Ad
related to: luffing crane vs towermachinerytrader.com has been visited by 10K+ users in the past month
Search results
Results from the WOW.Com Content Network
A level-luffing crane is a crane mechanism where the hook remains at the same level while luffing: moving the jib up and down, so as to move the hook inwards and outwards relative to the base. [ 1 ] Usually the description is only applied to those with a luffing jib that have some additional mechanism applied to keep the hook level when luffing.
This specific example uses a level luffing mechanism to maintain the load at approximately the same vertical height as the jib moves through its range of travel. A jib or jib arm is the horizontal or near-horizontal beam used in many types of crane to support the load clear of the main support. [1] [2] An archaic spelling is gib. [3]
A tower crane is usually assembled by a telescopic jib (mobile) crane of greater reach (also see "self-erecting crane" below) and in the case of tower cranes that have risen while constructing very tall skyscrapers, a smaller crane (or derrick) will often be lifted to the roof of the completed tower to dismantle the tower crane afterwards ...
Level luffing crane, a type of crane where the jib, rather than being fixed, can be raised and lowered; Luffing, when a sailing sheet is eased so far past trim that airflow over the surface is disrupted; The leading edge of a sail
It was a luffing-jib tower crane manufactured by Favco that was 200 feet (61 m) tall at the time of the collapse. The accident occurred when workers were attaching a new steel collar to anchor it to the building at the 18th floor, as part of an operation to extend the crane upwards. [6]
Dumping the grab contents into the hopper now only requires the quicker luffing movement, without needing to slew for each load. The term "kangaroo crane" has also been applied more recently to jumping cranes, tower cranes used in the construction of skyscrapers that are capable of raising their towers as construction grows upwards.
Crane The tower crane (see picture) is a modern form of balance crane that is fixed to the ground. A horizontal boom is balanced asymmetrically across the top of the tower. The long arm carries the lifting gear. The short arm is called the machinery arm; this holds the motors and electronics to operate the crane, as well as the concrete ...
Chebyshev linkages did not receive widespread usage in steam engines, [citation needed] but are commonly used as the 'Horse head' design of level luffing crane.In this application the approximate straight movement is translated away from the line's midpoint, but it is still essentially the same mechanism.
Ad
related to: luffing crane vs towermachinerytrader.com has been visited by 10K+ users in the past month