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Gear pump and replaceable reservoir for a fluid sprayer

  • US 6,142,750 A
  • Filed: 11/30/1998
  • Issued: 11/07/2000
  • Est. Priority Date: 11/30/1998
  • Status: Expired due to Fees
First Claim
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1. A spray appliance, comprising:

  • an electric motor;

    a gear pump driven by said electric motor;

    a fluid reservoir in fluid communication with said gear pump and located above said gear pump so that a static head of fluid in said reservoir maintains said gear pump in a primed state; and

    a fluid line leading from said gear pump to a sprayer head, said fluid line having a discharge check valve located therein, said check valve having a cracking pressure higher than said static head of fluid so that fluid passes to said sprayer head only when said gear pump operates to increase pressure in said fluid line above said cracking pressure.

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