JPH0754158B2 - 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 the above-mentioned circumstances, and a predetermined connecting work can be performed very easily and quickly by a simple operation of pushing a push ring, and without twisting a connecting pipe. It is an object of the present invention to provide a pipe joint that can be disconnected and can be easily disconnected.

(Means for Solving the Problems) In order to achieve the above object, a pipe joint according to the present invention includes a joint body into which a connecting pipe is inserted, and a joint pipe into which the connecting pipe is inserted and an opening portion of the joint body. A push ring, a meshing mechanism interposed between the joint main body and the push ring, and a coupling mechanism disposed between the inner peripheral surface of the joint main body and the push ring deeper than the intervening portion of the meshing mechanism. A pipe joint provided with a gasket which is pressed by a first tapered surface formed on the inner peripheral surface so as to have a diameter gradually increasing toward the opening end side and seals between the joint body and the connection pipe. In the above, the meshing mechanism includes a saw blade-shaped female screw provided on the joint body side and a saw blade-shaped male screw provided on the push ring side and screwed to the female screw. Either of the female screw or the male screw. One of them is designed to expand and contract in the radial direction. In addition, the female screw or the male screw that can be expanded and contracted in the radial direction is always elastically biased in the direction in which it meshes with the other, and the male screw on the push ring side is pushed along with the direct pushing of the push ring in one axial direction. Is capable of moving straight ahead over the female screw on the joint body side, and the male screw on the push wheel side is screw-movable with respect to the female screw on the joint body side in the other direction of the axis along with the rotation of the push ring. It is characterized by being present.

(Operation) According to the present invention, after the connecting pipe is inserted into the push ring and inserted into the joint body, the push ring is linearly pushed toward the joint body in one axial direction. The saw-toothed male screw of (1) moves over the saw-toothed female screw of the joint body side in a straight line while repeating the diameter expansion against the elastic urging force in the meshing direction and the diameter reduction by the elastic urging force,
At this time, it is in a so-called ratchet state in which movement in the other direction in the axial direction is prevented by the engagement of the female and male screws having a saw blade shape. As a result, it is possible to easily and quickly perform a predetermined connecting operation without requiring a troublesome and troublesome operation such as a screwdriver and without applying a twisting force to the connecting pipe. Further, after the predetermined connection or during the connection, the connection state can be easily released by releasing the male screw through the push ring in the same manner as the usual screw tightening release operation.

(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. As shown in these figures, the elbow type fitting body 10
Has a large-diameter tip portion, and a saw blade-shaped female screw 12 is formed on the inner peripheral surface thereof. Is formed with a tapered surface 13. On the other hand, a second tapered surface 15 having a diameter gradually increasing toward the front end is formed on the inner peripheral surface of the front end portion of the push wheel 14, and a holding groove 16 is formed on the outer peripheral surface of the front end portion. The holding groove 16 holds a plurality of arcuate connecting pieces 18 in the circumferential direction, which has a saw blade-shaped male screw 17 formed on the outer peripheral surface thereof. The male screw 17 of each of these connecting pieces 18 is capable of moving straight ahead of the female screw 12 by overcoming the female screw 12 on the joint body 10 side along with the linear pushing of the push ring 14 in one axial direction. It is configured to be screwed into a ratchet state in which movement in the other direction is blocked by engagement, and to be screw-movable with respect to the internal thread 12 on the joint body 10 side in the other direction of the axis along with the rotation of the push ring 14. ing. The connecting piece 18 is movable in the radial direction and is not movable in the circumferential direction by the concave and convex engagement with the push wheel 14, and the holding groove
An elastic member 19 made of rubber (not shown) or a coil spring (not shown) interposed between the 16 and the connection piece 18 is constantly biased in a direction in which the female screw 12 is engaged. The connecting piece 18 may be in the shape of a truncated ring, in which case, as shown in FIG. 7 or FIG.
Is externally inserted into the through hole 58 formed in the joint body 10 or the push ring 14 and is interposed in the cutout portion 57 of the connection piece 18, so that the connection piece 18 can be radially expanded and contracted with respect to the push ring 14. It may be immovable in the circumferential direction. By doing so, the elasticity of the material itself of the connecting piece 18 urges the female screw 12 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 male screw 17 has been described. However, in the case of holding the ring-shaped connecting piece on the push ring side, the connecting piece is provided with a female screw. It is necessary to have it. Further, the connecting piece 18 may be formed by connecting a plurality of arc-shaped members 63 with a plurality of springs 62, as illustrated in FIG.

