# US 8,769,798 B2 · Tube fitting assembly

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- Number: US 8,769,798 B2
- Document ID: US8769798B2
- Status: Granted
- Kind: B2
- Application number: 13/068,391
- Filed: 2011-05-10
- Published: 2012-11-15
- Granted: 2014-07-08
- Earliest claimed: 2011-05-10
- Applicants: Patrick Rieth
- Inventors: Patrick Rieth
- Web page: https://patentgrep.com/patent/US8769798B2

## CPC

- F16L 19/061: {a pressure ring being arranged between the clamping ring and the threaded member or the connecting member}
- B25B 27/023: {using screws}
- B25B 27/06: inserting or withdrawing sleeves or bearing races
- B25B 27/10: inserting fittings into hoses
- F16L 19/06: in which radial clamping is obtained by wedging action on non-deformed pipe ends
- F16L 19/065: the wedging action being effected by means of a ring
- E05Y 2900/50: for vehicles
- Y10T 29/49904: Assembling a subassembly, then assembling with a second subassembly
- Y10T 29/49908: Joining by deforming
- Y10T 29/49909: Securing cup or tube between axially extending concentric annuli
- Y10T 29/49927: Hollow body is axially joined cup or tube
- Y10T 29/49938: Radially expanding part in cavity, aperture, or hollow body
- Y10T 29/49947: by applying separate fastener
- Y10T 29/49948: Multipart cooperating fastener [e.g., bolt and nut]
- Y10T 29/53843: Tube, sleeve, or ferrule inserting or removing
- Y10T 29/53848: having screw operator
- Y10T 29/53952: Tube sleeve or ferrule applying or removing
- Y10T 29/53987: Tube, sleeve or ferrule
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
- E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A tube fitting for sealing an end of a tube uses a notch formed in the exterior surface of the tube as a sealing seat. An internally threaded body is configured to receive an externally threaded end of a nut, while the body and the nut are mounted in a surrounding relationship to the tube end. A ferrule mounted between the nut and the tube is forced to plastically deform and move into the notch to thereby seal the tube end.

## Claims

### Claim 1

A method of assembling a tube fitting, comprising the steps:
providing a cylindrical tube having an exterior surface, a longitudinal axis and a tube end, said tube being provided with a notch formed in the exterior surface adjacent the tube end, wherein the notch is defined by a first arcuate surface and a second straight surface extending transversely to the longitudinal axis of the tube;
providing a first tube fitting member having an inner bore and an internally threaded end;
providing a second tube fitting member having a central aperture extending through a length thereof, said second fitting member comprising an externally threaded end;
providing a deformable tube gripping member having a front end;
positioning the tube gripping member between the second tube fitting member and the tube;
joining the first tube fitting member with the second tube fitting member such that the front end of the tube gripping member is forced to plastically deform while fitting into the notch and into sealing engagement with the tube end.

### Claim 2 (depends on 1)

The method of claim 1, wherein the tube gripping member is mounted for sliding movement along exterior surface of the tube, while the front end deforms upon contact with the first arcuate surface.

### Claim 3 (depends on 2)

The method of claim 2, wherein the first tube fitting member comprises an arcuate camming surface located opposite the first arcuate surface, and wherein the front end of the tube gripping member fits between the camming surface and the first arcuate surface.