Offset Drive Axes for Electric Device Weight Balance
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Solution Overview
Problem
Existing electrically driven devices, such as shavers and toothbrushes, face challenges with bulky designs and uneven weight distribution due to centrally located motors and side-mounted batteries, leading to inefficient use of space and assembly alignment issues.
Innovation Solution
The design incorporates a chassis with parallel offset longitudinal axes for the electric motor, oscillating body, and battery unit, allowing for improved space utilization and weight distribution by positioning the motor and battery asymmetrically within the housing, with the oscillating body's axis perpendicular to the motor and battery axes, enabling efficient assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor and battery unit are arranged centrally or side-by-side in conventional configurations, then the drive mechanism remains simple, but the device becomes bulky with inefficient space utilization
Solution Approach 1:
The patent applies asymmetry by deliberately offsetting the longitudinal axes of the motor, battery unit, and oscillating body from a common central alignment. The second longitudinal axis of the oscillating body is positioned at a first offset distance from the first longitudinal axis of the motor, and the third longitudinal axis of the battery unit is positioned at a second offset distance from the first longitudinal axis. This asymmetric arrangement optimizes space utilization within the housing while maintaining structural integrity and functional efficiency.
2Volume of moving object
If the motor and battery are positioned to optimize space, then volume efficiency improves, but weight distribution and assembly alignment become uneven
Solution Approach 1:
The patent applies local quality by creating distinct spatial zones with different functional characteristics. The offset arrangement establishes specific local positions for the motor, battery unit, and oscillating body, where each component occupies an optimized local space while contributing to the overall balanced weight distribution. The first offset distance and second offset distance are specifically designed to achieve both compactness and stability.
3Ease of manufacture
If drive shafts are aligned in a common plane as in conventional swing bridges, then the conversion mechanism is straightforward, but unused space remains and weight distribution is uneven
Solution Approach 1:
The patent transitions from traditional two-dimensional planar alignment of drive shafts to a three-dimensional offset configuration. The longitudinal axes of the motor, battery unit, and oscillating body are arranged in parallel but at different offset distances, effectively utilizing the third dimension (lateral offset) to optimize space while maintaining functional relationships. This dimensional change eliminates unused space and improves weight distribution.
Data Source
AI summary
The invention relates to an electrically driven device, for example an electric hair removal device, such as a wet or dry shaver, an electric toothbrush or an electric skin treatment device. The electrically driven device comprises a housing having a chassis, wherein the chassis comprises an electric motor having a first drive shaft, a battery unit, and an oscillating body having a second drive shaft. A first longitudinal axis is defined arranged along the second drive shaft, a second longitudinal axis is defined arranged along the first drive shaft, and a third longitudinal axis is defined arranged through the center of the body of the battery unit, wherein the second longitudinal axis and/or the third longitudinal axis are parallel offset to the first longitudinal axis.