JP3012588B2 - Flexible pipe connection fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water pipe, an air conditioning pipe, etc., which are used by connecting a flexible pipe such as a polyethylene pipe.
When the connection pipe inserted into the pipe insertion portion is fastened to the pipe insertion core cylinder via the fastening ring with the cap nut, the connection pipe slides on the outer surface of the pipe insertion core pipe and turns together with the rotation of the cap nut. The present invention relates to a flexible pipe connection joint which can prevent the connection pipe from being closed and can securely tighten the connection pipe to the core tube.

[0002]

2. Description of the Related Art Conventionally, as a connection joint for a flexible pipe, as shown in FIGS.
And a connecting pipe is inserted into a gap formed between the body and the male external thread portion 3 surrounding the connecting pipe, and the inserted connecting pipe is fastened to the pipe insertion core cylinder via a fastening ring 7 with a cap nut 6. Have been used.

[0003] The connection pipe A is tightened with respect to the pipe insertion core cylinder by tightening the cap nut with a male external threaded portion surrounding the core cylinder and pushing it toward the base side.
The inner diameter of 63 is determined by narrowing the outer tapered surface 72 of the tightening ring interposed between the inner wall of the body male screw portion and the core cylinder.

[0004]

With respect to the tightening of the connecting pipe, measures are taken to prevent the connecting pipe from coming off and to prevent water from stopping, such as forming irregularities on the inner wall of the tightening ring and the outer surface of the core tube. Is the female tapered surface of the inner diameter of the cap nut drawing part
62 and the male tapered surface 72 on the outer surface of the tightening ring are formed with the same inclination, and are slid by surface joining.

Therefore, when the connecting pipe is fastened to the pipe insertion core tube, friction occurs in the tapered contact surface portion so that the tapered surface does not slide, and the connection tube slides on the outer surface of the tube insertion core tube with the rotation of the cap nut. This causes a situation in which they are rotated together, which hinders the work of tightening the connection pipe.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problem, and has an inner surface shape of a cap nut squeezed portion which squeezes an outer surface of a tightening ring, and has a curved tapered shape bulging to an inner diameter. Sliding was performed with reduced friction between the tapered surface of the constricted portion inner diameter and the tapered surface of the outer surface of the tightening ring, so that the force in the pushing direction and the tightening force on the pipe suddenly increased due to the inclination of the curved surface.

That is, the tapered surface 62 of the inner diameter of the cap nut rear end narrowed portion 63 is narrowed down by three-dimensionally contacting the outer tapered surface 72 of the tightening ring corresponding thereto.
By squeezing two-dimensionally in line contact with the bulging curved surface, the torque acting in the pushing direction becomes larger than the torque acting in the rotating direction, so that co-rotation can be prevented.

Further, an elastic bushing body having a surface which is more slippery than the outer surface of the tightening ring is interposed between the inner diameter of the narrowing portion and the outer surface of the tightening ring, so that the rotational friction is further suppressed and the smooth sliding of the narrower ring is performed. I was to be.

[0009] Further, the co-rotation of the connecting pipe is completely prevented by applying a smooth surface processing to one or both of the bulging tapered surface of the inner diameter of the constricted portion, the outer tapered surface of the tightening ring, and the contact surface of the interposed body. Was made possible.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a body part constituting a main body, and a tube insertion part for inserting a connection pipe at one end of the body part 1 as a gap formed between a tube insertion core tube 2 and a body male screw part 3 surrounding the tube insertion core tube 2. 4 is formed, and the other end is formed with a threaded joint portion 8 to which a metal tube or the like is joined by screwing.

Reference numeral 6 denotes a cap nut. The rear end narrowing portion 63 is formed as a curved tapered surface 62 bulging from the female screw engraving portion 61 to the inside diameter. It is designed to screw in the direction.

Reference numeral 7 denotes a tightening ring, which is made of a suitable elastic material such as polyacetal resin, for example, and has slits 73 for reducing the diameter alternately from both sides. The bulging tapered curved surface 62 of the cap nut squeezing portion 63 is reduced in diameter by slidingly pressing the outer tapered surface 72 of the tightening ring 7 to reduce the diameter, and the unevenness 71 formed on the inner wall surface of the tightening ring 7 is connected to the connecting pipe. A is cut into the outer surface of A, and the connection pipe A is fastened to the core tube 2.

