JPH0755435Y2 - Branch connection fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a branch connection pipe joint for connecting a branch pipe to a peripheral wall of a pipe body.

(Prior Art) Conventionally, as a connection structure of this type of branch connection pipe joint, for example, one disclosed in JP-A-60-151411 is known.

In this connecting structure, as shown in FIG. 7, a branch hole b is bored in the peripheral wall of the ribbed pipe a, and the base end portion of the branch pipe connecting portion c is inserted into the branch hole b and the base end portion is inserted. The saddle portion d protruding from the outer periphery of the rib is applied to the outer surface of the ribbed pipe a, and the protrusion e protruding between the ribs of the saddle portion d is fitted between the ribs f of the ribbed pipe a and joined together. Prevents a gap from being formed between the joint surface of the saddle part d and the outer peripheral surface of the ribbed pipe a.
The branch connection pipe joint is designed to be firmly connected to the ribbed pipe a.

(Problems to be solved by the invention) However, in the above-described conventional connection structure, the projections e protruding from the joint surface of the saddle portion d and the shapes of the ribs f of the ribbed tube a are completely the same. As described above, unless the protrusions e ... Are formed in accordance with the shape of each rib f, the outer peripheral surface of the ribbed tube a and the joint surface of the saddle part d do not follow well, and therefore the adhesion between the two is not good. There was an inconvenience that the water level decreased and the water stopping was incomplete. Further, even if the projections e ... Are formed in accordance with the shape of each rib f, the shape of the joint surface becomes complicated, which causes a problem that the manufacturing cost increases.

Further, if mud, sand, or the like adheres between the ribs f, the joint surface of the saddle portion d is lifted up, and it may not follow the outer peripheral surface of the ribbed pipe a.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a branch connection pipe joint that can easily come into close contact with the inner peripheral edge portion of a branch hole to obtain a reliable water stop.

(Means for Solving the Problem) A branch connecting pipe joint of the present invention is a branch connecting pipe joint for connecting a branch pipe to a peripheral wall of a pipe body, and a branch pipe connecting pipe capable of connecting an end portion of the branch pipe, An inner pipe attached to a branch hole bored in the pipe body, an insertion portion into which the inner pipe and the branch pipe connecting pipe can be inserted, and a base end portion of the insertion portion substantially along the outer circumference of the pipe body. It consists of a saddle part that is curved so that the inner tube
While a locking projection is formed to prevent the branch hole from falling into the branch hole, and a close contact portion that has an elastic ring larger than the diameter of the branch hole and is expandable and contractible in the radial direction of the branch hole is provided.
The branch pipe connecting pipe is formed with a collar portion that comes into contact with the side edge of the insertion portion, and the branch pipe connecting pipe and the inner pipe can be screwed to each other.

(Operation) At the outer peripheral edge portion of the branch hole formed at a proper position on the peripheral wall of the ribbed pipe,
The saddle portion is brought into contact with the branch hole and the insertion portion in communication with each other. Then, the contact portion of the inner pipe is deformed, and the inner pipe is inserted into the branch hole from the insertion portion. Then, the close contact portion of the inner pipe expands in the radial direction inside the branch hole to cover the inner peripheral edge portion of the branch hole. In addition, the inner tube is positioned at the insertion portion without dropping into the tube body by the locking protrusion that prevents the inner tube from dropping into the branch hole. Then, the branch pipe connecting pipe is inserted into the insertion portion, and the branch pipe connecting pipe and the inner pipe are screwed together. At this time, in the branch pipe connecting pipe, the flange portion formed in the branch pipe connecting pipe comes into contact with the end edge of the insertion portion.
The inner tube will be pulled up. As a result, the close contact portion that covers the inner peripheral edge of the branch hole is in close contact with the inner peripheral edge of the branch hole.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 (a) is a partial cutaway side sectional view showing the outline of the overall configuration of a branch connection pipe joint (hereinafter, simply referred to as a pipe joint), FIG. 1 (b) is the same partial cutaway front view, and FIG. ) Is a plan view of the same, and FIG. 4D is a cross-sectional view taken along line I-I of FIG.

