Patent attributes
A lawn mower robot includes an inner body provided with casters and wheels for moving, a plurality of blades rotatably provided on a bottom surface of the inner body to cut grass, a drive motor mounted on the wheels, respectively, to independently drive the wheels, and an outer cover mounted on and configured to surround an outer side of the inner body to be movable in forward, backward, leftward and rightward directions with respect to the inner body when colliding with an obstacle. A plurality of ultrasonic sensors are provided to sense an obstacle, and an ultrasonic guide unit is formed to be recessed rearward from a front end portion of the outer cover so as to restrict a downward propagation angle of ultrasonic waves generated from the ultrasonic sensors.
