JPH0680988U - Universal joint for pipe connection - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a universal joint for pipe connection that can easily cope with subtle bending and site alignment and is low cost. [Structure] An outer tube portion 1 formed by drawing an arc so that a cross section of an inner surface is a partially notched circle, flat plate portions 2 and 3 extending from each notched portion of the outer tube portion 1, and the outer side. Pipe 1
An annular packing 4 mounted on the inner surface of the inner ring 5, an inner tube portion 5 slidably fitted in the annular packing 4, and a support arm 6 provided on a side wall of the inner tube portion 5 are provided. The arm 6 is pivotally supported between the flat plate portions 2 and 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a universal joint capable of connecting two pipes at any angle.

[0002]

[Prior art]

 Conventionally, when connecting two pipes at an angle, a bender directly bends the pipes or connects them through a joint bent at a predetermined angle in advance.

5 and 6 show a conventional joint. In this, two press plates 10 and 11 each having a semicircular portion 14 for sandwiching a pipe to be connected from both sides are fastened with bolts 12 and nuts 13. The semi-circular portions 14 that sandwich the pipes have an angle of 90 degrees with each other so that two pipes can be connected at an angle of 90.

[0004]

[Problems to be solved by the device]

 However, the conventional method described above has problems in the former and the latter. In other words, the method of directly bending and connecting the pipe with a bender is not so difficult as in the case of a thin pipe with a diameter of 25φ or less, but it is hard as a gas pipe (carbon steel pipe for piping) or comparatively soft. Even for ERW pipes (carbon steel pipes for machine structures), if the diameter exceeds 38φ, the bending angle will be restricted to around 30 degrees, making it difficult to process.

Further, in the latter case where the joint is used, the angle cannot be set to a desired one because there is no choice but to select from among those having a predetermined angle. For example, when a complicated bend is required, such as the “Z” shape like the route R shown by the one-dot chain line in FIG. 7, a large number of joints are required and the bend of the pipe itself is required. Is coming.

In any case, there is a problem that it is not possible to deal with a subtle bend and on-site alignment, and it is necessary to adjust the angle to a desired angle by trial and error. The present invention has been made in view of the above-mentioned matters, and it is a technical object to provide a universal joint for pipe connection which can easily cope with delicate bending and site alignment and is low in cost.

[0007]

[Means for Solving the Problems]

 The present invention has the following configuration in order to solve the above technical problems. That is, the outer tube portion 1 formed by drawing an arc so that the inner surface has a partially cut-out circle, the flat plate portions 2 and 3 extending from the respective notched portions of the outer tube portion 1, and the outer tube portion. An annular packing 4 mounted on the inner surface of the portion 1, an inner pipe portion 5 that is internally slidably fitted in the annular packing 4, and a support arm 6 provided on a side wall portion of the inner pipe portion 5 are provided. The supporting arm 6 is pivotally supported between the flat plate portions 2 and 3.

If the flat plate portions 2 and 3 are fastened in a direction in which they are in close contact with each other, for example, bolt nuts are used to penetrate the flat plate portions 2 and 3 and fasten the annular packing 4 to the outer side. The tube portion 1 and the inner tube portion 5 are in close contact with each other, and gas-liquid tightness is ensured.

[0009]

[Action]

 The inner pipe portion 5 is slidable in the outer pipe portion 1 formed in an arc shape, and the arc movement is accurately regulated by the support arm 6 axially supported between the flat plate portions 2 and 3. There is no rattling. Here, the two pipes to be connected are respectively connected to the outer pipe portion 1 and the inner pipe portion 5, the angles of both are appropriately set, and then the inner pipe portion 5 is fixed. Since it is possible to set the angle steplessly in this way, it is possible to easily deal with subtle bends and on-site adjustments.

Moreover, since it is not necessary to prepare a large number of types unlike the conventional joints, the cost is low. Also, since the airtightness is good due to the annular packing, it can be applied to the connection of gas pipes and water supply and drainage pipes, and a sufficient water blocking effect can be obtained.

[0011]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. The universal joint A for pipe connection is entirely formed by pressing an iron plate. The outer pipe portion 1 is formed by drawing a circular arc so that the inner surface has a partially notched circle, that is, a “C” shape. Further, flat plate portions 2 and 3 formed in a substantially isosceles triangular shape extend from the edge portion of each notch portion that extends in parallel in the outer pipe portion 1, that is, the notch portion of C. These flat plate portions 2 and 3 are extended in parallel with a clearance of several millimeters. A roundness is formed at each vertex of the flat plate portions 2 and 3 to ensure safe handling.

