JPH0144879Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint that is fitted to two pipes when they are butt-connected.

Among these types of joints, external fitting type joints whose inner circumferential diameter is larger than the outer circumferential diameter of the pipe make it easy to fit the joint onto the pipe, but the joint condition after fitting is difficult. It cannot become strong as it is, so in order to obtain a strong bond,
For example, it may be necessary to bond the fitting and the tube using an adhesive. However, when trying to obtain a strong bonded state by adhesion, extra effort is required to apply the adhesive.

On the other hand, in the case of joints whose inner diameter is smaller than the outer diameter of the pipe, such as those made of thermoplastic synthetic resin, it is possible to soften the joint by heating it. It is necessary to press firmly against the pipe, thereby expanding the diameter of the fitting and fitting it into the pipe. According to this method, even if a strong joint can be obtained, skill is required to fit the joint into the pipe.

This idea was made in view of the above circumstances.
The purpose of the present invention is to provide a joint that can be easily fitted to a pipe and that can make the joint after fitting strong without requiring extra effort or skill. shall be.

In order to achieve this purpose, the joint according to the present invention has a recessed groove whose depth changes continuously in the cylindrical joint body, and a spacer is held in the recessed groove, and When fitting the fitting body, place the spacer in the deep part of the recessed groove so that the fitting body can be easily fitted to the pipe. A spacer placed at a shallow depth is sandwiched between the pipe and the joint body, thereby bringing the two into pressure contact, thereby making it possible to obtain a strong joint.

The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 shows an example of a joint A according to the present invention.As shown in the figure, the joint A includes a cylindrical joint body 1 having annular enlarged diameter portions 11 at a plurality of equally spaced locations, and a spacer 2. have. As is clear from FIG. 2, the expanded diameter portion 11 is eccentric with respect to the center 0 of the joint body 1, and the depth of the annular recessed groove 12 inside the expanded diameter portion 11 is continuous. configured to change. Specifically, the recessed groove 12
The depth gradually becomes shallower as you move away from the deepest point a, and the farthest point 180
The point b, which has been displaced by a degree, is the shallowest.

On the other hand, the spacer 2 shown in FIG. 1 has a cylindrical shape, and its length is set to be slightly smaller than the groove width of the recessed groove 12 explained in FIG. Further, the diameter d ₁ of the spacer 2 must be at least larger than the depth d _b of the shallowest portion b of the recessed groove 12 explained in FIG.

Next, a case where two corrugated pipes are butt-connected will be explained.

As is clear from FIG. 3, the corrugated pipe 10
0 is a corrugated pipe 10 having expanded diameter portions 101 at multiple locations at required intervals.
0, the inner diameter _D1 of the joint body 1 is the same as or larger than the outer diameter _D2 of the expanded diameter part 101 in the corrugated pipe 100. is necessary, and the groove width l ₁ of the recessed groove 12 is larger than the above-mentioned expanded diameter portion 1.
It is desirable that the dimensions be the same as the mutual spacing l ₂ of 01. Further, as is clear from FIG. 4, the diameter d ₁ of the spacer 2 is the deepest point a of the recessed groove 12
is smaller than the distance L ₁ between the inner surface of the corrugated pipe 100 and the outer surface of the enlarged diameter portion 101 of the corrugated pipe 100, and the recessed groove 12
The gap must be larger than the distance L ₂ between the inner surface of the shallowest point b and the valley bottom 102 between the expanded diameter portions 101, 101 between the corrugates 100.

According to the joint A that satisfies the above conditions, if the spacer 2 is placed at the deepest point a of the recessed groove 12 as shown in FIG. The joint body 1 can be fitted into the corrugated pipe 100 without causing interference between the joint body 100 and the spacer 2. in this case,
As is clear from the explanation in FIG. 3, the inner diameter D ₁ of the joint body 1 is not smaller than the outer diameter D ₂ of the expanded diameter portion 101 of the corrugated pipe 100, so that the joint body 1 can be easily attached to the corrugated pipe. 10
0 can be fitted.

