When is a pulley not a pulley?

Answer : when there are more than 2 and then they become a block and tackle.

Block and tackle pulley system consists of more than one block with rope, are termed tackle.
A single Pulley

 

A single pulley is seldom used on its own, generally several of them are used in the commonly known ‘block and tackle’ systems, an individual pulley being a block and, in an assembly of more than one block with rope or cable threaded through, they are termed tackle.

The more pulleys that are used in the block and tackle system, the easier it becomes to lighten the load.

There are, of course, several types of blocks available:

  • Stainless steel blocks which have the great advantage of long life and virtually no maintenance
  • Ball bearing blocks which give low friction and maximize the load bearing performance
  • High capacity blocks used when strength is of paramount importance
  • Block and tackle pulley system consists of more than one block with rope, are termed tackle.Special purpose blocks, e.g. those that can be permanently mounted within walls
  • Snatch blocks, used to ‘snatch’ some of the load as they can be inserted anywhere along the load-bearing cable/rope without having to remove the load to re-thread the cable/rope
  • Blocks manufactured from different materials for different uses

It would be very difficult to imagine how life would be without the invention of the age-old block and tackle!

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Blocks and Tackles – Pulley Systems for Dummies

Safety Systems for all purpose.
Blocks and Pulleys

Just about everyone has seen a crane working at a building site, but have you noticed its attached mechanisms? (Its block tackle & pulley systems ) If you look carefully you’ll notice there’s a block and tackle, an indispensable piece of equipment which can be seen in numerous places and for numerous uses.

Block & Tackle

A block and tackle is a system where several pulleys, or blocks, are joined together with ropes, belts or chains to raise or move heavy weights, the word ‘pulley’ has become synonymous with the word ‘block’.

Different block and tackle systems are used according to the weight they are required to lift, working out the tackle needed requires some degree of mathematical ability but in simple terms, for those who dislike maths, it’s all to do with what is termed ‘mechanical advantage’.

If we imagine someone drawing water from a well the mechanical advantage is the ratio of the force produced, i.e. the power to lift a full bucket of water, to the force applied to it, i.e. the effort put into the lifting which, without the pulley, would only have been enough for half a bucketful.

For more the various tackles with their mechanical advantages please visit us.

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How to set up an Outrigger | Ronstan Industrial

Ronstan provide a range of specialist fittings which can be used for some of the key elements of outriggers. A great addition to fisherman’s boat are outriggers as they enable them to increase their total  catch.

An outrigger is usually positioned rigidly to the main hull but as with most boating equipment, there are several types of outriggers and the mounts that they sit on.

How to install your outrigger

Depends on which mounting option you have gone for, but there are a few tips that should be followed when mounting any outrigger. Firstly all mounts should be through bolted, Outriggers are a great addition to any fisherman’s boatpreferably with stainless steel and additional backing plates. Secondly you need to carefully consider placement, to make sure that you have adequate access to the outrigger components as needed. Thirdly, do not use poles that are disproportionately heavy for their intended usage – pick the lightest possible for your boat and desired set up.

When setting up your outrigger you need to ensure that the end where the line attaches is at the right height. If set too high or two low you can run into problems. The ends of the poles should be about four to five meters above sea level for optimum usage. That is, an angle of setting up your outrigger you need to ensure that the end where the line attaches is at the right height.around 30-40 degrees from the horizontal marker. It is important to remember however that the further the lines run, the more the tow angle is reduced. A reduced angle doesn’t help the lure’s action but can be improved by lifting the tow point by running it from the outrigger out to sea.

Make sure you have the right components, and someone to help you, and setting up your outrigger should be pretty simple or if in doubt your local fishing shop or your boat supplier should be able to recommend the most appropriate set up.

Ronstan provide a range of specialist fittings which can be used for some of the key elements of outriggers. This includes our blocks and shackles.

Contact us for more Information: https://www.ronstanindustrial.com/


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Working Loads vs Breaking Loads

Rigging Pulleys - Industrial Hardware - RonstanUnderstanding the safety factors of the equipment you are working with is paramount no matter the industry you are working in. With this, it is important to comprehend the differences between working loads, and breaking loads – which may sound the same, but they are not. Any configuration of equipment is only as strong as its weakest, or lowest rated parts. Both terms are a form of rating.

The term working load limit, is most frequently used in rigging terminology, it was the cornerstone of engineering for many years. It is the breaking load of a component divided by an appropriate factor of safety – a safe load that was the maximum carrying capacity. The terms usually apply to equipment such as hooks, slings, shackles and the like.

The working load, sometimes also known as the safety working load, or normal working load (just to confuse things further) is the mass that the equipment being used can safely hold, lift, or lower without there being a fear of breaking. In shorter terms; the maximum load that can be applied to the product safely when in general service. This is most accurate when the product is new and without any ware. This is measured on a straight line pull only, and side pulling can produce different results. It is also important to make sure that all components in a system have the same working load limit.

block tackle pulley system - Industrial Hardware - RonstanThe breaking load also can be known as the rated capacity. This measure is the force that the piece of equipment breaks when tested at as opposed to measure of mass it can hold. Force is consistently applied at a uniform rate of speed to ascertain the breaking load. The breaking load, or breaking strength as it is also called, is a vital part of the calculation of the working load limit.

The working load is one fifth of the minimum breaking strength. The tests which are undertaken in the laboratory are testing under normal environment type conditions and so when using in adverse weathers or other settings that may include different chemical levels, this should be taken into consideration.

Blocks and Tackle - WorkingAtHeight - Industrial Hardware - RonstanThe working load limit of any piece of equipment must never be exceeded, and components must be properly matched. As logic would suggest, it is best to avoid heavy impact shock loads, or any abstract movement such as winging or jerking. Anything like this can lead to stress on the product which leads to the breaking strength and the working load limit being exceeded causing the wider mechanism to fail.

If you need advice on the right products for your safety equipment please contact us. 

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