Traversing hoists – Having random condition sensor combined with an indicator or... – Means determining overloading produced by load
Patent
1996-12-12
2000-06-27
Brahan, Thomas J.
Traversing hoists
Having random condition sensor combined with an indicator or...
Means determining overloading produced by load
340685, B66C 1316
Patent
active
06079576&
ABSTRACT:
The present invention relates to a control device for a hoist mechanism of a crane, preferably for a crane with a jib which can be varied in length and be luffed, with a hydraulic motor driving the hoist mechanism drum which motor forms a closed hydraulic circuit together with a hydraulic pump driven by a motor, preferably by a diesel engine, and with a locking brake for the hoist mechanism drum. In accordance with the invention in the high-pressure line of the hydraulic circuit a pressure gauge is positioned the signals of which are fed to a comparator unit, a unit for determining the moment of the hoist mechanism drum is provided the signals of which are fed to the comparator unit and the comparator unit together with a processing unit of the control unit adapts the pressure in the high-pressure line to the moment which must be applied by the hydraulic motor and which corresponds to the moment of the hoist mechanism drum by means of a corresponding increase or decrease of the pumping capacity in such a manner that a smooth holding, lifting or lowering of the load is possible when the locking brake is released.
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Bosler Peter
Morath Erwin
Brahan Thomas J.
Liebherr-Werk Ehingen GmbH
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