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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.
An A-frame is a basic structure designed to bear a load in a lightweight economical manner. The simplest form of an A-frame is two similarly sized beams , arranged in an angle of 45 degrees or less, attached at the top, like an uppercase letter 'A'.
Headframe of the #1 Shaft at Oyuu Tolgoi. A steel headframe is less expensive than a concrete headframe; the tallest steel headframe measures 87 m. [4] Steel headframes are more adaptable to modifications (making any construction errors easier to remedy), and are considerably lighter, requiring less substantial foundations.
A forklift (also called industrial truck, lift truck, jitney, hi-lo, fork truck, fork hoist, and forklift truck) is a powered industrial truck used to lift and move materials over short distances. The forklift was developed in the early 20th century by various companies, including Clark , which made transmissions , and Yale & Towne ...
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
To protect the hoist(s) and winches and the sensitive electronics which are used to control their operation they are normally installed inside a build called a hoist (or winder) house. Commissioning Sinking Set-Up. The Sinking set-up must then be commissioned to ensure that all parts are operating as planned. Full Sink. The activities of the ...
The hydraulic operating pressure of all hooklift hoists are preset at the factory to achieve the intended lifting capacity for the design application. The original approach used by early European models, still widely used today, was a high pressure / low volume system.
The Universal Hallen derrick, replacing the D-Frame option, is a kind of traditional topping lift. The Hallen D-Frame is a steel bracket welded on the mast in the centerline. For an observer standing a beam, the frame has a "D"-shape. The D-Frame supersedes the outriggers and provides a good controlling angle on the guys.