That is, this pipe joint 1 is particularly suitably used for connecting a branch pipe (not shown) to the peripheral wall of the ribbed pipe 2, and has a receiving port 14 for receiving the end of the branch pipe.
12, an inner pipe 16 attached to a branch hole 22 formed in the ribbed pipe 2, an insert portion 15 into which the inner pipe 16 and the branch pipe connecting pipe 12 can be inserted, and a base end of the insert portion 15. And a saddle portion 11 which is curved so as to substantially follow the outer circumference of the pipe body.

The saddle portion 11 is curved so as to substantially follow the outer circumference of the rib 21 of the ribbed pipe 2, and the above-mentioned branch pipe connecting pipe is provided at a substantially central portion thereof.
An insertion portion 15 into which the 12 and the inner pipe 16 are inserted is provided in a protruding manner. The insertion portion 15 has an inner diameter substantially the same as the outer diameter of the inner pipe 16, and has four grooves in the same direction as the inner pipe 16 is inserted.
151 is provided. The lower end of the groove 151 is reduced in diameter to form a step portion 13. In this embodiment, the groove 15
Although 1 is provided at 4 places, it is not limited to this and may be 2 and 3 places. Further, although the saddle portion 11 has a rectangular shape in the present embodiment, the present invention is not limited to this and may be a square, a circle, an ellipse, or the like.

The branch pipe connecting pipe 12 has a receiving portion 14 for receiving an end portion of the branch pipe (not shown). The receiving portion 14 is formed in a tubular shape having an inner diameter substantially equal to the outer diameter of the branch pipe so that the branch pipe can be fitted and adhered to the inner wall surface thereof. Further, at the lower end portion of the outer peripheral surface of the branch pipe connecting pipe 12, screw threads to be screwed with the inner pipe 16 are threaded to form a screw portion 17. Further, at the upper portion of the screw portion 17, the collar portion 19 is formed along the outer peripheral surface of the branch pipe connecting pipe 12.
Is formed so as to come into contact with the end portion of the insertion portion 15 of the saddle portion 11. The shape of the connecting portion of the branch pipe connecting pipe 12 with the branch pipe may be a rubber ring receiving port or a screw type receiving port, and when the end portion of the branch pipe is formed as a diameter expansion receiving port. May be a plain end outlet.

The inner tube 16 has a locking projection 10 formed on the outer peripheral surface of the upper end thereof so as to be in contact with the step portion 13 in conformity with the groove 151 formed in the insertion portion 15 of the saddle portion 11. Also, this inner pipe
The inner peripheral surface of 16 is formed with a screw portion 18 by threading a screw thread that engages with the screw portion 17 of the branch pipe connecting pipe 12. further,
The opening surface of the lower end portion of the inner pipe 16 is curved so as to match the branch hole 22, and the cylindrical stretchable sheet 3 extends from the lower end portion. This elastic sheet 3 is
It is made of rubber, elastomer, or the like, and is joined to the lower end portion of the inner tube by adhesion or heat fusion. An elastic ring 31 having a diameter larger than that of the branch hole 22 and made of spring steel or plastic is built in the end portion of the elastic sheet 3. That is, in this state, the elastic sheet 3 is expanded by the elasticity of the elastic ring 31 so as to be expandable and contractable in the expanding direction of the branch hole 22. The cross-sectional shape of the elastic ring 31 is preferably a shape that is not easily deformed in the circumferential direction and is easily folded, for example, a flat elliptical shape as shown in FIG.

Next, a method of connecting the pipe joint 1 thus configured will be described.

As shown in FIGS. 3 to 6, first, a branch hole 22 is formed at an appropriate position on the peripheral wall of the ribbed tube 2. The diameter of the branch hole 22 is substantially equal to the outer diameter of the inner pipe 16 of the pipe joint 1.

Next, at the outer peripheral edge of the branch hole 22, the branch hole 22 and the insertion portion
The saddle portion 11 is abutted in a state in which the saddle portion 15 is in communication with the saddle portion 11.

Then, the elastic sheet 3 of the inner pipe 16 is deformed to
16 is inserted into the branch hole 22 from the insertion portion 15.

