JP2001032975A - Manufacture of tightening band for pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and inexpensive tightening band for a pipe joint, simple and quick in pipe connection, with superior workability and improved seal member adhesion for increased sealing effect. SOLUTION: The middle portion of a band body molding material in the cross direction is formed as an outer periphery wall portion formed part, and one of both ends in the cross direction is formed as a thrust portion formed part and the other as a socket engagement portion formed part. In positions on the thrust portion and engagement portion formed parts in the longitudinal direction, cut portions 26 are provided which reach an outer periphery wall portion 27 or its vicinity. Circular curve is provided between either end of the material in the longitudinal direction and the cut portion 26 by pressing. Opposite curve is provided in a corrugated form in a front view for the outer periphery wall portion 27a between the cut portions 26. The thrust portion and engagement portion formed parts are bent inwardly to the cross direction to form seal thrust portions 24 and socket engagement portions 25 in an inward collar form, which constitute band bodies 15a in a developed condition. Then, tightening flange portions 15b, press-molded separately, are fixed to the circular outer face of the outer periphery wall portion 27 at both ends in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tightening band for a pipe joint.

[0002]

2. Description of the Related Art Conventionally, this type of pipe joint has been disclosed in
One disclosed in Japanese Patent Application No. 0-132166 is known. This pipe joint is used, for example, when piping a main pipe for drainage through each floor in a high-rise building, or when piping a horizontal drawing pipe connected to the main pipe, and the like.
4, as shown in FIG. 15, the pipe end 3a of the other pipe 3 is inserted into the socket 2 of one pipe 1 via the cylindrical sealing member 4 and tightened and connected by the tightening ring 5. I have.

The receiving port 2 has a tapered outer surface 2a on the opening edge side that expands in the tube axis direction. Also,
The seal member 4 has a bulged portion 4b having a tapered outer peripheral surface 4a which is bulged at a port opening end edge side and abuts on the tapered inner surface 2b of the port 2. Further, the tightening ring 5 is a C type that can be fitted around the socket 2 and has a dividing portion 6 at one location in the circumferential direction, and has tightening flange portions 5a and 5b at opposite ends of the dividing portion 6 to separate the ring. The space between the parts 6 can be expanded and contracted. Further, an engagement guide surface 5c and a seal pressing surface 5d which are in contact with a receiving taper outer surface 2a formed of a tapered surface facing the pipe axis direction are formed on an inner peripheral surface of the tightening ring 5, and the pressing ring 5 is provided with the pressing surface. The surface 5d presses the enlarged diameter portion 4b in the tube axis direction.

[0004]

By the way, in the above-mentioned prior art, there is an advantage that the pipes 1 and 3 can be easily and quickly connected to each other by tightening the tightening flange portions 5a and 5b with the bolts 7 and the nuts 8. . However, the tightening ring 5 has a large rigidity because the seal pressing surface 5d has an inward flange shape, and it is difficult to externally fit into the receiving port 2 or expand and contract when the ring is tightened. There is a problem that the adhesion is not good, and the pressing force on the sealing member in the tube axis direction does not work uniformly, so that a reliable sealing function cannot be exhibited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has as its object to facilitate manufacture and reduce costs, to connect pipes easily and quickly, and To provide a method for manufacturing a tightening band for a pipe joint, which has good workability, makes the pressing force in the pipe axis direction to the seal member uniform, improves the adhesion of the seal member, and can enhance the sealing effect. is there.

[0006]

