Collapsible Container Panel Assembly for Compact Stacking

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Solution Overview

Problem

Current collapsible containers are heavy, not watertight, difficult to fold/unfold, fragile, and inefficient in space-saving, making them unpopular with airline operators.

Innovation Solution

A collapsible container assembly with pivotable panels and integrated hinges that allow for a user-friendly, robust, and lightweight design with improved water resistance, featuring a smaller folded footprint and efficient stacking capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If collapsible containers are designed to be foldable for space saving, then storage volume is reduced, but the containers become heavy and fragile

Engineering Contradiction:
Improvestorage volumeVSAvoidcontainer weight
Core Design Contradiction:
Volume of moving objectVSWeight of moving object

Solution Approach 1:

The container is divided into multiple collapsible panels (front wall panel, rear wall panel, first lateral wall panel, second lateral wall panel) that can be folded independently. Each panel is segmented into sections that fold relative to one another, allowing the container to collapse into a compact form while using lightweight materials for each individual panel section.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The collapsible panels are designed to nest within each other during folding. The front and rear wall panels fold into the container body, while the lateral wall panels fold over each other in a nested arrangement, creating a compact folded state that minimizes volume without requiring heavy reinforcement structures.

Inventive Principle:
Principle #7Nested doll (Nesting)

2Volume of moving object

If collapsible containers are made foldable, then shipping space is reduced, but the containers become difficult to fold and unfold

Engineering Contradiction:
Improveshipping spaceVSAvoidfolding operation
Core Design Contradiction:
Volume of moving objectVSEase of operation

Solution Approach 1:

Multiple folding operations are combined into a single collapsing motion. When the container is collapsed, all panels (front, rear, and lateral walls) fold simultaneously through interconnected hinge relationships, transforming the container from its expanded state to its compact state in one unified action rather than requiring separate folding steps for each panel.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The container employs dynamic hinge connections that allow panels to pivot and rotate during folding. The hinges are positioned and configured to enable smooth angular transitions of each panel during the collapsing process, making the folding operation fluid and easy to perform without binding or resistance.

Inventive Principle:
Principle #15Dynamics

3Device complexity

If collapsible containers use simple folding mechanisms, then device complexity is reduced, but water tightness is compromised

Engineering Contradiction:
Improvefolding mechanism complexityVSAvoidwater tightness
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The container uses flexible sealing elements and gaskets that conform to the folding panels. These thin film-like sealing components are integrated into the panel edges and hinge connections, maintaining water tightness through their flexibility rather than rigid complex mechanisms, thus keeping the overall design simple while ensuring reliability.

Inventive Principle:
Principle #30Flexible shells and thin films

Solution Approach 2:

The container panels are constructed using composite materials that combine structural integrity with sealing capabilities. The panels incorporate integrated sealing layers or coatings that work with the simple folding mechanism to maintain water tightness, eliminating the need for complex separate sealing systems.

Inventive Principle:
Principle #40Composite materials

4Area of stationary object

If collapsible containers are designed for compact folding, then folded footprint is reduced, but stacking efficiency is compromised

Engineering Contradiction:
Improvefolded footprintVSAvoidstacking efficiency
Core Design Contradiction:
Area of stationary objectVSProductivity

Solution Approach 1:

The container is designed with an asymmetric collapsed configuration where the panels fold in different orientations and positions. The front and rear walls fold into the body while lateral walls fold over each other at different angles, creating an asymmetric compact form that optimizes both footprint reduction and stacking geometry for efficient vertical arrangement.

Inventive Principle:
Principle #4Asymmetry

Solution Approach 2:

The folding mechanism utilizes three-dimensional spatial rearrangement of panels rather than simple two-dimensional folding. The panels collapse in multiple dimensions, with some folding horizontally, others vertically, and some diagonally, creating a compact multi-dimensional configuration that minimizes footprint while maintaining stable stacking characteristics.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

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 design provides a better return ratio, improved footprint, stackability, reduced weight, and enhanced water tightness, ensuring stability and ease of operation during shipping.

Implementation Method 1

The pivotable connection between the outboard wall and the base comprises a bottom hinge assembly that includes a hinge rod that defines a hinge rod axis. The outboard wall is pivotable between a use position, a stowed position and an assembly position.

Methodology Applied
Scientific EffectHinge: Hinge

Implementation Method 2

In the assembly position the outboard wall is slidable in a direction that is parallel with the hinge rod axis. When the outboard wall is in the assembly position the channels defined in the plurality of knuckle members are aligned with the second extension members, such that the second extension members can be received in and slid along the channels

Methodology Applied
Scientific EffectSliding:

Data Source

PatentEP4021824B1Collapsible container assembly, method of collapsing a container assembly
Publication Date: 2025.11.26 SAFRAN CABIN CARGO BV
  • EP4021824B1 patent drawingFigure 1~2
  • EP4021824B1 patent drawingFigure 3~4
  • EP4021824B1 patent drawingFigure 5~6

AI summary

A collapsible container assembly that includes a first lateral side wall having a door frame and a first shear wall, a second lateral side wall that opposes the first lateral side wall and includes a wall panel and a second shear wall, an outboard wall that includes upper and lower panels that are pivotably connected to one another, an inboard wall that opposes the outboard wall and includes upper and lower panels that are pivotably connected to one another, a base and a top. The first shear wall is pivotable between a use position where the first shear wall is not positioned in the door frame interior and a stowed position where the first shear wall is positioned in the door frame interior. The second shear wall is pivotable between a use position where the second shear wall is not positioned in the wall panel interior and a stowed position where the second shear wall is positioned in the wall panel interior. The door frame, wall panel, inboard wall and outboard wall are pivotably connected to the base, and the inboard wall and outboard wall are pivotably connected to the top.