Glossary


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31) Air chain hoist

A pneumatically driven machinery unit, utilizing chain as its lifting medium, and used for the lifting and lowering of a freely suspended (unguided)load.  Often used in environments that require electric spark avoidance due to a potentially explosive atmosphere.

32) Air wire rope hoist

A pneumatically driven machinery unit, utilizing wire rope as its lifting medium, and used for the lifting and lowering of a freely suspended (unguided) load.  Often used in environments that require electric spark avoidance due to a potentially explosive atmosphere.

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) Hoist Manufacturers Institute (HMI) Industry Group

The Hoist Manufacturers Institute (HMI) members are the Industry’s leading suppliers of hoisting equipment including hand chain hoists, ratchet lever hoists, trolleys, air chain hoist, air wire rope hoists, electric chain hoists, and electric wire manufacturing and distribution sector.

35) 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.

36) Top running crane

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

37) 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.

38) 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.

39) 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).

40) Enclosed track

A track section, usually in a rectangular tube shape, that possesses a continuous slot running lengthwise along the underside of the section.  This slot permits carriers and end trucks to travel on the interior bottom flange of the track section.

41) Industrial crane

A machine for lifting and lowering a load, and moving it horizontally.  Drives may be manual, power, or a combination of both and utilized totally in an industrial environment.

42) Gear motor

A commonly used term that designates a hoist that derives its lifting and lowering power from a mechanical setup involving a gear set and pneumatic or electric motor.

43) Chain hoist

Generally, any hoist which utilizes link or roller chain as its lifting medium.  Chain hoists can be manually operated  (hand or lever), pneumatically driven, or electrically driven.

44) Type III pallet

Double-faced, flush-stringer or block, reversible pallet.

45) Dock face

The outside wall of the dock door area.