Meaning of walking beam

walk'ing beam"

Pronunciation: [key]
— Mach. Mach.
  1. an overhead oscillating lever, pivoted at the middle, for transmitting force from a vertical connecting rod below one end to a vertical connecting rod, pump rod, etc., below the other end.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.