Patents by Inventor Johan H. Volbeda

Johan H. Volbeda 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).

  • Rotary cutter head with jet flushing blades
    Patent number: 4327507
    Abstract: A cutter having a plurality of cutting blades for a suction-dredger which in operation is driven into rotation so that said cutting blades are capable to cut loose the soil which, mixed with water is subsequently sucked up by means of suction tube, one or more nozzles being provided on each cutting blade, at the back of its cutting edge so that the fluid jet ejected from the nozzles of a cutting blade pretreats the soil portion to be cut loose by the next cutting blade.
    Type: Grant
    Filed: May 28, 1980
    Date of Patent: May 4, 1982
    Assignee: Hollandsche Aanneming Maatschappij B.V.
    Inventor: Johan H. Volbeda
  • Tooth positioning arrangement for an underwater soil cutting head
    Patent number: 4135318
    Abstract: A generally conical cutting head for an underwater dredger includes a plurality of helical cutting arms 1 having teeth 4 mounted thereon. The arms are fixed at one end to a hub 2 and at the other end to a base ring 3. The tooth spacing between the respective cutting arms is arranged in a multi-staggered configuration whereby each tooth removes a symmetrical piece of soil and is not subjected to loads parallel to the local section of the contour line 5'.
    Type: Grant
    Filed: June 28, 1976
    Date of Patent: January 23, 1979
    Assignee: Hollandsche Aanneming Maatschappij B.V.
    Inventor: Johan H. Volbeda