Dishwasher Soft-Open Door Mechanism for Bounce-Free Opening
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Solution Overview
Problem
Conventional dishwasher door opening mechanisms require varying forces and can lead to hard bounces or damage due to differences in door weight and center of gravity, especially when loaded with liquids, resulting in suboptimal opening parameters and user inattention.
Innovation Solution
A soft open door mechanism featuring a tension spring and damping device that slows door motion as it approaches the horizontal position, providing a controlled and gentle opening action to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-loaded mechanism is used to assist door closing, then the door can be held closed and reclosed automatically, but the door requires varying force to open depending on position and load
Solution Approach 1:
The patent applies a progressive damping mechanism that activates at different stages of door opening. The first damper provides initial resistance during early opening, while the second damper activates near the end of travel to control the door's approach to the fully open position. This dynamic, multi-stage damping system adapts to the door's motion throughout its range, providing consistent control regardless of load variations or position.
2Ease of operation
If the door is allowed to move freely under gravity, then opening is easier, but the door accelerates and bounces hard against stops causing damage
Solution Approach 1:
The patent implements damping devices that provide resistance before the door reaches its fully open position. The second damper, positioned to engage near the end of the door's travel, provides cushioning that prevents the door from accelerating uncontrollably and bouncing against the stop. This beforehand cushioning protects the door and surrounding structures from damage while still allowing smooth opening.
3Object-affected harmful factors
If damping is applied throughout the entire door opening range, then door motion is controlled, but the door opening requires excessive force from the user
Solution Approach 1:
The patent divides the door opening motion into distinct segments, each handled by a different damping device. The first damper operates during the initial phase of opening, providing controlled resistance. The second damper operates during the final phase near the fully open position. This segmentation allows each damper to provide appropriate control for its specific phase without requiring the user to overcome excessive resistance throughout the entire range of motion.
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 mechanism ensures a smooth and controlled door opening, reducing the risk of hard bounces and damage by activating the damping device only when necessary, thus enhancing user safety and appliance durability.
Implementation Method 1
A spring is mounted in the cabinet so as to oppose movement of the door toward the horizontal position
Implementation Method 2
A damping device is mounted within the cabinet activatable by an opening movement of the door toward the horizontal position to slow the door motion
Data Source
AI summary
A consumer appliance with a soft open door mechanism includes a cabinet having top and a bottom and defining an opening along a front side. A door has a top and a bottom and is attached by a hinge to the front side of the cabinet. The hinge is at a bottom of the door so that the door is movable between an upright position closing the opening and a substantially horizontal position opening the opening. A spring is mounted in the cabinet so as to oppose movement of the door toward the horizontal position. A damping device is mounted within the cabinet activatable by an opening movement of the door toward the horizontal position to slow the door motion. The damping device is not active until the door has moved a distance from the upright position toward the horizontal position. Again, various options and modifications are possible.