Patent ID: 9085442
Filing Date: 2015-07-21
Classification: B66C,F16C

Abstract:
1. An article of manufacture, comprising: a rotary joint for rotatable connection of an uppercarriage with an undercarriage of a crane, the rotary joint including first and second couplings, each coupling comprising circular opposed webs in which a plurality of retractable bolts are pluggably received and uniformly distributed around a periphery of the rotary joint in order to provide a multitude of bolt connections with a mounting flange; and a plurality of hydraulic drive units mounted on the rotary joint which generate driving torques for driving the rotary joint; wherein the mounted hydraulic drive units are directly connected with each other via hydraulic lines; wherein the mounted hydraulic drive units are directly connectable with hydraulic lines of the uppercarriage, as an entire unit, by a single hydraulic connection; wherein the rotary joint is connectable with the uppercarriage via the first coupling and the undercarriage via the second coupling; wherein, in a transport condition, the rotary joint is configured to be released as an entire unit from the uppercarriage and undercarriage and loaded for separate transport with the mounted hydraulic drive units as an entire unit.