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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.
The Fire Department of New York purchased two Sutphen 100+ tower ladder quints in 1981. They were the tallest tower ladders in the city [15] until they were taken out of service. Aerialscope only sold 75 foot towers until they developed 95 foot versions in 1985. The patch of Ladder 119 in Brooklyn still has an image of their Sutphen.
On 4 April 2007, Samson collided with the long jib of smaller rail-mounted "Henson" tower crane, sending the smaller crane tumbling to the ground. The smaller crane weighed 95 tonnes and stood at a height of 25 metres (82 ft), compared to Samson's 106 metres (348 ft).
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 gin pole in use loading logs A gin pole used to install a weather vane atop the 200-foot steeple of a church Roof trusses being assembled with gin poles. A gin pole is a mast supported by one or more guy-wires that uses a pulley or block and tackle mounted on its upper end to lift loads.
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.
Greek siege tower first used in Rhodes. [5] Polybolos: 289 BC Greece: A siege engine with torsion mechanism, drawing its power from twisted sinew-bundles. Sambuca: 213 BC Sicily: Roman seaborne siege engine build on two ships. Siege hook: 189 BC Rome: A siege hook is a weapon used to pull stones from a wall during a siege.
A vehicle used by GIGN featuring a mechanical assault ladder mounted on its roof, essentially a modern version of a siege tower. In modern warfare, some vehicles used by police tactical units, counterterrorists, and special forces can be fitted with mechanical assault ladders with ramps. These are essentially modernized siege towers with ...