Hyer Industries, Inc.

Robert L Andrews

Edward A Packard

A screw feeder for particulate solids comprises a trough section including a first chamber with a trough shaped side wall downwardly converging to a longitudinally tapered aperture. A screw chamber encloses a space below and connecting with the aperture. The screw chamber houses a feed screw which enters a feeder section in a transition region at the front wall of the agitator chamber. An agitator draws material away from the transition region of the agitator chamber.

Screw feeder with progressively decreasing screw confinement

A volumetric dry material feeder comprising a movable wall hopper. Nesting lower and end wall hopper components receive and clamp a flexible diaphragm sheet in position to overlie mutually opposing hopper walls and to receive and isolate the material therefrom. A pair of thrust plates are each located between the diaphragm and a hopper wall and alternately displaced relative thereto at differing frequencies to produce a continually varying combination of thrust plate movements.

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Plymouth, MA, United States of America

Robert L Andrews