Patents Assigned to DreBo Werkzeugfabrik GmbH
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Patent number: 9879483Abstract: A drill head insert or drill head attachment, in particular a drill plate made of hard metal, for a rock drill, includes cutting edges (20, 20a) configured on the feed side which extend from a tip of the drill (18) rearward in a receding manner to an outer face (12, 14) of the drill plate (10). A drill plate (10) is substantially configured in the form of a roof when viewed from the side. A free face (24, 24a) at the cutting edge (20, 20a) abuts against a cutting face (22, 22a) along a substantial part of its extension between the tip of the drill (18) and the outer face (12, 14). A substantially smooth contour of the cutting edge (20, 20a) is interrupted by at least one projection (30, 30a, 30b) which projects beyond the cutting edge (20, 20a) in the feed direction.Type: GrantFiled: November 7, 2014Date of Patent: January 30, 2018Assignee: DREBO WERKZEUGFABRIK GMBHInventors: Alexander Zuern, Alexis Ickert, Martin Stumpp
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Patent number: 9718136Abstract: A drill with a drill flute (12) includes symmetrical fluted lands (20) helically extend around a core, wherein grooves (18) remain between the fluted lands, said grooves having a width (72) that exceeds the spine thickness or width (24) of the fluted lands (20), and wherein the grooves (18) comprise a convex core reinforcement (22) at the groove bottom thereof. The width (24) of the fluted lands (20) at the drill head side end (16) is smaller than at the shank side end (14) of the drill helix (12), and at least increases in certain areas. The core reinforcement (22) at the drill head side end (16) is more convex than at the shank side end (14), thus has larger radii (40, 42).Type: GrantFiled: November 7, 2014Date of Patent: August 1, 2017Assignee: DreBo Werkzeugfabrik GmbHInventors: Martin Stumpp, Alexander Zurn, Peter Kehrle, Tobias Berg
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Patent number: 4989681Abstract: A drill bit for producing an undercut. The drill bit includes a shaft and a cutting edge that is disposed asymmetrically radially beyond the shaft in a front end portion of the drill bit. A planar guide surface is provided on a conical end face of the drill bit. This guide surface is disposed radially opposite the cutting edge. The guide surface terminates at a concentric tip of the drill bit.Type: GrantFiled: June 9, 1989Date of Patent: February 5, 1991Assignee: DreBo Werkzeugfabrik GmbHInventors: Johann Lohmuller, Klaus Dreps
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Patent number: D922840Type: GrantFiled: May 6, 2019Date of Patent: June 22, 2021Assignees: MILWAUKEE ELECTRIC TOOL CORPORATION, DREBO WERKZEUGFABRIK GMBHInventors: Steven W. Hyma, Anthony R. Erickson, Max R. Sawa, Tobias Berg, Nicolai Rumpel
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Patent number: D922841Type: GrantFiled: May 6, 2019Date of Patent: June 22, 2021Assignees: MILWAUKEE ELECTRIC TOOL CORPORATION, DREBO WERKZEUGFABRIK GMBHInventors: Steven W. Hyma, Anthony R. Erickson, Max R. Sawa, Tobias Berg, Nicolai Rumpel
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Patent number: D922842Type: GrantFiled: May 6, 2019Date of Patent: June 22, 2021Assignees: MILWAUKEE ELECTRIC TOOL CORPORATION, DREBO WERKZEUGFABRIK GMBHInventors: Steven W. Hyma, Anthony R. Erickson, Max R. Sawa, Tobias Berg, Nicolai Rumpel
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Patent number: D923447Type: GrantFiled: May 6, 2019Date of Patent: June 29, 2021Assignees: MILWAUKEE ELECTRIC TOOL CORPORATION, DREBO WERKZEUGFABRIK GMBHInventors: Steven W. Hyma, Anthony R. Erickson, Max R. Sawa, Tobias Berg, Nicolai Rumpel
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Patent number: D937650Type: GrantFiled: May 6, 2021Date of Patent: December 7, 2021Assignees: MILWAUKEE ELECTRIC TOOL CORPORATION, DREBO WERKZEUGFABRIK GMBHInventors: Steven W. Hyma, Anthony R. Erickson, Max R. Sawa, Tobias Berg, Nicolai Rumpel
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Patent number: D938249Type: GrantFiled: May 6, 2021Date of Patent: December 14, 2021Assignees: MILWAUKEE ELECTRIC TOOL CORPORATION, DREBO WERKZEUGFABRIK GMBHInventors: Steven W. Hyma, Anthony R. Erickson, Max R. Sawa, Tobias Berg, Nicolai Rumpel
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Patent number: D941113Type: GrantFiled: May 6, 2021Date of Patent: January 18, 2022Assignees: MILWAUKEE ELECTRIC TOOL CORPORATION, DREBO WERKZEUGFABRIK GMBHInventors: Steven W. Hyma, Anthony R. Erickson, Max R. Sawa, Tobias Berg, Nicolai Rumpel