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2. Self-locking device - Wikipedia

   en.wikipedia.org/wiki/Self-locking_device

   The earliest type of self-belay device used was the ubiquitous prusik knotted sling used by climbers. The method requires the solo climber to feed out an estimated length of belay rope so that they can reach their next stance and repeat the process as the rope is difficult to feed through the prusik knot while climbing.

3. Munter hitch - Wikipedia

   en.wikipedia.org/wiki/Munter_hitch

   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 ...

4. Bulk-handling crane - Wikipedia

   en.wikipedia.org/wiki/Bulk-handling_crane

   Ring discharge grabs have a single supporting rope or chain which means that a port with limited craneage, or even a ship's lifting boom can be used at a port where no facilities are available for bulk handling to load or offload the cargo. A cast steel ring is hung from the end of the boom through which the rope or chain passes to the grab.

5. Rock-climbing equipment - Wikipedia

   en.wikipedia.org/wiki/Rock-climbing_equipment

   Self-locking devices (SLDs), also called progress capture devices (PCDs), are the terms given to the broader class of rope devices that allow the climbing rope to move more freely in one direction but will lock quickly if the rope tries to move in the opposite direction. Their basic action means that several can also be used as emergency ...

6. Prusik - Wikipedia

   en.wikipedia.org/wiki/Prusik

   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)).

7. Belay device - Wikipedia

   en.wikipedia.org/wiki/Belay_device

   Self-belay devices are designed to allow solo climbing where the climber wears the belay device, or secures it to a fixed object on the ground. These devices automatically lock without any intervention when the rope passing through reaches a sufficient velocity (during a fall), but allow rope to move relatively freely whilst climbing.