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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.
This page was last edited on 4 September 2012, at 03:56 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Originally focusing on spiral ratchet and "plain" screwdrivers they soon expanded to various types of hand tools and eventually became a significant force in the tool industry. Eventually the success of the Yankee line of tools led the Stanley Works tool company to acquire the North Bros. in 1946, chiefly to improve their own product lines.
This ratchet was a very successful design, lasting from its introduction in 1961 to the eventual closure of New Britain in the 1980s. The ratchet was a compression engagement, using 12 teeth with a 60 tooth ratchet count. Later ratchets, from 1971 and onward, used a 9 tooth pawl making the ratchet a 45 tooth count.
This page was last edited on 19 June 2008, at 11:57 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
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.
An air ratchet wrench is very similar to hand-powered ratchet wrenches in that it has the same square drive, but an air motor is attached to turn the socket drive. Pulling the trigger activates the motor which turns the socket drive. A switch is provided to change which direction the socket drive turns. [1]
A set of metric spanners or wrenches, open at one end and box/ring at the other. These are commonly known as “combination” spanners. A wrench or spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts—or keep them from turning.