Screw feeder with progressively decreasing screw confinement
First Claim
1. A screw feeder for particulate solids having, in combination,a trough section comprising a first chamber having front and back walls and an elongate trough shaped side wall open at the top, closed at its ends by the front and back walls and converging downwardly to a lengthwise tapered aperture, the width of said aperture progressively increasing from the back wall toward the front wall,a screw chamber having a member enclosing a space below said aperture, said member having a lower portion substantially conforming to a half cylinder and an upper portion opening progressively from the back wall toward the front wall and terminating at said tapered aperture,a feeder section comprising full cylinder having an end attached to and communicating through the front wall coaxially with said half cylinder,a feed screw having helical flights and extending coaxially through the screw chamber and feeder sections,said member confining the circumference of the screw flights adjacent the back wall over a portion of the circumference substantially exceeding 180 degrees, such confined portion decreasing progressively in the longitudinal direction of the screw,and means to rotate the feed screw.
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Accused Products
Abstract
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.
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Citations
12 Claims
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1. A screw feeder for particulate solids having, in combination,
a trough section comprising a first chamber having front and back walls and an elongate trough shaped side wall open at the top, closed at its ends by the front and back walls and converging downwardly to a lengthwise tapered aperture, the width of said aperture progressively increasing from the back wall toward the front wall, a screw chamber having a member enclosing a space below said aperture, said member having a lower portion substantially conforming to a half cylinder and an upper portion opening progressively from the back wall toward the front wall and terminating at said tapered aperture, a feeder section comprising full cylinder having an end attached to and communicating through the front wall coaxially with said half cylinder, a feed screw having helical flights and extending coaxially through the screw chamber and feeder sections, said member confining the circumference of the screw flights adjacent the back wall over a portion of the circumference substantially exceeding 180 degrees, such confined portion decreasing progressively in the longitudinal direction of the screw, and means to rotate the feed screw.
Specification