Patents Assigned to Upo Osakeyhtio
  • Patent number: 4015923
    Abstract: A device for producing expansions and in particular inside grooves, such as packing grooves, in plastics pipes and pipe components. The device comprises a form ring for shaping the inside profile of the expansion, the circumference of which ring is divided into two groups of segments, which can be shifted radially inwards so that the form ring can be disassembled and removed from the pipe after shaping of the expansion, a mandrel that can be shifted axially through the form ring, a core body that surrounds the mandrel and in relation to which the mandrel can be shifted axially, and two groups of first inclined faces, in connection with the mandrel, one face group for each segment group, so as to produce radial movement of the segments, for example by forcible controlling, whereby the first group of inclined faces is arranged axially at a distance from the second group of inclined faces.
    Type: Grant
    Filed: January 5, 1976
    Date of Patent: April 5, 1977
    Assignee: Upo Osakeyhtio
    Inventors: Ilkka Jarvinen, Erkki Salmela, Antero Kaikkonen