A lifting device, which is configured to lift or drop at least one load bearing mechanism. The lifting device includes a power driving mechanism and multiple lifting mechanisms connecting to the power driving mechanism. The multiple lifting mechanisms march the load bearing mechanism at least from a first height location to a second height location in a rolling manner under a function of a driving force provided by the power driving mechanism. An embodiment of the present invention further discloses an ultrasonic inspection system using the lifting device.

Gliding means are attached to a side frame of the car sling, said gliding means comprising a gliding part supported through elasticity means on a frame part. The side frame is positioned on a guide rail in an elevator shaft so that the gliding part of the gliding means sets on the guide rail. The gliding means is provided with an installation jig comprising a first branch positioned between the gliding part and the guide rail, and a second branch positioned in an open space between the frame part and the gliding part for bypassing the elasticity means. The installation jig is removed when the installation of the car sling and the car has been completed.

A translation and/or transportation system, such as an elevator, is described comprising a movable structure for transportation, e.g. a passenger cabin or a load-carrying platform, a guide and a skid integral with the movable structure and slidingly coupled to the guide along a sliding axis. The skid is configured to stably and slidingly couple the movable structure to the guide, and comprises a centering member in contact with the guide. To attenuate the sliding friction, the skid comprises meansor a devicefor generating without contact with the guide a force counteracting an external load impressed on the centering member, the load-counteracting force being repulsive or attractive on the guide, and directed in the opposite direction to the force impressed by the external load on the centering member.

A sliding guide shoe for an elevator has a guide shoe housing and an insert inserted into the guide shoe housing for guiding an elevator car or a counterweight. In order to positionally secure the insert, the insert has profiled pins that engage in bores in the guide shoe housing. In order to form the profiling, the pins each have radially outwardly directed ribs or projections that are distributed evenly over the circumference.