Bit Holder Tire Portion Deflects Milling Particles

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Solution Overview

Problem

Bit holder blocks in road milling, mining, and trenching equipment wear down prematurely due to damage from particles removed from the terra firma, leading to increased replacement costs and reduced operational efficiency.

Innovation Solution

A bit holder design with a radially extending tire portion and a cylindrical shank that fits snugly into a narrowed bit holder block, providing an interference fit to protect the block from damage and allowing closer bit tip orientation for smoother surface degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If bit holder blocks are made of steel, then the structure is simple and cost-effective, but the blocks wear down prematurely due to damage from particles removed from the terra firma

Engineering Contradiction:

Improveservice life of bit holder blockVSAvoiddamage from particles

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a bit holder as an intermediary component between the bit and the bit holder block. This bit holder absorbs the harmful impact from particles removed during road milling, protecting the steel bit holder block from premature damage while maintaining the simplicity and cost-effectiveness of the overall structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If bit assemblies are mounted in staggered positions with standard bit holder block dimensions, then material removal is effective, but the bit tip orientation cannot achieve optimal surface smoothing

Engineering Contradiction:

Improvesurface smoothnessVSAvoidbit holder block dimension

Core Design Contradiction:

Manufacturing precisionVSLength of stationary object

Solution Approach 1:

The patent modifies the bit holder block by narrowing its dimension in one direction (creating a narrowed portion) while maintaining other dimensions. This dimensional change allows bit assemblies to be mounted in closer staggered positions, optimizing the V-shaped or spiral configuration for smoother road milling without compromising material removal effectiveness.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Manufacturing precision

If the bit holder block is narrowed to allow closer bit tip orientation, then surface smoothing is improved, but the block becomes more susceptible to particle damage

Engineering Contradiction:

Improvebit tip alignmentVSAvoidparticle damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The bit holder serves as a protective intermediary that fits within the narrowed bit holder block. It absorbs the full brunt of particle impacts, allowing the block to be narrowed for optimal bit alignment without increasing susceptibility to particle damage. The bit holder essentially shields the narrowed block structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Duration of action of moving object

If tungsten carbide or diamond coatings are applied to bits and bit holders, then component lifespan is extended, but the bit holder block still wears prematurely due to particle damage

Engineering Contradiction:

Improvebit and bit holder lifespanVSAvoidbit holder block durability

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The bit holder acts as a sacrificial intermediary component that protects the bit holder block from particle damage. While coatings extend the lifespan of bits and bit holders, the bit holder specifically shields the block, allowing the block to maintain its steel construction without premature wear from particle impacts.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design extends the lifespan of bit holder blocks by deflecting particles away from the block, reducing premature wear and enabling closer bit tip alignment for improved surface smoothing.

Implementation Method 1

The design extends the lifespan of bit holder blocks by deflecting particles away from the block

Methodology Applied

Scientific EffectDeflection:

Implementation Method 2

A bit holder design with a radially extending tire portion and a cylindrical shank that fits snugly into a narrowed bit holder block, providing an interference fit to protect the block from damage

Methodology Applied

Scientific EffectInterference fit:

Data Source

PatentUS10633971B2Bit holder with enlarged tire portion and narrowed bit holder block

Publication Date: 2020.04.28 THE SOLLAMI COMPANY

AI summary

A bit assembly includes a base block and a bit holder having a forward body portion and a shank. The forward body portion includes an enlarged tire portion to deflect material and particles removed from the terra firma and protect the base block from damage. The base block includes a base and a shortened front end. The enlarged tire portion has dimensions that cover at least all of the shortened from end. The dimensions of the tire portion can also extend beyond the dimensions of the shortened front end.