In this way, the joint body 1 is fitted into the corrugated pipe 100, and the recessed groove 1 is inserted as shown in FIG.
2 to correspond to a predetermined trough of the corrugated pipe 100, the spacer 2 is inserted into the recessed groove 12 in the joint body 1.
When the spacer 2 is relatively moved within the recessed groove 12 to approach the shallowest point b of the recessed groove 12, a part of the spacer 2 protrudes from the recessed groove 12 at a point in the middle, and the recessed groove 12 of the joint body 1 and the valley bottom 102 between the corrugates 100.
In order to move the spacer 2 inside the recessed groove 12 and bring it closer to the shallowest point b, the spacer 2 is accommodated in the deepest point a of the recessed groove 12 as shown in FIG.
After the corrugated pipe 100 and the joint body 1 are fitted together, the joint body 1 is rotated to the left or right around the corrugated pipe 100 to gradually move the deepest point a of the recessed groove 12 upward. Good. In this way, even though the joint body 1 rotates, the spacer 2 remains in the position shown by the solid line in FIG. The shallow parts gradually shift to joint body 1.
When the spacer 2 rotates by a predetermined angle within 180 degrees, a part of the spacer 2 protrudes from the recessed groove 12 as described above, and the inner surface of the recessed groove 12 of the joint body 1 and the valley bottom surface 102 of the corrugated space 100 meet. Contact both.

From this state, when the joint body 1 is further rotated in the same direction (at this time, the corrugated pipe 100 may be rotated instead of rotating the joint body 1, or both may be rotated in opposite directions). As shown in Figure 5, the spacer 2 is further recessed into the groove 1.
The corrugated tube 100 moves in a direction approaching the shallowest point b of the corrugated pipe 100, and is held between the valley bottom surface 102 of the corrugated pipe 100 and the inner surface of the recessed groove 12 at that position. Depending on the diameter d ₁ of the spacer 2, the spacer 2 may be attached to the corrugated pipe 10 at the shallowest point b of the recessed groove 12.
0 may be sandwiched between the valley bottom surface 102 and the inner surface of the recessed groove 12. When the spacer 2 is clamped in this way, the joint body 1 and the corrugated pipe 100 are connected at the opposite position, that is, at a point P displaced by 180 degrees from the clamping position.
are pressed together. In this state, as shown in FIG. 6, the spacer 2 is engaged with both the recessed groove 12 of the joint body 1 and the valley of the corrugated pipe 100 in the insertion/removal direction, and the reaction force due to the fact that the spacer 2 is clamped is generated. Since the joint body 1 and the corrugated pipe 100 are in pressure contact as described above, they are firmly joined.

Therefore, both ends of the joint body 1 shown in FIG. 1 are connected to two corrugated pipes 100, 1 as shown in FIG.
00 to fit these corrugated pipes 10
0 and 100, and sandwich the spacers 2, 2, which were previously placed in the two recessed grooves 12, 12 of the joint body 1, between the joint body 1 and each corrugated pipe 100, 100, two The corrugated pipes 100 are securely connected by the joint A.

After fitting the joint body 1 to the corrugated pipe 100, the spacer 2 can be moved from the deepest position of the recessed groove 12 shown in FIG. It is easily rolled and moved to the sandwiched position between the joint body 1 and the corrugated pipe 100 shown in FIG.

In the above, when fitting the joint body 1 to the corrugated pipe 100, the spacer 2 is completely inserted into the recessed groove 10.
Although the case has been described in which the corrugated pipe 100 is accommodated in
If D ₂ is extremely smaller than the inner circumferential diameter D ₁ of the joint body 1, even if a part of the spacer 2 protrudes from the recessed groove 12, the two can be easily fitted together, so it is not necessarily the case as shown in FIG. As explained above, it is not necessary that the spacer 2 is completely accommodated in the recessed groove 12 at the deepest point a of the recessed groove 12.

