wire rope blocks and sheaves quotation

For over 60 years, Loos & Co., Inc. has pioneered and thrived in the highly critical profession of wire, wire rope, and hardware manufacturing for use in applications critical outcomes are directly at stake. This valuable experience has taught us “the ropes” about what a difference quality and performance make in your applications. Now, we can help make the difference for you with your pulley and sheave applications, too.

We’re proud to offer a wide variety of military specification and commercial wire rope, aircraft cable, and fittings to compliment your complete sheaves or pulley system. These products are the perfect compliment to the high performance products offered by esheaves.com. Pairing Loos & Co., Inc. tools, hardware, and accessories with the highest quality pulleys and sheaves will repay you with the performance you have come to expect from our products.

Esheaves offers the Wire Rope sheave solution to tackle any challenge you face. From strength, to availability, to like -for- like replacement, there is no heavy duty sheave application we can’t assist you with. If you need assistance selecting the best solution for your project, contact us directly to speak to a member of our knowledgeable engineering staff.

VER Sales is your complete source for Rigging, Chain, Nicopress Tools & Sleeves, Fall Protection, Turnkey Engineered Systems, Custom Cable Assemblies, Bungee Cord, Bungee Assemblies, Safety Supplies, and much more.

At Bear Equipment Inc. we pride ourselves on our many years of customer service, same day quotations, quick and on time delivery along with providing a quality product at a competitive price.

3″ Swivel Hook pulley block, industrial quality, forged hook, triple 7/16 wide machined sheave; oil impregnated bushing grooved for 1/4″ wire ropes; locking nuts and bolts; Clear zinc finish; safe work load of 800 lbs; weight 3.20 lbs. Optional steel latch available.

4″ Swivel Hook pulley block, industrial quality, forged hook, double 5/8 inch machined sheave; oil impregnated bushing grooved for 3/8″ wire ropes. Clear zinc finish; safe work load of 1700 lbs; weight 6.20 lbs.

One side of the Yale pulley blocks is hinged and can be opened for easy and quick positioning of the wire rope on the sheave. It can also provide a quick and versatile rigging point or redirect a wire rope.

Sheave blocks for wire ropes can be used in various combinations to increase the lifting or pulling capacity. It should be noted that when rope blocks are used, the load imposed on the supporting structure is increased by the value of the hoisting effort, as well as on the equipment that is used to connect the top hook or eye of the pulley blocks to the structure. There must be a deal of care taken to ensure that the structure, along with all of the hook equipment (trolleys, beams, clamps, etc), is of adequate capacity.

We offer Sheave Pulley Block, which allow quick and easy load redirection or multiplication of the maximum load capacity. The sheave pulley block is composed of a wheel and a groove between two flanges around the wheel"s edge. One rope, cable, belt or chain mainly runs inside the grooves. Designed in line with internationalread more...

Suburban, Mumbai Malti Devi Shukla Chawl, Ground Floor, Krishna Galli Malpa Hill No-1, Near W. E Highway, Andheri east, Suburban, Mumbai - 400093, Dist. Mumbai, Maharashtra

Prem Nagar Industrial Area, Jalandhar Opposite Mubarakpur, Shekhe Industrial Estate, Near Onkar Bus Service, Old Hoshiarpur Road,, Prem Nagar Industrial Area, Jalandhar - 144025, Dist. Jalandhar, Punjab

We are one of the esteemed names engaged in wholesaling, retailing, trading and supplying high quality Double Sheave Pulley Block that is manufactured by vendors using premium quality raw material and advanced production techniques. To ensure its compliance with the industry norms, our experts conduct vigorous quality check asread more...

We present highly durable quality Double Sheave Pulley Block to our prestigious customers which is manufactured by ISO certified companies using high-quality raw material and advanced production techniques. Apart from the assured quality of the sheave, hook and rope, it is widely appreciated for user friendly applications,read more...

We offer Sheave Pulley Block, which allow quick and easy load redirection or multiplication of the maximum load capacity. The sheave pulley block is composed of a wheel and a groove between two flanges around the wheel"s edge. One rope, cable, belt or chain mainly runs inside the grooves. Designed in line with internationalread more...

* Ultimate Load is 4 times the Working Load Limit. ** Ultimate Load is 3.5 times the Working Load Limit. † Fitted with 1-1/4″ ID Swivel Eye. ‡ Special Dual Groove Sheave also accepts 1-1/4″ Manilla Rope.

The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load. The rope is threaded through the pulleys to provide mechanical advantage that amplifies the force applied to the rope.

Hero of Alexandria described cranes formed from assemblies of pulleys in the first century. Illustrated versions of Hero"s Mechanica (a book on raising heavy weights) show early block and tackle systems.

A block is a set of pulleys or sheaves mounted on a single frame. An assembly of blocks with a rope threaded through the pulleys is called tackle. The process of threading ropes or cables through blocks is called "reeving", and a threaded block and tackle is said to have been "rove".boats and sailing ships, where tasks are often performed manually, as well as on cranes and drilling rigs, where once rove, the tasks are performed by heavy equipment.

