BOTTOM END STRUCTURE FOR PLASTIC CONTAINERS

• US 3,598,270 A
• Filed: 04/14/1969
• Issued: 08/10/1971
• Est. Priority Date: 04/14/1969
• Status: Expired due to Term

• Current Assignee: Adomaitis Domas, Howard M. Turner
• Original Assignee: Adomaitis Domas, Howard M. Turner
• Inventors: ADOMAITIS DOMAS, Turner, Howard M.
• Application Number:
  US04/815,745
• Time in Patent Office: 848 Days
• US Class Current: 215/375
• CPC Class Codes: B65D 1/0284 having a discontinuous contact surface, e.g. discrete feet

Abstract

This disclosure relates to a plastic container, particularly a bottle suitable for carbonated beverages. The bottom end of the container comprises portions conformed to meridian elements of a hemisphere with a downward pole and a plurality of hollow legs terminating in feet in a plane below the pole of the hemisphere. In blow-molding the bottle, the mold halves pinch the bottom end of the parison closed along an arcuate weld line constituting the midportion of a semicircular element of a hemispherically contoured portion of the bottom.

Claims

1. A blow molded plastic container having a tubular body terminating at a generally hemispherical outwardly convex bottom wall with a lowermost polar portion, said bottom wall being interrupted by a plurality of downwardly projecting wall portions defining hollow legs with adjacent legs being spaced from each other by meridian wall portions of said bottom wall, at least two of said meridian wall portions being disposed in generally diametrically opposed relationship, and said two meridian walls having a common parison weld along an arc of a radius equal to that of said hemispherical bottom wall.

2. The blow molded plastic container as defined in claim 1 wherein said hollow legs terminate in feet having radially inwardly directed apex wall portions, and said apex wall portions and said at least two meridian wall portions merge at said polar portion.

3. The blow molded plastic container as defined in claim 2 wherein said tubular body has a sidewall merging at a peripheral juncture with said bottom, and said parison weld is completely Inboard of and substantially spaced from said peripheral juncture.

4. The blow molded plastic container as defined in claim 1 wherein said tubular body has a sidewall merging at a peripheral juncture with said bottom, and said parison weld is completely inboard of and substantially spaced from said peripheral juncture.

5. In a plastic container having a cylindrical lowermost side wall portion, an integral bottom end defined by a wall comprising first portions generally conformed to meridian elements of a common hemisphere having a radius which is substantially equal to that of said sidewall portion and having a downward pole, said first portions extending upward from said pole, other wall portions defining hollow legs terminating below said first portions in feet spaced around said end in the lowermost plane of said container, said first wall portions include at least one pair of petaloid portions oppositely extending from a polar wall portion, said legs alternating with said petaloid portions in series around said end, and a pair of opposed sidewalls of each said leg diverging upward and radially outward relative to said polar portion.

6. The invention as defined in claim 5 including wall portions defining gussets extending from said polar portion to said feet.

7. The invention as defined in claim 5 wherein adjacent ones of said sidewalls of adjacent ones of said legs join each other and the upper end of one of said petaloid portions at points along said cylindrical sidewall portion.

8. The invention as defined in claim 5 including a weld at said polar portion recessed above a plane through terminal lowermost walls of said hollow legs.