Patents Assigned to Deilmann-Haniel Maschinin-und Stahlbau
  • “Twin-impact” double-blow drilling apparatus
    Patent number: 6202763
    Abstract: A drilling apparatus 1 having a twin-impact system can work continuously with a shank end 5 is provided with a compensation ring 10 on the rotary impact side, which has a material with hardness that is lower than that of the material of the pipe and striker 8 and/or corresponding to the adjacent end portion 11 of the shank end 5 and has a shape and/or surfaces 21, 22 to compensate for the applied forces.
    Type: Grant
    Filed: April 22, 1999
    Date of Patent: March 20, 2001
    Assignee: Deilmann-Haniel Maschinin-und Stahlbau
    Inventors: Dieter Gude, Josef Maus