Note that the gun tackle, double tackle and threefold purchase all have the same number of pulleys in both blocks (one, two and three, respectively) whereas the Luff tackle and Gyn tackle have mis-matched blocks with differing numbers of pulleys.

A gun tackle has a single pulley in both the fixed and moving blocks with 2 rope parts (n) supporting the load (FB) of 100 N. The mechanical advantage is 2, requiring a force of only 50 N to lift the load.

A block and tackle is characterized by the use of a single continuous rope to transmit a tension force around one or more pulleys to lift or move a load. Its mechanical advantage is the number of parts of the rope that act on the load. The mechanical advantage of a tackle dictates how much easier it is to haul or lift the load.

If frictional losses are neglected, the mechanical advantage of a block and tackle is equal to the number of parts in the line that either attach to or run through the moving blocks—in other words, the number of supporting rope sections.

Consider the set of pulleys that form the moving block and the parts of the rope that support this block. If there are n of these parts of the rope supporting the load FB, then a force balance on the moving block shows that the tension in each of the parts of the rope must be FB/n. This means the input force on the rope is FA=FB/n. Thus, the block and tackle reduces the input force by the factor n.

A double tackle has two pulleys in both the fixed and moving blocks with four rope parts (n) supporting the load (FB) of 100 N. The mechanical advantage is 4, requiring a force of only 25 N to lift the load.

Ideal mechanical advantage correlates directly with velocity ratio. The velocity ratio of a tackle is the ratio between the velocity of the hauling line to that of the hauled load. A line with a mechanical advantage of 4 has a velocity ratio of 4:1. In other words, to raise a load at 1 metre per second, the hauling part of the rope must be pulled at 4 metres per second. Therefore, the mechanical advantage of a double tackle is 4.

The mechanical advantage of any tackle can be increased by interchanging the fixed and moving blocks so the rope is attached to the moving block and the rope is pulled in the direction of the lifted load. In this case the block and tackle is said to be "rove to advantage."

"Rove to advantage" – where the pull on the rope is in the same direction as that in which the load is to be moved. The hauling part is pulled from the moving block.

"Rove to disadvantage" – where the pull on the rope is in the opposite direction to that in which the load is to be moved. The hauling part is pulled from the fixed block.

Diagram 3: The gun tackle "rove to advantage" has the rope attached to the moving pulley. The tension in the rope is W/3 yielding an advantage of three.

The decision of which to use depends on pragmatic considerations for the total ergonomics of working with a particular situation. Reeving to advantage is the most efficient use of equipment and resources. For example, if the load is to be hauled parallel to the ground, reeving to advantage enables the pulling force to be in the direction of the load movement, allowing obstacles to be managed more easily.

The increased force produced by a tackle is offset by both the increased length of rope needed and the friction in the system. In order to raise a block and tackle with a mechanical advantage of 6 a distance of 1 metre, it is necessary to pull 6 metres of rope through the blocks. Frictional losses also mean there is a practical point at which the benefit of adding a further sheave is offset by the incremental increase in friction which would require additional force to be applied in order to lift the load. Too much friction may result in the tackle not allowing the load to be released easily,

Open blocks have a space wide enough between the fixed cheeks to be able to slide the pulley over the rope. These can be extremely small and light while retaining significant strength due to the lack of moving parts.

A swing cheek block is a special kind of block which can be opened to engage with a bight, without the necessity to thread the rope through the block or remove the load from the end of the rope. The snatch block is also the load lifting pulley in certain arrangements, such as during use in a recovery operation.

Swing cheek pulleys: used for light loads or redirection of forces, usually with a single pulley wheel (though multiple sheaves/cheeks are not uncommon) and an attachment point (or several) for a carabiner or sling. The cheeks are not fixed or locked in position aside from the device used to secure them to the load or rigging point.

Examples of use (in an arborocultural setting) include: tail minding/tending, and for setting a rigging point in the tree above the cut to take place - a positive rigging situation.

Snatch or Impact Blocks: used for heavier loads and more dynamic rigging, the cheeks of these blocks are fixed in place with a pin which locks into the opposite cheek. This pin may form part of the axle for a second pulley, which is secured to the load or rigging point with a soft sling, rather than a solid device such as a shackle. This allows for more even distribution of forces to the faces where the forces will be applied, as opposed to a carabiner or shackle, where the forces are applied more strongly to corners and edges, increasing risk of deformation or damage.

Friction may mean that the rope in a tackle "bunches" and jams when the force is released if the tackle has too much friction for the load to balance, or that the tackle does not "lower" the load

MacDonald, Joseph A (14 January 2009). Handbook of Rigging: For Construction and Industrial Operations. McGraw-Hill Professional. p. 376. ISBN 978-0-07-149301-7. Tackle may be rigged to advantage - where the pull on the rope is in the same direction as that in which the load is to be moved; or it may be rigged to disadvantage - where the pull on the rope is in the opposite direction of that in which the load is to be moved

Sheaves Canada"s Vertical Blocks and Horizontal Blocks are of the highest quality. Rigid and built to last, our lead blocks are sure to provde the execptional performance required for your rigging application.

Lead blocks are used to redirect the path of the wire rope. The lead block may be used to avoid obstacles, increase safety, and assist in hoisting where fleet angle may be a challenge.

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