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Sheerlegs mounted on an M32 tank recovery vehicle. Shear legs, also known as sheers, shears, or sheer legs, are a form of two-legged lifting device.Shear legs may be permanent, formed of a solid A-frame and supports, as commonly seen on land and the floating sheerleg, or temporary, as aboard a vessel lacking a fixed crane or derrick.
On the top side, the two legs are connected together by a lashing but with a small spacer block placed between the legs. A sling, which may be made from ropes, is placed around the area that two legs meet to be used to put a tackle pulley system for lifting the load. There are two guy wires, front and rear, to support the shear legs.
Left Coast Lifter is a floating derrick barge or sheerleg which was built to assist in the eastern span replacement of the San Francisco–Oakland Bay Bridge.The barge carries a shear legs crane which is the largest barge crane ever used on the U.S. West Coast.
1600 ton maximum lift capacity sheerleg Taklift 7 of Smit International. A floating sheerleg (also: shearleg) is a floating water vessel with a crane built on shear legs. Unlike other types of crane vessel, it is not capable of rotating its crane independently of its hull. There is a huge variety in sheerleg capacity.
A Sheer-legs barge is a barge with sheer-legs mounted at one end, which can lift loads and luff the sheer-legs to adjust the reach, but cannot swing the load independently of the hull orientation. A typical arrangement has a substantial A-frame hinged at the stern, supported by stays to the bow.
Shear legs are hoisting a timber. Below, the sticks on the log are winding sticks used to align the ends of a timber. Tools used in traditional timber framing date back thousands of years. Similar tools are used in many cultures, but the shapes vary and some are pulled rather than pushed.
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A gin pole used to install a weather vane atop the 200-foot steeple of a church Roof trusses being assembled with gin poles. The gin pole is derived from a gyn, and considered a form of derrick, called a standing derrick or pole derrick, [2] distinguished from sheers (or shear legs) by having a single boom rather than a two-legged one.