The outer tube portion 1 and the flat plate portions 2 and 3 are integrally pressed, and a perforated portion (not shown) is provided near each vertex of the flat plate portions 2 and 3 formed in a rounded triangular shape. ) Is formed.

On the other hand, an oil-resistant annular packing 4 is internally provided on the inner surface of the outer tube portion 1. The annular packing 4 is formed in an arc shape similar to the shape of the outer pipe portion 1, and is bonded to the outer pipe portion 1 so as not to move easily.

An inner pipe portion 5 is slidably fitted in the annular packing 4. The inner pipe portion 5 is formed by bending a pipe with the same curvature as that of the outer pipe portion 1, and a supporting arm 6 is welded to the side wall portion thereof. The support arm 6 is formed of an iron plate having a thickness substantially equal to the clearance of the flat plate portions 2 and 3, and is rotatably supported by a rivet 9 in a perforated portion formed at the top of the tip.

Bolts 7 are inserted through the perforated portions located at two locations near the outer pipe portion 1, respectively, and can be fastened with nuts 8. The angle of each of the outer tube portion 1 and the inner tube portion 5 is set to about 60 degrees, and the angle of withdrawal of the inner tube portion 5 is adjusted to an arbitrary angle within the range of 70 degrees to 110 degrees. Can be set. If the respective angles of the outer pipe portion 1 and the inner pipe portion 5 are set to 100 degrees, it is possible to cope with a bend of about 110 degrees to about 180 degrees, and it may be set appropriately according to the application.

With the above-described configuration, the inner pipe portion 5 can be slid in the arrow F direction in the outer pipe portion 1 formed by drawing an arc. Further, the inner tube portion 5 is free from rattling because the circular arc movement is accurately regulated by the support arm 6 which is pivotally supported by the rivet 9 between the flat plate portions 2 and 3.

In use, two pipes 20 and 21 to be connected are connected to the outer pipe portion 1 and the inner pipe portion 5, respectively. Then, after appropriately setting the angles of both, the bolts 7 are tightened to fasten the pipe 20 and the outer pipe portion 1 and to fix the outer pipe portion 1 and the inner pipe portion 5. As a result, the annular packing 4 is also appropriately crushed to improve the airtightness.

Since the stepless angle setting is possible in this way, it is possible to easily cope with a slight bend or a site alignment. Therefore, by using the universal joint A for pipe connection, the same route as in FIG. 7 can be obtained as in the route R shown by the one-dot chain line in FIG. Bending can also be easily realized. In the case of this example, a narrow-angle one that can be set to 150 degrees was used.

Further, unlike the conventional joints, it is not necessary to prepare a large number of types, so that the cost is low. Further, since the airtightness is good due to the annular packing 4, it can be applied to the connection of a gas pipe or a water supply / drainage pipe.

[0020]

[Effect of device]

 According to the present invention, the inner pipe portion is slidably supported in the outer pipe portion formed by drawing an arc, so that the outer pipe portion and the inner pipe portion can be set at an arbitrary angle. For this reason, it is possible to easily deal with slight bends and on-site adjustments, and at a low cost, there is no need to prepare many types as with conventional joints.

Further, the airtightness is also good due to the annular packing.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a partial sectional view showing an embodiment of the present invention.

FIG. 3 is a plan view of an essential part of a connected state of a pipe showing an embodiment of the present invention.

FIG. 4 is a plan view of a connected state of a pipe showing an embodiment of the present invention.

FIG. 5 is a plan view showing a conventional pipe connecting joint.

FIG. 6 is a side view showing a conventional pipe connecting joint.

FIG. 7 is a plan view showing an example of conventional pipe connection.

[Explanation of symbols]

 1 ・ ・ Outer tube part, 2, 3 ・ ・ Flat plate part, 4 ・ ・ Ring packing, 5 ・ ・ Inner tube part, 6 ・ ・ Support arm.

Claims (1)

[Scope of utility model registration request] 1. An outer pipe portion formed by drawing an arc so that a cross section of an inner surface is a partially cutout circle, a flat plate portion extending from each cutout portion of the outer pipe portion, and the outer pipe portion. An annular packing mounted on an inner surface, an inner tube portion slidably fitted into the annular packing, and a support arm provided on a side wall portion of the inner tube portion are provided. A universal joint for pipe connection characterized by being pivotally supported in.