Receptacles – Closures – Removable closure retained by ductile in situ deformation
Patent
1980-12-09
1982-08-31
Hall, George F.
Receptacles
Closures
Removable closure retained by ductile in situ deformation
220DIG19, B65D 4116, B65D 4118
Patent
active
043468160
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The utilization of drums of all kinds is well known, whether it is a question of storing, or transporting solid or liquid products.
In all cases, and regardless of the dimensions of the different models, the drum is composed of a body which is generally cylindrical and often fluted, a bottom which is often convex and a top that is generally flat.
These different parts are assembled in such a way that the drum may be, in principle, hermetically sealed, the openings usually being located on the upper flat plate, in the form of, for example, two screw bungs with a threaded plug.
However, the part called the "upper flat" is in fact assembled in a recess with respect to the cylindrical walls of the drum, and thus constitutes a sort of upper tray, or depression, more or less deep, depending on the types of drums.
The drums are often made of metal and are used to store products such as lubricants. When the drums are stored outside, or are temporarily exposed to bad weather, or even during transport, thus upper tray, or depression, constitutes a reservoir for rainwater. Without any device for keeping it from so collecting, the water may, after a period of time, penetrate and infiltrate the metallic drum, with the risk of alterating the quality of the products, the lubricants for example, which are therein stored.
There is thus a technical risk for the manufacturer who stores and delivers his products in metallic drums of having to face complaints from his customers in the event such alteration by infiltration occurs, or that it might have occurred at any moment whatsoever before the drums containing the products were delivered to the customers.
SUMMARY OF THE INVENTION
The object of the present invention is to remedy the above-mentioned disadvantages and to assure a reinforced and complete protection of the products stored in drums. It alludes in particular to a device capable of covering the upper part of the drum hermetically by means of a clippable end cover, preferably made of a plastic material, in such a way that for its fitting and removal this end cover does not require any supplementary device, such as metallic bandings, or the like, and that, even when exposed to bad weather, water cannot penetrate between the end cover and the metallic part of the drum, and even less remain inside.
Thus, essentially, the object of this invention is to provide an end cover of synthetic resin whose diameter corresponds to the diameter of the drum to be covered and protected. The periphery of this end cover presenting, coming from the mold, a special extrusion with a swaged part that requires a forceful deformation to place the end cover on the lip of the drum, and simultaneously to assure that the end cover remains tightly in place to seal against the intrusion of outside agents.
Thermosetting, according to a well-known technique, of a sheet of high density, low pressure polyethylene, hereafter called PeHdBp, can constitute a method of making of this end cover. In this case, a negative metallic mold, presenting an undercut form is utilized, and the different shrinkages, primary (immediate) and secondary (with time), of the PeHdBp allow the unmolding of the end cover and assure its automatic clipping on the drum.
In accordance with a particularly advantageous embodiment of this invention, the extruded section of the swaged part includes regularly spaced rigidity ribs around the periphery of the end over for obtaining a more efficient tightness of the end over on its support. This is also due to a better elasticity of the extrusion.
BRIEF DESCRIPTION OF THE DRAWINGS
Other particularities and advantages will appear from the reading of the description and the claims which follow, with reference to the accompanying drawings on which:
FIG. 1 is a view in partial perspective, from above, of a metallic type drum, for example, intended for storing and transporting lubricants.
FIG. 2 shows the end cover being set in place by peripheral clipping.
FIG. 3 represents the end cover clipped on the drum.
REFERENCES:
patent: 2922563 (1960-01-01), Aldington
patent: 3504823 (1970-04-01), Logomasini
patent: 3946897 (1976-03-01), Wolff
patent: 4026459 (1977-05-01), Blanchard
patent: 4275815 (1981-06-01), Davis
Expandet
Hall George F.
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