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  2. Ratchet (device) - Wikipedia

    en.wikipedia.org/wiki/Ratchet_(device)

    A ratchet consists of a round gear or a linear rack with teeth, and a pivoting, spring-loaded finger called a pawl (or click, in clocks and watches [1] [2]) that engages the teeth. The teeth are uniform but are usually asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge.

  3. Socket wrench - Wikipedia

    en.wikipedia.org/wiki/Socket_wrench

    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.

  4. Escapement - Wikipedia

    en.wikipedia.org/wiki/Escapement

    As the wheel turns, one tooth pushes against the upper pallet, rotating the shaft and the attached foliot. As the tooth pushes past the upper pallet, the lower pallet swings into the path of the teeth on the other side of the wheel. A tooth catches on the lower pallet, rotating the shaft back the other way, and the cycle repeats.

  5. Hirth joint - Wikipedia

    en.wikipedia.org/wiki/Hirth_joint

    Hirth joint made from anodized aluminum to show the meshing of the teeth Hirth joint (disassembled) between the semi-axles of a Campagnolo Ultra-Torque crankset. A Hirth joint or Hirth coupling is a type of mechanical connection named after its developer Albert Hirth. It is used to connect two pieces of a shaft together and is characterized by ...

  6. Twisted Metal - Wikipedia

    en.wikipedia.org/wiki/Twisted_Metal

    Twisted Metal is a series of vehicular combat video games originally developed by SingleTrac and published by Sony Interactive Entertainment.The series has appeared on the PlayStation, PlayStation 2, PlayStation Portable and PlayStation 3.

  7. Ratchet (instrument) - Wikipedia

    en.wikipedia.org/wiki/Ratchet_(instrument)

    A ratchet or rattle, more specifically, cog rattle [1] is a musical instrument of the percussion family and a warning/signaling device. It operates on the principle of the ratchet device , using a gearwheel and a stiff board mounted on a handle, which rotates freely.

  8. Dental implant - Wikipedia

    en.wikipedia.org/wiki/Dental_implant

    Dental implant, 3D illustration. A dental implant (also known as an endosseous implant or fixture) is a prosthesis that interfaces with the bone of the jaw or skull to support a dental prosthesis such as a crown, bridge, denture, or facial prosthesis or to act as an orthodontic anchor.

  9. Dental notation - Wikipedia

    en.wikipedia.org/wiki/Dental_notation

    The uppercase letters A through T are used for primary teeth and the numbers 1 – 32 are used for permanent teeth. The tooth designated "1" is the maxillary right third molar ("wisdom tooth") and the count continues along the upper teeth to the left side. Then the count begins at the mandibular left third molar, designated number 17, and ...