The photographs show the same system applied using real devices.
Rope rescue hauling systems.
For rescue first response and emergency service professionals across fire search and rescue law enforcement and other ems agencies.
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 systems we ve seen thus far i e the 1 1 2 1 and 3 1 are all simple systems.
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.
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 hauling is completed on the right hand rope while the backup rope is taken in on the left.
Another method that can be used is to piggyback a mechanical advantage system on a haul line.
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.
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.
The 4 1 system can be rigged as either a simple or compound system.
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 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.
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.
3 1 system the 3 1 is the classic mechanical advantage system used by rescuers.
Risk of jamming due to rope getting crossed while sending the pulley to the victim requires a lot of rope.
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.
Any ultimate benefit from the rescue maneuver hinges upon pulleys systems for rescue industrial rope.
The obvious challenge of importance to the rescue attempt is the need to get the victim down.
The victim participates fully in the haul effort.
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.
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.
