Method of making a perforated, molded container
OwnerDavid E. Hillgenberginventor
Life of this patent
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Abstract
Method of making a molded container for potted plants from a sheet of organic polymer, is molded in one piece from a sheet of organic polymer material. Rigidity is provided by a peripheral solid lip formed with a horizontally extending lower surface and convexly curved upper surface. One or more drainage apertures are formed through the bottom wall of the container by limited vertical shearing eliminating waste and permitting adjacent portions to be strengthened and raised to dispose the aperture above a supporting surface. In molding the container, a strap of serrated steel is used to cut through the sheet material to define the outer edge of the container lip.
Claims9
In the molding of a container by forming a softened sheet of organic polymer material between male and female mold parts in which said sheet is disposed over a female die surface arranged on said female mold part to define the side and bottom walls of said container and said male mold part includes a male die surface arranged to close with said female mold part, the improvement for forming a peripheral lip entirely around the top edge of said container, sand improvement comprising:
- providing an annular region on said female die surface for defining a peripheral lip of said container;
- slidably disposing a blade of steel entirely around said male mold part said blade being formed with serrates pointing downwardly and closely adjacent the outer edge of said male mold parts;
- moving said mold parts together to form said container;
- and
- thereafter sliding said blade downwardly so that said serrates tear through said sheet of organic material to define the outer edge of said lip,
- molding said container bottom so as to form at least one platform region displaced inwardly from surrounding portions of the container bottom and perforating said at least one platform region while said material is between said male and female mold parts by moving a punch member relative said mold parts and through said platform regions.
In the molding of a container by forming a softened sheet of organic polymer material between male and female mold parts in which said sheet is disposed over a female die surface arranged on said female mold part to define the side and bottom walls of said container and said male mold part includes a male die surface arranged to close with said female mold part, said improvement comprising:
- moving said mold parts together to reshape said material into the form of a container and molding portions of the container bottom so as to form at least one platform region displaced inwardly from surrounding portions of the container bottom and perforating said at least one platform region while said material is between said male and female mold parts by moving a punch member relative said mold parts and through said at least one platform region.
Dependencies are inferred from the claim text.