JPS6259658B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a pipe with a socket, in which a socket is later formed at the end of the pipe body.

(Prior Art) Conventionally, when forming a socket at the end of a pipe later, for example, as in Japanese Patent Publication No. 52-50069, an inner mold is fitted inside the end of the pipe and a bell part is formed. An outer mold wrapped with is placed on the outer periphery of the pipe, and an elastic packing member coated with adhesive on both or one side is provided in the gap between the outer surface of the pipe and the inner surface of the small diameter portion of the bell portion, or an elastic packing member is used together with the packing member. Alternatively, these may be joined with resin-impregnated glass fibers interposed therebetween.

Furthermore, Japanese Patent Application Laid-Open No. 51-132283 discloses that the outer periphery of the end of a flexible tube made of glass fiber impregnated with resin is reduced in diameter using a tightening jig, and a rubber gasket is fitted and bonded to the part. In this state, a core metal is brought into contact with the part, a resin-impregnated glass fiber is wrapped around the outer periphery of the core metal and the rubber packing to form a socket, and after curing, the tightening jig and core metal are removed to compress it. A method is described for forming a receptacle in which a rubber gasket is embedded.

(Problems to be Solved by the Invention) However, the former method has the disadvantage that the work of inserting the packing into the narrow gap between the outer surface of the pipe and the inner surface of the bell portion is complicated.

Furthermore, if the latter method is applied to non-flexible pipes, there is a risk of cracking at the end of the pipe during the diameter reduction process using the tightening jig, and since the socket part is not manufactured in advance, The disadvantage was that it was complicated.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above-mentioned drawbacks of the prior art, and its gist is that the outer circumferential surface of the end of the tube is A short tube for forming a socket, which has a first elastic cylindrical body having an inclined surface whose outer diameter gradually decreases toward the edge of the body, and has an inner diameter larger than the outer diameter of the tube body. The inner peripheral surface of one end has an inclined surface whose inner diameter gradually increases toward the edge of the short tube, and when the elastic cylinder and the inclined surfaces are brought into contact with each other and overlapped, fixing a second elastic cylindrical body having a thickness greater than the gap between the tube body and the short pipe for forming a socket;
The end of the tube is inserted into one end of the short tube, and the first
A method for manufacturing a pipe with a socket, characterized in that the sloped surface of the second elastic cylinder is press-fitted into the sloped surface of the second elastic cylinder so that both sides are joined in a compressed state. Exists.

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

1 to 3 are front views illustrating the steps of an embodiment of the present invention, and FIG. 4 is a perspective view of a pipe with a socket manufactured according to an embodiment of the present invention.

1 is a tube made of fiber-reinforced resin or the like. still,
The tube body 1 may have an intermediate layer made of resin concrete or the like provided between inner and outer reinforcing layers made of fiber-reinforced resin or the like.

2 is a first elastic cylinder whose inner diameter is the same as that of tube 1.
The outer diameter is approximately the same as the outer diameter of the outer diameter, and the outer surface thereof is an inclined surface 21 whose outer diameter gradually decreases from one end to the other end.

Reference numeral 3 denotes a short tube for forming a socket having an inner diameter larger than the outer diameter of the tube body 1, and is made of the same or different material as the tube body 1.

4 is a second elastic cylinder whose outer diameter is the same as that of the short tube 3.
The inner diameter is approximately the same as the inner diameter of the inner diameter, and the inner diameter thereof is an inclined surface 41 whose inner diameter gradually increases from one end to the other end. The thickness of the first elastic cylindrical body and the second elastic cylindrical body is such that the thickness of the first elastic cylindrical body and the second elastic cylindrical body is the sum of the thickness when they are stacked with their inclined surfaces in contact with each other, which is greater than the gap between the tube body 1 and the short tube 3. It is necessary to make sure that it is also large.

Reference numeral 5 denotes a core mold for supporting the short tube, and an insertion mold 5 having an outer diameter approximately equal to the inner diameter of the short tube 3 is provided on one surface of the substrate 51.
2 is provided, and rings 53, 53 are provided on the sides of the insertion mold 52 of the board 51.

Reference numeral 6 denotes a locking tool, in which projecting edges 62, 62 are provided on the outer edge of the split ring body 61, and fasteners 63, 63 are attached to the projecting edges 62, 62. 6
3, the split ring body 61 can be locked to the tube body 1,
Rings 64, 64 are attached to the protruding edges 62, 62.

7, 7 is a spring body, the ring 53 of the core type 5,
53 and the rings 64, 64 of the locking tool 6 and used to pull them together.

A first elastic cylinder 2 is placed on the outer peripheral surface of the end of the tube 1.
The inclined surface 21 is fixed with adhesive toward the edge of the tube 1, and the locking tool 6 is locked to a portion of the tube 1 adjacent to the portion to which the first elastic cylinder 2 is fixed (first (see figure). On the other hand, the second elastic cylinder 4 is fixed to the inner circumferential surface of one end of the short tube 3 with adhesive, with the inclined surface 41 facing the edge of the short tube 3, and the other end of the short tube 3 is placed on the floor. Insert it into the insertion mold 52 of the core mold 5 that has been placed (see Fig. 2). Apply adhesive on the inclined surface 21 of the first elastic cylinder 2 and the inclined surface 41 of the second elastic cylinder 4, and before the adhesive hardens, attach the end of the tube 1 to the short tube 3.
The inclined surface 21 of the first elastic cylinder 2 is located within one end of the
is pressed into the inclined surface 41 of the second elastic cylinder 4 in a sliding manner, and the spring bodies 7, 7 are hooked between the rings 53, 53 of the core mold 5 and the rings 64, 64 of the locking tool 6. , fix both by pulling them, and
The inclined surface 21 of the second elastic cylinder 2 and the inclined surface 41 of the second elastic cylinder 4 are joined (see FIG. 3). After that, the spring bodies 7, 7 are removed, the locking tool 6 is removed, and the core mold 5 is removed to form a socket with an elastic cylinder interposed between the end of the tube 1 and one end of the short tube 2. Obtain the attachment tube (see Figure 4).

(Effects of the Invention) Since the method for manufacturing a pipe with a socket according to the present invention is configured as described above, elasticity in a compressed state is generated in the narrow gap between the end of the pipe body and one end of the short pipe for forming a socket. The cylinder can be easily interposed without requiring a large amount of adhesive.

[Brief explanation of the drawing]

1 to 3 are front views illustrating the steps of an embodiment of the present invention, and FIG. 4 is a perspective view of a pipe with a socket manufactured according to an embodiment of the present invention. Explanation of symbols: 1... Tube body, 2... First elastic cylinder body, 3... Short tube, 4... Second elastic cylinder body, 21,
41...Slope surface.

Claims (1)

[Claims] 1. A first elastic cylinder having an inclined surface whose outer diameter gradually decreases toward the edge of the tube is fixed to the outer peripheral surface of the end of the tube, and the outer diameter of the tube is smaller than the outer diameter of the tube. a short pipe for forming a socket having a large inner diameter, the inner circumferential surface of one end of the short pipe has an inclined surface whose inner diameter gradually increases toward the end edge of the short pipe; and the elastic cylinder and the inclined surface thereof. A second elastic cylindrical body whose thickness is larger than the gap between the tube body and the short pipe for forming a socket when they are brought into contact with each other and overlapped is fixed, and the end of the tube body is is press-fitted into one end of the short tube by sliding the inclined surface of the first elastic cylinder onto the inclined surface of the second elastic cylinder,
A method for manufacturing a pipe with a socket, characterized by joining both sides in a compressed state.