Tube with compression fitting and flared fitting used with connection body and method of making same

Patent metadata

Field	Value
Publication number	US-10816116-B2
Application number	US-201916284494-A
Country	US
Kind code	B2
Filing date	Feb 25, 2019
Priority date	Sep 5, 2008
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A high-pressure tube compression fitting/flared fitting for use in combination with a thick-walled tube and a connection body wherein a sleeve is in engagement with a thick-walled tube. The sleeve is generally cylindrically shaped with the exterior thereof coated and then etched. The sleeve includes a first and second sharp inner circumferential biting edges which interengage and bite into and through the exterior of the end portion of the thick-walled tube and into the wall portion of the end portion of the thick-walled tube without narrowing the passageway through the thick-walled tube. The process for making the fitting includes placing an end portion of the thick-walled tube into engagement with a tube engaging surface of a tapered generally cylindrical wall of a guide rod.

First claim

What is claimed is:

1. A process for making a tube fitting with a tube, the tube having a tube end portion formed by a cylindrical tube wall having a cylindrically shaped interior surface and a cylindrically shaped exterior surface, the cylindrically shaped interior surface defining an interior passageway, the process comprising the steps of:
sliding a sleeve over the tube end portion, the sleeve having at a forward end portion a radially inner annular cavity forming an annular shoulder that terminates at an inner circumferential biting edge;
positioning the sleeve and tube end portion in a die, the die including a guide rod having a tapered flaring surface for engaging the interior surface of the tube wall and a tapered sleeve engaging surface radially outwardly and rearwardly offset from the tapered flaring surface of the guide rod;
axially driving the die relative to the sleeve and tube end portion so that
(a) the tapered flaring surface of the guide rod radially outwardly flares a leading portion of the tube wall, and
(b) the tapered sleeve engaging surface radially inwardly urges the inner circumferential biting edge of the sleeve into the exterior surface of the tube wall, thereby extruding the tube wall into the annular cavity.

2. The process of claim 1 , including using a gland to restrain the sleeve in position with respect to the die.

3. The process of claim 1 , wherein the exterior of the sleeve is coated with a diamond embedded chromium coating.

4. The process of claim 3 , wherein the coating on the exterior of the sleeve is etched.

5. The process of claim 1 , including applying a lubricant to the die prior to placing an end portion of a tube into engagement with the die.

6. The process of claim 1 , including using a gland to restrain the sleeve in position with respect to the die, and wherein the step of driving the die into the tube continues until the die abuts the gland.

7. The process of claim 1 , wherein the tapered flaring surface and the tapered sleeve engaging surface are unitary with respect to one another.

8. The process of claim 1 , wherein the tapered flaring surface of the guide rod radially outwardly flares a leading portion of the tube wall simultaneously with the tapered sleeve engaging surface radially inwardly urging the inner circumferential biting edge of the sleeve into the exterior surface of the tube wall.

9. The process of claim 1 , wherein the leading portion of the tube wall is flared by the tapered flaring surface to the leading end of the tube wall.

10. A process for making a tube fitting for use in combination with a tube, the tube including a passageway therethrough defined by a cylindrically shaped interior surface, the tube including a cylindrically shaped exterior surface, the tube including a wall portion, and, the tube including an end portion, the process comprising the steps of:
placing an end portion of the tube into engagement with a die, the end portion of the tube engages a surface of a tapered, generally cylindrical, wall of a guide rod of the die such that the interior surface of the tube engages the tube engaging surface of the tapered, generally cylindrical wall of the guide rod of the die, the tube further engages a transitioning surface from the guide rod to the bottom of the die;

the die supported by a driving piston;
sliding a sleeve over the tube, the sleeve including a first end portion, an intermediate portion and a second end portion; an inner bore through the first end portion, the intermediate portion and the second end portion of the sleeve; the inner bore of the sleeve including an interior surface; the sleeve including an exterior surface;
the first end portion of the sleeve including a first varying wall thickness between the interior surface and the exterior surface of the sleeve proximate the first end portion; the second end portion of the sleeve including a second varying wall thickness between the interior surface and the exterior surface of the sleeve proximate the second end portion;
the intermediate portion of the sleeve including a varying wall thickness between the interior surface and the exterior surface of the sleeve proximate the intermediate portion; the inner bore of the sleeve through the first end portion including a first shoulder terminating in a first sharp inner circumferential biting edge; the inner bore of the sleeve through the first end portion including a second shoulder terminating in a second sharp inner circumferential biting edge; and, the first sharp inner circumferential biting edge having a first diameter and the second sharp inner circumferential biting edge having a second diameter;
restraining, using a gland, the sleeve in position with respect to the sleeve and the die;
driving the die into the tube and the sleeve with the driving piston flaring the end portion of the tube and securing the sleeve into forceful engagement with the tube, the die forcing the first sharp inner circumferential biting edge into and through the exterior of the end portion of the tube and into the wall portion of the end portion of the tube without narrowing the passageway of the tube, and, the die forcing the second sharp inner circumferential biting edge into and through the exterior of the end portion of the tube and into the wall portion of the end portion of the tube without narrowing the passageway of the tube; and
wherein the end portion of the tube is flared to the leading end of the tube wall.

11. The process of claim 10 , wherein the exterior of the sleeve is coated with a diamond embedded chromium coating.

12. The process of 11 , wherein the coating on the exterior of the sleeve is etched.

13. The process of claim 10 , further comprising the step of applying a lubricant to the die prior to placing an end portion of athe tube into engagement with the die.

14. The process of claim 10 , wherein the step of driving the die into the tube continues until the die abuts the gland.

15. The process of claim 10 , wherein the step of driving the die into the tube and the sleeve with the driving piston, flaring the end of the tube, and securing the sleeve into forceful engagement with the tube, includes forcing the first and second sharp inner circumferential biting edges into and through the exterior of the end portion of the tube and into the wall portion of the end portion of the tube equidistantly without narrowing the passageway of the tube.

Assignees

• Parker Hannifin Corp

Inventors

• Ciprich Samuel
• Bernosky Matthew

Classifications

• F16L19/10

  the profile of the ring being altered · CPC title

• Y10T29/49428

  Gas and water specific plumbing component making · CPC title

• Y10T29/4994

  Radially expanding internal tube · CPC title

• F16L19/045

  consisting of cutting edges on one of the connecting parts which penetrate into the wall of the pipe · CPC title

• F16L19/028 Primary

  the collars or flanges being obtained by deformation of the pipe wall · CPC title