Liquid dispenser
First Claim
1. A liquid dispenser comprising:
- a dispensing head comprising a plurality of plungers supported by a plunger plate, drive means for moving the plunger plate upwardly and downwardly, and a plurality of cylinders in which the plungers slidably fit;
a plurality of nozzles arranged at lower ends of the cylinders and having configurations adapted to engage airtightly with openings in upper ends of dispensing tips, the plurality of nozzles being supported by a single nozzle holder, which is built to be detachable from said dispensing head; and
means for attaching and detaching the nozzle holder comprising vertical clamp plates having clamps adapted to be engaged with lower edges of the nozzle holder, elastic members that normally bias the clamp plates upwardly, and means for pressing the clamp plates downwardly against an upward bias of the elastic members.
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Accused Products
Abstract
A liquid dispenser characterized by a dispensing head which is movable upward and downward as a whole and comprises a plurality of plungers supported by a plunger plate, drive means for moving the plunger plate upward and downward, a plurality of cylinders in which the plungers slidably fit, and a plurality of nozzles arranged at the lower ends of the cylinders and having configurations adapted to engage airtightly with holes for holding specific dispensing tips, the plurality of nozzles being supported by a single nozzle holder, which is built to be detachable from said dispensing head. According to the invention, only the nozzle holder that support nozzles has to be replaced with another holder conforming to dispensing tips of different dimensions. The arrangement facilitates the replacement and make the dispenser available at lower cost.
95 Citations
15 Claims
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1. A liquid dispenser comprising:
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a dispensing head comprising a plurality of plungers supported by a plunger plate, drive means for moving the plunger plate upwardly and downwardly, and a plurality of cylinders in which the plungers slidably fit;
a plurality of nozzles arranged at lower ends of the cylinders and having configurations adapted to engage airtightly with openings in upper ends of dispensing tips, the plurality of nozzles being supported by a single nozzle holder, which is built to be detachable from said dispensing head; and
means for attaching and detaching the nozzle holder comprising vertical clamp plates having clamps adapted to be engaged with lower edges of the nozzle holder, elastic members that normally bias the clamp plates upwardly, and means for pressing the clamp plates downwardly against an upward bias of the elastic members. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A liquid dispenser comprising:
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a dispensing head comprising;
a plunger plate;
a plurality of plungers supported by the plunger plate; and
a plurality of cylinders having bores in which the plungers slidably fit;
a drive for moving the plunger plate upwardly and downwardly;
a holder having an array of holes;
a clamp for engaging lower edges of the holder;
elastic members that normally bias the clamp upwardly toward the dispensing head; and
members coupled to the clamp and engagable by the plunger plate to press the clamp downwardly against an upward bias produced by the elastic members. - View Dependent Claims (14, 15)
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Specification