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A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load.
A traveling block is the freely moving section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite (and under) the crown block (the stationary section).
At the other extreme, when r is zero, the system becomes a simple gun tackle with a mechanical advantage of 2. Comparison of a differential pulley (left) and a differential windlass or Chinese windlass (right). The rope of the windlass is depicted as spirals for clarity, but is more likely helices with axes perpendicular to the image.
In sailing, a block is a single or multiple pulley. One or a number of sheaves are enclosed in an assembly between cheeks or chocks. In use, a block is fixed to the end of a line, to a spar, or to a surface. A line (rope) is reeved through the sheaves, and maybe through one or more matching blocks at some far end, to make up a tackle.
It provides a ton of space, can carry heavy cargo, and features an advanced entertainment and driver-assistance system. This car can perform well, is fuel efficient and offers hybrid options.
A winch weighed 665 lb (302 kg) and added 15 + 1 ⁄ 2 in (39 cm) inches to the length of the truck. The M815 had a mid-mounted winch and the M816 had a rear-mounted 45,000 lb (20,000 kg) capacity winch. [9] A standard military cab, designed by REO for their 2 + 1 ⁄ 2-ton M35, was used. It had hinged doors with roll-up windows, a folding ...