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US 4,281,743 AGranted
Insulating enclosure for disappearing stairway
OwnerGeorge C. Fullerinventor
Life of this patent
Estimating the term…
Abstract
A relatively lightweight insulating enclosure for placement over an attic structure such as a disappearing stairway or an attic fan, to reduce unwanted heat transfer through the structure when closed. The insulating enclosure comprises a number of box segments made of a lightweight insulating material such as foamed polystyrene, connected together with overlapping joints. Expansion members are optionally included to enlarge the width of the assembled enclosure.
Claims10
A knockdown enclosure for insulating a pull-down stairway of the type set in a ceiling, comprising:
- a generally rectangular box having a closed top, an open bottom, and closed sides and ends and dimensions of length and width sufficient to fit over and enclose an air space over the pull-down stairway from above the ceiling;
- said box comprising a number of box segments that fit together with overlapping joints so as to reduce heat transfer through the joints;
- and
- said box segments being made of material that is a good thermal insulator so as to minimize heat transfer through the box between the air space and the surrounding space above the ceiling.
1 more element
Dependencies are inferred from the claim text.