with the following novelties: rectangular pedestal (83) which consists of the boxes (1 and 2) whose outer flanks have places (16 and 17) for mounting the weight (18), and L-profiles (3 and 4) and the boxes (1 and 2) have the boxes (5 and 6) pulled into them whose ends have the castor (7 and 8) carriers welded to them bearing the castors (9 and 10) which provide adjustment of the distance between the castors (9 and 10) and ends of the boxes (1 and 2), and upper side of the pedestal (83) have welded sleeves (19, 20, 21, 22) in their corners where there are pulled in and fixed the pipes (23, 24, 25, 26) whose tips go into the sleeves (34, 35, 36, 37) of the rectangular frame (33) where they are fixed with the fixation (38, 39, 40, 41) elements going through each of their sides so that the elements (38 and 39) also fix the bars (42 and 43) whose tips include the joints (44 and 45) which are pulled into the pipes (23 and 24), so that the joint (44) is in turn followed by the bar (46), pipe (47), joint (48), pipe (50), bar (51) and the mount (52) arm, while the joint (45) is in turn followed by the pipe (53), joint (54), pipe (55), joint (57) and the pipe (60) with the carriers (68 and 69) of the keyboard with the mouse (80) pedestal.