Stock material or miscellaneous articles – Sheet including cover or casing
Reexamination Certificate
1999-08-17
2001-12-11
Ahmad, Nasser (Department: 1772)
Stock material or miscellaneous articles
Sheet including cover or casing
C052S003000, C052S309160, C052S785110, C052S790100, C428S068000, C428S070000, C428S071000, C428S074000, C428S075000, C428S076000, C428S102000, C428S103000, C428S188000
Reexamination Certificate
active
06329038
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority from European Patent Application No. 98610027.9 filed Aug. 17, 1998.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an insulating cover for open cooling devices, such as refrigerators or deep freezers generally used in stores and supermarkets. In numerous cases refrigerators or deep freezers will not be covered over a longer period of time, e.g. stores selling products that need cooling to maintain freshness, rely on open refrigerators and deep freezers to provide easy accesses for the customers to the produce. However, in the closing hours of these stores the energy consumption can be greatly reduced by applying insulating covers to the openings of these cooling devices.
2. Description of the Prior Art
The conventional technique, used for reducing the energy consumption of cooling devices in the closing hours of stores and supermarkets, applies insulating covers to the openings of refrigerators or deep freezers. Chest refrigerators or chest deep freezers are conventionally covered by self-supporting insulating covers, supported by the edges of the chest refrigerator or chest deep freezer. The conventional self-supporting insulating cover as described in DK patent no.:152602, to which reference hereby is made.
The conventional insulating cover comprises two plastic foils joined at the circumferentially outer rim providing an enclosure for the insertion of insulating material. Rods or beams are mounted to the cover to constitute a self-supporting effect of the insulating cover, however the rods or beam increase the weight of the insulating cover. The rods' or beams' overall weight contribution to the total weight of the insulating cover is considerable compared to of any of the parts included in the cover.
Experience from using conventional technique shows that usage of the conventional insulating cover on top of cooling devices, renders it necessary to insure the insulating material from moving within the enclosure thereby reducing the overall insulating effect of the cover. Therefor a type of fixation is needed to avoid shifting, to any substantial extent, of the insulating material.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide an easy to handle, durable self-supporting insulating cover having an overall polygonal, semi-circular, circular, semi-elliptic, elliptic or any of above combinatory shape with an improved stiffness and support of the insulating cover.
A feature of the present invention originates from the fact that stitching through the insulating cover insuring the enclosed insulating material from concentrating at any particular areas of the insulating cover can be avoided. This is particularly advantageous because by avoiding through-stitches, thermal bridges between air inside the cooling device and outside the cooling device are eliminated, and by insuring a stable insulating material without through-stitches an enhanced insulation is achieved.
A particular advantage of the present invention relates to the lighter structure of the insulating cover, which renders it easy to handle and carry the insulating cover and therefore provides a more manageable and mobile insulating cover.
The above object, feature and advantage together with numerous other objects, features and advantages, which will be evident from the below detailed description of preferred embodiments of the insulating cover according to the present invention, comprising:
(a) a gas and water impermeable first foil and defining a first circumferential outer rim,
(b) a gas and water impermeable second foil substantially coextensive with said first foil and defining a second circumferential outer rim, said first and second foil being joined together at said first and second outer circumferential rims of said first and second foils, defining an enclosure between said first and second foils,
(c) a body of insulating material inserted in said enclosure, and
(d) a plurality of supporting tubular elements in co-planar relationship with said first and second foil providing stiffness of said insulating cover in axial direction of said plurality of supporting tubular elements and flexibility of said insulating cover in a direction perpendicular to said axial direction, said plurality of supporting tubular elements having a weight constituting at a maximum 30% of the total weight of the insulating cover, such as a weight within the range of 5% to 25%, preferably 10% to 20% of the total weight.
Using a plurality of supporting tubular elements constitutes a significant reduction of the overall total weight of the insulating covers compared with the conventional covers. This fact insures an easy to handle, manageable and therefore more mobile construction, which reduces the time spend on the application and removal of the insulating covers. Furthermore the plurality of supporting tubular elements provides a greater stiffness of the cover in the axial direction compared to conventional covers using rods or beams, hence constituting a smoother surface of the insulating cover minimising any shifting or slipping of the insulating material inside the insulating cover. Finally the smoother surface reduces the material from concentrating at any particular area of the cover and therefor eliminates the need for through-stitches to fixate the insulating material.
The plurality of supporting tubular elements can have an overall length in the axial direction concordant with length of an insulating cover in that same direction, alternatively the plurality of supporting tubular elements can have an overall length in the axial direction longer than the length of the insulating cover in that same direction, or, finally, the plurality of supporting tubular elements can have an overall length in the axial direction shorter than the length of the insulating cover in that same direction thereby providing the insulating cover with a flexible extenuation allowing the insulating cover to fold about an edge of a cooling device.
The plurality of supporting tubular elements can be fixed to one of the outer surfaces of said first or second foils, or it can be fixed in said enclosure. The plurality of supporting tubular elements can be fixed to said first and/or second foils by gluing, welding, stitching or combinations thereof. Stitching can involve stitching a plurality of bands onto the outer surfaces of first or second foils with two parallel series of stitches leaving a space between them for the insertion of one supporting tubular element in each said space. This wide variety of options allows insulating covers according to the present invention to fulfill numerous of customized solutions and designs to optimized for an enhanced insulation.
The body of insulating material can comprise mineral fibers, plastic fibers, plastic filaments, partly coherent foam spheres, fully coherent foam spheres, any other insulating materials or combinations thereof An embodiment according to the present invention can comprise a body of fully coherent insulating material defining a sheet structure with a circumferentially outer rim. The application of a sheet of insulating material can insure against fibers evading the enclosure, and therefor increase the life span of the insulating cover.
The body of insulating material can be loosely inserted into the enclosure, or it can be fixed in the enclosure by gluing, welding, stitching or any combinations thereof the insulating material to said first and/or second foils. When applying a body of fully coherent insulating material it can be fixed at the circumferentially outer rim of said first and/or second foils by gluing, welding, stitching or any combinations thereof. The first and second foils can be joined at their outer circumferential rims by stitching through a band folded about outer surfaces at said outer circumferential rims of said first and second foils and the circumferentially outer rim of said body of insulating material situated in said enclosu
Ahmad Nasser
Combi-Therm A/S
Vigil Thomas R.
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