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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: the jib, or operating arm, extends horizontally from the crane. A "luffing" jib is able to move up and down; a fixed jib has a rolling trolley car that runs along the underside to move loads horizontally. Counter jib: holds counterweights, hoist motor, hoist drum and the electronics. [65]
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.
Disadvantages of this crane type are the higher power demand and increased maintenance requirement due to the increased number of moving parts. Knuckle boom crane arms are much lighter than boom truck cranes, and they are designed to allow for more payloads to be carried on the back of the truck that it is mounted on.
In filmmaking and video production, a crane shot is a shot taken by a camera on a moving crane or jib. Filmmaker D. W. Griffith created the first crane for his 1916 epic film Intolerance , with famed special effects pioneer Eiji Tsuburaya later constructing the first iron camera crane which is still adapted worldwide today.
The crane could be used in a limited capability, although it was not until 1919 that replacement screws of sufficient quality were acquired. [1] Titan was completed on 3 December 1919. [2] On completion, the crane was handed over to the RAN. [3] Titan ' s cantilever-jib arm could reach 190 feet (58 m) above the surface at maximum extension. [4]
Most cranes utilize trolley-and-tracks for horizontal movement and hoists for vertical movement, although manipulators can be used if precise positioning of the load is required. The most common cranes include the jib, bridge, gantry, and stacker cranes.
A jib can be used for getting high or low shots which are difficult for a hand-held camera operator to get, or shots which need to move a short distance horizontally or vertically, without the expense and safety issues of putting a camera operator on a crane for a crane shot or laying track for a camera dolly. A jib can even be mounted on a ...
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