JPH0678793B2 - Pipe fitting - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pipe joint capable of connecting a connecting pipe easily and quickly by a simple operation.

(Prior Art) For example, in gas piping work, it is common for an operator to enter a hole excavated in the ground and connect a connecting pipe such as a polyethylene pipe or a steel pipe with a pipe joint. It costs a lot for civil engineering such as excavation, and in recent years, it may be difficult to open and cut to cross a road due to traffic conditions.

Therefore, as shown in FIG. 10, the horizontal hole 5 is penetrated from the wide vertical shaft 2 excavated in the burying place of the main pipe 1 to the small vertical shaft 4 excavated in the vicinity of the private house 3, and then the pipe is preliminarily piped. The vertical pipe 8 with the joint 7 attached is inserted into the narrow shaft 4, and the end of the flexible connecting pipe 6 such as a polyethylene pipe drawn from the shaft 2 through the horizontal hole 5 is inserted into the pipe joint 7 to form a handle. In recent years, a method of operating a long pipe wrench 9 from the ground to tighten the push ring of the pipe joint 7 to perform piping without significantly cutting the road has been adopted.

(Problems to be solved by the invention) However, according to the above-mentioned construction method, for example, a pipe wrench 9 with a long handle of about 1.5 m is operated on the ground and tightened at a depth of about 1.2 m. Not only did the tightening stroke become smaller, but the tightening work required considerable time and trouble. Further, since the push ring is rotated and tightened, there is a problem that a flexible connecting pipe such as a polyethylene pipe is considerably twisted.

(Object of the invention) The present invention has been made in view of such conventional problems, and makes it possible to connect the connecting pipe to the joint body instantly by sliding the push ring, so that the joining work is extremely easy and quick. An object of the present invention is to provide a pipe joint which can be used for

(Means for Solving the Problems) In order to achieve the above-mentioned object, the pipe joint of the present invention includes a joint main body into which a connection pipe is inserted, and an external fitting to the opening of the joint main body when the connection pipe is inserted. A push ring, a meshing mechanism interposed between the joint body and the push wheel, and a gasket arranged between the inner peripheral surface of the joint body at a deeper portion than the intervening portion of the meshing mechanism and the push ring. The engagement mechanism includes a retaining claw-shaped male screw provided on the joint body side and a female screw provided on the push ring side and capable of being screwed with the male screw in a ratchet state, and either one of the male screw or the female screw is provided. However, it is configured such that it can be expanded and contracted, and is constantly elastically biased in a direction in which it meshes with the other, and the joint body gradually increases in diameter toward the opening end side on the inner peripheral surface. The first taper surface is formed And are characterized.

(Operation) In the pipe joint of the present invention, when the connecting pipe is inserted into the push ring and inserted into the joint body, and then the push ring is pushed into the joint body, the gasket is pressed against the first tapered surface of the joint body by the push ring. A seal is provided between the joint body and the connecting pipe. Further, when the push wheel is pushed in, the female screw provided on the push wheel side goes over the male screw provided on the joint body side and goes straight, and these two screws are screwed together in a ratchet state.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

FIG. 1 is a partial cross-sectional view showing a state in which a connecting pipe is connected to the pipe joint of the embodiment, and FIG. 2 is a main-portion cross-sectional view showing a state before connection.

In these figures, a peripheral groove 11 is provided at the tip of an elbow type joint body 10, and a connecting piece 18 having a male thread 12 having a thread shape of a stop claw is provided in the peripheral groove 11 via an elastic member 19. Is held. A first tapered surface 13 having a diameter gradually increasing toward the tip side is formed on the inner peripheral surface of the end of the joint body 10.

The connection piece 18 is composed of a plurality of split rings of two or three. And each connecting piece 18 is the joint body 10
It is movably in the radial direction and immovable in the circumferential direction due to the concave and convex engagement with and is always biased outward by an elastic member 19 made of rubber or a coil spring (not shown).

On the other hand, on the inner peripheral surface of the push ring 14, the male screw 12 of the joint body 10 is
And a female screw 17 that is screwed in a ratchet state. Further, a second taper surface 15 having a diameter gradually increasing toward the opening end side is formed on the inner peripheral surface of the push ring 14 at a portion deeper than the female screw 17. Further, between the first tapered surface 13 and the second tapered surface 15, the gasket 20 and the retainer are provided.
21 and an annular retaining ring 23 having retaining teeth 22 formed on the inner peripheral surface thereof are arranged in order from the first tapered surface 13. The outer surfaces of the joint body 10 and the push ring 14 are covered with resin lining layers 24 and 25, respectively.
The circumferential groove formed on the outer peripheral surface of the tip of the lining layer 24 of
A ring 27 is fitted and a T-shaped rubber ring 29 is fitted in an annular recess 28 formed on the inner peripheral surface of the other end of the push ring 14. Further, a plurality of stoppers 30 are provided at appropriate positions on the inner circumference of the joint body 10, while a stiffener 31 for reinforcement is fitted to the end of the connecting pipe 6.