According to the present invention, the following technical measures are taken to achieve the above object. That is,
According to a first aspect of the present invention, a pipe end of the other pipe is inserted into a socket of one pipe via a cylindrical sealing member, and is radially expanded / contracted so as to be externally fitted to an outer periphery of an opening end side of the socket. A method for manufacturing a tightening band in a pipe joint to be tightened and connected by a possible C-shaped tightening band, wherein an intermediate portion in the width direction of a band body molding material made of a metal band plate is defined as an outer peripheral wall portion, and both ends in the width direction. One of the portions is a pressing portion forming portion and the other is a receiving portion engaging portion forming portion, at a suitable position in the longitudinal direction of the pressing portion and the engaging portion forming portion, a cutout portion reaching the outer peripheral wall portion or near it is provided. Between both ends in the longitudinal direction of the material and the notch,
Or between the both ends in the longitudinal direction of the material and the notch portion and between the notch portions, while being curved in the same arc in the same radius of curvature by pressing and the outer peripheral wall portion between the notch portions. Curving in the opposite direction to make it wave-like in front view,
Further, the pressing portion and the receiving hole engaging portion forming portion are bent inward in the width direction to form an inward flange-like seal pressing portion and the receiving hole engaging portion, and after the band body in the expanded state is formed, It is characterized in that fastening flanges separately press-formed are fixed to the outer surfaces of the outer peripheral wall arcs at both ends in the direction.

In this case, since the band body is cut into a material by cutting a metal band plate, the band body is formed integrally and in an expanded state by a press machine, so that the manufacturing is easy and the forming die is simple. Moreover, cost reduction can be achieved. When the expanded fastening band formed by the first invention method is externally fitted to the socket of one of the pipes, the center or left and right pressing portions of the band main body and the opposing inner surfaces of the engaging portions, that is, the engaging portions are engaged. The guide surface and the seal pressing surface are pressed against the tapered outer surface of the receiving port outward flange and the tube axial direction outer end surface or the pressing ring of the sealing member,
An outer peripheral wall portion between the cutout portions may be bent in a direction in which the outer peripheral wall portion extends substantially straight, the two fastening flange portions may be opposed to each other, and may be connected by a connecting member such as a bolt and a nut.

Since the fastening band is provided with a notch reaching the outer peripheral wall, the outer peripheral wall between the notches is easy to bend and can be easily expanded and contracted. Can be quickly performed. Further, the outward flange portion and the sealing member have good adhesion to the outer end surface or the pressing ring, and the pressing force in the axial direction acts uniformly over the entire circumference thereof, so that the sealing effect is reliably obtained. The method for manufacturing a tightening band for a pipe joint according to the second aspect of the present invention includes the step of inserting the pipe end of the other pipe into the socket of one pipe via a cylindrical seal member and opening the end of the socket. A method of manufacturing a tightening band for a pipe joint which is tightened and connected by a radially expandable and contractable C-shaped tightening band externally fitted on a side outer periphery, comprising a metal plate material, formed at a widthwise intermediate portion of a band main body forming portion. A band forming material integrally provided with fastening flange portions at both ends in the longitudinal direction of the formed outer peripheral wall portion is formed with one of the width direction both ends of the outer peripheral wall portion as a pressing portion forming portion and the other formed a receiving port. Notches are provided at appropriate locations in the longitudinal direction of the two forming portions as the portions, and reach the outer peripheral wall portion or near the portion, and between the longitudinal ends of the main body forming portion and the notches, or both longitudinal ends of the band main body forming portion. And the notch And, between the notches, the arc is curved in the same direction with the same radius of curvature by pressing, and the outer peripheral wall forming portion between the notches is curved in the opposite direction to form a wave in a front view, and further pressing. The part and the receiving part engaging part forming part are bent inward in the width direction to form an inward flange-shaped seal pressing part and the receiving part engaging part, and the flange part forming part is formed on the outer peripheral wall of the band main body. It is characterized in that it is bent to the side to form a tightened band in a deployed state.

According to this method, the tightened band in the developed state can be integrally and easily formed by the press machine, and the cost can be reduced because only one press forming die is required. It is possible. In the second invention, a reinforcing portion forming portion is provided on the tightening flange portion forming portion of the band forming material on both sides in the width direction of the tightening portion forming portion, and the reinforcing portion forming portion is attached to the band main body outer peripheral wall. After being bent parallel to the upper part on the outer surface side and inwardly to the opposite side, the reinforcing part can be welded to the band body.

According to this method, a tightening band having a high-rigidity tightening flange can be easily and inexpensively obtained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a pipe joint structure to which a tightening band manufactured by the method of the present invention is assembled. As shown in FIG. 1, this pipe joint structure is configured such that a pipe end 13 a of the other pipe 13 is attached to a tubular end 13 a of a pipe 11 at one end of the pipe 11. The main configuration is such that a C-shaped tightening band 15 which is inserted into the opening end of the receiving port 12 and is externally fitted thereto is tightened and connected by bolts 16 and nuts 17.

