Drilling tool

Patent · Tue Sep 27 00:00:00 EDT 1983

OSTI ID:5612253

Baumann, O; Dohse, H P; Reibetanz, W; Wanner, K

A drilling tool is disclosed which has a drilling shaft member, a crown drilling member with an annular wall provided with a plurality of cutting edges and detachably mounted on the shaft member, a center drilling member detachably mounted on the shaft member inside the crown drilling member and having a further cutting edge, and elements for limiting a drilling depth of the tool when the center drilling member is mounted on the shaft member. Thereby, the operator of the drilling tool, after drilling a guiding groove in a rock, is forced to remove the center drilling member from the drilling tool and drill further without the center drilling member, which increases the drilling efficiency.

• Assignee: Robert Bosch GmbH (Germany, Federal Republic Of)
• Patent Number(s): US 4406334
• OSTI ID: 5612253
• Resource Relation: Patent Priority Date: Priority date 3 Nov 1980, Germany, Federal Republic of (F.R. Germany); Other Information: PAT-APPL-299773
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
DRILL BITS
DESIGN
DRILLING EQUIPMENT
ROCK DRILLING
DRILLING
EQUIPMENT
420206* - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)