Patent ID: 6419278
Filing Date: 2002-07-16
Classification: F16L

Abstract:
In a pressure fluid conduit coupling comprising a nipple tube fitting having a shank with an external maximum outside diameter in the range of about 0.25 inches to about 0.75 inches and being made of rigid material, an elastomeric hose having an interior wall surface of said elastomeric material and an open end adapted to telescopically receive an open end of said nipple tube fitting shank with the external circumferential surface of said nipple tube fitting shank engaging said interior wall surface of said hose, and a crimp-collar sleeved over and shrunk-deformed onto said hose open end and being generally axially coextensive with the axial extent of overlap of said hose telescopically on said nipple tube fitting shank, the improvement in combination therewith wherein said nipple tube fitting shank is provided on its external circumferential surface with a plurality of external circumferentially continuous locking and sealing ribs and grooves including first and second grooves spaced axially from one another by a predetermined distance W2 occupied by an intervening one of said ribs, each of said first and second grooves having an axial width dimension W1, and each of said first and second grooves having a bottom wall formed at a radial depth represented by the predetermined dimension H, as measured from the external maximum outside diameter of said external circumferential surface of said nipple fitting shank in the space between said first and second grooves, each of said first and second grooves being defined by generally radially extending axially spaced sidewalls facing one another and a bottom wall extending axially between the associated groove sidewalls, said external circumferential surface of said nipple tube rib between said first and second grooves having a cylindrical contour of constant diameter, and wherein the junction of each of said groove sidewalls with said external circumferential surface of said nipple tube fitting shank rib defines a circumferentially continuous sharp edge formed by an unaltered lathe cut turning and configured generally as a 90 degrees junction plus or minus about 5 degrees characterized as a sharp linear line-to-line intersection lying in a plane defined by the tube fitting shank axis and any radius extending from the same, and wherein said groove depth dimension H ranges between about 0.004 inches to about 0.015 inches, wherein said groove width dimension W1 ranges between about 0.025 inches to about 0.040 inches, and wherein said groove spacing dimension W2 ranges from about 0.055 inches to about 0.070 inches.