Rotary feeder

An impeller for metering material from an input to an output is mounted on a central shaft. The impeller is formed by a hub, a disc formed with the central hub and extending normal to the rotational axis of the hub. A plurality of spaced first vanes is formed with the disc and extends from the periphery of the disc to the hub. A second plurality of spaced vanes is attached intermediate the first vanes to the disc and extends from the periphery of the disc to a location intermediate the periphery and the hub. The back of the disc has a plurality of slots which will mate with both the first and second vanes of a preceding impeller. An adapter disc is also provided which has a plurality of radial slots on both surfaces of the disc which mate with the vanes of the previously described impeller. When the adapter disc is placed on the shaft and mated with the vanes of the preceding impeller, a last or reversed impeller can be put on by reversing the impeller so that the vanes extend toward the adapter disc thus locking in the entire impeller with slots in each succeeding and preceding impeller. In addition to the above, a pair of keyways is provided in each hub. One keyway aligns with the long vane and a second keyway aligns with the short vanes. In this regard then, the long and the short vanes can be staggered axially down the impeller shaft.