JP5119024B2 - Branch fitting - Google Patents

Description

  The present invention relates to a branch pipe fitting.

Conventionally, when a branch pipe is attached to a large-diameter main pipe, there is one using a socket with a saddle.
On the other hand, JP 2006-105250 A discloses a locking member (6) provided with two locking claws (4, 5) locked to the periphery of the opening (3) of the sewage main pipe (2). ), A saddle member (7) to be attached to the sewage main pipe (2), and a connecting member (9) for connecting the attachment pipe, and one locking claw (4) is connected to the pivot pin (11). A connection branch pipe pivotally attached to the locking member (6) to be rotatable is provided.
In Japanese Patent No. 3468427, a branch hole (4) is provided in the main pipe (1), and an L-shaped gripping claw (26) of a gripping member (21) is provided to the branch hole (4). Insert it after bending and reducing the diameter, apply the saddle part (25) to the outer peripheral surface of the branch hole (4), and push the cylindrical part for diameter expansion (31) into the gripping member (21). Synthetic resin made by enlarging the holding claws (26) and engaging the locking protrusions (27) in the locking grooves (28) so that the branch pipe (3) is fixed to the main pipe (1). A branch is provided.
Japanese Patent Application Laid-Open No. 5-99389 discloses a plurality of elastic members which are provided with an opening (2a) at one end of a joint (1) and are curved so as to be located on the inner side of the joint as going to the tip. Branch joint joint, mounting pipe and branch connection structure in which a locking piece (2c, 2c) is formed and a barb (2d, 2d) is projected from the outer surface of the tip of the locking piece (2c, 2c) Is provided.
JP-A-4-102792 discloses a branch joint having a receiving port (1) and a slot (2), and a connecting hole (3) of the main pipe (A) at the tip of the slot (2). And a plurality of axial notches (4) for facilitating the diameter reduction of the tip of the difference port (2), and the main pipe (A). Insertion into the gap (2) requires a reduced diameter at the tip of the opening (2), and is performed using a reduced diameter jig (10), and a reduced diameter retaining ring (6) for temporarily maintaining the reduced diameter posture. ) And its coupling locking member (12) are provided so as to be releasable.
JP 2006-105250 A Japanese Patent No. 3468427 JP-A-5-99389 JP-A-4-102792

The connecting branch shown in Patent Document 1 is one of the two locking claws (4, 5) of the locking member (6) locked to the periphery of the opening (3) of the sewage main pipe (2). A claw is turned inward and inserted into the opening (3), and the two locking claws (4, 5) are inserted into the opening at a right angle, and the upper part of the locking member (6) The saddle member (7) is inserted and fixed, and the connecting member (9) for connecting the attachment pipe is screwed to the upper portion of the saddle member (7), and the connection branch pipe is attached using the three members. As a result, there are a plurality of members, and there are problems in the troublesomeness of mounting, manufacturing costs, and the connection strength between the saddle member (7) and the connecting member (9).
The synthetic resin branch pipe shown in the above-mentioned patent document 2 has an L-shaped gripping claw (26) and a saddle portion (25) of the gripping member (21) in the branch hole (4) of the main pipe (1). Gripping and attaching, the diameter-expanding cylinder (31) is pushed into the gripping member (21) to increase the diameter of the gripping claw (26), and the locking ridge (27) extends into the locking groove (28). Since they are attached by fitting, there is a problem that the gripping claw (26) and the saddle portion (25) are easily pulled out by the above-mentioned diameter-expanding cylindrical portion (31) being glazed.
The joint for connecting a junction part, the attachment pipe, and the junction connection structure shown in the above-mentioned Patent Document 3 is provided with a connection hole (3a) of the main pipe (3) by inserting the outlet (4a) of the attachment pipe (4) into the joint. ) On the inner surface side of the edge of the hole edge, and the connecting hole (2) of the main pipe (3) is inserted into the elastic locking piece (2c) between the joint opening (2a) and the collar (2d). 3a) is connected by fitting the edge of the hole, but the strength is weak because it is connected only by locking the burr (3d) and the connection hole (3d), and the mounting pipe (4) There has been a problem in that a dedicated pipe having a pipe tip formed to have the same diameter as the joint outlet (2a) is required.
The branch joint shown in Patent Document 4 has a protrusion edge (5) for locking to the inner wall surface of the connection hole (3) of the main pipe (A) at the front end and a reduced diameter of the front end of the differential (2). By forming a plurality of axial notches (4) for facilitating the process, the projection edge (5) can be elastically locked to the connection hole (3) of the main pipe (A). Opening (2) Diameter reduction jig (10) for reducing the diameter of the tip, diameter reduction holding ring (6) for temporarily holding the diameter reduction posture, and its connection locking member (12), etc. In this case, there is a problem that the strength is weak because the connection is necessary only with the projecting edge (5) and the troublesomeness that always requires a member.

