Mutually self-governing rollers in hose pump - comprise pair of rollers and single roller in conjunction with cut=out on pair rotatable parallel plate, easing entry of replacement hose

摘要

The wall (4) of the pump housing forms a segment of a circle containing a channel (5) for one or more hoses (1). Rollers (3) are at the ends of pairs of arms (12, 13). These are pivoted (10, 11) between a pair of parallel plates that rotate about the axis (9). The connecting rod (15) governs the relative position radially of the two rollers. This is adjustable (17, 18, 19, 20) and spring loaded (22). A pair of rollers (23) and single roller (24), in conjunction with a cut-out on one of the rotatable parallel plates, facilitate the entry of a replacement hose into the pump.