Backpack Support Rod Structure for Vertical Load Alignment
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Solution Overview
Problem
Conventional backpacks increase physical burden and exertion due to the generation of a force couple between the backpack weight and the user's shoulders, necessitating additional balancing forces that affect spinal health and reduce mobility.
Innovation Solution
A backpack structure featuring an inverted U-shaped supporting rod above the backpack body, connected by elastic belts and shoulder straps, ensuring the weight and applied force align vertically, and providing cushioning through elastic elements to balance relative movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the backpack body is placed away from the user's back with shoulder straps on upper and lower sides, then the backpack structure is simple and easy to manufacture, but the applied force and gravity do not align vertically causing force couple generation that increases physical burden
Solution Approach 1:
The patent introduces a vertical dimension element (inverted U-shaped supporting rod) that extends upward from the backpack body. This structural addition changes the force transmission path from a horizontal/planar arrangement to a three-dimensional configuration, enabling the shoulder straps to connect to a point directly above the backpack's center of gravity, thereby aligning the applied force vertically with the gravitational force and eliminating the harmful force couple.
2Device complexity
If the entire weight of the backpack body is shared through the two shoulder straps, then the backpack structure is simple, but extra force must be applied to balance relative movements caused by body displacement during walking
Solution Approach 1:
The inverted U-shaped supporting rod acts as an intermediary structural element between the backpack body and the shoulder straps. It provides a stable connection point that remains vertically aligned with the backpack's center of gravity even during body movements. The elastic connecting belts further serve as intermediaries that flexibly accommodate relative movements between the user's body and the backpack, reducing the extra force needed to balance displacements during walking.
Solution Approach 2:
The patent incorporates elastic connecting belts that allow dynamic adjustment and flexibility in the connection between the supporting rod and the backpack body. This dynamic element enables the system to adapt to relative movements during walking, automatically balancing the forces without requiring additional active effort from the user, thus reducing physical exertion while maintaining structural integrity.
3Adaptability or versatility
If conventional shoulder straps are used without vertical alignment, then the backpack can be carried by hand or on shoulders, but the force couple generated negatively affects spinal health and reduces mobility range
Solution Approach 1:
By adding the inverted U-shaped supporting rod that extends vertically upward, the patent transforms the traditional planar backpack structure into a three-dimensional configuration. This dimensional change positions the shoulder strap attachment point directly above the backpack body's center of gravity, ensuring vertical alignment of forces regardless of whether the backpack is carried by hand or on shoulders, thereby eliminating the harmful force couple that previously affected spinal health and mobility.
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
Reduces physical effort and health impacts by maintaining vertical alignment of forces, offering cushioning and reducing fatigue during movement.
Implementation Method 1
two elastic connecting belts (23)... providing cushioning for a user during walking and moving, so that relative movements between the user's body and the backpack can be balanced with each other
Data Source
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AI summary
The invention discloses a backpack structure (2), which comprises a backpack body (21), an inverted U-shaped supporting rod (22), two elastic connecting belts (23) and two shoulder straps (24). The inverted U-shaped supporting rod (22) is located directly above the backpack body (21), has free ends (221) at two ends, and a plurality of positioning grooves (222) are disposed on the inverted U-shaped supporting rod (22); one end of each of the elastic connecting belts (23) is connected to the free end of the inverted U-shaped supporting rod (22), and another end is connected to the backpack body (21); and the shoulder straps (24) are correspondingly disposed on a back side (212) of the backpack body (21) on the left and right, one end of each of the shoulder straps (24) is connected to the positioning groove of the inverted U-shaped supporting rod (22), and another end is movably connected to a lower side or a side of the backpack body (21).