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Push-in tube connector

  • US 4,335,908 A
  • Filed: 05/19/1980
  • Issued: 06/22/1982
  • Est. Priority Date: 05/19/1980
  • Status: Expired due to Term
First Claim
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1. A preassembled fitting for tubes wherein a final fluid tight joint may be made solely by insertion of a tube therein, comprising a body having a bore therein and a tubing support forming an annular space for receipt of a tube, said bore having an entrance at one end of said body and terminating at a shoulder of lesser diameter than said bore,a nut having a bore therein for receipt of a tube, said nut having an inwardly extending tubular portion terminating in an end ring of a diameter to fit within said body bore,means for releaseably interengaging said nut and body at a position wherein said end ring of said nut is spaced a short distance from said body shoulder,an elastomeric ring seal in said body member, said ring seal having a first sealing portion disposed between and in direct engagement with said shoulder and said end ring and adapted to be compressed thereby to provide sealing engagement between said body and said nut, said nut further having an internal frusto-conical surface between said bore and said end ring and disposed in said annular space,a radially expandable and contractable sleeve-like gripping member having a frusto-conical outer surface in engagement with said inner surface of said nut and slidable relative thereto, said gripping member having gripping means on the inner surface thereof adapted for engagement with the outer surface of an inserted tube,said ring seal having an abutment portion thereon radially inwardly of said sealing portion, said gripper member having abutment means at the axially inner end thereof adapted for direct engagement with said ring seal abutment portion to limit inward movement of said gripper member and to urge same axially outwardly toward a tube gripping position,an o-ring seal in said nut bore for sealing the outer surface of an inserted tube, anda further tube engaging portion on said ring seal adapted to be compressed by inserted tubing to seal said tube and to increase axial sealing pressure between said nut and body.

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