Constant heat sealer

Claim 1

A CONSTANT TEMPERATURE DEVICE FOR HEAT SEALING LAYERS OF THERMOPLASTIC FILM TO ITSELF COMPRISING IN COMBINATION A SEALING BODY OF HEAT CONDUCTING MATERIAL, SAID BODY INCLUDING AN UPPER HORIZONTALLY DISPOSED FLAT SURFACE, A LOWER LONGITUDINALLY CONVEX SEALING SURFACE AND VERTICALLY DISPOSED SIDE WALL PORTIONS, AN INVERTED U-SHAPED COVER PLATE FOR THE INTERMEDIATE PORTION OF SAID BODY, THE UPPER PORTIONS OF SAID SIDE WALL PORTIONS BEING RECESSED FOR THE RECEPTION OF THE EXTREMITIES OF THE DEPENDING LEGS OF SAID COVER PLATE, AN UPWARDLY DIRECTED CENTRALLY LOCATED BRACKET MOUNTED UPON THE UPPER SURFACE OF SAID SEALING BODY ADJACENT EACH EXTREMITY THEREOF AND A LONGITUDINALLY DISPOSED HANDLE EXTENDING IN PARALLEL RELATIONSHIP SUBSTANTIALLY THE ENTIRE LENGTH OF SAID BODY SECURED BETWEEN THE UPPER FREE EXTREMITIES OF SAID BRACKETS, AN ELECTRICAL HEATING ELEMENT MOUNTED WITHIN SAID BODY FOR HEATING THE SAME, MEANS FOR SUPPLYING ELECTRICAL ENERGY TO SAID HEATING ELEMENT, THERMOSTATIC MEANS MOUNTED UPON THE UPPER SURFACE OF SAID BODY FOR CONTROLLING THE TEMPERATURE THEREOF, SAID THERMOSTATIC MEANS INCLUDING AN ADJUSTABLE CONTROL WHICH PROJECTS THROUGH AN APERATURE PROVIDED IN THE UPPER FACE OF SAID COVER PLATE, AND MEANS FOR DETACHABLY SECURING SAID COVER PLATE TO SAID BODY, SAID SEALING FACE BEING PROVIDED WITH A PLURALITY OF SPACED PARALLEL GROOVES OF SUBSTANTIAL DEPTH DEFINING A PLURALITY OF RELATIVELY NARROW CONVEX SEALING RIBS DISPOSED IN PARALLEL RELATIONSHIP AND EXTENDING THE FULL LENGTH OF SAID SEALING FACE.