Multi-Mode Luggage Sub-Frame for Upright and Tilt Stability
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Solution Overview
Problem
Existing dual-mode luggage bags require complex structures with additional wheels and struts that compromise carrying space and functionality, limiting their use to either child-carrying or upright configurations, and often necessitate expensive manufacturing.
Innovation Solution
A separate wheeled sub-frame that mounts on the luggage base, allowing for dual modes of operation by changing the center of gravity through geometric relationships and pivot axes, enabling smooth transitions between upright and tilt modes without intruding into the bag's volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional wheels and struts are integrated into the bag frame for dual-mode functionality, then the bag can operate in both upright and child-carrying modes, but the carrying space inside the bag is compromised and the device complexity increases
Solution Approach 1:
The invention separates the child-carrying support structure from the main bag frame by using an external A-frame assembly that attaches to the bag exterior. This segmentation allows the bag to maintain its full internal carrying space while the A-frame provides the necessary support structure for child-carrying mode without intruding into the bag cavity.
Solution Approach 2:
The A-frame assembly acts as an intermediary structure between the bag and the child seat. It provides the necessary structural support and wheel mounting while keeping the bag frame simple and unobtrusive. The A-frame connects to the bag at specific attachment points and provides the mechanical advantage needed for stable child-carrying operation.
2Adaptability or versatility
If additional wheels and struts are integrated into the bag frame for dual-mode functionality, then the bag can operate in both upright and child-carrying modes, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention divides the system into separate functional modules: the bag itself, the A-frame assembly, and the wheel system. This segmentation allows each component to be optimized independently and simplifies manufacturing and assembly. The A-frame assembly can be produced as a separate unit and attached to the bag, reducing overall device complexity.
Solution Approach 2:
The A-frame assembly serves multiple functions: it provides structural support for child-carrying mode, mounts the wheels, and attaches to the bag. This multi-functionality reduces the need for separate components and simplifies the overall device structure while enabling dual-mode operation.
3Adaptability or versatility
If the bag is reconfigured to carry a child or smaller suitcase on the portion between the bag top and extended handle height, then the bag can carry additional loads, but the centre of gravity shifts causing the bag to tip over or require more force to hold the handle
Solution Approach 1:
The A-frame assembly is designed with a geometry that positions the wheels and support structure to counterbalance the shifted center of gravity when a child or additional load is carried on the bag top. The A-frame extends downward and outward, creating a stable triangular support structure that prevents tipping and distributes the weight more evenly.
Solution Approach 2:
The A-frame assembly is pre-configured with the appropriate geometry and wheel placement to automatically compensate for center of gravity shifts when the bag is placed in child-carrying mode. The structure is designed in advance to provide the necessary stability without requiring active adjustment during use.
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 solution provides stable support in both modes, reduces complexity and cost, maintains carrying space, and allows for both pushing and pulling, overcoming the limitations of traditional dual-mode bags.
Implementation Method 1
The geometry of the relationship between the bag frame and sub-frame of the luggage apparatus urges the bag to tilt and return upright
Implementation Method 2
the sub-frame and bag frame geometry defined by three pivot axes, rotation about the three pivot axes moving the bag frame between the upright mode and tilt modes
Data Source
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AI summary
A luggage apparatus and method is described herein that introduce a separate wheeled sub-frame that mounts on the base of a luggage apparatus and which allows for dual mode use between an upright mode and a tilt mode. The geometry of the relationship between the bag frame and sub-frame of the luggage apparatus urges the bag to tilt and return upright. The luggage apparatus is securely supported about the sub-frame in both modes with a changing centre of gravity and can be pushed or pulled in either mode.