  Therefore, the present invention solves the above-mentioned problems of the prior art, and does not require a plurality of members, so that it is an integrated object, thereby reducing the number of parts, and the mounting work for the branch hole of the main pipe is easy and sufficient. It is an object to provide a branch pipe joint that can be securely attached with strength.

In order to achieve the above object, a branch pipe fitting according to the present invention includes a cylindrical body that is inserted into a branch hole provided in an outer wall of a main pipe and receives the branch pipe, and the cylindrical main body includes a branch of the main pipe. Provided with a collar part seated on the outer wall of the peripheral edge of the hole and a plurality of claw pieces abutting from the inner side on the outer peripheral wall of the branch hole of the main pipe, and sandwiching the outer wall between the collar part and the claw piece A branch pipe fitting adapted to fix the cylindrical body to the main pipe,
The flange portion is integrally formed so as to protrude from the outer wall of the cylindrical main body,
The claw piece pivotally supports at least one of a plurality of claw pieces on the cylindrical main body so that the claw piece can rotate, and a tip end of the claw piece protrudes outward from a lower end of the cylindrical main body when the claw piece is rotated. Configured to contact the periphery of the branch hole from the inside ,
The claw piece pivotally supported by the cylindrical body is pivotally supported by a recess provided on the inner wall surface of the cylindrical body, and the branch pipe is inserted into the branch body when the branch pipe is inserted into the cylindrical body. The first feature is that it is configured to be pushed into the recess and to be flush with the inner wall surface of the cylindrical main body.
The branch connector of the present invention, in addition to the first feature, claw piece is in that you have the same as the thickness of the recess of the cylindrical body and the thickness and second features.
In addition to the first or second feature, the branch pipe fitting of the present invention is characterized in that the claw piece is formed with an arc-shaped claw portion along the inner periphery of the main pipe at the tip . 3 features.
Moreover, in addition to any of the first to third features described above, the branch pipe fitting of the present invention includes a claw piece that temporarily holds the claw piece in a recessed state on the inner wall surface of the cylindrical body. The fourth feature is that means are provided.
In addition to the fourth feature, the branch pipe fitting of the present invention is provided with a temporary fixing means provided on the claw piece for elastically fitting the claw piece into the recess of the inner wall surface of the cylindrical body. The fifth feature is that it consists of a bulging portion.
Further, in the branch pipe fitting of the present invention, in addition to any of the first to fifth features, the cylindrical main body is provided with a regulation step portion for regulating the receiving depth of the branch pipe. This is the sixth feature.
In addition to the sixth feature described above, the branch pipe fitting of the present invention has a pressure receiving step portion that matches the shape of the restriction step portion on the back surface of the claw piece, and the branch pipe is inserted into the cylindrical body. The seventh feature is that the insertion pressure of the branch pipe is received when it has been done.

