Hoist pull-limiting device
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United States of America Patent
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Dec 27, 2016
Grant Date -
Oct 30, 2014
app pub date -
Apr 25, 2014
filing date -
Apr 30, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A hoist (19) pull (P) limiting device (11), comprising: a first bearing element (14) to which the hoist (10) is fastened; a second bearing element (18) fastened to the bearing structure (24) on which the pull strength (P) acting on the hoist (10) is unloaded; a butt hinge (16) connecting the first (14) and the second (18) bearing elements with each other, the hinge (16) axis being substantially perpendicular to the direction wherein, through rope (22) of the hoist (10), the pull (P) acts on the latter, said axis being at a certain distance from the rope (22) leaving the hoist (10) drum; elastic means (20; 20A; 20.1; 20.1A) suitable to oppose the rotation of the first bearing element (14) away from the second bearing element (18) on account of the pull (P); means (28) suitable to detect when the width of the rotation angle (f) of the first bearing element (14) relative to the second bearing element (18) matches the maximum predetermined pull (P), as well as to emit the relevant signal.
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