Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1994-05-17
1997-07-22
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 72B, 408 80, 408115B, 408241B, B23B 3500, B23B 4900
Patent
active
056497911
ABSTRACT:
A device and associated method for drilling a hole in the center of a broken element that is engaged within a bore, thereby enabling the broken element to be retracted by engaging the newly drilled hole. The present invention includes a collar member that defines an open central channel between two opposite ends. The collar member includes a male region adapted to engage the bore should the broken element be broken within the bore below the surface. The collar assembly also includes a female region adapted to engage the broken element, should the broken element extend out of the bore. Regardless of whether the male region engages the bore or the female region engages the broken element, the collar member aligns the open central channel over the center of the broken element. A drill bit is then advanced through the open central channel, whereby the open central channel acts as a drill guide and prevents the drill bit from wandering away from the center of the broken element.
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Howell Daniel W.
LaMorte Eric A.
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