Mobile platform with twin retractable stabilising legs - has leg jack hydraulics connected to compensate for unequal ground height

摘要

The twin stabilising legs (6,7) are connected to a common beam (9) connected to jacks (14,15) about an axis (18,22) and to the main rear platform frame about a second axis (11,12) The jacks can rotate the legs down while maintaining the beam (9) horizontal. When one of the legs touches the ground, a resistance is set up increasing the hydraulic pressure in the same side jack. As both jack hydraulics are connected, the other jack is forced to extend until the pressure is even and both legs bear equally on the ground.