JP3104130B2 - Pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint used for a gas meter or the like.

[0002]

2. Description of the Related Art As a pipe joint for a gas meter, one having a structure as shown in FIG.
882). When the cap nut 3 is attached to the outer surface of one end of the elbow-shaped joint body 1 in a retaining shape, a concave groove 4 having a semicircular cross section is formed on the outer periphery of one end of the joint body 1. 4 is fitted with a retaining ring 2 having a circular cross section with a part of the circumference cut away.
With this, the flange 6 protruding inward from the cap nut 3 is engaged in a retaining shape. At the time of assembling, as shown by a two-dot chain line F in FIG. 4, before the retaining ring 2 is fitted into the concave groove 4, the cap nut 3 is previously positioned above the concave groove 4 on one end side of the joint body 1. The retaining ring 2 is mounted until it reaches the position, the groove 4 is exposed below the cap nut 3, and the retaining ring 2 is expanded with a jig and fitted into the groove 4 while maintaining this state. Thus, even when the cap nut 3 is lowered below the outer surface at one end of the joint main body 1, the collar 6 is caught on the retaining ring 2, so that the cap nut 3 is set in the retaining state.

[0003]

However, in the above-mentioned pipe joint, assembling procedure, as described above, unless the cap nut 3 is attached before the retaining ring 2 is attached, the pipe joint cannot be assembled. It is necessary to increase the H dimension on the side. If the H dimension is made as short as possible, it becomes difficult to attach the retaining ring 2 and, in the worst case, it becomes impossible to assemble.

[0004] The present invention has been made in view of such circumstances, and by devising the cross-sectional shape of the retaining ring, assembly can be facilitated, and the H dimension can be made as short as possible. An object of the present invention is to provide a pipe joint which can be made smaller and more compact.

[0005]

A pipe joint according to the present invention has an elbow-shaped joint main body having a concave groove formed on the outer periphery at one end side, and is fitted into the concave groove of the joint main body. gradually formed into a tapered surface of the large diameter in accordance with from one end to the other end facing the end direction, the minimum outer diameter of one end is formed in substantially the same diameter as the outer diameter of said one end of the joint body, the minimum outside of the other end The diameter is formed larger than the outer diameter of the one end side of the joint body, and the inner diameter is formed smaller than the outer diameter of the one end side of the joint body and larger than the diameter of the concave groove. Part is cut out, a retaining ring having a wedge-shaped cross section having elasticity that can be expanded and contracted and deformed, and after the retaining ring is fitted into the concave groove of the joint main body, one end of the joint main body having the concave groove is formed. Push-fitting on the outer surface through the diameter reduction deformation of the retaining ring It is an inner diameter of a diameter smaller than the maximum outer diameter of the one end side of the outer diameter and the stopper minimum outer diameter the omission in the larger diameter than the stop ring of the ring of the joint body
And a cap nut protruding inwardly from the flange.

[0006]

Function: By forming the retaining ring into a wedge-shaped cross section, the retaining ring is fitted into the concave groove of the joint body as an assembling procedure. The cap nut can be pushed and mounted via the diameter reduction deformation of the retaining ring. By pushing in the retaining ring, it is possible to obtain a retaining state in which the collar is hooked on the retaining ring. Therefore, as in the above-described conventional example, it is sufficient to mount the retaining ring once after the fitting of the retaining ring, without the troublesome trouble of mounting the retaining ring once the cap nut is once mounted. It is easy and the H dimension at one end of the joint body can be reduced as much as possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of a pipe joint for a gas meter, FIG. 2 is an enlarged sectional view of a main part, and FIG. 3 is a front view of a retaining ring.

In FIG. 1 and FIG. 2, a joint main body 1 of a pipe joint for a gas meter is formed in an elbow shape, a cap nut 3 is mounted on an outer surface on one end 1a side through a retaining ring 2, and a joint nut 1 is mounted on the other end 1b side. Is connected to a bend pipe (not shown), and a gas pipe is connected to the bend pipe. A groove 4 having a rectangular cross section is formed on the outer periphery of one end of the joint body 1 on the side where the cap nut is mounted,
The retaining ring 2 is fitted into the concave groove 4. As shown in FIG. 3, the retaining ring 2 is formed in a wedge-shaped cross-section having elasticity capable of expanding and contracting and deforming, with a part of the circumference thereof being cut away. As shown in FIG. 2, the outer peripheral surface 5 of the retaining ring 2
It is formed in a tapered surface having a gradually increasing diameter from one end (the lower end in the state shown in FIG. 2) to the other end (the upper end in the state shown in FIG. 2) in the center axis direction.
Is set to be substantially the same as the outer diameter b at one end on the side where the cap nut is mounted, and the maximum outer diameter c at the other end is set to be larger than the outer diameter b. The inner diameter d of the retaining ring 2 is set smaller than the outer diameter b and larger than the diameter e of the concave groove 4.