Next, the joint body is not limited to the one illustrated in FIG. 1, and may have an annular recessed groove formed only at both ends of the cylindrical body, but as shown in FIG. In the case where the section 11 is provided, since the expanded diameter section 11 serves as a reinforcing rib, there is an advantage that the strength is improved when two corrugated pipes 100, 100 are connected as shown in FIG. Furthermore, the two pipes to be connected are not limited to corrugated pipes, but may have smooth outer surfaces or have threaded protrusions. When connecting pipes having the same structure, it is desirable that the recessed groove provided in the joint body be formed in the threading direction.

Further, when the spacer is made into a columnar shape as described above, by making the outer circumferential surface jagged, it is possible to prevent the joint body and the pipe from returning after joining and loosening the joined state. Further, the spacer may have a crescent shape, for example, as shown in FIG. When the spacer 2 shown in FIG. 8 is used, when the joint body is fitted onto a pipe and rotated, the spacer 2 slides inside the recessed groove of the joint body and is moved to a shallower location. As a result, the joint body and the pipe are firmly joined as described above.

The above-mentioned joints can be used regardless of whether they are steel pipes or synthetic resin pipes, but for example, when used to connect synthetic resin corrugated pipes buried underground as culvert drainage pipes, the joint body of the joint It is desirable that both the spacer and the spacer are made of synthetic resin. If the joint and the pipe are both made of synthetic resin, when the spacer is sandwiched between the pipe and the joint body and the two are brought into pressure contact, either or all of the spacer, the pipe, and the joint body become elastic. As the parts are deformed, their elastic restoring force pushes the three parts together, resulting in an even stronger bond.

As is clear from the detailed description above, the joint according to the present invention can be removed from the deep part of the recessed groove of the joint body by appropriate means such as rotating the joint body fitted to the pipe relative to the pipe. The pipe and the fitting body can be firmly joined by simply moving the spacer to a shallow location. Therefore, the two pipes can be reliably connected. Furthermore, since a strong joint can be obtained as described above even if the inner circumferential diameter of the joint body is not smaller than the outer circumferential diameter of the pipe, the two can be easily fitted together.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a joint according to an embodiment of the present invention, Fig. 2 is a vertical cross-sectional front view of the joint main body, Fig. 3 is a vertical cross-sectional side view showing a state in which the joint main body is fitted into a pipe, and Fig. 4 is a vertical cross-sectional view of the joint main body.
The figure is an explanatory diagram corresponding to the XX cross-sectional view in Figure 3, and Figure 5 is a longitudinal sectional front view showing the joint state of the pipe and the joint.
6 is a sectional view taken along line Y--Y in FIG. 5, FIG. 7 is a partial sectional view showing how two pipes are connected, and FIG. 8 is a perspective view showing a modified example of the spacer. A...Joint, 1...Joint body, 12...Recessed groove, 2...Spacer.

Claims (1)

[Claims for Utility Model Registration] Comprising a cylindrical joint body and a spacer interposed between a pipe and the joint body fitted to the pipe, the joint body has a continuous depth in the circumferential direction. A recessed groove that changes is provided, and when the spacer is housed in the deepest part of this recessed groove, the deepest part of the recessed groove The depth of the location is set, and when the spacer is relatively moved inside the recessed groove by rotating the joint body and reaches a point halfway from the deepest point to the shallowest point of the recessed groove, The spacer is in contact with both the fitting body and the pipe, and by rotating the fitting body and the pipe relative to each other, the spacer is brought closer to the shallowest point from an intermediate point, or the spacer is moved to the shallowest point. In this state, the depth of each part of the recessed groove is set so that when the spacer is held between the pipe and the fitting body, the pipe and the fitting body press against each other at a position opposite to the pinching point. A fitting characterized by: