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Browse Prior Art Database

Positive Displacement Fluid Dispenser

IP.com Disclosure Number: IPCOM000075475D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Bhatt, KH: AUTHOR [+2]

Abstract

This fluid dispenser allows precisely metered amounts of viscous fluid to be dispensed through hypodermic needles with minimal post-dispense drip.

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Positive Displacement Fluid Dispenser

This fluid dispenser allows precisely metered amounts of viscous fluid to be dispensed through hypodermic needles with minimal post-dispense drip.

Viscous fluid 1, for example a resin, under pressure fills the hollow port 2 in support block 3 which holds dispensing needle 4. Fluid 1 opens check valve 5 filling the passage to piston 6. A seal formed by piston 6 and resilient pad 7 prevents fluid from flowing to needle 4. When a hydraulic cylinder, not shown, attached to bracket 8, draws piston 6 back, fluid 1 then enters the vacated area of block 3 providing a measured volume of fluid which is dispensed when piston 6 is returned to its starting position.

By providing several needle assemblies in block 3 and by making fine adjustments in piston displacement by adjusting nut 9, many identical volumes of fluid may be dispensed with one cycle of the dispenser. By adjusting the hydraulic cylinder stroke, the amount of fluid dispensed by all needles may be simultaneously adjusted.

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