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Rock grader with tilting sorter screen

  • US 4,299,695 A
  • Filed: 08/15/1980
  • Issued: 11/10/1981
  • Est. Priority Date: 08/15/1980
  • Status: Expired due to Term
First Claim
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1. A grading plant including a self-cleaning screen for receiving lump materials and retaining oversize fractions thereof above a predetermined size, movement means for displacing the screen from a horizontal sorting position to a vertical discharging position and back to the sorting position, and tracks for guiding the screen during its displacement, said tracks having a horizontal portion and a curved, downwardly directed portion connected to the horizontal portion, comprising:

  • a carriage (2), bearings (13) for pivotally supporting the screen (3) approximately in a lateral center of gravity axis in the sides of the carriage, wheels (4) attached to the sides of the carriage in rolling engagement with fixed horizontal beams (1) of the grading plant below the sides of the carriage to enable its horizontal displacement, and two wheels (5) attached to the rear end of the screen and individually guided in the tracks provided with each horizontal beam, the screen being in a position for discharging the retained fractions when the wheels (5) are in a lower part of the curved portion (12) of the tracks, and in a sorting position when the wheels are in a forward part of the horizontal portion (11) of the tracks.

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