The connecting piece 18 may be in the shape of a truncated ring. In that case, as shown in FIG. 7 or 8, the pin 59 or the screw 61 is inserted from the outside into the through hole 58 formed in the push ring 14. The connecting piece 18 may be radially expandable / contractible with respect to the push ring 14 and may not be circumferentially movable by interposing the connecting piece 18 in the cutout portion 57 of the connecting piece 18. By doing so, the elasticity of the material itself of the connecting piece 18 urges the female screw 17 in the direction in which it engages with the male screw on the other side. In addition, in FIGS. 7 and 8, an example in which the connecting piece 18 is provided with the female screw 17 has been described. However, in the case of holding the ring-shaped connecting piece on the joint body side, the connecting piece has a male screw. Must be provided. Further, the connecting piece 18 is, as illustrated in FIG.
A plurality of arc-shaped members 63 may be connected by a plurality of springs 62.

Next, the operation will be described.

As shown in FIG. 2, the male thread 12 of the connecting piece 18 and the female thread 17 of the push ring 14 are screwed together by about two ridges, and the connecting pipe 6 is inserted into the push ring 14 and the joint body 10 as shown by the arrow. The tip is brought into contact with the stopper 30 as described above. Next, when the push ring 14 is pushed into the joint body 10 as shown by the arrow in FIG. 1, the female screw 17 of the push ring 14 goes over the male screw 12 of the connecting piece 18 and goes straight. As a result, the gasket 20 pushed by the push wheel 14 via the retainer 21 comes into contact with the first tapered surface 13 and is compressed, and is brought into pressure contact with the outer peripheral surface of the connecting pipe 6. Also, retainer 21
The retaining ring 23, the movement of which is prevented by the second taper surface 15, is pressed against the outer surface of the connecting pipe 6, and the retaining teeth 22 of the retaining ring 22 are pushed into the connecting pipe 6. On the other hand, the male screw 12 is engaged with the female screw 17 in a ratchet state by the urging force of the elastic member 19, so that the push ring 14 does not return in the opposite movement direction.

In short, when connecting the connecting pipe 6 to the pipe joint,
After inserting the connecting pipe 6 into the push ring 14 and the fitting body 10,
Simply push in the fitting body 10 to complete the connection.

When it is desired to remove the connecting pipe 6, the push ring 14 is rotated. As a result, the connecting piece 18 rotates integrally with the push ring 14, the male screw 12 thereof is screwed out from the female screw 17 of the push ring 14, and the retaining ring 23 loosens accordingly. Therefore, the connecting pipe 6 can be easily pulled out from the pipe joint.

Next, an example of a device for pushing the push ring 14 into the joint body 10 will be described with reference to FIGS. This pushing device includes a holding member 33 having a double door opening structure by a rotating portion 34 formed of a hinge or a hinge, a fastening pin 35, and a holding member.
It is composed of hydraulic cylinders 37, 37 attached to 33 and a retaining ring 40 attached to a piston rod 38 of the hydraulic cylinder 37. In order to perform the connection work described above with this pushing device, the holding pin 33 is fixed to the joint body 10 by inserting the fastening pin 30 into the holding member 33 holding the joint body 10 and the latch ring. 40 is wound around the other end of the push ring 14 and fixed by the retaining pin 41. After that, when the hydraulic cylinder 37 is driven by an operation on the ground, the retaining ring 40 is moved by the piston rod 38.
Is pushed in, and the push ring 14 is pushed into the joint body 10. After the work is completed, pull up the drawstring (not shown)
And the retaining pin 41 is pulled out, and the holding member 33 is opened by the two operating rods 43, 43 provided upright on the holding member 34 to release the fixing to the joint body 10 and the latch ring 40 is opened. , Release the fixation with the push ring 14 and pull them up to the ground.

In the embodiment described above, the female screw 17 provided on the side of the push ring 14, the male screw 12 of the connecting piece 18, and the elastic member 19 that constantly biases the male screw 12 in the direction in which the male screw 12 meshes with the female screw 17. Cooperate with each other to form a meshing mechanism that is an example of a component of the present invention. In this meshing mechanism, the male screw 12 is provided on the joint body 10 side from where the connecting piece 18 is held in the holding groove 16 of the joint body 10.

FIG. 9 illustrates a usage state of a pipe joint including a meshing mechanism according to a modification. In the figure, a peripheral groove 60 is provided on the inner peripheral surface of the end opening portion of the push ring 14 having a large diameter, and a connection piece 50 is formed by screwing a female screw 17 having a thread shape of a stop claw. Is fitted in the circumferential groove 60 via the elastic member 19.
In addition, a first tapered surface 13 having a diameter gradually increasing toward the opening end is formed on the inner peripheral surface of the inner part of the joint body 10.

The connecting piece 50 is composed of a plurality of split rings of 2 or 3 and is an inner nut screwed to the push ring 14.
It is held by 53 so as not to fall from the circumferential groove 60, and is movable in the radial direction and immovable in the circumferential direction.

