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Level Luffing Crane
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. 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. Level-luffing is most important when careful movement of a load near ground level is required, such as in construction or shipbuilding. This partially explains the popularity of fixed horizontal jibs in these fields. Toplis cable luffing An early form of level-luffing gear was the "Toplis" design, invented by a Stothert & Pitt engineer in 1914. 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 this. This is also a purely mechanical linkage, arranged by the reeving of the hoist cables to the jib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Crane Double-lever-jib-type 3D Animated
Crane or cranes may refer to: Common meanings * Crane (bird), a large, long-necked bird * Crane (machine), industrial machinery for lifting ** Crane (rail), a crane suited for use on railroads People and fictional characters * Crane (surname), including a list of people and fictional characters with the surname * Crane (given name), a list of people Places Barbados * The Crane, Saint Philip, Barbados United Kingdom * River Crane, Dorset * River Crane, London, a small river of London, branch to the Thames ** Crane (ward), an former electoral ward of Hillingdon London Borough Council that existed from 1978 to 2002 United States * Crane, Indiana, a town * Crane, Missouri, a town * Crane, Montana, a census-designated place and unincorporated community * Crane, Oregon, a census-designated place and unincorporated community * Crane County, Texas ** Crane, Texas, a city and the county seat * Crane, Virginia, an unincorporated community * Crane, Washington, an unincorporated community ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
