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Browse Prior Art Database

Leak Proof Fitting

IP.com Disclosure Number: IPCOM000044620D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Bard, KA: AUTHOR [+3]

Abstract

Automated sample handlers for chromatography applications commonly employ a septum-piercing needle through which fluids pass during the course of using the sample handler. A compression-type connection is made to the needle to prevent leakage of fluid. To accomplish the leak-proof fitting, the sample handler has a needle head 1 provided with a bore 2 extending therethrough. One end of the bore is of reduced diameter to provide a shoulder 3, and the other end of the bore is threaded to receive a compression nut 4. An air needle 5 having an enlarged head extends into bore 2 where the head abuts shoulder 3.

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Leak Proof Fitting

Automated sample handlers for chromatography applications commonly employ a septum-piercing needle through which fluids pass during the course of using the sample handler. A compression-type connection is made to the needle to prevent leakage of fluid. To accomplish the leak-proof fitting, the sample handler has a needle head 1 provided with a bore 2 extending therethrough. One end of the bore is of reduced diameter to provide a shoulder 3, and the other end of the bore is threaded to receive a compression nut 4. An air needle 5 having an enlarged head extends into bore 2 where the head abuts shoulder 3. The septum-piercing needle 6 extends through air needle 5 and has an enlarged inner head 7, one end of which abuts the enlarged head of needle 5 and the other end of which is conically shaped and abuts a conical surface on a coupling
8. Coupling 8 has a second conical surface that abuts a conical surface 9 on the enlarged head of a valve-connecting tube 10. This head abuts compression nut 4 so that when the compression nut is tightened, the enlarged head of tube 9, needle 6 and needle 5, and coupling 8 are compressed therebetween. Coupling 8 is formed of, for example, a plastic material that is more conformable than the mating heads to provide a leak-proof fitting.

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