Receptacles – Sidewall structure – Contoured sidewall
Reexamination Certificate
1997-11-24
2001-08-07
Shoap, Allan N. (Department: 3727)
Receptacles
Sidewall structure
Contoured sidewall
C206S519000, C220S324000
Reexamination Certificate
active
06269967
ABSTRACT:
The invention relates to a plastic container of an essentially rectangular shape, comprising a bottom, upright side walls connecting to the bottom and having essentially equal wall thicknesses and an outward beaded top edge on which the edge of a cover which closes the container can be fixed.
Such a container is known in many embodiments and is used, closed by a cover, for the storage and transportation of products of all kinds. In general, the walls and the bottom of the container are relatively thin, in order to keep the weight of the container low. However, the disadvantage of this is that the stability and sturdiness of the container, particularly when it is a large container, leave something to be desired.
This is a disadvantage in particular if the container is intended for the storage and/or transportation of powdered materials, such as tetrafluoroethylen powder, which are sensitive to compressive stresses as the result of, for example, shocks and vibrations. Such powdered materials, which have to be processed in, for example, a fluidized state, can go lumpy under the influence of even slight compressive stresses, and thereby become unusable. Said materials are generally also sensitive to moisture. Until now, said materials have therefore been stored and/or transported in round containers or drums, which are stable per se and can be closed well with a cover (see U.S. Pat. No. 4,674,650). However, when round containers are used, a large amount of wasteful space occurs between containers which are placed next to each other.
The object of the invention is to provide a container of the type mentioned at the beginning, which has sufficient stability and sturdiness and is suitable for the storage and/or transportation of sensitive powdered materials.
This object is achieved according to the invention through the fact that each upright side wall is divided in he vertical direction of the container into two interconnecting side wall parts, the lower side wall part being made curved towards the inside of the container (concave) and the upper side wall part being made curved towards the outside of the container (convex), and the upper and the lower side wall part being connected to each other by an intermediate part.
The special shape of the vertical side walls produces a very stable container. In fact, the upper and the lower side wall part have the tendency to buckle in different directions when under stress. However, since the two side wall parts are interconnected, the side wall in question will not buckle in either of the two directions.
The invention also relates to a cover for a container according to the invention, which cover has a peripheral edge which can grip over the beaded top edge of the container, and which cover is characterized in that at the rectangular sides it is provided with clamps which by way of hinges, preferably film hinges, are connected to the peripheral edge of the cover and can hook under the top edge of the container.
Due to the clamps, the cover according to the invention can be fixed easily and firmly on the container. The desired seal between the cover and the container can be obtained by a circumferential resilient lip which is known per se, and which is fitted in the peripheral edge of the cover and interacts with the top edge of the container.
Preferred embodiments of the container and the cover according to the invention are described in claims
2
to
5
and
6
to
8
respectively.
Finally, the invention relates to a combination of a container and a cover according to the invention.
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Blank Rome Comisky & McCauley LLP
Merek Joe
Shoap Allan N.
Wavin Trepak, B.V.
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