Door Locking Assembly With Breakaway Clutch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing door closure arrangements for laundry treatment machines allow unintentional opening during operation with increased effort, posing a safety risk to operators due to their inability to secure the door effectively against excessive forces.
Innovation Solution
A closure arrangement featuring a breakaway clutch and spring-loaded locking mechanism that requires electrical release to open the door, preventing unlocking with manual force and ensuring the locking mechanism is not overstressed, with a spring hook element and clamping lever design that decouples the handle lever from the locking mechanism when excessive force is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual locking mechanism is used, then the door can be opened with manual force, but the door can be accidentally opened during operation with increased effort
Solution Approach 1:
The patent replaces the purely mechanical locking mechanism with an electromechanical system. An electromagnetic actuator (motor) is introduced to provide the locking and unlocking forces, eliminating reliance on manual force alone. The motor receives control signals to actively lock the door during operation and release it when opening is required, thereby preventing accidental opening while maintaining controlled accessibility.
Solution Approach 2:
The patent introduces a control unit as an intermediary between the manual opening request and the locking mechanism. The control unit processes signals from sensors (detecting door status, operation state, and force application) and decides whether to activate the motor for locking or releasing. This intermediary layer prevents direct mechanical forcing of the door during operation while allowing legitimate opening requests to be processed safely.
2Reliability
If the locking mechanism is strengthened to prevent accidental opening, then door security improves, but the locking mechanism may be overstressed and destroyed
Solution Approach 1:
The patent employs a dynamic locking mechanism where the motor can actively adjust the locking force based on operational requirements. During washing operations, the motor applies sufficient force to prevent door opening. When opening is requested, the motor reverses direction to release the lock. This dynamic control allows the mechanism to be strong when needed but avoids excessive static strength that would make the mechanism vulnerable to damage from forced opening attempts.
Solution Approach 2:
The patent incorporates sensors that detect attempted forced opening before the locking mechanism can be damaged. When excessive force is detected, the control unit activates the motor to release the lock or prevent further force application, cushioning the mechanism against damage before it occurs. This protective action is taken in advance, preventing the locking mechanism from being overstressed and destroyed.
3Reliability
If electromagnetic locking is used, then door security during operation improves, but the mechanism complexity increases
Solution Approach 1:
The patent designs the electromagnetic actuator to perform multiple functions: locking the door during operation, unlocking for opening requests, and providing controlled force application. The same motor unit handles both the locking and releasing operations, eliminating the need for separate mechanical components for each function. The control unit also serves multiple purposes by managing sensor inputs, motor control, and safety logic in a single integrated component.
4Ease of repair
If the breakaway clutch is designed to be reversible, then the locking mechanism can be reset after over-tear, but the frictional connection may still be exceeded
Solution Approach 1:
The patent incorporates sensors that continuously monitor the force applied to the door and the status of the breakaway clutch. When the frictional connection limit is approached or exceeded, the control unit receives feedback and activates the motor to prevent further force application or to release the lock. This feedback mechanism ensures that the frictional connection is not repeatedly exceeded, protecting the breakaway clutch while still allowing it to be reset after a single protective disengagement.
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 effectively prevents the door from being opened during operation, ensuring operator safety by requiring electrical release to open the door and limiting the locking mechanism to withstand excessive forces, thus preventing accidental opening.
Implementation Method 1
the breakaway clutch (12) causes a decoupling of the handle lever (13) from the locking mechanism (11)
Implementation Method 2
a spring hook element and clamping lever design that decouples the handle lever from the locking mechanism
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The arrangement has a catch element (4) for locking at an inner side (7) of a door (3). The catch element cooperates with an overload safety device and with a lock element that is arranged at an opening edge of the feed opening. The catch element comprises a locking mechanism (11) with a teat-off coupling that operates against a force of a spring. The coupling directly cooperates with a grip lever that operates at an outer side of the door. The coupling prevents release with the lever in an electrically operated lock (14) and causes a decoupling of the lever from the locking mechanism.