Patent ID: 6718885
Filing Date: 2004-04-13
Classification: B61C

Abstract:
A trolley for use with an enclosed track having at least one curved portion, the enclosed track being an elongated hollow member having a top wall portion, a pair of side wall portions and a pair of flanged portions, the flanged portions are spaced from each other to define a slot therebetween extending longitudinally along the track, said trolley comprising a rolling section and a drive section, said rolling section comprising first and second roller portions, said first roller portion being located within the track and comprising at least one support roller arranged to roll on at least one of the flange portions of the track, said second roller portion being located within the track and comprising a drive wheel arranged to roll on the top wall portion of the track, said second roller portion being spaced longitudinally from said first roller portion, said drive section being located outside of said track and including an articulated joint coupling said first roller portion to said second roller portion, said drive section being arranged to cause said drive wheel to rotate and roll along the top wall portion of the track, whereupon said drive wheel causes said trolley to move along the track, said articulated joint enabling said first roller portion to pivot longitudinally with respect to said second roller portion to enable said trolley to negotiate curves in the track.