Irrigation system and improvement structure therein

Claim 1

An agricultural irrigation system including, in combination, an elongate irrigation line provided with spaced, supporting, keyed wheels, first means for translating said irrigation line in a direction transverse to said line, second means coupled to said line for applying mechanical torque to said line, and third means responsive to irrigation line deflection for automatically progressively adjusting at least one of said first and second means throughout operation-range thereof to vary the ratio of the speed of revolvement of said irrigation line proximate said first means to the speed of translation of said irrigation line proximate said second means, whereby to tend to correct said deflection, wherein said first and second means each comprises hydraulic jacks; said third means including: first valve means, having a control, for proportioning liquid-flow to said hydraulic jacks; a fluid inlet coupled to said first valve means; said irrigation-line sensing means attached to said control for operationally moving said control, whereby to vary progressively such liquid-flow proportioning, and wherein said third means includes a pair of branch fluid lines coupled in parallel to said fluid inlet, second and third valve means respectively coupled between said fluid inlet and said hydraulic jacks, and hydraulic circuit means hydraulically coupled to said fluid inlet and said second and third valve means and including said first valve means for variably proportioning fluid flow through said second and third valve means.