Nestable Metal Drum With Segmented Protrusions
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Solution Overview
Problem
Frusto-conical metal containers with outwardly pressed beads face distortion and collapse when stacked due to uneven weight distribution, as the bead reduces the load-bearing capacity of the side wall, leading to potential failure and increased material and cost with thicker metal to address this.
Innovation Solution
A nestable container design featuring discrete protrusions around the perimeter of the side wall, with a shallow annular bead between the protrusions and the body curl, providing increased load-bearing capacity without the distortion issues of conventional annular beads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a continuous annular bead is pressed outward from the side wall to facilitate nesting separation, then nesting separation is improved, but the load-bearing capacity of the side wall is reduced causing distortion and collapse under stacked loads
Solution Approach 1:
The continuous annular bead is segmented into discrete protrusions spaced around the perimeter of the side wall. This segmentation maintains the nesting separation function while preserving more of the side wall's load-bearing capacity, as the gaps between protrusions allow stress distribution that would otherwise be interrupted by a continuous bead.
Solution Approach 2:
The bead feature is applied locally at discrete points rather than continuously around the entire circumference. The protrusions are positioned only where needed for nesting separation, leaving the majority of the side wall intact and capable of bearing load, thus optimizing both nesting functionality and structural strength.
2Strength
If the thickness of the sheet metal is increased to make the container stronger, then the load-bearing capacity is improved, but the weight and cost of the container increase
Solution Approach 1:
By segmenting the bead into discrete protrusions, the side wall maintains greater structural integrity and load-bearing capacity with the same metal thickness. This allows the use of thinner sheet metal (0.5mm or more) while still achieving the required strength, thereby reducing weight and material cost.
3Stability of the object's composition
If the height of the wall above the bead is increased to prevent distortion, then the stability is improved, but the nesting capability and separation ease are reduced
Solution Approach 1:
The discrete protrusions are positioned to provide adequate spacing from the body curl, allowing sufficient wall height above the protrusions to maintain stability and resist distortion under load, while still enabling effective nesting separation through the localized protrusion features.
Data Source
Figure 1
Figure 2a~4
Figure 5
AI summary
A nestable container (1; 10) is provided having a stacking capability. Such a container (1: 10) may be fabricated from sheet metal and advantageously comprise a frusto-conical drum. The container (1; 10) has a side wall (2; 12) that is provided with a plurality of discrete protrusions (5; 11) spaced around a perimeter of its outer surface. The protrusions (5; 11) enable nested two containers to be separated easily without distortion but increase the load-bearing capability of the container when stacked. The protrusions (5; 11) may comprise dimples pressed outwardly from the side wall. In some embodiments the side wall (2; 12) may comprise an annular bead (13) that is located between lower edges (6; 14) of the protrusions (5: 11) and a body curl (3; 15) of the container (1; 10) and that is shallower than the protrusions (5; 11).