Patent ID: 7457115

Claim:
An apparatus, comprising: a housing defining a chamber with a spherical surface, an inlet port opening through said housing into a hemisphere of said chamber, and an outlet port opening through said housing from the same hemisphere of said chamber; a planar, disk-like first rotatable member mounted within said housing for rotation relative thereto and positioned to bound the hemisphere within said chamber, the hemisphere communicating with said inlet port and said outlet port; a shaft extending through the chamber skewed relative to a plane of said first rotatable member; and a planar, disk-like second rotatable member mounted within said housing for movement relative to said housing and to said first rotatable member, said second rotatable member, including: a first half disk portion extending from a first side of said first rotatable member along said shaft, wherein the first half disk portion includes a first planar side; and a second half disk portion extending from a second opposing side of said first rotatable member along said shaft, wherein the second half disk portion includes a second planar side, and wherein the first and second planar sides face a same direction; said second rotatable member mounted in said housing for rotation about the shaft and coupled to said first rotatable member for oscillation about an axis lying in the plane of said first rotatable member; said rotatable members cooperating one with another and with said ports to define an expanding volume opening from said inlet port and a contracting volume opening to said outlet port; rotation of said first and second rotatable members inducing a flow of fluid through said ports and said chamber.