JP2001263557A - Synthetic resin pipe and conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture at a low cost and lighten the weight, to simply construct, and to prevent the pressure with standing strength of a conduit 12 from lowering by eliminating the possibility of damaging a synthetic resin pipe 10 in a connecting part. SOLUTION: The synthetic resin pipe 10 is cut into a necessary length and an insertion port 14a of one synthetic resin pipe 10 is inserted in a rubber band receiver port 16 of the other synthetic resin pipe 10. A projection 18 formed in the outer face of the insertion port 14 is pushed in the depth of the receiver port extending over the rubber band 30 and a release-preventing ring 32. After the construction, if the insertion port 14a is pulled out of the rubber band receiver port 16, then the projection 18 is engaged with a release-preventing ring 32. Therefore, even if the insertion port 14a is pulled out of the rubber band receiver port 16 by a prescribed length, it is prevented from being pulled out further more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe and a pipe, and more particularly to a synthetic resin pipe and a pipe having, for example, a function of expanding and contracting and a function of preventing separation.

[0002]

2. Description of the Related Art It is well known that a rubber ring connection method is used for connecting portions of pipes in order to secure the elasticity of the pipes. However, in the rubber ring connection method, when an excessive external force acts on the pipeline, there is a possibility that the opening is pulled out from the rubber ring receiving port and detached.

Therefore, conventionally, the detachment of the insertion opening 2 has been prevented by using a detachment prevention tool 1 as shown in FIG. That is, the first locking portion 5 is mounted on the outer peripheral surface of the receiving tube 4 in which the rubber ring receiving port 3 is formed, and the second locking portion 7 is mounted on the outer peripheral surface of the inserting tube 6 in which the insertion hole 2 is formed. And the first locking portion 5 and the second locking portion 7 are connected by the arm 8.

[0004]

In the prior art, the first locking portion 5 and the second locking portion 7 had to be fixed to the outer surfaces of the receiving tube 4 and the insertion tube 6, so that the receiving tube was required. 4 and the insertion tube 6 are damaged, and there is a problem that the pressure resistance of the pipeline is reduced.

Further, since the first locking portion 5 and the second locking portion 7 are made of cast iron, there is a problem that they are easily corroded, inconvenient for transportation and handling, and costly.

[0006] Furthermore, since the number of parts is large, the number of steps is increased, and there is a problem that workability is poor.

SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a lightweight and simple construction and prevent damage to a pipe.
It is to provide a synthetic resin pipe and a conduit.

[0008]

A first aspect of the present invention is a synthetic resin pipe having a rubber ring socket at one end, and a rubber ring and a separation preventing ring attached to the rubber ring socket. This is a synthetic resin pipe in which a plurality of projections are formed at regular intervals in the pipe axis direction on the outer surface of the wall, and the projections have tapered surfaces on the side opposite to the rubber ring socket.

According to a second aspect of the present invention, there is provided a receiving pipe in which a rubber ring receiving portion for receiving a rubber ring and a ring receiving portion for receiving a separation preventing ring are formed on an inner surface of a receiving port, and a pipe axial direction on an outer surface of a pipe wall. A plurality of protrusions are formed at regular intervals to the insertion port, and the insertion port is inserted into the receiving port, and the projection is locked to the disengagement prevention ring when the insertion port is pulled out from the receiving port. Road.

[0010]

The synthetic resin pipe of the first invention is cut to a required length,
The opening is inserted into the rubber ring socket of another synthetic resin tube. Then, the protrusion formed on the outer surface of the insertion port is pushed into the rubber ring receiving port beyond the rubber ring and the separation prevention ring.
At this time, since the tapered surface of the projection enlarges the diameter of the rubber ring and the separation prevention ring, there is no fear that the projection may hinder the insertion of the insertion opening. After connecting the pipes, when trying to pull out the insertion port from the rubber ring socket, the projection on the outer surface of the insertion port is locked by the separation prevention ring. Therefore, when the insertion port is pulled out from the rubber ring receiving port by a predetermined length, it is not further pulled out.

