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Fluid dispensing device

  • US 4,202,333 A
  • Filed: 11/08/1978
  • Issued: 05/13/1980
  • Est. Priority Date: 11/08/1978
  • Status: Expired due to Term
First Claim
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1. A fluid dispensing device adapted for engaging a fluid-filled syringe to dispense fluid from the syringe at a slow, steady rate, said syringe being of the type comprising an elongate housing including a tubular wall having an open end and an end wall having an outlet opening at the end of the tubular wall opposite its open ends, and a plunger having one end portion positioned within and sealing against the inner surface of said tubular wall and an opposite end portion projecting from the open end of said tubular wall, with the fluid being within said tubular wall between said end wall and said plunger, said device comprising:

  • a metering assembly including a first part having an outer wall and a transverse wall defining chambers within said first part on opposite sides of said transverse wall, said transverse wall having an orifice communicating between said chambers;

    a capillary tube extending through said transverse wall and a second part having a through opening and a portion sealably and movably mounted within the outer wall of said first part for movement relative to said first part between a purging position with said portion spaced from said orifice so that fluid can flow between said chambers through said orifice, and a metering position with said portion blocking said orifice so that fluid can pass said transverse wall only through said capillary tube;

    means adapted for releasably attaching one of said parts of the metering assembly to the housing of a said syringe with the outlet opening of the syringe communicating with the chamber adjacent said one part;

    a hose attached to the other of said parts of the metering assembly with the bore of the hose communicating with the through opening of said other part;

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

    spring means adapted for applying a uniform force against the plunger of the syringe to cause fluid within said syringe to flow through said metering assembly into said hose; and

    activating means for moving said spring means between a disengaged position spaced from the plunger of a said syringe attached to said metering assembly to afford insertion or removal of the syringe and said metering assembly, and an engaged position engaged with said plunger to apply said uniform force, said activating means including securing means for securing the syringe and the metering assembly in said support means when said activating means positions said spring means in said engaged position.

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