US 5,467,899 AGranted

Dispensing device for flowable materials

AssigneeLiquid Control Corporation

InventorKenneth L. Miller

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Abstract

A device which positively dispenses small, accurately measured, amounts of a flowable material, such as a resin, epoxy, etc. A pair of reciprocal pistons are movably mounted, each in a respective fluid pressure chamber, formed in a main body of a housing. One of the pistons moves a material dispense rod within a first section of a bore formed in a tubular portion of the housing. The second piston moves a sleeve which is telescopically mounted on the tubular housing between a material load position wherein flowable material is admitted into the first bore section, and a material discharge position wherein the first bore section is in communication with the second bore section. The dispense rod is moved into the first bore section to positively displace a predetermined amount of material from the device by movement of this same amount of material from the first bore section into the second bore section through a communication channel formed in the sleeve, thereby dispensing the same amount of material from a material outlet opening of the second bore section with each stroke of the dispense rod.

Claims23

Dependent claims

A dispenser for dispensing a predetermined amount of a flowable material from a supply of said material including:

a housing formed with a material receive chamber and a separate material dispense chamber, said receive chamber having a material inlet opening and said dispense chamber having a material outlet opening;
first means movable between first and second positions for selectively providing material communication between said material receive and dispense chambers, said first means permitting the flow of material between the material receive and dispense chambers and for trapping said material in said receive chamber by blocking the material inlet opening when in the first position, and for preventing communication between said receive and dispense chambers and for unblocking the material inlet opening when in the second position to permit the flow of material into the receive chamber, and for blocking the material inlet opening before providing communication between the receive and dispense chambers when moving between the second and first positions;
second means for forcing a predetermined amount of material out of the receive chamber and into the dispense chamber and subsequently out of the material outlet opening when said first means is in the first position wherein the receive chamber is in communication with the dispense chamber and the material inlet opening is blocked;
and
third means for selectively moving the first means between the first and second positions.

2 more elements

A dispenser for dispensing a small measured amount of a flowable material from a supply of said material including:

a housing having a main body formed with a first fluid pressure chamber which is adapted to be connected to a source of fluid pressure;
a first piston movably mounted in the first fluid pressure chamber;
a material dispense rod movable in a material dispense direction by the first piston;
first spring means for biasing the piston and dispense rod in a direction opposite to the material dispense direction;
a tubular portion mounted on the main body of the housing and formed with an axial bore, said bore having a first section in which the material dispense rod is movable and a second section, each of said bore sections having separate material inlet and outlet openings;
a sleeve telescopically slidably mounted on the tubular portion and movable between material load and dispense positions, said sleeve having a hollow bore formed with an annular inner recess which aligns with the material outlet opening of the first bore section and the material inlet opening of the second bore section when in the material dispense position to provide communication between the first and second bore sections;
a second fluid pressure chamber formed in the housing which is adapted to be connected to a source of fluid pressure;
a second piston movably mounted in the second fluid pressure chamber for moving the sleeve from the material load position to the material dispense position;
second spring means for biasing the sleeve toward the material load position;
material supply means formed on the sleeve for permitting the flow of material into the first bore section of the tubular portion when the sleeve is in the material load position;
and
said first piston moving the material dispense rod a predetermined stroke length into the first bore section when the sleeve is in the material dispense position to discharge a predetermined amount of material from said first bore section and into the second bore section through the annular inner recess of the sleeve to dispense a measured amount of said material from said second bore section and out of the outlet opening of said second bore section.

9 more elements

Dependencies are inferred from the claim text.