Cutting by use of rotating axially moving tool – Tool or tool with support – With pitch-stabilizing ridge
Reexamination Certificate
2008-04-15
2008-04-15
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
With pitch-stabilizing ridge
C408S0010BD, C408S225000, C470S199000
Reexamination Certificate
active
11357461
ABSTRACT:
Methods and tool for simultaneously forming a bore in a work piece and forming a series of threads in said bore. In an embodiment, the tool has a predetermined axial length, a proximal end, and a distal end, said tool comprising: a shank located at said proximal end; a pilot drill portion located at said distal end; and a mill portion intermediately disposed between said shank and said pilot drill portion. The mill portion is comprised of at least two drill-tap sections of predetermined axial lengths and at least one transition section of predetermined axial length, wherein each of said at least one transition section is sandwiched between a distinct set of two of said at least two drill-tap sections. The at least two drill-tap sections are formed of one or more drill-tap cutting teeth spirally increasing along said at least two drill-tap sections, wherein said tool is self-advanced in said work piece along said formed threads, and wherein said tool simultaneously forms said bore and said series of threads along a substantially similar longitudinal axis.
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Camarda Charles J.
Franklin Larry D.
Penner Ronald K.
Pettit Donald R.
Howell Daniel W.
Ro Theodore U.
United States of America as represented by the Administrator of
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