Stackable Plastic Container Sidewall Projection Stacking
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Solution Overview
Problem
Existing plastic containers with double bottoms for heavy goods storage and transport struggle to achieve stable and even stacking, often resulting in tilted or uneven arrangements due to welding beads and uneven surfaces.
Innovation Solution
A plastic container design featuring projections on the sidewalls that extend beyond the welded joints to the second bottom, ensuring secure and flush stacking by resting on the rim of the lower container, while concealing welding beads and preventing contact with them, thus ensuring straight and stable stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If containers are stacked by placing rims upon rims, then stacking is enabled, but welding beads and uneven surfaces cause tilted and uneven stacking
Solution Approach 1:
The projection acts as an intermediary element between the rim and the container body. It provides a precise horizontal reference surface (end face) that mediates the stacking interface, ensuring that containers stack flush and stable even when the underlying surface (rim or welded joints) is uneven. The projection's end face at a predefined distance from the sidewall creates a new reference plane that eliminates the effect of surface irregularities.
2Strength
If welding is used to attach the second bottom to the first bottom, then structural strength is improved, but welding beads create uneven surfaces that prevent stable stacking
Solution Approach 1:
The invention extracts the problematic welding beads from the stacking reference surface by positioning the projection's end face at a predefined distance from the sidewall, beyond the welded joints. This separates the structural joining function (welding) from the stacking reference function (projection end face), allowing welding beads to remain for structural purposes while not interfering with stacking uniformity.
3Manufacturing precision
If the projection extends beyond the welded joints, then stacking precision is improved, but the projection structure becomes more complex
Solution Approach 1:
The projection is segmented into functional zones: the vertical portion extending from the sidewall provides structural support and positioning, while the horizontal end face at a predefined distance provides the precise stacking reference surface. This segmentation allows each portion to fulfill its specific function independently, achieving high stacking precision without excessive overall complexity.
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 enables precise and stable stacking of containers regardless of second bottom configuration, avoiding costly refinishing and ensuring even weight distribution, particularly under heavy loads, and facilitating smooth conveyor belt transitions.
Implementation Method 1
the ribs of the second bottom being welded to the planar bottom plate of the first bottom
Data Source
AI summary
A container for storage and transport of goods includes four sidewalls which surround a first planar bottom and have on their upper end a rim. A second bottom with a multiplicity of bottom ribs is connected to the first bottom by welding the bottom ribs of the second bottom with the first bottom. At least two opposite sidewalls of the container have each a projection which extends away from a sidewall and at a predetermined distance from the sidewall extends parallel to the sidewall in the direction of the bottom of the container. The projection has a horizontal end face which extends parallel to the area of the upper rim of the sidewall, with the horizontal end face extending at a level underneath the bottom plate of the first bottom.