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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.
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] Usually jib arms are attached to a vertical mast or tower or sometimes to an inclined boom.
Jib crane. A jib crane is a type of crane - not to be confused with a crane rigged with a jib to extend its main boom - where a horizontal member (jib or boom), supporting a moveable hoist, is fixed to a wall or to a floor-mounted pillar. Jib cranes are used in industrial premises and on military vehicles.
Animation of main and jib boom articulation. Titan is a large self-propelled crane vessel with the tip of its main boom standing at 374 feet (114 m) above the typical water line and a lifting capacity of 385 short tons (349 t). [3] In 1957, it was claimed to be the largest floating crane in operation. [7]
This crane was worked by four men driving through a gear train of 632 times, which must have been hard and slow work at full capacity. As the capacity of the crane was so obviously limited by its motive power, not its strength, they were an obvious candidate for steam power – as was later re-applied to the 60 ton crane at Keysham.
The rest of the design continued the Manora type, with a lower frame of the crane which allowed blocks to pass through it on wagons. The crane was powered by a semi-portable steam engine in a small cabin at the rear of the jib, also helping as a counterweight. 1871 timber queen post truss jib, for the North Sea Canal. Construction of the Dutch ...
The crane can also be fitted with a small bucket and used as excavator arm, or with a pair of pincer-type grabbers (as pictured) for removing obstacles like trees. Its jib is telescopic, which when mobile gets retracted and placed onto a cradle on the rear of the hull, that in turn gets folded down against the engine deck when the crane is in use.
Another 78 full-scale production vehicles were delivered 1995–1997, 135 modernized T-72M1 tanks (made in the late 80s) were delivered between 1998 and 2002. Both new and modernized tanks have the same combat capabilities. [9] The Polish Army uses PT-91s in 3 variants– PT-91, PT-91MA and the PT-91MA1. [10]