Dishwasher Lower Rack Lift Assembly for Smooth Ergonomic Raising
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Solution Overview
Problem
Existing dishwasher designs require users to bend over to load or unload dishes from the lower rack, leading to ergonomic issues, and existing rack lifting mechanisms are often complex, expensive, and difficult to maintain, failing to provide a smooth and uniform lifting experience.
Innovation Solution
A dishwasher with a lower rack assembly featuring a lift assembly that includes a first arm pivotally coupled to the rack, allowing movement along vertical and transverse directions, enabling smooth and uniform lifting of the rack through a combination of arm movement and slot interaction, facilitating ergonomic loading and unloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex lifting mechanism is used to lift the lower rack, then the rack can be lifted, but the system becomes complex, expensive, and difficult to maintain
Solution Approach 1:
The lift assembly uses a dynamic arm mechanism that rotates about a pivot point to convert vertical rack movement into rotational motion. The arm moves between slots in different brackets, creating a controlled mechanical linkage that provides smooth rack elevation without complex actuators or motors.
Solution Approach 2:
The lifting mechanism is passive and self-contained, using the rack's own movement to drive the arm rotation. The system automatically transitions between raised and lowered positions through the mechanical interaction of the arm with slots in the brackets, requiring no external power source or complex control systems.
2Ease of operation
If existing lifting mechanisms are used, then the rack can be lifted, but the lifting action is jerky and non-uniform
Solution Approach 1:
The rotating arm creates a continuous, smooth mechanical transition as it moves through its arc of motion. The rotational dynamics naturally distribute the lifting force evenly throughout the movement, eliminating jerky motions and providing uniform rack elevation.
Solution Approach 2:
The mechanism converts vertical linear motion into rotational motion in a different dimensional plane. By moving the arm through a circular arc rather than direct vertical translation, the system achieves smoother motion characteristics and more uniform force application.
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 provides a cost-effective, ergonomic method for lifting the lower rack in a smooth and uniform manner, reducing user discomfort and simplifying the loading and unloading process while maintaining ease of use and affordability.
Implementation Method 1
the first end of the first arm pivotally coupled to the lower rack, and a first bracket defining a first slot, the second end of the first arm movably coupled to the first slot. Movement of the lower rack along the vertical direction causes movement of the second end of the first arm relative to the first slot along the transverse direction and pivotal rotation of the first end of the first arm.
Data Source
AI summary
A lower rack assembly for a dishwasher appliance includes a lower rack configured for receipt of articles for washing, and a lift assembly connected to the lower rack. The lift assembly includes a first arm extending between a first end and a second end, the first end of the first arm pivotally coupled to the lower rack, and a first bracket defining a first slot, the second end of the first arm movably coupled to the first slot. Movement of the lower rack along the vertical direction causes movement of the second end of the first arm relative to the first slot along the transverse direction and pivotal rotation of the first end of the first arm.