Patents by Inventor Bernd Wohletz

Bernd Wohletz 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: 9855710
    Abstract: The present invention relates to a method and an assembly for manufacturing a leaf spring from a fiber-composite material. To this end, tape material from a fiber material, which has been pre-impregnated with a matrix resin, for manufacturing a semi-finished leaf spring is wound under tension onto a winding core, wherein at least two cavities for shaping are configured on the winding core. The tape material here is pressed on by way of a contact pressure means, such that adjacent layers of the fiber material are adhesively interconnected and air pockets are removed. The semi-finished leaf spring under impingement by pressure and heat and under curing of the matrix resin is finally processed to form a leaf spring.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: January 2, 2018
    Assignee: BENTELER SGL GMBH & CO. KG.
    Inventors: Tobias Aubele, Ulrich Mueller, Hannah Paulus, Andreas Steinle, Bernd Wohletz, Ralph Wojtczyk
  • Publication number: 20160114537
    Abstract: The present invention relates to a method and an assembly for manufacturing a leaf spring from a fiber-composite material. To this end, tape material from a fiber material, which has been pre-impregnated with a matrix resin, for manufacturing a semi-finished leaf spring is wound under tension onto a winding core, wherein at least two cavities for shaping are configured on the winding core. The tape material here is pressed on by way of a contact pressure means, such that adjacent layers of the fiber material are adhesively interconnected and air pockets are removed. The semi-finished leaf spring under impingement by pressure and heat and under curing of the matrix resin is finally processed to form a leaf spring.
    Type: Application
    Filed: October 22, 2015
    Publication date: April 28, 2016
    Inventors: Tobias AUBELE, Ulrich MUELLER, Hannah PAULUS, Andreas STEINLE, Bernd WOHLETZ, Ralph WOJTCZYK
  • Publication number: 20120309247
    Abstract: In a method of making a hybrid part, a reinforcement element of fiber composite is placed upon a base member in a press tool. A strip-shaped cover having a resin absorbing absorbent layer is withdrawn from a supply unit and placed in the press tool between the reinforcement element and the press tool. As the base member and the reinforcement element are compressed with one another and joined any resin issuing out from the reinforcement element is absorbed by the absorbent layer of the cover and kept away from soiling the press tool or the base member. After the compression process, the cover is removed.
    Type: Application
    Filed: May 29, 2012
    Publication date: December 6, 2012
    Applicants: Benteler SGL GmbH & Co. KG, Benteler Automobiltechnik GmbH
    Inventors: Markus Kleine, Stefan Willeit, Waldemar Dinius, Otto Buschsieweke, Konstantin Herlach, Bernd Wohletz, Andreas Steinle
  • Patent number: 8070904
    Abstract: In a method of making a body part or chassis part of a motor vehicle, several pre-impregnated fiber materials (prepregs) are stacked on top o one another, with an outermost prepreg intended for attachment to a metallic base body being provided with an adhesive. The stacked prepregs are then shaped into a three-dimensional preform which is then compressed with the base body in a press tool for bonding the preform with the base body and allowing the adhesive to cure, thereby producing a joined structure which is allowed to cure.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: December 6, 2011
    Assignees: Benteler Automobiltechnik GmbH, SGL Carbon AG
    Inventors: Christian Howe, Johannes Böke, Wilfried Rostek, Bernd Wohletz
  • Publication number: 20100051183
    Abstract: In a method of making a lightweight structure composed of a reinforced base element and a reinforcement element, the reinforcement element is fabricated, and the base element is heated by a heat source to a curing or pre-curing temperature. Subsequently the heated base element is joined together with the reinforcement element in a press tool.
    Type: Application
    Filed: August 24, 2009
    Publication date: March 4, 2010
    Applicant: Benteler SGL GmbH & Co. KG
    Inventors: Johannes Böke, Marko Maciej, Florian H. Gojny, Christian Howe, Sebastian Grasser, Bernd Wohletz, Gerhard Heilmeier
  • Publication number: 20080156425
    Abstract: In a method of making a body part or chassis part of a motor vehicle, several pre-impregnated fiber materials (prepregs) are stacked on top of one another, with an outermost prepreg intended for attachment to a metallic base body being provided with an adhesive. The stacked prepregs are then shaped into a three-dimensional preform which is then compressed with the base body in a press tool for bonding the preform with the base body and allowing the adhesive to harden, thereby producing a joined structure which is allowed to cure.
    Type: Application
    Filed: December 11, 2007
    Publication date: July 3, 2008
    Applicants: Benteler Automobiltechnik GmbH, SGL Carbon AG
    Inventors: Christian Howe, Johannes Boke, Wilfried Rostek, Bernd Wohletz
  • Patent number: 5387172
    Abstract: A cylinder or roller for paper, plastic or material webs is formed of a plastic material reinforced with fibers and is used for the purpose of transporting, deflecting or web guiding. Instead of a layer covering the casing and being applied with an electrolytic method or by a thermal spraying method, an abrasion-resistant layer of a synthetic resin and a filler of a powder of abrasion-resistant material is used.
    Type: Grant
    Filed: August 13, 1993
    Date of Patent: February 7, 1995
    Assignee: Sigri Great Lakes Carbon GmbH
    Inventors: Hinrich Habenicht, Bernd Wohletz