Hard-Shell Suitcase Layout for Flat Packing and Stable Sitting
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Solution Overview
Problem
Existing suitcases, both for children and adults, face issues with uneven packing surfaces due to retractable handles stored in the base portion, lack of stability when sitting, and limited adaptability for different users' heights and towing directions.
Innovation Solution
A hard-shell suitcase design with retractable handles housed in the lid portion, featuring multiple wheel assemblies and feet for stable sitting, and a flexible handle for angled towing, allowing versatile use by both children and adults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the retractable handle is stored in the base portion of the suitcase, then the handle is accessible for towing, but the packing surface becomes uneven
Solution Approach 1:
The retractable handle is extracted from the base portion and relocated to the lid portion. This extraction removes the source of surface unevenness from the packing area while maintaining handle functionality. The lid portion's interior space is sufficient to accommodate the handle mechanism without compromising the flatness of the base portion's packing surface.
2Adaptability or versatility
If the suitcase is designed for children to sit on, then the lid portion provides a sitting surface, but the stability may be compromised
Solution Approach 1:
The suitcase employs asymmetric weight distribution and structural design where the base portion is optimized for stability with a wide support footprint, while the lid portion is designed as a separate, removable sitting surface. This asymmetry allows the sitting function to be added without compromising the base stability, as the lid can be removed if stability is needed.
Solution Approach 2:
The suitcase is segmented into a stable base portion and a separate lid portion that can function as a sitting surface. This segmentation allows the sitting capability to be added as an optional feature without permanently affecting the base structure's stability. The hinge connection enables the lid to be positioned for sitting or removed entirely if stability is required.
3Device complexity
If the retractable handle is stored in the base portion, then the handle is integrated, but the space for packing is reduced
Solution Approach 1:
The retractable handle is extracted from the base portion and placed in the lid portion. This relocation removes the handle from the packing space constraint, maximizing the volume available for luggage storage in the base portion while maintaining handle integration through the lid's interior space.
Data Source
AI summary
A hard-shell suitcase comprising a base portion and a lid portion connected to the base portion by a hinge. In the closed position an edge of the lid portion is adjacent to the edge of the first concave shell in the first plane. The hard-shell suitcase further comprises first, second, third and fourth wheel assemblies attached to the exterior of the base portion in a second plane parallel to the first plane. Each wheel assembly is configured to rotate about a first axis parallel to the second plane and about a second axis perpendicular to the first axis. The hard-shell suitcase further comprises a retractable handle configured to be movable in a direction parallel to the first plane from a retracted position to an extended position and from the extended position to the retracted position. In the retracted position a portion of the retractable handle is housed inside the lid portion.