| 摘要 |
Lifting/hoisting gear (2) has a lower guide-rod system (30) adjusted by an electro-hydraulic control system along with a hydraulic upper guide-rod (12), the length of which can be adjusted through triggering via a control circuit for the upper guide-rod so as to adjust a desired position for a device installed in the lifting/hoisting gear. The control circuit for the upper guide-rod makes it possible to regulate pressure and/or length by relying on pressure active on a hydraulic drive mechanism or on the length of the hydraulic upper guide-rod. An independent claim is also included for lifting/hoisting gear on mobile equipment like a tractor with a lower guide-rod system adjusted by an electro-hydraulic control system for lifting/hoisting gear and an upper guide-rod adjusted by a control circuit for the upper guide-rod. |
