Dual-Function Spear for Cartridge Fire Extinguisher Status
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Solution Overview
Problem
Cartridge-operated fire extinguishers pose safety risks during servicing due to potential premature pressurization and leakage, which can lead to accidents or render the extinguisher unsuitable for use in emergencies.
Innovation Solution
A cartridge-operated fire extinguisher with a dual-purpose spear that pierces the gas cartridge to charge the extinguisher and indicates pressurized fluid release by moving to a second position, providing a visual indicator of the extinguisher's status, thus ensuring safety during servicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cartridge is removed and weighed during servicing to check for propellant leakage, then the reliability of the fire extinguisher can be maintained, but the complexity of the servicing process increases and safety risks arise from potential premature pressurization
Solution Approach 1:
The spear mechanism performs self-indication of pressurization status automatically during servicing operations. When the cartridge is removed or pressurization occurs, the spear moves to indicate the state without requiring technician intervention or additional monitoring devices, thereby maintaining reliability while simplifying the servicing process.
Solution Approach 2:
The spear provides immediate visual feedback about the pressurization status of the fire extinguisher. This feedback mechanism allows technicians to know the current state without complex measurement tools, enabling safe and efficient servicing while ensuring the extinguisher is properly charged.
2Productivity
If the cartridge is screwed back into the valve body during reassembly, then the fire extinguisher is restored to operational status, but the risk of cross-threading or leakage increases which can cause premature pressurization
Solution Approach 1:
The spear is positioned to indicate pressurization status before the cartridge is fully reinstalled. This preliminary indication allows technicians to verify proper installation and avoid premature pressurization, enabling efficient reassembly while maintaining safety by preventing incorrect cartridge installation.
Solution Approach 2:
The spear acts as an intermediary indicator between the cartridge installation process and the final pressurized state. It provides a visual signal that mediates the transition from unpressurized to pressurized state, allowing technicians to confirm proper installation before the system becomes operational.
3Ease of operation
If a spear is used to pierce the gas cartridge to charge the fire extinguisher, then the extinguisher is prepared for immediate use, but the spear must be designed to serve dual purposes of piercing and indicating pressurization status
Solution Approach 1:
The spear is designed with multi-functionality to both pierce the cartridge seal and indicate pressurization status through its movement. This single component performs multiple critical functions during activation, simplifying the overall operation while avoiding the need for separate piercing and indication mechanisms.
Solution Approach 2:
The piercing function and indication function are merged into a single spear mechanism. The same physical component that breaches the cartridge seal also serves as the indicator by moving to a visible position, combining two essential functions into one integrated element for ease of operation.
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 spear's dual functionality ensures the extinguisher is safely prepared for use and indicates when it is pressurized or leaking, reducing the risk of accidents and ensuring it is ready for immediate deployment.
Implementation Method 1
A cartridge-operated fire extinguisher with a spear moveable from an initial first position in a first direction to pierce the gas cartridge, and moveable in a second direction to a second position to thereby indicate that pressurised fluid has been released from the gas cartridge
Data Source
AI summary
A cartridge-operated fire extinguisher comprising a gas cartridge 124 for storing pressurised fluid 126 therein, and a spear 150 moveable from an initial first position in a first direction to pierce the gas cartridge 124, and moveable in a second direction to a second position to thereby indicate that pressurised fluid 126 has been released from the gas cartridge 124.