Another method that can be used is to piggyback a mechanical advantage system on a haul line.
Rope rescue hauling systems.
The systems we ve seen thus far i e the 1 1 2 1 and 3 1 are all simple systems.
Access for technicians using rope and other rigging systems to perform work at height or who work in hazardous environments that may require specialized safety equipment to prevent falls or other on the job.
Rope team of two tied in mid rope with the ends free and reserve rope stored in the packs.
Notice however that the end of the rope on 2 1 systems is attached to the anchor whereas the end of the rope on 3 1 systems is attached to the load.
It requires less rope than a non piggybacked 2 1 system is reasonably easy to rig is easy to add a progress capture device provides an appropriate amount of mechanical advantage to raise one or two people and with a few tweaks it can be converted into a simple 5 1 system.
For rescue first response and emergency service professionals across fire search and rescue law enforcement and other ems agencies.
I set this system up in the lab and measured the actual hauling tension applied to raise a 100kg technician for each of four different scenarios.
Any ultimate benefit from the rescue maneuver hinges upon pulleys systems for rescue industrial rope.
The photographs show the same system applied using real devices.
A simple 4 1 system is built by starting at the anchor and threading the rope through pulleys on the load the anchor and back to the load.
The victim participates fully in the haul effort.
As one of the most versatile tools in rope rescue the cmc aztek proseries system reflects our philosophy of keeping rigging equipment simple efficient light compact and multi purpose.
The 4 1 system can be rigged as either a simple or compound system.
Even if you only need to raise a load 20 feet using a 5 1 you will have to pull a whopping 100 feet of rope and probably reset the system many times.
The load is supported on a separate rope held by a ratchet and a pre rigged mechanical advantage system is connected to the haul line with a prusik hitch when the load needs to be raised.
The downside of systems with a 5 1 or higher mechanical advantage is you have to pull a lot of rope to move the load a short distance.
Risk of jamming due to rope getting crossed while sending the pulley to the victim requires a lot of rope.
Originally developed by reed thorne of arizona based ropes that rescue the aztek arizona technician s edge kit is used worldwide and offers more than.
2 to 1 victim weight divided by 2.
Whether the end of the rope connects to the anchor or to the load is a subtle difference between mechanical advantage systems that have an even number e g 2 1 4 1 6 1 etc and systems that.
The obvious challenge of importance to the rescue attempt is the need to get the victim down.
