Tokai Rubber Industries, Ltd.

Kabushiki Kaisha Aoi

Toshihiro Kumagai

Kazuhiro Kato

Tsutomu Kodama

Hirokazu Kitamura

Akira Takayanagi

Kinji Hosoya

A tube fitting includes a tubular body, an annular clamping member, a tubular inner pipe, a releasing member, and a sealing ring. The clamping member is disposed axially movably in an axial bore of the body, and includes a claw and an outer peripheral portion. The claw has an inclined surface projecting in a centripetal direction as the inclined surface extends away from an opening of the body, and engages with an outer peripheral surface of a tube fitted into the axial bore via the opening. The outer peripheral portion contacts with a regulatory surface of the body, and is pressed in a centripetal direction thereby, and accordingly presses the claw onto the outer peripheral surface of the tube. The inner pipe is disposed in the tube coaxially with an inner peripheral surface of the tube at an end of the tube. The releasing member includes a tubular base and a leading end. The base is disposed axially movably in the axial bore on an outer side with respect to the regulatory surface. The leading end extends from the base over the regulatory surface to an inner side of the axial bore, and goes between the inclined surface of the claw and the outer peripheral surface of the tube. The sealing ring seals between an inner peripheral surface of the axial bore and an outer peripheral surface of the tube fixed in the axial bore.

Tube fitting

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.

Quick connector

A quick connector includes a male member, a female member and an engager claw member. The male member includes a ring-shaped engager. The female member includes a receiver hole having an opening into which the male member is inserted, a ring-shaped stopper surface disposed oppositely to the opening, and a regulatory inner peripheral surface extending from the periphery of the stopper surface in an axial direction. The engager claw member disposed in the receiver hole of the female member, and it includes a ring-shaped base disposed movably in an axial direction, arms extending from the base to the opening in an axial direction and adapted for being elastically deformable in a radial direction, and a claw disposed so as to extend from each of the arms and adapted for engaging with the engager of the male member. In operation, the claws of the engager claw member are brought into contact with the stopper surface and engaged with the regulatory inner peripheral surface while they are engaged with the engager of the male member. Consequently, the male member in inhibited from displacing not only in an axial direction by the stopper surface, but also in a centrifugal direction by the regulatory inner peripheral surface. Thus, the engaging force associated with the claws is exerted securely, and accordingly the reliability of the quick connector in piping can be improved.

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Tajimi, Japan

Toshihiro Kumagai