Used Potain Tower Cranes Seattle

There are several commercial and industrial buildings that now exceed 60 stories or more. These buildings all need tall cranes to be able to help move the supplies to the upper floors. There are cranes which have their own vehicle connected or other kinds which are operated from the rear of trucks. Tower cranes are the largest kinds available on the market.

Tower cranes are the stand-alone structures that are often seen on high-rise building projects. Usually, they are part of a major city's downtown skyline. Wherever new construction like for instance apartment buildings and skyscrapers and commercial facilities such as shopping center are being constructed, chances are a crane would be on site.

Types

The two key kinds of cranes could be differentiated by the way in which their boom or jib lifts supplies. The jib is the metal frame which extends from the main section. On a flat tower crane, the jib remains horizontal when it carries items. On a luffing kind of tower crane, the jib could ratchet to downward or upward angles. The lifting capacity for both kinds can range from 30,000 lbs. to 10,000 lbs.

Body

The body of the crane is composed of a mast. This is a vertical steel frame which is a combination of individual parts. In order to increase the overall height of the equipment, sections are added. The mast extends upward to where the desired height is, to the control module, which is a small room that has glass windows on all four sides or to the tower as it is also referred to. The driver of the crane works from inside of the tower.

Lift

The crane uses a braided metal cord to raise materials. This cord extends out from a motor situated next to the control module to the end of the jib or boom. There is a pulley system located at the end of the jib, through which the cord is positioned and lowered down. The jib which holds the cord becomes balanced by a counter jib located on the opposite side of the tower. The counter jib has weights. These weights help to prevent the crane from tipping over when heavy supplies are lifted.

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