Movable Carriage Cable Cutting Unit for Rescue Winches
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Solution Overview
Problem
Cable winches in rescue helicopters often face issues where the rescue hoist hook or rope gets caught on objects, leading to potential hazards and requiring costly, time-consuming procedures to replace the entire rope upon return to the ground, disrupting rescue missions.
Innovation Solution
A cable cutting unit with a mechanically movable carriage that allows the cable cutting device to be triggered and then moved laterally, enabling the rope to be cut and unwound without blockage, allowing for continued operation and successful completion of rescue missions without the need for a redundant winch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stationary cable cutting device is used in the cable cutting unit, then the structure is simple, but the cable cannot be unwound after cutting due to blockage by the released knife edge
Solution Approach 1:
The cable cutting device is mounted on a movable carriage that can shift position between a first position (for cutting) and a second position (for unwinding). This dynamic repositioning allows the system to transition from a blocking state to a clear path state, enabling cable unwinding after cutting without requiring complex additional mechanisms.
2Reliability
If the entire rope is replaced after return to the ground, then the rescue mission can be completed, but valuable time is lost and the mission must be aborted during flight
Solution Approach 1:
The cable cutting device is positioned and activated in advance to cut the cable before the hook gets caught on ground objects. This preliminary cutting action prevents the need to replace the entire rope during flight, allowing the mission to continue without time loss while maintaining reliability.
3Reliability
If a redundant winch is installed in the helicopter, then the rescue mission can continue after cable cutting, but the helicopter becomes more heavy and costly
Solution Approach 1:
The movable carriage mechanism serves multiple functions: it positions the cutting device for cable severing and subsequently clears the cut cable from the path, enabling the same winch to continue operation after cutting. This multi-functionality eliminates the need for a separate redundant winch, reducing helicopter weight while maintaining mission continuation capability.
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 the rope to be efficiently cut and unwound, allowing for the installation of a replacement hook during flight, thereby preventing mission aborts and reducing the need for costly, time-consuming ground-based rope replacements, ensuring continuous rescue operations.
Implementation Method 1
a propellant charge, which can be arranged or can be arranged and configured in the cable cutting device in order to activate the knife
Data Source
Figure 1
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AI summary
A cable-cutting unit (100) for a cable winch comprises at least one cable-cutting device (102) for cutting a cable (108) running through the cable-cutting unit (100), and also comprises a slide (104) as well as a housing (106) with a cable channel (110) for guiding the cable (108) running through the cable-cutting unit (100), wherein the cable-cutting device (102) is, or can be, arranged on the slide (104) and the slide (104) is, or can be, arranged on the housing (106) such that it can be displaced, transversely to the cable channel (110), between a first position and a second position.