BREAKING DEVICE FOR A CHAIN OF A SCREEN SUCH AS A WINDOW COVERING
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United States of America Patent
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Issued Date -
Apr 4, 2013
app pub date -
Sep 28, 2012
filing date -
Sep 30, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a breaking device for a chain (5) of a screen, comprising a housing formed by first and a second housing parts (10, 20), that are attachable to each other by a detachable coupling. In operational position, first and a second toothed wheel (11, 21) are in engagement with each other and the chain engages onto a sprocket (12) connected to the first toothed wheel (11). The detachable coupling is arranged to release when a pulling force on the chain reaches or exceeds a predetermined threshold value. The first toothed wheel (11) and the second toothed wheel (21) are mutually positioned such that the chain (5) has an engagement side (5A) and a non-engagement side (5B), such that the pulling force (Fup) on the engagement side (5A) can be larger than the pulling force (Fdown) on the non-engagement side (5B).
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