Improvements in bridge cranes suitable for moving along a fixed track or track characterized by the provision, on opposite sides of the crane frame, of adjustable guide rollers able to cooperate with lateral faces of the tracks or rails, being supported rotatably each of said guide rollers on a pin for rotation about an axis misaligned with respect to the longitudinal axis of said pin, the latter being supported so that it is capable of rotary or angular adjustment of its longitudinal axis and the arrangement being such that by imparting appropriate rotary or angular movements to the respective pins, the position of the guide rollers can be adjusted to accommodate the tracks or rails of different gauges. (Machine-translation by Google Translate, not legally binding)
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