US PATENT SUBCLASS 408 / 80
.~.~ Opening coaxial with tool

Current as of: June, 1999
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408 /   HD   CUTTING BY USE OF ROTATING AXIALLY MOVING TOOL

72 R  DF  WITH WORK-ENGAGING STRUCTURE OTHER THAN TOOL OR TOOL-SUPPORT {13}
79  DF  .~ Frictionally engaging sides of opening in work {1}
80.~.~ Opening coaxial with tool {2}
81  DF  .~.~.~> Engaging sides of opening being enlarged by tool {2}
83.5  DF  .~.~.~> Valve fitting

DEFINITION

Classification: 408/80

(under subclass 79) Device wherein the work-contacting means is adapted to contact the wall of a cylindrical opening in the work, the axis of which opening is co-extensive with the tool-axis.