Receptacles – Closures – Removable closure retained by friction
Reexamination Certificate
1998-08-24
2001-04-03
Shoap, Allan (Department: 3727)
Receptacles
Closures
Removable closure retained by friction
C220S573100, C220S912000
Reexamination Certificate
active
06209750
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to removable covers for cooking vessels and specifically to a strengthened and improved downwardly depending edge for said covers.
In the art of designing cooking vessels, it is desirable to design a cover or lid for a cooking vessel that is both strong and light weight. Accordingly, covers for cooking vessels are generally formed of relatively thin material that has a high strength and rigidity. Examples of such materials are stainless steel and aluminum. It is also well known in the art that forming complex shapes or curves into the cover of a cooking vessel will make the cover stronger and more rigid. These complex shapes or curves may also make the cover for a cooking vessel more aesthetically pleasing.
One drawback to the use of relatively thin materials in a cover for cooking vessels is that a downwardly depending edge of the cover may become dented or otherwise deformed. These deformations occur as the result of normal use and as the result of accidents, such as dropping the cover on the floor. However, the maintenance of the shape of a downwardly depending edge of a cover is critical to the proper mating of the cover with a corresponding cooking vessel. If the edge becomes deformed the performance of the cooking vessel is reduced. One objective of the design of the present invention is to provide a strengthened edge for the cover of a cooking vessel. Another object of this invention is to provide a cover for a cooking vessel that is both strong and not susceptible to the build-up of volatile food substances. Another object of this invention is to provide an improved method for fabricating such a cover for a cooking vessel.
SUMMARY OF THE INVENTION
The present invention may generally be described as a cover for a cooking vessel having a strengthened edge for improved life of the cover and which further provides a positioning means for positively positioning the cover on the corresponding cooking vessel. The strengthened edge for the cover of the cooking vessel comprises a downwardly extending on depending skirt. An upper portion of the downwardly depending skirt has substantially the same outer diameter as that of corresponding cooking vessel. The skirt also has an inwardly offset lower portion, this lower portion having an outer diameter such that the lower portion may be received within the inner diameter of a rim of a corresponding cooking vessel. The lower portion of the skirt is folded inwardly and upwardly upon itself Furthermore, the folds of the lower portion are mechanically sealed so as to remove any spaces between the inner and outer layer of the lower portion, thereby preventing the ingress of volatile food substances into the interface between the inner and outer layers of the folds.
Between the upper portion of the cover and the inwardly offset lower portion of the skirt is a substantially horizontal offset portion that, when the lower portion of the skirt is received by the corresponding cooking vessel, supports the cover on the upper edge of a corresponding cooking vessel.
In addition, the lower portion of the skirt of the cover for a cooking vessel may be frusto-conical in shape.
The method for forming the strengthened edge on a cover for a cooking vessel comprises forming a cover blank having a central portion of appropriate diameter and shape, and a downwardly depending skirt of substantially cylindrical shape that terminates in a cut edge. Forming an inwardly rolled bead on the cut edge of the skirt. Forming an offset intermediate an upper and a lower portion of the skirt, effectively flattening the inwardly rolled bead such that the lower portion of the skirt is comprised of an inner layer mechanically sealed to an outer layer that defines the outer diameter of the lower portion of the skirt.
REFERENCES:
patent: 850143 (1907-04-01), Donnelly
patent: 1618675 (1927-02-01), Quigley
patent: 1701384 (1929-02-01), McGarvey
patent: 1799205 (1931-04-01), Wood
patent: 2688419 (1954-09-01), Henchert
patent: 2719645 (1955-10-01), Wyman
patent: 2934236 (1960-04-01), Groves
patent: 4258695 (1981-03-01), McCarton et al.
patent: 188749 (1937-04-01), None
patent: 4-28423 (1992-01-01), None
patent: 4-33725 (1992-02-01), None
Merek Joe
Regal Ware, Inc.
Ryan Kromholz & Manion S.C.
Shoap Allan
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