Hollow annular drill bit with hollow cylindrical carrier member

Details Hollow annular drill bit with hollow cylindrical carrier member Hollow annular drill bit with hollow cylindrical carrier member

1995-10-12

1996-10-29

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

408703, 175403, B23B 5104

Patent

active

055690025

ABSTRACT:
A hollow annular drill bit is formed of an axially extending hollow cylindrical carrier member (1) and cutter members (2). The cutter members (2) are secured in recesses (1c) in the carrier member, so that they project axially from and radially inwardly and radially outwardly from the leading end region of the carrier member. The carrier member (1) has increased wall thickness sections enclosing the recesses, whereby sufficiently large connecting surfaces are available for securing the cutter members (2).

REFERENCES:
patent: 1115010 (1914-10-01), Patrosio
patent: 3308689 (1967-05-01), McDonald
patent: 4274769 (1981-06-01), Multakh
patent: 4408935 (1983-10-01), Miyanaga

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