About Lifting Blocks
Lifting blocks are assemblies that consist of a hook or shackle, swivel, bearing, sheaves, sprockets, pins and frame. They are suspended by a hoisting rope or load chain and are designed for a variety of lifting applications. Lifting blocks often use eye hooks, clevis hooks, or grab hooks for connections to other lifting and rigging hardware. Lifting block shackles are U-shaped pieces of metal with a pin or bolt across the opening, or hinged metal loops that are secured with a quick-release locking mechanism. Lifting block swivels permit torsional rotation along one or more planes. Many types of bearings are also used with lifting blocks. Lifting block sheaves are grooved wheels or pulleys that, when used with a rope or chain, change the direction and point of application of pulling force. Lifting block sprockets are designed to transmit power by means of a toothed wheel whose teeth engage the links of the chain. Lifting block pins are of several different types. Choices include toggle, clevis, coiled, dowel, grooved, hinge, knurled, rolled, shear, spring, straight, taper or tension pins. The frames of lifting blocks are typically made of metal materials.
Selecting lifting blocks requires an analysis of available product types and component specifications. Most suppliers of lifting blocks designate products by application or feature. Choices include cargo blocks, deck blocks, crane block, pulley blocks, and bottom blocks. Parameters for lifting block shackles include pin or bolt diameter, hole diameter, width at eyes, width at bow, width between eyes, inside length, inside width at bow, outside diameter (OD) of eye, approximate weight, and estimated weight per hundred. Working load limit (WLL) is an important performance specification to consider. Lifting block bearing parameters include bearing type, bore size, OD, and ratings from the American National Standards Institute (ANSI), Anti-Friction Bearing Manufacturers Association (AFBMA) and/or the Annual Bearing Engineers Committee (ABEC). Lifting block sheaves carry specifications such as sheave length and height, maximum cable OD, maximum sheave OD, minimum bending radius, maximum sheave width, shaft diameter, maximum line tension, and pulling radius. Important parameters to consider when searching for lifting block sprockets are number of teeth, bore diameter, hub diameter, OD, length through bore, and weight.
Other Topics You Might Be Interested In
-
Engine Block
Handling Description: Transfer blocks from an inbound conveyor or pallet to an outbound conveyor. Problem: Existing below the hook tooling used to unload blocks from a pallet was not able to unload...(read more)
Engineering Web: Lifting Blocks
Pages: 1 - 3 of 117
|
Arcan Press V-Blocks — For 20- To 50-Ton... Arcan Press V-Blocks ? For 20- To 50-Ton Press, Model# PPMVB02 Professional-grade, precision matched V-blocks work in any Arcan 20- to 50-ton press. See Northern Tool + Equipment Information |
|
|
Bottom Blocks Home > Bottom Blocks Bottom Blocks David Round supplies both standard and custom engineered bottom blocks. See David Round Profile & Catalog |
|
|
Blocks Blocks Popular Blocks Sections: Lifting Equipment |