FIGS. 4, 5 and 6 show another embodiment, in which the tapered surface 62 of the inner diameter of the constricted portion and the outer surface 72 of the tightening ring are shown.
An elastic bushing body 5 having a surface that is more slippery than the outer surface of the tightening ring is interposed between them, so that sliding friction in the rotating direction with respect to the outer tapered surface 72 of the tightening ring is indirect, This ensures the torque of the motor.

In the case of the above embodiment, the elastic bush body 5
NW-0 with the same polyacetal resin as the fastening ring 7
2 (PolyPlastic Co., trade name), LA-541 (Asahi Kasei Co., Ltd.), etc., made of a flexible material having a smoother surface than the tightening ring 7 and provided with a flange 51 at the end and a bag. The nut 6 is attached to the inner diameter of the throttle part.

Further, if one or both of the bulging tapered curved surface of the inner diameter of the constricted portion, the outer surface of the tightening ring, and the contact surface of the interposition body are subjected to smooth surface processing, the rotational torque with respect to the connecting pipe A is completely cut off. More effective.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is an overall longitudinal sectional side view showing an exploded relationship between a body main body, a tightening ring, and a cap nut.

FIG. 2 is a longitudinal sectional side view of a main part in a state where the flexible connection pipe is similarly inserted into a pipe joint and not tightened by a cap nut.

FIG. 3 is a longitudinal sectional side view of a main part of the flexible connection pipe in a state where the flexible connection pipe is similarly tightened by a cap nut.

FIG. 4 shows an embodiment in which the elastic bushing body of the present invention is interposed, and is an overall longitudinal sectional side view showing the relationship between the body main body, the tightening ring, the elastic bushing body, and the cap nut in an exploded manner.

FIG. 5 is a longitudinal sectional side view of a main part in a state in which the flexible connection pipe is inserted into the pipe joint and not tightened by the cap nut in the embodiment of FIG. 4;

FIG. 6 is a longitudinal sectional side view of a main part of the flexible connection pipe in a state where the flexible connection pipe is similarly tightened by a cap nut.

FIG. 7 is an overall longitudinal sectional side view of a conventional flexible pipe connecting joint in a state in which a flexible connecting pipe is inserted into a pipe joint and not tightened by a cap nut.

FIG. 8 is a side view of the entire longitudinal section of the conventional flexible pipe connection joint in a state where the flexible connection pipe is inserted into the pipe joint and tightened by the cap nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body part of joint body 2 Pipe insertion core cylinder 3 Body male screw part 4 Pipe insertion part 5 Elastic bushing body 51 Flange part of elastic bushing body 6 Cap nut 61 Female screw engraving part 62 Tapered surface of constriction part inner diameter 63 Cap nut Aperture 7 Tightening ring 71 Irregularities formed on inner wall surface of tightening ring 72 Tapered surface of outer surface of tightening ring 73 Cut-off portion 8 Screw joint A Flexible connection pipe

Claims (3)

(57) [Claims] 1. A flexible pipe connection joint in which a connecting pipe inserted into a pipe insertion portion of a body is fastened to a pipe insertion core tube via a fastening ring by a fastening nut, and a taper of an inner diameter surface of a narrowed portion at a rear end of the fastening nut is provided. A flexible pipe connection joint characterized in that the shape is formed into a curved tapered shape that swells to the inner diameter, and the curved surface of the end abuts against the tapered surface of the outer surface of the tightening ring to narrow the outer surface of the tightening ring. 2. The method according to claim 1, further comprising:
2. The flexible pipe connecting joint according to claim 1, wherein an elastic bushing body having a surface that is more slippery than the outer surface of the tightening ring is interposed. 3. The flexible pipe joint according to claim 1, wherein one or both of the tapered curved surface of the inner diameter of the constricted portion, the outer surface of the tightening ring, and the contact surface of the interposition body are subjected to smooth surface processing.