Auxiliary device for displacing a payload receptacle of an elevator

An elevator installation, comprising:

• an elevator shaft having a plurality of vertically aligned stations with respective pedestrian floor areas;
• a payload receptacle arranged in the elevator shaft so as to be vertically movable;
• means for braking the payload receptacle in the elevator shaft;
• means for temporarily releasing the braking means;
• auxiliary drive means for displacing the payload receptacle when the brake release means is activated, the brake release means and the auxiliary drive means being arranged in an uppermost region of the elevator shaft;
• a crank rod linkage connected to the brake release means and the auxiliary drive means for driving the auxiliary drive means, the crank rod linkage having an actuating end arranged to be movable from a rest position within one of the elevator shaft and a wall of the elevator shaft through an opening in the wall of the elevator shaft into a working position outside the elevator shaft;
• and
• a rod linkage extension coupled with the crank rod linkage, the rod linkage extension having a vertical effective length that substantially corresponds to at least a vertical spacing of the pedestrian floor areas of two adjacent station in the elevator shaft, the rod linkage extension comprising several extension elements arranged and coupled in series, one of the extension elements has a greatest vertical effective length of the extension elements and is rigid and mounted at a stationary location in the elevator shaft.