Apparatus for forming double thickness fins in a thin wall plastic container

Claim 1

MOLD INSERT MEANS FOR A SHEET MATERIAL MOLD COMPRISING GUIDE AND RETAINING MEANS HAVING A PREDETERMINED AXIS, A PLURALITY OF MOVABLE MOLD MEMBERS MOUNTED ON SAID GUIDE AND RETAINING MEANS FOR LIMITED MOVEMENT THEREON RELATIVE TO EACH OTHER AND TO SAID GUIDE AND RETAINING MEANS, SAID MOLD MEMBERS DEFINING A CLOSED FIGURE IN SPACE PRESENTING A MOLD SURFACE WHEN SAID GUIDE AND RETAINING MEANS ARE DISPOSED IN THEIR INITIAL POSITION PRIOR TO MOVEMENT THEREOF IN A DIRECTION TRANSVERSE TO SAID AXIS, EACH OF SAID MOLD MEMBERS COMPRISING ONE QUADRANT OF A CONICAL FIGURE AND DISPOSED IN STEPPED RELATIONSHIP TO EACH OTHER AS MEASURED ALONG SAID AXIS, MEANS BIASING SAID MOLD MEMBERS TO A FIRST PREDETRMINED POSITION WHEREBY SURFACES ON EACH OF SAID MOLD MEMBERS ARE SPACED IN OPPOSITION TO SURFACES ON THE NEXT ADJACENT MOVABLE MEMBER, MEANS OPERABLE TO MOVE SAID MOVABLE MEMBERS AGAINST SAID BIAS TO CAUSE SAID SURFACES ON SAID MOVABLE MEMBERS TO MOVE CLOSER TO EACH OTHER IN A DIRECTION PARALLEL TO THE AXIS OF SAID GUIDE AND RETAINING MEANS, AND MEANS FOR MOVING SAID GUIDE AND RETAINING MEANS AND THEREBY SAID MOVABLE MEMBERS AS A UNIT IN A DIRECTION TRANSVERSE TO THE AXIS OF SAID GUIDE AND RETAINING MEANS WHEREBY SAID MOVABLE MEMBERS MAY SQUEEZE SHEET MATERIAL LOCATED AGAINST SAID SURFACES IN OPPOSITION TO EACH OTHER TOWARD EACH OTHER AND SAID MOVABLE INSERT MEMBERS MAY THEN BE MOVED OUT OF CONTACT WITH SAID SHEET MATERIAL.