US 4,512,493 A · Molded bucket and lid having high stack strength

Abstract

A molded bucket comprises a bucket lip defining an enlarged annular projection at the mouth of the bucket; an inwardly positioned annular shelf facing the mouth adjacent the lip; and an outwardly positioned annular flange joined to said bucket adjacent the annular shelf to provide extra hoop strength to the area of the shelf. The lid for the bucket defines an annular recess receiving the annular projection of the bucket lip in locking relation and an annular straight wall which extends radially inwardly from the recess, at an angle of essentially 10.degree. to 60.degree. from the axis of the bucket, with the inner edge extending outwardly toward the mouth relative to the outer edge. The angled annular straight wall serves as a cantilever beam to transmit stacking force to the annular shelf, so that the bucket does not distort or collapse under conditions of high stacking, the bucket being preferably a tapered bucket.

Claims9

Dependent claims

A lid for removable attachment to a molded bucket comprising:

said lid defining a peripheral, annular recess adapted to receive the annular projection of a bucket in locking relationship;
said annular recess being formed by an internal annular portion and an external skirt portion lying in radial spaced relation thereto, said recess and skirt portion being joined by an intermediate portion defining said recess;
said skirt portion having a lower detachable strip extending generally continuously about the bottom edge of said skirt portion to retain said lid against removal of said skirt portion;
and
said detachable strip being removable by being physically severed at a break area, said strip being capable of being manually detached from said skirt upon being severed for removal of said lid;
wherein said lid includes a pair of spaced, approximately annular walls, and a plurality of strengthening ribs disposed between said walls, said ribs being disposed diagonally to form side-by-side V-shaped formations.

3 more elements

Dependencies are inferred from the claim text.

Molded bucket and lid having high stack strength

Life of this patent

Molded bucket and lid having high stack strength

Life of this patent

Abstract

Claims9