Balancing device for a raisable-curtain goods-handling door
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United States of America Patent
Stats
-
May 3, 1994
Grant Date -
N/A
app pub date -
Mar 26, 1993
filing date -
Mar 27, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A balancing apparatus for a raisable-curtain goods-handling door includes a shaft on which a curtain is wound up or on which curtain-raising straps are wound up. The shaft supports two drums onto which are wound belts from which two counterweights are suspended. The 'long' belt from which a 'long' counterweight of 'long' mass M.sub.6 is suspended has a length that corresponds to the full stroke of the curtain while the 'short' belt of the 'short' other counterweight of 'short' mass M.sub.5 is shorter and is fastened on the corresponding drum in such a manner as to enable it to wind in either direction on the drum.
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Cited Art Landscape
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