Patent ID: 6095439
Filing Date: 2000-08-01
Classification: A01G,G01S

Abstract:
A self-propelled irrigation machine having an elongated main boom pivoted at one end to a center pivot apparatus and mounted on a plurality of self-propelled, non-steerable drive towers, an extension boom pivotally secured to the other end of the main boom for irrigating corner areas of the field, a steerable drive tower supporting said extension boom including a pair of steerable drive wheels, the improvement comprising:means for steering said steerable drive wheels for guiding said steerable drive tower along a preselected path thereby causing the pivotal extension of said extension boom into the corner areas of the field as said main boom approaches the same and pivotal retraction of said extension boom out of the corner areas of the field as said main boom departs the same;control means for controlling the operation of said means for steering said steerable drive wheels;said control means including a GPS receiver means and a computer means for receiving and processing GPS information as to the location of said main boom and for determining the optimal steer angle for said steerable drive wheels for the current position of said main boom and for positioning said steerable drive wheels in the optimal steer angle.