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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.
Spiral ratchet screw drivers, often colloquially called Yankee screwdrivers (a brand name), provide a special mechanism that transforms linear motion into rotational motion. Originally the " Yankee " name was used on all tools sold by the North Brothers Manufacturing Company but later, after Stanley purchased the company, it became synonymous ...
The trade name "Yankee" screwdriver was first marketed by North Brothers Manufacturing Company in ≈16 April 1895, with the No. ≠130 spiral ratchet screwdriver. Yankee soon became and still is a well-known name in automatic spiral ratchet screwdrivers , with several other models, and model improvements patented by North Bros. over a 40-year ...
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.
The company has a tool line of over 3,500 items including wrenches, ratchets, screwdrivers, tool boxes and air tools. In 2021, SK was acquired by Hangzhou GreatStar Industrial. Jay Leno described the company as "an iconic American brand for decades," [2] and the company is known for inventing the round-head ratchet wrench.
ratcheting box wrench: ratcheting ring spanner: A type of ring spanner, or box wrench, whose end section ratchets. Ratcheting can be reversed by flipping over the wrench, or by activating a reversing lever on the wrench. This type of wrench combines the compact design of a box wrench, with the utility and quickness of use of a ratchet wrench.