Manitowoc Crane Group France Sas

Thomas Heidrich

Johannes Schuermann

Johannes Schürmann

Hasko Karge

Johannes Schuerman

A crane telescope locking device includes a control device which is hydraulically in contact with a telescoping cylinder of a crane telescope and, for the purpose of actuating, with at least one cylinder lock hydraulic cylinder and includes a valve which is open in its inactivated resting state and thus opens a fluidic connection between the telescoping cylinder and the at least one cylinder lock hydraulic cylinder. A telescoping cylinder () of a crane includes such a crane telescope locking device.

Crane telescope locking device

The invention relates to a method of determining changes in loads on lifting gear, whereby a change in load is determined within load curve data at a transition point of the load curve gradient, and whereby the load curve is broken down into discrete-time observation intervals at the transition points. It further relates to a method of reconstructing load situations on lifting gear, for which such a method of determining changes in load is used.

Determining and reconstructing changes in load on lifting gear

The invention relates to an electro-hydraulic leak compensating device for a mobile crane lowering brake system in an open hydraulic circuit with a hydraulic motor () coupled with a lifting unit (), a lowering brake valve () and a mechanical brake (), with a pressure sensor () which measures the hydraulic pressure prevailing on the load side of the hydraulic motor () in the hydraulic circuit and on the side of the lifting conduit () before the mechanical brake () is closed, in particular immediately before it is closed, as well as a method of electro-hydraulically compensating for leaks of a mobile crane lowering brake system in an open hydraulic circuit with a hydraulic motor () coupled with a lifting unit (), a lowering brake valve () and a mechanical brake (), comprising the following method steps:

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Wilhelmshaven, Germany

Thomas Heidrich