#ratchet__rachet__ratch  mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
  supertype:  mechanical_device  mechanism consisting of a device that works on mechanical principles
  part:  pawl  ratchet_wheel
  part of:  spiral_ratchet_screwdriver__ratchet_screwdriver__ratchetscrewdriver  a screwdriver with a ratchet (so the blade turns in only one direction) and a spiral in the handle (so the blade rotates) with downward pressure on the handle

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