Rosin Spreader With Segmented Teeth and Bristles for Bow Hair

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Solution Overview

Problem

Existing rosin spreaders for stringed instrument bow hairs are ineffective in both removing excessive rosin and evenly distributing rosin particles, often damaging the bow hair in the process.

Innovation Solution

A rosin spreader with a body featuring parallel teeth and bristles, securely attached to the surface, which extends outwardly and upwardly from the body, allowing for the removal of excess rosin while distributing particles evenly across the bow hair.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If a toothbrush is used to wipe off rosin dust on the bow hair, then excessive rosin can be removed, but the bow hair can be damaged and rosin particles cannot be evenly distributed

Engineering Contradiction:

Improveexcessive rosin on bow hairVSAvoiddamage to bow hair

Core Design Contradiction:

Object-generated harmful factorsVSObject-affected harmful factors

Solution Approach 1:

The rosin spreader is segmented into three distinct functional zones: first teeth for removing large rosin clumps, bristles for distributing rosin particles, and second teeth for final smoothing. This segmentation allows each component to perform its specific function without damaging the bow hair, resolving the contradiction between effective rosin removal and hair protection

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the rosin spreader have different local qualities suited for different tasks: the first teeth are positioned and sized for removing excessive rosin, the bristles are positioned between the teeth for gentle distribution, and the second teeth provide final smoothing. This local differentiation enables effective rosin management while protecting the bow hair from damage

Inventive Principle:

Principle #3Local quality

2Object-generated harmful factors

If a toothbrush is used to remove rosin powder, then some rosin can be wiped off, but rosin particles cannot be evenly distributed on the bow hair

Engineering Contradiction:

Improveexcessive rosin powderVSAvoideven distribution of rosin particles

Core Design Contradiction:

Object-generated harmful factorsVSManufacturing precision

Solution Approach 1:

The device segments the rosin management process into three stages performed by different components: first teeth for removal of excessive rosin, bristles for even distribution of particles, and second teeth for final smoothing. This segmentation ensures both effective rosin removal and uniform distribution, resolving the contradiction

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a single tool that only removes rosin, the invention inverts the approach by incorporating elements that not only remove excessive rosin but also actively distribute and smooth it. The bristles positioned between the teeth work to distribute rosin particles evenly, while the second teeth provide final smoothing, achieving both removal and even distribution simultaneously

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS11376625B2Rosin spreader

Publication Date: 2022.07.05 BAHNG SANG WOOK PETER

AI summary

The present invention is a rosin spreader that includes a body, a plurality of substantially parallel, spaced apart, elongated first teeth, a plurality of bristles, and an elongated first sidewall. The body has a top surface, a bottom surface, and a peripheral edge. The first teeth extend outwardly from the top surface of the body. The bristles extend outwardly from the top surface of the body. The first sidewall extends upwardly from the top surface of the body. The first teeth, the bristles, and the first sidewall are secured to the top surface of the body.