Domestic dishwasher
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Solution Overview
Problem
Household dishwashers face challenges in efficiently and smoothly moving receptacles in and out, often requiring high pull-out forces and risking tilting or jamming, due to inadequate guide mechanisms.
Innovation Solution
A guide device with a running rail and locking element that synchronizes the movement of receptacles, allowing them to be moved in two stages, ensuring a low and constant pull-out force by fixing the receptacle to the rail initially and then releasing it for complete removal, using rollers and an elastically deformable locking element for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional guide mechanism is used to move receptacles in and out, then the receptacle can be moved, but high pull-out forces are required and tilting or jamming may occur
Solution Approach 1:
The guide device is segmented into multiple functional components: a running rail for linear movement, a locking element with engagement protrusions for positional fixation, and rollers for smooth movement. This segmentation allows each component to perform its specific function optimally, reducing overall system complexity and improving reliability
Solution Approach 2:
The locking element is preliminarily positioned to engage with the receptacle before movement begins. The engagement protrusions are pre-configured to align with corresponding recesses, ensuring that the receptacle is securely locked to the running rail at the start of the movement sequence, preventing tilting and jamming during operation
2Device complexity
If the receptacle is moved directly without fixation, then movement is simple, but the receptacle may tilt or jam during movement
Solution Approach 1:
The locking element acts as an intermediary between the receptacle and the running rail. It mediates the movement process by providing engagement protrusions that temporarily secure the receptacle to the rail, ensuring stable and controlled movement without direct rigid connection
Solution Approach 2:
The system changes the engagement parameter dynamically: the locking element engages with the receptacle at specific positions during movement, transitioning from a locked state to a free state. This parameter change allows the receptacle to be securely guided during critical phases of movement while maintaining simplicity
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
This solution enables smooth, steady, and easy loading/unloading of receptacles by maintaining a low pull-out force and preventing tilting, ensuring efficient operation and reduced risk of damage.
Implementation Method 1
a locking element (24), which is designed to engage around a roller (37) with a form fit to fix the receptacle (13) for items to be washed to the running rail (18)
Data Source
AI summary
A household dishwasher includes a washing container, a receptacle for items to be washed, and a guide device configured to enable movement of the receptacle into and out of the washing container. The guide device includes a running rail and a locking element which is configured to fix the receptacle to the running rail when the receptacle is moved out of the washing container until the running rail is in a state in which it is moved completely out of the washing container. The locking element releases the receptacle when the running rail is in the state in which it is moved completely out of the washing container, thereby bringing the receptacle into a state in which the receptacle is moved completely out of the washing container.