A quick connector comprises a tubular-shaped female member, a tubular-shaped male member, and an engager member which comprises a "C" ring-shaped and tapered stopper whose diameter can be increased in said annular-shaped concave, and which has the smaller diameter ends having the small diameter at the inner side of said female member and having the large diameter at the side of said opened flange to engage said engager projection, and which has the larger diameter ends having the diameter larger than that of said opened flange of said female member to face the inside end surface of said opened flange; a regulator which is installed in the axial direction to said stopper, and which is projected in the centrifugal directions than do the larger diameter ends of said stopper, and which is brought into contact with the inner peripheral surface of said annular-shaped concave to regulate the displacement in the radial direction of said stopper; and a linkage for connecting said stopper and said regulator. In the quick connector, the smooth insertion of the male member and the satisfactory diameter enlargement of the stopper can be obtained.

A spring retainer clip used with a quick-connect coupling for coupling a male connector having an outwardly extending protrusion in a bore of a female connector having an inwardly extending protrusion wherein the outwardly and inwardly extending protrusions are separated by an annular gap. The spring retainer clip comprises a ring having an axially extending collar for fitting around the male connector and a radially extending base unitary with the collar. A plurality of spring arms, unitary with and extending axially from the radially extending base, have transverse T-bars at free ends thereof adapted to extend through the gap between the protrusions and block movement of the protrusions past one another. Consequently, the male and female connectors cannot be separated if the width of the gap is substantially reduced. Tabs on the base between the spring arms extend axially to engage the bore in the female connector so as to stabilize the spring retainer clip within the bore when the T-bars are disposed in the gap and when the base and collar are disposed outside of the bore. In order to have an more robust configuration with a relatively thick collar and thick base, the spring retainer clip is molded of powdered steel.

A connector assembly comprising a retainer mounted axially to tubing, conduit, rod, cable or other axially loaded components behind a male insert having an annular ring or bead or an expanded end portion. Upon assembly of the male insert and retainer into a female receptor, the retainer arm's spring extensions compress to permit entry into the female receptor and once past an annular protrusion in the receptor, resume their normal state. This prevents the female receptor and the male insert from disengaging by the interference between the annular ring, the annular protrusion and the retainer arms and also prevents debris from entering into the joint connection, thereby affecting the operation of the retainer and any sealing means.

A connector is provided for a small diameter pipe that has been formed to include an annular swelled part near the end of the pipe. The connector includes a body with a communication hole extending axially therethrough. A chamber extends axially into one end and joins the communication hole. A window is formed through portions of the connector body defining the chamber, and a pawl extends across the window. The pawl includes a central portion that projects into the chamber. The pawl is configured to engage the annular swelled part of the pipe for holding the pipe in the connector body. The connector further includes a releasing member rotatably mounted around the connector body in proximity to the pawl. Outer circumferential portions of the releasing member define a cam wall configured such that rotation of the releasing member into a selected rotational orientation will deflect the pawl outwardly to enable release of the pipe.

A connector for a pipe joint has a plurality of ridges formed on its inner surface and engaging the outer surface of a pipe. An annular bush fitted between the connector and the pipe inserted therein also has a plurality of ridges formed on its inner surface and engaging the outer surface of the pipe. These ridges can hold the pipe against any undesirable axial or radial displacement from the connector.