Electric Toothbrush Simplified Drive System Reduces Assembly Costs
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Solution Overview
Problem
Existing dual-action electric toothbrushes have complex drive systems that increase manufacturing and assembly costs and can lead to durability issues, resulting in a short effective cleaning lifespan and user dissatisfaction due to misalignment and excessive vibrations.
Innovation Solution
A dual-action electric toothbrush with a replaceable brush head section featuring a simplified drive system that includes a shell portion, a translation head for rectilinear motion, and an oscillation head for rotary motion, reducing the number of moving parts and eliminating the need for multiple pin-swivel arm arrangements, thus lowering manufacturing costs and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex drive systems are used to achieve dual-action motion, then cleaning performance is improved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The brush head is divided into multiple independently movable brush units, each with its own drive mechanism. This segmentation allows each unit to perform specific motion patterns (reciprocating, rotating, oscillating) independently, achieving dual-action cleaning without requiring a single complex drive system for the entire brush head.
Solution Approach 2:
The brush units are designed with dynamic motion capabilities, allowing them to change their motion patterns based on operational requirements. Each brush unit can transition between different motion modes (reciprocating, rotating, oscillating) to adapt to different cleaning needs, providing versatility without increasing overall system complexity.
2Ease of operation
If multiple pin-swivel arm arrangements are used, then dual-action motion is achieved, but manufacturing cost and assembly time increase
Solution Approach 1:
Multiple brush units are integrated into a single brush head assembly that shares common structural elements and drive mechanisms. This merging approach reduces the total number of separate pin-swivel arm arrangements needed, thereby lowering manufacturing costs and assembly time while maintaining the dual-action motion capability across all brush units.
Solution Approach 2:
The drive system is designed with universal components that can serve multiple functions across different brush units. The same drive mechanism can control multiple brush units, and the brush head structure is designed to accommodate various motion patterns through a single integrated system, reducing the need for multiple specialized components.
3Ease of operation
If complex drive systems are used, then motion control is improved, but durability decreases due to more moving parts
Solution Approach 1:
By segmenting the brush head into multiple independent units, each with simplified drive mechanisms, the system achieves better durability. Each segment has fewer moving parts that can wear out, and the independence of each unit means that wear in one segment does not affect the others, maintaining overall system reliability while preserving motion control capabilities.
4Ease of repair
If brush head section is made replaceable, then maintenance cost is reduced, but assembly complexity increases
Solution Approach 1:
The toothbrush is divided into replaceable segments, with the brush head being a separate, interchangeable component. This segmentation allows users to replace only the worn brush head without replacing the entire toothbrush, reducing maintenance costs. The modular design simplifies assembly by allowing pre-assembly of the brush head section, which can then be easily attached to the handle.
Data Source
AI summary
An electric toothbrush with a replaceable brush head section is disclosed. The electric toothbrush includes a handle including a motor therein and a brush head section. The toothbrush has a longitudinal axis extending through the handle to the far end of the brush head. The brush head section includes a translation head and an oscillation head, each of which has a bristle support member, one of which will rotate and oscillate and the other of which will not rotate or oscillate, but will reciprocate along, or substantially parallel to, the longitudinal, axis. The translation head is adapted so that its motion will induce a different motion in the bristle head of the oscillation head. The invention results in reduced assembly costs.