Dishwasher Roller Guide Design to Prevent C-Rail Twisting and Friction
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Solution Overview
Problem
Household dishwashers experience twisting and high friction issues when extracting or inserting C-rails, leading to scratching and grinding noises due to contact between rollers and C-rails, which affects user friendliness.
Innovation Solution
A household dishwasher design featuring a support element with a C-shaped profile and rollers arranged to prevent twisting, where the first roller runs along the lower area and the second roller along the upper area, aligned to guide the support element smoothly and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the C-rail is twisted due to heavy items in the receptacle, then the rollers contact the C-rail parts moving in reverse direction, but this leads to scratching and grinding noises and high friction forces
Solution Approach 1:
The support element is divided into separate upper and lower running areas that are guided independently by different rollers. The first roller guides the lower running area while the second roller guides the upper running area, preventing twisting and reverse-direction contact between roller parts and C-rail surfaces.
Solution Approach 2:
The patent introduces an intermediary guidance mechanism where the upper and lower running areas are independently guided by separate rollers. This intermediary guidance prevents direct harmful contact between rollers and C-rail by maintaining proper alignment and preventing twisting.
2Stability of the object's composition
If the rollers are arranged to guide both upper and lower running areas, then twisting is prevented, but the device complexity increases
Solution Approach 1:
The guidance system is segmented into two independent roller-guidance pairs: the first roller for the lower running area and the second roller for the upper running area. This segmentation allows each roller to be optimized for its specific guidance task while maintaining overall system stability and preventing twisting.
Solution Approach 2:
The patent adds a dimensional aspect to the guidance system by independently guiding both the upper and lower running areas of the support element. This multi-dimensional guidance approach prevents twisting by constraining the support element in multiple directions simultaneously, achieving stability without excessive complexity.
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 design prevents twisting and direct contact between moving parts, reducing friction forces and noise, enhancing user friendliness and mechanical stability during the extraction and insertion of wash items.
Implementation Method 1
the rollers roll on their upper side over an upper running area of the C-rail
Data Source
AI summary
A household dishwasher includes a dishwasher cavity, and first and second rollers which are rotatably mounted in a roller holder that is fastened to the dishwasher cavity. A support element supporting a receptacle for items to be washed is movably mounted relative to the roller holder with the aid of the first roller and the second roller in such a way that the receptacle is movable between a position in which the receptacle is inserted into the dishwasher cavity and a position in which the receptacle is extracted from the dishwasher cavity. The support element has an upper running area and a lower running area, with the first roller being spaced apart downward from the upper running area and running along the lower running area, and with the second roller being spaced apart upward from the lower running area and running along the upper running area.