Apparatus For Cutting an Oval Hole in the Wall of a Pipe

摘要

The invention relates to an apparatus for cutting an oval hole in the wall of a pipe. The pipe secured to a baseplate ( 1 ) of the apparatus is cut for an oval hole by means of a tool ( 20 ) having its cutter head ( 24 ) rotated about its axis while it is driven along a circular path in relation to a carriage ( 2 ) of the apparatus. The carriage ( 2 ) is mounted on the baseplate ( 1 ) by way of linear runners ( 3 ). Adapted for rotation along with a drive pulley ( 4 ) of the tool ( 20 ) is a cogged wheel ( 10 ), which through the transmission of a cam lever ( 11 ) is adapted to drive a shaft ( 12 ) having its rotational motion transmitted on the one hand to drive a gear ( 22 ) and on the other hand to work the carriage ( 2 ) back and forth in relation to the baseplate ( 1 ), a round-trip displacement ( 2 xa) being equal to a difference between the major axis and the minor axis of a desired ellipse.