AUTOMATIC STEERING MEANS FOR A DRIVERLESS CARRIAGE

A driverless carriage with automatic steering means rendering the carriage capable of travelling in a straight line as well as performing a rotation about a vertical axis. To improve the precision of the turning movement, the carriage is provided with means for monitoring during said movement the position, with reference to the surface on which the carriage moves, of the axis of rotation of the carriage. Said means, which include at least one measuring wheel engaging said surface, are arranged on detection of a deviation of said vertical axis from a stationary position to produce a correction signal used for adjusting the steering means of the carriage so as to eliminate the deviation of said vertical axis from the proper position.