Plastic drum with drain sump

Details Plastic drum with drain sump Plastic drum with drain sump

1999-11-12

2001-05-01

Pollard, Steven (Department: 3727)

Receptacles

End wall structure

Having an outlet or inlet opening

C220S004040, C220S004050

Reexamination Certificate

active

06223930

ABSTRACT:

BACKGROUND OF THE INVENTION
A. Field of Invention
This invention relates to a unitary plastic drum for shipping and storing various materials, and more specifically to a plastic drum for liquid materials, which drum has a sloping bottom with a sump so that all the liquid can be pumped out efficiently.
B. Description of the Prior Art
Plastic drums are used frequently to ship and store various materials. These types of drums are preferred over metal drums because they are simpler and cheaper to make, easier to handle, and weigh less. Frequently, plastic drums are used to ship liquid materials used in agriculture, or the chemical industry which are highly concentrated and therefore, must be diluted. Since these liquids are very expensive, it is important that all the contents of the drum be removed before the drum is discarded or returned, to eliminate waste. One method of emptying completely the contents of a plastic drum would be to turn the drum upside down. However, this procedure is time-consuming and requires special equipment. Moreover, if the drum contains hazardous materials, turning the drum over may result in a spill, which is both uneconomical and undesirable.
Hence, there is a great need in the art for a plastic drum which could be emptied efficiently.
OBJECTIVES AND SUMMARY OF THE INVENTION
In view of the above-mentioned disadvantages of the prior art, it is an objective of the present invention to provide a plastic drum which can be efficiently emptied without turning it over.
Yet a further objective is to provide a plastic drum which can be made efficiently and economically for example by blow molding.
Another objective of the invention is to provide a drum which can be emptied efficiently using standard equipment.
Other objectives and advantages of the invention shall become apparent form the following description of the invention. Briefly, a plastic drum constructed in accordance with this invention consists of a substantially cylindrical plastic body having a straight side, a top and a sloping bottom. At least one access hole is provided on the top for filling and emptying the drum, said hole being off-center. The bottom is formed with a sump which is vertically aligned with the access hole whereby as the drum is emptied, all the liquid collects in the sump and is easily removed. A top and a bottom chime are added to the body for protection as well as to insure that the drum stands upright or vertical when resting on a horizontal surface, and to ease handling.


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