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Collection tank

  • US 9,260,049 B2
  • Filed: 04/30/2014
  • Issued: 02/16/2016
  • Est. Priority Date: 10/06/2006
  • Status: Active Grant
First Claim
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1. A mobile backfill system for collecting material, comprising:

  • a collection tank comprising a body havinga closed end,an open end opposite the closed end and having a generally circular periphery,a central, generally cylindrical section extending between the closed end and the open end, anda door having a generally circular periphery and that is pivotable about a first axis between a first position, at which the door is spaced from the open end of the body, and a second position, at which the generally circular periphery of the door seats against the generally circular periphery of the open end, thereby closing the open end;

    a vacuum pump connected to the collection tank that draws an air stream through the collection tank for carrying material into the collection tank; and

    two over center linkages, each over center linkage extending between a respective first pivotal connection between the over center linkage and the door and a respective second pivotal connection between the over center linkage and the tank body so that each over center linkage is movable, when the door is at the second position, over center to a state at which the over center linkage biases the door into the second position.

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