A dolly for use on a chain conveyer in moving an object over a pair of spaced rails comprising: a shaft having two ends, pusher structure mounted on said shaft intermediate said ends for pushing said object over said rails without rotational movement of said pusher structure, said pusher structure including connecting means for connecting said pusher structure to said chain conveyer; and roller removably secured to said ends of said shaft for rotation about said shaft, said rollers adapted to engage said rails.
A system for obtaining positional information about a vehicle includes a vision imaging system and a vehicle position adjustment mechanism for moving the vehicle between at least two positions for detection by the vision imaging system. The vehicle position adjustment mechanism includes a body, surface support wheels, a motor, and a controller. The body engages the vehicle, and the controller controls the direction and distance the vehicle position adjustment mechanism moves the vehicle. The surface support wheels are connected to the body and support the body on a surface. The motor drives the vehicle between the at least two positions.
