Handheld Hot Air Outlet Warning Using Timed Optical Signaling
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Solution Overview
Problem
Existing hand-held hot air devices pose a risk of burns due to improper handling, as the metallic air outlet piece remains extremely hot after shutdown, and existing mechanical temperature indication mechanisms are prone to errors, costly, and not suitable for mass production.
Innovation Solution
A hand-held hot air device with an optical signaling system that independently signals a risk of burns for a predetermined time after shutdown, using energy storage means like capacitors to power signaling means such as light-emitting diodes, ensuring a safe cooling period without relying on actual air outlet piece temperature measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical temperature indication mechanism using bimetal is used, then the risk of burns can be indicated without electrical power supply, but the indication is prone to errors due to non-optimal mechanical contact and mechanical faults such as jamming
Solution Approach 1:
The patent replaces the mechanical bimetal temperature indication mechanism with an optical signaling system. The optical signal is generated by a light source that is optically coupled to a temperature-sensitive material. When the air outlet piece is hot, the material's optical properties change, causing the light to scatter or absorb differently, making the signal visible or invisible to indicate burn risk. This substitution eliminates mechanical contact issues and jamming problems while maintaining reliability.
Solution Approach 2:
The patent introduces an optical intermediary (light signal) between the temperature condition and the operator. Instead of direct mechanical contact between the bimetal and the indication mechanism, the temperature state is transmitted through optical properties of a material that changes with temperature. This intermediary transfers the temperature information reliably without mechanical wear or contact issues.
2Reliability
If precise adjusting means made of bimetal are used, then burn risk can be indicated, but production and manufacture become expensive with unavoidable scattering effects in series production
Solution Approach 1:
The patent uses inexpensive optical components such as LED light sources and simple temperature-sensitive optical materials instead of precision bimetal adjusting means. These components are cheap to manufacture, have no wear issues, and can be easily replaced if needed. The optical system maintains accurate burn risk indication without the scattering effects and precision requirements of mechanical bimetal components.
Solution Approach 2:
The patent exploits changes in optical parameters (light absorption, scattering, or emission characteristics) of a material in response to temperature changes. This parameter change provides a direct, linear, and repeatable indication of temperature state without the non-linear and scattered response characteristics of mechanical bimetal systems. The optical parameter changes are easily measurable and consistent across mass production.
3Loss of time
If temperature measurement and heat dissipation monitoring are used to signal burn risk, then accurate timing can be achieved, but the system becomes complex and expensive
Solution Approach 1:
The patent makes the optical signaling system self-service by using the inherent optical properties of a temperature-sensitive material that automatically responds to the temperature state of the air outlet piece. No external temperature sensors, measurement circuits, or control systems are needed. The material itself provides the temperature information through its optical characteristics, eliminating complex monitoring equipment while maintaining accurate cooling time indication.
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
This solution effectively reduces the risk of burns by providing a reliable and inexpensive warning system that adapts to safety regulations, ensuring operator safety without the need for complex temperature measurement, suitable for mass production and ensuring safety without significant disadvantages.
Implementation Method 1
signaling means (16), which have a light source (17) and a temperature-sensitive material (18)
Data Source
Figure 1
AI summary
The device has an optical signaling unit (16) for signaling a heating state of an air outlet piece. The signaling unit is formed for signaling time independent of actual temperature of the air outlet piece after switching off a metallic switching on- and off heating unit (10), where the signaling time is predetermined by a timing unit. The timing unit comprises electrical energy storage units (14). The energy storage units are attached to the signaling unit such that the energy storage units are discharged in an off state of the heating unit by operating the signaling unit. The energy storage units are designed as capacitors (15), accumulators and/or batteries.