Protective Cover Bow Integrates Cooling Line

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Solution Overview

Problem

Existing hand-held cut-off machines face issues with flexible hose lines for cooling liquid that are difficult to secure, becoming damaged or obstructive during angular adjustments and challenging cutting tasks.

Innovation Solution

A protective cover design with a bow-shaped handle that integrates the supply line section between injection nozzles externally, providing a secure and compact module that avoids exposed lines and prevents damage, using a bow that acts as both a handle and a mounting mechanism for the nozzles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If flexible hose lines are used to supply cooling liquid to injection nozzles, then the supply line can be easily routed, but the hose lines become difficult to secure, can become damaged or obstructive during angular adjustments and cutting tasks

Engineering Contradiction:

Improverouting of supply lineVSAvoidsecurity of supply line

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent integrates the supply line directly into the protective cover structure, merging the previously separate hose line and cover components into a unified construction. This eliminates the security issues of separate hose lines while maintaining routing flexibility through integrated channels within the cover.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of manufacture

If the supply line is routed externally along the protective cover, then the line is accessible for connection, but it becomes exposed to mechanical damage and interference during operation

Engineering Contradiction:

Improveaccessibility for connectionVSAvoidmechanical damage to supply line

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The supply line is nested within the protective cover structure, with the line embedded in channels or cavities of the cover. This protects the line from external mechanical damage while maintaining accessibility through designated connection points on the cover exterior.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Adaptability or versatility

If the protective cover is designed to be pivotable for angular adjustments, then it can adapt to different cutting positions, but the supply line becomes obstructive or damaged during adjustment

Engineering Contradiction:

Improveangular positioningVSAvoidadjustment of protective cover

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

By integrating the supply line into the protective cover as a unified structure, the line moves together with the cover during angular adjustments. This eliminates the obstruction and damage issues that occur when separate hose lines interfere with the pivotable movement of the cover.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7520799B2Protective cover for a hand-held cut-off machine

Publication Date: 2009.04.21 ANDREAS STIHL AG & CO KG

AI summary

A protective cover of a hand-held cut-off machine has a cover member having an interior. At least two injection nozzles for spraying a cooling liquid into the interior are arranged on the cover member. A supply line for supplying the cooling liquid to the at least two injection nozzles is provided. A bow is arranged outside of the cover member. The supply line has a line section that extends from a first injection nozzle to a second injection nozzle through the bow.