Dynamically balanced screw with concealed loading weights
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United States of America Patent
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Mar 21, 1995
Grant Date -
N/A
app pub date -
May 14, 1993
filing date -
May 14, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
An endless spiralling screw for a snowblower comprising a rotatable elongated shaft, to be power driven; a first, elongated, rigid sheet, integrally mounted to the shaft at a radially inward edge of the sheet and spiralling along the lengthwise axis of the shaft, the main portion of the sheet having a substantially straight section, the external marginal portion of the sheet being folded relative to the main portion thereof, the plane of the main portion being located downstream relative to the direction of rotation of the endless screw; reinforcing struts being anchored to the spiral sheet and having a smaller external diameter than the spiral sheet, and being fixedly connected thereto short of but proximate to the radially outward edge of the spiral sheet and fixedly secured to the shaft at its radially inward edge at an area spaced from the securing area of the radially inward edge of the spiral sheet to the shaft; and counterweights, located inside the hollow of the spiral and integral to a portion of the reinforcing struts, wherein the counterweights are positioned at selected locations whereby dynamic axial balancing of the rotating spiralling screw is achieved.
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