Mountain-Shaped Toothbrush Bristles for Light-Pressure Cleaning
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Solution Overview
Problem
Conventional toothbrushes with uniformly aligned brush hairs risk damaging gums due to excessive brushing pressure, and their handles often rotate during use, reducing brushing effectiveness and requiring frequent replacement.
Innovation Solution
A toothbrush design with a longitudinally extending handle featuring a grip portion with a triangular cross-section, a narrower neck portion, and a brush portion shaped like a mountain, allowing for precise control and light brushing pressure, along with detachable components for sustainability and customization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If brush hairs are uniformly aligned in a plane, then manufacturing is simple, but brush hairs cannot effectively enter gaps between teeth without excessive pressure
Solution Approach 1:
The brush portion is designed with a mountain shape that allows dynamic adaptation to tooth surfaces. The varying heights enable the brush to automatically adjust its configuration when applied to teeth, with shorter hairs making contact first and progressively longer hairs engaging as pressure is applied, creating a dynamic cleaning action rather than a static one.
Solution Approach 2:
Different regions of the brush portion have different hair heights tailored to specific cleaning needs. The mountain shape creates zones with varying brush hair lengths, where shorter hairs clean surface areas and longer hairs reach into deeper gaps and crevices, providing localized quality matching different anatomical features of teeth.
2Ease of operation
If handle has circular cross-section, then pen grip is easier, but handle rotates during brushing reducing precision
Solution Approach 1:
The handle cross-section transitions from a circular shape at the grip portion to a narrower, asymmetric shape at the neck portion. This asymmetric neck design prevents rotational movement while maintaining the ease of pen grip, as the non-circular cross-section naturally resists rotation when held between thumb and forefinger.
Solution Approach 2:
The handle is divided into functionally distinct segments: a grip portion optimized for comfortable holding and a neck portion optimized for preventing rotation. This segmentation allows each part to fulfill its specific function without compromise, with the neck acting as a transition zone between the circular grip and the brush assembly.
3Device complexity
If brush portion has uniform height, then structure is simple, but other brush hairs hit teeth sides preventing effective cleaning
Solution Approach 1:
The mountain-shaped brush portion creates a dynamic cleaning sequence where shorter hairs make initial contact and progressively longer hairs engage as the brush is pressed against teeth. This dynamic progression allows brush hairs to advance into gaps without lateral interference from uniformly heighted surrounding hairs.
Solution Approach 2:
The mountain shape creates a gradient of hair heights rather than uniform height, allowing partial engagement of different hair lengths during brushing. This gradual engagement prevents excessive lateral pressure on tooth surfaces while still enabling effective cleaning action.
4Reliability
If toothbrush is replaced frequently, then hygiene is maintained, but environmental waste increases and cost rises
Solution Approach 1:
The toothbrush is divided into replaceable segments: a durable handle that can be reused and a replaceable brush portion. This segmentation allows users to maintain hygiene by replacing only the brush hairs when worn, while retaining the handle for extended use, thereby reducing waste and long-term costs.
Solution Approach 2:
The design enables selective discarding of the consumable brush portion while recovering and reusing the durable handle. This approach follows the principle of discarding only what is necessary (worn brush hairs) and recovering valuable components (handle) for continued use.
Data Source
AI summary
To provide a toothbrush that can obtain a high cleaning effect even when teeth are brushed with light pressure. The toothbrush 2-1 has a longitudinally extending handle 4, a brush hair attaching portion 6 formed at the tip of the handle 4, and a brush portion 8 comprising multiple brush hair bundles that are brush hair in the brush hair attaching portion 6. The handle 4 comprises; a grip portion 10 that is held in the hand; a neck portion 12 that is positioned between the grip portion 10 and the brush hair attaching portion 6 and supports the brush hair attaching portion 6. A brush portion 8 is formed in a mountain shape with the center of the brush hair attaching portion 6 in the longitudinal direction of the handle 4 being formed as the top.