JPH0314990A - Fitting of adaptor of universal joint and compression device used therefor - Google Patents

Abstract

PURPOSE:To enable fitting of adaptor easily by deforming the opening of swelling part, and releasing the deformation after fitting the adaptor, in a method for fitting adaptor for insertion of pipe in the swelling part for fitting plastic pipe end part. CONSTITUTION:Into a spherical swelling part for fitting formed on a plastic pipe part 5, an adaptor 3 for insertion of a ring-shaped plastic pipe having spherical face on its outer face, that is the adaptor 3 of a universal joint 1 rotatably fitted via a rubber ring 6. In this case, vertical and lateral parts opposing in the diameter direction of the outer wall face of the swelling part 4 are compressed relatively by a compression unit 10 formed of a press part 11, control part 12, and side wall plates 15, 16 to deform an opening part 4. The adaptor 3 is fitted from the opening part 4a, and thereafter compression of swelling part is cancelled. As a result, force to fit in the adaptor becomes unnecessary so that the fitting-in is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for inserting an adapter into a universal joint used for constructing a bent portion of a plastic pipe, and a compression device used in the method.

[Prior Art] When constructing a bent portion of a pipe, conventionally, a bent pipe joint with a predetermined bending angle and a fixed angle has been used. However, with this construction method, it is necessary to prepare a large number of bent pipe fittings with different angles molded according to the bending angle of the pipe line, and the production and inventory management of these bent pipe fittings are complicated.

Therefore, as an alternative to the above-mentioned bent pipe joint, the end of a plastic joint pipe is bulged into a spherical shell shape, as shown in FIG. A universal joint 1 has been devised in which a spherical shell-shaped plastic ring-shaped tube insertion adapter 3 is rotatably fitted.

According to this flexible fiber pipe 1, the bending angle can be arbitrarily set, and the above-mentioned drawbacks of the bendable pipe joint can be improved. As described above, this flexible fiber joint 1 has a spherical shell-shaped bulge 4 formed by bulging the end of the plastic joint pipe 2, and a spherical outer surface approximately equal to the inner diameter of the bulge 4. and a ring-shaped adapter 3 made of plastic and having a substantially spherical shape, and the adapter 3 is fitted into a bulge 4. To manufacture this flexible fiber hand 1, the above-mentioned adapter 3 is fitted into the bulge 4. The outer diameter of the adapter 3 is approximately the same as the inner diameter of the bulge 4, The opening is made smaller than the outer diameter of the adapter 3 so that the adapter 3 does not easily fall off.

Therefore, as a method for fitting the adapter 3 into the bulge 4, Japanese Patent Publication No. 59-17315 discloses that the ring-shaped adapter 3 is elastically flattened, and the long axis of the flattened portion is aligned with the bulge 4. Disclosed is a method of press-fitting into the interior through an opening.

Furthermore, Japanese Patent Publication No. 1-21393 discloses a method of forming the adapter 3 by forcibly press-fitting it through the opening of the bulge 4. [Problems to be Solved by the Invention] However, the former method requires high press pressure to flatten the highly rigid adapter manufactured by injection molding, and There is a problem in that a complicated device is required to fit the adapter into the bulge in a pressed state.

In addition, in the latter method, since the adapter's forced presser deforms the opening of the bulge and inserts the adapter, unreasonable stress is applied to the edges of the bulge's opening, making it impossible to expect smooth insertion and reducing quality. Considering this, there is a problem that productivity is low because each set must be carefully produced.

Therefore, in order to solve the above-mentioned problems, the present invention makes it easy and simple to insert the adapter into the bulge.
Moreover, it is an object of the present invention to provide a method for inserting an adapter into a universal joint that can improve productivity, and a compression device used in the method.

[Means for Solving the Problems] Next, means for achieving the above object will be described with reference to FIGS. 1 to 5, which correspond to embodiments.

A method for fitting an adapter into a universal joint according to the present invention includes a fitting bulge 4 in the shape of a spherical shell formed by bulging at the end of a plastic pipe.
In a universal joint adapter insertion method, a plastic ring-shaped tube insertion adapter 3 having a spherical outer surface approximately equal to the inner diameter of the bulging portion 4 is rotatably inserted via a rubber ring 6. The opening 4a of the bulging portion 4 is elastically deformed by relatively pressing the diametrically opposed upper, lower, right and left portions of the outer wall surface of the bulging portion 4.
Insert the adapter 3 from the outer wall side of the adapter 3 from a,
After that, the pressure on the bulging portion 4 is released and the adapter 3 is rotated by half a turn.

