×

Pump

  • US 5,577,896 A
  • Filed: 06/24/1994
  • Issued: 11/26/1996
  • Est. Priority Date: 06/25/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A pump provided with a first pump mechanism and a second pump mechanism, the pump comprising:

  • a housing having therein a first pump chamber, a second pump chamber, an intake port communicated with said first pump chamber, and a discharge port communicated with said second pump chamber;

    first valve means disposed in a communicating passage between said first pump chamber and said second pump chamber, which opens said communicating passage when said second pump chamber is expanded and closes said communicating passage when said second pump chamber is compressed;

    a piston reciprocatingly disposed in said housing, which expands said second pump chamber when said first pump chamber is compressed and compresses said second pump chamber when said first pump chamber is expanded in accordance with movement thereof;

    second valve means disposed near said intake port in said housing, which opens so as to permit fluid to flow into said first pump chamber when said first pump chamber is expanded and closes so as to prevent fluid in said first pump chamber from flowing out of said first pump chamber when said first pump chamber is compressed; and

    third valve means disposed near said discharge port in said housing, which opens so as to discharge pressurized fluid in said second pump chamber when said second pump chamber is compressed and closes when said second pump chamber is expanded,wherein said second valve means is slidably disposed in said housing and engagable with said piston, said second valve means slides in accordance with the reciprocating movement of said piston, and thereby opens and closes said first pump chamber.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×