Patent ID: 6012910
Filing Date: 2000-01-11
Classification: F04B

Abstract:
An oscillating pump for moving fluid longitudinally from an inlet area to a discharge area comprising a housing, an electromagnetic coil in said housing, an impeller including a passage through which the fluid may pass from the inlet area to the discharge area, an armature positioned adjacent to said coil and carried by said impeller such that upon activation of said coil said armature moves in one longitudinal direction thereby transferring fluid through the discharge area, a first spring having one end resting against a portion of said housing and the other end resting against one side of a spring receiving surface of said impeller, and a second spring axially aligned with said first spring and having one end resting against another portion of said housing the other end resting against opposite side of said spring receiving surface of said impeller, said second spring being compressed upon activation of said coil and said first spring being compressed upon deactivation of said coil, said second spring providing a force to move said armature in a longitudinal direction opposite to said one longitudinal direction.