.~ Opposed barrier-engaging; e.g., rock drill column
DEFINITION
Classification: 52/112
(under subclass 111) Structure in which the terminal ends of shaft section which are movable longitudinally each have on their outer ends means for engaging opposed barriers, e.g., floor and ceiling of a mine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
122.1+, for a building component with hoist or handle means.
SEE OR SEARCH CLASS
173, Tool Driving or Impacting,
31+, for such devices with work engaging means supporting the tool device.
211, Supports: Racks, 123+, for a horizontal rod type rack which includes means engaging opposed walls.
248, Supports,
200.1, for an extensible column mounted between opposed surfaces for supporting a bracket; and subclass 644 for such a column for supporting a machine.
254, Implements or Apparatus for Applying Pushing or Pulling Force, appropriate subclass for an extensible device, designed to move an object, particularly
93, for a fluid operated device, subclass 95 for a rack and pinion operated device, subclasses 98+ for a screw-operated device, and subclass 387 for a cable-operated device.
