A hoist is a device used for lifting or lowering a load 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 medium. 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. The lifting medium is either wire rope, wrapped around a drum, or load-chain, raised by a pulley with a special profile 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 common use since the 1800s, however mass production of an electric hoist did not start until the early 1900s and was first adapted by Germany. A hoist can be built as one integral-package unit, designed for cost-effective purchasing and moderate use, or it can be built as a built-up custom unit, designed for durability and performance. The built-up hoist will be much more expensive, but will also be easier to repair and more durable. Package units were once regarded as being designed for light to moderate usage, but since the 60s this has changed. Built-up units are designed for heavy to severe service, but over the years that market has decreased in size since the advent of the more durable 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 durability, performance, and repairability 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.
A device is usually a constructed tool, but may refer more specifically to:
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Device was an industrial metal band started by David Draiman, frontman of the heavy metal group Disturbed. Draiman was approached by Geno Lenardo, former guitarist of Filter, and together they started to work on new material. The two started work on a debut album in June 2012. The result of those sessions, Device, was released on April 9, 2013. The first single and third track, "Vilify" was released to radio ahead of the album on February 19, 2013, alongside its first music video, directed by P. R. Brown. The second single and the introductory track, "You Think You Know", was released on June 11, 2013, alongside its music video, directed once again by Brown.
After Disturbed went into hiatus in late 2011, frontman David Draiman announced a new side-project called Device in May 2012. He revealed that he would be working with Geno Lenardo, former guitarist for Filter for their Title of Record and Amalgamut albums, in the new sideproject. Draiman revealed his intention to do a project with more of an electronic sound, but in an industrial metal type way, sounding similar to Nine Inch Nails or Ministry, not dubstep.
Device is the fourth and last studio album released by Eon on August 1, 2006 through Fiberlineaudio.com.
Hoist may refer to:
In underground mining a hoist or winder is used to raise and lower conveyances within the mine shaft. Modern hoists are normally powered using electric motors, historically with direct current drives utilizing solid-state converters (thyristors), however modern large hoists use alternating current drives that are variable frequency controlled. There are three principal types of hoists used in mining applications:
Drum hoists are the most common type of hoist used in North America, South Africa and South America. When using a drum hoist the hoisting cable is wound around the drum when the conveyance is lifted. Single-drum hoists can be used in smaller applications, however double-drum hoists easily allow the hoisting of two conveyances in balance (i.e. one skip being lifted while a second skip is being lowered). Drum hoists are mounted on concrete within a hoistroom, the hoisting ropes run from the drum, up to the top of the headframe, over a sheave wheel and down where they connect to the conveyance (cage or skip).