JP2003049984A - Joint for soft pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint for a soft pipe integrating a chuck ring with a cap nut and providing visual confirmation of completion of fastening. SOLUTION: The joint for the soft pipe comprises a joint body, the cap nut and the chuck ring. In the joint body, a connecting part to existing piping is provided in one side, an inner cylinder and an outer cylinder having a gap capable of receiving a pipe end of the soft pipe are concentrically provided in another side axial direction, an anti-loosening groove is circumferentially provided in an outer circumferential face of the inner cylinder, and a male screw part is threaded in an outer circumferential face of the outer cylinder. In the cap nut, a female screw part is provided in one inner side, a tapered face having a constant downward gradient is provided in an inner circumference, and a stage part is provided in a trailing end. In the chuck ring, an outer circumferential face is used as a tapered face matching with the tapered face of the cap nut, a collar engaging with the stage part is circumferentially provided on a tip, and the cap nut and the chuck ring are integrally composed. A means of providing a tooth space in an inner circumferential face and passing an expanding slot through one place is adopted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal joint for connecting a soft pipe such as a polyethylene pipe, and in particular, a chuck ring is fitted on a cap nut side for tightening to form an integral type. The chuck ring is exposed from the rear end side of the cap nut so that the completion of tightening can be visually confirmed.

[0002]

2. Description of the Related Art Conventionally, as a soft pipe joint of this type, as shown in FIG. 3 (A), a pipe end of a soft pipe (b) to be inserted into a hollow joint body (a) is used. Side, a core or a tapered core (c) for preventing the diameter reduction of the tube end is inserted in advance, and the chuck ring (d) previously inserted in the soft tube (b) side is fitted with a cap nut (e) by a cap nut (e). It is widely known that the tube end portion of the soft tube is clamped between the core (c) and the chuck ring (d) by strongly tightening the same.

However, in these general soft pipe joints, the necessary members such as the core (c) and the chuck ring (d) are formed separately from the joint body (a) and the cap nut (e). There was a risk that these components would be lost or misplaced at the site.

Further, since confirmation of the completion of tightening is based on torque management, it is necessary to use a torque wrench, and a considerable skill of skilled workers is required.

On the other hand, for example, as disclosed in Japanese Patent Application Laid-Open No. 10-311476 filed by the present applicant (see FIG. 3 (B)), the tube end of the soft tube (b) can be inserted in the axial direction. Of the joint body (a), which is formed by concentrically projecting an inner cylinder (e) and an outer cylinder (g) having a large gap, has a retaining groove on the outer periphery in the latter half of the inner cylinder (f), and the outer cylinder. While a male screw part that can be fitted with a cap nut (e) is provided on the outer peripheral surface of, while a tapered surface with a certain downward slope is provided on the inner periphery from the mouth end,
A recessed groove is provided around the inner depth of the cap nut (e), and a large number of tooth grooves are separately provided on the inner surface inside the recessed groove, and the surface is aligned with the tapered surface of the outer cylinder. With a tapered surface,
There is also known a core-integrated joint in which a proximal end flange of a chuck ring (d) that can be expanded and contracted in the axial direction is recessed and integrally formed.

[0006]

In the case of the core-integrated joint having such a structure, there is no risk of losing the core or the chuck ring, but when the tube is inserted into the cap nut, the chuck ring does not fall out of the groove. There was a problem that the tube could not be inserted smoothly when it occurred. Further, it has been pointed out that the chuck ring has a structure in which the diameter thereof is reduced when a force is applied in the drawing direction of the tube, so that the chuck ring is weak in the drawing direction.

