Door Lock with Auxiliary Blocking Member to Prevent Manipulation
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Solution Overview
Problem
Conventional door locks for domestic appliances, such as washing machines, can be inadvertently or intentionally manipulated into a locking position without the door being closed, leading to unsafe operating cycles due to the presence of magnets in the vicinity of reed switches, which can cause the locking element to engage prematurely.
Innovation Solution
A door lock system featuring a locking member that is blocked in its unlocking position by an auxiliary member until the door is properly closed, requiring a two-fold manipulation to engage the locking position, including the use of a separate auxiliary member that must be manually moved from a blocking position to a release position to allow the locking member to transition into the locking position, enhancing security against unintended or deliberate manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a reed switch and magnet system is used for detecting door closure, then the door lock can be actuated automatically when the door is closed, but the system becomes vulnerable to manipulation by external magnets that can trigger false locking without actual door closure
Solution Approach 1:
The patent introduces an auxiliary member as an intermediary between the door closure detection and the locking member actuation. This auxiliary member must be physically moved to a release position to enable the locking member to engage, creating an additional control layer that prevents direct manipulation via external magnets while maintaining automatic operation through the closing element mechanism
Solution Approach 2:
The locking mechanism is segmented into functionally independent components: a closing element for detecting door closure, an auxiliary member for enabling locking, and a locking member for actual engagement. This segmentation ensures that actuation of one component does not automatically trigger the others, requiring a specific sequence of operations that cannot be bypassed by external magnetic fields
2Ease of operation
If the locking member is directly actuated by the closing element upon door closure, then the locking operation is simple and quick, but the system allows inadvertent or intentional manipulation into locking position without proper door closure
Solution Approach 1:
The auxiliary member must be moved to the release position as a preliminary action before the locking member can be actuated. This preliminary step ensures that the door has been properly closed and provides a mechanical barrier against inadvertent or intentional manipulation, while still allowing quick operation once the door is closed by utilizing the closing element's movement to automatically position the auxiliary member
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 system significantly enhances security by requiring a deliberate and two-step action to engage the locking mechanism, reducing the likelihood of accidental or intentional manipulation into a locking position, thus preventing unsafe operating cycles of domestic appliances.
Implementation Method 1
a closing element which, on closing of the door, enters an insertion opening of a lock assembly containing the locking member and the auxiliary member and thereby strikes the auxiliary member
Data Source
AI summary
A door lock for a domestic electrical appliance includes a locking member which is electrically switchable between an unlocking position and a locking position, which locking member in the unlocking position allows a closed door of the domestic appliance to be opened and in the locking position is in blocking engagement with a blockable component at least when the door is closed, and an auxiliary member, separate from the blockable component, which is movable in dependence on the closing of the door from a release position into a blocking position. The blocking engagement effects blocking of the closed door against opening. In the release position, the auxiliary member allows the locking member to be transferred from the unlocking position into the locking position; in contrast, in its blocking position, the auxiliary member blocks the locking member against being transferred from the unlocking position into the locking position.