Drilling tool
AssigneeDreBo Werkzeug Fabrik GmbH
InventorsAlexander Zürn, Martin Stumpp
Life of this patent
Estimating the term…
Abstract
The invention relates to a drilling tool having a large drill, in particular a core drill, in which a center drill is guided in an axially flexible or movable manner, with the axial movement of said center drill relative to said large drill being limited by at least one limit stop, wherein at least one pin that is supported on the large drill, the shaft thereof or a transition therebetween, extends toward the center drill, and the pin (24) is formed at an attachment body (26) comprising a contact surface (46) that abuts on a counter contact surface (52) of the drilling tool (10) and in particular has at least partially a larger lateral extension than the pin.
Claims14
A drilling tool having
- a large core drill (24);
- a center drill (14) mounted in an axially flexible manner within the large drill;
- at least one limit stop limiting axial movement of said center drill relative to the large drill;
- at least one pin (24) that is supported on the large drill, the shaft thereof extending towards the center drill (14);
- characterized in that
- the pin (24) is formed at an attachment body (26) comprising a contact surface (46) that abuts on a counter contact surface (52) of the drilling tool (10), the contact surface (46) of the pin (24) of the drilling tool (10) is configured as a conical surface that extends in self-locking manner with a cone angle toward the pin, the angle being smaller than 15 degrees and larger than 5 degrees.
Dependencies are inferred from the claim text.