Portable Brittle Pipe Cutter Chain Tensioning

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Solution Overview

Problem

Existing pipe cutters are not suitable for limited access environments due to their bulky components and inability to accommodate installed or buried pipes, making them inefficient and impractical for cutting relatively brittle pipes like cast iron soil pipes.

Innovation Solution

A portable pipe cutter that utilizes a cutting chain tensioned by a press tool, featuring a frame with a linearly displaceable ram and a selectively positionable slider block, allowing for compact design and effective cutting in confined spaces by reducing the cutting confine when the chain is positioned around the pipe.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If lever arms are used to transmit force to a ratchet assembly for tightening the cutting chain, then sufficient cutting force can be generated, but the device becomes too large and cannot be used in limited access environments

Engineering Contradiction:

Improvecutting forceVSAvoiddevice size

Core Design Contradiction:

ForceVSVolume of moving object

Solution Approach 1:

The invention extracts the force transmission function from the traditional lever arm-ratchet assembly and relocates it to a power take-off mechanism directly coupled to the cutting chain. This allows the long lever arms to be removed while maintaining sufficient cutting force through direct powered tensioning of the chain.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The manual mechanical advantage system (lever arms and ratchet assembly) is replaced with a powered mechanical system (power take-off mechanism with motor or engine). This substitution provides the necessary cutting force without requiring the operator to manually apply large forces through long lever arms, thereby reducing device size.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Force

If scissor mechanisms are used to generate amplified cutting force, then sufficient cutting power can be achieved, but the mechanism becomes obstructed in limited access environments

Engineering Contradiction:

Improvecutting forceVSAvoidaccessibility

Core Design Contradiction:

ForceVSEase of operation

Solution Approach 1:

The invention extracts the force amplification function from the scissor mechanism and implements it through a power take-off mechanism. This allows the cutting chain to be tensioned directly by the powered mechanism without requiring the chain to pass through or around the cutting location, eliminating obstruction issues in confined spaces.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The power take-off mechanism acts as an intermediary between the power source and the cutting chain, providing force transmission without requiring physical access to the cutting location. This intermediary mechanism can be positioned remotely while still effectively tensioning the chain around the pipe.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Force

If large work surfaces and power assist systems are enclosed for cutting uninstalled pipe, then cutting power is sufficient, but the device is not portable and cannot be transported between sites

Engineering Contradiction:

Improvecutting forceVSAvoiddevice weight

Core Design Contradiction:

ForceVSWeight of moving object

Solution Approach 1:

The invention segments the cutting system into a portable cutting head containing only the essential cutting chain and tensioning mechanism, separate from the power source. The power take-off mechanism can be coupled to existing portable power sources, allowing the cutting component to be lightweight and transportable while still delivering sufficient cutting force when connected.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The power take-off mechanism is designed to be compatible with various portable power sources (motors, engines), making the cutting device universally applicable and adaptable to different power availability scenarios. This multi-functionality allows the same cutting mechanism to work with different power sources without requiring a dedicated heavy enclosed power system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables quick and convenient cutting of various pipe sizes in limited access environments with reduced setup time and improved portability, allowing for efficient cutting of brittle pipes without the need for extensive access or additional excavation.

Implementation Method 1

The ram is movable in a first direction upon application of a compressive force from the powered cylinder of the press tool

Methodology Applied

Scientific EffectCompressive force: Compression

Implementation Method 2

Operation of the press tool and displacement of a ram causes tightening of the cutting chain

Methodology Applied

Scientific EffectMechanical advantage: Mechanical Advantage

Implementation Method 3

a cutting chain wrapped about a pipe to be cut

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 4

subsequent fracture and/or cutting of the pipe

Methodology Applied

Scientific EffectAbrasion: Abrasion

Data Source

PatentUS8225511B2Portable direct action brittle pipe/soil pipe cutter

Publication Date: 2012.07.24 EMERSON ELECTRIC CO

AI summary

A lightweight, portable, and relatively small cutting tool is described. The tool engages with a standard press tool and is used for cutting brittle pipe such as cast iron soil pipe. The tool features a cutting chain assembly that is tensioned about the pipe by a movable ram block. The ram block is displaced by a ram or hydraulic cylinder in the press tool.