JPH0341188Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a so-called universal joint for synthetic resin pipes that allows angle adjustment.

(Prior Art) A socket part 2' having a spherical inner surface is formed at one end of a synthetic resin pipe 1', and a core for inserting the pipe having a spherical outer surface is provided in the socket part 2'. Insert 3',
Universal joints that allow angle adjustment by mutually sliding their fitting portions are well known (see FIG. 3). In addition, 30' and 31' are annular grooves,
Annular seal members 5' and 6' are attached to the grooves 30' and 31', respectively.

(Problems to be Solved by the Present Invention) However, in such conventional universal joints, the core 3' is movable, so when the connecting pipe 4' is inserted into the core 3', the core 3' There was a problem in that the sockets 2' moved independently and were difficult to insert.

In addition, the connecting pipe 4' is connected to the open end of the socket part 2' of the pipe body.
Since the rotation is not restricted until it contacts P', if an excessive bending load M' is applied to the connecting pipe 4' due to forced construction or ground subsidence after burial, the opening end P of the socket 2' There was a problem that the connecting tube 4' was pushed wide by the connecting tube 4' and damaged, or conversely, the connecting tube 4' was damaged.

(Means for Solving the Problems) The present invention was made to solve the above-mentioned problems, and the gist thereof is to provide a pipe body having a socket portion with a spherical inner surface at the end. and a core for pipe insertion that is rotatably inserted into the socket of the pipe body and has an inner surface shape that is approximately the same as the outer surface shape of the connecting pipe, wherein the socket is rotatably inserted into the socket. A flexible synthetic resin pipe, characterized in that a concave groove is provided on the inner surface on the back side of the part, and a locking part is provided for regulating the rotation angle of the core by installing a split ring in the concave groove. It exists in the joint.

(Function) As described above, a concave groove is provided on the inner surface of the inner side of the inner side of the socket portion of the pipe body, and a locking portion for regulating the rotation angle of the core is provided by attaching a split ring to the concave groove. Therefore, by bringing the inner end surface of the core into contact with the locking portion and locking the core, the connecting tube can be easily inserted. Further, when the inclination angle of the connecting tube reaches a predetermined angle, the inner end surface of the core comes into contact with the locking portion and is locked, so that rotation of the connecting tube is restricted.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

First, the configuration of the embodiment shown in FIGS. 1 and 2 will be explained.

The synthetic resin universal joint A is composed of a tube body 10 and a core 20 for inserting a tube.

The tube body 10 has inner and outer surfaces 12 at one end of the straight tube section 11.
Both a and 12b have a spherical bulging socket 1.
It has 2. The straight tube part 11 and the socket part 12 are connected by an annular bulge part 13. Annular bulge 1
A concave groove 14 is formed on the inner surface of 3. Concave groove 1
A flange portion 31 of a split ring 30 for locking is mounted inside the locking portion 4 to provide a locking portion S. Split ring 3
The shape of 0 may be determined depending on the shape of the groove 14. The size of the split ring 30 may be such that a part of the split ring 30 is always included inside the extension line of the spherical inner surface 12b of the socket portion 12.

The opening end P of the socket 12 into which the connecting pipe 40 is inserted is slightly enlarged in diameter.

The tube body 10 is made of, for example, a synthetic resin such as hard vinyl chloride resin, and is molded by blow molding or injection molding. The split ring 30 is
The material is not particularly limited as long as it has elasticity against deformation to a certain extent, and any material molded from synthetic resin such as hard vinyl chloride resin, metal, or the like may be used.

The core 20 is rotatably inserted into the socket 12 of the tube body 10, and its outer surface shape 20a is substantially the same as the inner surface shape 12b of the socket section 12, and the inner surface shape 20b is the same as that of the connecting pipe 40. The outer surface shape is substantially the same as the outer surface shape 40a. An annular sealing member 22 is attached to an annular groove 21 on the outer surface of the core 20 to maintain fluidity and watertightness between the tubular body 10 and the core 20, and an annular groove 23 on the inner surface of the core 20 is attached to the annular groove 21 on the outer surface of the core 20.
An annular sealing member 24 is attached to maintain watertightness between the connecting pipe 40 and the connecting pipe 40 . For example, the core 20 is
Made of synthetic resin such as hard vinyl chloride resin,
Molded using injection molding method.