[0011]

According to the present invention, since there is no need to separately prepare a detachment prevention device, it is possible to manufacture the device at low cost and to reduce the weight. Further, since it is only necessary to cut the synthetic resin pipe to a required length and insert it into the rubber ring socket, the workability can be greatly improved. Further, since there is no fear that the pipe is damaged, it is possible to prevent a decrease in the pressure resistance of the pipe.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
Reference numeral 0 denotes a pipe 12 such as a water pipe or a sewer pipe, which is integrally formed of a synthetic resin such as vinyl chloride.

The synthetic resin pipe 10 has a straight pipe portion 14 and a rubber ring receiving port 1 formed by expanding the diameter from one end of the straight pipe portion 14.
6 inclusive.

The straight pipe section 14 is a part constituting a main part of the pipe line 12, and the tip of the straight pipe section 14 is an insertion port 14a. As shown in FIG. 2, a plurality of projections 18 are provided on the outer surface of the straight pipe portion 14 at regular intervals in the pipe axis direction.
Is formed. Each of the projections 18 is formed in a flange shape over the entire circumference of the straight pipe portion 14.
The side surface on the sixth side is a stopper surface 20 perpendicular to the pipe axis, and a taper surface 22 inclined at a predetermined angle is formed on the side opposite to the rubber ring receiving port 16.

The rubber ring receiving port 16 is a portion for receiving the insertion port 14a in another synthetic resin pipe 10, and the rubber ring receiving port 1 is provided.
6, a rubber ring receiving portion 24 is formed near the open end, a ring receiving portion 26 is formed behind the rubber ring receiving portion 24, and a shaft of the insertion opening 14a is formed behind the ring receiving portion 26. An expansion / contraction absorber 28 that secures movement in the direction is formed. Then, the rubber ring 30 is mounted on the rubber ring receiving portion 24, and the separation preventing ring 32 is mounted on the ring receiving portion 26.

As shown in FIG. 3, the detachment preventing ring 32 is a C ring made of a metal such as stainless steel or a hard plastic, and a tapered surface 34 is formed on the inner surface of one end of the detachment preventing ring 32. On the other end side surface, a locking surface 36 on which the projection 18 is locked is formed perpendicular to the axis.

When manufacturing the synthetic resin tube 10, first,
A tube 40 having a flat portion 40a and a protruding portion 40b as shown in FIG. 4 is manufactured using an apparatus 42 as shown in FIG. 5, and then the rubber ring socket 16 is formed in the flat portion 40a of the tube 40. Secondary molding. Apparatus 42 (FIG. 5) includes an extruder 44, a projection former 46 and a cutter 48.

The extruder 44 includes an extruder 52 for extruding the synthetic resin material (vinyl chloride, polyethylene, etc.) supplied from the hopper 50 by heating and melting the extruder.
The mold 54 is attached to the outlet 2. The mold 54 is
A circular tube 56 is extruded at a constant speed from between the inner surface of the die ring and the outer surface of the mandrel, including a die ring and a mandrel not shown.

The protrusion forming machine 46 forms the protrusions 18 on the outer surface of the circular tube 56 extruded from the extruder 44 while taking out the circular tube 56, and forms a belt-like shape for forming the lower half of the tube 40 (FIG. 4). And a belt-shaped second portion 46b for forming the upper half.

The first portion 46a is formed by connecting a required number of blocks 58 with grooves as shown in FIG. 6 and blocks 60 without grooves as shown in FIG.

The grooved block 58 (FIG. 6) has a body 5 having an inner surface along the outer surface of the lower half of the protruding portion 40b (FIG. 4).
8a, and a protrusion forming groove 58b is formed on the inner surface of the main body 58a.
Is formed, and a fitting projection 58c is formed on the upper surface of the main body 58a. On the other hand, the non-grooved block 60 (FIG. 7) includes a main body 60 a having an inner surface along the outer surface of the lower half of the flat portion 40 a (FIG. 4). A fitting protrusion 60c is provided on the upper surface of 60a.
Is formed. A predetermined number of the grooved blocks 58 and the grooveless blocks 60 are connected to each other to form one unit, and a plurality of these units are connected to form the first portion 46a.

