Crane Services Ltd

Overhead Cranes come in four basic configurations.

Top Running – The Crane bridge travels on top of rails mounted on a Gantry Beam supported by either the building columns or support columns specifically engineered for the crane.

Under-slung – The Crane Bridge travels on the bottom flange of the gantry beams which are usually supported by the roof structure or a 'Goal-Post' structure. 

Single Girder (S/G) – The Crane consists of two end carriages, a single bridge girder and the hoist unit.   The hoist carriage runs on the bottom flange of the bridge girder.

Double Girder (D/G) – The Crane consists of two end carriages, two bridge girders and the crab unit (which includes the hoist mechanism).   The crab runs on rails on top of the girders.   A variation on these types of overhead crane are 'Goliath' cranes.   These cranes are essentially the same as the standard overhead cranes, however the bridge girder(s) are connected to 'legs' on either side of the span.   These 'legs' eliminate the supporting gantry and column system and connect to the end carriages which run on a rail either embedded in, or laid on top of the floor.

Travelling Hoist -    In the case of a monorail system a Travelling Hoist unit similar to the one used on single girder cranes is mounted on a beam which might be used to service an assembly line within the clients facility.   Other clients may have an existing single or double girder crane bridge and may just want to replace the unit.   In most of these situations, capacity permitting, we can provide either a wire rope or chain hoist.   Another solution which may fit your needs is a Jib Crane.   A Jib Crane basically consists of a slewing beam which is supported as a cantilever on a support column.   A Travelling Hoist is fitted to the slewing beam.