The elastic member 19 is made of an annular coil spring or an annular rubber (not shown), and has an engaging groove 50a on the outer periphery of the connection piece 50.
The connection piece 50 is always urged inward. On the other hand, a male screw 12 that can be screwed into the female screw 17 of the connecting piece 50 in a ratchet state is screwed on the outer peripheral surface of the joint body 10 on the one open end side. Since other configurations are the same as those in FIG. 1, the same or corresponding portions will be denoted by the same reference numerals and description thereof will be omitted.

According to the pipe joint of FIG. 9, the connecting pipe 6 is inserted through the other end opening of the push ring 14 as shown by the arrow in the same figure, and the tip is a stopper.
When the push ring 14 is pushed into the joint body 10 until it comes into contact with the 30, the gasket 20 moves along the straight line of the push ring 14 and the retainer 21
Is pressed by and is pressed against the first tapered surface 13. Further, the retaining ring 23 is brought into sliding contact with the second tapered surface 15 to be reduced in diameter, and the retaining teeth 22 bite into the outer surface of the connecting pipe 6 to prevent the connecting pipe 6 from coming off. Further, since the connecting piece 50 is biased inward by the elastic member 19, both screws 12, 17 are screwed together in the ratchet state. Therefore, the connecting pipe 6 is fixed to the joint body 10 without coming off, and the gasket 27 reliably seals between the joint body 10 and the connecting pipe 6. In addition, in order to push the push wheel 14 into the joint body 10, the pushing device described with reference to FIGS. 3 to 5 can be similarly used.

When removing the connecting pipe 6, the push ring 14 may be rotated with respect to the joint body 10 to release the screwed state, and the push ring 14 may be separated from the joint body 10.

In this embodiment, the female screw 17 of the connecting piece 50 and the joint body are
An elastic member 19 for constantly elastically urging the male screw 12 provided on the 10 side and the female screw 17 in a direction to engage with the male screw 12.
And the meshing mechanism, which is a constituent element of the present invention, are configured in cooperation with. In this meshing mechanism, the connecting piece 50 is
The female screw 17 is provided on the side of the push ring 14 since it is held by the.

Needless to say, the present invention is not limited to the embodiment described above, and the joint body may be a socket type, a T-shape or the like, and the connecting pipes inserted into the respective openings of the joint body are all as described above. The connection may be made only by the movement of the push ring, or only some of the connection pipes may be made only by the movement of the push ring, and the connection pipe may be a steel pipe, a resin-lined steel pipe, a cast iron pipe, or the like. The construction method using the pipe joint of the present invention is not limited to the case where the pipe joint is connected to the shaft, and the pipe joint and the connection pipe are connected under the ground when the pipe joint and the connection pipe are connected on the ground. It may be used in the case of connecting with, and the point is that various modifications can be made without departing from the scope of the present invention.

(Effects of the Invention) According to the pipe joint of the present invention as described in detail above, since the pipe joint and the connection pipe can be connected by pushing and moving the push ring after inserting the connection pipe, the connection pipe can be extremely quickly performed. Moreover, since the connection can be easily performed and the push ring is simply moved linearly, the connection pipe is not twisted. Further, the present invention can be applied to a case where a pipe to be buried underground such as a gas pipe is connected by an operation on the ground or to a flexible pipe such as a polyethylene pipe to obtain a remarkable effect. Is.

[Brief description of drawings]

1 and 2 show the usage of the pipe joint according to an embodiment of the present invention, FIG. 1 is a longitudinal sectional view showing a state after connection, and FIG. 2 is a longitudinal sectional view of an essential part showing a state before connection. Fig. 3 is a plan view showing a state in which a pushing device for a push wheel is attached to a pipe joint, Fig. 4 is a side view of the same, Fig. 5 is a front view showing a part of the device, and Fig. 6 is a connecting piece. A front view showing a modified example, FIGS. 7 and 8 are partial sectional views showing a main part of a pipe joint using another modified example of the connecting piece, and FIG. 9 is a use state of the pipe joint according to another embodiment. FIG. 10 is a partial cross-sectional view showing a conventional piping method for gas piping. 6 ... Connection pipe, 10 ... Joint body, 12 ... Male screw, 13 ... First taper surface, 14 ... Push ring, 17 ... Female screw, 19 ... Elastic member, 20 ... Gasket.

Continued Front Page (72) Hideo Hirabayashi Inventor Hideo Hirabayashi 2-12-7 Shimoshinjo, Higashiyodogawa-ku, Osaka-shi, Osaka

Claims (1)

[Claims] 1. A joint body into which a connection pipe is inserted, a push ring into which the connection pipe is inserted and which is externally fitted in an opening of the joint body, and a meshing mechanism interposed between the joint body and the push ring. , A gasket provided between the inner peripheral surface of the joint body deeper than the intervening portion of the meshing mechanism and the push ring, and the meshing mechanism includes a male claw-shaped male screw provided on the joint body side and a push ring. And a female screw that can be screwed in a ratchet state with the male screw, and either the male screw or the female screw is configured to be expandable / reducible and is always elastically pressed in the direction of meshing with the other. The pipe joint according to claim 1, wherein the joint main body is formed with a first tapered surface having a diameter gradually increasing toward the opening end side of the inner peripheral surface of the joint main body.