method and device for the manufacture of a einschubmuffe

摘要

997,552. Moulding tubes having widened ends. A. WIEDENOFF, [trading as KUNSTSTOFFWERK GEB. ANGER G.m.b.H. & CO.] Jan. 15, 1962 [Nov. 22, 1961], No. 16335/64. Divided out of 997,551. Heading B5A. A widened portion is produced in the vicinity of the end of a tube of plastics material by pushing and consolidating the tube end over a collapsible core and subsequently collapsing the core and removing it. The tube 8, Fig. 1, to be widened is gripped in a chuck 6, and its end heated by a device 22 (Fig. 3, not shown), to soften it and then pushed over a lubricated core 2 having an annular beading 23. A sizing cylinder 3 is now moved over the tube end by an hydraulic cylinder 16. The exposed portion of the tube 8 is now cooled by a liquid spraying device (not shown) and the cylinder 3 removed from the tube end which is similarly cooled. Finally, the core 2 is collapsed by the actuation of an hydraulic cylinder 18 which withdraws a core portion 41, Fig. 6, carrying pivoted segments 37 from a core portion 30 carrying pivoted segments 35 adapted to interleaf with the segments 37.