stepped gear

from The Collaborative International Dictionary of English v.0.48

Stepped \Stepped\, a.
   Provided with a step or steps; having a series of offsets or
   parts resembling the steps of stairs; as, a stepped key.
   [1913 Webster]

   {Stepped gear}, a cogwheel of which the teeth cross the face
      in a series of steps.
      [1913 Webster]