JPS63225785A - Assembly manufacture of rocking extensible universal joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for suitably manufacturing a swingable and telescopic pipe joint that connects pipe bodies such as water pipes in a flexible and swingable manner.

(Prior art) Conventionally, as this type of swingable telescoping pipe joint, for example, the
As shown in the figure, two movable tubes 14e, 14e each having a spherical surface 12e on the outer end side are connected to a joint body 2 which is divided into two parts.
0.20, the two movable tubes 14e, 14e are slidably fitted into each other, and the inner ends of the two movable tubes 14e, 14e are slidably fitted into each other. In the case of this type of slidable joint, there is also a stopper 6 for preventing the movable tubes 14e and 14e from coming off each other and setting the expansion/contraction stroke, a locking protrusion 3 capable of locking the stopper 6; A splittable nut 40 and the like are provided.

Therefore, in the past, the diameter of the pipe joint was, for example, 700 f.
1 or more, it is difficult and expensive to process each movable tube 14e by machining.
In reality, two movable tubes 14e and 14e having diameters of 14e and 14e were integrally formed by molding means, and then the movable tubes 14e and 14e having different diameters were fitted together.

(Problems to be Solved by the Invention) However, as in the prior art, the large-sized movable tubes 14e and 1 are composed of a spherical portion 12e and a tube portion connected thereto.
The method of integrally molding 4e by molding has the problem that the mold used therein becomes very large, leading to high mold manufacturing costs and complicated and difficult casting work.

Moreover, the conventional pipe joint has two movable pipes 14e, 14.
In order to make the left and right apertures of e different and to fit them into each other, it is necessary to use molds of two different sizes when manufacturing the two movable tubes 14e, 14e, which increases the cost required for manufacturing the molds. This had the problem of making it even more expensive.

In addition, when manufacturing this type of pipe joint, it is necessary to set various allowable steps H at both ends of the pipe joint in accordance with various usage conditions such as the ground conditions in which it will be buried. This setting must be made by changing the dimensions of the tube portions of both movable tubes 14e, 14e and increasing or decreasing their sliding dimensions. Therefore, in the past, each time the allowable level difference H was changed, both movable tubes 14e, 14e
As a result, it becomes necessary to modify the mold each time or create a new mold to manufacture the movable pipe, which is extremely complicated and fatal when manufacturing the joint. This had become a major problem.

The present invention was invented in view of the above-mentioned conventional problems.
The purpose and performance of this is to make it easier and cheaper to manufacture a movable tube without using multiple large molds, etc., and to change the dimensions of the movable tube when changing the allowable level difference of the joint. The point is that it can be easily handled without requiring such complicated efforts.

(Means for Solving the Problems) The present invention forms a movable tube by connecting a spherical portion and a tube body portion separately manufactured, and also sets the stroke dimensions of the two movable tubes. This structure is designed to solve the above-mentioned problems of the conventional art by connecting two movable tubes through a tube body separate from the movable tube so that the change can be made by a tube body separate from the movable tubes.

That is, the gist of the assembly manufacturing method according to the present invention is that two sleeve tubes 4a are provided with locking convex portions 3 on the inner surfaces of their outer ends.
, 4a has a tube body 5.5 provided at its rear end with a stopper 6 that can engage with the locking convex portion 3.
a, 4a, and then protruding from each outer end of the sleeve tubes 4a, 4a.
．． A spherical body 12.1 is separately cast at the tip of 5 so that it can be slidably inserted into the joint body 20.20.
2 are fixedly connected to each other to form a movable tube 14, 14,
Thereafter, the inner ends of the sleeve tubes 4a, 4a are interconnected.

(Function) Therefore, in the method for assembling and manufacturing a pipe joint characterized by the above configuration, in order to change the expansion/contraction dimension of the movable pipe 14, 14 in order to change and set the allowable level difference of the pipe joint, the sleeve pipe 4a is , by changing the dimensions of 4a, the movable tube 14.14
The stopper 6.6 is the sleeve tube 4a-.

The movable tube 14.4a only needs to increase or decrease the range that is regulated by contact with the locking convex portion 3.3 of the movable tube 14.4a.
There is no need to newly manufacture 14.

In addition, since the movable tube 14 is configured by connecting the tube body 5 and the spherical body 12, which are manufactured separately, at the time of assembly, the spherical body 1
In the case of No. 2 casting, the mold can be made compact. Furthermore, since the movable tubes 14 and 14 are connected to each other by being fitted into the sleeve tubes 4a and 4a, the movable tubes 1
By making the diameters of the tube portions 4.14 the same, both movable tubes 14.14 can be manufactured to have exactly the same size and shape.

