Rescue Tool with Sinusoidal Handles for Fire Hose Couplings
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Solution Overview
Problem
Firefighter tools lack the ability to efficiently cut heavy-duty metal sheath cables and engage diverse-sized fire hose couplings with sufficient torque and versatility, particularly in exigent circumstances.
Innovation Solution
A firefighter tool with elongate handles that can be gripped separately for cutting heavy-duty cables and fully opened to engage diverse-sized fire hose couplings, featuring a sinusoidal outer surface and elongate arcuate jaws, allowing for high torque force application and rapid uncoupling of seized couplings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tool uses a planar contact surface for engaging fire hose couplings, then the structure is simple, but the range of utility is limited and cannot engage diverse-sized couplings effectively
Solution Approach 1:
The handle transitions from a static planar surface to a dynamic sinusoidal outer surface that can adapt its contact geometry. The sinusoidal profile allows the handle to engage diverse-sized couplings by providing varying contact points and geometries, enabling the same handle to effectively engage different coupling sizes through its contoured surface.
Solution Approach 2:
The sinusoidal outer surface introduces local variations in geometry along the handle's length, creating multiple zones with different contact characteristics. This allows different portions of the handle to engage different sized couplings effectively, with each local region optimized for specific coupling dimensions while maintaining overall handle simplicity.
2Ease of operation
If the handles are limited to a small opening angle for cable cutting, then the cutting function is achieved, but the tool cannot be comfortably gripped and operated for coupling engagement
Solution Approach 1:
The handle system dynamically adjusts its configuration between two operational states: a closed position optimized for cable cutting with reduced opening angle, and a fully opened position optimized for coupling engagement with increased opening angle up to approximately 114 degrees. This dynamic reconfiguration allows the tool to achieve comfortable gripping and operation for coupling engagement while maintaining cutting capability.
3Adaptability or versatility
If the tool is designed for heavy-duty cable cutting, then cutting capability is improved, but the tool lacks the ability to engage diverse-sized fire hose couplings with sufficient torque
Solution Approach 1:
The tool integrates multiple functions into a single device: the elongate handles with sinusoidal outer surfaces provide both the structural strength needed for heavy-duty cable cutting and the adaptive geometry required for engaging diverse-sized fire hose couplings. The same handle structure that provides leverage for cutting also provides the contoured surface for effective coupling engagement, achieving universality without compromising either function.
4Force
If the handles are made elongate for high torque application, then the torque force for uncoupling seized couplings is improved, but the tool complexity and size increase
Solution Approach 1:
The elongate handles serve dual purposes: their length provides the mechanical advantage needed for high torque application when uncoupling seized fire hose couplings, while their sinusoidal outer surface profile provides the adaptive engagement geometry for diverse-sized couplings. This universal design achieves both high torque capability and coupling adaptability within a single handle configuration, avoiding the need for separate specialized tools.
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
Enables effective cutting of heavy-duty cables and rapid uncoupling of fire hose couplings with high torque force, improving operational efficiency in both confined and unconfined spaces.
Implementation Method 1
The elongate contoured handles and elongate arcuate jaws cutting edges provide improved cutting of heavy duty electrical cable such as an aluminum shielded hybrid car battery cable. The wedge edge is disposed at between 85° and 89°, and preferably 88°, of the tool center plane in the fully closed position. The wedge is contoured to be effectively and comfortably separately gripped in the fully opened or second mode position to engagingly the fire hose coupling is engaged by the sinusoidal outer surface and hook of the opposed handle.
Implementation Method 2
The Gillingham tool 1 includes handle 7 and handle 8 having a planar contact surface 2 for engaging small sized fire hose couplings (not shown), wherein there is line contact between the coupling cylindrical surface and the handle planar contact surface 2.
Data Source
AI summary
A rescue tool includes a fully pivotally opened handle in an obtuse angle disposition with one handle separately gripped and then a force transmitted through force bearing surfaces to the oppositely disposed handle having an outwardly disposed sinusoidal surface and juxtaposed hook end which engage a seized fire hose coupling. A high torque force is readily exerted through the handles on the seized fire hose coupling. The elongate handles and pivotally disposed jaws having elongate arcuate cutting edges corporately provide rapid cutting of aluminum sheath hybrid car battery cables in a further rescue operation.