JP2000227193A - Connection structure of thermoplastic synthetic resin pipe - Google Patents

Abstract

(57) [Summary] [Problem] It is easy to manufacture, and moreover, it is possible to easily join the receptacle and the insertion port reliably. An insertion port (11) is provided at an end of a rigid vinyl chloride pipe (10).
The insertion port 11 has an insertion bulging portion 11a bulging outward in the circumferential direction so as to open to the inner circumferential surface of the tube, and is formed over the entire circumference by secondary processing. Another rigid PVC pipe 1 into which the insertion port 11 is inserted
0 is provided with a receptacle 12 at the end thereof.
The insertion groove portion 12a opened on the inner peripheral surface of the pipe is formed by secondary processing so that the insertion bulge portion 11a provided in the insertion port 11 is fitted over the entire circumference when the insertion port 11 is inserted. Are formed over the entire circumference in a state of bulging outward along the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mutually connecting a pair of thermoplastic synthetic resin tubes used for a cable sheath tube into which a cable such as an optical fiber cable or a power cable is inserted. About.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 9-159071 discloses a connection structure of a rigid vinyl chloride pipe which is a synthetic resin pipe. In this connection structure, the inner peripheral surface of the socket provided at one end of the synthetic resin pipe has a tapered surface whose diameter is gradually reduced toward the back side, and the difference provided at the other end. The outer peripheral surface of the mouth is a tapered surface similar to the inner peripheral surface of the receiving port. In such a connection structure, an inwardly protruding ridge is formed on the inner peripheral edge of the opening end of the receiving port over the entire circumference, and on the outer peripheral surface of the rear end of the spigot,
A concave groove is provided so that the convex ridge provided in the receptacle is fitted over the entire circumference.

[0003]

In the connection structure having such a configuration, the inner peripheral surface of the receptacle and the outer peripheral surface of the spout are each formed in a tapered shape. It is necessary to provide a concave groove in the mouth, and there is a problem that it is not easy to manufacture the receptacle and the spigot.

The present invention has been made to solve such a problem, and has as its object a simple structure, which can be easily manufactured, and in which the connection between the receiving port and the insertion port is extremely easy. It is an object of the present invention to provide a connection structure for a thermoplastic resin tube that can be used.

[0005]

According to a first aspect of the present invention, there is provided a connecting structure for a thermoplastic synthetic resin pipe, wherein an insertion port provided at an end of one thermoplastic synthetic resin pipe is connected to the other thermoplastic synthetic resin pipe. A connection structure for a thermoplastic synthetic resin pipe inserted into a receptacle provided at an end of the pipe, wherein the receptacle has a fitting for swelling outward along the circumferential direction so as to open on the inner peripheral surface of the pipe. A groove is formed over the entire circumference by secondary processing, and an insertion swelling part swelling outward so as to fit into the insertion groove of the receiving port is formed in the insertion port along the circumferential direction by secondary processing. The insertion groove and the insertion bulge are fitted to each other.

According to a second aspect of the present invention, there is provided a connecting structure for a thermoplastic synthetic resin pipe, wherein an insertion port provided at an end of one thermoplastic synthetic resin pipe is provided at an end of the other thermoplastic synthetic resin pipe. A connection structure of a thermoplastic synthetic resin pipe inserted into the receiving port, wherein the receiving port is formed by secondary processing with a fitting concave portion bulging outward so as to open on the inner peripheral surface of the pipe, The insertion opening has an insertion bulge formed by secondary processing, which bulges outward so as to fit into the insertion dent of the receptacle, and the insertion dent and the insertion bulge are mutually connected. It is characterized by being fitted.

According to a third aspect of the present invention, there is provided a connecting structure for a thermoplastic synthetic resin tube, wherein the thermoplastic synthetic resin is a vinyl chloride resin, and an adhesive is applied to an inner surface of the receptacle and an outer surface of the insertion opening. Features.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of an embodiment of a connecting structure for a thermoplastic synthetic resin pipe according to the first aspect of the present invention. This connection structure is adopted to connect a pair of rigid vinyl chloride tubes 10 which are thermoplastic synthetic resin tubes. The hard vinyl chloride tube 10 has an insertion port 1 at one end.
1 are provided, and a receiving port 12 having a large diameter is provided at the other end so that the insertion port 11 is inserted. Then, the insertion port 1 of the other hard vinyl chloride pipe 10 is inserted into the receiving port 12 of the one hard vinyl chloride pipe 10.
1 is inserted, and a pair of thermoplastic synthetic resin tubes 10 are connected to each other.

An insertion port 11 provided at one end of the rigid vinyl chloride pipe 10 has an insertion swelling outward along the circumferential direction so as to open to the inner peripheral surface of the rigid vinyl chloride pipe 10. The bulging portion 11a is provided over the entire circumference. The insertion bulging portion 11a is formed in a semicircular cross section.

A receiving groove 12a provided at the other end of the rigid vinyl chloride pipe 10 is provided with a fitting groove 12a bulging outward in the circumferential direction over the entire circumference.
The fitting groove 12a is formed in a semicircular cross section opened on the inner peripheral surface of the rigid vinyl chloride pipe 10 so that the inserting bulge 11a provided in the insertion opening 11 can be fitted over the entire circumference. I have. The inner peripheral surface of the insertion groove portion 12a is brought into pressure contact with the entire outer peripheral surface of the inserted insertion bulging portion 11a.

The bulging portion 11a for insertion and the groove portion 12 for fitting.
“a” is formed by secondary processing after molding the hard vinyl chloride pipe 10 in which the insertion port 11 and the receiving port 12 are formed at each end. Swelling part 11 for insertion
a and the fitting groove 12a are inserted into the hard vinyl chloride pipe 10 with the insertion port 11 and the receiving port 12 being heated.
Is formed by feeding compressed air while pressing a ring-shaped split mold having a circular cross section from the inner peripheral surface of the mold over the entire circumference.

