Patent ID: 8197236

Claim:
A pump rotor for a roller pump, the rotor comprising: a first roller support comprising a first roller; a second roller support comprising a second roller; a center element located between the first and second roller supports and pivotally connected to the first and second roller supports, wherein the first and second roller supports are angularly movable with respect to the center element so that a distance between the first and second rollers can be varied; first and second positioning elements that connect the first and second roller supports, respectively, to the center element at points spaced from the pivotal connections thereof so as to limit the extent of angular displacement of the first and second roller supports from the center element; and first and second spring biased components surrounding the first and second positioning elements, respectively, to bias the first and second roller supports away from the center element and to allow for inward movement and automatic adjustment of the rotor, wherein the first and second positioning elements are connected to the center element by way of a movable element that is adjustably supported to the center element and so that adjustment of the movable element changes the limit of angular displacement of both the first and second roller supports from the center element, and wherein the rotor further comprises an adjustment element for moving the movable element with respect to the center element; and a lever as the movable element that is housed in the center element, wherein the lever is operatively connected to the adjustment element and the first and second positioning elements, and manual adjustment of the adjustment element causes movement of the lever, which in turn causes movement of the first and second positioning elements and in turn the first and second roller supports.