Backpack Power Supply Strap Force Angle and Weight Distribution
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Solution Overview
Problem
Conventional backpack power supply systems cause user fatigue due to increased weight and discomfort when carrying battery packs, limiting continuous working time for electric tools.
Innovation Solution
A backpack tool system with a detachable battery pack and a wearable device featuring a strap with a specific force direction and a center of gravity configuration that ensures comfort and balance, allowing for effortless carrying and easy posture changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the capacity of the battery pack is increased to extend working time, then the working time is prolonged, but the weight of the battery pack increases, causing user fatigue
Solution Approach 1:
The battery pack is designed as a detachable module that can be separated from the power supply apparatus. This allows the heavy battery to be removed and replaced when depleted, extending the overall working time without requiring the user to continuously carry maximum battery capacity. The segmentation enables flexible battery management where used batteries can be swapped with charged ones.
Solution Approach 2:
The system implements a battery replacement mechanism where depleted battery packs are discarded from the apparatus and recovered for recharging. This allows continuous operation by swapping batteries rather than carrying multiple full-capacity batteries simultaneously, effectively extending working time while managing weight through selective discarding and recovery of battery units.
2Ease of operation
If the battery pack is made detachable for easy replacement, then battery更换 is convenient, but the connection reliability may be reduced
Solution Approach 1:
The battery pack and power supply apparatus are divided into separable components with dedicated connection interfaces. This segmentation enables easy detachment and reattachment while the specialized connector design ensures reliable electrical contact during connected operation, resolving the contradiction between ease of replacement and connection reliability.
Solution Approach 2:
A specialized connector serves as an intermediary element between the battery pack and power supply apparatus. This intermediary component facilitates easy connection and disconnection through its mechanical design while maintaining reliable electrical contact through built-in contact structures, thus enabling both convenient replacement and stable operation.
3Stability of the object's composition
If the center of gravity is positioned to prevent the apparatus from falling backward, then stability is improved, but the wearable device may cause user fatigue
Solution Approach 1:
The back pad is designed with differentiated local qualities - a harder portion at the upper end for structural support and stability, and a softer portion at the lower end for comfort. This local quality variation allows the pad to provide the necessary support to prevent the apparatus from falling backward while minimizing pressure points and discomfort on the user's back, thereby reducing fatigue.
Solution Approach 2:
The back pad's physical parameters are optimized by varying its hardness distribution along its length. The upper portion has higher hardness to provide stable support for the apparatus weight and prevent backward falling, while the lower portion has lower hardness to conform to the user's back and reduce pressure discomfort, thus balancing stability requirements with fatigue reduction.
Data Source
AI summary
A backpack tool system and a backpack power supply apparatus for use with an electric tool. The backpack power supply apparatus includes a battery pack for providing electric energy, a body for carrying the battery pack, and a wearable device connected to the body and wearable by a user to carry the body. The battery pack is detachably connected to the body. The body defines a plane and a height extending in a heightwise direction. The body is at least partially symmetrical about the plane. The wearable device includes a strap, which includes an upper end connected to an upper portion of the body. The upper end of the strap applies a force to the body when the user wears the wearable device. An included angle between a projection of a direction of the force on the plane and the heightwise direction is greater than or equal to 30 degrees and less than or equal to 50 degrees.