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A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. The word ratchet is also used informally to refer to a ratcheting socket wrench.
Press tools are commonly used in hydraulic, pneumatic, and mechanical presses to produce the sheet metal components in large volumes. Generally press tools are categorized by the types of operation performed using the tool, such as blanking, piercing, bending, forming, forging, trimming etc.
A holding capstan is a ratchet device that can turn only in one direction; once a load is pulled into place in that direction, it can be held with a much smaller force. A powered capstan, also called a winch, rotates so that the applied tension is multiplied by the friction between rope and capstan.
Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.
Rescue Applications: Rope rescue teams, such as in swiftwater rescue or in high-angle technical rescue, use a Prusik hitch as a 'ratchet' or progress capture device. A Prusik with a Prusik minding pulley is used to hold a load while tensioning a line. The pulley advances the Prusik up the line and prevents it from going back out.
A Pentel Sharp ratchet drafting pencil disassembled, showing three 0.5 mm graphite leads. A Staedtler 925-25 05, assembled (top) and disassembled (bottom). A Pentel GraphGear 1000, featuring a clip-operated retractable lead guide pipe and lead hardness grade indicator set at HB. Rotring 600 metal body with matte coating.
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