Patents by Inventor Helmut Duscha

Helmut Duscha has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Rock drill
    Patent number: 7913777
    Abstract: The invention relates to a rock drill (1) for rotational and percussive action, comprising a drill head (2), a conveying helix (3), a clamping shank and a longitudinal drill axis (L), wherein the drill head (2) has at least one secondary cutting element (5a, 5b) with a front and a rear side face (10a, 10b) and wherein the secondary cutting element (5a, 5b) has a center of mass (M) and a cutting edge (11), the center of mass (M) and the cutting edge (11) defining a first plane (E1), the front side face (10a) of the secondary cutting element (5a, 5b) defining a second plane (E2) and the rear side face (10b) of the secondary cutting element (5a, 5b) defining a third plane (E3).
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: March 29, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Wolfgang Rieger, Helmut Duscha
  • ROCK DRILL
    Publication number: 20100163314
    Abstract: The invention relates to a rock drill (1) for rotational and percussive action, comprising a drill head (2), a conveying helix (3), a clamping shank and a longitudinal drill axis (L), wherein the drill head (2) has at least one secondary cutting element (5a, 5b) with a front and a rear side face (10a, 10b) and wherein the secondary cutting element (5a, 5b) has a centre of mass (M) and a cutting edge (11), the centre of mass (M) and the cutting edge (11) defining a first plane (E1), the front side face (10a) of the secondary cutting element (5a, 5b) defining a second plane (E2) and the rear side face (10b) of the secondary cutting element (5a, 5b) defining a third plane (E3).
    Type: Application
    Filed: July 31, 2007
    Publication date: July 1, 2010
    Inventors: Wolfgang Rieger, Helmut Duscha
  • Multi-purpose drilling tool
    Patent number: 7401667
    Abstract: The present invention relates to a multi-purpose drilling tool with a boring head, a drill twist connected thereto and a downstream clamping shank, a cutting element (1) being provided on the working side of the boring head. The cutting element (1) has a face (9, 24) with a rake angle (?) having a value of ??0° b, the cutting element (1) having a flank (10, 13) with a lip clearance angle (?) having a value of 5°???15° and, in particular, ??10°.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: July 22, 2008
    Assignee: Robert Bosch GmbH
    Inventors: Helmut Duscha, August Haussmann
  • Multi-purpose drilling tool
    Publication number: 20060243495
    Abstract: The present invention relates to a multi-purpose drilling tool with a boring head, a drill twist connected thereto and a downstream clamping shank, a cutting element (1) being provided on the working side of the boring head. The cutting element (1) has a face (9, 24) with a rake angle (?) having a value of ??0° b, the cutting element (1) having a flank (10, 13) with a lip clearance angle (?) having a value of 5°???15° and, in particular, ??10°.
    Type: Application
    Filed: November 12, 2004
    Publication date: November 2, 2006
    Inventors: Helmut Duscha, August Haussmann
  • Rotary impact drill bit
    Patent number: D525272
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: July 18, 2006
    Assignee: Robert Bosch GmbH
    Inventor: Helmut Duscha