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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.
The "hammerhead", or giant cantilever, crane is a fixed-jib crane consisting of a steel-braced tower on which revolves a large, horizontal, double cantilever; the forward part of this cantilever or jib carries the lifting trolley, the jib is extended backwards in order to form a support for the machinery and counterbalancing weight. In addition ...
Jib crane. Cranes are used to transport loads over variable (horizontal and vertical) paths within a restricted area and when there is insufficient (or intermittent) flow volume such that the use of a conveyor cannot be justified. Cranes provide more flexibility in movement than conveyors because the loads handled can be more varied with ...
BREM-80U (BREM-80) – Armoured recovery vehicle (ARV) based on the T-80U, with a large superstructure on the forward half of the chassis, a large square-section 18-tonne crane on the left side of hull and 35-tonne winch (in contrast to earlier Soviet ARVs which had light jib cranes). [6] BTU-80 – Dozer vehicle based on T-80. [6]
An overhead crane, commonly called a bridge crane, is a type of crane found in industrial environments. An overhead crane consists of two parallel rails seated on longitudinal I-beams attached to opposite steel columns by means of brackets. The traveling bridge spans the gap. A hoist, the lifting component of a crane, travels along the bridge.
Boat suspended from Welin Quadrant davits; the boat is mechanically 'swung out' HMS Victory in the 19th century, showing her boats suspended from wooden davits Gravity multi-pivot on cruiseferry Scandinavia Gravity Roller Davit Gravity multi-pivot davit holding rescue vessel on North Sea ferry Freefall lifeboat on the Spring Aeolian Frapping line Labeled Tricing Gripe Steps to launch davit ...
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 Noordzeekanaal from 1865 to 1876 used a variety of cranes, including two significant examples of the Hercules type.