5 Ton Stahl Crab – Refurbished This unit is Avava Condition: Refurbished Price £2,300 For full details Please contact Industrial… Read More
A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which a wire rope or chain is wrapped. Some hoists are manually operated or pneumatically driven there are also many electric hoists. All of these however may use chain or fibre wire rope as its lifting medium. The load is attached to a hoist using a lifting hook.
A basic hoist has two important characteristics which define it; the lifting medium and power type. The lifting medium will be either a wire rope (wire rope hoists), wrapped around a drum, or load-chain (chain hoists), raised by a pulley with a special profile to engage the chain. The power type can be either electric motor or air motor. Both the wire rope hoist and chain hoist have been in common use since the 1800s. Hoists can be built as one integral-package unit, which are designed for cost-effective purchasing and moderate use. Alternatively, they can be made as a custom-built unit, which are designed for durability and performance.
A construction hoist is made up of either one or two cars which travel vertically along stacked mast tower sections. The mast sections are attached to the structure or building every 25 feet for added stability. For precisely controlled travel along the mast sections, modern construction hoists use a motorized rack-and-pinion system that climbs the mast sections at various speeds.