【一日一结】Purcell Prusik Loop

我们一起传递正能量～

▍来源：animatedknots、互联网

在攀登过程中，绳结打法的对错和速度有时关乎性命，因此熟悉各种绳结的打法与其功能是极其重要的。绳结技术的掌握来自不断的练习，体会。初时可按图依样，然后离开书练习，甚至单手打出。每一个步骤都要非常正确，毫不含糊。要做到在黑暗中或其他各种条件下能自如打结，同时也应知道如何解开结，因为在许多危险时刻，不会解开结比不会打结更糟糕。所有的绳结在完成后都需收紧才能使用，同时绳端至少预留5厘米，以免意外松脱。

Purcell Prusik Loop

Purcell Prusik Loop is an adjustable loop suitable for making the components of the Purcell Prusik System and an adjustable tether. - The Purcell Prusik System is standard personal protective equipment for many rescue personnel operating in technical Search and Rescue settings.

Purcell Prusik Tying

Lay the rope out to form two loops with the ends ovelapping. Use the overlapping section to tie a Figure 8 knot. Twist the long loop to form a pair of three-turn coils. Position these coils to form a tube. Pass the short loop and the Figure 8 Knot through the tube. Tighten the tube and adjust the length.

Uses: 

This system is utilized for a wide range of applications including: adjustable attendant/patient tethers, load releases/transfers, or friction hitches/rope grabs.

The Purcell Prusik System comprises three components: a long foot Purcell Prusik, a short foot PurcellPrusik, and a harnesss or waist Prusik. The top of the Figure of Eight loop on the long one should reach the chest/nipple height of the rescuer; the top of the Figure of Eight loop on the short one should reach the rescuer's iliac crest (top of hip bone.) The Harness Prusik should reach from the chest/ nipple line to a height about 4 inches above the helmet. See the measuring guide below.

The Purcell Prusik Adjustable Tether uses a Purcell Prusik Loop. It must be used with the small loop at the bottom. Then, if the climber grabs the Figure 8 Knot, it holds instead if slipping.

Measuring Guide: Typically constructed with 6 or 7 mm cord with the following overall lengths: 1.5-2.0 meters (Harness); 3.5 meters (Short); and, 4.5 meters (Long). The picture (right) shows the usual length for the small loop and for the overlap.

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