Screwdriver Conduit Reamer Multi-Diameter Design

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Solution Overview

Problem

Conduits cut with saw blades often have rough edges due to burs, which existing conduit reamers may not effectively smooth or debur, especially when dealing with varying diameters.

Innovation Solution

A screwdriver with a conduit reamer featuring multiple cylindrical portions of different diameters and a blade with reaming edges positioned between these portions, allowing for the reaming and deburring of conduits of various diameters, including a bit receiver for accommodating different tool bits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing conduit reamers are used to smooth conduit ends, then deburring is attempted, but they are ineffective for conduits of varying diameters

Engineering Contradiction:

Improveadaptability to various conduit diametersVSAvoideffectiveness of deburring

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The conduit reamer is divided into multiple cylindrical portions (first, second, third cylindrical portions) with different diameters, each capable of engaging conduits of different sizes. This segmentation allows a single tool to effectively deburr multiple conduit diameters by selecting the appropriate cylindrical portion for the specific conduit size.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If a single conduit reamer design is used, then device simplicity is maintained, but it cannot handle conduits of different diameters effectively

Engineering Contradiction:

Improvecapability to handle various conduit sizesVSAvoidstructure of conduit reamer

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The conduit reamer features nested cylindrical portions where the second cylindrical portion is positioned within the first cylindrical portion, and the third cylindrical portion is positioned within the second cylindrical portion. This nesting arrangement allows multiple diameters to be integrated into a single compact tool structure, enabling versatility without significantly increasing overall device complexity.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Productivity

If conduit ends are cut with saw blades, then cutting is achieved, but rough edges and burs are created

Engineering Contradiction:

Improvecutting speedVSAvoidburs and rough edges

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The conduit reamer is designed to be used immediately after cutting to perform preliminary cleaning and smoothing of the conduit ends. By removing burs and rough edges right after cutting, the tool prevents these harmful factors from remaining on the conduit surface, ensuring a smooth finish before further installation or connection work.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9089898B2Screwdriver including a conduit reamer

Publication Date: 2015.07.28 MILWAUKEE ELECTRIC TOOL CORP

AI summary

A screwdriver includes a handle, a screwdriver head coupled to the handle, and a conduit reamer coupled to the handle. The conduit reamer includes a first cylindrical portion having a first sidewall with a first diameter, and a second cylindrical portion positioned partially within and extending out of the first cylindrical portion. The second cylindrical portion has a second sidewall with a second diameter. The second diameter is smaller than the first diameter such that a gap is formed between the first and second sidewalls. The conduit reamer also includes a blade having a reaming edge positioned in the gap between the first and second sidewalls.