In addition, the compression device 10 of the present invention has a fitting bulge 4 that is bulged and formed at the end of a plastic pipe and constitutes a universal joint.
The press part 11 compressively deforms the facing surface of the outer wall surface of the bulge, and the press part 11 regulates the long axis of deformation of the bulge 4 to be deformed, and the shape of the opening 4a of the bulge is adjusted to the shape of the bulge. It is characterized by comprising a regulating part 12 that substantially matches the outer shape of the ring-shaped adapter 3 to be fitted into the ring-shaped adapter 4.

[Function] By the press part 11 and the regulating part l2 of the compression device 10,
The bulging portion 4 is compressed from the top, bottom, left and right directions, deforms into a square shape,
The opening 4a of the bulge 4 substantially matches the outer shape of the adapter 3.

Then, from the opening 4a of the deformed bulge 4, the bulge 4
A universal joint is formed by inserting the adapter 3 into the housing from the outer wall side thereof through the rubber ring 6.

[Actual Travel Example] FIG. 1 is an exploded perspective view of a universal joint manufactured according to the present invention.

First, the universal joint 1 is composed of a plastic joint pipe 2 and an adapter 3. A fitting bulge 4 in the shape of a spherical shell is formed at the end of the joint tube 2 by blow molding, injection molding, or the like. The bulging portion 4 is formed to have a slightly thinner wall thickness than the tube portion 5, and has a slightly lower rigidity.

On the other hand, the adapter 3 has a spherical outer surface approximately equal to the inner diameter of the bulging portion 4, and is formed into a generally ring-shaped plastic made by cutting both sides of a spherical body. A groove 3a for attaching a rubber ring is formed on the outer peripheral surface of the adapter 3. Furthermore, on the inner peripheral surface of this adapter 3, a groove 3b for attaching a rubber ring is formed on one end side, and a groove 3b for attaching a rubber ring is formed on the other end side.
A stopper 30 is formed which projects inward in the form of a flange.

Next, the compression device 10 used when manufacturing the flexible fiber hand 1 by fitting the adapter 3 into the above-described bulge 4 will be explained.

As shown in FIGS. 2 and 3, this compression device is roughly composed of a press section 1l and a regulating section 12.

First, the press section 11 is composed of a base 13 and a press plate 14. The base 13 has a rectangular horizontal surface,
A press plate 14 is located on this horizontal plane, which is provided parallel to this horizontal plane. The press plate 14 is connected to a hydraulic cylinder 17 so that it can move vertically with respect to the base 13, and also presses the base 1 from a predetermined position.
When moving in the direction 3, the hydraulic cylinder 17 generates a predetermined pressure while moving.

Further, the regulating portion 12 is composed of a pair of side wall plates 15 and 16, each of which is provided perpendicularly to the upper surface of the base 13.

These side wall plates 15.16 are provided parallel to each other, and the distance between each side wall plate 15.16 is set to be slightly larger than the outer diameter of the bulged portion 4. Furthermore, the height of each side wall plate 15, 16 is set to be slightly larger than the radius of the bulge 4.

Next, a method for inserting an adapter into a universal joint according to the present invention will be explained.

First, each full 3a formed on the inner and outer circumferential surfaces of the adapter 3
, 3b are attached with the rubber ring 6.

Next, as shown in FIGS. 2 and 3, the bulging portion 4 is placed on the base 13 with the opening 4a facing the front (downward in FIG. 3).

After the mounting, the press plate 14 is operated to compress the diametrically opposed upper and lower portions of the outer wall surface of the bulged portion 4 with a predetermined pressure, thereby elastically deforming the outer wall surface of the bulged portion 4 . When this bulge 4 is compressed, it first deforms into a substantially elliptical shape with the long sleeve in the horizontal direction. These are both sides (
Since side wall plates 15 and 16 are provided on the left and right sides, the long sleeves do not become larger than a predetermined length. As the compression progresses further, the opening 4a of the bulge 4 opens as shown in FIG. It changes into a shape in which the top, bottom, left, and right sides are pressed relative to each other, that is, a substantially rectangular shape.

