Patent ID: 7229032

Claim:
In combination: a self-propelled irrigation system including an elongated pipeline supported upon a plurality of spaced-apart drive units; at least one of said drive units including a generally transversely extending base beam having first and second ends; a first in-line drive assembly pivotally connected to said base beam adjacent said first end thereof; a second in-line drive assembly pivotally connected to said base beam adjacent said second end thereof; each of said first and second drive assemblies including: (a) an elongated support member, having first and second ends, pivotally connected, about a generally horizontal axis which is generally transverse to the longitudinal axis of said base beam, to said base beam adjacent the associated end thereof; (b) a first driven wheel rotatably mounted on said first elongated support member adjacent said first end thereof; (c) and a second driven wheel rotatably mounted on said first elongated support member adjacent said second end thereof; said driven wheels being positioned in-line laterally of said base beam and laterally of said elongated support member.