Electrically powered stripping tool

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Solution Overview

Problem

Current methods for removing wood surface finishes are labor-intensive, hazardous, and often damage the wood surface due to uncontrolled heat application, leading to inefficient and discontinuous operations, especially when dealing with strongly bonded or deeply penetrating finishes.

Innovation Solution

An apparatus with controlled heat application elements integrated into a drag scraper, combined with air flow ducting for efficient finish removal, minimizing airborne particulates and heat buildup, and featuring temperature sensors and heat shielding for operator safety and comfort, allowing for continuous operation without extensive skill requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If uncontrolled heat application is used to remove finish, then finish removal efficiency is improved, but wood surface damage increases

Engineering Contradiction:

Improvefinish removal efficiencyVSAvoidwood surface damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies controlled heat at specific temperature parameters (heating the finish to a temperature beyond its specified operating tolerance but below the melting point) to break down the finish bonds without causing wood surface damage. This precise parameter control resolves the contradiction between removal efficiency and surface protection.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces aggressive mechanical scraping with thermal energy application. By using controlled heat to break down finish bonds chemically/physically before removal, the need for forceful mechanical action is reduced, thereby preventing wood surface gouging while maintaining productivity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If mechanical scraping is used to remove finish, then finish removal is achieved, but labor intensity and wood surface damage increase

Engineering Contradiction:

Improvefinish removal capabilityVSAvoidlabor intensity

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent substitutes thermal energy for mechanical scraping effort. The heating element softens and breaks down finish bonds, allowing removal with minimal mechanical force, thereby reducing labor intensity while maintaining effective finish removal capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

By changing the physical state of the finish through controlled heating (raising temperature beyond operating tolerance), the finish becomes easier to remove with less mechanical effort, reducing the labor intensity required for operation.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If excessive heat is applied to remove finish, then finish releases from wood surface, but finish builds up on blade and process slows down

Engineering Contradiction:

Improvefinish release effectivenessVSAvoidcontinuous operation capability

Core Design Contradiction:

ProductivityVSDuration of action of moving object

Solution Approach 1:

The patent precisely controls the heat temperature parameter to exceed the finish's operating tolerance for effective release but remain below the melting point threshold. This prevents finish from becoming sticky and building up on the blade, enabling continuous operation without interruption for cleaning.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If chemical solvents are used to remove finish, then finish removal is achieved, but hazardous waste generation increases

Engineering Contradiction:

Improvefinish removal effectivenessVSAvoidhazardous waste

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The patent replaces chemical solvent-based removal with thermal energy application. By using controlled heat to break down finish bonds, the process eliminates the need for chemical strippers and solvents, thereby preventing hazardous waste generation while maintaining effective finish removal.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Facilitates efficient, continuous, and minimally damaging finish removal with reduced airborne particulates and heat exposure, enabling smooth wood surface preparation for refinishing with minimal sanding and hazardous waste generation.

Implementation Method 1

The air stream is heated by a heating element to a temperature sufficient to break down the finish bonds

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

The cooled blade is drawn across the heated surface to scrape the softened finish from the wood

Methodology Applied

Scientific EffectMechanical scraping: Mechanical Force

Implementation Method 3

The blade may be cooled by a cooling element or air stream to prevent finish buildup

Methodology Applied

Scientific EffectForced convection cooling: Forced Convection

Data Source

PatentUS11124019B1Electrically powered stripping tool

Publication Date: 2021.09.21 CURTIS DONALD

AI summary

A finish removal tool for removal of a variety of finishes is provided having a rigid two-handled body, a scraper blade and ducted forced convection heating and cooling elements configured for continuous operation. Embodiments may include adjustable power levels, temperature sensor, indicator lighting, exhaust ducting and heat shields. A variety of scraper blade accommodations are described.