JPH028152Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a joint socket made of reinforced resin.

(Prior Art) It is already known to perform a plug-in connection when connecting pipes made of reinforced resin. Plug-in connection is a method in which a socket is provided at one end of the pipe, a socket is provided at the other end, and the socket is inserted into the socket and fixed. In that case, as shown in Fig. 4, the socket is provided with a sloped part A at one end of the pipe and enlarged one end.
An annular groove B extending circumferentially on the inner surface of the enlarged part
A rubber ring C was fitted into the groove, and an annular raised portion D was formed on the outer surface at the position where the groove B was provided. On the other hand, the spout had the same shape as the original tube. In such a plug-in connection, the rubber ring C tightened the outer surface of the plug and the connection was kept airtight.

However, if you just tighten it with rubber ring C,
The spout easily escapes from the socket. Therefore, an escape prevention device was installed to prevent escape. As an escape prevention device, as shown in Fig. 5, a ring X is attached to the socket, a flanged short pipe Y is attached to the spigot, and the ring X and the flanged short pipe Y are Bolt Z between
It was fixed in place.

In this case, there was a sloped part on the side of the pipe socket that gradually became thicker toward the end of the pipe, so the ring X was fixed there. On the other hand, since there is no such sloped part on the side of the spout, it was decided to provide a protrusion E on the outer surface of the tube, and to penetrate the flanged short tube Y through the protrusion E to lock it. Since this tube is made of a reinforced resin, for example, a polyester resin reinforced with glass fibers, special ingenuity was required to provide the protrusion E.

In JP-A-56-133131, in order to provide a protrusion E on the outer surface of the tube, the part that should become the protrusion is made separately and integrally with the pedestal, and the pedestal is embedded in the tube. It was taken as a fact. That is, as shown in FIG. 5, the protrusion E was previously made integrally with the pedestal F, the pedestal F was embedded in the tube, and the protrusion E was made to protrude. but,
The socket was supposed to simply fit the ring X as mentioned above.

(Problems to be Solved by the Invention) As described above, in order to prevent pipes from escaping in reinforced resin pipes, until now the only thing that has been done is to fit a ring X around the socket. Ring X was sometimes split into two parts, but it is cumbersome to fit such a ring each time a connection is made. So we needed to make this even easier.

(Means for Solving the Problems) In order to solve the above-mentioned problems, this invention attempts to provide a locking protrusion on the socket in the same way as on the spigot. In this case, as taught in Japanese Unexamined Patent Publication No. 56-133131, the protrusion itself is made separately and integrally with the pedestal, and is attached to the side of the pipe socket. However, since the tension applied to the escape prevention device is large, the protrusion needs to be firmly attached.

Therefore, the inventor proposed a structure in which the socket of the reinforced resin tube has an annular groove extending in the circumferential direction on the inner surface, and a rubber ring is fitted into the groove, so that the socket has an annular ridge on the outer surface. Therefore, I found it convenient to attach a protrusion there. In addition, the protrusion has a shape with a pedestal along the above-mentioned slope, and further, the fibers that constitute the reinforced resin are wrapped around the pedestal to firmly fix the pedestal to the socket, and the fibers are hardened with a hardening resin. We have found that it is convenient to combine them into one. It has also been confirmed that when a plurality of such protrusions are attached at intervals in the circumferential direction, the protrusions are firmly fixed to the socket, and the protrusions do not come off even when subjected to tension. This idea was made based on such confirmation.

(Summary of the invention) This invention is a reinforced resin tube with an annular groove extending in the circumferential direction on the inner surface of the tube, a rubber ring fitted into the groove, and an inclined portion on the outer surface that tapers toward the tube end. In the socket, a plurality of protrusions made of a hard material each having a pedestal along the sloping part and having a locking part erected on a part of the pedestal are arranged at intervals in the circumferential direction on the sloping part, Provided is a joint socket made of reinforced resin, which is integrated with a pipe by winding fibers or threads around a pipe through a base and solidifying the fibers or threads with a curable resin capable of adhering to the resin. It is something to do.

(Example) This invention will be explained based on the drawings as follows. FIG. 1 is a partially cutaway perspective view of a joint socket made of reinforced resin according to this invention. FIG. 2 is a perspective view showing an example of a protrusion used in this invention. FIG. 3 is a side view of the socket showing the state in which the fibers or threads are wound.

As shown in FIG. 1, the joint socket according to this invention has an annular groove 1 on the inner surface of the tube, a rubber ring 2 is fitted into the groove 1, and an annular raised part 3 on the outer surface. In a joint socket made of reinforced resin, a protrusion 6 is attached to the sloping part of the annular raised part 3 that becomes thicker toward the pipe end, with a pedestal 4 attached, and the locking part 5 is made to stand up toward the outside. , a thread 7 is wound around the tube by hanging it on a pedestal 4, and the thread 7 is impregnated with a curable resin 8 and cured, so that the whole is integrated.

In this invention, a protrusion 6 is used, but it is sufficient if the protrusion 6 is made of a hard material. The material is metal,
It may be any resin. Metals include iron,
Cast iron, aluminum, etc. can be used, and as the resin, in addition to reinforced thermosetting resins and reinforced thermoplastic resins, polyethylene, polypropylene, polyamide, etc. can be used. However, when polyethylene or polypropylene is used, its surface is oxidized to improve adhesion to the resin 8.

