Patent ID: 9156663
Filing Date: 2015-10-13
Classification: B66C

Abstract:
1. A crane having a counterweight monitoring system, the crane comprising: a. a turntable steelwork construction, b. a plurality of separate counterweight parts individually connectable to said turntable steelwork construction, c. a counterweight cylinder, d. at least one elastically deformable sensor connected to at least one of said turntable steelwork construction and said counterweight cylinder, and e. an electronic crane safety device (RCL), f. wherein data measured by said elastically deformable sensor representing an actual deformation of said elastically deformable sensor are sent to the RCL, and g. the RCL comprises a logic for calculating from the data sent by said elastically deformable sensor an overall calculated weight of the plurality of separate counterweight parts added to the turntable steelwork construction at a time at which said elastically deformable sensor measured the data, h. the RCL is configured to compare said overall calculated weight with the data of a bearing load table stored in a memory of the RCL, the bearing load table representing the weight of the crane with a respective number of the plurality of separate counterweight parts and defining at least one threshold value which restricts crane operations, and i. the RCL is configured to generate an output signal representative of said at least one threshold value and to transfer said output signal to an output device to give an operator said at least one threshold value.