Glossary


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31) 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.

32) Crane Manufacturers Association of America (CMAA) Industry Group

CMAA is the Crane Manufacturers Association of America, Inc., an independent trade association affiliated with the Material Handling Industry. CMAA traces its roots to the Electric Overhead Crane Institute, known as EOCI, which was founded in 1927 by leading crane manufacturers of that time to promote the standardization of cranes as well as uniform quality and performance. The voluntary association was incorporated as the Crane Manufacturers Association of America, Inc. in 1955. Member Companies, representing the industry leaders in the overhead crane industry, serve the United States market from operations based in the United States, Canada, and Mexico.

33) Hand trolley

A trolley or carrier, generally suspended from a monorail or crane bridge, that is capable or designed to be propelled manually.  A push-pull trolley.

34) Electrification

The track mounted conductor system by which the moving equipment receives its electrical power. All of the electrical components that go into providing power to an electric overhead crane or jib crane.  These components may include power bar, collectors, collector rings, pendent stations, and tagline/festooning.

35) Data transmission

The use of sensors to transmit data via pulse-modulated light beam systems typically from host stations to mobile carriers such as AGV's or stacker cranes.

36) Pendant station

Also referred to as a "pushbutton station".  An electrical control device consisting of pushbutton-operated contacts in an enclosure used by the operator for control of the powered motions of the crane, hoist and other auxiliary equipment.

37) Carrier

Also known as a trolley.  A unit that travels on the bottom flange of a monorail or patented track beam, jib crane or bridge girder to transport a load. Also refers to a trucking line used to transport materials to and from a distribution center.

38) 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.

39) Monorail Manufacturers Association, Inc. (MMA) Industry Group

Founded in 1933, The Monorail Manufacturers Association, Inc. (MMA) is an independent incorporated trade association affiliated with the Material Handling Industry. MMA Members produce the preponderance of patented and enclosed track underhung cranes and monorail systems.

40) Pallet lifter

A below-the-hook lifting device that utilizes forks in its design and serves to take the role of forklift forks while utilizing the capabilities of a crane and/or hoist.  Generally, counterweighted at its top and attached via a bail and hook arrangement.

41) CMAA

The Crane Manufacturers Association of America, Inc. (CMAA) , an independent trade association affiliated with the United States Division of Material Handling Industry. The voluntary association of CMAA members has existed since 1955. Member companies represent industry leaders in the overhead crane market. Contact: CMAA 8720 Red Oak Blvd., Suite 201 Charlotte, NC 28217 Phone: (704) 676-1190  Fax: (704) 676-1199 Hal Vandiver, Managing Director hvandiver@mhia.org

42) Lifting beam

A solid or fabricated metal or wooden beam, suspended from a hoist/crane or from forks of a forklift, designed to provide multiple lifting points.  The lifting beam enables the user to attach the load at more than one point therein securing and controlling the load's movement.

43) Vacuum lifter

A lifting device utilizing the creation of vacuum to attach itself to an object via the use of an electric-powered extraction pump and sealed pads. Generally suspended from a hoist/crane, manipulator, balancer, or positioner.  Often attaches to the lifting mechanism by means of a bail and hook arrangement or is an integral part of the positioning and lifting mechanism.

44) Tagline

An electrical conductor system employing flexible cables which are festooned along the bridge or runway.  The cable is attached to trolleys or hooks which operate on a rigid bar or tight wire along the entire bridge width or runway length.  This arrangement serves to keep the cables "out of the way" of the crane and hoist movement.

45) Patented track

A generic term referring to crane and monorail equipment built in accordance with the MMA specification utilizing a composite track section incorporating a proprietary bottom flange shape. A monorail track beam fabricated from a "T" section and a running flange.  Patented track is characterized by the "hardness" of its load bearing surface and the ability to be bent into curves without deformation of the beam's load bearing surface.  The name "patented track" derived from the original patent received by the inventor for the fabrication  and production process of the beam(s).