B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1074, 18/913
B29C 67/00 (2006.01) B29C 51/00 (2006.01) B29C 51/08 (2006.01) B29C 51/30 (2006.01) B29C 57/12 (2006.01) B29C 65/56 (2006.01)
Patent
CA 1070468
ABSTRACT OF THE DISCLOSURE A method of and apparatus for cold-forming a thermoplastic sheet to provide a circular container part such as a lid or dish comprising the steps of engaging a sheet of thermoplastic material between opposing concen- tric die members, drawing the sheet around the circular edge of one of the die members to provide a concentric central portion and a concentric annular depending skirt having a proximal edge adjacent the central portion, an inter- mediate portion, and a distal free edge, providing an annular void in the die members adjacent the skirt, then moving the free edge toward the proximal edge while holding the proximal edge to buckle the said intermediate portion into the void. In the apparatus, the void has a tapered surface inclining radially outwardly and axially toward the proximal edge to hold the free edge radially inwardly, thereby to permit the intermediate portion to buckle outwardly into the void.
262563
Na
Peerless Machine And Tool Corporation
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