JPH04107384A - Pipe having socket part - Google Patents

Abstract

PURPOSE:To prevent slip-off of a connecting pipe even when it is utilized as a crosscut pipe by integrally forming a connection pipe slip-off preventing means having a resilient contact piece brought into resilient contact with the outer peripheral surface of the connection pipe inserted in a manner to extend from the opening end side of a base part toward the radially oblique inside to prevent slip-off of the connection pipe. CONSTITUTION:A seal member 5 and a slip-off preventing means 6 are incorporated in a socket part 3. The slip-off preventing means 6 is provided with a base part 61 and a resilient piece 62. The base part 61 is formed in a shape extending along the inner wall surface of a socket part 3 running from a socket 32 to an expansion part 31, i.e., a trumpetform shape, and held in a manner to be nipped between the inner wall surface of the socket part 3 and a seal member 5. The resilient contact piece 62 is extended from the end part on the socket 32 side of the base part 61 to the oblique inside of a pipe body 2 in a manner to form a dogleg-shape in cross section based on the base part 61. The base part 61 of the slip-off preventing means 6 is formed in a tumpetform shape and locked to a wall surface running from the socket 32 of the socket part 3 to the expansion part 31. This constitution prevents the connection pipe 4 from slipping off by means of the slip-off preventing means 6.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a tube having a socket at at least one end of the tube.

[Conventional technology]

As a connection pipe with a socket for use in drainage pipes of buildings, there is a connection pipe proposed by the present applicant as disclosed in Japanese Patent Application Laid-Open No. 1-269789. This tube has an enlarged diameter socket, and its open end is narrowed to a diameter slightly larger than the outside diameter of the socket of the pipe to which it is connected, and is sealed inside the socket. It has a built-in member, and when the receptacle is inserted into the receptacle, the sealing member comes into close contact with the outer circumferential surface of the receptacle, creating a watertight connection between the two simply by insertion. ing. The sealing member interposed between the insertion opening and the insertion opening can be held securely. Furthermore, it has excellent advantages not found in conventional pipe joints, such as easy centering of the insertion port and reliable support for the insertion port.

[Problem to be solved by the invention]

By the way, when such pipes are connected in a substantially vertical manner, such as as a solid drainage pipe, by inserting the socket part from above, the pipe placed on the upper side It is prevented from coming off due to its own weight, but when used as a horizontal drainage pipe, the force that prevents it from coming out between the socket and the insertion port is the resistance between the seal member and the insertion port. Because only
The holding force may be weak, and there is a risk that it will come off if an external load or pressure inside the pipe increases. SUMMARY OF THE INVENTION In view of these circumstances, an object of the present invention is to provide a pipe having a novel socket that will not come off even when used as a horizontally drawn pipe.

[Means to solve the problem]

In order to achieve such an object, the present invention has the diameter of the end of the tube expanded to form a socket, and the open end of this socket has a diameter slightly larger than the outer diameter of the socket of the connecting pipe. A tube having a socket part which is constricted so that the socket part is constricted and has a sealing member built into the socket part for sealing in close contact with the outer circumferential surface of the socket part, a base part provided along the wall surface from the opening end of the part to the enlarged diameter part and sandwiched between the sealing member; The gist of the connecting tube wave, which includes an elastic contact piece that comes into elastic contact with the outer circumferential surface of the connecting tube to prevent the connecting tube from coming off, is a tube having a socket portion characterized by an integrated stop means.

[For production]

With the above configuration, when the insertion port of the pipe to be connected is inserted from the open end of the socket, it first comes into contact with the wall surface of the elastic piece. Then, when further force is applied, the elastic contact pieces are pushed outward and the insertion portion is inserted to a predetermined position deep inside the socket. The inserted tube is pressed against the outer wall surface of the elastic piece by the elastic force of the elastic piece.
It will be in a state where it is strongly gripped by the elastic contact piece.