Next, between the first taper surface 13 and the second taper surface 15, a gasket 20, a retainer 21, and a serrated retaining tooth 56 on the inner peripheral surface are provided, and each of them is capable of being expanded / contracted. Stop ring
55 are arranged in order from the first tapered surface 13 side. Resin lining layers 24, 25 are formed on the outer surfaces of the joint body 10 and the push ring 14, respectively, and an O-ring 27 is fitted in the circumferential groove formed on the outer peripheral surface of the lining layer 25 of the push ring 14. At the same time, a T-shaped ring 29 is fitted in an annular recess formed on the inner peripheral surface of the other end of the push wheel 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.

Next, the operation will be described.

As shown in FIG. 2, the male screw 17 of the connecting piece 18 is screwed into the female screw 12 of the joint body 10 by about two threads, 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 male screw 17 of the connecting piece 18 moves straight while passing over the female screw 12 of the joint body 10. 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. In addition, a retaining ring whose movement is blocked by the retainer 21
When 55 is pressed against the second taper surface 15 and the retaining teeth 56 bite into the outer surface of the connecting pipe 6 and the connecting pipe 6 moves in the pulling-out direction, the retaining ring 55 that moves together with the connecting pipe 6 Is reduced in diameter by the second taper surface 15 and the retaining teeth 56 deeply bite into the connecting pipe 6 to prevent the connecting pipe 6 from coming off. On the other hand, the male screw 17 is meshed with and engaged with the female screw 12 by the urging force of the elastic member 19, and is screwed into a ratchet state in which the movement of the push ring 14 in the direction opposite to the pushing direction is prevented, and thus, The push wheel 14 is reliably prevented from returning and moving in the counter-pushing 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,
The predetermined connection is completed only by linearly pushing into the joint body 10 in one axial direction.

Further, when the connecting work is carried out as described above, it is noticed that the connecting pipe 6 is insufficiently inserted or the insertion posture is tilted after the pushing wheel 14 is pushed, and the connection is made again, or the connecting pipe 6 is made after the connection is completed. If you want to remove the
By rotating 14 to rotate the connecting piece 18, the male screw 17 is screwed with respect to the female screw 12 on the joint body 10 side, and the push ring 14 moves in the direction opposite to the pushing direction. The retaining ring 55 is loosened and the connecting pipe 6 is
And it can be easily pulled out from the push ring 14.

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 35 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, the pulling cord 36 is pulled up to pull out the fastening pin 35 and the retaining pin 41, and the holding member 33 is opened by the two operating rods 43, 43 provided upright on the holding member 33 to form the joint body 10. Release the lock ring 40, open the retaining ring 40, and
Release the fixation with and pull these to the ground.

In the embodiment described above, the female screw 12 provided on the joint body 10 side, the male screw 17 of the connecting piece 18, and the elastic member 19 that constantly biases the male screw 17 in the direction of engaging the female screw 12 And 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 17 is provided on the side of the push ring 14 since the connecting piece 18 is held in the holding groove 16 of the push wheel 14.

FIG. 9 illustrates a usage state of a pipe joint including a meshing mechanism according to a modification. In the figure, a connection is made by forming a circumferential groove 11 on the inner peripheral surface of the end opening portion of the joint body 10 expanded to a large diameter, and screwing an internal thread 12 having a thread shape of a stop claw shape. The piece 50 is fitted in the circumferential groove 11 via the elastic member 19. Further, a first tapered surface 13 having a diameter gradually increasing toward the opening end side is formed on the inner peripheral surface of the joint body 10 at a position deeper than the connection piece 50 position.

The connecting piece 50 is composed of a plurality of split rings of two or three, and a recess 52 is formed on the side surface of each split ring.
The projection piece 54 of the inner nut 53 that is screwed into the joint body 10 is fitted into the recess 52 and is held so as not to fall out from the circumferential groove 11, and is movable in the radial expansion direction. Moreover, it is not movable 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 17 that can be screwed into the female screw 12 of the connecting piece 50 in a ratchet state is screwed on the outer peripheral surface of the push wheel 14 on the one open end side. Further, a second taper surface 15 having a diameter gradually increasing toward the one end opening end side is formed on the inner circumference of the one end opening end of the push wheel 14. 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 by inserting it until it abuts the 32, 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 55 is brought into sliding contact with the second taper surface 15 to be reduced in diameter, and the retaining teeth 56 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, 1
7 is screwed 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 ring 14 into the joint body 10, the pushing device described in FIGS. 3 to 5 can be used similarly.

