# US 5,341,566 A · Conduit attachment

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- Number: US 5,341,566 A
- Document ID: US5341566A
- Status: Granted
- Kind: A
- Application number: 08/059,794
- Filed: 1993-05-10
- Granted: 1994-08-30
- Earliest claimed: 1993-05-10
- Assignees: Eaton Corporation
- Inventors: Algird R. Quitschau; Dennis K. Seals
- Web page: https://patentgrep.com/patent/US5341566A

## CPC

- F16L 13/166: {Deformed by radially expanding an inner part (F16L13/168 takes precedence)}
- B21D 39/06: of tubes in openings, e.g. rolling-in
- B23P 11/005: {by expanding or crimping}
- F16B 17/006: {of rods or tubes to sheets or plates}
- Y10T 29/49359: Cooling apparatus making, e.g., air conditioner, refrigerator
- Y10T 29/49423: including metal deforming
- Y10T 29/49428: Gas and water specific plumbing component making
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of attaching and sealing a straight walled tubular fitting to a block or valve body. The end of the tubing is closely fitted in a counterbore which has an undercut groove with a recessed elastomeric seal ring with the inner edges of the groove chamfered. A tubular insert having a thickened wall portion at one end is received in the tube so the thickened wall is coincident with the seal ring. A tapered punch is driven in the thickened end of the insert, causing the tubing wall to bulge locally and expand into the chamfered groove to secure the tube in the block and seal against the seal ring.

## Claims

### Claim 1

A method of attaching and sealing a relatively thin walled fluid conduit to a ported block or valve body comprising:
(a) forming a bore in the block or valve body communicating with a port and forming an undercut groove in the bore and disposing a resilient seal ring therein;
(b) inserting the end of said conduit in said bore and said seal ring;
(c) disposing a tubular insert with a thickened wall portion of the insert against the wall of said conduit portion in said bore; and,
(d) inserting a tool and expanding the thickened wall and bulging the wall of said conduit into said groove and sealing said conduit against said seal ring.

### Claim 2 (depends on 1)

The method defined in claim 1, wherein the step of inserting a tool includes inserting a tapered punch.

### Claim 3 (depends on 1)

The method defined in claim 1, wherein said step of forming an undercut groove includes chamfering the inner edges of said groove.