Patents by Inventor Ewald Wachs

Ewald Wachs 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: 4864822
    Abstract: A control device for a hydrostatic drive for at least two actuators having a variable displacement pump whose adjusting device can be acted on as a function of the displacement and/or of the delivery pressure, wherein a control valve is associated with each actuator in its hydraulic supply line and the delivery flow for each actuator is determined by means of a pressure compensator as a function of the valve preset at the control valve, is simplified while ensuring accurate control. This is achieved by having the adjusting device always set the pump at a displacement which is slightly less than the sum of the actual instantaneous volume flows required by the actuators.
    Type: Grant
    Filed: January 22, 1988
    Date of Patent: September 12, 1989
    Assignee: Hydromatik GmbH
    Inventors: Ewald Wachs, Ludwig Wagenseil, Wolfgang Reistle