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Pump particularly useful in respirator apparatus and exhalation valve assembly thereof

  • US 5,683,232 A
  • Filed: 10/23/1995
  • Issued: 11/04/1997
  • Est. Priority Date: 02/28/1994
  • Status: Expired due to Term
First Claim
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1. Respirator apparatus comprising:

  • a pump housing having an inlet at one end, an outlet at the other end, and a cylinder between said inlet and outlet;

    a piston reciprocatable axially within said cylinder and dividing its interior into an inlet chamber communicating with said inlet, and an outlet chamber communicating with said outlet;

    an exhalation valve coupled to the pump housing outlet via a coupling fitting;

    and a one-way valve in said coupling fitting and leading to the atmosphere;

    said one-way valve being normally closed, but automatically opening by a negative pressure within said coupling fitting to connect the interior of said coupling fitting to the atmosphere.

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