Then, in this state, the adapter 3 is inserted manually (arrow B in FIG. 5). Fitting is performed with the center axis of the adapter 3 and the center axis of the bulge 4 being perpendicular to each other as shown in FIGS. 4 and 5.

When fitting, the opening shape of the bulge 4 approximately matches the outer shape of the adapter 3 as seen from the outer wall surface as shown in FIG. 4, so the adapter 3 comes into contact with the opening edge of the bulge 4. It can be inserted without any resistance.

After fitting, the press plate 14 stops compressing and rises, and the bulge 4 returns to its original shape. Then, by rotating the adapter 3 inserted into the bulge 4 by a half turn so that it coincides with the center axis of the bulge 4, the flexible fiber arm 1 shown in FIG. 6 is obtained.

The flexible fiber 1 thus obtained is inserted into the adapter 3 from one end of the tube 7 shown by the dashed line in Figure TJ6 until it abuts against the stopper 3C. The angle between the tube 7 and the tube 2 in which the bulge 4 is formed can be adjusted over a wide range by rotating the adapter 3.

The compression device of this embodiment has side wall plates 15 and 16 on the base.
As shown in FIG. 7, one side wall plate 18 is fixed and the other side wall plate 19 is movable, or as shown in FIG. The wall panels 20,21 may be movable. In this case, the movable side wall plates 19, 20, 21 shown in each figure are slidably mounted on the base 13 via rails 22, and a hydraulic cylinder 23 is connected to each of them in the same manner as the press plate 11. According to this device, even when the size of the bulging portion 4 is different or the shape of the adapter is different, it can be handled by adjusting the distance between the side wall plates.

Moreover, in the compression device of this embodiment,! We have described an example in which a set of universal joints can be obtained, but by arranging multiple sets of side wall plates in series on the base, it is possible to obtain multiple sets of universal joints with a single compression operation, improving productivity. This has the effect of being able to do this adequately. Further, in this embodiment, although the process of fitting the adapter into the bulge that has been deformed by the compression device is performed by a worker, a device capable of fitting the adapter may be attached. In this case, the adapter is held and the adapter is fitted into the bulge.

[Effects of the Invention] As explained above, in the method for inserting an adapter into a universal joint according to the present invention, the bulge portion, which has relatively low rigidity, is deformed into approximately the outer shape of the adapter to insert the adapter, so that the force for inserting is small. This has the advantage that it is not necessary and can be easily and easily inserted.

Further, when compressing and deforming the bulge, the compression device according to the present invention not only deforms the bulge into an elliptical shape, but also allows the opening of the bulge to match the outer shape of the adapter by the regulating portion, so that the bulge is deformed. This has the effect that the adapter can be easily fitted into the opening. This has the effect that the universal joint can be manufactured easily and productivity can be improved.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a universal joint manufactured according to the present invention, Fig. 2 is a schematic front view showing an embodiment of a compression device according to the present invention, and Fig. 3 is a line m-■ in Fig. 2. 4 is an explanatory diagram of the operation of the compression device, FIG. 5 is a sectional view taken along the line V-V in FIG. 4, FIG. 6 is a longitudinal sectional view of the universal joint formed according to the present invention, and FIGS. FIG. 8 is a schematic front view of a compression device according to another embodiment. 1.1 universal joint, 3.-adapter, 4.bulge, 4a.1 opening, 6.rubber ring,
1 0 --- compression device, 11 --- breath section,
l2-Regulatory Department. Figure 3

Claims (1)

[Claims] 1. A ring-shaped plastic ring having a spherical outer surface that is approximately equal to the inner diameter of the bulged portion on a spherical fitting bulge formed at the end of the plastic tube. In the adapter fitting method for a universal joint in which a pipe insertion adapter is rotatably fitted via a rubber ring, the upper and lower and left and right portions of the outer wall surface of the bulging portion that are diametrically opposed to each other are relatively pressed. The opening is elastically deformed, the adapter is fitted from the outer wall side of the opening of the bulge, and then the pressure on the bulge is released and the adapter is rotated half a turn. How to insert an adapter into a universal joint. 2. A press part that compresses and deforms the opposing surface of the outer wall surface of the fitting bulge forming the universal joint formed by bulging at the end of the plastic pipe, and the deformation length of the bulge that is deformed by the press part. A compression device comprising: a regulating part that regulates a shaft and makes the shape of the opening of the bulging part substantially match the outer shape of a ring-shaped adapter that is fitted into the bulging part.