US 4,376,044 AGranted

Automatic sizing device

AssigneeButler Manufacturing Company

InventorDoyle Ditzenberger

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Abstract

An automatic sizing device for particulate or granular material containing small, medium and large sized particles flowing therethrough. The device includes an inclined housing with a first conduit having an inlet opening for receipt of the particulate material, and a second conduit that is located beneath the first conduit and has an outlet for the exit of medium sized particles from the housing. A first mesh sizing screen is longitudinally extended between the inlet and the outlet openings to divide the housing into the first and second conduits and includes a plurality of openings sized to permit passage of only medium and small sized particles therethrough. At least one metering rotor is located in the first conduit adjacent the sizing screen to retard the flow of particulate material through the first conduit and urge the medium and small sized particles to pass through the sizing screen into the second conduit. The housing may also include a third conduit defined by a second mesh sizing screen located beneath the first sizing screen and having openings sized to permit passage of only small sized particles therethrough for removal of small particles from the medium sized particles in the second conduit.

Claims5

Dependent claims

An automatic sizing device for particulate or granular material flowing therethrough containing at least large and medium sized particles, said sizing device comprising:

(a) an inclined housing having first and second conduit means, an inlet opening for receiving said material in one end of said first conduit means, and at least one lower outlet opening for exit of said medium sized particles from an opposite end of said second conduit means;
(b) a first inclined stationary sizing means to divide said housing into said first and second conduit means and having a plurality of openings between said first and second conduit means sized to permit passage of said medium sized particles therethrough;
(c) a first retarding means in said first conduit means and associated with said first sizing means to retard the flow of said material through said first conduit means thereby urging said material against the upper surface of said first sizing means whereby said medium sized particles pass through said sizing means into said second conduit means and exit from said outlet opening;
(d) said first sizing means is formed with a first transversely extended trough adjacent to said retarding means;
and
(e) said first retarding means is transversely extended across said sizing means and is in the form of a rotatably driven rotor having at least one vane for sweeping said material that has not passed through said sizing means out of said first trough to continue its flow in said first conduit means.

3 more elements

Dependencies are inferred from the claim text.