JPH04107386A - Pipe coupling - Google Patents

Abstract

PURPOSE:To prevent slip-off of a connection pipe even when the connection pipe is utilized as a crosscut pipe by integrally forming a slip-off preventing means having an annular lock means, and a connection pipe tightening part reduced in size by a size reduction means and tightening the desired part of the outer peripheral surface of the connection pipe. CONSTITUTION:In a slip-off preventing means 6, a filament material is molded in a saddleform manner, and a first annular part 63 forming a lock part and a second annular part 64 forming a tightening part are intercoupled through two parallel pieces 61 and 62 forming a connection part. The slip-off preventing means 6 is provided with protrusion pieces 67 and 68, serving as a size reduction means 6a, and a screw 8. When a pipe coupling 1 connected to a connection pipe 4, when a force in a slip-off direction is exerted on the connection pipe 4, the outer peripheral surface of the connection pipe 4 is tightened by means of the second annular part 64, whereby the connection pipe 4 is about to slip off togetherwith the slip-off preventing means 6. However, since the first annular part 63 of the slip-off preventing means 6 is locked to the neck part of an expanded part 31, the lock prevents slip-off of the connection pipe 4.

Description

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

The present invention relates to a pipe joint.

[Conventional technology]

As a pipe joint used for drainage pipes in buildings, there is a joint proposed by the present applicant, as disclosed in Japanese Patent Laid-Open No. L-269789. This pipe joint has an enlarged diameter socket, and its opening end is narrowed to a diameter slightly larger than the outside diameter of the socket of the pipe to be connected. It has a built-in sealing 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, and the two are connected watertight just by insertion. It has become. 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, such pipe joints can be used as drainage hard pipes, etc.
If the socket is inserted from above and connected in a substantially vertical manner, the weight of the pipe placed at the top will prevent it from coming off, but if the When used as a pull pipe, the retaining force between the socket part and the insertion part is only the resistance between the sealing member and the insertion part, so the holding force may be weak, and the external There is a risk that it will come off if the load from the pipe or the pressure inside the pipe increases. In view of these circumstances, an object of the present invention is to provide a new pipe joint that will not come off even when used as a side-drawn pipe.

[Means to solve the problem]

In order to achieve such an object, the present invention has a socket whose diameter is larger than that of the pipe joint body, and the opening end of this socket has a diameter slightly larger than the outer diameter of the insertion part of the connecting pipe. The pipe fitting has a sealing member built-in inside the socket part to closely seal the outer circumferential surface of the socket part, and is fitted into the pipe joint main body and The outer periphery of the connecting pipe is supported by a substantially ring-shaped locking portion having a smaller diameter than the enlarged diameter portion and a connecting portion extending from the locking portion toward the opening end, and is reduced in diameter by a diameter reducing means. The gist of the present invention is a pipe joint characterized in that a slip-off prevention means is integrated with a connecting pipe tightening portion that can freely tighten a desired portion of the surface.

[For I]

With the above configuration, first, with the diameter reducing means loosened and the tightening part released, the insertion part of the pipe to be connected is inserted to a predetermined position in the socket part. By this insertion, the sealing member comes into close contact with the outer peripheral surface of the insertion port,
The connecting pipes are connected in a watertight manner. After insertion, the diameter of the tightening portion is reduced by the diameter reducing means, and the portion of the connecting pipe protruding from the socket portion is tightened by the tightening portion. That is, by this tightening, the inner circumferential surface of the tightening portion is pressed against the outer circumferential surface of the connecting tube, so that the retaining means and the connecting tube are integrated. Therefore, when a force is applied to the connecting pipe in the direction in which it comes out from the socket, the retaining means also tends to move in the direction in which it comes out. However, the locking portion is locked to the enlarged diameter portion, and this locking prevents the connecting pipe from coming off.

