Patents by Inventor Dirk Mahlmann

Dirk Mahlmann 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).

  • Patent number: 8348541
    Abstract: Joint arrangement for a vehicle, with a joint (7), which has a joint housing (8) and a pivot pin (9) mounted movably in relation thereto; a rod (4), which has a cavity (6) and which is connected to the joint (7); a ring element arranged between the joint and the rod; a sealing bellows (10), which defines the interior space (11) and in which the joint (7) is arranged at least partially; and a gas-permeable connection (13), which connects the cavity (6) of the rod (4) to the interior space (11) of the sealing bellows (10), wherein at least part of the gas-permeable connection (13) is formed by at least one groove, which is formed on the ring element and opens into the interior space (11) of the sealing bellows (10).
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: January 8, 2013
    Assignee: ZF Friedrichshafen AG
    Inventors: Dirk Mählmann, Benjamin Ziebart
  • Publication number: 20110293359
    Abstract: A ball joint with a housing formed entirely by a cold forming method. The housing having an inner chamber for receiving the joint ball of a ball pin and an opening through which the ball pin extends, and a contact area on the outer surface area of the housing forms a seal with a bellows. A forming section of the housing secures the joint ball within the inner chamber such that the joint pall can both rotate and pivot. Following completion of the housing, the material displaced during the cold forming method creates the forming section of the housing. The method for producing a ball joint comprises the steps of producing a metallic housing blank with a thickening formed by compression, forming the outer contour of the housing by compression, shaping the inner contour of the housing through dishing, and using the displaced material for creating the forming section.
    Type: Application
    Filed: December 15, 2009
    Publication date: December 1, 2011
    Applicant: ZF FRIEDRICHSHAFEN AG
    Inventors: Dirk Mahlmann, Frank Schmeink, Benjamin Ziebart, Horst Pott, Christian Rziczny, Michael Heuer Gen Hallmann, Philippe Milos, Wolfgang Kleiner, Reinhard Buhl, Jurgen Schmitz
  • Publication number: 20100284733
    Abstract: The invention relates to an axial ball joint (1) in particular for use in a steering gear including a housing (2), open on one side, with a housing pin (3) arranged up front, a ball joint (4) with a pivot pin (5) and a bearing (6) which is arranged between housing (2) and ball joint (4), wherein the housing (2) has at least one elastic damping element (7) for impact damping on the side of the housing equipped with the housing pin (3).
    Type: Application
    Filed: December 10, 2008
    Publication date: November 11, 2010
    Applicant: ZF FRIEDRICHSHAFEN AG
    Inventors: Rainer Ungruh, Volker Grube, Jens Diekhoff, Markus Mollmann, Benjamin Ziebart, Dirk Mahlmann
  • Publication number: 20090236812
    Abstract: A joint arrangement for a vehicle is provided including a joint (7), which has a joint housing (8) and a pivot pin (9) mounted movably in relation thereto. The joint arrangement has a rod (4), which has a cavity (6) and which is connected to the joint (7). A sealing bellows (10) defines an interior space (11) in which the joint (7) is arranged at least partially. A gas-permeable connection (13) connects the cavity (6) of the rod (4) to the interior space (11) of the sealing bellows (10). At least one part of the gas-permeable connection (13) is formed by at least one bore (14), which is formed in the joint (7) and which opens into the cavity (6) of the rod (4).
    Type: Application
    Filed: May 8, 2007
    Publication date: September 24, 2009
    Applicant: ZF FRIEDRICHSHAFEN AG
    Inventors: Dirk Mahlmann, Benjamin Ziebart
  • Publication number: 20090208273
    Abstract: Joint arrangement for a vehicle, with a joint (7), which has a joint housing (8) and a pivot pin (9) mounted movably in relation thereto; a rod (4), which has a cavity (6) and which is connected to the joint (7); a ring element arranged between the joint and the rod; a sealing bellows (10), which defines the interior space (11) and in which the joint (7) is arranged at least partially; and a gas-permeable connection (10), which connects the cavity (6) of the rod (4) to the interior space (11) of the sealing bellows (10), wherein at least part of the gas-permeable connection (13) is formed by at least one groove, which is formed on the ring element and opens into the interior space (11) of the sealing bellows (10).
    Type: Application
    Filed: May 8, 2007
    Publication date: August 20, 2009
    Inventors: Dirk Mählmann, Benjamin Ziebart
  • Patent number: 5492427
    Abstract: A ball joint and a work process for preparing such a ball joint are described, in which the housing is prepared in one piece by a sheet metal shaping process. An edge bead, which is used to close the housing by a cover, is prepared by material deformation on the outer circumference of the housing. A groove for receiving the sealing bellows, which groove is likewise located on the outer circumference of the housing, is formed during the shaping process, so that machining of the housing is not necessary.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: February 20, 1996
    Assignee: Lemforder Metallwaren AG
    Inventors: Metin Ersoy, Dirk Mahlmann, Klemens Meyer, Paul Westphal, Uwe Zeibig