Peristatic pump with hose positioning means and pressure adjustment apparatus

Claim 1

A liquid transfer pump in which a soft flexible hose is arranged along an internal peripheral wall of a semi-circular external enclosure, a drive shaft which is driven by drive means is provided at a position with an equal distance from said internal peripheral wall and a plurality of squeeze rollers, which travel around said drive shaft as a center while rolling around their own axis in accordance with rotation of said drive shaft and squeeze said hose while depressing the hose against said internal peripheral wall to transfer a liquid contained in said hose from one position to another position, are rotatably supported by a holder fixed on said drive shaft, wherein said internal peripheral wall of the external enclosure is slanted and external peripheral surfaces of said squeeze rollers are arranged in parallel with said internal peripheral wall, two core bars being fixed at eccentric positions of both ends of a core of said squeeze roller, a worm wheel to which one of said core bars is fixed, a hole in the holder receiving the other of said core bars and a worm engaged with said worm wheel.