Track-bound rotary crane

Details Track-bound rotary crane Track-bound rotary crane

B - Operations, Transporting

66

C

B66C 23/50 (2006.01) B61D 15/02 (2006.01) B66C 23/90 (2006.01) E06C 5/36 (2006.01)

Patent

CA 2143493

ABSTRACT OF THE DISCLOSURE A rotary crane comprises a hydraulic cylinder drive for vertically adjusting an extensible crane boom, the hydraulic cylinder drive including a signal transmitter indicating the hydraulic pressure in the cylinder drive, a drive for changing the length of the extensible boom, a further drive for rotating the rotary crane on a machine frame about a substantially vertical axis whereby the crane boom may assume different angles of rotation with respect to a longitudinal direction of the machine frame, and a control for generating a reference value signal corresponding to a maximum permissible load for the crane in a given operating position, the control being associated with the hydraulic cylinder drive for vertically adjusting the extensible crane boom, the drive for changing the extensible boom length and the further drive for rotating the rotary crane, the control being connected to the signal transmitter indicating the hydraulic pressure in the cylinder drive and to at least one measuring device selected from the group consisting of a signal transmitter indicating the superelevation of the track, a signal transmitter indicating the angle of rotation of the rotary crane, a signal transmitter indicating changes in the extensible boom length, and a signal transmitter indicating the position of retractible support jacks for the machine frame. The control comprises a differential unit for comparing the reference value signal with an output signal of the signal transmitter indicating the hydraulic pressure in the cylinder drive, and a circuit breaker device is connected to the control for shutting down the drives when the differential unit indicates an overload. - 20 -

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