US 4,445,958 AGranted

Insulative structure

OwnerJerome F. Jakshainventor

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Abstract

To insulate a window, the bottoms, the ends and a portion of the tops near the ends of a plurality of relatively-thick, relatively-stiff polyurethane strips are cemented to a flexible fabric by an elastomer. The maximum width of the polyurethane strips increases with their position along the fabric as the square root of a function of the stretching ability of the elastomeric cement and the radius from the center of the roller to the strip. That function includes the difference between the square of a first quantity and a second quantity, the first quantity being the sum of the radius of the particular rolled end and the stretching ability of the elastomer at the edge of the strip and the second quantity being the radius squared. The uppermost polyurethane strip forms a sealing engagement with the sill, the two sides of the backing and the ends of the strips ride in sealing tracks and the bottom strip rests on the sill to form a compartment with the window.

Claims12

Dependent claims

A method of insulating a window comprising the steps of:

cutting a flexible fabric into a substantially rectangular backing sheet having two parallel long sides and two parallel short sides with the two parallel long sides each having a different plurality of fingers of fabric extending therefrom;
cutting strips of solid stiff insulator having a length equal to said short sides and a width equal to the width of certain of said fingers of fabric;
applying an elastomeric cement between one side of each said plurality of solid insulative strips and said fabric;
fastening with said elastomeric cement said strips of solid insulator in parallel relationship to each other with their long sides adjacent to each other onto said flexible fabric with the ends of the insulators terminating at said extending fingers;
applying an adhesive to the fingers and folding them over the insulative strips, whereby each strip is held by elastomeric cement to the main body of the fabric and to the fingers;
the steps of cutting and fastening said strips of solid stiff insulators including the step of cutting insulators of different widths and fastening them in a relationship in which the smaller widths are at one end and the larger widths at the other of the flexible backing;
attaching the end of said flexible backing having the smaller width insulators to a curtain roller, whereby the fabric with insulators attached may be roller upon the curtain roller;
mounting said roller to a window;
pulling said backing strips down to form an insulator adjacent to the window;
and
raising said backing and strips to permit light to pass through said window.

8 more elements

Dependencies are inferred from the claim text.