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US 2004/0164042 A1Published application
Jib load limiting device
AssigneeNational Crane Corporation
InventorsWilliam Dennis Schneider, Max Fischer
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Abstract
A load limiting device for a jib extension includes a pivotal insert adjacent the tip of the jib extension, a cable sheave mounted on the insert, a force measuring device for measuring forces imposed upon the insert by a load on the cable, an angle transducer for measuring the angle of orientation, and means for determining, based upon such force and angle of orientation, the load on the jib extension.
Claims12
A load limiting device for an extension attached to a lifting boom of a lifting apparatus that lift loads by means of a lifting cable;
- said load limiting device comprising:
- an insert adjacent the remote end of said extension and pivotally mounted to said extension at a first location;
- a cable sheave mounted on said insert at a second location for receiving and supporting the lifting cable of said apparatus during lifting operations;
- a force measuring device associated with said extension, said force measuring device engaging said insert at a third location for measuring the force imposed on said sheave by the lifting cable;
- an angle transducer associated with said insert for measuring the angle of orientation thereof;
- a calculating device which receives a signal from said force measuring device and a signal from said angle transducer, said calculating device comprising means for determining the load on said extension based upon said force and said angle of orientation;
- and
- control means for determining if an overload condition is occurring in said extension and for controlling operation of the lifting apparatus.
5 more elements
Dependencies are inferred from the claim text.