Aerosol Fire Extinguisher Trigger Sprayer One-Handed Operation
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Solution Overview
Problem
Traditional fire extinguishers are bulky and complex, making them difficult to use effectively in firefighting situations, particularly in requiring two hands and lacking portability.
Innovation Solution
An aerosol fire extinguisher with a trigger sprayer mechanism that allows easy one-handed operation by using a propellant and fire extinguishing agent combination, where the trigger sprayer is locked until the tab is pulled, enabling rapid and directed discharge of the agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional fire extinguisher is used, then fire extinguishing capability is provided, but the device is bulky and complex making it difficult to use effectively
Solution Approach 1:
The fire extinguisher is divided into distinct functional components: an aerosol can containing the fire extinguishing agent and propellant, a separate trigger sprayer mechanism with tab, and a mounting cup assembly. This segmentation allows each component to be optimized independently and simplifies the overall operation by separating the discharge trigger (tab) from the main body.
Solution Approach 2:
The complex pull pin mechanism is extracted and replaced with a simple tab that breaks away from the trigger assembly. This extraction eliminates the need for complicated pin-based safety mechanisms while maintaining safety through the breakaway tab design, significantly simplifying the user interface.
2Ease of operation
If a traditional fire extinguisher is used, then fire extinguishing capability is provided, but the device requires two hands and lacks portability
Solution Approach 1:
The trigger sprayer mechanism is merged with the aerosol can through the mounting cup assembly, creating an integrated unit where the trigger assembly is permanently attached to the can. This merging eliminates the need for separate handling of components and enables one-handed operation while maintaining a compact, portable form factor.
Solution Approach 2:
The trigger mechanism incorporates dynamic elements including a pivotable trigger that rotates about a pivot point, a breakaway tab that separates under sufficient force, and a spring-loaded actuator stem that provides automatic reset. These dynamic features enable intuitive one-handed operation while keeping the overall device lightweight and portable.
3Reliability
If the trigger sprayer is locked until tab is pulled, then safety is improved, but the mechanism requires additional components
Solution Approach 1:
The breakaway tab is pre-positioned in a locked state that prevents trigger actuation. The tab is designed to break away at a predetermined location when sufficient force is applied, automatically transitioning the mechanism from locked to unlocked state. This preliminary positioning provides inherent safety without requiring complex locking mechanisms.
Solution Approach 2:
The trigger mechanism is designed to be self-regulating through the breakaway tab system. Once the tab breaks away, the trigger becomes freely movable without requiring additional unlocking actions. The mechanism automatically transitions from safe/locked to operational/unlocked state through the physical breaking of the tab, eliminating the need for separate locking/unlocking controls.
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
The aerosol fire extinguisher with a trigger sprayer provides a lightweight, portable, and easy-to-use solution for firefighting, ensuring effective and efficient extinguishing of fires with the agent being discharged only when needed, enhancing user safety and convenience.
Implementation Method 1
the propellant in the can to push the Fire Extinguishing Agent up through the stem through the Trigger Sprayer Unit through the Direction Chamber then through the Nozzle
Implementation Method 2
The Mounting Cup of the aerosol can has a actuator stem that when it is depressed cause the fire Extinguishing Agent to flow out. The propellant can be CO2, Air, Nitrogen or 134a.
Data Source
AI summary
An Aerosol Fire Extinguisher with Trigger Sprayer that can be easily held in one hand. The extinguishing agent is under pressure in an aerosol can and can only be released by pulling the tab of the trigger sprayer. The Trigger Sprayer Unit cannot be sprayed until the tab is pulled. The Can is a cylindrical canister housing and has a Dip Tube that goes to the bottom of the can to the Fire Extinguishing Agent. There is Propellant in the can that pushes the Fire Extinguishing Agent up through the Dip Tube. Pulling the tab of the Sprayer Unit allows the Trigger to be pressed and be moved so the Trigger Pivoting Member of the Trigger Sprayer Unit is able to press down on the stem of the Mounting Cup of the Can which then allows the Propellant in the Can to force the Fire Extinguishing Agent through the Dip Tube up through the Chamber Hole into the Direction Chamber with pressure out the Nozzle toward the fire. The user then holds down the trigger and sprays the fire with the Fire Extinguishing Agent until the fire is out.