A overhead crane always moves in 3 directions:
Length, the length of the runway.
Width, the width of a building or bay.
Height, the vertical distance for the hook moving up and down.
Simply a overhead crane consists of three parts: bridge, trolley, and hoist
The part of the crane moving the length is called the Bridge.
The part of the crane moving the width is called the Trolley.
The part of the crane moving the height is called the Hoist.
Bay: The space between the building frames measured parallel to the ridge of the building.
Beam: An overhead standard structural or specially fabricated shape of bridge, on which the trolley operates and is supported by the end trucks. Also called girder
Box section: The rectangular cross section of girders, trucks or other members enclosed on four sides.
Brake: A device, other than a motor, used for retarding or stopping motion by friction or power means.
Bridge: a part of an overhead crane consisting of beams, trucks, walkway and drive mechanism which carries the trolley and travels the length of the runway.
Building Aisle: A space defined by the length of a building and the space between building columns.
Capacity: the Maximum rated load (in tons) which a crane is designed to handle.
Collectors: Contacting devices for collecting current from the runway conductors. The mainline collectors are mounted on the bridge to transmit electrical current from the runway conductors.
Electric Overhead Traveling Crane: EOT crane in short, an electrically operated machine for lifting, lowering and transporting loads, consisting of a movable bridge carrying a fixed or movable hoisting mechanism and traveling on an overhead runway structure.
Hoist: a Machinery unit that is used for lifting and lowering a load.
Holding Brake: a brake that automatically prevents motion when the power is off.
Lift: The maximum safe vertical distance through which the hook can move.
Limit Switch: A device designed to cut off the power automatically at or near the limit of travel for the crane motion.
Pendant Pushbutton Station: Means suspended from the crane for operating the controllers from the floor or other level beneath the crane.
Rated load: The maximum load a crane is designed to handle.
Remote Operated Crane: a crane controlled by Radio Remote Controls.
Runway: The rails, beams, brackets, and framework on which a crane operates.
Runway Beam: A horizontal beam attached to the building columns or wall, and supporting a runway rail on which the crane travels
Runway Conductors: the main conductors mounted on or parallel to the runway which supply electrical current to the crane.
Runway Rail: The rail supported by the runway beams on which the bridge travels.
Single Girder Cranes: An electric overhead traveling crane having one main girder which supports a hoist mounted on a under running trolley.
Span: The horizontal distance center-to-center of runway rails.
End Stop: A device to limit travel of a trolley or crane bridge. This device normally is attached to a fixed structure and normally does not have energy absorbing ability.
End Truck: An assembly consisting of the frame and wheels which support the crane girder(s) and allow movement along the runway.
Support Column: A separate column which supports the runway beam of a top running crane.
Suspension System: The system (rigid or flexible) used to suspend the runway beams of underhung or monorail cranes from the rafter of the building frames.
Top Running Crane: An electric overhead traveling crane having the end trucks supported on rails attached to the top of the crane runway beams.
Trolley: A wheeled mechanism from which a hoist is suspended to provide horizontal motion of the hoist along a beam.
Trolley Speed: The rate of motion that a motor operated trolley (and hoist) attains while traveling along a beam.
Under Running Crane: An electric overhead crane having the end trucks supported on track attached to the bottom flanges of beams or supported on the bottom flanges of the beams; these beams make up the crane runway.
Wheel Base: The distance from center-to-center of outermost wheels.
Wheel Load: The load without impact on any wheel with the trolley and lifted load (rated capacity) positioned on the bridge to give maximum loading.