| 摘要 |
A first driverless wheeled vehicle 10 is arranged to follow a trackless guide such as a wire 14. The vehicle is self-propelled e.g. battery-powered, and adapted to carry a second driverless wheeled vehicle 35. The second vehicle is adapted to ride on tracks 24, 26 or (48, 50), Fig. 1, and has a drive wheel 38 adapted to be driven frictionally by a drive shaft 28 or (52). <IMAGE> |