The second portion 46b includes the same number of grooved blocks 58 'and grooveless blocks 60' as the grooved blocks 58 and grooveless blocks 60 in the first portion 46a. Grooved block 58 'and non-grooved block 60'
Are formed in the same shape and the same size as the grooved block 58 and the non-grooved block 60, and holes are formed on the lower surfaces thereof so as to be fittable with the fitting protrusions 58c and 60c.

The first part 46a and the second part 46b
And the first portion 46a is rotated clockwise by a motor (not shown), and
The second portion 46b is rotated counterclockwise. Therefore, when the circular tube 56 is provided to the projection molding machine 46, the circular tube 56 is taken up at a predetermined speed by the first portion 46a and the second portion 46b.

In the tube 40, as shown in FIG. 4, the volume per unit length of the flat portion 40a is made larger than the volume per unit length of the protruding portion 40b. Therefore,
To manufacture the tube 40, the amount of synthetic resin material supplied to the non-grooved blocks 60 and 60 'must be
And 58 '. Therefore, in this embodiment, by controlling the number of rotations of the motor, the non-groove blocks 60 and 6 are controlled.
Speed v1 at which circular pipe 56 is pulled while pressing 0 '
However, the speed is lower than the speed v2 at which the circular tube 56 is drawn while pressing the grooved blocks 58 and 58 '.

The tube 62 sent out from the projection molding machine 46
As shown in FIG. 8, is a continuous pipe in which the pipe 40 is continuous, and the continuous pipe 62 is cut at a predetermined position by a cutting machine 48 (FIG. 5).

The cutting machine 48 includes a sensor (not shown) for detecting a cutting position of the continuous pipe 62 (a position indicated by a dashed line in FIG. 8) and a saw tooth 64 driven in conjunction with the sensor. As the sensor, for example, a sensor that detects the cutting position by counting the number of projections 18 or a sensor that detects the cutting position by measuring the distance from the tip of the continuous pipe 62 can be used. The continuous pipe 62 is provided to the cutting machine 48, and when the cutting position is detected by the sensor, the continuous pipe 62 is cut at the cutting position to obtain the pipe 40 (FIG. 4).

In the next step, the rubber ring socket 16 is secondarily formed in the flat portion 40a of the tube 40 (FIG. 4). That is, the flat portion 40a is heated and softened, and is covered with the outer surface of the inner mold (not shown), and the outer mold (not shown) is pressed against the outer surface of the flat portion 40a to form the rubber ring receiving port 16. The rubber ring 30 is inserted into the rubber ring receiving portion 24 of the rubber ring receiving port 16.
Is attached, and the detachment prevention ring 32 is attached to the ring receiving portion 26.

When connecting the synthetic resin pipes 10 to each other, first, the straight pipe section 14 is cut to a required length according to the site conditions, and the outer peripheral portion of the cut end is chamfered. And
The insertion port 14a of one synthetic resin pipe (insertion pipe) 10 is inserted into the rubber ring socket 16 of the other synthetic resin pipe (receiving pipe) 10, and as shown in FIG. The tip of 14a is positioned at the center of the elastic absorption portion 28. In the insertion step of the insertion opening 14a, as shown in FIG. 9, the tapered surface 22 of the projection 18 enlarges the diameter of the rubber ring 30 and the separation prevention ring 32, so that the projection 18 hinders the insertion of the insertion opening 14a. Don't worry.

When the pipe 12 is stretched due to heating or the like after the construction, as shown in FIG. 10A, the insertion port 14a is further inserted into the rubber ring receiving port 16 so that the pipe 12 is inserted. Twelve extensions are absorbed. On the other hand, when the pipe 12 contracts due to cooling or the like, as shown in FIG. 10B, the insertion port 14a is pulled out from the rubber ring receiving port 16 to compensate for the contraction of the pipe 12. . When the insertion opening 14a is pulled out by a predetermined length, the protrusion 18 on the outer surface of the insertion opening 14a is locked by the separation preventing ring 32, and further drawing out is prohibited.

According to this embodiment, it is not necessary to separately prepare the detachment preventing device 1 (FIG. 14) as in the prior art, so that the manufacturing cost can be reduced and the weight can be reduced.

