Patent ID: 8047405

Claim:
A volumetric fluid dispensing device, comprising: a) a fluid reservoir having at least one flexible wall; b) a dispensing reservoir oriented at least partially above the fluid reservoir and having an overflow return fluidly connected to the fluid reservoir, said dispensing reservoir capable of holding a measured volume of fluid; c) a reservoir conduit fluidly connected to the fluid reservoir and the dispensing reservoir; d) a dispensing conduit fluidly connected to the dispensing reservoir to allow fluid to exit the dispensing reservoir; and e) a mechanical wall actuator operatively associated with the wall for controllably flexing at least a portion of the wall sufficient to force fluid from the fluid reservoir to the dispensing reservoir via the reservoir conduit, wherein the mechanical wall actuator comprises: a rotating graduated cam operatively connected to a driving motor for rotating the graduated cam, said graduated cam having a peripheral edge which increases in diameter circumferentially to a maximum point, and a valve cam axially connected to the rotating graduated cam along a common axis member, said valve cam having a peripheral portion for actuating a valve subsequent to contact of the maximum point with the flexible wall, the valve being operatively connected along the dispensing conduit for controlling exit of the measured volume of fluid from the dispensing reservoir.