Dishwasher Door Stiffener Assembly for Rigidity and Deflection Control
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Solution Overview
Problem
Conventional dishwasher door assemblies lack sufficient rigidity, leading to perceived weakness and instability due to the space between the inner and outer doors, which can result in deflection during operation.
Innovation Solution
A method of assembling a dishwasher door assembly by positioning a stiffener with a rib adjacent to a channel in the outer door's side flange, rotating it to insert the rib into the channel, and sliding it to contact the outer door's bottom flange, thereby securing the stiffener to enhance the door's rigidity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stiffener is added to the door assembly, then rigidity and stability are improved, but device complexity increases
Solution Approach 1:
The stiffener is integrated with the inner door panel through a unified construction approach where the stiffener becomes an inherent part of the door assembly structure. The stiffener is positioned within the hollow interior space and secured to the inner door panel, merging multiple functional elements (structural reinforcement and door panel) into a single integrated component system, thereby reducing overall device complexity while maintaining improved rigidity.
Solution Approach 2:
The stiffener utilizes the third dimension (depth) by being positioned within the hollow interior space of the door assembly, between the inner and outer door panels. This spatial arrangement allows the stiffener to provide structural reinforcement without adding to the external dimensions or visual complexity of the door assembly, effectively solving the rigidity-complexity contradiction through dimensional optimization.
2Stability of the object's composition
If the space between inner and outer doors is reduced, then deflection is reduced, but manufacturing difficulty increases
Solution Approach 1:
The door assembly is segmented into distinct functional zones: the inner door panel, the hollow interior space containing the stiffener, and the outer door panel. This segmentation allows each component to be manufactured and positioned independently, with the stiffener specifically placed within the hollow space to provide reinforcement. The segmented approach simplifies manufacturing by allowing separate production of components that are then assembled together, rather than requiring a monolithic structure.
Solution Approach 2:
The stiffener acts as an intermediary element positioned within the hollow interior space between the inner and outer door panels. This intermediary component provides structural reinforcement and reduces deflection without requiring the inner and outer doors to be in direct contact or tightly spaced. The stiffener mediates the structural relationship between the two panels, enabling stability improvement while maintaining ease of manufacture through independent component fabrication and assembly.
Data Source
AI summary
A method of assembling a stiffener to a dishwasher door assembly having an outer door and an inner door spaced from the outer door, the method comprising: positioning a rib from the stiffener adjacent a channel in a side flange of the outer door; rotating the stiffener to insert the rib into the channel; after positioning the rib into the channel, sliding the stiffener until a portion of the stiffener contacts a bottom flange of the outer door; and while the portion of the stiffener abuts the bottom flange, securing the stiffener to the outer door.