Multi-mode differential fluid displacement pump
First Claim
1. A multi-mode, differential displacement pump for obtaining two different measured doses with high resolution in a single stroke,said pump comprising an elongated chamber carrying first and second pistons therein,said first piston defining a first volume being reciprocally mounted in said chamber,said second piston defining a second volume being reciprocally mounted in said chamber,said chamber having a first and a second portion,means for moving in a single stroke, only one of said pistons in said first portion of said chamber to define a first measured dose and said one piston along with the other of said pistons in said second portion of said chamber to define a second measured dose different from said first measured dose, andmeans for positioning said other piston at a predetermined position in said chamber.
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Accused Products
Abstract
A multi-mode, differential fluid displacement pump provides for at least two different measured doses. The pump has a chamber in which are mounted a first diameter piston and a second diameter piston defining first and second volumes for reciprocation in the chamber. Means are provided for reciprocating the pistons as desired to obtain predetermined volume changes corresponding to movement of either or both of the first and second pistons. A system of operation and a mixing chamber useful in connection with dosages from the pump are interconnected with the pump.
94 Citations
9 Claims
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1. A multi-mode, differential displacement pump for obtaining two different measured doses with high resolution in a single stroke,
said pump comprising an elongated chamber carrying first and second pistons therein, said first piston defining a first volume being reciprocally mounted in said chamber, said second piston defining a second volume being reciprocally mounted in said chamber, said chamber having a first and a second portion, means for moving in a single stroke, only one of said pistons in said first portion of said chamber to define a first measured dose and said one piston along with the other of said pistons in said second portion of said chamber to define a second measured dose different from said first measured dose, and means for positioning said other piston at a predetermined position in said chamber.
Specification