Backpack Semi-Rigid Core Load Transfer
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Solution Overview
Problem
Conventional backpack systems encumber the shoulders and limit motion due to traditional shoulder straps, which can lead to fatigue and discomfort, especially when carrying heavy loads over long distances.
Innovation Solution
The Backpack System replaces conventional shoulder straps with a lightweight, semi-rigid core assembly that transfers the load forward toward the center of the body, using a covered semi-rigid core with Styrofoam padding and a two-part quick snap coupling system to form a stabilized cage, allowing for greater arm and shoulder mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional shoulder straps are used to carry heavy loads, then load-bearing capacity is improved, but shoulder fatigue and restricted motion occur
Solution Approach 1:
The patent removes the traditional shoulder strap component from the backpack system entirely. Instead of modifying shoulder straps, the invention extracts this element and replaces it with a hip belt and frame structure that transfers load to the hips, thereby eliminating the source of shoulder fatigue and restriction while maintaining load-bearing capacity
Solution Approach 2:
The patent introduces a hip belt as an intermediary load-bearing element between the backpack and the user's body. This hip belt acts as a mediator that transfers the weight from the shoulders to the hips, allowing the shoulders to remain free for motion while the hips承担 the load
2Force
If traditional shoulder straps are used to support heavy loads, then carrying capacity is improved, but comfort deteriorates due to encumbrance and fatigue
Solution Approach 1:
The patent removes the shoulder strap component that causes discomfort while preserving the load-bearing function through alternative means (frame and hip belt). This extraction eliminates the harmful effect of shoulder encumbrance while maintaining the ability to carry heavy loads
Solution Approach 2:
The patent employs a load-transfer mechanism that copies the function of shoulder straps (supporting the pack weight) but implements it through a different anatomical pathway (hips instead of shoulders). The hip belt replicates the load-bearing role without the negative side effects
3Force
If conventional shoulder straps are used, then load transfer to shoulders is improved, but arm and shoulder motion is restricted
Solution Approach 1:
By removing shoulder straps entirely, the patent eliminates the source of motion restriction while preserving load transfer efficiency through the hip belt and frame structure. The shoulders are extracted from the load-bearing role, freeing them for full range of motion
Solution Approach 2:
Instead of transferring load to the shoulders as in conventional designs, the patent inverts the approach by transferring load to the hips and lower body. This reversal of the load transfer pathway achieves both efficient load carrying and unrestricted upper body mobility
Data Source
AI summary
A backpack system or personal load bearing system uses a lightweight, SRC (semi-rigid core) and hanger suspension system, that compresses the center of the body between the xiphoid process and the lower back to a compressive force to transfer the load upward and forward while freeing up the shoulders. The SRC is provided that is made out of a semi-rigid plastic such as ABS plastic, carbon fiber composite or any other non-compressible material with similar structural characteristics. Left and right hooks pass over, forward and downward over the chest and are joined at a central coupling at a center of the human body, the “xiphoid process”, a small extension of the sternum. Right and left lower straps extend to left and right lower support sites to form a arched cage on the user. A belt wraps around the waist on top of the hip bones to limit lateral movement.