Firefighter Tool Sinusoidal Jaw for Hose Coupling
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Solution Overview
Problem
Firefighter tools lack the ability to effectively engage and uncouple diversely sized and configured fire hose couplings, particularly when they are seized tight, due to limited operational range and inadequate contact surface area.
Innovation Solution
A firefighter tool with a sinusoidal curvature surface and a facingly disposed hook allows for engagement of couplings from 1½″ to 5″ in diameter, featuring a pivot mechanism that opens to at least 70°, providing a large torque force and effective uncoupling of seized couplings through a combination of convex and concave surfaces and a rectilinear hook construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional firefighter tool with limited operational range is used, then the device complexity is reduced, but the adaptability to engage diversely sized and configured couplings deteriorates
Solution Approach 1:
The tool incorporates a movable hook that can be repositioned along the handle to engage couplings of different sizes. The hook's position is adjusted dynamically based on the coupling diameter, allowing the same tool to adapt to various coupling configurations without requiring multiple specialized tools.
Solution Approach 2:
The firefighter tool is designed with multiple functional elements including a sinusoidal curvature surface for engaging couplings, a movable hook for diversified coupling engagement, and a plier mechanism. This multi-functional design allows a single tool to perform various coupling engagement tasks across different fire hose sizes.
2Force
If a tool with limited contact surface area is used, then the ease of manufacture is improved, but the force transmission capability to uncouple seized couplings deteriorates
Solution Approach 1:
The tool features a sinusoidal curvature surface that provides extended contact area with the coupling. This curved surface design increases the surface area for force transmission compared to flat surfaces, enabling better engagement and torque application to uncouple seized connections.
3Power
If a tool with limited opening angle is used, then the device complexity is reduced, but the ability to exert large torque force on opened handles deteriorates
Solution Approach 1:
The plier mechanism is designed with a pivot connection that allows the handles to open to a wide angle. This dynamic opening capability enables the user to apply force at optimal angles for generating large torque forces when uncoupling seized connections, while the pivot connection maintains structural integrity.
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 tool enables effortless operation with variously sized and configured fire hose couplings, exerting a substantial torque force to readily rotate and uncouple even tightly seized connections, demonstrating enhanced versatility and effectiveness.
Implementation Method 1
The combination of the generally sinusoidal surface and the facingly disposed hook permits a user to variously operably engage diversely sized and configured couplings. The tool member may be of one-piece unitary construction.
Implementation Method 2
The pliers are configured to open so that the fully opened handles subtend an angle of at least about 70°. The user in one mode of operation grips one handle and exerts a large force, through bearing surfaces on the opened jaws, to the wrench end generally sinusoidal surface and to the hook to quickly open seized fire hose couplings.
Data Source
AI summary
A firefighter tool has pivotably connected handles and jaws, and one handle has an outer generally sinusoidal surface and the handle end is formed with a hook facingly disposed to the generally sinusoidal surface. The handles open fully so that the user grips the other handle and the sinusoidal surface hook alternately operably contactingly engages differently sized and configured fire hose couplings.