Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Reexamination Certificate
2004-09-23
2008-11-25
Gay, Jennifer H (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Bit with leading portion forming smaller diameter initial bore
C408S225000
Reexamination Certificate
active
07455129
ABSTRACT:
A drilling and/or chiseling tool, in particular for machining materials such as concrete, rock, masonry, and the like, having a hard metal cutting element (1) contained in the machining end of the tool head, a radially outer, second working region (II) of the hard metal cutting element (1) being set back in relation to a central, first working region (I) of the hard metal cutting element (1) and the two working regions (I, II) transitioning into each other via a third working region (III). The third working region (III) is at least partially comprised of at least one partial circumference surface (5, 6) of at least one conical surface.
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Moser Bernhard
Widmann Rainer
Gay Jennifer H
Robert & Bosch GmbH
Stephenson Daniel P
Striker Michael J.
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