Hereinafter, for convenience of explanation, the tube 11 having the socket 12 is referred to as a "female tube", and the tube 13 having the other opening is referred to as a "male tube". The receiving port 12 of the female side pipe 11 has a large diameter portion 12a and an outward flange portion 1 having an enlarged end at the large diameter portion 12a.
2b, a tapered inner surface 18 and a tapered outer surface 19 whose diameter increases toward the receiving end edge are formed on the inner and outer peripheral sides of the outward flange portion 12b. The inner diameter of the large-diameter portion 12a is set between the outer peripheral surface of the male-side tube 13 and the seal member 1.
4 so that the thin cylindrical portion 14a can be interposed.

The sealing member 14 has a thin cylindrical portion 14a.
And an enlarged portion 14b formed in an outward flange shape at one end (outer end in the tube axis direction) and an inward flange portion 14c formed so as to protrude radially inward at the other end (inner end in the tube axis direction). The outer diameter of the enlarged diameter portion 14b is fitted into the receiving port 12 so as to protrude. The enlarged diameter portion 14b of the seal member 14 has a tapered outer peripheral surface 20 that increases in diameter from the thin cylindrical portion 14a toward the outer end in the tube axis direction. The tapered end face 21 is reduced in diameter toward the outer end in the axial direction.
As shown in FIG. 5, a thin pressing ring 22 made of a thin metal plate is fixedly integrated with the outer end surface 14d.

The thin pressing ring 22 is formed by cutting a thin metal plate having a thickness of 0.5 mm to 2.5 mm into a ring shape and pressing it so that the cross-sectional shape thereof becomes substantially "H" -shaped. It is fixed to the tapered end face 21 and the outer end face 14d by an adhesive or baking. The inner diameter D of the pressing ring 22 is larger than the inner diameter d of the sealing member 14 (or the outer diameter of the male side tube 13) by an amount corresponding to the required clearance S.
By the gap S, the inner peripheral end surface of the pressing wheel 22 can be prevented from contacting the outer peripheral surface of the male tube 13.
The gap S is preferably set to 0.5 mm to 2 mm. Thereby, the male side pipe 13 of the sealing member 14
Adhesion to the outer peripheral surface can be ensured, and the sealing effect can be enhanced.

Further, the tapered outer peripheral surface 20 of the seal member 14 comes into close contact with the tapered inner surface 18 of the receiving port 12 so that the sealing effect can be enhanced. The inner peripheral side of the outer end face 14d in the pipe axis direction of the seal member 14 is shown in FIG.
As shown in FIG. 2, the extension is extended to the outer end face of the pressing wheel 22, but this extension may be omitted. The cylindrical portion 14 a of the sealing member 14 is formed on the inner peripheral surface of the large-diameter portion 12 a of the receptacle 12 of the female tube 11 or the male tube 13.
The inner and outer diameters of the tube end 13a are determined so as to be able to come into contact with either one of the outer peripheral surfaces. The inner flange portion 14c of the seal member 14 is provided with the receiving large-diameter portion 12a of the female tube 11.
And the tube end 1 of the male side tube 13
3a is sandwiched between the end faces of the two pipes 11, 1
3 is formed so as to be flush with the inner peripheral surface.

The tightening band 15 is formed by pressing a metal band plate, for example, a stainless steel band plate, as shown in FIG. 2, and as shown in FIG. And fastening flange portions 15b, 15b which are spot-welded to the outer peripheral surface. As shown in FIG. 4, the band main body 15a is formed by cutting off a part of a ring in a circumferential direction to form a C-shape.
Its cross-sectional shape is substantially trapezoidal groove-shaped, and one of the opposing inner peripheral surfaces is a tapered seal pressing surface 24 a that comes into contact with the pressing ring 22.
And an inward flange-shaped receiving port engagement having a tapered engagement guide surface 25a in which the other of the opposing inner peripheral surfaces abuts the outward flange tapered outer surface 19 of the receiving port 12. A portion 25 and an outer peripheral wall 27 connecting the two portions 24 and 25 in the width direction are provided. The pressing portion 24 and the socket engaging portion 25 are provided with two notches 26 that divide it into three equal parts in the circumferential direction so as to reach the outer peripheral wall portion 27. The outer peripheral wall portion 27a is easily bent, and the band main body 15a can be easily expanded and contracted.

