Coupler for tubing

A coupler for tubing comprising a housing having first and second end portions and a bore therethrough extending from the first end portion to the second end portion thereof, said housing first end portion including means for securement to a member, said housing second end portion having longitudinally spaced internal shoulders and an exterior opening into said housing bore, one shoulder of said housing being located nearer said opening than the other shoulder of said housing, lock ring means having a flexible inner frusto conical portion terminating in an annular tube-contacting edge, rigid annular spacer means, annular resilient seal means, said ring and spacer and seal means seated side by side in a longitudinal abutting relationship between said shoulders in general coaxial alignment with said housing bore, said ring means being adjacent said other shoulder, said spacer means being next to the frusto conical portion of said ring means and between the ring means and said seal means, said seal means for providing a fluid seal between said coupler and a tube when said tube is inserted into said housing through said housing bore from said housing second end portion, said ring means frusto conical portion being shiftable from a first position in which its internal diameter is smaller than the outer diameter of said tube into a second position in which its internal diameter is less than its internal diameter when in its first position, said ring and spacer means being mutually shiftable relative to said housing between said shoulders toward said one shoulder through the influence of fluid pressurization of said tube after insertion into said housing bore and through the ring and seal and spacer means in said housing second end portion to position said ring means frusto conical portion in its said second position with the annular edge of said ring means circumferentially engaging said tube and with said seal means contacting said one shoulder whereby the tube will be locked within said housing, said one shoulder constituting abutment means for contacting said seal means to locate said ring means frusto conical position in its said second position and to prevent withdrawal of said ring and seal and spacer means from said housing second end portion through said opening therein.

A coupler for tubing comprising a housing having a first and second end portions and a bore therethrough extending from the first end portion to the second end portion thereof, said housing first end portion including means for securement to a member, said housing second end portion having longitudinally spaced internal shoulders and an exterior opening into said housing bore, one shoulder of said housing being located nearer said opening than the other shoulder of said housing, lock ring means having a flexible inner frusto conical portion terminating in an annular tube-contacting edge, rigid annular spacer means, first and second annular resilient seal means, said ring and spacer and both seal means seated side by side in a longitudinal abutting relationship between said shoulders in general coaxial alignment with said housing bore, said first seal means being positioned adjacent said one of the housing shoulders and said second seal means being positioned adjacent said other of the housing shoulders, said ring means being positioned next to said second seal means, said spacer means being positioned between said ring means and first seal means next to the frusto conical portion of the ring means, said first and second seal means for providing a fluid seal between said coupler and a tube when said tube is inserted into said housing through said housing bore from said housing second end portion, said ring means frusto conical portion being shiftable from a first position in which its internal diameter is of one diametrical value and a second position in which its internal diameter is less than said one diametrical value and the outer diameter of said tube, said ring and spacer and second seal means being mutually shiftable relative to said housing between said shoulders toward said one shoulder through the influence of fluid pressurization of said tube after insertion into said housing bore and through the ring and spacer and both seal means in said housing second end portion to position said ring means frusto conical portion in its said second position with the annular edge of said ring means circumferentially engaging said tube and with said first seal means contacting said one shoulder whereby the tube will be locked within said housing, said one shoulder constituting abutment means for contacting said first seal means to locate said ring means frusto conical portion in its said second position and to prevent withdrawal of said ring and spacer and both seal means from said housing second end portion through said opening therein.