Patent ID: 7303062

Claim:
A bulk materials pump feeder comprising: a housing having: (a) an inlet, (b) an outlet, and (c) an inner wall extending from the inlet to the outlet; a drive rotor having: (a) a hub rotatable about a rotation axis, and (b) a plurality of drive disks having a periphery and extending away front the hub toward the inner wall of the housing; (c) low-friction seals disposed on the periphery of the drive disks; and a materials scraper: (a) mounted in the housing, (b) extending into the drive rotor between the drive disks, and (c) having a flexible tip configured to prevent material handled by the bulk materials pump feeder from either flowing backward to a discharge point proximate the outlet of the housing or jamming between the drive disks and the materials scraper; the inner wall of the housing, the drive disks, and the hub defining a materials transfer duct through which material is transferred from the inlet of the housing to the outlet of the housing.