Travel Suitcase With Flank-Mounted Wheels for Rolling Comfort
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Solution Overview
Problem
Existing wheeled suitcases have swivel wheels that protrude under the luggage compartment, increasing the length dimension without providing additional storage space, and smaller wheels compromise rolling ability and comfort, especially on uneven surfaces.
Innovation Solution
The suitcase design features rolling wheels positioned on the flanks with a wheel cap that protects the wheels laterally and extends over part of the periphery, allowing larger wheel diameters without increasing the usable volume, using a unitary plastic wheel cap for protection and incorporating a compressible tyre for enhanced rolling comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If swivel wheels are mounted under the luggage compartment, then the suitcase can be rolled, but the length dimension increases without providing additional storage space
Solution Approach 1:
The patent relocates the wheels from a longitudinal arrangement (under the bottom) to a lateral arrangement (on the flanks). This dimensional change allows the wheels to be positioned in the width direction rather than consuming length, thereby maintaining rolling ability while preserving usable storage volume.
Solution Approach 2:
The wheel is nested within a wheel cap that is integrated into the flank structure. The wheel cap houses the wheel laterally within the suitcase body, allowing the wheel to be contained within the overall dimensions without protruding excessively, thus maintaining compact size while enabling rolling function.
2Volume of moving object
If smaller wheels are used to maintain compact dimensions, then the suitcase fits hand luggage restrictions, but rolling comfort and ability are compromised
Solution Approach 1:
By positioning wheels on the flanks rather than under the bottom, the patent enables larger wheel diameters without increasing the length dimension. The wheels can extend vertically and laterally within the flank space, allowing for larger wheel size while maintaining compact overall dimensions suitable for hand luggage.
Solution Approach 2:
The wheel cap provides localized protection and housing for the wheel on the flank, allowing the wheel to be larger in diameter while the overall suitcase dimensions remain controlled. The wheel cap structure enables the wheel to occupy space efficiently without compromising the compact exterior dimensions.
3Volume of moving object
If wheels are positioned on the flanks with large diameter, then usable volume increases, but the wheels need protection against lateral impact
Solution Approach 1:
The wheel is nested within the wheel cap structure that is integrated into the flank. The wheel cap acts as a protective housing that contains the wheel laterally, preventing direct exposure to external impacts while allowing the wheel to maintain its position for optimal rolling performance.
Solution Approach 2:
The wheel cap serves as an intermediary protective structure between the wheel and external lateral impacts. It absorbs and distributes lateral forces before they reach the wheel, protecting the wheel from direct impact while allowing the wheel to remain positioned for effective rolling.
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
This design maintains a high usable volume-to-outer dimension ratio, provides robust protection for the wheels, and enhances rolling comfort and silence, especially on uneven surfaces, while adhering to airline hand luggage size restrictions.
Implementation Method 1
a compressible tyre for enhanced rolling comfort
Data Source
AI summary
A travel suitcase comprises a luggage compartment (10) bounded by flanks (11,12) and having a rolling frame (20). Provided on a side remote from the frame is a handle (15) by which the luggage compartment can be moved along. The frame comprises on each of the flanks (11,12) a rolling wheel with a wheel axis which lies substantially transversely of the relevant flank and with a running surface which reaches beyond a bottom of the luggage compartment. The wheels are each connected to the relevant flank with interposing of a wheel cap (30). The wheel cap (30, 33, 35) extends over a part of a periphery around the wheel and provides between the wheels a fender (35) which at least largely shields the wheel laterally.