Running gear for a drive mechanism for a rail-guided displacement device

A lift assembly, comprising a carrying part comprising a chair and

• an assembly of a running rail and a running gear for a drive mechanism of a rail-guided displacement device, the assembly comprising:
• a guide rail, a base part, drive means and
• at least a first, third and second set of guide wheels, arranged one behind the other, viewed in direction of travel of the running gear, so that, during use, the running gear is guided along the rail in a desired position by the guide wheels,
• the base part comprising at least a bridge piece, a first and a second frame part, the frame parts each being movably connected to the bridge piece via a swivel axle,
• each frame part carrying a set of guide wheels and the frame parts being mutually coupled by coupling means which form a mechanical mirror, so that the angular movements of the first and the second parts about any axis substantially perpendicular to the direction of travel are always each other's mirror image in a first plane of symmetry extending at right angles to the driving direction of the running gear between the first and the second frame part, viewed relative to the bridge piece,
• wherein the swivel axle of each frame part is spaced from a rotary shaft plane of said each frame part, said rotary shaft plane defined by at least two rotary shafts of respectively the set of guide wheels associated with each said frame part, the bridge piece comprising the third set of guide wheels which lie approximately in the plane of symmetry and which, during use, have a supporting function, and the bridge piece comprising fastening means for a load to be carried.