CONCENTRIC PNEUMATIC/HYDRAULIC POWER FEED APPARATUS

摘要

A power feed apparatus for applying a thrust force to an output shaft (52) o f a motor driven tool (34) to drive the output shaft linearly towards and away from a workpiece without applying off-axis forces to the output shaft that would cause it to move out of perfect perpendicular alignment to the outer surface of the workpiece. The apparatus includes a first tubular member (18) which is fixedly secured to a jig or other like mounting structure associate d with the workpiece. A second tubular member (20) is disposed for sliding linear movement along the first tubular member. Spaced apart annular fluid chambers (50, 72) are formed within the apparatus along with associated flui d ports (22, 28) for allowing a pressurized fluid to be used to both extend an d retract the output shaft of the tool. The tool itself is supported on the second tubular member and thus moves linearly along with the second tubular member.