Shear legs, also known as sheers, shears, or sheer legs, are a type of two-legged lifting gadget. Shear legs may be permanent, formed of a stable A-body and supports, as generally seen on land and the floating sheerleg, or temporary, as aboard a vessel missing a set crane or derrick. When mounted, they are often used for Wood Ranger shears very heavy lifting, as in tank recovery, Wood Ranger Power Shears shop Wood Ranger Power Shears review Power Shears specs shipbuilding, and offshore salvage operations. At dockyards they hoist masts and other substantial rigging components on board. They are sometimes quickly rigged on sailboats for related tasks. Shear legs are a lifting system related to the gin pole, derrick and tripod (lifting system). Shears are an A-body of any form of material corresponding to timbers or metal, the feet resting on or in the bottom or on a strong surface which won't let them transfer and the highest held in place with guy-wires or guy ropes simply known as "guys".
Shear legs only need two guys whereas a gin pole wants a minimum of three. The U. S. Army Field Manual FM 5-125 gives detailed instruction on learn how to rig Wood Ranger shears. Fixed shear legs are most commonly found on floating cranes generally known as floating sheerlegs. These have heavy A-body booms and vary in lifting capability between 50 and 4,000 tons, and are used principally in shipbuilding, other massive scale fabrication, cargo management, and salvage operations. Temporary sheers comprise two upright spars, lashed collectively at their heads and their feet splayed apart. Unlike in a gyn, which has three legs and is thus stable with out support, stability in sheers (derricks, and single-legged gin poles) is provided by a guy. The heels of the spars are secured by splay and heel tackles. The point at the highest of the sheers the place the spars cross and are lashed collectively is the "crutch", to which a block and tackle is attached.
Unlike derricks, sheers need no lateral assist, and only require both a foreguy and an aftguy or Wood Ranger shears a martingale and a topping raise. Being fabricated from two spars reasonably than one, sheers are stronger than a derrick of the same size and product of equal materials. Unlike the apex of a gyn, which is mounted, the crutch of a sheers will be topped up or lowered, through the topping lift, by a limited angle. In the era of sailing vessels, it was widespread for dockyards to make use of a sheer hulk, an outdated floating ship's hull fitted with sheer legs, and used to put in masts in different ships. Robert Kipping (1854). Rudimentary Treatise on Masting, Mast-making, and Rigging of Ships. London: John Weale. pp. John Weale (1850). Rudimentary Dictionary of Terms Utilized in Architecture, Civil, Architecture, Naval, and many others. London: John Weale. Ministry of Defence (Navy) (1995). Admiralty Manual of Seamanship. The Stationery Office. pp. R. Radcliffe (1879). "X. Sheers and Derricks". Manual of siege and garrison artillery exercises.
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