The protrusion 6 needs to have the base 4 and the locking part 5. It is necessary that the lower surface of the pedestal 4 has a shape that follows the slope of the outer surface of the tube, which tapers toward the end of the tube. For this purpose, if necessary, the shape of the pedestal 4 is changed or a hardening resin is applied to the outer surface of the tube to modify the surface shape of the tube. The locking part 5 is a part of the pedestal 4 that stands up from the surface of the pedestal,
It is integrated with the pedestal 4. The locking part 5 is attached to the base 4
When the tube is brought into contact with the inclined portion of the tube, it is desirable that the upright surface located on the opposite side of the tube end be perpendicular to the tube axis and recessed further inward.

The pedestal 4 can have a large number of incisions extending through its thickness, or can have a large number of irregularities on its surface to facilitate the retention of threads or fibers and to further strengthen the adhesion to the resin. .

The protrusion 6 is not limited to that shown in FIG. for example,
The structure shown in FIG. 2 may also be used. The protrusion 6 in FIG. 2 has two surfaces on the lower surface of the pedestal 4: a surface 41 that follows an inclined part that becomes thicker toward the tube end, and a surface 42 that runs parallel to the tube axis direction. , a clear ridge line is formed between both sides. Further, the lower surface of the pedestal 4 has an arc shape along the outer surface of the tube in a direction perpendicular to the tube axis direction. The locking surface of the locking portion 5 is a portion numbered 51. The shape of the locking portion 5 may be circular instead of bifurcated as shown in the figure.

A plurality of protrusions 6 are arranged at intervals along the circumferential direction on the tapered slope of the outer surface of the socket. The arrangement positions should be equally spaced, such as at both ends of one diameter when two protrusions 6 are attached, and at trisecting points on the circumference when three protrusions 6 are attached. desirable.

After attaching the protrusion 6, it is placed on the base 4 and a thread or fiber 7 (hereinafter simply referred to as thread) is wound thereon. The thread must be long enough to cover at least one turn around the tube. The yarn is hung on the base 4 and wound around the tube. At this time, in order to ensure that the pedestal 4 follows the slope of the tube, as shown in FIG. It is preferable.

When the yarn 7 is wound, it may already contain a curable resin. However, the yarn may later be impregnated with a curable resin. In any case, the wound yarn is sufficiently impregnated with a curable resin, and then the resin is cured to unite the whole. What was created in this way is the joint socket according to this invention.

As the yarn 7, various materials can be used. For example, glass fiber, carbon fiber,
Other natural or synthetic fibers can be used. Cotton can be used as a natural fiber, and vinylon, nylon, etc. can be used as a synthetic fiber. The yarn may be woven or not woven, and may be tape-shaped.

As the curable resin, unsaturated polyester resin and epoxy resin are used. This is the same material that constitutes the reinforced resin from which conventional joint sockets are made. Therefore, the hardening resin will strongly adhere to the joint socket made of reinforced resin. Therefore, when the curable resin is cured,
The wound thread is strongly adhered to the outer surface of the joint socket, and the whole becomes a strong one piece.

(Effects of the invention) According to this invention, since a plurality of protrusions are fixed to the socket of the reinforced resin pipe at intervals in the circumferential direction,
By inserting a locking tool such as a bolt into the locking portion of this protrusion, it is possible to easily prevent the tube from escaping. This makes it much easier to fix the locking tool compared to the conventional method of fitting a ring, and therefore facilitates the connection operation. Further, according to this invention, a protrusion made of a hard material having a pedestal along the inclined part and having a locking part erected in a part of the pedestal is brought into contact with the tapered inclined part of the outer surface of the pipe socket, By wrapping the fiber or yarn around the tube through its base, the protrusion is firmly attached to the outer surface of the tube. In addition, since the fibers or threads are hardened with a curable resin to make the whole piece into one piece, the protrusion has a structure in which its base is buried in the reinforced resin, so that it can be attached even more firmly around the socket. become. Moreover, since the protrusion has its base in contact with the thicker inclined portion, it exhibits a strong resistance against tension toward the tube end. Moreover, since the protrusions are attached around the tube at intervals in the circumferential direction of the tube, the thread and the curable resin will strongly adhere to the outer surface of the socket in areas where the protrusions are not present. Therefore, the protrusion is firmly fixed. The protrusion is thus very firmly fixed around the socket. Since a plurality of such protrusions are provided, by directly engaging the locking tool with the protrusions, the spout can be reliably stopped so that it will not come off. In this respect, this invention has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a joint socket according to this invention. FIG. 2 is a perspective view of a protrusion that can be used in this invention. FIG. 3 is a side view showing the manufacturing process of the joint socket according to this invention. FIG. 4 is a partially cutaway perspective view of a known reinforced resin pipe joint. FIG. 5 is a partially cutaway side view of the reinforced resin pipe connection section. In the figure, 1 is an annular groove, 2 is a rubber ring, and 3
is an annular raised part, 4 is a pedestal of the protrusion, 5 is a locking part of the protrusion, 6 is a protrusion, 7 is a fiber or thread,
8 is a hardened resin.

Claims (1)

[Scope of utility model registration request] A tube socket made of reinforced resin, which has an annular groove extending in the circumferential direction on the inner surface of the tube, a rubber ring is fitted into the groove, and an inclined section on the outer surface that tapers toward the end of the tube. A plurality of protrusions made of a hard material having a pedestal and having a locking part erected on a part of the pedestal are arranged on the inclined part at intervals in the circumferential direction, and are passed over the pedestal and passed around the tube. A joint socket made of reinforced resin, in which fibers or threads are wound around a pipe, the fibers or threads are hardened with a curable resin capable of adhering to the resin, and the fibers or threads are integrated with a pipe.