Screw conveyors, augers, and flighting for use therein
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United States of America Patent
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Jun 23, 2015
Grant Date -
Oct 16, 2014
app pub date -
Apr 8, 2014
filing date -
Apr 10, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In a continuous screw conveyor or auger, the rotatable screw member comprises a helical radial blade (“flighting”) carried on a central driving shaft. The flighting is formed by providing a raw metal strip, generally of uniform thickness, performing optional compression and flaring of the metal strip, and rolling the metal strip between a pair of opposed, preferably offset, conical rolls. In contrast to prior art rolls, the present invention provides on at least one of those rolls a stepped conical rolling surface formed so as to exert a lesser and reducing rolling pressure on an outer portion of the helical blade being formed, thereby to produce a blade in which the outer portion tapers to a thickness which is preferably 125% of the thickness of the ingoing material to provide a greater wear resistant surface, a longer working life to the flighting and improved output performance.
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