In addition, 25 is a stopper, and is for regulating the insertion length of the connecting pipe 40.

The synthetic resin pipe universal joint A is formed as follows. Seal members 22 and 24 are installed in the annular grooves 21 and 23 of the core 20, respectively, and then
The core 20 is elastically flattened in the radial direction to form the tube body 10.
Forcibly insert it into the socket 12 of. After inserting
Rotate the core 20 and align the axis of the core 20 with the socket part 1
Align it with the axis of 2. Next, the diameter of the split ring 30 is reduced, the flange 31 is attached to the groove 14, and the diameter is released from the reduced diameter state to be locked in the groove 14, thereby obtaining the universal joint A shown in FIG. It will be done.

Next, the operation of the embodiment will be explained.

The connecting tube 40 is connected by inserting its end into the inner surface of the core 20. As shown in FIG. 2, this connecting tube 40 is inserted in a state in which rotation of the core 20 is restricted by bringing the back end surface Q of the core 20 into contact with the locking portion S, that is, the core 20 is held at a predetermined angle. This can be done smoothly by inserting the connecting pipe 40 in a state where it has been rotated until the end.

Further, when the connecting pipe 40 is inserted to a position where the end surface contacts the stopper 25, movement of the universal joint A toward the back side is restricted.

When a bending load M is applied to the connecting pipe 40 connected to the universal joint A, the connecting pipe 40 rotates together with the core 20 about the center of the socket 12 as a fulcrum. still,
The rotation of the connecting tube 40 and the core 20 is restricted by the locking portion S when the inner end surface Q of the core 20 comes into contact with the locking portion S, as shown in FIG.

Therefore, even if an unreasonable bending load M is applied to the connecting pipe 40, the connecting pipe 40 will not hit the open end P of the socket 12.
Alternatively, deformation and damage of the connecting pipe 40 can be prevented.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to the above embodiments, and the present invention may be modified without departing from the gist of the present invention. include.

For example, in the above embodiments, the tubular body has a long straight pipe portion at one end, but the straight pipe portion of the tubular body may be short. In addition to the straight pipe section, it may also be a curved pipe section. Furthermore, in the case of a short length, a mounting plate having, for example, an arcuate cross section may be provided at the end.

Further, the locking portion is not limited to that shown in the embodiments, but may be any locking portion as long as it can regulate the rotation angle of the core to a predetermined angle.

(Effects of the invention) As described above, in the universal joint for synthetic resin pipes of the invention, a groove is provided on the inner surface of the back side of the socket,
A split ring is attached to the concave groove, and a locking part is provided to restrict the rotation angle of the core, so by bringing the back end surface of the core into contact with the locking part and locking it, the core can be locked. This prevents rotation of the connecting tube, making it easier to insert the connecting tube into the core, and making it possible to connect the connecting tube smoothly. Furthermore, when the inclination angle of the connecting pipe reaches a predetermined angle, when the inner end surface of the core is in contact with the above-mentioned locking part and is locked, the outer surface of the connecting pipe is attached to the open end of the socket. If they do not come into contact with each other, the opening end of the socket will not be pushed open by the connecting pipe and will not be damaged, or the connecting pipe will not be damaged.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing an example of the synthetic resin pipe universal joint of the present invention, and FIG. 3 is a cross-sectional view showing a known synthetic resin pipe universal joint. DESCRIPTION OF SYMBOLS 10... Pipe body, 12... Socket part, S... Locking part, 20... Core, 40... Connection pipe.

Claims (1)

[Scope of utility model registration request] A tube body having a socket portion with a spherical inner surface shape at the end, and a tube insertion tube that is rotatably inserted into the socket portion of the tube body and has an inner surface shape that is approximately the same as the outer surface shape of the connecting tube. In the universal joint for synthetic resin pipes, a groove is provided on the inner surface on the back side of the socket part, and a split ring is attached to the groove to regulate the rotation angle of the core. A universal joint for synthetic resin pipes, characterized by being provided with a stop.