This document describes a patent from 1957 for an improved lifting jack. The lifting jack has an inner and outer tubular element, with a hooked lifting element carried by the outer tube. Typically the hook was welded to the outer tube, but this could cause fractures. The new design forms a recess in the outer tube and the hook has a clamping means that seats in the recess. This provides a stronger connection that is less likely to fracture during use.