JP2001241578A - Pipe grip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe grip which is possible to prevent an entry from being slipped away after the entry has been inserted into the expanded pipe grip and to conduct a pipe connection without forcefully holding the state of insertion. SOLUTION: A PVC pipe with the pipe grip at one end having a grip inner surface expanding toward an open end wherein a larger diameter section 12 is arranged at an inner deep of the inside of the grip 11 and an inside diameter of the larger diameter section 12 at the open end side is made smaller than an outside diameter of the entry 10 of the PVC pipe to be adhesively connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an adhesive type pipe socket.

[0002]

2. Description of the Related Art Conventionally, for example, a hard vinyl chloride resin pipe (hereinafter simply referred to as PVC pipe) is used as a sewer pipe, a water pipe, or a cable protection pipe such as a power cable or a communication cable. At this time, a TS port is formed by heating and expanding the diameter at one end of the PVC pipe. Then, after applying an adhesive to the inside of the TS receptacle, the adjacent PVC
Insert the spigot at the other end of the tube, swell the adhesive and PVC
Adhesive connection is made by the elasticity of the tube (see FIG. 5).

[0003]

However, in the case of the above-mentioned conventional PVC pipe 1, the socket 1 into which the spigot 10 is inserted.
Since the inner surface of 1 is a tapered surface 11a that expands outwardly, fluidization of the bonding surface occurs immediately after the spigot 10 is inserted, and the taper of the inner surface of the receiving port 10 causes the spigot 10 to come out (return). Will be.

[0004] Therefore, after inserting the slot in the receptacle,
The inserted state must be held for a predetermined time period of about 60 seconds until an initial adhesive force exceeding the above-mentioned exit force is obtained. The holding time varies depending on the diameter of the PVC pipe and the type of the adhesive, but is usually 30 seconds to 100 seconds. As described above, since the waiting time is required, the connection work is time-consuming, and the burden on the construction worker is great.

[0005] An object of the present invention is to insert a spigot into a receptacle,
An object of the present invention is to provide a pipe socket which can be connected to a pipe without causing the outlet to come off and maintaining an inserted state.

[0006]

According to a first aspect of the present invention, there is provided a pipe socket having a receiving inner surface which extends toward an open end at one end, and a diameter increasing portion is provided at a deep portion of the receiving inner surface. The inner diameter at the opening end side of the enlarged diameter portion is smaller than the outer diameter of the spliced resin pipe, and the maximum inner diameter of the enlarged diameter portion is the spliced outer diameter of the resin tube. It is located in the pipe port whose diameter is almost the same as the diameter.

(Function) In the pipe receiving port according to the present invention, the inner diameter at the opening end side of the enlarged diameter portion provided at the back of the inner surface of the receiving port is larger than the outer diameter of the spigot of the resin pipe to be bonded and connected. And the maximum inside diameter of the enlarged portion is almost the same as the outside diameter of the resin tube, so that the resin tube that is adhesively connected to the socket immediately after insertion is inserted. Can be prevented.

In addition, since the inner diameter at the opening end side of the enlarged diameter portion is smaller than the outer diameter of the spigot of the resin pipe to be bonded and connected, the bonding strength of the connection portion is improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of the pipe socket of the present invention.

In FIG. 1, reference numeral 1 denotes a PVC pipe having an outer diameter (D) of 60 mm, an inner diameter of 56 mm, and a wall thickness of 2 mm.
VU50. One end of the PVC pipe 1 is an enlarged diameter receiving port 11.
The other end is a port 10. Enlarged port 11
Is composed of a first enlarged diameter portion 13 having an inner surface that expands in a tapered shape toward the opening end side, and a second enlarged diameter portion 12 located deeper than the enlarged diameter portion 13.

The inner surface of the first enlarged diameter portion 13 has a gradually tapered surface 13a toward the opening end. The inner surface of the second enlarged diameter portion 12 has a steeply tapered surface 12a, a horizontal surface 12b, and a gently tapered surface 12c.

The minimum inner diameter of the first enlarged diameter portion 13 is smaller than the outer diameter of the spigot 10 of the PVC pipe 1 to be connected, preferably smaller than the minimum outer diameter. In this case, the maximum inner diameter (A) of the first enlarged diameter portion 13 is 60.8 mm, and the minimum inner diameter (B) is 5 mm.
It is 9.6 mm. Thus, the first enlarged diameter portion 1
By setting the minimum inner diameter of 3 to be smaller than the outer diameter of the spigot 10, excellent adhesive strength can be obtained.

The second enlarged diameter portion 12 has an annular bulge having a substantially trapezoidal cross section. The maximum inner diameter of the annular bulge is equal to the outer diameter of the spigot 10 of the PVC pipe 1 to be connected. The diameter is substantially the same or larger than the outer diameter. In this case, the maximum inner diameter (C) of the second enlarged diameter portion 12 is 60.1 mm, and the minimum inner diameter is 56 mm.

Next, a method of forming an enlarged diameter receiving port at one end of the PVC pipe 1 will be described. FIG. 2 is a sectional view showing a mold 2 for forming the enlarged diameter receiving port 11 of FIG. The mold 2 includes a front mold 21, a rear mold 23, and an intermediate mold 22 located between the two molds. A part of the rear mold 23 is supported by the fixing member 4. I have. The fixing member 4 is supported by a cylinder or the like (not shown) so as to be movable in the front-rear direction.

