Blow molding machine

Claim 1

A blow molding machine comprising a base, an extruder mounted above said base at an extruding station and having means for continuously extruding a tubular parison, extruding parison severing means at said station, a table mounted on said base below said extruder for limited vertical movement between upper and lower positions, a pair of mold sections mounted on said table for transverse movement, means for moving said mold sections between clamped and unclamped positions, a blow pin mounted on said table and transversely spaced from said extruder at a blow molding station, means for moving said mold sections to said extruding station and moving the mold sections while at said extruding station to their clamped positions so as to engage a parison, means for moving said table from its upper to its lower position, means for severing said parison with said severing means and means for moving said mold sections toward said blow molding station, simultaneously with said table movement, means for thereafter raising said table, means for causing said blow pin to expand said parison in said mold sections, means for moving said mold sections to their unclamped positions, means for returning said mold sections to said extruding station, said means for raising and lowering said table comprising two pairs of links at the opposite ends of said table, each pair of links having one end pivotally connected to said frame and the other end connected to said table, whereby said table will have slight forward and rearward movement during its raising and lowering motions, a pair of torsion bars secured between intermediate portions of each pair of links, two crank arms secured to said torsion bars, and reciprocating motor means connected to the outer ends of said crank arms.