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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 "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 ...
Stothert & Pitt crane with Toplis gear. An early form of level-luffing gear was the "Toplis" design, invented by a Stothert & Pitt engineer in 1914. [2] [3] The crane jibs luffs as for a conventional crane, with the end of the jib rising and falling. The crane's hook is kept level by automatically paying out enough extra cable to compensate for ...
Jib (crane) or jib arm, the horizontal or near-horizontal beam used in many types of crane; Jib (camera), a boom device with a camera on one end; Jib door, a concealed door, whose surface reflects the moldings and finishes of the wall
Fairbairn's patent curved platework jib Maker's plate for Stothert & Pitt. This photograph also shows the distinctive double rows of rivets that make up 'chain riveting.' The crane's innovation was in the use of a curved jib, made of riveted wrought iron platework to form a square-section box girder.
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 ...
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 two cranes were the first modern high capacity cranes in Britain. [5] Other shipbuilders installed massive cranes soon after, such as the Titan Clydebank in 1907, although these were typically British-built and of a different design. [6] The crane was erected in 1903 at a cost of £3,352 by German firm Kohncke. [5]