Hybrid Collapsible Crate Base Design for Stacking Deflection
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Solution Overview
Problem
Collapsible crates experience excessive deflection when stacked with heavy items, leading to potential damage to packaging due to smooth lower surfaces on the base, which lack sufficient reinforcement, particularly in the center region.
Innovation Solution
The base is designed with a higher concentration of ribs in the center region to increase stiffness and a smooth, flat surface to prevent damage to packaging, while other regions have alternating ribs to enhance overall stiffness and protect lower crates from contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the base has smooth flat surfaces on the lower surface to protect packaging, then packaging damage is prevented, but the base lacks sufficient reinforcement and experiences excessive deflection when stacked with heavy items
Solution Approach 1:
The base is designed with different surface characteristics in different regions: the center region has a smooth flat lower surface to protect packaging, while the peripheral regions have ribs projecting downward to provide reinforcement and stiffness. This local differentiation resolves the contradiction by applying smooth surfaces only where needed for packaging protection while maintaining structural strength through strategic rib placement in load-bearing areas.
2Strength
If ribs are added to the lower surface of the base to increase stiffness, then deflection is reduced, but the ribs may contact and damage bags or packaging in the lower crate
Solution Approach 1:
Ribs projecting downward are placed only in peripheral regions of the base where they provide structural reinforcement without interfering with packaging in lower crates. The center region maintains a clear smooth surface that deflects downward under load without contacting packaging. This spatial separation resolves the contradiction between needing ribs for stiffness and avoiding packaging damage.
Solution Approach 2:
The base geometry is designed in advance to anticipate the downward deflection that occurs when heavy items are stacked. The smooth center region is positioned and shaped to follow the deflection path without contacting packaging, while peripheral ribs are positioned to provide stiffness without over-deflecting. This preliminary design prevents the harmful contact before it can occur.
3Object-affected harmful factors
If the center region of the base is made smooth and flat to prevent packaging damage, then packaging protection is improved, but the overall stiffness of the base is reduced
Solution Approach 1:
The base transitions from a uniformly smooth design to a differentiated design where the center region is smooth for packaging protection and peripheral regions contain reinforcing ribs. This local quality differentiation allows the center to protect packaging while the periphery provides the stiffness needed for overall structural integrity.
Solution Approach 2:
The solution moves from considering only the horizontal surface characteristics to incorporating vertical dimension considerations. The ribs are positioned at specific heights and locations to create a three-dimensional structure that provides stiffness through vertical reinforcement while maintaining a smooth horizontal contact surface in the center region.
Data Source
AI summary
A container includes a base having end edges and side edges. The base includes a plurality of regions including a center region, corner portions, side regions between the corner portions and between the center portion and the side edges, and end regions between the corner portions and between the center portion and the end edges. The center region is reinforced differently from the side regions, end regions, and corner regions. The corner regions are reinforced differently from the side regions and the end regions. The center region has no ribs protruding downwardly. A plurality of walls extending upward from the side edges and the end edges of the base.