Patents by Inventor Friedrich Hoppmann

Friedrich Hoppmann 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).

  • Railway bogie
    Patent number: 7934458
    Abstract: An axlebox-spring-unit of a railway bogie includes at least one hydraulic spring having a housing required for functionality of the hydraulic spring, and an axlebox. At least a part of the axlebox forms at least a part of the housing.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: May 3, 2011
    Assignees: AB SKF, Contitech Luftfedersysteme GmbH
    Inventors: Volker Gedenk, Friedrich Hoppmann, Rolf Schmiechen, John Skiller
  • Spring element for rail vehicles
    Patent number: 7484719
    Abstract: A spring element (2) consists essentially of an elastic spring body (4) which is fixed between two rigid end parts (6, 8) arranged at a variable spacing from each other. The spring body (4) consisting of rubber or a rubber-type plastic has a rotationally symmetrical cross section, the longitudinal section shows a biconvex surface line. A U-shaped cross section is formed as a result of a cavity (10). The abrasion caused by the introduction of vertical and horizontal forces is to be reduced and an easy, horizontal slide is to be made possible. The surface (12) of the spring body (4) is provided with ribs (14; 14a, . . . ) that are arranged at spacings (A) from each other and are intersected by ribs (16; 16a, . . . ) or groups of ribs (16, . . . ) also arranged at spacings (A) from each other. Polygonal fields (18a, . . . ) are formed on the surface (12) of the spring body (4) in the gaps between the ribs (14, . . . ; 16, . . . ) according to the angle of intersection.
    Type: Grant
    Filed: December 8, 2004
    Date of Patent: February 3, 2009
    Assignee: ContiTech Luftfedersysteme GmbH
    Inventors: Volker Gedenk, Andreas Kropf, Friedrich Hoppmann
  • Railway bogie
    Publication number: 20070175356
    Abstract: An axlebox-spring-unit of a railway bogie includes at least one hydraulic spring having a housing required for functionality of the hydraulic spring, and an axlebox. At least a part of the axlebox forms at least a part of the housing.
    Type: Application
    Filed: March 26, 2004
    Publication date: August 2, 2007
    Applicant: AB SKF
    Inventors: Volker Gedenk, Friedrich Hoppmann, Rolf Schmiechen, John Skiller
  • Spring element for rail vehicles
    Publication number: 20070158886
    Abstract: A spring element (2) consists essentially of an elastic spring body (4) which is fixed between two rigid end parts (6, 8) arranged at a variable spacing from each other. The spring body (4) consisting of rubber or a rubber-type plastic has a rotationally symmetrical cross section, the longitudinal section shows a biconvex surface line. A U-shaped cross section is formed as a result of a cavity (10). The abrasion caused by the introduction of vertical and horizontal forces is to be reduced and an easy, horizontal slide is to be made possible. The surface (12) of the spring body (4) is provided with ribs (14; 14a, . . . ) that are arranged at spacings (A) from each other and are intersected by ribs (16; 16a, . . . ) or groups of ribs (16, . . . ) also arranged at spacings (A) from each other. Polygonal fields (18a, . . . ) are formed on the surface (12) of the spring body (4) in the gaps between the ribs (14,. . . ; 16, . . . ) according to the angle of intersection.
    Type: Application
    Filed: December 8, 2004
    Publication date: July 12, 2007
    Inventors: Volker Gedenk, Andreas Kropf, Friedrich Hoppmann