Subject of invention is rotary mechanism, equipped with horizontal, driveable frame with wheels, on which construction is placed, having form of four-bars linkage, characterized in that the horizontal driveable frame (1) consists of frame (2) rotationally fastened on one edge, rotationally fixed to support beam (3) of platform (4), where beneficially at distance (X) rotary bolt (5) is placed, connected to arm of spring (6), beneficially gas spring, rotationally fixed at the bottom of cross-bar (7), which is located in central part of frame (1), at the same moment on support beam (3) of platform (4), beneficially at distance (Y), rotary extension arm (8) is fixed, beneficially U-shaped, ends of which are rotary fixed to ends of frame (1).
