High-Density Handle Toothbrush Balance and Stability
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Solution Overview
Problem
Manual toothbrushes with lightweight handles tend to tip over when loaded with toothpaste, providing poor maneuverability and comfort during brushing, leading to inadequate plaque removal and difficulty in reaching all oral cavity areas.
Innovation Solution
A toothbrush design with a handle made from a higher-density material than the head, positioning the center of gravity closer to the handle, preventing tipping and enhancing balance, along with a magnetic handle for hygienic storage and improved thermal conductivity for faster drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lightweight materials like polypropylene are used for the handle, then manufacturing cost is reduced and ease of manufacture is improved, but the toothbrush tips over when loaded with toothpaste and maneuverability deteriorates
Solution Approach 1:
The patent changes the density parameter of the handle material from lightweight (polypropylene) to heavy-weight materials (metal, glass-filled plastic, or rubber) to shift the center of gravity toward the handle end, preventing tipping and improving maneuverability while maintaining ease of manufacture through injection molding or similar processes
2Ease of manufacture
If the center of gravity is positioned close to the head, then the handle can be made lighter and easier to manufacture, but the toothbrush becomes unstable and tips over when toothpaste is applied
Solution Approach 1:
The patent changes the density parameter of the handle material to heavy-weight materials, which shifts the center of gravity toward the handle end, providing stability and preventing tipping when toothpaste is applied to the brush head
Solution Approach 2:
The heavy handle material acts as a counterweight to balance the toothbrush, with the center of gravity positioned in the handle rather than near the head, preventing the brush from tipping over when loaded with toothpaste
3Strength
If thick handles are used to increase bending stiffness, then plaque removal efficiency is improved, but ease of rotating the brush in the hand deteriorates
Solution Approach 1:
The patent changes the material density parameter to heavy-weight materials, which provides sufficient bending stiffness and structural support without requiring an increased cross-sectional area, thus maintaining ease of rotating the brush in the hand
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The toothbrush remains stable when loaded, offering improved maneuverability, comfort, and hygiene, allowing for more effective brushing and reduced bacterial growth.
Implementation Method 1
the handle-material density is greater than the head-material density. The handle has a center of gravity positioned closer to the back side of the toothbrush than to the front side
Implementation Method 2
a magnetic handle for hygienic storage
Implementation Method 3
improved thermal conductivity for faster drying
Data Source
AI summary
A manual toothbrush, having a front side and a back side, includes a disposable head comprising a head material and a reusable handle comprising a handle material that is different from the head material. The head is to be repeatedly attached to and detached from the handle by being moved relative to the handle in a direction substantially parallel to a longitudinal axis. The head includes a head material having a head-material density, and the handle includes a handle material having a handle-material density, wherein the handle-material density is greater than the head-material density. The toothbrush is structured and configured so that when the toothbrush is placed on its back side on a substantially planar surface, the toothbrush remains on its back side in a balanced position—and when the toothbrush is thereafter moved out of said balanced position, the toothbrush automatically returns to the balanced position.