Pulley Systems

WHAT YOU NEED TO KNOW ABOUT THE PETZL SPIN PULLEYS

WHAT YOU NEED TO KNOW ABOUT THE PETZL SPIN PULLEYS For rescue teams all over the world, having the most efficient equipment possible for whatever situation they may face, is an absolute priority. Released in 2020, the Petzl MAESTRO descender with integrated progress-capture pulley delivers exactly that. In addition, the family of SPIN pulleys rounds …

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MORE IS POSSIBLE ~ Introducing the 13 mm CMC CLUTCH™ BY HARKEN INDUSTRIAL™

CMC CLUTCH by Harken Industrial is the latest evolution in rescue and rope access hardware. The CLUTCH is patented and made in the USA by CMC and Harken Industrial in a partnership that combines over 90 years of experience in rescue and rope management. Suited to a multitude of rigging operations, the CLUTCH moves seamlessly …

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Recommended Rope Systems ~ Two Tension Rope System (TTRS) Raise and Lower

Recommended Rope Systems ~ Two Tension Rope System (TTRS) Raise and Lower Two-Tensioned Rope System – Raise A Two-Tensioned Rope System shares the load between two ropes, both under tension. Each system is capable of functioning as both mainline or back-up to the other line. System System Benefits Maestro • load is distributed between two …

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Ascenders and Clamps Technical Tips: How to calculate mechanical advantage

©Petzl Technical Information ©Petzl How to calculate mechanical advantage A mechanical advantage haul system reduces the effort required to raise a load. The mechanical advantage obtained is based on the pulley effect. 1. The pulley effect If we consider a load suspended on a rope, the rope passing through a pulley above the user, with …

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How To Calculate Mechanical Advantage with Petzl Gear

A mechanical advantage haul system reduces the effort required to raise a load. The mechanical advantage obtained is based on the pulley effect.   1. The Pulley Effect If we consider a load suspended on a rope, the rope passing through a pulley above the user, with the user’s hand holding the rope on the …

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CMC MPD ~ Two Rope Offset ~ TTRS

CMC MPD ~ Two Rope Offset ~ TTRS The MPD allows you to go from lowering to raising without changing hardware. More than nine years of research and development went into the patented Multi-Purpose Device (MPD), which features major innovations in advanced technical hardware for rope rescue professionals. The MPD’s high-efficiency pulley, with an integral …

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Marginal Anchors | Anchor Considerations in Rope Rigging Systems Vol. 2

Marginal anchors in theory create a force out of many, but how should we present this diverse and sometimes controversial concept of anchor construction?  This is an introduction to multiple back-ties and projecting the power of substantial anchors to a single focal point. Marginal anchors are generally considered independent anchors points that would not support …

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Staggered Anchors: Progression from 3:1 to 9:1 Simple Mechanical Advantage

  Excerpt from Knots & Pulleys in Rope Rigging Systems Vol. 1 Segment 7 In continuing with the discussion about pulley systems this video reviews the 5 rules of simple pulley systems before delving into the principles of a 3:1 MA, mechanical advantage, and compounding a 3:1 system to a 9:1 using staggered anchors for …

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Rock Exotica Omni-Blocks: Gear Vault, An RRG Signet Series Presentation | Block and Tackle

Rock Exotica’s Omni-Block swivel pulleys combine a swivel with a pulley in a patented design that saves vertical height and lets you remove and install the rope while keeping the pulley attached to the anchor. These patented devices revolutionized pulley use when they were introduced in 2005. The Omni-Block combines a pulley with a swivel …

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Pulley system efficiency tests with Petzl Maestro, I’d S, Pro Traxion and RollClip

There can be a big difference between the theoretical efficiency of a pulley system and its actual efficiency. Here are test results from the Petzl lab. 1. Efficiency depending on the device used at the head of the system. The force required to raise a 100 kg mass was tested under several configurations with different …

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