Further, since it is only necessary to cut the synthetic resin pipe 10 to a required length and insert it into the rubber ring socket 16,
Workability can be greatly improved. In other words, since the plurality of projections 18 are formed on the outer surface of the synthetic resin pipe 10 at regular intervals in the pipe axis direction, even when the synthetic resin pipe 10 is cut to a required length on site, the remaining projections 18 A detachment prevention function can be ensured, and there is no need to add a special mechanism.

Further, since there is no fear that the synthetic resin pipe 10 is damaged at the connection portion, a decrease in the pressure resistance of the pipe 12 can be prevented.

In the above-described embodiment, each of the projections 18 is formed in a flange shape. However, as shown in FIG. 11, for example, the projections 18 may be divided into a plurality in the circumferential direction. For example, as shown in FIG.
May be formed into a curved surface having a substantially semicircular cross section.

In the above embodiment, the ring receiving portion 2
6, a reinforcement member 66 is disposed in the ring receiving portion 26, and the reinforcement member 66 is attached to the reinforcement member 66 as shown in FIG.
2 may be attached. The reinforcing member 66 is formed in a ring shape or a C-ring shape with a substantially U-shaped cross section, and is incorporated into the ring receiving portion 26 at the time of secondary molding of the rubber ring receiving port 16 or after the molding.

Further, in the above embodiment, the rubber ring socket 1
6 is formed secondarily, but it may be formed simultaneously with the projections 18 using a projection forming machine 46. However, in this case, it is necessary to use a block adapted to the shape of the rubber ring socket 16 instead of the non-grooved blocks 60 and 60 '(FIG. 7).

[Brief description of the drawings]

FIG. 1 is an illustrative view showing a synthetic resin pipe and a pipe according to an embodiment of the present invention;

FIG. 2 is a perspective view showing an insertion hole and a projection.

FIG. 3 is a perspective view showing a detachment prevention ring.

FIG. 4 is an illustrative view showing a tube obtained by primary molding;

FIG. 5 is an illustrative view showing a device for manufacturing the tube of FIG. 4;

FIG. 6 is an illustrative view showing a grooved block;

FIG. 7 is an illustrative view showing a grooveless block;

FIG. 8 is an illustrative view showing a continuous pipe;

FIG. 9 is an illustrative view showing a step of connecting synthetic resin tubes to each other;

FIG. 10 is an illustrative view showing a stretching function and a separation preventing function of the synthetic resin tube;

FIG. 11 is an illustrative view showing another embodiment of the present invention;

FIG. 12 is an illustrative view showing another embodiment of the present invention;

FIG. 13 is an illustrative view showing another embodiment of the present invention;

FIG. 14 is an illustrative view showing a conventional technique;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Synthetic resin pipe 12 ... Pipe line 14 ... Straight pipe part 16 ... Rubber ring socket 18 ... Projection 22 ... Tapered surface 24 ... Rubber ring receiving part 26 ... Ring receiving part 28 ... Elastic expansion part 30 ... Rubber ring 32 ... Detachment Prevention ring

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Yoshisuke Matsushita 64, Ishizukita-cho, Sakai-shi, Osaka F-term in Kubota Vinyl Pipe Factory (reference) 3H015 FA04 FA06 3H104 JA08 JB02 JC10 JD09 KA04 KB03 KB07 KB11 LG03 LG22 3H111 AA01 BA15 CB02 CB14 CB23 CB27 CB28 DA08 DA26

Claims (2)

[Claims] 1. A synthetic resin pipe having a rubber ring receiving port at one end, and a rubber ring and a separation preventing ring attached to the rubber ring receiving port, wherein a predetermined interval is provided in a pipe axial direction on an outer surface of a pipe wall. A plurality of projections formed at a distance from each other, and a tapered surface is formed on a side of each of the projections opposite to the rubber ring receiving port. 2. A receiving pipe formed on an inner surface of a receiving port and a receiving pipe formed on an inner surface of a receiving port and a ring receiving section receiving a rubber ring and a ring receiving section receiving a separation-preventing ring are spaced apart from each other by a predetermined distance in the pipe axis direction. A pipe formed with a plurality of projections spaced therebetween and inserted into the socket, wherein the projections are locked to the detachment prevention ring when the insertion pipe is pulled out from the socket; .