Patents by Inventor Horst Spielhoff

Horst Spielhoff 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: 4234298
    Abstract: Apparatus for removing a cylinder forming the whole or part of the cylinder of a screw extruder, comprising a supporting arm on one end of which the cylinder is pivotally supported, and a further supporting arm to one end of which the other end of said supporting arm is pivoted, the other end of said further supporting arm being pivotally mounted on a base of the screw extruder. Adjusting means may be provided between the cylinder and the outer support arm to adjust the height and inclination of the cylinder, such adjusting means preferably comprising a plate on the support arm, three adjusting set screws in the plate to bear against the cylinder and securing screws to hold the cylinder in the set position.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: November 18, 1980
    Assignee: Hermann Berstorff Maschinenbau GmbH
    Inventor: Horst Spielhoff
  • Patent number: 4192617
    Abstract: A screw extruder for processing rubber or plastics material, comprising a cylinder jacket with a feed hopper, a central geared shaft and geared planet shafts disposed between the central shaft and the cylinder jacket and drivably engaged with the central shaft and the cylinder jacket, wherein parts of at least some of the planet shafts are bare of gearing.Advantageously each alternate planet shaft is only partly geared, the gearing extending for only approximately half the length of the shaft, at one end or the other end or in two quarter length portions at the opposite ends. Alternatively each third planet shaft is only partly geared.Preferably each geared part of a planet shaft which is only partly geared overlaps with a geared part of the planet shaft which follows it in the direction of rotation.
    Type: Grant
    Filed: April 20, 1978
    Date of Patent: March 11, 1980
    Assignee: Hermann Berstorff Maschinenbau GmbH
    Inventor: Horst Spielhoff
  • Patent number: 4176967
    Abstract: Apparatus for the preparation and extrusion of plastics material or rubber, comprising a planet rolling extruder and a feed portion disposed upstream thereof with a main shaft of the planet rolling extruder being surrounded by planet shafts and being driven jointly with a feed-screw of the feed portion, in which some of the planet shafts at their ends adjacent the feed-screw are reduced in section to form transfer shaft portions and thereby receiving chambers for material fed to the planet rolling extruder by the feed portion. The transfer shaft portions may be cylindrical with a diameter smaller than the diameter of the root circle of the planet shaft gearing or may have, adjacent the feed-screw, a diameter smaller than the root circle of the planet shaft gearing and increase in diameter in a direction away from the feed-screw until they achieve the full shaft outline.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: December 4, 1979
    Assignee: Hermann Berstorff Maschinenbau GmbH
    Inventors: Heinz Brinkmann, Horst Spielhoff