Peristaltic pump with means compressing its tube in two directions

A hose pump for conveying a fluid medium through a hose comprising a plurality of movable pressure elements consisting of a first set of pressure members and a second set of pressure members, a common drive means for activating said first and second sets of pressure members in order to progressively change the cross-sectional are of the hose along its length successively in two directions situated transversely with respect to one another, and means defining a counter pressure surface and said first pressure members are movable to-and-fro with respect to the counter pressure surface, wherein:

• each first pressure member is a plate of substantially rectangular shape, two pins are provided at a side of each said plate which bear against an adjacent second pressure member, each said second pressure member comprising a bifurcated part having a yoke and two legs, the free end portions of which define two elements movable to-and-fro with respect to the hose, each of the legs having an intermediate portion directed towards one another and said pins being against inner surfaces of said intermediate portions in order to continuously alter the spacing between free end of said legs.