Device for facilitating the folding of a raisable curtain
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United States of America Patent
Stats
-
Dec 17, 1991
Grant Date -
N/A
app pub date -
Aug 10, 1990
filing date -
Aug 11, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A goods-handling door comprises a raisable curtain 1 which folds concertina-like and which is stiffened by reinforcing bars 2 having rings 4 through which lifting straps 3 are passed, which straps are wound onto a top shaft 5. During lifting and while the curtain is folding, it is desirable for the curtain to fold regularly and in a preferred direction. Flexible and inextensible elements 11 are placed between adjacent bars in order to limit the spacing between the bars, and they are given a structure which facilitates folding in the desired direction.
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Cited Art Landscape
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