The front mold 21 has a tapered portion 21a and a horizontal portion 2
1b. The horizontal portion 21b has a function as a guide portion, and has an outer diameter of P
The diameter is slightly smaller than the inner diameter of the VC tube 1. And
Since the tapered portion 21a is provided at the front end of the front mold 21, insertion of the heated end of the PVC pipe 1 can be smoothly performed.

The intermediate mold 22 has a steeply tapered portion 22.
a, a horizontal portion 22b and a gentle taper portion 22c. The rear mold 23 has a gradually tapered portion 23a toward the rear end. Reference numeral 3 denotes a ring body for removing the enlarged diameter receiving port from the mold 2 after forming the enlarged diameter receiving port. The ring body 3 is supported by a plurality of support rods 31 and arranged on the rear end side of the rear mold 23. ing.

When the end of the preheated PVC pipe 1 is inserted from the front mold 21 side, this end is inserted into the middle mold 22.
The diameter is increased through the steeply tapered portion 22a, and reaches the rear mold 23 through the horizontal portion 22b and the gradually tapered portion 22c. The tapered portion 23a of the rear mold 23 and the tapered portion 22a, the horizontal portion 22b, and the tapered portion 22c of the intermediate mold 22 are formed into a final shape. Then, after cooling and solidifying the end of the enlarged diameter receiving port of the PVC pipe 1 formed into the final shape, the fixing member 4 is moved backward by a cylinder or the like, and the ring By pressing the end face and removing the mold 2 from the enlarged diameter receiving port,
A PVC pipe 1 with an enlarged diameter receiving port shown in FIG. 1 is obtained.

Next, a description will be given of a method of connecting the PVC pipes 1 with the enlarged diameter receiving port. First, one PVC pipe 1
An adhesive is applied to the inner surfaces of the first and second enlarged diameter portions 12 and 13 by using a brush, and the other PV to be connected is connected.
An adhesive is also applied to the outer surface of the spigot 10 of the C tube 1. After applying the adhesive, the spigot 10 of the other PVC pipe 1 is inserted into the enlarged diameter receiving port 11 of one PVC pipe 1 by about 35 mm.

In this case, the inner surface of the enlarged diameter receiving port 11 is formed as a gentle tapered surface 12c having a reverse taper and a gentle taper surface 12c following the gentle tapered surface 13a of the first enlarged diameter portion 13.
The distal end of the inserted spigot 10 is temporarily reduced in diameter when passing through the minimum inner diameter portion of the first enlarged diameter portion 13 and is restored to the original outer diameter. For this reason, as shown in FIG. 3, since the outer surface of the distal end portion of the spigot 10 abuts and locks on the tapered surface 12 c of the second enlarged diameter portion 12, no ejection force is generated in the spigot 10. Therefore, after inserting the spigot 10 into the enlarged-diameter receiving port 11, both P
It is not necessary to keep the VC pipes 1, 1 until the initial adhesive strength is developed, and the pipe connection time can be shortened.

The tapered surface 12 of the second enlarged diameter portion 12
Since c has a gentle slope, the bonding area substantially increases. As a result, the bonding strength of the connection part increases.

In the first embodiment shown in FIG. 1, the tapered surface 12c of the second enlarged diameter portion 12 following the tapered surface 13a of the first enlarged diameter portion 13 is made gentle, but as shown in FIG. The slope may be a tapered surface 12c. In this way, the steep tapered surface 12c further enhances the effect of preventing the outlet 10 from being pulled out.

[0022]

According to the first aspect of the present invention, the inner diameter at the opening end side of the enlarged diameter portion provided at the back of the inner surface of the receiving port is made smaller than the outer diameter of the spigot of the resin pipe to be bonded and connected. In addition, since the maximum inner diameter of the enlarged diameter portion is substantially the same as the outer diameter of the spout of the resin tube, it is possible to prevent the spout of the resin tube that is adhesively connected to the receptacle. Therefore, there is no need to wait for the insertion state to be maintained until the initial adhesive strength is obtained, and the number of steps required for pipe connection can be reduced.

Further, since the inner diameter at the opening end side of the enlarged diameter portion is smaller than the outer diameter of the inlet of the resin pipe to be bonded and connected, the bonding strength of the connection portion is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a pipe socket structure of the present invention.

FIG. 2 is a cross-sectional view showing a mold for forming the receiving port of FIG. 1;

FIG. 3 is a longitudinal sectional view showing a connection state of the pipe with a receiving port of FIG. 1;

FIG. 4 is a longitudinal sectional view showing a modification of FIG.

FIG. 5 is a longitudinal sectional view showing a connection state of a conventional pipe with a TS port.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hard vinyl chloride resin pipe 10 Spout 11 Enlarged diameter receiving port 12 Second enlarged diameter portion 12a, 12c Tapered surface 12b Horizontal plane 13 First enlarged diameter portion 13a Gentle taper surface 2 Mold 3 Ring body 4 Fixing member

Claims (1)

[Claims] 1. A pipe socket having an inner surface on one end that extends toward an open end, wherein an enlarged diameter portion is provided in a deep portion of the inner surface of the opening, and an enlarged diameter portion is provided on the open end side of the enlarged diameter portion. It is characterized in that the inner diameter is smaller than the outer diameter of the spigot of the resin pipe to be bonded and connected, and the maximum inner diameter of the enlarged diameter portion is substantially the same as the outer diameter of the spigot of the resin pipe to be bonded and connected. Pipe outlet to be used.