Container and closure therefor

Claim 2

In an open mouthed container and cover therefor constructed of plastic, wherein said container has a circumferentially extending projection on its outer wall in the region of the top edge of said container, said projection tapering upwardly, wherein said cover has an inverted U-shaped rim inthe form of a pair of upstanding circumferential sidewalls, and wherein the outer sidewall of said cover has a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off end portion, the improvement comprising means for providing firm clamping and contact pressure between the upper edge of said container and the sidewalls of said cover by having the inner sidewall of said cover with a circumferentially extending bulged portion to maintain pressure contact with the inner wall of said container, said bulged portion being disposed approximately on the level of said projection, and having the outer sidewall of said cover engage the edge of said container firmly above said projection, and an inward projection on said outer sidewall to engage underneath th projection on said container and lock said cover to said container, said inward projection being located in said tearoff end portion and adjacent to said weakening line in said outer sidewall.

Claim 3

The container and cover of claim 1 wherein said cover has a reduced cross-sectional thickness in its outer wall above the projection of said outer wall to thereby form said weakening line.

Claim 4

The container and cover of claim 1 wherein said container is in the form of a polygon.

Claim 5

The container and cover of claim 3 wherein said polygon is a rectangle.

Claim 6

The container and cover of claim 1 wherein said cover outer wall engages the upper edge of said container with a tight elastic fit.

Claim 7

The container and cover of claim 1 wherein the projection of said container wall is triangular.

Claim 8

The container and cover of claim 1 wherein said cover outer wall has a recess and projection shaped to conform with the profile of the edge and projection of said container wall.

Claim 9

In a relatively flexible one-piece molded plastic cover for an open mouthed container, wherein said container has a circumferential extending projection on its outer wall in the region of the edge of said container, wherein said cover has an inverted U-shaped rim in the form of a pair of upstanding circumferential sidewalls, and wherein the outer sidewall of said cover has a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off end portion, the improvement comprising means for providing firm clamping and contact pressure between the upper edge of said container and the sidewalls of said cover by having the inner sidewall of said cover with a circumferential extending bulged portion to maintain pressure contact with the inner wall of said container, said bulged portion being disposed-approximately on the level of said projection, and having the outer sidewall of said cover shaped to engage the edge of said container firmly above said projection, and an inward projection on said outeR sidewall of said cover shaped to engage underneath the projection on said container for locking said cover to said container, said inward projection being located in said tear-off end portion and adjacent to said weakening line in said outer sidewall.

Claim 10

In a relatively flexible one-piece molded plastic cover for an open mouthed container, wherein said container has a circumferential extending projection on its outer wall in the region of the edge of said container, wherein said cover has an inverted U-shaped rim in the form of a pair of upstanding circumferential sidewalls, and wherein the outer sidewall of said cover has a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off end portion, the improvement comprising means for providing firm clamping and contact pressure between the upper edge of said container and the sidewalls of said cover by having the inner sidewall of said cover with a circumferential extending bulged portion to maintain pressure contact with the inner wall of said container, said bulged portion being disposed-approximately on the level of said projection, and having the outer sidewall of said cover shaped to engage the edge of said container firmly above said projection, and an inward projection on said outeR sidewall of said cover shaped to engage underneath the projection on said container for locking said cover to said container, said inward projection being located in said tear-off end portion and adjacent to said weakening line in said outer sidewall.

Claim 11

The cover of claim 8 wherein said outer wall has a reduced cross-sectional thickness above the projection of said outer wall to thereby form said weakening line.

Claim 12

The cover of claim 8 wherein said outer wall is adapted to engage the upper edge of said container with a tight elastic fit.

Claim 13

The cover of claim 10 wherein said outer wall has a recess and projection shaped to conform with the profile of the edge and projection of said container wall.

Claim 14

In a container and cover therefor constructed of plastic wherein the cover is provided with a sidewall depending over the container edge and having a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off end portion, which latter engages underneath a shoulder of a circumferential projection provided on the container wall, the projection tapering off upwardly and ending at a distance from the upper edge of the container wall, the improvement which comprises the provision of a cover constructed as a push-in cover with a depressed bottom and having an inner sidewall penetrating into the container and provided with a circumferentially extending bulged portion disposed approximajely on the level of said projection, said bulged portion being in pressure contact with said inner wall of the container, said cover also having an outer sidewall provided on its inner surface with a recess corresponding in shape essentially to said projection, said recess having a tapering surface serving as a support surface for said projection, the edge portion of said container wall disposed above the projection being held fixed in position in the base portion of a U-shaped recess in the cover defined by the circumferentially extending sidewalls thereof.

Claim 15

In a container and cover therefor constructed of plastic wherein the cover is provided with a sidewall depending over the container edge and having a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off end portion, which latter engages underneath a shoulder of a circumferential projection provided on the container wall, the projection tapering off upwardly and ending at a distance from the upper edge of the container wall, the improvement which comprises the provision of a cover constructed as a push-in cover with a depressed bottom and having an inner sidewall penetrating into the container and provided with a circumferentially extending bulged portion disposed approximajely on the level of said projection, said bulged portion being in pressure contact with said inner wall of the container, said cover also having an outer sidewall provided on its inner surface with a recess corresponding in shape essentially to said projection, said recess having a tapering surface serving as a support surface for said projection, the edge portion of said container wall disposed above the projection being held fixed in position in the base portion of a U-shaped recess in the cover defined by the circumferentially extending sidewalls thereof.

Claim 16

Container according to claim 12, wherein there is provided a stiffening ring serving as a stacking ring projecting from the base of the edge portion of the cover in the upward direction.

Claim 17

Container according to claim 12, wherein the container is constructed essentially in the form of a parallelepiped, the cover being essentially rectangular.

Claim 18

Container according to claim 12, wherein the projection tapers upwardly by an angle of approximately 15* from the vertical.

Claim 19

In a container and cover therefor constructed of plastic, wehrein the cover is provided with a sidewall depending over the container edge and having a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off end portion, which latter engages underneath a shoulder of a circumferential projection tapering off upwardly and ending at a distance from the upper edge of the container wall, the improvement which comprises the provision of a cover constructed as a push-in cover with a depressd bottom and having an inner sidewall penetrating into the container and provided with a circumferentially extending bulged portion disposed approximately on the level of said projection, such bulged portion being in pressure contact with said inner wall of the container, said cover also having an outer sidewall provided on its inner surface with a recess corresponding in shape essentially to said projection, said recess having a tapering surface serving as a support surface for said projection, the edge portion of said container wall disposed above the projection being held fixed in position in the base portion of a U-shaped recess in the cover defined by the circumferentially extending sidewalls thereof, the weakening line in the cover being disposed in the proximity of the shoulder of said projection.

Claim 20

In a container and cover therefor constructed of plastic, wehrein the cover is provided with a sidewall depending over the container edge and having a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off end portion, which latter engages underneath a shoulder of a circumferential projection tapering off upwardly and ending at a distance from the upper edge of the container wall, the improvement which comprises the provision of a cover constructed as a push-in cover with a depressd bottom and having an inner sidewall penetrating into the container and provided with a circumferentially extending bulged portion disposed approximately on the level of said projection, such bulged portion being in pressure contact with said inner wall of the container, said cover also having an outer sidewall provided on its inner surface with a recess corresponding in shape essentially to said projection, said recess having a tapering surface serving as a support surface for said projection, the edge portion of said container wall disposed above the projection being held fixed in position in the base portion of a U-shaped recess in the cover defined by the circumferentially extending sidewalls thereof, the weakening line in the cover being disposed in the proximity of the shoulder of said projection.