Abstract: An air reflux assembly for a conventional or a automatic cleaner comprising an outer shell, an inner shell, a rotating disc, a rotating disc seat and plurality of return air ducts. The inner shell is positioned in the lower part of the inner chamber of the outer shell and does not contact the inner wall of the outer shell; the rotating disc seat is connected to the upper portion of the inner shell, the lower part of the rotating disc is placed in the rotating disc seat, three groups of windows are arranged in the upper, middle and lower portion of the rotating disc, another three groups of windows which correspond to the three groups of windows of the rotating disc are arranged in the upper, middle and lower portion of the rotating disc seat; air inlets and air outlets are arranged in the rotating disc seat and the two ends of the return air ducts are respectively connected to the air inlets and air outlets.

Abstract: The present invention relates to a contact-type sensor of an object, which is constructed by placing an elastic light material such as a sponge with certain thickness on the surface of the object and plastic membrane switches which are just like the keyboard of a computer are arranged below the sponge. When a robot equipped with the sensors meets a barrier, the sponge on the surface is pressed and the force can be absorbed by the sponge and transferred to the plastic membrane switches, just as the switches are pressed directly, therefore, the robot can perceive the barrier in one direction.

Abstract: An air reflux assembly for a conventional or a automatic cleaner comprising an outer shell, an inner shell, a rotating disc, a rotating disc seat and plurality of return air ducts. The inner shell is positioned in the lower part of the inner chamber of the outer shell and does not contact the inner wall of the outer shell; the rotating disc seat is connected to the upper portion of the inner shell, the lower part of the rotating disc is placed in the rotating disc seat, three groups of windows are arranged in the upper, middle and lower portion of the rotating disc, another three groups of windows which correspond to the three groups of windows of the rotating disc are arranged in the upper, middle and lower portion of the rotating disc seat; air inlets and air outlets are arranged in the rotating disc seat and the two ends of the return air ducts are respectively connected to the air inlets and air outlets.

Abstract: This invention is a “four-direction moving” structure that can move in all four directions without turning first. It contains two groups of wheels that are arranged perpendicular to one another, i.e. four rows of wheels form a quadrate. Within each group, the wheels turn in the same direction. The conventional circular wheels are replaced with circular eccentric or elliptical or noncircular (e.g. polygonal) wheels so that one group of wheels will not impede movement when the other group of wheels is turning by virtue of the longer diameter of the turning wheels.

Abstract: This invention is a “four-direction moving” structure that can move in all four directions without turning first. It contains two groups of wheels that are arranged perpendicular to one another, i.e. four rows of wheels form a quadrate. Within each group, the wheels turn in the same direction. There are two schemes to carrying out the “four-direction moving”: 1, the height of one of the two groups of wheels can be changed; and 2, the conventional circular wheels are replaced with circular eccentric or elliptical or noncircular (e.g. polygonal) wheels so that one group of wheels will not impede movement when the other group of wheels is turning by virtue of the longer diameter of the turning wheels.