A crank drive arrangement according to the present invention comprises two containers (10) arranged opposite one another and movable or deformable elements (9) which are provided in the containers (10) and by means of which the capacities of the containers (10) can be varied, while the air tightness of the same is retained. The elements (9) are connected to one another by a connector (6), and the connector (6) is secured to an eccentric shaft (2) which is provided around a rotary shaft (1) of a motor. Therefore the rotary movement of the motor is naturally converted in a uniform manner by the connector (6) into a linear reciprocating movement of the movable or deformable elements (9), and it becomes possible to shorten the distance between the containers (10). <IMAGE>
