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Fluid dispensing device

  • US 4,298,000 A
  • Filed: 04/28/1980
  • Issued: 11/03/1981
  • Est. Priority Date: 11/08/1978
  • Status: Expired due to Term
First Claim
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1. A dispensing device adapted for engaging fluidfilled syringe to dispense fluid from the syringe at a slow, steady rate, said device comprising a frame adapted for supporting the syringe;

  • a hose adapted to be coupled to an outlet opening of the syringe; and

    an activating mechanism including a spring coupled to a block movable between a disengaged position out of engagement with the plunger of a syringe supported on the frame to afford insertion or removal of the syringe, and an engaged positon at which the block engages the plunger and the spring applies force to the plunger through the block to cause fluid within said syringe to flow into said hose, wherein the device further includes;

    a metering assembly including a first part having two chambers and an orifice communicating between said chambers;

    a capillary tube extending between said chambers; and

    a second part mounted on said first part for relative movement between a purging position spaced from said orifice so that fluid can flow between said chambers through said orifice, and a metering position blocking said orifice so that fluid can pass between said chambers only through said capillary tube;

    one of said parts being adapted to be releasably attached to the housing of the syringe with an outlet opening of the syringe communicating with one of said chambers and the hose being attached to the metering assembly with the bore of the hose communicating with the other of said chambers;

    said frame comprises support members adapted for engaging and supporting said metering assembly only when the parts of said metering assembly are in their metering position;

    said spring is adapted for applying a uniform force to move the block as the plunger moves into the syringe; and

    said activating mechanism includes structure adapted to secure the metering assembly in the support members when said activating mechanism positions said block in said engaged position.

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