Drill tool for making a drilled hole with an undercut

Details Drill tool for making a drilled hole with an undercut Drill tool for making a drilled hole with an undercut

1992-03-13

1993-03-30

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Including detailed shank

82 12, 408230, B23B 5102

Patent

active

051978334

ABSTRACT:
The drill tool for drilling a drilled hole with an undercut in a wall has a drill tool shaft having a drill head at a free end of the drill tool shaft, a depth insertion stop formed on the drill tool shaft to limit an insertion depth of the drill tool in the drilled hole and cutting elements projecting laterally from the drill head for making the undercut. The drill tool shaft (15) has an enlarged portion (10) acting as a pivot bearing for making the undercut spaced approximately equally from the insertion depth stop (4) and the drill head (6). To prevent sticking of the drill tool in the drilled hole the drill tool shaft (15) also has a cylindrical step portion (11) connected to the enlarged portion (10) and located between the enlarged portion (10) and the insertion depth stop (4). A discontinuous transition between the enlarged portion (10) and the cylindrical step portion (11) forms a scraping edge (12) and the cylindrical step portion (11) has a diameter less than a diameter of the enlarged portion (10). Another cylindrical step portion (14) with another scraping edge can also be provided.

REFERENCES:
patent: 5092717 (1992-03-01), Fischer
patent: 5096344 (1992-03-01), Fischer

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