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. At this time, since the inner nut 53 is integrated with the joint body 10 by the resin lining layer 25, co-rotation between the joint body 10 and the inner nut 53 does not occur.

In this embodiment, by the cooperation of the female screw 12 of the connecting piece 50, the male screw 17 provided on the push ring 14 side, and the elastic member 19 that constantly biases the female screw 12 in the direction in which the male screw 17 is engaged. The meshing mechanism that is a component of the present invention is configured. In this meshing mechanism, the connecting piece 50 is
The female screw 12 is held in the fitting body.
It is equipped on the 10th side.

The present invention is, of course, not limited to those of the above-mentioned embodiment, and the joint body may be a socket type, a T-shape, etc.,
In addition, all the connection pipes inserted into each opening of the joint body may be connected only by moving the push ring as described above, or only some of the connection pipes can be connected by only moving the push ring. Further, the connection pipe may be a steel pipe, a resin-lined steel pipe, a cast iron pipe, or the like. Furthermore, the construction method using the pipe joint of the present invention is not limited to the case of performing in a shaft, but is connected to the pipe joint on the ground. It may be used when connecting a pipe or when connecting the pipe joint and the connecting pipe under the ground by excavating the ground. The point is that various modifications can be made without departing from the scope of the present invention. .

(Effect of the invention) As described above, according to the present invention, after inserting the connecting pipe, it is sufficient to perform a simple operation such as linearly pushing the push ring toward the joint body in one axial direction. ,
It is possible to easily and quickly perform a predetermined connecting work without requiring a troublesome and troublesome operation such as a screwdriver and without applying a twisting force to the connecting pipe. In particular,
It is suitable for connecting underground buried pipes by operation from the ground like gas pipes and for connecting flexible pipes such as polyethylene pipes. Moreover, since the male and female threads are screwed together, the connected state can be easily released by releasing the male screw through the push ring after the predetermined connection and in the same way as the normal screw tightening release operation. It is also effective for fixing poor connections and replacing connecting pipes.

[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. 3 and 4 are plan views showing a state in which a pushing device for a push ring is attached to a pipe joint, and FIG.
FIG. 5 is a side view of the same, FIG. 5 is a front view showing a part of the device,
FIG. 6 is a front view showing a modification of the connection piece, FIGS. 7 and 8.
FIG. 9 is a partial sectional view showing a main part of a pipe joint using another modification of the connecting piece, FIG. 9 is a partial sectional view showing a use state of the pipe joint according to another embodiment, and FIG. It is explanatory drawing of the conventional piping method. 6 …… Connection pipe, 10 …… Fitting body, 12 …… Female thread, 13 ……
1st taper surface, 14 …… Pressing ring, 17 …… Male thread, 19 …… Elastic member, 20 …… Gasket.

Front Page Continuation (72) Hideo Hirabayashi, Inventor Hideo Hirabayashi 2-12-7 Shimoshinjo, Higashiyodogawa-ku, Osaka City, Osaka Prefecture (56) References )

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 is inserted into an opening of the joint body, and a meshing mechanism interposed between the joint body and the push ring. , Which is disposed between the inner peripheral surface of the joint body and the push ring at a position deeper than the intervening portion of the meshing mechanism, and is formed on the inner peripheral surface of the joint body so that the diameter gradually increases toward the opening end side. In a pipe joint including a gasket that is pressed against the first tapered surface and seals between the joint body and the connection pipe, the meshing mechanism includes a saw blade-shaped female screw provided on the joint body side. , A saw blade-shaped male screw that is provided on the push ring side and that is screwed into the female screw, and one of the female screw and the male screw is configured to be radially expandable and contractable in the radial direction. Possible internal or external thread is engaged with the other It is always elastically biased in the mating direction, and the male screw on the push ring side can go straight over the female screw on the joint body side along with the linear pushing of the push ring in the axial direction. In the other direction, with the rotation of the push ring, the male screw on the push ring side is configured to be screw-movable with respect to the female screw on the joint body side.