Glossary


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1) Lifting capacity

The rated load of a material handling lifting device (i.e., scissors lift, hoist) applied as uniformly distributed load.

2) Stacker crane

The stacker crane in appearance looks like a conventional bridge crane except that in place of a hoist, a rotating ridged or telescoping mast is suspended from the bridge trolley with the mast equipped with a load handling device such as single or double forks or a grab. These cranes can be manually operated or powered and are used where the carne spans multiple aisles allowing for the storage and retrieval within any aisle of items such as coils of steel.

3) Clamp

A below-the-hook attaching device which, using a jaw-like scissor gripping action, clamps or locks onto a piece of material. This device is attached to the hook of a hoist or the end effector of a manipulator and usually is used to pick up sheets of material such as wood or metal.

4) Nets

A basic form of below-the-hook lifting attachment which is suspended from a hoist or other lifting mechanism and simply wraps around the object to be moved and lifts it totally. Mesh netting is also used for securing loads to pallets.

5) Hoist Manufacturers Institute

The Hoist Manufacturer's Institute, an affiliate of Material Handling Industry, is a trade association of manufacturers of overhead handling hoists.  The products of its member companies include hand chain hoists, ratchet lever hoists, trolleys, air chain and air rope hoists, and electric chain and electric wire rope hoists.    Hoist Manufacturers Institute 8720 Red Oak Blvd., Suite 201 Charlotte, NC 28217    Phone:  704-676-1199  Fax: (704) 676-1199 Hal Vandiver, Managing Director hvandiver@mhia.org

6) Manual hoist

A suspended machinery unit that, by use of manual operation, is used for lifting and lowering of a freely suspended (unguided) load.  Generally uses chain (roller or link) as its lifting medium

7) Lever hoist

A lever operated manual device used to lift. lower, or pull a load and to apply or release tension.  Utilizes a ratchet and pawl mechanical configuration to incrementally raise or lower a load or to apply or release tension.

8) Strap hoist

A lever operated manual device, utilizing polyester or nylon straps as the lifting medium, used to lift, lower, or pull a load and to apply or release tension.

9) Pneumatic hoist

A motor driven hoist whose power is derived from pneumatically powered motors.  These hoist are often used in areas where electrical sparks are undesirable due to the possibility of explosion of fumes or materials.

10) Electric overhead crane

A crane with a single or multiple girder (bridge girder) bridge carrying a movable or fixed hoisting mechanism and traveling on an overhead fixed runway structure with all or most movements powered by electric motors.

11) Box girder crane

An overhead traveling crane that utilizes a "box" configuration in fabricating the bridge girder.  This box girder design incorporates a four-sided box with a running surface plate for the hoist trolley attached to the bottom of the box.  The advantage of the box girder is that it possesses greater loading capabilities and is able to span greater bridge distances. Generally utilized in pairs with the hoisting mechanism operating on rails attached to the top of each box girder.

12) Wall traveling jib crane

A traveling jib crane consisting of a fixed or moveable hoisting mechanism and operating on a runway attached to the side walls or columns of a building.

13) Work station crane

An overhead crane generally used for ergonomic purposes and consisting of bridge(s) and runways made from enclosed metal track.  End trucks attached to the bridge girder allow for ease of movement. The entire system is designed to allow workers to move loads by hand pushing the load with the assistance of a vertical lifting device such as a hoist or vacuum lifter.

14) Push type crane

An overhead traveling crane whose horizontal travel is powered manually or by the operator.  Often work station cranes are push type cranes.  This crane may or may not utilize powered hoist or lifting mechanisms.

15) Fixed Aisle Storage & Retrieval

Fixed Aisle (F/A) Storage & Retrieval Systems consist of one or more long, narrow aisles framed on both sides by a steel (and sometime extruded aluminum) storage rack structure into and from which loads are automatically stored and retrieved under computer control. The storage/retrieval function in each aisle can be performed a variety of ways.  However, the most  common was is by a machine that consists of a floor running, traveling structural frame or vertical mast that guides and supports a hoisting carriage on which loads are carried. One or more shuttles or insertion/extraction devices on the hosted carriage manipulates loads into and out of adjacent or opposing storage rack positions. All three machine motions; horizontal (down aisle), vertical and shuttle action are independently and automatically controlled. See also Carousels , Unit Load AS/RS , Mini-Load AS/RS and/or Micro Load AS/RS .