External Twin Rod Mounting for Wheeled Suitcase Capacity
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Solution Overview
Problem
Conventional wheeled suitcases with internal twin rod assemblies reduce internal capacity, add weight, and compromise aesthetics due to protruding and heavy strengthening parts.
Innovation Solution
A wheeled suitcase design with a telescopic twin rod where the tubes are mounted externally along the edges, allowing a flat bottom and integration with the suitcase's contour, reducing volume loss and weight while maintaining functionality and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tubes are mounted inside the suitcase body, then the twin rod assembly is protected and structurally integrated, but the internal capacity is reduced and the bottom is not flat
Solution Approach 1:
The patent extracts the tubes from the internal space of the suitcase body and relocates them to the external edges. This extraction eliminates the volume occupied by the tubes inside the suitcase, thereby maximizing internal capacity while maintaining the structural function of the twin rod assembly.
Solution Approach 2:
The patent transitions the tube mounting from a two-dimensional internal surface mounting to a one-dimensional edge placement along the perimeter of the suitcase. This dimensional change allows the tubes to be positioned outside the main body without interfering with internal space.
2Strength
If strengthening and attaching parts are added to the internal tube assembly, then the structural strength is improved, but the aesthetic appearance is compromised and weight increases
Solution Approach 1:
By extracting the tubes and their strengthening parts from the internal configuration to an external edge mounting, the patent eliminates the need for additional attaching parts that would be required for internal mounting. This reduces both weight and aesthetic compromise while maintaining structural strength.
3Reliability
If the tubes are positioned inside the suitcase, then the assembly is protected from damage, but projecting parts appear on the body faces which is unsightly
Solution Approach 1:
The patent relocates the tubes from the internal two-dimensional plane to the external one-dimensional edge line. This positioning along the edges allows the tubes to conform to the contour of the suitcase faces, preventing unsightly projections while maintaining protection through proper edge integration.
4Volume of moving object
If the tubes are mounted externally along the edges, then the internal capacity is maintained and aesthetics are improved, but the tubes may be more vulnerable to damage
Solution Approach 1:
By positioning the tubes along the edges rather than inside the body, the patent allows the tubes to follow the contour of the suitcase faces. This edge positioning naturally protects the tubes while maintaining internal capacity, as the tubes are integrated into the structural perimeter rather than occupying internal space.
Data Source
AI summary
The wheeled suitcase comprises:a rigid or semi-rigid suitcase body (1), mounted on wheels (30), said body (1) comprising at least three rigid or semi-rigid lateral faces (5, 9) separated by two edges (13), anda telescopic twin rod (16) comprising two arms (17), a handle and two tubes, the arms (17) being connected to the handle (18) and slidingly mounted in both tubes (21),said suitcase being characterized in that the two tubes (21) are disposed along the two edges (13) outside the body (1) of said suitcase.