Glossary


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1) Overhead travelling 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.

2) Top running crane

An electric overhead traveling crane having the end trucks supported on rails attached to the top of the crane runways.

3) Single girder crane

An overhead traveling crane that utilizes a single bridge beam attached to the two runway/end trucks.  This bridge beam or single girder supports a lifting mechanism or hoist that "runs" on the bottom flange of the bridge beam.

4) Underhung crane

An electric overhead traveling crane having the end trucks supported on track attached to the bottom flanges of the beam; or supported on bottom flanges of beams.  These beams make up the crane runway.

5) Under running crane

An electric overhead traveling crane having the end trucks supported on track attached to the bottom flanges of the beam; or supported on bottom flanges of beams.  These beams make up the crane runway.

6) Double leg gantry

An overhead traveling crane designed so that the bridge carrying the trolley or trolleys is rigidly supported on two or more legs moving on fixed rails embedded in the floor (via end trucks attached to the bottom of each leg) or on wheels.

7) Truss girder crane

An overhead traveling crane designed with structurally reinforced bridge girders to allow greater span and loading capabilities.  The reinforcement consists of utilization of trusses extended vertically and horizontally from the load bearing beam(s) of the crane bridge.

8) 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.

9) Crane Manufacturers

As applies to Members of the Material Handling Industry of America (MHIA), this term usually applies to manufacturers of overhead traveling cranes, jib cranes, stacker cranes, and gantry cranes to the exclusion of mobile cranes, tower cranes or devices otherwise referred to as construction cranes.

10) 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.

11) Festoon

A configuration of small trolleys, support track, and electirical cable utilized to provide power to material handling devices while keeping the power cable out of harm's way.  The cable is looped or "festooned" by attaching to trolleys supported on a track. Thsi arrangment allows this cable to be "bunched" in an accordian-like fashion so as to keep the cable from becoming entangled in the movement pattern of the device it serves. Often utilized to "stretch" cable across the bridge of an overhead traveling crane.

12) I-beam crane

An overhead traveling bridge crane that utilizes standard I-beam (S beams) as the bridge girder and at times also utilizes I beams as the runway beams.  Cranes that utilize H-beams (structural beams) as girder and runways are sometimes referred to as I-beam cranes as opposed to patented track cranes.

13) Double girder crane

An overhead traveling bridge crane that utilizes two bridge beams set atop the runway (end) trucks.  Generally this type of crane utilizes a top running trolley hoist which moves along the top of the two bridge beams on its own set of trucks/trolley wheels.  The hook from the hoist "falls" between the two bridge beams.  Headroom under the crane is increased by utilizing this hoist/crane configuration.