Title: Trepanning and boring tool

Abstract: A trepanning tool is adapted to receive attachments for performing boring operations on trepanned holes. The attachments interengage with the trepanning unit to establish a boring diameter concentric with, and adjustable with respect to, the trepanned diameter without removing the trepanning cutter.

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Inventors: Gill, Geoffrey (Grand Haven, MI, US)
Pratt, Donald W. (Muskegon, MI, US)
Green, Bryant W. (Whitehall, MI, US)

Application Number: 549075
Filing Date: 1975-02-11
Publication_date: 1976-03-09
Assignee: Muskegon Tool Industries (Muskegon, MI)
Primary Class(es): 408/204 408/20, 408/197, 408/239A, 408/703
Other Classes:
US Patent Ref:

1780325	Nov, 1930	Williams	408/703.
3308689	Mar, 1967	MacDonald	408/703.

Other Refs:
Primary Examiner: McGehee, Travis S.
Assistant Examiner:
Attorney: Morse; Glenn B.