Welded L-iron used for making column, arm and rafter Hinge attachment on upper part column for the rafters and multiple tackle supporting the arm The bottom of the column is joined to the winch the pivot fitted to this rotates on a special thrust bearing. The arm and hook can be raised or lowered simultaneously or independently Electro hydraulic provided brakes. Swivel steel pulleys on sealed roller bearing with ground steel pins. Block with steel pulleys and single or double hook (with anchor) rotating on a thrust bearing. A winch unit electric motors drive the gear speed reducers. These are case hardened, tempered and rotated in an oil bath. derrick cranes manufacturers, jib cranes manufacturers

Welded L-iron used for making column, arm and rafter Hinge attachment on upper part column for the rafters and multiple tackle supporting the arm The bottom of the column is joined to the winch the pivot fitted to this rotates on a special thrust bearing. The arm and hook can be raised or lowered simultaneously or independently Electro hydraulic provided brakes. Swivel steel pulleys on sealed roller bearing with ground steel pins. Block with steel pulleys and single or double hook (with anchor) rotating on a thrust bearing. A winch unit electric motors drive the gear speed reducers. These are case hardened, tempered and rotated in an oil bath. derrick cranes manufacturers, jib cranes manufacturers