Patent ID: 8740189

Claim:
A lifting system for vertical adjustment of a transportation system structure in the form of an escalator or moving walk, comprising: a foot mounted to the transportation system that points downwardly during assembly of the transportation system structure, the foot having a surface at an acute angle extending with respect to a horizontal; and a foot cradle unit for engagement with the foot to support the transportation system structure; the foot cradle unit having a foot cradle, a wedge element, and a base, the foot cradle having a top supporting surface at a mirror-symmetric acute angle to the foot surface arranged for complementary engagement with the foot surface and a lower surface at an acute angle to the horizontal; the base having a top surface at a wedge angle to the horizontal; the wedge element having an lower bounding surface at an angle complementary to the wedge angle and movably supported upon the base top surface and an upper bounding surface at an angle complementary to the angle of the foot cradle lower surface and movably supporting the foot cradle, the upper and lower bounding surfaces being arranged mirror-symmetrically to the horizontal; the foot cradle lower surface resting on upon the upper bounding surface, the wedge element being movable horizontally upon the base top surface such that the foot cradle lower surface moves vertically whereby the transportation system structure thereby changes its positional height and the vertical adjustment thereby takes place.