Abstract: An under-cart type guided tractor comprising a frame provided with a driving unit including driving wheels on the underside thereof, the guided tractor being adapted to travel guided by a guide signal sent out from a guide element, such as a magnetic tape laid along a traveling path on a floor surface, and to draw a cart provided with free wheels and loaded with goods, with the guided tractor located under a load-carrying platform of the cart. The frame of the guided tractor has a height that allows the guided tractor to move under the frame of the cart, and a structure that does not allow the vertical load of the cart to act on the guided tractor. The frame of the guided tractor comprises at least two separate frame components that are arranged in line with the travelling direction of the guided tractor and joined by a pin in a manner such that the frame components are allowed to take an upward or downward bent formation.

Abstract: An under-cart type guided tractor comprising a frame provided with a driving unit including driving wheels on the underside thereof, the guided tractor being adapted to travel guided by a guide signal sent out from a guide element, such as a magnetic tape laid along a traveling path on a floor surface, and to draw a cart provided with free wheels and loaded with goods, with the guided tractor located under a load-carrying platform of the cart.

Abstract: An automatically guided vehicle that runs guided by guide signals transmitted from guiding material laid on the floor. The wheels at the four corners of the chassis of the vehicle are casters that can be switched over between free and fixed modes. A steering drive unit which can move by itself in longitudinal direction is mounted on the lower surface of the chassis at approximately the center thereof. Sensors that detect guide signals are provided at the front and rear parts of the steering drive unit. The steering drive unit changes its operating position automatically as the vehicle switches over between forward and backward running modes. The casters change modes in such a manner that, as the automatically guided vehicle switches over between forward and backward running modes, the casters at the front function as free wheels while the casters at the rear function as fixed or pivot-restrained wheels.