a lawn mower includes an elongated downwardly open housing having an endless belt entrained therein about a pair of pulleys mounted at opposite ends of the housing . a plurality of c - shaped , channel - like blades are mounted transversely on the outer surface of the belt to cut the lawn as the housing is moved across the lawn on a plurality of rollers . the housing is divided into a plurality of sections which are pivotally interconnected so that the housing sections may pivot relative to each other due to uneven ground . guide brackets are provided within the housing to maintain the opposed reaches of the belt parallel to each other during such pivoting of the sections .