CRANES 



755 



Balance Weights 



Hoisting 

 Jigger 



Compensating Pulley 



Luffing Rani 



Level Hook 



\ 



A 



Compensating Pulley 



FIG. 372. Hydraulic Balanced-Jib Luffing Crane. 



is luffed inwards the hoisting rope is paid out to compensate for the rise 

 at the point of the jib. By suitably adjusting the stroke of the luffing 

 ram and the inclination of the rods the level of the lifting hook may be 

 maintained constant for all radial positions of the weight. 



3 c 2 



