Patent ID: 8157247

Claim:
Support jack for supporting semitrailers, said support jack having a longitudinal axis and comprising a vertically telescopically displaceable supporting device having an outer sleeve and an inner sleeve, a spindle and a spindle nut, which interacts with the spindle and is fixed to the inner sleeve, the spindle nut having first means and second means for being positively detachably connected to the sleeves, the first means interacting with a means of the inner sleeve for fixing the spindle nut in the direction of the longitudinal axis, and the second means interacting with means of the outer sleeve for fixing the spindle nut in the direction of rotation about the longitudinal axis; wherein the means of the inner sleeve comprise at least two inwardly extending projections, which engage in corresponding openings or depressions of the spindle nut that form the first means of the spindle nut.