Patent ID: 6390720
Filing Date: 2002-05-21
Classification: F16L,Y10T

Abstract:
A connection (10) to a machine (14) comprising:a fitting (16) adapted to be connected to a machine (14) and adapted to receive an end of a tube for attachment thereto, the fitting comprising a collet (18) and a nut (24) for compressing the collet onto the outside surface of a tube; a tube (12) having an end (30) disposed within the fitting and having an area (32) in contact with the collet; and a plurality of grooves (36) formed on the outside surface (28) of the tube proximate the collet and a region of residual compressive stress in the tube proximate a radially inner surface of each of the plurality of grooves, wherein a first (44) of the plurality of grooves is located in an area of the tube not in contact with the collet proximate an end of the collet opposed the machine.