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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.
A high-tensile chain, also referred to as a transport chain, is a link chain with a high tensile strength used for drawing or securing loads. This type of chain usually consist of broad (thick/heavy) metal, oblong torus -shaped links for high strength.
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.
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.
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.
This is a vertical spool with a ratchet mechanism similar to a conventional winch, but with no crank handle or other form of drive. [7] The line is wrapped around the spool and can be tightened or reeled in by pulling the tail line. The winch takes the load once the pull is stopped with little operator tension needed to hold it.