Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Having tool-opposing – work-engaging surface
Reexamination Certificate
2008-04-22
2008-04-22
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Having tool-opposing, work-engaging surface
C408S103000
Reexamination Certificate
active
10484733
ABSTRACT:
A V-shaped frame102is attached to a pipe100to be drilled. The frame may be used with larger pipes by attaching a removable extension plates120to the arms104 106of the V-shaped frame, thereby increasing the size of the recess between the arms104, 106. The apparatus may be fixed to the pipe100by a chain110which connects to the platform102and extends around the pipe100, or by attaching clips to the frame and attaching the clips to the surface of the pipe by screws etc. To attach the apparatus to a pipe having a corrugated outer surface, clamp members340extend into the grooves308″ of the corrugations to grip the groove walls316.
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Howell Daniel W.
Jackson & Walker, LLP
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