Patents by Inventor Kurt H. Andersson

Kurt H. Andersson 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).

  • Device for efficient energy transfer and damping of impact drilling machines
    Patent number: 4993504
    Abstract: Device in impact machines. The device comprises a first chamber (5) which is connected to an accumlator (6) and the pressure of which is used to hold together a set of rods (2) forming part of the drill tool. Furthermore there is a second chamber (7) to damp the recoil from the set of rods.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: February 19, 1991
    Assignee: Atlas Copco MCT AB
    Inventors: Jorgen A. R. Rodert, Kurt H. Andersson
  • Device for controlling the passage of a flushing medium in impact machines
    Patent number: 4991669
    Abstract: Device in impact machines. The device comprises a set of rods comprising a number of rods (6) which are journalled in a surrounding set of tubes (7) by means of elastic bushings (52, 53). One of the bushings is provided with a lip (54) which sealingly rests against the rod (6) when flushing medium is not supplied to the space between the set of rods and the set of tubes but allows passage of flushing medium at drilling.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: February 12, 1991
    Assignee: Atlas Copco MCT AB
    Inventor: Kurt H. Andersson
  • Rock drilling apparatus
    Patent number: 4387775
    Abstract: Rock drilling apparatus including a pressure fluid driven rock drilling machine (10) and a drill unit (11). The drill unit (11) includes a drill rod (18), a drill bit (16) and a tube (20) surrounding the drill rod (18). The drill rod (18) has a collar (22) in front of a shank (21), the collar (22) maintaining the tube (20) rotatably therebetween and between the drill bit (16). The rock drilling machine (10) includes coupling device (46; 57), a socket means (42) and a rotation chuck (44) for receiving and holding the tube (20) and shank (21) connected to the machine (10), the tube (20) being radially spaced around the drill rod (18) and non-rotatably connected to the socket means (42).
    Type: Grant
    Filed: March 24, 1981
    Date of Patent: June 14, 1983
    Assignee: Atlas Copco Aktiebolag
    Inventors: Ebbe S. Adolfsson, Kurt H. Andersson, Carl G. B. Ekwall