Inverted trolley

Inverted trolley A trolley for traveling along a beam supported from below and having two protruding flanges comprising a frame that partially surrounds the beam, a travel wheel mounted so that it contacts and rolls on an upper surface of the lower flange of the beam, a second wheel mounted within the frame for gliding the trolley along one of the upper surface of the lower flange or a lower surface of the upper flange and a guide roller mounted within the frame for guiding the trolley along the beam.