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It has been in use mainly in single-speed, hub-geared, or other bicycle drivetrain systems with straight chainlines or widely spaced sprockets. In this assembly, the outside plate with the two pins protruding from it are spaced at the same pitch as the chain at 12.7 mm (0.50 in), and the free ends of the pins are grooved.
Rigging comes from rig, to set up or prepare. Rigging is the equipment such as wire rope, turnbuckles, clevis, jacks used with cranes and other lifting equipment [1] in material handling and structure relocation. Rigging systems commonly include shackles, master links and slings, and lifting bags in underwater lifting.
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.
The base of the tower is hinged and the top of the tower is connected to a pulley system for load lifting. As this is a simple derrick system, it is recommended for use by some agencies as an improvised rescue derrick in an emergency situation where no suitable rescue derrick or crane is available. [1] [2]
High lead logging is a method of cable logging using a spar, yarder and loader. It was developed by Oscar Wirkkala.It is accomplished with two lines (cables) and two winches (or cable drums).
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