Foldable Box Hinge Shaft Cam Mechanism
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Solution Overview
Problem
Foldable boxes face challenges in achieving low stacking height, lightweight design, stability, ease of cleaning, and robustness while maintaining a smooth interior surface for transporting perishable items like fruit and vegetables, with existing hinge mechanisms failing to absorb large forces and being prone to incorrect operation.
Innovation Solution
A foldable box design featuring a special hinge arrangement with a shaft and cam mechanism that creates a non-positive connection between the exterior wall and floor only during up-folding, allowing for easy dismantling and increased stability, and a locking mechanism with a snap-in element for secure latching without high force requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a robust hinge mechanism is used to ensure stability and load-bearing capacity, then the box becomes more stable and can absorb higher forces, but the mechanism becomes more complex and harder to dismantle
Solution Approach 1:
The hinge mechanism is divided into separate functional elements: a shaft component that provides rotational movement and a cam component that provides locking action. This segmentation allows each element to be optimized for its specific function while simplifying the overall assembly and disassembly process compared to a monolithic robust hinge.
Solution Approach 2:
The hinge mechanism transitions from a static connection to a dynamic system where the cam profile converts rotational motion into linear motion to engage and disengage the locking action. This dynamic mechanism allows the hinge to be both robust during operation and easily dismantled when needed, resolving the contradiction between strength and complexity.
2Weight of moving object
If the box is designed to be lightweight with minimal material, then the weight is reduced and transport efficiency improves, but the stability and robustness during handling and transport deteriorate
Solution Approach 1:
The hinge mechanism uses elastic deformation of the cam and shaft components to provide both the lightweight structure and the necessary stability. The cam profile is designed to engage positively during transport to provide stability, while allowing easy disengagement when needed, thus maintaining box stability without requiring excessive material.
Solution Approach 2:
The hinge components are designed to utilize composite construction or multi-material approaches where rigid materials provide structural strength for stability while lighter materials reduce overall weight. This allows the box to maintain both lightweight design and adequate stability during handling and transport.
3Ease of operation
If the interior surface is made smooth and flat to prevent food rests, then cleaning ease improves and hygiene is maintained, but the structural stability and load-bearing capacity deteriorate
Solution Approach 1:
The box structure is segmented into the interior surface area and the hinge mechanism area. The interior surface can be made smooth and flat for easy cleaning, while the hinge mechanism incorporates additional structural elements to compensate for any strength reduction from the smooth surface design, thus resolving the contradiction between cleaning ease and structural strength.
4Reliability
If the locking mechanism requires high force to ensure secure latching, then the reliability of the locked state improves, but the ease of operation and risk of incorrect operation deteriorate
Solution Approach 1:
The locking mechanism uses a cam profile that converts a small input force during latching into a large locking force through mechanical advantage. The cam geometry is designed to provide progressive engagement, where the locking action builds up smoothly, ensuring reliable latching while requiring minimal operational force from the user, thus resolving the contradiction between reliability and ease of operation.
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 enables foldable boxes to maintain stability and absorb high forces, prevent automatic folding, and facilitate easy cleaning, while ensuring robustness and efficient handling without wear and tear, even under incorrect operation.
Implementation Method 1
a cam (52) arranged in the base area of the exterior wall (6b) and having a cam contour, which is implemented such that the cam contour, when erecting the exterior wall (6b), gets into contact with a contact surface (76) such that the shaft (50) is moved inwards in the lateral opening section (54b)
Data Source
AI summary
A foldable box includes a floor having a fixed exterior wall extending from the floor in a vertical direction upwards and an exterior wall having a shaft arranged in the base area of the exterior wall. The foldable box further includes a guide opening in the fixed exterior wall area in which the shaft is arranged, the guide opening including an opening section extending basically in the vertical direction through which the shaft may be guided out from the top, and a lateral opening section extending in a lateral direction from an outside of the fixed exterior wall area inwards, in which the shaft may be shifted basically in a lateral direction. A cam arranged in the base area of the exterior wall has a cam contour which is implemented such that the cam contour, when erecting the exterior wall, gets into contact with a contact surface arranged at the fixed exterior wall area such that the shaft is moved inwards in the lateral opening section.