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US 5,350,231 AGranted
Double worm extruder with meshing screws
AssigneeFriedrich Theysohn GmbH
InventorHorst Eigruber
Life of this patent
Estimating the term…
Abstract
A double worm extruder has the ribs of its screws of trapezoidal cross section between divergent flanks to minimize wear of the housing surface.
Claims3
A double-worm extruder, comprising:
- an elongated worm housing having a pair of adjacent laterally overlapping bores extending longitudinally in said housing and defining an open figure-eight cross section therein;
- and
- a respective screw received in each of said bores, said screws being journalled in said housing and having longitudinally extending bodies formed with helical ribs projecting therefrom, the ribs of the screws meshing with one another, said ribs each being of trapezoidal cross section between outwardly diverging flanks.
Dependencies are inferred from the claim text.