Then, the stretchable sheet 3 of the inner pipe 16 spreads in the radial direction inside the branch hole 22 and covers the inner peripheral edge portion of the branch hole 22. In this state, the locking projection 10 of the inner pipe 16 is inserted into the insertion portion 15.
It will slide in the groove 151 and will come into contact with the stepped portion 13,
Dropping into the branch hole 22 is prevented. In addition, the inner tube 16 is positioned by the engagement protrusion 10 being aligned with the groove 151.

Then, the branch pipe connecting pipe 12 is inserted into the insertion portion 15, and the screw portion 17 of the branch pipe connecting pipe 12 and the screw portion 18 of the inner pipe 16 are screwed together. At this time, the branch pipe connecting pipe 12 has a collar portion formed on the branch pipe connecting pipe 12.
Since 19 will be brought into contact with the edge of the insertion portion 15, the inner pipe
The inner pipe 16 is pulled up by screwing with the inner pipe 16. As a result, the stretchable sheet 3 covering the inner peripheral edge of the branch hole 22 comes into close contact with the inner peripheral edge of the branch hole 22.

In the present embodiment, the pipe joint 1 is connected to the ribbed pipe 2, but the present invention is not limited to this, and a normal ribless pipe body can be connected.

(Effect of the Invention) As described above, according to the present invention, the tight contact portion is brought into close contact with the inner peripheral edge portion of the branch hole by the screwing of the branch pipe connecting pipe and the inner pipe, so that a reliable water stop can be easily obtained. be able to.

[Brief description of drawings]

1 to 6 show drawings according to the present invention.
FIG. 1A is a side sectional view showing the overall configuration of a branch connection pipe joint,
1 (b) is the same sectional view, FIG. 1 (c) is the same plan view, FIG. 1 (d) is a sectional view taken along the line I-I of FIG. 1 (a), and FIG. 2 (a) is FIG. 2 (b) is a plan view showing the shape of the elastic ring.
Is a sectional view taken along the line II-II of FIG. 2 (a), and FIG. 3 (a) is a partial side sectional view showing a state in which a saddle portion is attached to a ribbed tube,
FIG. 3 (b) is a partial sectional view of the same, FIG. 4 (a) is a partial side sectional view showing a state in which the inner pipe is attached in the state of FIG. 3 (a), and FIG. 4 (b) is the same portion. Sectional view, FIG. 5 (a) is the fourth
FIG. 5A is a partial side sectional view showing a state in which a branch pipe connecting pipe is attached, FIG. 5B is the same partial sectional view, and FIG. 6A is a branch pipe in the state of FIG. 5A. FIG. 6 is a partial side sectional view showing a state in which a connecting pipe is screwed into an inner pipe, FIG. 6 (b) is a partial sectional view of the same, and FIG. 7 is a sectional view showing a connecting state of a conventional branch connecting pipe joint. 1 …… Branch connection pipe fitting 10 …… Locking projection 11 …… Saddle part 12 …… Branch pipe connection pipe 14 …… Receiving part 15 …… Insert part 16 …… Inner pipe 19 …… Collar part 2 …… With rib Pipe (tube) 22 …… Branch hole 3 …… Stretchable sheet (adhesive part)

Claims (1)

[Scope of utility model registration request] 1. A branch connecting pipe joint for connecting a branch pipe to a peripheral wall of a pipe body, the branch pipe connecting pipe connecting an end portion of the branch pipe, and a branch hole formed in the pipe body. An inner pipe, an insertion portion into which the inner pipe and the branch pipe connecting pipe can be inserted, and a saddle portion curved at a base end portion of the insertion portion so as to substantially follow the outer circumference of the pipe body, The pipe is provided with a locking projection for preventing the pipe from dropping into the branch hole, and is provided with a close contact portion which has an elastic ring larger than the diameter of the branch hole and is expandable and contractable in the radial direction of the branch hole. A branch connection pipe joint characterized in that a flange portion which is brought into contact with a side edge of the insertion portion is formed in the branch pipe connection pipe, and the branch pipe connection pipe and the inner pipe can be screwed to each other.