(under subclass 203) Subject matter provided with an elongated rigid member which (a) is attached to and extends from the elevated vehicle-underlying support surface to the floor, (b) is distinct from the drive-means* for the support surface, and (c) holds the support surface in its elevated position if the drive-means* therefor fails by pushing against the surface of the floor or coacting with means for stopping (e.g., a stationary catch) its motion.
