This design has a different approach all together to design 1 and some may consider it to be more 'simple' . It consists of 4 main legs which will be adjustable with 2 rollers on the upper struts which will roll backwards and forwards in the x direction. There will be 2 winches, one to move the rollers in the x direction and one to move the pulley ( load ) in the y -direction. Andy is working on a sliding system for this design.
Advantages
The bending moments and stress analysis is simple to work out.
The legs are adjustable allowing them to reach places which are not each to get to .
There are no bearings involved which means there is less chance of failure within the crane .
No counterweights are needed for steadyness as the crane will be steady.
Disadvantages
Motion is limited. The load can only be transorted in a linear direction rather than at an angle as there are not bearings for rotation.
The cable can get caught with the winch.
As some legs would be shorter than others in certain situations, there can be a danger of tipping or the load sliding down at a faster speed.
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