In such a connection structure, the insertion port 11 of one hard vinyl chloride pipe 10 is inserted into the receptacle 12 of the other hard vinyl chloride pipe 10, and the insertion bulging portion 11 a of the insertion port 11 is formed. The insertion port 11 and the reception port 12 are connected to each other by being inserted into the insertion groove 12a of the reception port 12. Insertion groove 12a and insertion bulge 11a
Means that the insertion port 11 inserted into the receiving port 12 does not fall out of the receiving port 12 because of being pressed against each other.

In this case, an adhesive is applied to the entire inner peripheral surface of the fitting groove 12a provided in the receiving port 12 and the entire outer peripheral surface of the insertion bulging portion 11a provided in the insertion port 11, respectively. Is also good. When the adhesive is applied, the swelling portion 11a of the insertion port 11 is usually inserted into the insertion groove 12a of the receiving port 12, and then is held for a certain period of time, so that the adhesive is solidified and connected. Is completed.

In the above embodiment, the hard vinyl chloride pipe 10 has been described as a thermoplastic synthetic resin pipe, but the present invention is not limited to this. Also, the insertion port 11
Swelling portion 1 provided in each of receiving holes 12
1a and the fitting groove 12a do not need to be formed in a semicircular cross-section, respectively, and have an appropriate cross-sectional shape such that they do not easily come out of the insertion bulging portion 11a fitted into the fitting groove 12a. It may be.

In one embodiment of the connection structure for thermoplastic synthetic resin pipes according to the second aspect of the present invention shown in FIG. 2, a fitting groove portion is provided in the receptacle 12 over the entire circumference along the circumferential direction. A substantially hemispherical insertion concave portion 12b is provided in place of 12a, and a substantially hemispherical insertion bulge portion 11b is provided in place of the insertion bulge portion 11a provided in the insertion opening 11 along the circumferential direction. 1, except that the inner peripheral surface of the insertion concave portion 12b is pressed against the outer peripheral surface of the inserted insertion bulge portion 11b. Since the connection structure of the thermoplastic synthetic resin pipe is the same as that of the embodiment, the description is omitted.

An insertion bulging portion 11b and a fitting concave portion 12b provided in the insertion opening 11 and the receiving opening 12, respectively.
Need not be formed in a hemispherical shape,
Inserted bulging portion 11b fitted in fitting concave portion 12b
An appropriate shape that does not easily come out from the inside may be used.

Further, the number of the bulging portion 11b for insertion and the number of the concave portion 12b for fitting are not limited to one each, and two or more bulging portions 11b and two or more may be continuously provided at equal intervals along the circumferential direction. Alternatively, the fitting recess 12b may be provided more than the insertion bulging portion 11b.

[0019]

According to the first aspect of the present invention, the connection structure of the thermoplastic synthetic resin pipe is provided with the fitting groove and the insert formed in the receiving port and the insertion port of the thermoplastic synthetic resin pipe by the secondary processing, respectively. The swelling portion is provided with a simple configuration, can be easily manufactured, and can be easily and reliably joined to the receiving port and the insertion port. The connecting structure for a thermoplastic synthetic resin pipe according to the second aspect of the present invention provides a fitting concave portion and an insert bulging portion formed by secondary processing at the receiving port and the insertion port of the thermoplastic synthetic resin pipe. Is provided, and can be easily manufactured, and furthermore, the receiving port and the insertion port can be easily joined reliably. In the connection structure of the thermoplastic synthetic resin pipe according to the third aspect of the present invention, when an adhesive is applied to the vinyl chloride resin pipe and joined, sufficient adhesion strength can be obtained even if initial holding is omitted.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of a connection structure for a thermoplastic synthetic resin pipe according to the first embodiment of the present invention.

FIG. 2 is a sectional view showing an example of an embodiment of a connecting structure for a thermoplastic synthetic resin pipe according to the invention of claim 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hard vinyl chloride pipe 11 Insertion opening 11a Expansion part for insertion 11b Expansion part for insertion 12 Reception port 12a Groove part for fitting 12b Concave part for fitting

Claims (3)

[Claims] 1. A connection between a thermoplastic synthetic resin pipe inserted into a receptacle provided at an end of one thermoplastic synthetic resin pipe and a receptacle provided at an end of the other thermoplastic synthetic resin pipe. In the receiving port, a fitting groove portion bulging outward along the circumferential direction so as to open to the inner peripheral surface of the pipe is formed over the entire periphery by secondary processing, and the insertion port has a An insertion bulge that bulges outward so as to fit into the fitting groove is formed along the circumferential direction by secondary processing, and the fitting groove and the insertion bulge are fitted to each other. A connection structure for a thermoplastic synthetic resin pipe. 2. A connection between a thermoplastic synthetic resin pipe inserted into an insertion port provided at an end of one thermoplastic synthetic resin pipe and a receptacle provided at an end of the other thermoplastic synthetic resin pipe. The receiving port is formed with a fitting recess bulging outward so as to open to the inner peripheral surface of the tube by secondary processing, and the fitting port is fitted into the fitting recess of the receiving port. The thermoplastic resin is characterized in that the bulging portion for insertion bulging outward is formed by secondary processing, and the concave portion for fitting and the bulging portion for insertion are fitted to each other. Pipe connection structure. 3. The connecting structure for a thermoplastic synthetic resin pipe according to claim 1, wherein the thermoplastic synthetic resin is a vinyl chloride resin, and an adhesive is applied to an inner surface of the receptacle and an outer surface of the insertion opening.