Compression fitting with tubing reinforcing insert

• US 4,032,177 A
• Filed: 03/18/1976
• Issued: 06/28/1977
• Est. Priority Date: 03/18/1976
• Status: Expired due to Term

• Current Assignee: David N. Anderson
• Original Assignee: David N. Anderson
• Inventors: Anderson, David N.
• Primary Examiner(s): Callaghan, Thomas F.
• Application Number:
  US05/667,889
• Time in Patent Office: 467 Days
• Field of Search: 285/249, 285/248, 285/250, 285/382.7, 285/24, 285/27, 285/259, 285/256, 285/247
• US Class Current: 285/24
• CPC Class Codes: F16L 33/224 a clamping ring being arranged between the threaded member and the connecting member

Abstract

A compression type end fitting for a non-metal flexible tubing wherein the fitting includes a tubing receiving bore terminating at an internal stop shoulder with a continuing smaller diameter throughbore, a nut sub-assembly of a nut and compression sleeve having a nut receiving throughbore has a tubing reinforcing insert loosely retained within the body and nut sub-assembly when the latter are preassembled preparatory to receiving the tubing through the nut sub-assembly. The insert has a circular flange for loosely retaining the insert within the fitting body bore and has a guide end protruding outwardly of the nut sub-assembly when the latter is assembled to the fitting body to provide for an initial engagement with the tubing and for a prealigning of the tubing, insert and nut sub-assembly throughbore preparatory to pressing the tubing into the fitting and final tightening of the nut sub-assembly on to the fitting.

Claims

1. A compression type end fitting for non-metal flexible tubing including:

a body having threads and a tubing receiving bore terminating at an internal stop shoulder with a continuing smaller diameter through bore,

a nut sub-assembly of a nut and compression sleeve, the compression sleeve having a tubing receiving through bore and an end portion projecting outwardly of the nut, said nut threaded to said body in untightened relation, and

a tubing reinforcing insert positioned within said body and nut sub-assembly when the latter are preassembled in a relatively untightened relation preparatory to receiving said tubing

retaining means on said insert for loosely retaining said insert within said fitting, said retaining means including a flange located between and being larger than said body and sleeve throughbores, said fitting being free of structure preventing abutting of said flange with said stop shoulder; and

guide means on said insert extending outwardly of said compression sleeve end portion through the throughbore thereof when said insert is loosely retained within said fitting by said retaining means and said insert flange abuts said stop shoulder for guiding a tubing free end over said insert when said nut sub-assembly and body are in said untightened condition,

said flange having an outer diameter smaller than the inner diameter of said body tubing receiving bore so as to be transversely movable therein,

whereby on assembly of tubing to said fitting the tubing can be engaged with said outwardly extending guide means to align said insert relative to said tubing before said tubing is pressed into said fitting and before said nut sub-assembly is tightened onto said body,

said compression sleeve having an outwardly extending shoulder spaced from one end thereof and engaging a shoulder on said nut, said sleeve having a surface at the other end thereof engaging an end surface of the body and adapted to be deformed inwardly to engage the tubing and to produce a compression type gripping of the tubing for retaining it within the fitting.

2. The compression type and fitting of claim 1, wherein the only elements having bores through which tubing passes when tubing is assembled thereto are said body and said compression sleeve, whereby to avoid obstruction to the insertion of tubing into said fitting.