Dishwasher rack lift system
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Solution Overview
Problem
Typical dishwasher racks are difficult to adjust in height and may have pinch points and unexpected movement, making it challenging to extend or retract them safely and efficiently within the dishwasher tub.
Innovation Solution
A dishwasher rack system that includes a worm screw mechanism with threaded members and slides, allowing the rack to be positioned between a first and second height, enabling smooth vertical adjustment and movement between stowed and deployed positions, with a motor-driven gear mechanism for controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a multi-bar linkage is used to mechanically assist rack movement, then the rack can be swung out and up from the dishwasher tub, but pinch points are created and unexpected movement may occur
Solution Approach 1:
The patent replaces the traditional multi-bar mechanical linkage system with a worm screw and threaded member mechanism. The motor rotates the worm screw, which through thread engagement with the threaded member, provides controlled mechanical assistance for rack movement without creating pinch points or unexpected movement, as the threaded connection provides precise and predictable motion control.
2Adaptability or versatility
If the rack is made adjustable in height, then versatility is improved, but device complexity increases
Solution Approach 1:
The worm screw and threaded member mechanism serves multiple functions: it provides height adjustment, controls rack movement, and prevents unintended motion through its self-locking特性. This single integrated mechanism achieves height adjustability without requiring multiple separate components, thereby maintaining simplicity while providing versatility.
3Measurement precision
If a motor-driven worm screw mechanism is used, then precise control over rack height is achieved, but device complexity increases
Solution Approach 1:
The worm screw mechanism inherently provides precise control through its thread pitch, which converts rotational motion into precise linear displacement. The system is self-regulating as the threaded member engages with the worm screw threads, providing controlled height adjustment without requiring complex control systems or additional components to maintain precision.
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 system provides safe and efficient vertical adjustment of the dishwasher rack, reducing the risk of pinch points and unexpected movement, enhancing user safety and convenience by allowing precise control over the rack's height and position.
Implementation Method 1
at least one worm screw located within the wash cavity and operably coupled to at least one motor
Implementation Method 2
at least one threaded member and at least one dishwasher rack may be connected to at least one worm screw
Implementation Method 3
one or more slides coupling at least one dishwasher rack to at least one threaded member
Data Source
AI summary
A dishwasher rack for a dish washing appliance. The dishwasher rack may be positionable between a variety of height positions. A drive mechanism may assist the dishwasher rack between the vertical positions. A worm screw may be coupled to a motor and may be positioned within the dishwasher tub.