The flange portion 15b has the same shape and size as the fixing portion 28 having the same curved surface as the outer peripheral wall surface of the main body 15a.
A fastening portion 29 substantially perpendicular to the fixing portion 28;
29 is provided with a reinforcing portion 30 for connecting an end portion in a width direction, that is, a tube axis direction, and a bolt hole 31 is provided in the fastening portion 29 (one is a U-shaped cutout, the other is a long hole). ing. The two flange portions 15b are fixed to the outer peripheral wall surface of the main body 15a by spot welding 32 such that the fixing portions 29 face the fixing portions 28. In the above pipe joint,
When the male side pipe 13 is inserted and connected to the receptacle 12 of the female side pipe 11, first, a sealing member 14 is fitted into the receptacle 12, and is preferably bonded with an adhesive. The fastening portions 29, 29 are pushed outward to spread each other to increase the separation portion 23, that is, the interval between the fastening portions, so that the outward flange portion 12b of the receiving port 12, the enlarged diameter portion 14b of the seal member 14, and the pressing ring 22 are located on the outer peripheral side. The fastening band 15 is externally fitted so as to be wrapped around.

A bolt 16 having a bolt 16 passed through a bolt hole 31 (a long hole) of one of the tightening portions 29 and a nut 17 screwed into a screw tip thereof is inserted into the bolt hole 31 of the one of the tightening portions 29. 31 (U-shaped cutout hole)
By rotating the bolt 16 in the screwing direction, the two tightening portions 29 are drawn toward each other, the diameter of the tightening band 15 is reduced, and the engaging guide surface 25a is brought into contact with the tapered outer surface 19 of the receiving port 12, and the seal is pressed. The surface 24a is lightly brought into contact with the pressing wheel 22 to temporarily fix it. In addition, if it is made to be shipped from the factory in this temporarily tightened state, the workability at the site such as piping becomes very good.

As described above, the female side tube 1 in the temporarily tightened state
The tube end 13a of the male-side tube 13 is inserted into one of the receiving ports 12, and the inner flange 14c of the sealing member 14 is sandwiched between the inner step 12c of the receiving port 12 and the tip of the pipe end 13a. To Next, the bolt 16 is rotated in the screwing direction,
The band body 15a is guided by the tapered outer surface 19 of the socket 12 and contracts radially inward by moving the two tightening portions 29 of the tightening band 15 toward each other inward.
Since the engagement guide surface 25a of 5a is engaged with the tapered outer surface 19 of the outward flange portion 12b, the thin pressing ring 22 is inward in the tube axial direction by the seal pressing surface 24a of the bunt main body 15a which is in contact therewith. It is pressed in the direction of the receptacle 12.

Therefore, since the seal member 14 is compressed along the pipe axis direction and expanded in the radial direction at the same time, the tapered outer peripheral surface 20 of the expanded diameter portion 14 b is formed on the tapered inner surface 18 of the receiving port 12. The inner peripheral surface of the enlarged diameter portion 14b of the seal member is strongly adhered to the outer peripheral surface of the tube end portion 13a of the male tube 13 while being strongly adhered. In this way, the connection and sealing between the female tube 11 and the male tube 13 can be easily and efficiently performed. According to the structure of the pipe joint, the enlarged diameter portion 14b of the seal member 14 does not directly contact the seal pressing surface 24a of the tightening band 15, so that the circumferential direction between the pressing surface 24a and the pressing ring 22 when the band is tightened. , The circumferential strain of the band body 15a of the tightening band 15 is not directly transmitted to the seal member 14, and therefore, the seal member 14 is provided with an axial pressing force by the pressing ring 22 over the entire circumference. It acts uniformly, ensures a sealing effect, and improves the durability of the sealing member 14.

