Abstract: A stairlift includes a rail and a carriage. The carriage includes a frame, a central drive unit mounted to the frame, the central drive unit including a drive motor and a drive gear, a yoke assembly pivotably mounted to the frame, and a first bogie unit attached to the yoke assembly and a second bogie unit attached to the yoke assembly, wherein each bogie unit includes a bogie socket mounted to the yoke assembly, and a bogie ball spherically pivotable within the bogie socket, the bogie ball including a plurality of bogie ball rollers configured to hold the bogie ball to the rail, and further wherein the plurality of bogie ball rollers are configured to maintain the bogie ball in a generally perpendicular travel orientation relative to the rail.

Abstract: A stairlift includes a rail and a carriage. The carriage includes a frame, a central drive unit mounted to the frame, the central drive unit including a drive motor and a drive gear, a yoke assembly pivotably mounted to the frame, and a first bogie unit attached to the yoke assembly and a second bogie unit attached to the yoke assembly, wherein each bogie unit includes a bogie socket mounted to the yoke assembly, and a bogie ball spherically pivotable within the bogie socket, the bogie ball including a plurality of bogie ball rollers configured to hold the bogie ball to the rail, and further wherein the plurality of bogie ball rollers are configured to maintain the bogie ball in a generally perpendicular travel orientation relative to the rail.

Abstract: A running gear (3), for a drive mechanism of a rail-guided displacement device, such as a passenger lift, comprising a base part, a drive and at least two sets of guide wheels (9), arranged behind each 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 (5), a first and a second frame part (6, 7), the frame parts each being connected to the bridge piece so as to be movable about at least one pivotal axis, 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 movements of the first and the second part 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, and viewed relative to the bridge piece.