Hoist pull-limiting device

摘要

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.

主权项

1. A pull limiting device for a hoist having a rope associated with the hoist and used in connection with a crane arm, comprising:
a first bearing for attachment to the hoist; a second bearing for receiving a pull strength acting on the hoist; a butt hinge connecting the first and the second bearings to each other, a butt hinge axis being substantially perpendicular to a hoisting direction wherein, when a pull acts on the hoist through the rope of the hoist, said axis is at a certain distance from the rope leaving a hoist drum; one or more springs for opposing rotation of the first bearing away from the second bearing due to the pull acting on the hoist drum, said spring is capable of being arranged in at least two alternative mounting positions having a different distance from the hinge axis of the butt hinge or, when plural springs are present, the springs can be mounted simultaneously having a different distance from the hinge axis of the butt hinge; and a detector for detecting when a rotation angle of the first bearing relative to the second bearing matches a maximum predetermined pull being exerted on the hoist, as well as to emit a signal indicative thereof.