The female tube 11 of the seal member 14
Also, when the push ring 22 is integrated into the receiving port 12, since the pressing ring 22 is integrated, the positioning of the inner peripheral end face of the pressing ring 22 becomes unnecessary, and the workability and accuracy are greatly improved, and the sealing function can be enhanced. In addition, it is possible to prevent metal-to-metal contact between the inner peripheral end surface of the press wheel 22 and the outer peripheral surface of the male tube 13. FIG. 6 shows a cross section of a main part of another structure example of the pipe joint. The difference from the above-described structure example is that the cross-sectional shape of the press ring 22 is a one-letter type, and the same operation and effect as the above-mentioned structure example. Can be expected. Therefore, the same reference numerals as those in FIG.

FIG. 7 shows a cross section of a main part of still another example of the structure of the pipe joint. What is different from the example of FIG. 5 is that an annular convex portion 14e is formed on the outermost peripheral surface of the enlarged diameter portion 14b of the seal member 14.
Is formed, and the outer peripheral end of the pressing wheel 22 is bent toward the receiving port 12 to form an annular flange 22a.
And the end face of the receiving port 12 sandwiches the annular convex portion 14e, and it is possible to expect substantially the same operation and effect as the structural example of FIG. Therefore, the same components as those of FIG. 5 are denoted by the same reference numerals as those of FIG. 5, and detailed description is omitted.

FIGS. 8 to 10 are views for explaining a first embodiment of a method for manufacturing the tightening band 15 for a pipe joint according to the present invention. As shown in FIG. 8, the band main body 15a cuts a metal band plate, for example, a stainless steel band plate into a required length, and presses both ends in the width direction of the pressing portion forming portion 24.
A cutout portion 26 that reaches the outer peripheral wall portion 27a is provided at a position where the A and the socket engagement portion forming portion 25A are equally divided in the longitudinal direction to form the band body material 33.
Then, the material 33 is bent by a press machine at a position indicated by a one-dot chain line 34 in FIG. 8 so that the pressing part 24 and the socket engaging part 25 are opposed to each other in the width direction and have a trapezoidal groove shape. As shown in FIG. 9, the inner surface of the outer peripheral wall 27 is
b is curved so as to form an arc having the same radius of curvature as the radius of the outermost peripheral end face, and an outer peripheral wall portion 27 between the notches 26 is formed.
a is curved in the opposite direction, and the band main body 15a is formed in an expanded state.

The notch 26 may be provided not to reach the outer peripheral wall portion 27a but to reach the vicinity thereof. The point is that it is only necessary that the pressing portion forming portion 24A and the socket engaging portion forming portion 25A can be bent smoothly during press molding. According to the first embodiment of the present invention, the structure of the press die becomes very simple by molding the band main body into the developed shape shown in FIG.
It can be manufactured easily, accurately and inexpensively. And the band main body 1 formed as shown in FIG.
The tightening band 15 in the unfolded state shown in FIG. 10 is completed by fixing the tightening flange 15b separately press-formed on the outer surfaces of the outer peripheral wall portions 27 at both ends to the both ends by spot welding. Can be done.

Note that the tightening band 15 in the developed state shown in FIG.
When attaching to the receiving port 12, the opposed inner surfaces of the center or left and right curved portions of the band main body 15a, that is, the engagement guide surface 25a and the seal pressing surface 24a are attached to the tapered outer surface 19 and the pressing ring 22 of the receiving port outward flange portion 12b. Pressing, the notch 26
The outer peripheral wall portion 27a may be bent in a direction in which the outer peripheral wall portion 27a extends substantially straight, and the fastening flange portions 15b may be opposed to each other and connected by bolts 16 and nuts 17 as shown in FIG.

