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APPARATUS FOR DISPENSING A METERED AMOUNT OF FLUID

  • US 3,795,351 A
  • Filed: 06/05/1972
  • Issued: 03/05/1974
  • Est. Priority Date: 01/05/1971
  • Status: Expired due to Term
First Claim
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1. An apparatus for repetitively dispensing predetermined amounts of liquid from a source of fluid, said apparatus comprising a housing defining a substantially closed chamber of predetermined volume confIgured for receiving such source of fluid, said housing including egress means configured for permitting passage of such liquid between said chamber and the exterior of said housing for dispensing fluid therefrom while precluding entrance of gaseous fluid thereto, and said housing including a plurality of displaceable wall portions adapted to vary said predetermined volume of said chamber in accordance with displacement of each of said portions responsive to application of an external force thereto, said wall portions being in communication with said chamber and configured for independent displacement between a first position defining an initial volume of said chamber and a second position defining a reduced volume of said chamber thereby providing increased pressure on such fluid within said chamber in accordance with displacement from said first to said second position, at least one of said displaceable portions being configured for reversible displacement between said first and second positions for dispensing liquid from said chamber responsive to displacement of said one portion from said first to said second position and for subsequently returning any excess of such liquid to said chamber responsive to displacement of said one portion from said second to said first position, and another of said portions being configured for irreversible displacement from said first to said second position for maintaining the pressure within said container approximately constant intermediate with dispensing such liquid therefrom responsive to operation of said one portion.

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