In view of the above problems, the present invention has an object of proposing a soft pipe joint in which a chuck ring is integrally formed with a cap nut and the completion of tightening can be visually confirmed. is there

[0008]

In order to solve the above problems, the present invention provides a flexible pipe joint comprising a joint body, a cap nut and a chuck ring, wherein a hollow joint body is provided on one side to connect to an existing pipe. And an inner cylinder and an outer cylinder having a gap into which the pipe end of the soft pipe can be inserted in the axial direction of the other side are concentrically provided, and a retaining groove is provided around the outer peripheral surface of the inner cylinder and the outer periphery of the outer cylinder. While the male screw part with which the cap nut is screwed is cut on the surface, the cap nut is provided with a female screw part that is screwed with the male screw part on the inner side of one side, and a certain downward descent to the opening on the other side on the inner circumference. A tapered surface having a slope is provided and a step portion is formed at the end thereof, and the chuck ring has an outer peripheral surface which is a tapered taper surface that matches the taper surface of the cap nut, and the tip of the chuck ring is a protrusion that engages with the step portion. Around the tsuba, the cap nut and chuck ring are integrated Both the tooth grooves and circumferentially on the inner peripheral surface,
We adopted the method of passing a split groove in one place.

Further, a means for providing a wrench collar at the substantially central portion of the joint body is also adopted.

In the soft pipe joint having the above construction, the soft pipe is inserted from the rear end side of the cap nut and mounted in the gap between the inner cylinder and the outer cylinder of the joint body, and the cap nut is screwed forward to the joint body. Then, the taper surface of the chuck ring slides on the taper surface of the inner circumference of the cap nut, and the diameter of the chuck ring decreases due to the relationship between the two, and the tooth ring on the inner circumference of the chuck ring and the retaining groove on the inner cylinder are soft. It is possible to reliably prevent the soft tube from coming out by sandwiching the tube.

Further, as the cap nut advances, the protruding flange at the rear end of the chuck ring is gradually exposed from the rear end step of the cap nut, so that the tightening completion can be visually confirmed. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the structure of a flexible pipe joint according to the present invention will be described below with reference to the drawings.
First, as shown in FIG. 1, the joint for a soft pipe of the present invention is roughly classified into three parts: a joint body 1, a cap nut 2, and a chuck ring 3.
It consists of members, of which cap nut 2 and chuck ring 3
The feature of the present invention lies in the fact that the flexible pipe (P) is connected to the joint body 1 through the chuck ring 2 by the rotation of the cap nut 3 when connecting the soft pipe (P). It is similar to the joint.

That is, the hollow joint main body 1 is usually formed of non-rust metal such as gun metal, and a wrench collar 1a is provided around the center thereof, and a connecting portion to an existing pipe is provided on one side thereof. 1b is provided. On the other side of the wrench collar 1a, an inner cylinder 1c and an outer cylinder 1d that extend in the axial direction are concentrically projected, and a pipe end of a soft pipe (P) is provided between the inner cylinder 1c and the outer cylinder 1d. A gap 1e that can be inserted is provided, one or a plurality of retaining grooves 1f are provided on the outer peripheral surface of the inner cylinder 1c, and a male nut that engages with a cap nut 2 described later is further provided on the outer peripheral surface of the outer cylinder 1d. The screw part 1g is cut.

Next, the cap nut 2 is made of the same metal material as that of the joint body 1 and has a female screw portion 2a which is screwed into the male screw portion 1g of the outer cylinder 1d on one side inner periphery and further has an inner periphery. A tapered surface 2b having a certain downward slope is provided on the other side opening portion, and a short step portion 2c is formed at the end thereof.

Further, the chuck ring 3 is made of a hard synthetic resin or the like having a certain elasticity, and its outer peripheral surface is a tapered taper surface 3a which is aligned with the inner peripheral taper surface 2b of the cap nut 2 and is provided at the end thereof. A projecting flange 3b that engages with the stepped portion 2c of the cap nut 2 is provided around the cap nut 2 so as to be fitted to the cap nut 2 and integrated with each other, and to prevent the cap nut 2 from falling off. On the other hand, on the inner surface of the chuck ring 3, a tooth groove 3c having a sawtooth-shaped cross section is provided, and the chuck ring 3 is formed.
A split groove 3d having a constant width is provided at one position so that the entire chuck ring 3 can be elastically expanded and contracted.

