Dishwasher Guide Rail Assembly to Prevent Dishrack Wheel Binding
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Solution Overview
Problem
Conventional dishwashers face issues with dishrack movement due to wheel binding caused by opposing forces, which can lead to inefficient loading and unloading processes.
Innovation Solution
A guide rail assembly with upper and lower tracks spaced by a predetermined height and rotatably mounted wheels with diameters less than the track height, allowing the wheels to roll freely without binding, ensuring smooth slidable movement of dishracks within the dishwasher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional wheel mounting is used in dishrack guide rails, then the structure is simple, but wheel binding occurs due to opposing forces
Solution Approach 1:
The patent transitions from a single-plane wheel mounting to a three-dimensional arrangement where wheels are positioned at different heights (upper and lower tracks spaced by predetermined height). This dimensional change allows the wheels to engage with tracks that are offset vertically, eliminating the opposing forces that cause binding in conventional single-plane configurations.
2Force
If wheel diameter is increased, then load bearing capacity improves, but wheel binding is more likely to occur
Solution Approach 1:
The patent divides the single wheel into multiple wheels (upper and lower wheels) that are separately mounted at different heights. Each wheel independently engages with its corresponding track, distributing the load bearing function across multiple contact points. This segmentation allows each wheel to be optimally sized for smooth rolling while collectively supporting the dishrack load.
Solution Approach 2:
By positioning wheels at different vertical levels (upper and lower tracks spaced by predetermined height), the patent creates a three-dimensional wheel arrangement. This dimensional separation allows wheels to roll on parallel tracks without experiencing the opposing forces that would cause binding, while still providing adequate load support through distributed contact.
3Ease of manufacture
If fixed wheel position is used, then manufacturing is simpler, but opposing forces cause wheel binding
Solution Approach 1:
The patent specifies that wheels are positioned at different heights with the upper and lower tracks spaced by a predetermined height. This vertical dimensional separation creates independent wheel-track interfaces that eliminate the opposing force problem. The fixed positions are maintained in the vertical dimension while preventing binding through spatial separation.
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 enables effortless and efficient loading and unloading of dishes by preventing wheel binding, enhancing the usability and operational efficiency of the dishwasher.
Implementation Method 1
at least one pair of wheels comprising upper and lower wheels, which are rotatably mounted to the other of the dishrack or the tub. The wheels have a diameter less than the predetermined height, with the upper wheel bearing against the upper track and the lower wheel bearing against the lower track
Data Source
AI summary
In one aspect, a dishwasher includes a tub at least partially defining a treating chamber and defining an access opening, a dishrack, and a guide rail assembly slidably mounting the dishrack to the tub. The guide rail assembly has a guide rail mounted to the dishrack or to the tub and has upper and lower tracks, which are spaced from each other by a predetermined height, and at least one pair of wheels comprising upper and lower wheels, which are rotatably mounted to the other of the dishrack or the tub.