Receptacles – Closures – Secondary closure within parameter of primary closure
Patent
1994-08-10
1997-06-03
Shoap, Allan N.
Receptacles
Closures
Secondary closure within parameter of primary closure
220908, 220293, 220298, 220303, B65D 5118, B65F 116
Patent
active
056345666
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a cover for a waste container consisting of a cover plate with peripheral wall which fits onto the standing upper rim of the container, in which cover plate is recessed a circular opening which is closable by a circular lid, wherein an outer peripheral wall of the lid and the inner periphery of the recess have co-acting cams for locking the lid in the recess.
2. Prior Art
The waste containers as referred to above are normally used for receiving waste for burning because of the infectious nature thereof. This is usually hospital waste, and such a container is filled up gradually. For this purpose the cover for the container can be placed in two positions, that is, a temporary position in which the cover can be lifted from the container in order to fill the container, as well as a permanent position wherein the cover is fixed permanently on the container which when filled is placed in an incinerator. The cover is moreover embodied with an additional opening which can be closed and which serves for admitting small amounts of waste and for monitoring the contents. In this case the entire cover does not have to be lifted. The present invention relates particularly to this small closable opening.
It is customary to give this opening a circular form and close it by means of a circular lid. This lid also has to be placed in different positions, in particular a temporary one in which the lid part can easily be detached again, wherein the additional requirement is made that the lid part serves as hand-grip to enable lifting of the wholly or partially filled container and moving thereof into a definitive closing position.
Heretofore it has been difficult to embody the closure of the lid part in the circular hole of a cover such that it suffices for the temporary and permanent closure and the carrying function thereof.
The invention has for its object to improve the closure of the lid part in the cover such that the above stated drawbacks are obviated.
SUMMARY OF THE INVENTION
The cover according to a first embodiment of the invention is distinguished in that the cams on the lid are formed like flexible hooks, cooperating with a plurality of co-acting cams on the cover, said co-acting cams are arranged in rows on different levels.
The cover according to a second embodiment is distinguished in that the cams are elongate and are disposed sloping relative to the line of symmetry of the lid such that an opening is formed between the one end of a cam and the other end of the adjacent cam, which opening serves for passage of the co-acting cam, wherein the axially oriented lower surface of the one cam in addition to the opposite axial surface of the other co-acting cam have indentations for defining different closing positions of the lid in the cover plate.
Due to the slopingly disposed cams the lid can be fixed temporarily to the cover through a small rotation relative thereto. The indentations prevent a counter-rotation of the lid in relation to the cover when the lid is lifted, whereby the cover could unexpectedly come loose of the lid part and waste possibly spill out of the container. A further rotation of the lid part will effect a more permanent closure.
In a further development of the cover according to the invention the other end of the co-acting cam is embodied in a hook form and co-acts with a resilient counter-member of the one cam so that a permanent hooking of the cams into one another is brought about when the lid part is rotated further, whereby a permanent closure results.
BRIEF DESCRIPTION OF THE DRAWINGS
Above mentioned and other features will be further elucidated in the figure description hereinbelow of two embodiments. In the drawing:
FIG. 1 shows a perspective view of a container provided with a cover according to the present invention;
FIGS. 2a-2e show partly broken away detail views of a cover with a lid which is provided with cams according to a first embodiment of the invention;
FIGS. 2aa-2ee show cross sectional
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Jansen Cornelis J.
Schilthuizen Stephanus F.
Newhouse Nathan
Shoap Allan N.
Wiva Verpakkingen B.V.
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