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Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Michael R. Schmidt0
Date of Patent
May 13, 2008
0Patent Application Number
109017210
Date Filed
July 29, 2004
0Patent Primary Examiner
Patent abstract
A two-stage hydraulic pump includes a rotor, a ring, and a plurality of rollers disposed in slots formed on the rotor. The pump has two inlet ports and two outlet ports, which are disposed inwardly and outwardly, respectively, of the rollers. A valve mechanism is incorporated which provides for flow directional control of the output flow of the pump between one portion of the discharge ports and a portion of the inlet ports when a low output flow is desired and blocking that interconnection while connecting the inner portion of the suction inlet side with a reservoir.
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