Sander Battery Layout for Stable Balance and Low-Profile Height
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Solution Overview
Problem
Existing sanders face challenges in achieving a compact size and stable operation due to weight imbalance caused by large battery packs, which affect balance and battery life, and are limited in overall height reduction.
Innovation Solution
A sander design with a battery pack coupling portion, an electric motor with a rotatable shaft, and a base plate, where the center of gravity is between the battery pack and the output shaft, ensuring balanced weight distribution and a compact overall height of less than 105 mm, with a motor shaft angle between 0° and 25° relative to the base plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a relatively large battery pack is mounted to provide sufficient battery life, then the battery life is improved, but the weight distribution becomes unbalanced and the base plate cannot be stably placed on a horizontal plane
Solution Approach 1:
The patent repositions the battery pack from a conventional location to the rear side of the housing, changing its spatial dimension and orientation. This dimensional relocation allows the battery pack to contribute to balancing the weight distribution in the front-back direction, enabling stable placement on a horizontal plane while maintaining sufficient battery capacity
Solution Approach 2:
The patent employs asymmetric weight distribution by strategically placing the battery pack at the rear side of the housing, creating a balanced center of gravity that compensates for the weight of the motor and other components at the front. This asymmetric arrangement resolves the weight balance issue while maintaining adequate battery life
2Length of stationary object
If the overall height of the sander is reduced to achieve a compact form factor, then the portability is improved, but the internal arrangement becomes more limited and difficult to optimize
Solution Approach 1:
The patent adopts a low-profile design with overall height of 105 mm or less by redistributing components in the horizontal plane rather than stacking them vertically. The battery pack is positioned at the rear side, and the motor is arranged with its rotation axis extending in the vertical direction, optimizing the use of horizontal space to achieve compact height without excessive internal complexity
Solution Approach 2:
The patent applies local optimization by positioning the battery pack coupling portion at the rear side of the housing, creating a specialized region for power supply integration. This localized arrangement allows efficient space utilization and simplifies the overall internal structure while maintaining the compact height requirement
Data Source
AI summary
A sander includes a body and a battery pack, The body includes a housing, an electric motor, a base plate, and a battery pack coupling portion, where the battery pack is mountable to the battery pack coupling portion; the electric motor is disposed in the housing and has a rotatable motor shaft; laminations of the electric motor are located between the battery pack and an output shaft; and the angle γ between an axis of the motor shaft and a plane where the base plate is located is greater than or equal to 0° and less than or equal to 25°.