Crossed-Strap Bag Structure for Fast Shoulder-to-Backpack Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multi-purpose bags require frequent removal and reattachment of straps to change carrying modes, leading to inconvenience and potential detachment under external forces.
Innovation Solution
A multi-purpose bag design featuring crossed straps with adjustable lengths that can transition between shoulder and backpack states without detachment, using limiting passages and adjustable strap portions for seamless transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If straps are frequently removed and fastened to change carrying modes, then the bag can adapt to different carrying needs, but the operation becomes time-consuming and inconvenient
Solution Approach 1:
The strap system is designed to be dynamically adjustable through a simple pulling motion that transforms the strap configuration. The strap can transition between different states (shoulder bag, backpack, hand carry) by pulling the free end, making the adjustment process rapid and intuitive without requiring removal or reattachment of fasteners.
Solution Approach 2:
The strap is divided into functional segments including a fixed portion, an adjustable portion with limiting passages, and a free end. This segmentation allows the strap to be adjusted by manipulating only the free end, while the fixed portions remain in place, significantly reducing the time and complexity of mode changes.
2Adaptability or versatility
If straps are frequently removed and fastened to change carrying modes, then the bag can adapt to different carrying needs, but the frequent fastening causes inconvenience
Solution Approach 1:
The strap adjustment mechanism is self-servicing through a simple pulling action on the free end. The limiting passages automatically guide and constrain the strap during adjustment, eliminating the need for complex fastening operations or additional tools. The user simply pulls the free end to achieve the desired carrying mode.
3Reliability
If straps are fastened using conventional methods, then the bag can be securely carried, but the straps easily detach when subjected to external forces
Solution Approach 1:
The limiting passages act as intermediary elements between the strap and the bag body. These passages provide continuous contact and guidance for the strap, creating a reliable connection that resists detachment under external forces. The strap passes through these constrained passages rather than being attached through separate fasteners, enhancing security.
4Reliability
If conventional fastening methods are used for straps, then the bag can be carried securely, but the fastening process is complex and time-consuming
Solution Approach 1:
The invention extracts and eliminates the complex fastening and unfastening operations from the strap adjustment process. Instead of using separate fasteners that require manipulation, the strap integrates directly with the limiting passages through a simple pulling motion, significantly reducing operational complexity while maintaining security.
Data Source
AI summary
A multi-purpose bag includes a bag unit and two straps. The bag unit has a bag bottom, a front bag segment, a rear bag segment, and two limiting passages formed on the rear bag segment. The straps are crossed over each other. Each strap extends movably through a respective one of the limiting passages, and has an adjustment strap portion. Each strap is movable to transform between a shoulder bag state, where the adjustment strap portion of each strap has a first length, and the straps cooperate with the bag unit to define a shoulder space, and a backpack state, where the adjustment strap portion of each strap has a second length greater than the first length, and each strap cooperates with the bag unit to define a back hanging space.