Holdown Ramp Control

  • HOLDOWN - A mechanical, electrical or hydraulic device that holds a dock leveler at a set height above, at, or below dock level.
  • RAMP CONTROL - A mechanical device using a ratchet bar and pawl assembly to hold a dock-leveler at a particular position.
  • RATCHET BAR - A steel bar with inclined teeth on one face which when used with a pawl only allows movement of the bar in one direction.
  • PAWL - A toothed device that when engaged with a ratchet bar limits the travel of the bar to one direction.
  • RACK BAR - A flat bar with teeth cut in one face to allow a round gear with corresponding teeth to roll back and forth changing rotary motion into linear motion or vice versa.