While distance is no impediment for this type of crane, an underhung crane
cannot lift a load as high as a top-running crane system and is meant for loads of 15 tons or less.
The Monorail Manufacturers Association (MMA), a subsidiary of Material Handling Industry of America (MHIA), sponsored the standards in the interest of improved uniformity of patented rack and enclosed track underhung crane
and monorail performance and public safety.
Single-girder underhung crane
has bridge end trucks running on lower flanges of runway beams.
The only other alternative--which Caterpillar contemplated bringing over from one of its other buildings--was an underhung crane
. Requiring a 25-ft-wide corridor overhead, the crane would have mandated clearing out all the tubes and pipes coming down from the ceiling.
facility, hand-held transmitters are used to control the main bay that contains a five-ton underhung crane
in the 75-ft by 150-ft shop and a 10-ton crane outside in the 500-ft yard.
The hand-held radio transmitters are used to control the companies' main bay, 5-ton underhung crane
in the 75-by 150-ft shop and a 10-ton crane outside in the 500-ft yard.
Typical standard crane systems currently available include: overhead cranes with single or double girder design; underhung cranes
including low headroom design; jib cranes; cranes with in-line mechanically linked synchronised hoists; cranes with parallel operating hoists; crane capacities up to 100 tonnes; crane operation spans up to 36 metres.
Capacity of both single- and double-girder underhung cranes
are less than the top-running ones.
A section on monorails and underhung cranes
reviews the major components of these systems, including rails, under-running trolleys, interlock devices, and track suspension.
Specifications for underhung cranes
and monorail systems
On the assembly line, Demag's KBK underhung cranes
provide mobile support of air tools as workers walk along with each chassis as it moves along the floor by towline.