Patents Assigned to Technisch Handels- en Adviesbureau van Geffen B.V.
  • Method of interconnecting several parts, such as a piece of tubing and a plate, a tube or similar body
    Patent number: 4260094
    Abstract: The method of using the frictional heat and pressure produced by a rapidly rotating non-cutting piercing tool to weld two or more parts, such as a piece of tubing on one hand and a plate, a tube or another body having locally a relatively thin wall on the other hand, together, to which end said piercing tool is forced through the two or more parts after the latter have been placed in the exact relative positions.
    Type: Grant
    Filed: May 30, 1979
    Date of Patent: April 7, 1981
    Assignee: Technisch Handels-en Adviesbureau van Geffen B.V.
    Inventor: Christiaan A. Stroo
  • Rotatable piercing tools for forming bossed holes
    Patent number: 4185486
    Abstract: A rotary piercing tool for forming, in a metal plate or the wall of a metal tube, by pressure and friction-generated heat a bossed hole, said tool comprising a tapered active end portion at one end, a shank for its attachment in a chuck of a machine tool at the other end and a coaxial cavity extending from the free end of said shank to a place at a given distance from the free end of said active end portion.
    Type: Grant
    Filed: November 17, 1978
    Date of Patent: January 29, 1980
    Assignee: Technisch Handels- en Adviesbureau van Geffen B.V.
    Inventor: Johannes A. van Geffen
  • Rotatable piercing tools for forming holes surrounded each by a boss in metal plates or the wall of metal tubes
    Patent number: 4177659
    Abstract: A rapidly rotatable piercing tool for forming, substantially by frictional heat and pressure, a bossed hole in a metal plate or tube wall, said tool comprising a head of greater diameter, whereby a shoulder facing the leading end of the tool is formed for so shaping one of the end faces of the boss surrounding the hole, as to round off, to bevel off or to deepen said end face towards the hole in an annular region bordering the hole.
    Type: Grant
    Filed: January 24, 1978
    Date of Patent: December 11, 1979
    Assignee: Technisch Handels- en Adviesbureau van Geffen B.V.
    Inventor: Johannes A. van Geffen
  • Methods and apparatuses for forming by frictional heat and pressure holes surrounded each by a boss in a metal plate or the wall of a metal tube
    Patent number: 4175413
    Abstract: A method of and an apparatus for forming by frictional heat and pressure a bossed hole in a metal plate or a tube wall with the aid of a rapidly rotating piercing tool, of which the axial feed is controlled, in such a manner, that during a predetermined time from the point of time, at which the tool comes into contact with the plate or tube wall the axial movement of the tool is slower and after that time said movement is faster than a movement of given speed.
    Type: Grant
    Filed: January 24, 1978
    Date of Patent: November 27, 1979
    Assignee: Technisch Handels- en Adviesbureau van Geffen B.V.
    Inventor: Johannes A. van Geffen