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

First, as shown in FIG. 1, a sleeve tube 4a having a flange 1 on the outer periphery of the outer end and a tapered surface 2 and a locking protrusion 3 formed on the inner surface thereof is inserted into the sleeve tube 4a on the inner end 22 side thereof. The tube body 5 is inserted through the tube as shown by the two-dot chain line in the figure, and the tube body 5 and the sleeve tube 4a are each formed into a cylindrical shape by winding a thin sheet iron plate.

A stopper 6 is provided on the outer periphery of the rear portion of the tube body 5, and the stopper 6 is formed by welding a ring-shaped member onto the tube body 5 and engaging the locking convex portion 3 on the sleeve tube 4a side. The locking protrusion 3 and flange 1 on the other sleeve pipe 4a side are also ring-shaped members separate from the sleeve pipe 4a and are welded together. Incidentally, an anti-corrosive paint such as epoxy resin is applied in advance to portions A and B around each of the locking convex portion 3 and the stop and bar 6.

Thereafter, as shown in FIG.
a, a ring-shaped sealing gasket 7, a hollow disc-shaped pusher body 10 having a protruding piece 8 that comes into contact with the gasket 7, and a hole 9 for inserting bolts, etc., protruding from the outer end side of a. ,
and a rubber extensible cover unit 11 respectively attached to the tube body 5.
Fit it on the outside.

Next, as shown in FIG. 3, a hollow spherical body 12 is fixedly connected to the tip of the tube body 5 by welding to form a movable tube 14. At this time, the spherical body 12 or the tube body 5 is An inner casing 20a (a component of the joint body 20) having a concave spherical surface 21 into which the spherical body 12 is slidably fitted is fitted onto the outside (.

Incidentally, the spherical body 12 is cast in advance in a separate operation.

In addition, for the combination of the sleeve tube 4a and the movable tube 14 as described above, at least two sets of the same size and shape are manufactured, and then a fourth
As shown in the figure, each sleeve pipe 4a,
The inner ends 22,22 of 4a are welded together to form a fixed sleeve tube 4.

Thereafter, the inner surfaces of the sleeve pipe 4 and the movable pipe 14.14 are painted, and the outer casings 20b, 20b each have a connecting flange 15 for connecting the pipe bodies as shown in FIG.
are connected to the inner casings 20a, 20a to form the joint body 2.
0.20 to hold each spherical body 12 portion of the movable tube 14.14. Thereafter, as shown in the figure, the sealing gasket 7.7 is inserted into the gap in the tapered surface 2.2 at the outer end of the sleeve tube 4, and the stepped portion of the screw shaft 19 inserted through the pusher 10 is inserted. 23 is engaged with the flange 1 of the sleeve tube 4, the screw shaft 19 is tightened to press the gasket 7.7, and the cover unit 11 is then placed over the inner casings 20a, 20a.

Therefore, in the pipe joint assembled as described above,
Each movable tube 14.14 is expandable and retractable to the extent that the stopper 6.6 abuts and locks on the locking convex portion 3.3 with respect to the sleeve tube 4, and each movable tube 14.14 is Since it is swingable with respect to the left and right joint bodies 20, 20, when a vertical force is applied to both ends of the pipe joint, a step H is created as shown in Fig. 6, and the pipe joint and It is possible to alleviate and absorb bending forces that act on the pipe body connected to the pipe joint.

Therefore, when manufacturing the pipe joint, the maximum allowable step H is determined in advance by considering the use of the pipe joint. In this case, it can be changed appropriately by changing the movable stroke of each movable tube 14.14.

Therefore, in order to change the dimensions, it is only necessary to appropriately change the dimensions of the sleeve tube 4a at the time of manufacture, that is, at the stage shown in FIG. 1, and there is no need to change the dimensions of the movable tube 14 at all. Therefore, the tube body 5 and the spherical body 1 with the same size and shape
2, it is possible to manufacture a plurality of pipe joints with different height differences H.

In the above embodiment, the two sleeve pipes 4a, 4
a are welded to each other and are finally made to move integrally, but the present invention is by no means limited to the specific means for connecting the sleeve pipes 4a, 4a. For example, as shown in FIG.
It is possible to separately fix the flange member 23.23 by welding or the like, and connect the flange member 23.23 detachably by tightening means such as bolts 24. According to this means, the pipe joint It has the advantage of being able to be disassembled after assembly. In this way, the present invention has two sleeve pipes 4a, 4a.
It does not matter whether or not they are connected in an integral fixed state.

