| 摘要 |
<p>An earth working assembly with hydraulically pivotable earth working tool is for direct attachment to a tractor or to a vehicle towed by a tractor. It comprises a combined hydraulic or operative cylinder and control valve system. They are constructed to form a single combined unit of minimum size. No connector type hydraulic pipes are provided, the hydraulic cylinder operating by means of a rotary of longitudinal motion type piston. This arrangement gives freedom of movement especially in the vertical direction.</p> |
