China Cheap price 2 Ton Crane Hoist - Mini Manual Chain Hoist HSZ-M – Hardlift

The ultra-light premium class mini chain hoist. Holds more than 100 times its own weight! (With standard lifting height)

The drop forged suspension and load hooks, that yield under overload instead of breaking, are made from non-aging, high tensile alloy steel

Extended application range due to wide hook opening

Affordable mini chain hoist for light assembly work

Fits in every toolbox

Sturdy sheet-steel casing

The word “hoist” is used to describe many different types of equipment that lift and lower loads.  For example, many people use “hoist” to describe an elevator.  The information contained here pertains specially to overhead, construction and mine hoist.  

Overhead

Overhead hoists are defined in the American Society of Mechanical Engineers (ASME) B30  standards as a machinery unit that is used for lifting or lowering a freely suspended (unguided) load.  These units are typically used in an industrial setting and may be part of an overhead crane.   

A specific overhead hoist configuration is usually defined by the lifting medium, operation and suspension.  The lifting medium is the type of component used to transmit and cause the vertical motion and includes wire rope, chain or synthetic strap, or rope.  The operation defines the type of power used to operate the hoisting motion and includes manual power, electric power, hydraulic power or air power.  The suspension defines the type of mounting method used to suspend the hoist and includes hook, clevis, lug, trolley, deck, base, wall or ceiling.

The most commonly used overhead hoist is electrical powered with wire rope or chain as the lifting medium. Both wire rope and chain hoist have been in common use since the 1800s, however mass production of electric hoists did not start until the early 1900s and was first adapted by Germany.  A hoist can be a serial production unit or a custom unit.  Serial production hoists are typically more cost-effective and designed for a ten-year life in a light to heavy hoist duty service classification.  Custom hoists are typically more expensive and are designed for a heavy to severe hoist duty service classification.  Serial production hoists were once regarded as being designed for light to moderate hoist duty service classifications, but since the 60′s this has changed. Over the years the custom hoist market has decreased in size with the advent of the more durable serial production hoists. A machine shop or fabricating shop will typically use a serial production hoist, while a steel mill or NASA may typically use a custom hoist to meet durability and performance requirements.          

When selecting an overhead hoist, several application parameters must be considered.  These are the average operating time per day, load spectrum, starts per hour, operating period and equipment life.  These parameters determine the Hoist Duty Service Classification, and are further defined in the document “Comparison of Hoist Duty Service Classifications” to help hoist installers and users better understand the hoist’s useful life and duty service application.

[This article is quoted from Wikipedia. Please let us know if there is any infringement]