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Dosing pump

  • US 4,405,294 A
  • Filed: 08/18/1981
  • Issued: 09/20/1983
  • Est. Priority Date: 10/11/1980
  • Status: Expired due to Fees
First Claim
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1. A pump, comprising:

  • a housing having a bore therein;

    a plurality of wear-resistant rings pressed into said housing bore and spaced from each other defining a common piston bore;

    a first piston slidable in said common piston bore;

    a second piston slidable in said common piston bore next to said first piston;

    said housing having means defining an inlet and outlet communicating with said housing bore, said plurality of rings spaced from each other to form an inlet space communicating with said inlet and an outlet space communicating with said outlet;

    control means connected to said first piston for moving said first piston through a pumping stroke from said inlet space to the vicinity of said outlet space, said control means engaging with said second piston to move said second piston in the same direction as movement of said first piston through a portion of said stroke, a maximum clearance between said first and second pistons in said piston bore comprising a stroke volume;

    two of said plurality of wear-resistant rings define one additional space; and

    a brake spring extending through said one additional space and engaging said second piston for braking the movement of said second piston.

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