Irrigation system joint
US-7309035-B2Abstract
A flow-through joint in an irrigation machine between the main pipeline section and a swing span, such as a corner span, permits a limited amount of generally linear displacement of the swing span within the joint for speed control or other purposes. A turret that rotates freely on the upright outlet port of the main pipeline section has a pair of coupling assemblies on opposite sides of the upright pivot axis through the outlet port, one of such coupling assemblies having a ball joint and the other being provided with relatively displaceable components. The arms of a connecting yoke on the inner end of the swing span are coupled with the ball joint on the one hand and the displaceable components on the other so as to provide the necessary swinging and pivoting motions while at the same time allowing displacing movement as necessary for control purposes. Opposing resilient cushions normally hold displacement components of the assembly in an equilibrium position but can be compressed to allow the displacing movement when the force exerted by the swing span exceeds a predetermined level. The small amount of displacing movement occurs about an upright axis through the ball joint on one side of the turret.
Patent figures（8）
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