hoist

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hoist:

see winchwinch,
mechanical device for hauling or lifting consisting essentially of a movable drum around which a cable is wound so that rotation of the drum produces a drawing force at the end of the cable.
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Hoist

A projecting beam with block and tackle, used for lifting goods; often seen above openings in the upper stories of medieval houses. Also, a platform for lifting people and/or materials. The platform is lifted by cables and contained within an open frame that is supported by the building.

Hoist

 

a cyclical or continuous-operation machine for lifting freight and passengers in special carrying devices that move along rigid vertical (sometimes inclined) guides or rails. A distinction is made among cable, chain, rack, screw, and plunger hoists, depending on the way in which the driving force is transmitted to the carriers.

A predominant position is occupied by cable hoists, in which the carrier is lifted on steel cables that pass around cable sheaves or are wound around the drums of hoisting winches. In hoists with cable sheaves, which transmit the tractive force by friction, the carrier (a cab, cage, skip, platform, trolley, or car) is balanced by another similar carrier or by a counterweight that also moves along guides. In drum hoists a counterweight reduces the load on the drive. When additional load-lifting equipment is used for balancing, the efficiency of the hoist is increased. Hoists usually have an electric drive, and sometimes a hydraulic drive.

The diversity of designs and types of hoisting machinery results from the broad sphere of application of such devices. Elevators, escalators, and occasionally paternosters have become commonplace in residential, public, administrative, and industrial buildings. Funiculars, or passenger cable hoists that operate cyclically, are used to lift passengers in cars along an inclined railway on mountains, steep banks, and other natural eminences.

Skip hoists are used to raise useful minerals and barren rock to the surface in mines, pits, and quarries, and also to charge blast furnaces. In underground mining, cage hoists are installed to raise and lower personnel, equipment, and materials. Buildings are erected with the aid of pillar, cable, and shaft construction hoists; the pressure (delivery) pipes for high-mountain hydroelectric power plants are assembled by special trolley hoists. Various types of hoists are used in maintenance plants (for example, automobile lifts) and for the servicing and minor repair of buildings, gas holders, and other high structures (for example, cherry pickers). (The Russian term, pod”emnik, is also applied to the equipment for lifting ships traveling through canals having different water levels.)

REFERENCES

Kifer, L. G., and I. I. Abramovich. Gruzopod”emnye mashiny, vol. 2. Moscow, 1949.
Pod”emniki. Moscow, 1957.
Fedorova, Z. M., and I. F. Lukin. Pod”emniki: Konstruirovanie i raschet elementovpod”emnika. Kharkov, 1971.

N. A. LOBOV

hoist

[hȯist]
(mechanical engineering)
To move or lift something by a rope-and-pulley device.
A power unit for a hoisting machine, designed to lift from a position directly above the load and therefore mounted to facilitate mobile service. Also known as winding engine.

hoist

1. In building, a machine for lifting workers and materials to upper stories during erection of the structure.
2. A machine that provides power drive to a cable drum used to pull or lift a load.

hoist

hoist
In helicopters, the mechanism by which external loads (personnel or equipment) may be raised or lowered vertically. The term also is used as a verb, meaning “to pull up loads and personnel with the hoist/winch.”

hoist

1. any apparatus or device for hoisting
2. Nautical
a. the amidships height of a sail bent to the yard with which it is hoisted
b. the difference between the set and lowered positions of this yard
3. Nautical the length of the luff of a fore-and-aft sail
4. Nautical a group of signal flags
References in periodicals archive ?
About Hoists Direct LLC - Hoists Direct, based in Albemarle, N.
Thanks to its 360[degrees] rotation, 7 m height and use of a Verlinde Eurobloc VT electric wire rope hoist, the crane can be used for loading and unloading goods and equipment, or for lifting vessels out of the water for maintenance purposes.
Do you have the in-house skills and resources to keep the hoist at its optimum level?
Most of Alimak's construction hoists are based on modular designs, which provide flexibility in both size and capacity for use in a variety of applications, including construction and refurbishment of high-rise buildings, bridges, chimneys and facades.
The utility said it only learned after the failure of the second motor hoist that incorporating the motor hoists installed by Advanced American into MWH's engineering design was "part of a systemic design error" because they couldn't "safely and reliably drive the roughly 200,000 pound roll gates on the Leaburg Dam facility without catastrophic failure," according to the lawsuit.
Hoists designed for higher or lower load limits, together with products capable of operating at depths greater than 70 meters could also be manufactured if required.
Gwent Coroner David Bowen said he would be writing to the city council which installed the hoist urging it to issue emergency call buttons to disabled people using such systems without carers.
The changes in this version reflect the experience gained by the industry using the original guidance; and it incorporates lessons learnt during investigations into lever hoist incidents over the last five years," explains IMCA's Technical Director, Jane Bugler.
The hoist is equipped with two-speed motors, and features, "Plug and Lift" connections.
MacIsaac says construction activity stands to pick up over the six months before the hoists arrive, with much electrical work to be done and more concrete to pour.
DISABLED swimmers will be able to take the plunge now a Rugby leisure centre has invested in a poolside hoist.
ABB has been awarded a contract for the design, supply and installation of two complete mine hoist systems at Outokumpu Chrome's Kemi mine.