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The rope to be pulled is passed through a pulley, and a Prusik is tied on the loaded side. When the rope is pulled, the Prusik rides against the pulley, and the rope slides through it; but when the rope is relaxed, the Prusik slides away from the pulley and grabs the rope. Thus, the combination acts as a ratchet (or Progress Capture Device (PCD)).
When a belayer needs to transfer the load from their harness to the anchor to escape the system: a rope grab (mechanical or friction knot/Prusik) is placed on the load line towards the load, rope is terminated on the rope grab (or the tails of accessory cord are used when using a cordelette with a Prusik as a rope grab) and runs back to the ...
The mechanism on chain grabs operates in the same way as on rope grabs. The chains are connected to ropes on the crane by (e.g. bordeaux) couplings which allow rotation. A linked chain requires a much small diameter pulley than the equivalent rope which makes a smaller, more compact, design of girder.
Rope rescue is a subset of technical rescue that involves the use of rope, be it steel or cable rope, or more commonly used nylon, polyester, or other type of rope. Kernmantle (kern = core and mantle = sheath) rope as it is called, is available in various types: dynamic (stretches to absorb the shock of a falling lead climber or rescue ...
A grab or mechanical grab is a mechanical device with two or more jaws (sometime clamshell-shaped), used to pick things up or to capture things. Some types include: Roundnose grab; Clamshell grab; Orange-peel grab in Dutch and German they are called poliep grijpers/ Polypengreifer = "polyp grabs". There are different ways of open/close the grabs:
Eight mattresses were stacked on the car roof, secured with rope. The raids had torn the facades off surrounding structures, exposing bathroom pipes and entire kitchens to the outdoors.
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