Heating Hand Tool Nozzle Thermal Isolation via Burnt Gas Cup

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Solution Overview

Problem

Heated hand tools often cause burns due to the nozzle heating up during prolonged use, as the combustion gas heats the nozzle, leading to temperature rises.

Innovation Solution

A lance design for heated hand tools where only the cup heats up, not the nozzle, with a sieve to prevent false flames and a cup to direct burnt gas away from the nozzle, ensuring the nozzle remains cool.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If the nozzle is heated by combustion gas to heat the tool, then the heating effectiveness is improved, but the nozzle temperature rises causing burn risk

Engineering Contradiction:

Improvenozzle temperatureVSAvoidburn risk

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The device segments the heating function from the nozzle by introducing a separate cup (chalice) component. The combustion gas heats the cup instead of the nozzle, and the cup is positioned to heat the tool while being isolated from the nozzle structure. This segmentation allows the nozzle to remain cool while still achieving effective tool heating through the intermediary cup.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cup serves as an intermediary element between the combustion gas and the tool. It receives heat from the combustion gas, then transfers that heat to the tool, while remaining physically separated from the nozzle. This intermediary approach allows heat transfer to the tool without the nozzle itself becoming hot enough to cause burns.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the combustion gas flows along the nozzle to heat the tool, then the heating efficiency is improved, but the nozzle absorbs heat causing temperature increase

Engineering Contradiction:

Improveheating efficiencyVSAvoidnozzle temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The heating path is segmented into two separate routes: combustion gas flows through the cup to heat the tool, while a separate air flow path moves along the nozzle without transferring significant heat to it. This segmentation enables efficient tool heating while keeping the nozzle temperature low.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cup acts as an intermediary that receives the full thermal load from combustion gas, while the nozzle serves as a separate structural component that guides the tool and receives minimal heat. This intermediary arrangement decouples the heating function from the nozzle, maintaining heating efficiency while protecting the nozzle from excessive temperature rise.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If the nozzle structure is simplified, then the device complexity is reduced, but the ability to prevent temperature rise is compromised

Engineering Contradiction:

Improvenozzle structure complexityVSAvoidnozzle temperature control

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The device is segmented into distinct functional components: a simplified nozzle structure for tool guidance and a separate cup assembly for heat transfer. This segmentation allows the nozzle to remain structurally simple while the cup handles the thermal management function, achieving both simplicity and temperature control.

Inventive Principle:

Principle #1Segmentation

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

Prevents nozzle temperature rise and reduces the risk of burns by isolating the nozzle from hot gas, maintaining safe operation.

Implementation Method 1

a cup (4) burnt gas discharge positioned at the second end (22) of the nozzle (2)... The cup (4) exhaust directs the gas burned by the flame so that it remains out of contact with the nozzle (2)

Methodology Applied

Scientific EffectGas flow direction control:

Implementation Method 2

The cup also comprises at least one sieve, advantageously one or two sieves, inside the duct to suppress a false flame forming at the outlet of the nozzle

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 3

a burner that ignites the combustion gas. The ignited gas is used to heat various tools... a flame... which heats the element to be heated

Methodology Applied

Scientific EffectCombustion: Combustion

Implementation Method 4

there is no rise in temperature along the nozzle, or at the very least, the rise in temperature is limited. Indeed only the cup heats up and not the nozzle

Methodology Applied

Scientific EffectThermal isolation: Thermal Insulation

Data Source

PatentEP2568217B1Head for a heating hand tool with no temperature increase along the nozzle

Publication Date: 2018.10.24 GUILBERT EXPRESS SA

Figure 1~4
Figure 5~6

AI summary

The head (1) has a conduit connected to a handle of a heating hand tool by one end (21) of the conduit. The conduit comprises a fuel gas inlet (23) and a conductive wire (24) forming an electrode for a spark starter. A grid (25) is placed at another end (22) of the conduit for fixing with the starter of the spark in combustible gas flow for ignition of flame. The wire extends through the grid and out of the conduit. A burnt gas evacuation cup (4) is positioned on level of the latter end. The cup directs the burnt and heated gas such that it remains out of contact with the conduit.