【Example】

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Fig. 1 shows a half section of a first embodiment of the pipe having a socket according to the present invention when viewed from the side, and Fig. 2 shows a half cross section of the connected state of the connecting pipe when viewed from the side. It's raining. As shown in the figure, the pipe 1 having this socket part has a pipe main body 2.
A receptacle 3 is provided at one end. The socket part 3 is composed of an enlarged diameter part 31 whose diameter is larger than that of the pipe body 2, and a socket 32 which is narrowed to be slightly larger than the outer diameter of the insertion part 41 of the pipe 4 to be connected. There is. The inner diameter of the socket 32 is 2 to 4 mm larger than the outer diameter of the socket 41.
mm, that is, 1 to 2 mm around the entire circumference of the insertion port 41.
It is preferable to leave a gap of mm. Further, the wall surface from the enlarged diameter portion 31 to the socket 32 is bent in an arc shape, and the radius of curvature varies depending on conditions such as the outer diameter D1 of the tube body 2 and its wall thickness. D
When 1 is 100 mm, it is preferably about 25 mm in consideration of workability. Furthermore, the bending angle of the bending portion 34 in the tangential direction is 90
The angle is preferably smaller than 50°, particularly about 50 to 70°. The socket portion 3 has a sealing member 5 and a removal preventing means 6 built therein. The sealing member 5 is formed into a cylindrical shape from an elastic material such as synthetic rubber, and is integrated with the inner wall surface of the socket 3 using an adhesive or the like, and has tongues extending inward toward the socket 32. It is equipped with 51. The diameter of the tip of the tongue piece 51 is smaller than the outer diameter of the insertion port 41. The pull-out stopper 6 is made of a metal material such as, but not limited to, steel or stainless steel, for example.
It includes a base 61 and an elastic contact piece 62. The base portion 61 has a shape that follows the inner wall surface of the socket portion 3 from the socket portion 32 to the enlarged diameter portion 31, that is, a trumpet shape, and has a shape that extends between the inner wall surface of the socket portion 3 and the sealing member 5. It is held in such a way that it is sandwiched between. The elastic contact piece 62 has a cross-sectional shape of a dogleg shape with the base 61.
It extends diagonally inward of the tube body 2 from the end of the base 61 on the side of the socket 32, and its tip is narrower than the outer diameter of the insertion port 41 in a no-load state. Further, the elastic contact piece 62 is provided with radial notches 62a. The tube body 2 may be a metal tube made of steel, copper, aluminum, etc., a thermoplastic resin tube, a composite tube in which a metal tube is coated with a thermoplastic resin, or the like. The pipe 1 having this socket part is manufactured, for example, by the following method, although it is not particularly limited. First, a tube with constant outer and inner diameters is prepared, and one end of this tube is enlarged by secondary processing to form the enlarged diameter portion 31 . Next, after the sealing member 5 and the retaining means 6 are installed in the enlarged diameter part 31, the opening end of the enlarged diameter part 31 is formed into a throttle socket 32. Note that it is preferable that the sealing member 5 and the removal preventing means 6 are bonded to the inner wall surface of the enlarged diameter portion 31 via an adhesive or the like at the same time as the interior. Methods for expanding the diameter of the tube vary depending on the material of the tube, and include, for example, bulge processing, spatula processing, expand processing, and the like. Incidentally, bulge processing involves fitting an elastic body having an outer diameter approximately equal to the inner diameter of the tube to the end of a tube with constant inner and outer diameters, and also fitting an elastic body to the end of the tube to form an expansion. An outer mold corresponding to the shape of the diameter portion 31 is fitted, and in this state it is expanded in the radial direction to enlarge the diameter of the tube end portion. The pipe 1 having this socket part is as described above,
When the insertion part 41 of the pipe 4 to be connected from the socket 32 is inserted,
The tip of the inserted insertion port 41 first hits the side wall surface 62b of the elastic contact piece 62 of the removal preventing means 6. However, since the elastic contact piece 62 is divided into small pieces by the notch 62a, it easily bends outward. Therefore, if the force continues to be applied, the insertion port 41 will be inserted even deeper. Finally, the insertion part 41 is attached to the back wall 5a of the sealing member 5.
It can be inserted until the end surface of the Since the tongue piece 51 of the seal member 5 has a smaller diameter than the outer diameter of the insertion part 41, first, the outer peripheral surface of the insertion part 4■ and the inner peripheral surface of the tongue piece 51 come into contact with each other, and the insertion part 41 is inserted further back, the inner circumferential surface of the tongue piece 51 comes into close contact with the outer circumferential surface of the insertion part 41 and enters into the inner part of the socket part 3 together with the insertion part 41, so that the tip of the sealing member 5 The parts become pulled together. Therefore, the outer circumferential surface of the insertion port 41 and the inner circumferential surface of the tongue piece 51 are in close contact over a wide area, and the connecting tubes are connected in a completely watertight state. When the tube is connected by inserting the insertion port 41 into the socket 3 as described above, when a force in the direction of removal is applied to the connected tube 4, the elastic contact piece 62 moves into the insertion port 41. Since the connecting pipe 4 is pressed against the outer circumferential surface, the connecting pipe 4 tends to come out together with the retaining means 6. However, the base 61 of the pull-out stopper 6 is shaped like a trumpet tube, and is locked to the wall surface of the socket 3 from the socket 32 to the enlarged diameter part 31. Therefore, the connecting pipe 4 can be securely prevented from being removed by the removal preventing means 6. FIG. 3 is a half cross-sectional side view of a second embodiment of the pull-out stopper used in a pipe having a socket according to the present invention. As shown in the figure, the removal preventing means 7 is the same as the first embodiment except that a protrusion 73 is provided on the inner circumferential surface of the elastic contact piece 72. In the case of this embodiment, since the elastic force of the elastic contact piece 72 is concentrated at the tip of the protrusion 73, the protrusion 73 acts to bite into the outer circumferential surface of the inserted insertion port 41, and a large pulling force is exerted. I can demonstrate my abilities. In addition, in the figure, 71 is a base, and 72a is a notch. FIG. 4 is a half cross-sectional side view of a third embodiment of the pull-out stopper used in a pipe having a socket according to the present invention. As shown in the figure, the removal stop means 8 is the same as the first embodiment except that the elastic contact piece 82 is curved so as to be convex to the outside. In this way, the edge portion 83 of the elastic contact piece 82 acts to bite into the outer wall surface of the tube when a force is applied in the direction of the tube being pulled out, and exerts a large force to prevent the tube from being pulled out. In addition, in the figure, 81 is a base, and 82a is a notch. The pipe having a socket according to the present invention is not limited to the above embodiments. For example, in the above embodiment, the base of the removal stop means is shaped like a trumpet tube, but the base may also be provided with a notch. In addition, in the above embodiment, the seal member was provided with a tongue piece, but this tongue piece is eliminated and a cylindrical seal member whose inner diameter is slightly smaller than the outer diameter of the insertion part is used. I don't mind.

