A power column is a hollow post having six vertical walls and is mounted between horizontal arms pivoted to the floor and ceiling respectively. The pivotal axis for the arms passes through the head end of a hospital bed, enabling the power column to swing from one side of the bed to the other. The electrical...http://www.google.ca/patents/US5452807?utm_source=gb-gplus-sharePatent US5452807 - Accessories for pivoted power column
