Patents by Inventor Stig R. Henriksson

Stig R. Henriksson 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).

  • Hydraulically operated percussive machine and an accumulator therefor
    Patent number: 4676323
    Abstract: A hydraulic percussive machine, for example a jack hammer or a rock drill, has an accumulator with a flexible diaphram (35). A lift valve (40, 41, 42) closes the outlet of the accumulator if the flow exceeds the normal flow substantially and it traps a volume of oil between the diaphragm and the valve when it closes.
    Type: Grant
    Filed: May 16, 1985
    Date of Patent: June 30, 1987
    Assignee: Atlas Copco Aktiebolag
    Inventor: Stig R. Henriksson
  • Pressure fluid operated percussive tool
    Patent number: 4563938
    Abstract: A cylinder (15) is reciprocable in the housing (11) of a hydraulic percussive tool and a piston hammer (16) is reciprocable in the cylinder. The force between the cylinder and the housing is constant during the cycle of reciprocation and as a result the housing (11) is practically not vibrating at all. The piston hammer (16) and the cylinder (15) are coupled together to move conjointly during a part of each forward stroke of the hammer piston, which ensures the timing of the reciprocation of the hammer piston 16 and the cylinder (15).
    Type: Grant
    Filed: July 23, 1984
    Date of Patent: January 14, 1986
    Assignee: Atlas Copco Aktiebolag
    Inventor: Stig R. Henriksson
  • Hydraulically operated impact motor
    Patent number: 4349075
    Abstract: A hydraulically operated impact motor, e.g. for a jack hammer, has a hammer piston that has a piston surface 19 in a pressure chamber 21 which is constantly pressurized in order to effect the work strokes of the hammer piston, and a larger piston surface 20 in a second pressure chamber 21 which is intermittently pressurized in order to effect the return strokes of the hammer piston. The second pressure chamber 22 is also connected to the exhaust line via a one-way valve that permits flow towards the second pressure chamber 22.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: September 14, 1982
    Assignee: Atlas Copco Aktiebolag
    Inventor: Stig R. Henriksson