Portable Surfacing Machine for Boiler Manhole.
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent is for a portable machine is provided for in-place grinding of an inside elliptical face of an elliptical bioler manhole access with a grinder which has a flat grinding surface. The boiler manhole access also has an outside elliptical face and a conforming elliptical edge therebetween. The machine includes a supporting structure which is adapted to be fixedly mounted in the manhole access and span the elliptical inside edge. A spindle is rotatably mounted on the support structure with its longitudinal axis of the manhole access. A sleeve is fixedly mounted to one end of the spindle in a direction perpendicular thereto, and an elongated hollow slide means is slidably mounted on the sleeve. The slide and the sleeve are in gas communication with one another so that when gas pressure is applied thereto the slide is outwardly spring biased from the spindle. The grinder is mounted to the slide with the grinding surface engageable with the inside elliptical face. A device is also mounted on the slide and responsive to the spring bias for following the contour of the elliptical edge of the manhole access when the spindle is rotated and correspondingly moving the slide to maintain the grinding surface in an opposed position with respect to the inside elliptical face at all times while the spindle is being rotated. When the spindle is rotated and gas pressure is applied, the above arrangement enables the maintenance of the grinding surface of the grinder in an engageable position with respect to the inside elliptical face.
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