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  2. Socket wrench - Wikipedia

    en.wikipedia.org/wiki/Socket_wrench

    Pass-through sockets and ratchets are built for 1 ⁄ 4-inch, 38-inch and 1 ⁄ 2-inch sets in both SAE and metric sizes. By using a fine tooth ratchet and socket system that allow a pass-through ratchet to be used as a conventional ratchet handle with interchangeable 1 ⁄ 4-inch and 38-inch drives some ratchets can be used with ...

  3. Wheel train - Wikipedia

    en.wikipedia.org/wiki/Wheel_train

    Used in watches, the keyless works are the gears that wind the mainspring when the crown is turned, and when the crown is pulled out allow the hands to be set. [8] [9] The term originated because, before the modern form of keyless works was invented by the French watchmaker Adrien Philippe in 1843, watches were wound and set by inserting a ...

  4. Pulley - Wikipedia

    en.wikipedia.org/wiki/Pulley

    The drive element of a pulley system can be a rope, cable, belt, or chain. The earliest evidence of pulleys dates back to Ancient Egypt in the Twelfth Dynasty (1991–1802 BC) [1] and Mesopotamia in the early 2nd millennium BC. [2] In Roman Egypt, Hero of Alexandria (c. 10–70 AD) identified the pulley as one of six simple machines used to ...

  5. Breaker bar - Wikipedia

    en.wikipedia.org/wiki/Breaker_bar

    Breaker bar. A breaker bar (also known as a power bar) is a long non-ratcheting bar that is used with socket wrench-style sockets.They are used to break loose very tight fasteners because their additional length allows the same amount of force to generate significantly more torque than a standard length socket wrench.

  6. Wrench - Wikipedia

    en.wikipedia.org/wiki/Wrench

    This tool is a long non-ratcheting bar that allows the user to impart considerable torque to fasteners, especially in cases where corrosion has resulted in a difficult-to-loosen part. socket crowfoot wrench crow's-foot wrench: crow's foot: A type of wrench designed to use the same drive sizes as socket wrenches, but non-cylindrical in shape.

  7. Rack and pinion - Wikipedia

    en.wikipedia.org/wiki/Rack_and_pinion

    A rack and pinion has roughly the same purpose as a worm gear with a rack replacing the gear, in that both convert torque to linear force. However the rack and pinion generally provides higher linear speed — since a full turn of the pinion displaces the rack by an amount equal to the pinion's pitch circle whereas a full rotation of the worm screw only displaces the rack by one tooth width.

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