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US 4,342,799 AGranted
Hollow bodies and their manufacture
AssigneeKautex-Maschinebau GmbH
InventorHans-Joachim Schwochert
Life of this patent
Estimating the term…
Abstract
A blow-moulded hollow body has an insert anchored in a wall of the hollow body by wall portions which penetrate openings in a projecting portion of the insert from both sides during the blow-moulding process and which are welded together at these openings. A wall portion of the hollow body is afterwards cut away to form an access opening and the insert is adapted to receive a closure cap for this opening. In another embodiment, the insert has a carrying handle attached thereto.
Claims18
A method of making hollow bodies, comprising the steps of:
- providing a blow-mold having an inner surface conforming to a desired external shape for the hollow body, the inner surface having at least one continuous area;
- providing an insert with an extending portion having at least one opening therein, the insert to be attached to the hollow body at the continuous area, the opening being aligned substantially perpendicular to the extending portion;
- supporting the insert at the inner surface of the blow-mold in the continuous area, said extension extending inwards toward the hollow body, and said at least one opening defining an axis substantially parallel to the continuous inner surface of the mold and,
- expanding a thermoplastic parison in the blow-mold and, during said expansion, causing wall portions of the parison to penetrate said at least one opening from opposite sides and to become heat-sealed together at said at least one opening and to enclose the regions of the insert surrounding the openings so as to produce a positive joint between the insert and the thermoplastic material.
1 more element
A hollow body comprising:
- a continuous wall portion made of thermoplastic material;
- at least one insert;
- and,
- means positively securing said insert to said hollow body wall, said securing means comprising at least one opening in said insert, the at least one opening being in a part of the insert disposed substantially perpendicular to and intersecting the hollow body wall, the at least one opening defining an axis substantially parallel to the wall, and portions of the material forming said wall penetrating said at least one opening, said portions being heat-sealed together at and adjacent said opening, whereby regions of the insert surrounding such openings are embraced by said wall material portions.
1 more element
Dependencies are inferred from the claim text.