Further, in the above embodiment, after the tube body 5 is inserted into the sleeve tube 4, the sealing gasket 7 is fitted onto the tube body 5 and pressed by the screw shaft 19. Although it has the advantage of providing good water-stop sealing properties and being easy to attach the packing, the present invention is not concerned with the method of attaching the packing. The manner in which the gasket is attached is, for example, as shown in FIG. It is also possible to insert .

Furthermore, the present invention does not limit the specific processing and manufacturing means of the tube body 5, the specific mounting manners and manufacturing means of the stopper 6, the locking protrusion 3, and the joint body 20; All steps in the assembly manufacturing method can be modified within the intended scope of the present invention.

(Effects of the Invention) As described above, the present invention provides a state in which two sleeve tubes each having a locking step are inserted with a movable tube provided with a stopper, and then the inner end of each sleeve tube is inserted. By interconnecting the parts, the two left and right movable pipes are connected more freely within the stroke length range, so when changing the allowable step of the pipe joint, it is necessary to replace the conventional two movable pipes. Unlike direct fitting methods, there is no need to change the dimensions of the movable tube, which is complicated to manufacture, and the structure is simpler than the movable tube and can be easily manufactured by appropriately changing the sleeve tube. The special effect of being able to change the dimensions of the allowable step difference has been achieved.

Moreover, since the present invention is a means of manufacturing a movable tube by connecting a tube body and a spherical body that are manufactured separately during assembly, the manufacturing process is performed by integrally casting the tube body and the spherical body, which are conventionally manufactured. There is no need to use a large mold as was the case with previous methods, and only the spherical body can be easily cast using a small mold, making the overall manufacturing workability of the movable tube much simpler than before. This has the excellent advantage of reducing the cost burden required for molds.

In addition, the present invention connects the two sleeve tubes after inserting the left and right movable tubes into the two sleeve tubes, thereby connecting the movable tubes and thereby integrating the pipe joint. Therefore, it is no longer necessary to make the diameters of the left and right movable tubes different as in the past, and as a result, all components such as the left and right movable tubes and sleeve tubes are made to have the same size and shape. There are also great practical benefits in that the productivity of parts can be improved, the workability of manufacturing joints can be further improved, and the manufacturing costs can be significantly reduced.

[Brief explanation of the drawing]

1 to 5 are cross-sectional views showing an embodiment of the manufacturing method according to the present invention. FIG. 6 is a sectional view of the pipe joint in use. FIG. 7 is a sectional view showing another embodiment. FIG. 8 is a half-cut sectional view showing a conventional example. 3...Locking convex part 4a...Sleeve pipe 5...Pipe body 6...Stopper 1
2... Spherical body 14... Movable tube 20
...Fitting body applicant Suiken Technology Co., Ltd. Representative Patent attorney Noboru Fujimoto Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A stopper 6 that can engage with the locking projection 3 is attached to the rear end of the two sleeve tubes 4a, 4a each having a locking projection 3 on the inner surface of the outer end. After inserting the tube bodies 5, 5 provided in the sleeve tubes 4a, 4a from the respective inner end sides of the sleeve tubes 4a, 4a, the tube bodies 5, 5 protruding from the respective outer ends of the sleeve tubes 4a, 4a. Separately cast spherical bodies 12, 12 are fixedly connected to the distal ends of the sleeves to form movable tubes 14, 14, respectively, so that the spherical bodies 12 can be slidably fitted into the joint bodies 20, 20. A method for assembling and manufacturing a swingable telescopic pipe joint, characterized in that the inner ends of the pipes 4a, 4a are interconnected. 2. The method for assembling and manufacturing a swingable telescopic pipe joint according to claim 1, wherein the means for firmly connecting the spherical bodies 12, 12 to the tube bodies 5, 5 is welding. 3. Claim 1, wherein the means for interconnecting the inner ends of the two sleeve tubes 4a, 4a is welding.
A method for assembling and manufacturing a swingable telescoping pipe joint as described in . 4. Means for interconnecting each inner end of the two sleeve tubes 4a, 4a is provided with a flange member 23, 2 at each inner end.
3. A method for assembling and manufacturing a swingable telescoping pipe joint according to claim 1, wherein the flange members 23, 23 are removably fastened to each other by welding the flange members 23, 23 to each other by means of a fastening member.