Apparatus for welding thermo-plastic forms

Claim 1

AN APPARATUS COMPRISING, IN OPERABLE COMBINATION, FIRST MEANS SUPPORTING ONE PORTION OF A THERMOPLASTIC FORM, SECOND MEANS SUPORTING ANOTHER PORTION OF SAID THERMOPLASTIC FORM TO BE HEAT SEALED TO SAID ONE PORTION, SAID FIRST MEANS SUPPORTING ONE PORTION OF SAID FORM AND SAID SECOND MEANS SUPPORTING ANOTHER PORTION OF SAID FORM BEING POSITIONED ALONG A COMMON VERTICALLY POSITIONED AXIS, SAID FIRST MEANS SUPPORTING ONE PORTION OF FORM BEING POSITIONED ABOVE SAID SECOND MEANS SUPPORTING ANOTHER PORTION OF FORM WITH CORRESPONDING SURFACES OF THE PORTIONS OF THERMOPLASTIC FORM TO BE SEALED TOGETHER FACING EACH OTHER, SAID FIRST AND SECOND MEANS BEING CONTAINERS SO SHAPED AS TO BE FULLY CLOSED WHEN THE RESPECTIVE PORTIONS OF THERMOPLASTIC FORM ARE POSITIONED THEREIN IN SEALING POSITION, VACUUM PRODUCING MEANS COMMUNICATING WITH EACH OF SAID FIRST AND SECOND MEANS FOR RETAINING SAID PORTIONS OF FORM IN SEALING POSITIONS THEREIN, AIR PRESSURE PRODUCING MEANS ALSO IN COMMUNICATION WITH SAID FIRST AND SECOND MEANS FOR PRESSURING SAID PORTIONS OF THERMOPLASTIC FORM FROM SAID FIRST AND SECOND MEANS SUBSEQUENT TO SEALING SAID PORTIONS TOGETHER, SAID FIRST MEANS BEING RECIPROCABLY MOVABLE ALONG SAID AXIS, THIRD MEANS ATTACHED TO SAID FIRST MEANS TO RECIPROCATE SAME, A SOURCE OF HEAT, FOURTH MEANS POSITIONED TO MOVE SAID SOURCE OF HEAT INTO HEATING POSITION INTERMEDIATE THE SURFACE OF SAID PORTIONS OF FORM TO BE SEALED AND TO WITHDRAW SAID SOURCE OF HEAT.