Electric Toothbrush Stem Joint for Indicator Visibility
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Solution Overview
Problem
Existing electric toothbrushes face high tension between the grip and brush portions, making it difficult for users to view indicators, especially when brushing the inside surfaces of teeth, and the angled connection can lead to stress concentration at the joint.
Innovation Solution
An electric toothbrush design featuring a stem joint arrangement with an upper and lower cylinder portion inclined at a predetermined angle, incorporating a screw groove and engage member system for a secure connection between the grip and brush portions, along with a rubber stem packing and cover for enhanced stability and visibility of indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the brush portion is angled or inclined with respect to the grip portion, then the user can view the indicator, but the tension or stress at the joint between the grip portion and brush portion becomes relatively high
Solution Approach 1:
The stem joint is divided into an upper cylinder portion and a lower cylinder portion that are inclined relative to each other. This segmentation allows the connection to accommodate the angled configuration while distributing mechanical stress across multiple engagement points (screw grooves and engage members), thereby maintaining joint strength despite the inclined orientation.
2Device complexity
If the indicator is provided on only one side of the electric toothbrush, then the device structure is simple, but the user can view the indicator only when the electric toothbrush is held at a certain angle
Solution Approach 1:
The indicator is positioned on the brush portion rather than the grip portion, and the brush portion is inclined at a predetermined angle relative to the grip portion. This spatial reconfiguration in a different dimension allows the indicator to be visible from multiple angles, enabling users to view it regardless of how they hold the toothbrush.
3Stability of the object's composition
If a rigid connection is used between the grip portion and brush portion, then the connection is stable, but the tension or stress applied during brushing can still cause separation
Solution Approach 1:
The stem joint combines multiple connection mechanisms: screw grooves for threaded engagement and engage members for additional mechanical interlocking. This merging of multiple fastening methods creates a rigid connection that is highly resistant to separation under tension or stress applied during brushing.
Data Source
AI summary
An electric toothbrush includes a grip portion, a brush portion, and a joint arrangement for connecting the two portions. The joint arrangement has an upper cylinder portion and a lower cylinder portion, with an axis of the upper cylinder portion being inclined a predetermined angle with respect to an axis of the lower cylinder portion. The grip portion is connected to the lower cylinder portion and the brush portion is connected to the upper cylinder portion, so that the grip portion and the brush portion are inclined by the predetermined angle.