Bladder actuated pumping system
First Claim
1. A pump comprising a tubular casing, fluid inlet means at one end of said casing, fluid outlet means at the other end of said casing, a tubular support member positioned in said casing in substantial axial alignment therewith, an elastic pumping member disposed about the outer surface of said tubular support member, pump means for expanding and contracting said elastic pumping member so that it alternately expands and seals against the inner surface of said tubular casing and contracts back to said tubular support member, and a fluid flow path through said tubular support member which connects said inlet means to said outlet means, said fluid flow path being fluidly connected to a volumetric area which is partially defined by at least a portion of the exterior of said elastic pumping member disposed closest to said one end of said casing and which volumetric area fluidly communicates with said fluid inlet means.
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Accused Products
Abstract
A pumping system using an air actuated bladder type member to propel liquids out and to refill the pump. Invention covers such novel pumps and an overall dispensing system. Useful in pumping and dispensing liquids generally and is especially useful in dispensing polyurethane chemicals.
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Citations
9 Claims
- 1. A pump comprising a tubular casing, fluid inlet means at one end of said casing, fluid outlet means at the other end of said casing, a tubular support member positioned in said casing in substantial axial alignment therewith, an elastic pumping member disposed about the outer surface of said tubular support member, pump means for expanding and contracting said elastic pumping member so that it alternately expands and seals against the inner surface of said tubular casing and contracts back to said tubular support member, and a fluid flow path through said tubular support member which connects said inlet means to said outlet means, said fluid flow path being fluidly connected to a volumetric area which is partially defined by at least a portion of the exterior of said elastic pumping member disposed closest to said one end of said casing and which volumetric area fluidly communicates with said fluid inlet means.
Specification