FIGS. 11 to 13 show a second embodiment of a method for manufacturing a tightening band for a pipe joint according to the present invention, in which a band main body 15a and tightening flange portions 15b, 15b are integrally formed by press molding. It differs from the first embodiment in that it is molded. As shown in FIG. 11, a band forming material 35 employed in the band forming method according to the second embodiment includes a tightening portion forming portion 29A and a reinforcing portion forming portion 30A which constitute the flange portion 15b. When the material 35 is press-formed, the seal pressing portion forming portion 24A and the receiving hole engaging portion forming portion 25A are positioned at the positions indicated by alternate long and short dash lines 36, 36 in FIG. Similarly, while bending inward in the width direction, the outer peripheral wall portion forming portion 27A is curved in an arc shape. On the other hand, the fastening portion forming portion 29A is formed into an outer peripheral wall portion forming portion 27A.
The bent portion is bent substantially at a right angle in a direction opposite to the bending direction, and the reinforcing portion forming portion 30A is positioned at the position shown by the one-dot chain line 37 in FIG. After being bent substantially at right angles to the opposite inward on the opposite side to be parallel to each other and abutting against the outer surface of the outer peripheral wall 27, the reinforcing portion forming portion 30A is welded 38 to the outer peripheral wall 27 (see FIG. 13). 10), the integrated tightening band 15 in the deployed state as shown in FIG. 10 can be completed.

In the case where the thus-formed unified tightening band 15 is assembled in a state shown in FIG. 12, it is performed in the same manner as the one formed by the method of the first embodiment. it can. Integrated fastening band 1 of second embodiment
According to the molding method of No. 5, only one set of molding dies is required, and a tightening band having a high-strength tightening flange portion can be obtained accurately and easily at a low cost. The number of the cutout portions 26 of the tightening band 15 is two in each of the above embodiments, but may be one, or three or more. Further, the present invention is not limited to the above embodiment.

[0028]

As described above, according to the present invention, the pipe end of the other pipe is inserted into the socket of the other pipe via the cylindrical sealing member, and the outer end of the pipe is inserted into the outer periphery of the open end side of the socket. A method of manufacturing a tightening band in a pipe joint to be tightened and connected by a radially expandable and contractable C-shaped tightening band, wherein a width direction intermediate portion of a band body forming material made of a metal band plate is formed as an outer peripheral wall portion. Part, and one of the two ends in the width direction is a pressing part forming part and the other is a receiving part engaging part forming part, at a suitable longitudinal position of the pressing part and the engaging part forming part, up to the outer peripheral wall part or near it. A notch portion that reaches, between the both ends in the longitudinal direction of the material and the notch portion, or between both ends in the longitudinal direction of the material and the notch portion and between the notch portions, a circle of the same radius of curvature by pressing, Curved in the same direction as the arc, The outer peripheral wall portion between the portions is curved in the opposite direction so as to have a wave shape in a front view, and the pressing portion and the receiving portion engaging portion forming portion are bent inward in the width direction facing inward to form an inward flange seal pressing portion and the receiving portion. Since the engaging portion is formed and the band main body in the unfolded state is formed, the fastening flange portion separately formed by breathing is fixed to the outer circumferential wall of the outer peripheral wall at both ends in the longitudinal direction, so that the manufacturing is easy. In addition, the structure of the press mold can be simplified, and the cost can be reduced and the productivity can be improved.

Further, according to the method of the present invention, it is possible to obtain a high-precision tightening band which is easy and quick to connect the pipes with good workability, and makes it possible to uniformly press the sealing member in the pipe axial direction. As a result, the sealing member can be improved in close contact with the receiving port and the pipe, and the sealing effect can be enhanced.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing one structural example of a pipe joint structure employing a tightening band formed according to the present invention.

FIG. 2 is a front view of the tightening band.

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is an enlarged view of a portion B in FIG. 1;

FIG. 6 is a sectional view of a main part (corresponding to a section B in FIG. 1) showing another structural example of the tightening band.

FIG. 7 is a cross-sectional view of a main part (corresponding to a cross section B in FIG. 1) showing still another structural example of the band.

FIG. 8 is a plan view of a band body forming material in the first embodiment of the pipe joint tightening band manufacturing method according to the present invention.

FIG. 9 is a developed front view of the band main body after press molding is completed.

FIG. 10 is an exploded front view of the completed tightening band.

