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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
First Claim
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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, anda 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 tubingretaining 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.

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