主权项 |
1. A disc for use in a disc screen having at least one shaft onto which the disc is mounted, the shaft defining a longitudinal axis, the disc comprising:
a body with a central opening into which the shaft is disposed, the body extending a length along the longitudinal axis; the body comprising a first major axis and a first minor axis, as defined by a first cross section taken perpendicular to the longitudinal axis at a first position along the length, the first major axis defining a first outer peripheral ridge with a diameter as defined by the distance from the first outer peripheral ridge to the center of the shaft, and the first major axis is substantially horizontal; the body comprising a second major axis and a second minor axis, as defined by a second cross section taken perpendicular to the longitudinal axis at a second position along the length, the second major axis defining a second outer peripheral ridge, wherein the second major axis is not substantially horizontal; a helical ridge in the direction of the longitudinal axis formed by a substantially continuous and non-stepwise surface between the first and second outer peripheral ridges, wherein the helical ridge substantially maintains the diameter between the first and second outer peripheral ridges. |