SPRAYER BOOM LOCK VALVE FOR SEQUENCING UNFOLDING STEPS

摘要

The present invention relates to a sprayer boom lock valve for automating the se tup sequence for sprayer operation from the transport position. The lock valve compr ises a lever, spring biased toward a valve closing pin, and a cam secured on the secondary boo m of the sprayer boom. When the secondary boom is rotated to release wheel locks in the s etup sequence, the cam releases the lever which acts on the valve closing pin to clos e the valve and prevent any further rotation of the secondary boom. The valve is opened agai n by a linkage which is pulled tight when the sprayer wings are opened, retracting the lever and opening the valve. The hydraulic drive line is then reestablished to complete ro tation of the secondary booms. The automated lock valve of the present invention prevents acci dental under-rotation of the secondary booms which would be insufficient to release the wheel locks, and also prevents accidental over-rotation which would cause the secondar y booms in the transport position to crash into each other damaging the sprayer.