tower crane

Crane used on construction sites with a usually horizontal jib mounted on top of a tower.

counterjib

Metal lattice that supports the ballast.

operator’s cab

Cab at the top of the tower from which the operator manipulates the crane.

tower mast

Metal lattice of varying height that supports the jib.

counterweight

Blocks of concrete stacked at the base of the tower to stabilize the crane.

crane runway

Girders along and under which the trolley runs.

hook

Strong curved piece of metal for suspending the load.

hoisting block

System of pulleys that work with the trolley pulley to improve leverage to lift heavy loads.

hoisting rope

Durable cable of variable length for manipulating loads.

trolley pulley

System of several pulleys that together enhance leverage.

jib

Metal lattice that pivots on the tower and lifts and extends the hoisting system.

trolley

Vehicle running along and under the jib; the hoisting rope is suspended from it.

jib tie

Metal cable that distributes the tension.

counterjib ballast

Concrete mass attached to the counterjib to balance the weight of the jib and its load.