Plastic bucket defining annular inwardly projecting ridge and method
OwnerJohn W. von Holdtinventor
Life of this patent
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Abstract
A plastic bucket having a lip which defines means for engaging a bucket lid in sealing relation. The interior wall of the bucket defines an annular, inwardly projecting ridge spaced from the lip. The ridge extends around the inner circumference of the bucket, and defines an annular, inwardly pointed apex, to provide increased hoop strength to the bucket adjacent to its mouth and to provide an internal brush wiping member within the bucket.
Claims8
Apparatus for removing a molded bucket from a mold core which comprises first pneumatic means for pressurizing the space between the respective ends of the bucket and mold core to move said bucket off the core, and valve means for opening and closing said first pneumatic means, said core defining a recess for receiving an inwardly-projecting member of the bucket formed thereon, the improvement comprising, in combination:
- pressurized fluid supply means, and fluid supply channel means communicating through said mold core between said pressurized fluid supply means and the recess to provide the supply of pressurized fluid to circumferentially expand said plastic bucket adjacent said recess, to facilitate its removal from the core by the first pneumatic means, said channel means being of sufficiently narrowed dimension to prevent the substantial flowing of liquid molding compound into it during the molding operation.
Apparatus for removing a molded bucket from a mold core which comprises pusher means for pressing against the bucket interior, for removal of said bucket from the core, said core defining a recess for receiving an inwardly-projecting member of the bucket formed thereon, the improvement comprising, in combination:
- pressurized fluid supply means, and fluid supply channel means communicating through said mold core between said pressurized fluid supply means and the inwardly-projecting member to provide a supply of pressurized fluid to circumferentially expand said plastic bucket adjacent said member, to facilitate its removal from the core by the pusher means, said channel means being of sufficiently narrowed dimension to prevent the substantial flowing of liquid molding compound into it during the molding operation.
Dependencies are inferred from the claim text.