Appliance Door Lock Mechanism for Low-Force Secure Closure
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Solution Overview
Problem
Conventional locks for home appliances require equal force to fix and separate the door from the cabinet, leading to excessive force needed to close the introduction port during operation, which can prevent safe opening and closing.
Innovation Solution
A lock design with a holder and fastening unit that uses elastic members to differentiate the force required for closing and opening, allowing easier closure with reduced user effort and preventing dislocation, while incorporating a sensing unit to confirm door closure and generate a sound signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock is designed to provide sufficient fastening force to prevent door separation during operation, then the door can be securely fastened, but excessive force is required by the user to close the introduction port
Solution Approach 1:
The lock mechanism is divided into two distinct functional units: a holder unit that provides strong fastening force to secure the door during operation, and a coupling unit that enables easy coupling when the door is closed. This segmentation allows each unit to be optimized for its specific function, resolving the contradiction between secure fastening and ease of closure.
Solution Approach 2:
The lock mechanism transitions between two dynamic states: a coupled state during normal operation where the holder and coupling unit are engaged to provide secure fastening, and a separated state during closure where they are disengaged to minimize user effort. This dynamic switching resolves the contradiction by adapting the fastening force to the operational phase.
2Reliability
If the holder and coupling unit are designed for strong coupling, then the door remains securely fastened during operation, but the coupling unit may become dislocated
Solution Approach 1:
The coupling unit is designed with a nested structure where the holder is inserted into the coupling unit during coupling. This nesting arrangement provides stable positioning and prevents dislocation while maintaining strong fastening force, as the nested geometry naturally constrains the relative positions of the components.
Solution Approach 2:
A stopper acts as an intermediary element between the holder and coupling unit to prevent dislocation. The stopper maintains the proper spacing and alignment of the coupling units, ensuring positional stability while allowing the strong coupling force to be transmitted effectively.
3Ease of operation
If the fastening unit is designed to separate easily from the stopper, then the holder can be coupled easily, but the fastening unit may separate unintentionally
Solution Approach 1:
The fastening unit is designed to be dynamically controllable: it separates easily from the stopper when intended (during coupling operation) but remains reliably retained when not intended. The elastic member provides a controlled release mechanism that responds to user action while preventing unintentional separation through its elastic retention force.
Solution Approach 2:
The elastic member provides self-service by automatically returning the fastening unit to its retained position after separation, and by providing continuous retention force to prevent unintentional separation. This self-regulating mechanism ensures reliable retention without requiring additional active control systems.
4Reliability
If the door is designed to remain closed during operation to prevent opening, then safety is improved, but the user cannot open the door when needed
Solution Approach 1:
The lock mechanism dynamically switches between a locked state during operation that prevents unintended opening and an unlocked state that allows intentional opening. The transition between these states is controlled by the coupling and decoupling of the holder and coupling unit, providing both security and accessibility as needed.
Solution Approach 2:
The lock provides preliminary anti-action by preventing door opening before operation begins (through secure fastening during operation) while allowing intentional opening when needed (through the decoupling mechanism). This resolves the contradiction by providing preventive security against unintended opening while maintaining user control for intentional opening.
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 lock reduces the force needed to close the introduction port, prevents dislocation, and ensures secure fastening even when the fastening unit is dislocated, with a sensing unit confirming closure and managing sound signal magnitude.
Implementation Method 1
a first elastic member for providing force necessary to move the fastening unit away from the introduction port
Implementation Method 2
a second elastic member for providing force necessary to move the actuation unit toward the introduction port
Data Source
AI summary
A lock and a home appliance having the same are disclosed. The lock includes a holder provided at one selected from between a cabinet and a door, a housing provided at the other selected from between the cabinet and the door, a first stopper provided at the housing, an actuation unit configured to reciprocate in the housing, the actuation unit being moved away from the introduction port by the holder when the door to the introduction port is closed, a fastening unit supported by the first stopper, the fastening unit being separated from the first stopper and coupled to the holder when the actuation unit is moved away from the introduction port, a first elastic member for providing force necessary to move the fastening unit away from the introduction port, and a second elastic member for providing force necessary to move the actuation unit toward the introduction port.