Knot loop
The node loop is similar to the clamping wedge a mobile securing means when rock climbing . It consists of an accessory cord that is knotted in such a way that it has a loop on the one hand and a - usually - round knot on the other. This knot is inserted into a crack in the rock, so that it jams under load in the crack and forms a fixed point . The carabiner through which the mountain rope runs is hooked into the loop .
This safety technology was developed by climbers in Saxon Switzerland . Knot loops are still used there instead of wedges to protect the sensitive sandstone of the local climbing peaks . The rock cracks required for securing are therefore less worn. If clamping devices made of aluminum or titanium were used, the wear on the cracks in the rock would be significantly higher due to the hard surface of these devices; their use is therefore prohibited in the Elbe Sandstone Mountains .
This erosion problem does not occur in climbing areas with limestone, volcanic and granite rock, so that knot loops are used today almost exclusively in Saxon Switzerland and comparable sandstone climbing areas such as the Zittau Mountains or Bohemian Switzerland .
As a node z. B. sack stitch , double figure eight knot , diamond knot , monkey fist or stopper knot are used.