FIG. 11 is a plan view of a band integrated molding material in a second embodiment of the pipe joint tightening band manufacturing method according to the present invention.

FIG. 12 is a front view showing a fastening portion connected state of a fastening band integrally formed in the second embodiment.

FIG. 13 is a sectional view taken along line CC of FIG. 12;

FIG. 14 is a sectional view showing an example of a conventional pipe joint structure.

FIG. 15 is a front view of a fastening ring in a conventional example.

[Explanation of symbols]

 11 One pipe (female side pipe) 12 Reception port 12b Outer flange 13 The other pipe (male side pipe) 13a Pipe end 14 Seal member 15 Fastening band 15a Band body 15b Fastening flange part 24 Pressing part 24a Seal pressing Surface 24A Pressing portion forming portion 25 Receptacle engaging portion 25a Engagement guide surface 25A Receptor engaging portion forming portion 26 Notch portion 27 Outer peripheral wall portion 27a Outer peripheral wall portion 27A Outer peripheral wall forming portion 33 Band body molding material

Claims (3)

[Claims] 1. The end of one tube is connected to the end of the other tube.
A method for manufacturing a tightening band in a pipe joint, which is inserted through a cylindrical seal member and tightened and connected by a radially expandable and contractable C-type tightening band externally fitted to an outer periphery of an opening end of the socket, The intermediate portion in the width direction of the band body molding material made of a metal band plate is defined as an outer peripheral wall portion, and one of the width direction both ends is defined as a pressing portion forming portion, and the other is defined as a receiving hole engaging portion forming portion, and the pressing portion is formed. A notch is provided at an appropriate position in the longitudinal direction of the engaging portion forming portion and reaches the outer peripheral wall or near the same, and between the both ends of the material in the longitudinal direction and the notch, or both ends in the longitudinal direction of the material and the notch. Between the notch and between the notches, the press is curved in the same direction and the same radius of curvature by pressing, the outer peripheral wall portion between the notches is curved in the opposite direction to form a wave in front view. And the pressing portion and the receiving portion The mouth engaging portion forming portion is bent inward in the width direction to form an inward flange-shaped seal pressing portion and a receiving portion engaging portion, and after the band main body in the unfolded state is formed, the outer peripheral walls at both ends in the longitudinal direction are formed. A method of manufacturing a tightening band for a pipe joint, wherein a separately press-formed tightening flange portion is fixed to an outer surface of the circular arc. 2. The end of one tube is connected to the end of the other tube.
A method for manufacturing a tightening band in a pipe joint, which is inserted through a cylindrical seal member and tightened and connected by a radially expandable and contractable C-type tightening band externally fitted to an outer periphery of an opening end of the socket, A band forming material formed of a metal plate material and integrally provided with fastening flange portions at both longitudinal ends of an outer peripheral wall forming portion formed at a widthwise intermediate portion of the band main body forming portion, the width of the outer peripheral wall portion is provided. One of the two end portions in the direction is formed as a pressing portion forming portion and the other as a receiving port forming portion. Notches are provided at appropriate locations in the longitudinal direction of both forming portions to reach the outer peripheral wall portion or near the same, and both ends in the longitudinal direction of the main body forming portion And between the notches, or between both ends in the longitudinal direction of the band body forming portion and the notches and between the notches, are pressed into a circular arc having the same radius of curvature by the press and in the same direction. The outer peripheral wall forming portion between the notches is curved in the opposite direction to have a wave shape in front view, and the pressing portion and the receiving portion engaging portion forming portion are bent inward in the width direction to inwardly press the seal in the form of an inward flange. Forming a tightening band in an expanded state by forming a tightening flange portion forming portion on the outer peripheral side of an outer peripheral wall portion of the band main body. With band production method. 3. A band forming material is provided with a reinforcing flange forming portion on both sides in the width direction of the tightening flange forming portion, and the reinforcing portion forming portion is provided on the outer peripheral wall of the band main body. 3. The method for manufacturing a tightening band for a pipe joint according to claim 2, wherein the reinforcing portion is welded to the band main body after being bent in the upper side and inwardly facing in parallel.