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This specific example uses a level luffing mechanism to maintain the load at approximately the same vertical height as the jib moves through its range of travel. 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]
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.
The proper name Γεράνα is a modified spelling of γέρανος, which is the Ancient Greek word for crane. [2] It derives from the Proto-Indo-European root *gerh 2-en-/-eu-, meaning the same thing; cognate with the English word 'crane.' [3] It seems to be attested in Mycenaean Greek in the dative plural form gerenai (Linear B: 𐀐𐀩𐀙𐀂, ke-re-na-i), though Beekes expressed some ...
Konecranes originated within the Finnish Kone Corporation. Its history traces back to 1933 when Kone embarked on the production of Electric Overhead Traveling Cranes. In 1988 the crane business was combined into the KONE Cranes Division. [7] KONE Cranes Division remained an integral component of Kone until the year 1994.
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 ...
In 1881, Stothert and Pitt constructed a horizontal jib crane for Sir John Coode's harbour building work on the Kowie River at Port Alfred in South Africa. [6] This was a rail-mounted steam crane, with a fixed horizontal jib carrying a movable trolley or 'crab'. The crane, including the steam plant, could slew on a central king post bearing ...
A ring crane is a form of large construction crane with a luffing jib. It is distinguished by its slew pivot [i] being in the form of a ring-shaped track, rather than a narrow central spindle. The broad base this gives to the slewing section above allows it to slew whilst carrying extremely heavy loads. Ring cranes are rare.
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