Enclosed threshing cylinder with rasp-type bars

  • US 6,261,176 B1
  • Filed: 01/25/1999
  • Issued: 07/17/2001
  • Est. Priority Date: 11/24/1998
  • Status: Expired due to Fees
First Claim
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1. A threshing mechanism for a combine, comprising:

  • an enclosed cylinder having a longitudinal axis of rotation, and a cylindrical outer periphery and closed ends that define a closed space surrounding the longitudinal axis of rotation, the closed space being substantially impervious to crop material;

    a plurality of mounting structures secured to said cylindrical outer periphery of the enclosed cylinder at circumferentially spaced positions, said mounting structures each having a mounting face positioned radially outwardly from said outer periphery;

    a plurality of rasp-type bars secured to said mounting faces and extending along a length of said enclosed cylinder;

    said rasp-type bars each comprises a base portion and a plurality of teeth evenly spaced along a length of said base portion and extending therefrom, said teeth having leading edges that are sloped rearwardly and radially outwardly relative to a direction of rotation at an angle of less than 15 degrees from a radial line passing through said axis of rotation;

    said teeth each have a height from said base portion to a tip of said teeth that is substantially constant from leading edges of the teeth to trailing edges thereof; and

    said mounting structures each have a sloped front surface that slopes outwardly and rearwardly relative to a direction of rotation to guide crop material toward said rasp-type bars.

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