Patent ID: 8136840

Claim:
A height-adjustable support for semi-trailers, comprising: a support outer tube which can be fastened to a chassis of a semi-trailer; a slidable support inner tube arranged in the support outer tube and including a foot fastened to a lower end of the inner tube, wherein the inner tube is connected with a nut to a spindle; and a transmission adapted to drive the spindle and including at least a bevel gear stage and a shiftable transmission area located upstream having gearwheels with spur toothing, and pinions, wherein the gearwheels and pinions include a fast-gear gearwheel with a fast-gear pinion, a low-gear pinion with a low-gear intermediate gearwheel and a low-gear intermediate pinion with a low-gear gearwheel, arranged in pairs in at least three different vertical planes distributed in at least a select one of within and in front of the support outer tube.