Stackable and nestable cookware having a stable configuration
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Solution Overview
Problem
Stackable cookware sets often rock or shift when moved due to attached handles and lack of stable nesting configurations, making them unstable during stacking and nesting.
Innovation Solution
Cookware items are designed with a series of increasing diameters or tapering walls, and equipped with external stops that contact the rim of lower items at specific points to provide stability, minimizing rocking and shifting by ensuring contact at exactly three or four co-planar points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cookware items are equipped with attached handles, then ease of operation is improved, but stability of stacking configuration deteriorates
Solution Approach 1:
The handle is segmented from the cookware body into a separate component that attaches to the rim. This allows the handle to be present for ease of operation while not interfering with the stacking stability, as the handle can be positioned clear of the nesting interface between cookware items.
Solution Approach 2:
The handle is positioned in a different spatial dimension (extending outward from the rim) rather than interfering with the vertical stacking dimension. This dimensional separation allows the handle to provide operational ease without compromising stacking stability.
2Productivity
If cookware items are designed to stack and nest, then productivity is improved, but stability of stacking configuration deteriorates
Solution Approach 1:
Cookware items are designed with nesting capability where smaller items fit inside larger items, improving storage efficiency and productivity. The rim geometry and stops are specifically designed to maintain stacking stability even in the nested configuration, preventing rocking and shifting.
Solution Approach 2:
The rim of each cookware item has localized geometric features (specific shapes and stop positions) that are optimized for stable nesting. This local quality enhancement at the nesting interface ensures stability is maintained specifically where items contact during stacking, without compromising overall nesting productivity.
3Stability of the object's composition
If stops are configured to contact rim at multiple points, then stability of stacking configuration is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The stops are designed with asymmetric contact point configurations (e.g., one stop contacting at two points, another at one point) rather than symmetric multi-point contact. This asymmetric design provides sufficient stability while being more tolerant of manufacturing variations, reducing precision requirements.
Solution Approach 2:
The design specifies exact numbers of contact points (three or four total per item) rather than requiring precise positioning of multiple contact points. This parameter-based approach (counting contact points) is more manufacturable than requiring precise geometric alignment, while still achieving stable stacking configuration.
Data Source
AI summary
A set of nestable and stackable cookware, for example, a set of pots and pans, is maintained in a stable configuration by stops attached to the outer walls of the cookware. Each stacked and nested item of cookware is supported on the rim of the lower item by two stops attached to its outer wall, on opposite sides of the item, so that the wall and base of the item is not contacting the lower item. Either or both of the stops include a handle extending outwardly from the stop.