Sprayer boom lock valve for sequencing unfolding steps
US5950926A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Nov 4, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01M7/0075
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a sprayer boom lock valve for automating the setup sequence for sprayer operation from the transport position. The lock valve comprises a lever, spring biased toward a valve closing pin, and a cam secured on the secondary boom of the sprayer boom. When the secondary boom is rotated to release wheel locks in the setup sequence, the cam releases the lever which acts on the valve closing pin to close the valve and prevent any further rotation of the secondary boom. The valve is opened again 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 rotation of the secondary booms. The automated lock valve of the present invention prevents accidental 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 secondary booms in the transport position to crash into each other damaging the sprayer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.