In the soft pipe joint of the present invention having the above-mentioned structure, the connecting portion 1b on one side of the joint body 1 is connected to the existing pipe, while the soft pipe (P) is a cap nut in which the chuck ring 3 is previously integrated. 2 is inserted from the rear end side, and the pipe end is attached to the gap 1e between the inner cylinder 1c and the outer cylinder 1d of the joint body 1. At this time, since the chuck ring 3 has the maximum diameter, the soft tube can be easily inserted. Next, the female screw portion 2a of the cap nut 2 is screwed into the male screw portion 1g of the joint body 1, and the cap nut 2 is rotated in the forward direction via a pipe wrench (not shown) or the like. As the cap nut 2 advances, the taper surface 3a of the chuck ring 3 slides on the taper surface 2b of the inner circumference of the cap nut 2 and gradually divides in accordance with the relationship between them.
To reduce the diameter (see FIGS. 2A to 2C). Therefore, the tooth groove 3c on the inner circumference of the chuck ring 3 bites into the tube end surface and the retaining groove 1f of the inner cylinder 1c bites into the tube end inner surface, respectively, so that the soft tube is reliably prevented from coming out. it can. Further, even if the soft tube is pulled in the pulling-out direction, the chuck ring 3 always acts to reduce the diameter due to the relationship of the tapered surfaces 2b and 3a, so that the soft tube does not come out easily.

At this time, since the chuck ring 3 is in contact with the front surface of the outer cylinder 1d and is prevented from advancing, only the diameter is reduced without moving at that position, but the cap nut 2 continues to advance, The projecting collar 3b at the rear end of the chuck ring 3 is gradually exposed from the rear end step 2c of the cap nut 2 (see FIG. 2 (C)), so that the tightening can be completed without using a tool such as a torque wrench. It is possible to confirm it visually.

[0018]

As described above, in the flexible pipe joint according to the present invention, since the chuck ring is integrated with the cap nut, it is possible to surely avoid the loss of the member or the mounting error in the field. It became possible to do. Also,
Since the chuck ring is expanded when the pipe end is inserted, it is extremely easy to insert the pipe end, and the construction is less likely to cause mistakes during construction.

Further, since the rear end of the chuck ring is exposed from the rear end of the cap nut according to the tightening of the cap nut, it is possible to visually confirm the completion of tightening, and a special tool such as a torque wrench is required. It can be easily installed by anyone without doing so. Therefore, there is an advantage that it is unlikely that a difference occurs depending on the builder during the construction.

[Brief description of drawings]

FIG. 1 is a partially cutaway exploded view showing an embodiment of a soft pipe joint according to the present invention.

FIG. 2 is an explanatory diagram of a tightened state of a chuck ring.

FIG. 3A and FIG. 3B both show examples of conventional soft pipe joints.

[Explanation of symbols]

1 Joint body 1c inner cylinder 1d outer cylinder 1e gap 1f retaining groove 1g male thread 2 bag nuts 2a Female thread 2b Tapered surface 2c step 3 chuck ring 3a Tapered surface 3b Tsuba 3c tooth space 3d split groove

Claims (2)

[Claims] 1. A hollow joint main body is provided with a connection part to an existing pipe on one side, and is provided concentrically with an inner cylinder and an outer cylinder having a gap into which a pipe end of a soft pipe can be inserted in the axial direction of the other side. , A retaining groove is provided on the outer peripheral surface of the inner cylinder, and a male screw portion with which the cap nut is screwed is cut on the outer peripheral surface of the outer cylinder, while the cap nut is screwed with the male screw portion on one inner side. In addition to providing a female screw part to be fitted, a taper surface having a certain downward slope is provided on the inner circumference to the other side opening and a step is formed at the end thereof, and the chuck ring has an outer peripheral surface as the taper surface of the cap nut. A tapered taper surface to be aligned is provided, and at the tip thereof, a projecting flange that engages with the above step portion is provided around the cap nut and the chuck ring integrally, and at the same time, a tooth groove is provided around the inner peripheral surface. A soft pipe joint characterized in that split grooves are provided in several places. 2. The joint for a soft pipe according to claim 1, wherein the joint body has a wrench collar at a substantially central portion thereof.