【Example】

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a half cross-sectional side view of a first embodiment of the pipe joint according to the present invention, and FIG. 2 is a plan view showing the state in which the connecting pipes are connected. As shown in the figure, this pipe joint 1 is provided with a socket portion 3 at one end of a pipe joint main body 2. The socket part 3 is composed of an enlarged diameter part 31 whose diameter is larger than that of the pipe joint 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. ing. 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 is the outer diameter D of the pipe joint body 2.
1 and its wall thickness, but for example, if the outer diameter D1 is 100 mm, it is 25 mm considering workability.
degree is preferred. 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°. A sealing member 5 is built into the socket portion 3 . The sealing member 5 is formed into a cylindrical shape from an elastic material such as synthetic rubber, and has a tongue piece 5 extending inwardly toward the socket 32 side.
1. The diameter of the tip of the tongue piece 51 is smaller than the outer diameter of the insertion port 41. As shown in FIG. 3, the retaining means 6 is made of a ring-shaped wire material shaped into a saddle shape, and has a third member, which serves as a locking portion, via two parallel pieces 61 and 62, which serve as connecting portions. 1 annular portion 63
and a second annular portion 64 serving as a tightening portion are connected to each other. The first annular portion 63 is configured such that the two parallel pieces 61 and 62 are pushed apart to the left and right so that the pipe joint body 2 is fitted into the first annular portion 63, and the first annular portion 63 side of one of the parallel pieces 61 is The tip of the hook 66 rotatably provided on the other parallel piece 62
It is designed to be attached to the pipe joint body 2 by hooking it on the pipe joint body 2. Furthermore, it can be removed again by removing the hook 66 and pushing the parallel pieces 61 and 62 apart to the left and right. The retaining means 6 includes a protruding piece 67 as a diameter reducing means 6a.
．． 68 and screw 8 are provided. The protruding pieces 67 and 68 are provided so as to protrude so as to face the ends of the parallel pieces 61 and 62 on the second annular part 64 side, respectively, and
One of the protruding pieces 67 has a screw hole 67a, and the other protruding piece 68 has a screw hole 68a into which the screw 8 is screwed.
is drilled. Note that the retaining means 6 is preferably made of a metal material such as, but not limited to, steel, stainless steel, brass, or the like. Although this pipe joint 1 is not particularly limited, the parts other than the locking means 6 are manufactured, for example, by the following method. 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 is installed inside the enlarged diameter portion 31, the opening end of the enlarged diameter portion 31 is formed into a throttle socket 32. Note that it is preferable that the seal member 5 is 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. This pipe joint 1 is constructed as described above and is used in the following manner. That is, first, the second annular portion 6 is loosened by loosening the diameter reducing means 6a.
4 is expanded or freely expanded, the insertion part 41 is exposed from the inside of the second annular part 64 to the inside of the socket part 3, and is inserted until it finally hits the back wall 5a of the sealing member 5. do. When the insertion part 41 is inserted into the socket part 3, 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 circumferential surface of the insertion port 41 and the inner circumferential surface of the tongue piece 51 abut,
The socket 41 is inserted further into the back, the inner peripheral surface of the tongue 51 comes into close contact with the outer peripheral surface of the socket 41, and the tongue 51 enters deep into the socket 3 together with the socket 41, and the tip of the tongue 51 will be 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 tube 4 is connected in a completely watertight state. After inserting the socket part 41 into the socket part 3 and constructing the piping, insert the screw 8 inserted into the screw hole 67a into the screw hole 68.
By screwing into the second annular portion 64 and reducing the diameter of the second annular portion 64, the outer circumferential surface of the portion of the connecting pipe 4 protruding from the socket portion 3 is tightened. By this tightening, the inner circumferential surface of the second annular portion 64 comes into pressure contact with the outer circumferential surface of the connecting tube 4, so that the retaining means 6 is fixed to the connecting tube 4. Therefore, when this pipe joint 1 is connected to the connecting pipe 4 as described above, when a force in the direction of withdrawal is applied to the connecting pipe 4, the outer peripheral surface of the connecting pipe 4 is tightened by the second annular portion 64. Therefore, the connecting pipe 4 tends to come off together with the retaining means 6. However, the first annular portion 6 of the retaining means 6
3 is locked to the neck portion of the enlarged diameter portion 31, this locking prevents the connecting pipe 4 from coming off. The pipe joint according to the present invention is not limited to the above embodiments. For example, in the above embodiment, the slip-off preventing means is formed of a wire material, but at least the tightening portion may be formed of a band material. When a band material is used, projections or ridges can be provided on the surface of the connecting tube side to improve the frictional force between the connecting tube and the tightening portion, thereby increasing the retaining effect. In addition, in the above embodiment, the retaining means is detachable, but the locking part may be attached to the pipe fitting body in advance, and instead of a hook, it can be locked with a screw like the tightening part. The portion may be made smaller in diameter. Furthermore, in the above embodiment, rather than tightening the screw, one protrusion is attracted to the other protrusion to reduce the diameter of the tightening part. Other diameter reduction methods, such as providing a clamp on the opening end and operating the clamp by hooking the clamp onto a protrusion provided on the other opening end, and pulling the other opening end toward the one opening end to reduce the diameter. The diameter may be reduced using other means. In the above embodiment, the seal member was provided with a tongue piece, but it is also possible to eliminate this tongue piece and use a cylindrical seal member whose inner diameter is slightly smaller than the outer diameter of the insertion part. I do not care.

【Effect of the invention】

Since the pipe joint according to the present invention is configured as described above, it is possible to easily connect the connecting pipe in a watertight state by inserting the insertion part of the connecting pipe into the socket part, and also to easily tighten it. By performing this work, the force in the pulling direction can be stopped by the slip-off preventing means, 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 drawings]

Fig. 1 is a half-sectional view of the first embodiment of the pipe joint according to the present invention, Fig. 2 is a plan view showing the state in which the insertion part of the pipe to be connected is inserted, and Fig. 3 is FIG. 3 is a perspective view of the retaining means. l... Pipe fitting 2... Pipe fitting body 3... Socket part 4... Connecting pipe End... Seal member 6... Retaining means 41... Socket part 61.62...・Parallel piece (connection part) 63...First annular part (locking part) 64...Second annular part (tightening part) 6a...Applicant for patent for diameter reduction means Sekisui Chemical Co., Ltd. Book No. 1

Claims (1)

[Claims] (1) The diameter of the socket is larger than that of the pipe fitting body, and the opening end of this socket is narrowed to a diameter slightly larger than the outer diameter of the insertion part of the connecting pipe, and The pipe fitting has a built-in sealing member that tightly seals against the outer circumferential surface of the insertion part, and the pipe fitting has a substantially ring shape that is inserted into the pipe joint body and has a smaller diameter than the enlarged diameter part. A connecting tube tightening member supported by a locking portion and a connecting portion extending from the locking portion toward the opening end, and whose diameter is reduced by a diameter reducing means to tighten a desired portion of the outer circumferential surface of the connecting tube. A pipe joint characterized in that a retaining means having a part and a retaining means are integrated.