Patents by Inventor Harald Wohlfahrt

Harald Wohlfahrt 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).

  • Device for limiting the prestress of a control spring
    Patent number: 5924443
    Abstract: A device for limiting the prestress of a control spring (17) which is particularly well-suited for pressure control valves and similar equipment, the control spring (17) being located in a spring housing (15) and supported on a spring plate (18) which can be adjusted by means of a rotating adjustable spindle (19) that is provided with a thread for prestressing the control spring (17), includes an end stop (22), which, by means of its own adjusting device which can be operated from outside the spring housing (15), can be adjusted and locked at any desired location between two end positions. When the spring plate (18) is moved in the direction which increases the prestress of the control spring (17), the spring plate (18) makes contact with the locking end stop (22), as a result of which the prestress of the control spring (17) is restricted to the preselected value.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: July 20, 1999
    Assignee: Hygrama AG
    Inventor: Harald Wohlfahrt