Patents Assigned to Wavin B.V.
  • Patent number: 3960062
    Abstract: A band of bags of plastic material connected with each other by perforation lines. In the two end parts of each perforation line the number of perforations and/or the width of the perforations per unit of width is greater than in the central part of the perforation line. A device for manufacturing said band of bags comprises a perforating member with equidistantly spaced first perforating pins and second perforating pins are present on either side of a central area between the first perforating pins.
    Type: Grant
    Filed: September 30, 1974
    Date of Patent: June 1, 1976
    Assignee: Wavin B.V.
    Inventor: Arnoldus Willem Jan Leloux
  • Patent number: 3947000
    Abstract: An extruder for synthetic material with at least two mixing and conveying worms, comprising an extruder housing, an extruder inlet, a driving member for driving one of the worms and a gearing for driving the second worm, said gearing comprising two gear wheels with inclined toothings. These gear wheels are mounted on either side of the mixing and conveying worm and cooperate therewith.
    Type: Grant
    Filed: March 6, 1974
    Date of Patent: March 30, 1976
    Assignee: Wavin B.V.
    Inventor: Warner Jan de Putter
  • Patent number: 3945621
    Abstract: Extruder, especially a multi-worm extruder with a housing and one or more mixing worms with associated shaft, as well as at least one hydrostatic bearing for absorbing the axial load of the conveying and mixing worm. A slit between a bearing disc on the worm shaft and a counter bearing ring can be filled with oil via a pipe connected to a pump, radial sealings preventing the oil from escaping between the gliding faces of the bearing, whereas the said counter bearing ring is rotatably supported in the extruder housing.
    Type: Grant
    Filed: February 15, 1974
    Date of Patent: March 23, 1976
    Assignee: Wavin B.V.
    Inventors: Willem Cornelis den Hertog, Geert Rolleman
  • Patent number: 3943273
    Abstract: A conducting plastic pipe system comprising a male plastic pipe part and a female plastic pipe part with conducting covering layers which are interconnected by means of a conducting sealing ring between the male and female part. In case of outer covering layers on the pipe part the covering layer extends onto the inner side of the muff end of the female pipe part.
    Type: Grant
    Filed: March 4, 1974
    Date of Patent: March 9, 1976
    Assignee: Wavin B.V.
    Inventor: Warner Jan de Putter
  • Patent number: 3938834
    Abstract: Pipe connection for plastic pipes comprising two penetrating pipe parts and a receiving pipe part, which is provided with corrugations at each end. The radius of curvature or the height of the corrugations decrease from each end to the centre part of the receiving pipe part.
    Type: Grant
    Filed: April 20, 1973
    Date of Patent: February 17, 1976
    Assignee: Wavin B.V.
    Inventor: Albertus Antony Oostenbrink
  • Patent number: 3931853
    Abstract: Device for the supply and discharge of cooling liquid in the worms of an extruder press, the worm or worms being situated at some distance from the housing, being provided with a stationary sleeve with a stationary centering ring near both ends thereof and rotatable adjusting rings on each of its sides. The sleeve is furnished with at least two circular chambers, which are delimited by sealing rings, these chambers being in open communication with cooling liquid channels in the worm shaft and which are each connected with an external supply and discharge pipe for the cooling liquid, while part of the sleeve comprises oil holes and overflow openings.
    Type: Grant
    Filed: October 16, 1973
    Date of Patent: January 13, 1976
    Assignee: Wavin B.V.
    Inventor: Warner Jan de Putter