Crossing, Non-Fixed Shoulder Straps for Backpack Base-Lift Support
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Solution Overview
Problem
Traditional backpacks require the user's body to adjust to load transfer and movements, offering limited customizability and compromising on comfort and stability.
Innovation Solution
A backpack design with non-fixed shoulder straps crossing at the top and fixed connections at the bottom, combined with a hipbelt attachment system using pin connections, provides improved stability and customizability by lifting the load from the pack's base, reducing body forces and allowing for easy frame removal and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional backpacks use fixed rigid frame structures with standard strap configurations, then structural strength and load-bearing capacity are maintained, but user comfort and stability deteriorate because the user's body must adjust to load transfer and movements
Solution Approach 1:
The shoulder straps are configured to cross at the top and attach to the bottom corners, creating a dynamic load path that allows the pack to self-adjust and stabilize during movement. The hipbelt uses pin connections that permit rotational motion while maintaining load transfer, enabling the system to adapt to user body movements rather than requiring the user to adjust to a fixed structure.
Solution Approach 2:
The frame structure is divided into separate, removable components including vertical frame stays and horizontal frame stays that can be independently attached and detached. This segmentation allows customization of frame materials and configurations while maintaining overall structural integrity for load-bearing.
2Adaptability or versatility
If traditional backpacks use fixed rigid frame structures, then structural stability is maintained, but customizability deteriorates
Solution Approach 1:
The frame is segmented into removable vertical and horizontal stays that can be independently configured. Users can remove and replace frame components with different materials or configurations while maintaining the overall stable structure through the remaining components and the innovative strap geometry.
Solution Approach 2:
The shoulder straps serve multiple functions: they provide structural support, enable load transfer, allow for customization through different attachment configurations, and maintain stability through their crossed geometry. The pin connections similarly provide both rotational freedom and structural attachment.
3Stress or pressure
If shoulder straps are fixed at the top portion of the back panel, then attachment strength is maintained, but load distribution deteriorates because forces are not effectively lifted from the pack base
Solution Approach 1:
Instead of fixing the shoulder straps at the top and having them attach upward, the straps are configured to attach at the bottom corners and cross upward to the top rings. This inverted configuration causes the straps to lift from the base of the pack, effectively distributing load to the user's shoulders and hips while maintaining strong attachment points at the bottom where the frame provides support.
Data Source
AI summary
A backpack includes right and left shoulder straps that each respectively follows a path starting with a fixed connection at a bottom corner of a back panel. A padded portion extends upwards and then proceeds through an upper ring on the same side of the backpack. The strap then extends back down while crossing over to another fixed connection to a bottom corner on the other side of the back panel. At the top ring, the strap is merely guided back down and is not fixed relative to the ring. Curved frame stays on the left, right and bottom of the back panel have concave shape toward the user. A hipbelt attaches to the backpack with pin connections to allow rotational motion therebetween while preventing lateral motion. Outside straps reduce strain on the backpack fabric and side pockets are passthrough for insertion of objects therebetween while still allowing pocket usage.