Patent ID: 8622425

Claim:
A height-adjustable support for semi-trailers, comprising: a shaft tube body mountable on a chassis of a semi-trailer, a slidable support inner tube arranged in the shaft tube body and having a foot mounted to an end region thereof by a nut located on a spindle which is drivable by a transmission, wherein the transmission has a switchable spur gear region and bevel gear assemblies, wherein the switchable spur gear region of the transmission is formed from a low-gear pinion and a fast-gear gearwheel each adapted to engage a crank drive, and a low-gear gearwheel and a fast-gear pinion each adapted to selectively activate the low-gear pinion and the fast-gear gearwheel, respectively, wherein power is transmitted from the crank drive via the low-gear pinion to the low-gear gearwheel and alternatively from the crank drive via the fast-gear gearwheel to the fast-gear pinion; and wherein on an output shaft, a tab drive unit is supported in a rotatable manner with respect to the output shaft, wherein the tab drive unit comprises the fast-gear pinion and a fast-gear bevel pinion that are connected to one another in an unrotatable manner by a connecting member, and wherein the low-gear gearwheel is seated on the output shaft in a rotatable manner.