Toothbrush Handle Snap-Fit and Head Channel Design

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Solution Overview

Problem

Existing toothbrushes with removable brushing heads often have design flaws that allow bacterial accumulation and lack a mechanism for secure toothpaste delivery.

Innovation Solution

A toothbrush design featuring a handle with a snap-fit mechanism that prevents bacterial collection, combined with a detachable head containing a channel for toothpaste dispensing between the bristles, ensuring easy attachment and removal without internal corners or crevices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If a removable brushing head design is used, then the toothbrush can be disassembled for cleaning or replacement, but spaces are created where material and bacteria can collect

Engineering Contradiction:

Improvedetachable head for cleaning or replacementVSAvoidbacterial accumulation in crevices

Core Design Contradiction:

Ease of repairVSObject-affected harmful factors

Solution Approach 1:

The toothbrush is divided into separate components (handle and head) that can be detached from each other. The head can be removed from the handle by pushing it along the longitudinal axis, allowing the head to be cleaned or replaced while maintaining a clean interface between components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The interface between the handle and head is designed with curved surfaces that eliminate sharp corners and crevices. The handle end and head base feature rounded geometries that prevent bacterial accumulation by creating smooth, non-adhesive surfaces that are easy to clean and do not trap debris.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of operation

If a snap fit mechanism is used for attaching the head, then the connection is secure and easy to attach, but internal corners and ridges may form where bacteria can collect

Engineering Contradiction:

Improveeasy attachment and removalVSAvoidbacterial collection in internal corners

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The snap fit mechanism utilizes curved, rounded surfaces at the interface between the handle and head. The handle end and head base are designed with rounded geometries that eliminate sharp internal corners and ridges, creating a smooth transition that prevents bacterial accumulation while maintaining secure attachment through the snap fit action.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Adaptability or versatility

If the head is made detachable, then the toothbrush offers flexibility for cleaning or replacement, but no provision is made for securing and delivering toothpaste

Engineering Contradiction:

Improvedetachable head for cleaning or replacementVSAvoidno toothpaste delivery mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The toothpaste delivery function is integrated into the existing head structure by forming a channel within the head itself. This channel communicates with the external environment through an opening that allows toothpaste to be dispensed during the brushing action, combining multiple functions (brushing and toothpaste delivery) in a single component without adding complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7431530B1Toothbrush methods and apparatus

Publication Date: 2008.10.07 POWERS NED

AI summary

A toothbrush includes a handle that is sized and configured for grasping, and a head that is provided with bristles. The head may be removed from the handle and replaced. Toothpaste may be contained in the head and forced into the bristles. The handle and a number of heads may be provided in a kit. Each head is provided in a separate sealed housing that allows the head to be attached to the handle without requiring a person assembling the toothbrush to remove the head from the packaging or touch the head.