Patents by Inventor Ralf Lohmann

Ralf Lohmann 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: 6848641
    Abstract: An actuating valve has two relay valves connected to a compressed air source and a pneumatic cylinder with two pressure chambers. When one relay valve is actuated, one pressure chamber is pressure-loaded and the other is relieved. Two 3/2 port directional control valves are arranged upstream of the pneumatic cylinder. Two check valves are positioned in branch lines connecting the relay valves and the directional control valves. A control line connects the branch line to the other directional control valve, respectively. The directional control valves are moveable between a first position allowing compressed air to pass and a pressure relief position. When the relay valves are inactive, the directional control valves are in the first position and the relay valves are in a venting position for the branch lines. When one relay valve is actuated, it assumes a position allowing passage of air to the branch line connected to it.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: February 1, 2005
    Assignee: Volkmann GmbH
    Inventors: Ralf Lohmann, Georg Heinen, Jörg Zischewski
  • Publication number: 20030201355
    Abstract: An actuating valve has two relay valves connected to a compressed air source and a pneumatic cylinder with two pressure chambers. When one relay valve is actuated, one pressure chamber is pressure-loaded and the other is relieved. Two 3/2 port directional control valves are arranged upstream of the pneumatic cylinder. Two check valves are positioned in branch lines connecting the relay valves and the directional control valves. A control line connects the branch line to the other directional control valve, respectively. The directional control valves are moveable between a first position allowing compressed air to pass and a pressure relief position. When the relay valves are inactive, the directional control valves are in the first position and the relay valves are in a venting position for the branch lines. When one relay valve is actuated, it assumes a position allowing passage of air to the branch line connected to it.
    Type: Application
    Filed: April 25, 2003
    Publication date: October 30, 2003
    Applicant: Volkmann GmbH
    Inventors: Ralf Lohmann, Georg Heinen, Jorg Zischewski
  • Patent number: 6484963
    Abstract: A winding frame is provided which is swingably mountable on a machine frame and operable to support a rotatably driveable winding core for the winding of a filament thereon. The winding frame includes a damping apparatus for opposing unscheduled swing movements of the winding frame during regular winding of a filament onto the winding core.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: November 26, 2002
    Assignee: Volkmann GmbH
    Inventor: Ralf Lohmann