【Effect of the invention】

Since the pipe having the socket according to the present invention is constructed as described above, the connecting pipe can be easily connected in a watertight state by simply inserting the socket of the connecting pipe into the socket. Of course, the disconnection preventing means can prevent the force in the disconnection direction from being received, so that the connection cannot be easily released. Therefore, even when used as a horizontal drawing pipe, it can be used with peace of mind without falling out.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of a first embodiment of a pipe having a socket according to the present invention, and FIG. 2 is a half-sectional view of a pipe to be connected with the socket inserted. , FIG. 3 is a half-sectional view showing a second embodiment of the pull-out stopper used in a pipe having a socket according to the present invention, and FIG. FIG. 3 is a half-sectional view of a third embodiment of the pull-out stop means used; 1... Pipe having a socket 2... Pipe body 3...
Socket portion 4... Connection pipe 5... Seal member 6.
7. 8... Removal preventing means 31... Expanded diameter part 32
... Socket (opening end) 41 ... Socket part 61. 7
1. 81... Base 62.72.82... Elastic contact piece. Patent applicant: Sekisui Chemical Co., Ltd.

Claims (1)

[Claims] (1) The diameter of the end of the pipe is expanded to form a socket, and the open end of the socket is narrowed to have a diameter slightly larger than the outer diameter of the socket of the connecting pipe, and The pipe has a socket inside the socket, which has a built-in sealing member that tightly seals the outer peripheral surface of the socket, and a wall surface extending from the open end of the socket to the enlarged diameter part. and a base provided to be sandwiched between the sealing member and the outer circumferential surface of the connecting pipe extending obliquely inward in the radial direction from the open end side of the base to elastically contact the outer peripheral surface of the connecting pipe. 1. A tube having a socket portion, characterized in that a connecting tube slip-off preventing means is integrated with a connecting tube slip-off prevention means provided with an elastic contact piece for preventing slip-off.