| 摘要 |
Bridge crane, particularly container loading bridge, having a portal, a boom , a track system laid on the boom and crane trolleys which travel on the tracks, in which the track system comprises a working track (10), whose two rails have a mutual spacing corresponding to the wide spacing of the running wheels (12) of the crane trolleys (14) in a working position and a return track (16), whose two rails have a mutual spacing corresponding to the narro w spacing of the running wheels (18) of the crane trolleys (14) in a return position, as well as two arched pieces (18, 20) arranged about the area of the ends of the boom where the working track (10) and return track (16) meet , and the two wheel suspension mechanisms of the crane trolleys (14) are constructed so as to rotate freely about a vertical axis (22) and the two rotation axes (22) of the crane trolleys (14) are arranged with a spacing with respect to the longitudinal axis thereof corresponding to half the mutual spacing of the two rails of the return track (16).
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