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Automatic waste dump and cleaning system

  • US 4,905,325 A
  • Filed: 07/17/1986
  • Issued: 03/06/1990
  • Est. Priority Date: 07/17/1986
  • Status: Expired due to Term
First Claim
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1. In combination with a lavatory waste tank having a waste drain and a fluid operated waste drain valve mounted in said tank to open and close said drain and tank rinsing means in said tank for rinsing the interior of said tank:

  • (a) flow measuring means adapted to be connected to a source of rinsing fluid under pressure and for measuring at least first and second predetermined volumes of said rinsing fluid flowing therethrough;

    (b) controllable valve means coupled between said flow measuring means and waste drain valve and tank rinsing means; and

    (c) control means, responsive to said flow measuring means for operating, during the period in which said first predetermined volume is measured, said controllable valve means to receive said fluid under pressure from said flow measuring means and deliver said rinsing fluid to the waste drain valve to open said waste drain valve and to the rinsing means and thence to the waste tank and, during a period in which said second predetermined volume is measured, to receive said rinsing fluid under pressure from said flow measuring means and deliver said rinsing fluid to the rinsing means and thence to the waste tank; and

    prevent said rinsing fluid from said flow measuring means from being delivered to said waste drain valve to close said waste drain, whereby said rinsing fluid is supplied through said waste tank for at least a first predetermined period to rinse said tank, and is supplied to said waste tank for at least a second predetermined period to fill the tank.

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