The cap nut 3 has a flange 6 protruding from the inner periphery at one end in the center axis direction (the upper end in the state shown in FIG. 2). Are set slightly larger than the outer diameter b at one end and the minimum outer diameter a of the retaining ring 2, and smaller than the maximum outer diameter c of the retaining ring 2.

Next, an assembling procedure for mounting the cap nut 3 on the outer surface of one end of the joint body 1 will be described. In FIG. 2, first, the retaining ring 2 is expanded to have a maximum outer diameter c.
The fitting body 1 is inserted upward from the lower side of the one end 1 a of the joint body 1 with the side facing upward, and fitted into the concave groove 4. Then, the retaining ring 2 projects the upper end on the maximum outer diameter c side outward from the outer surface of the joint body 1 to form a step, and the ring 2
Between the inner peripheral surface of the joint ring 1 and the groove 4 so as to form a gap s equal to or greater than the amount of protrusion of the upper end of the retaining ring 2 from the outer surface of the joint body 1. According to this mounting state, when the retaining ring 2 is reduced in diameter by the space s, the groove is formed until the upper end of the retaining ring 2 is flush with the outer surface of the joint body 1 or less. 4 can be sunk.

Next, the cap nut 3 is inserted upwardly (in the direction of arrow A) from below the one end 1a of the joint body 1 with one end of the side having the flange 6 facing upward, and a ring for preventing the inner periphery of the flange 6 from slipping off. The ring 2 is pushed upward while sliding on the outer peripheral surface 5 to reduce the diameter of the ring 2 so that the flange 6 is prevented from falling off.
As soon as it passes above the upper end of the outer peripheral surface 5, the retaining ring 2 returns to the original state in which the upper end of the outer peripheral surface 5 protrudes outward from the outer surface of the joint body 1 by the elastic restoring action. With this, the cap nut 3 is attached in a retaining state in which the flange 6 is hooked on the upper end of the retaining ring 2.

As described above, it is possible to adopt a rational assembling procedure in which the cap nut 3 is successively pushed in after the retaining ring 2 is fitted, so that the H dimension at the one end 1a side of the joint main body 1 (see FIG. 1). Can be made as short as possible than that of the conventional pipe joint described above.

[0013]

According to the present invention, a cap nut can be easily assembled on the outer surface of one end of the joint body in a retaining shape via a retaining ring.
This is advantageous because the dimensions can be reduced as much as possible, and the fitting can be reduced in size and size.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pipe joint for a gas meter.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is a front view of a retaining ring.

FIG. 4 is a longitudinal sectional view of a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Retaining ring 3 Cap nut 4 Concave groove 5 Outer peripheral surface of retaining ring 6 Flange

Continued on the front page (72) Inventor Masazo Fujisawa 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Inside Osaka Gas Co., Ltd. (72) Inventor Kazunari Nishimura 153-1, Tajiyonemachi, Kishiwada-shi, Osaka Nippon Kokan In Japan Co., Ltd. (72) Inventor Taketoshi Higashino 153-1, Tajiyone-cho, Kishiwada-shi, Osaka Nippon Steel Pipe Co., Ltd. (56) References JP-A-59-194681 (JP, U) JP-B-38-11470 (JP, B1) (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16L 19/00-19/14 F16L 21/08

Claims (1)

(57) [Claims] 1. An elbow-shaped joint body having a concave groove formed on the outer periphery of one end side, and fitted in the concave groove of the joint body, and the outer peripheral surface extends from one end facing the other end of the joint body to the other end. gradually formed into a tapered surface of the large diameter, the minimum outer diameter of one end is formed in substantially the same diameter as the outer diameter of said one end of the joint body, the outer maximum outer diameter of said one end of the joint body of the other end It is formed larger than the diameter, and the inner diameter is smaller than the outer diameter of the one end side of the joint main body and is larger than the diameter of the concave groove, and a part of the circumference is cut away, and it is expandable and contractible. A retaining ring having a wedge-shaped cross section having elasticity; and after the retaining ring is fitted into the concave groove of the joint body, the retaining ring is shrunk with respect to the outer surface of the one end side having the concave groove of the joint body. It mounted push through the diameter change type, the one end of the inner diameter joint body Outer diameter and said retaining ring minimum outside and cap nut projecting from the flange formed on the small-diameter inward than the maximum outer diameter of the retaining ring with a larger diameter than the diameter, the pipe joint made of of.