Actuation device for two lockable guide roller units on a mobile transport trolley

The device has operation sliders (2) guided in an assembly board (1) of swivel roller components and supported on a guide shaft (7) that is articulated with connection levers (3). The connection levers are rotatable on a rotational axle (13) that is fixed at the assembly board. The connection levers are coupled with each other by a tie bar (4). A coupling plane (EK) of the tie bar and the connection levers is arranged between a position plane (E7) of the guide shaft and a position plane (E13) of the rotational axle. An oblong recess (6) is formed at the tie bar.