Compact hoists work in confined spaces

Based on a concept of two driving mechanisms instead of four, the EH 50 mono-rail hoists are compact enough to operate in areas where heavy loads have to be lifted in confined spaces.

Monorail hoists from J D Neuhaus can be used for a diverse range of applications, as highlighted by a special version of its popular EH 50 model, which has been supplied to a US marine shipyard for the handling and manipulation of ship segments.

With handling safety of paramount importance at shipyards, the specified hoist had to be able to handle 60 tons even though the nominal load would only be 46 tons.

The EH 50 unit (with a nominal capacity of 50 tons) proved to be the ideal solution as it had 25% overload rating, effectively increasing this to 62.5 tons.

Based on a concept of two driving mechanisms instead of four, the EH 50 hoists are compact enough to operate in areas where heavy loads have to be lifted in confined spaces.

Thanks to the use of compressed air as the driving medium, the robust hoists can also be used in hazardous areas where there is the potential of explosion.

If the area is particularly high risk, the units can also be delivered with additional protection against metallic sparking.

At the shipyard in the US, the EH 50 hoist travels on a long I-section beam with A-supports.

Among the special features for this particular project was a 'Rams' hook with shackle bore mounted at the end of the hoist.

Another specific customer requirement was to have the travelling motors of the EH 50 offer a free running mechanism when lifting the load, as many of the ship segments are not sufficiently balanced.

The solution engineered by J D Neuhaus allows the operator (using the control pendant) to open the brakes of the driving motors once the hoist is parked over the segment load.

Once lifting commences the EH 50 will move itself above the centre of gravity to allow a safe lifting operation.

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