A hoist is a device used for lifting or lowering a consignment by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting channel. The load is attached to the hoist by means of a lifting hook. The basic hoist has two important characteristics to define it: Lifting medium and power type.
Types of Hoists
Single Girder Amsak Hoists
Single Girder Hoists are manufactured at Amsak’s modern-day manufacturing facility and offer clienteles the finest in technology. Amsak Cranes offers electrically operated Single Girder wire rope hoists.
Double Girder Amsak Hoists
Double Girder Hoists from Amsak Cranes can be fitted on all EOT, Gantry or Under Slung cranes providing innovative engineering solutions for clienteles.
Electric Wire Rope Hoists
The electric wire rope hoists lifts up heavy load by coiling the rope around the drum, powered by an electric motor to make the work of lifting heavy consignments easily.
Electric Chain Hoists
Amsak chain hoists are designed for flexibility and durability in industrial applications and demanding workstation use. With a load range from 60 kg to 5,000 kg, they are extremely versatile.
The lifting medium is either wire rope, wrapped around a drum, or load-chain, elevated by a pulley with a special silhouette to engage the chain. The power can be provided by different means. Common means are hydraulics, electrical and air driven motors. Both the wire rope hoist and chain hoist have been in everyday use since the 1800s, however mass production of an electric hoist did not lead until the early 1900s and was first amended by Germany.
A hoist can be built as single integral-package unit, designed for cost-effective procuring and sensible use, or it can be built as a built-up custom unit, designed for stability and performance. The built-up hoist will be much more expensive, but will also be easier to repair and more hardwearing. Package units were once regarded as being intended for light to adequate usage, but since the 60s this has changed. Built-up units are designed for heavy to stern service, but over the years that market has reduced in size since the introduction of the more hardwearing packaged hoist.
A machine shop or fabricating shop will use an integral-package hoist, while a Steel Mill or NASA would use a built-up unit to meet robustness, performance, and reparability requirements. NASA has also seen a change in the use of package hoists. The NASA Astronaut training pool, for example, utilizes cranes with packaged hoists.