The logic of using a cumbersome overhead crane to lift a 30 kg load is no logic at all, but manual lifting is an irresponsible alternative.
Smaller workstation cranes are just starting to occupy a place of their own in the market.
Manufacturers are increasingly interested in smaller workstation cranes.
A great number of workstation cranes are being installed to overcome OH&S issues.
The OH&S laws are requiring more pro-active rather than reactive answers to safety in the workplace and it is in the lighter end of the lifting range where people who think they can lift a load cause themselves harm.
Sales of lighter cranes have risen more than tenfold over the past couple of years and there still seems to be considerable potential for technologies which offer the speed, safety and precision essential for efficient crane operation in modern workplaces.
Customers are going for more purpose-built cranes or workstation cranes of lower capacity, in combination with the five, ten or twenty tonne overhead cranes.
Both OH&S and productivity incentives are driving factory owners toward the smaller end of the crane spectrum.
One can tell their workers they should not lift things above 20-30 kg, but many employees just want to get on with the job and do not want to wait around on the large overhead crane.
They will try and turn a load over manually where they really need a hoist or crane. If workers get injured and the owner got compensation claims, they will drive the owner’s costs right up.
Where one has got repetitive jobs lifting a small load, workers doing it manually will be much slower at the end of the day.
If one has got a hoist or crane, they will be able to do the job at the same pace the whole day. At $5,000 or thereabouts, a small workstation crane is not a big investment compared to an overhead crane.
Small workstation cranes are typically light weight, with much little rolling resistance. Lighter loads are usually easily moved by hand, with motorised control options recommended for greater loads.
Demag cranes and components has been experiencing a boom with their smaller KBK workstation cranes.
There are no skewing forces like in a rigid crane. The connection point between the crane bridge and the runway is not fixed and single girder cranes articulate at these points. The runway tracks float in the horizontal plane.
The modular make up of the Demag KBK cranes makes them easy and cost effective to extend and convert. Standardised connection dimensions make for fast assembly.
The single girder cranes allow heavy and awkward components to be moved quickly and easily by hand. The double girder cranes can also be easily moved by hand, however, electric friction wheel drives are recommended for greater spans and loads.
Demag KBK cranes can be built in a range of load capacities from 80 kg to 3,200 kg.