The branch pipe fitting according to claim 1, further comprising a cylindrical main body that is inserted into a branch hole provided in an outer wall of the main pipe and receives the branch pipe, and the cylindrical main body includes the branch hole of the main pipe. And a plurality of claw pieces abutting from the inside on the outer wall of the peripheral edge of the branch hole of the main pipe, and sandwiching the outer wall between the flange and the claw pieces, thereby the cylinder. A branch pipe fitting for fixing a main body to a main pipe, wherein the flange portion is integrally formed so as to protrude from an outer wall of the cylindrical main body, and the claw piece is at least one of a plurality of claw pieces. So that the tip of the claw piece protrudes outward from the lower end of the cylindrical body and abuts against the periphery of the branch hole from the inside. Because it is configured
Since the branch pipe fitting is composed of a cylindrical main body, a flange portion that is integrally formed by projecting from the outer wall of the cylindrical main body, and a plurality of claw pieces that are also provided on the cylindrical main body, one part You can do it. Therefore, the branch pipe connection work can be performed without preparing each of the plurality of parts, and the manufacturing cost can be reduced and the efficiency of the pipe mounting work can be increased due to the effect of reducing the number of parts.
In addition, at least one of the plurality of claw pieces provided on the cylindrical main body is pivotally supported on the cylindrical main body so that the rotatable claw piece can be connected to the branch hole. By rotating in the direction of the core, the cylindrical body can be easily inserted into the branch hole of the main pipe. Therefore, it is possible to easily attach the cylindrical main body to the main pipe. Moreover, even if the remaining claw pieces are fixed to the cylindrical body in advance, they can be inserted into the branch holes of the cylindrical body, so there is no need to operate many claw pieces. Can be done easily.
After inserting the cylindrical main body into the branch hole of the main pipe, the claw piece pivotally supported by the cylindrical main body is rotated to project the tip end outward from the lower end of the cylindrical main body. It can be brought into contact with the periphery of the branch hole from the inside. Therefore, the mounting work can be easily performed.
In addition, the fixing of the cylindrical main body to the branch hole of the main pipe is performed by sandwiching the peripheral edge of the branch hole of the main pipe with the collar portion and the plurality of claw pieces, so that the fixing can be performed sufficiently firmly and surely and safely. .

According to the branch pipe fitting of claim 1 , the claw piece pivotally supported by the cylindrical body is pivotally supported by the recess provided on the inner wall surface of the cylindrical body, and the branch pipe is When inserted into the cylindrical main body, because it is configured to be flush with the inner wall surface of the cylindrical main body by being inserted into the recess by being pushed by the branch pipe,
Since the nail piece that can be rotated is inserted into the recess until the inner wall surface of the cylindrical body is flush with the insertion of the branch pipe, the nail piece does not interfere with the insertion of the branch pipe. Smooth insertion of the tube can be ensured.
Further, the claw piece is inserted into the recess until the claw piece is flush with the insertion of the branch pipe, thereby ensuring the rotation of the claw piece, and from the lower end of the cylindrical body at the tip of the claw piece to the outside sufficiently. The overhang can be secured. Therefore, the main pipe outer side wall can be more reliably sandwiched between the claw piece and the collar portion.
Of course, the claw piece can be rotated to the overhanging position only by inserting the branch pipe without the temporary fixing means.

According to the branch pipe fitting according to claim 2 , in addition to the function and effect of the configuration according to claim 1 , the claw piece has the same thickness as the concave portion of the cylindrical body.
When the nail piece is pushed by the branch pipe and is inserted into the concave portion of the cylindrical main body, there is no backlash in the concave portion. Therefore, the tip of the claw piece can be stably and reliably brought into contact with the inner side of the outer wall of the peripheral edge of the branch hole.

According to the branch pipe joint device, according to claim 3, in addition to the effects by the configuration recited in claim 1 or 2, claw piece, at its distal end, the claw portion of the arc-shape along the inner periphery of the main pipe Because it is formed
The claw piece can be brought into close contact with the inner side of the outer wall of the peripheral edge of the branch hole of the main pipe by the arc-shaped claw portion at the tip end portion thereof. As a result, it is possible to reliably and stably perform the sandwiching between the collar portion and the claw portion.

According to the branch pipe fitting according to claim 4 , in addition to the operational effects of the configuration according to any one of claims 1 to 3 , the claw piece has a claw piece in the recess of the inner wall surface of the cylindrical body. Since there is a temporary fixing means to hold in the temporary fixed state,
After the cylindrical main body is inserted into the branch hole of the main pipe, it is possible to temporarily hold the claw pieces in the vicinity of the rotated position until the branch pipe is inserted into the cylindrical main body. Therefore, the branch pipe can be smoothly inserted when the branch pipe is inserted. Further, when the branch pipe is inserted, the claw piece can be smoothly rotated to the final rotation position. Therefore, the work can be performed smoothly and reliably.

According to the branch pipe joint device, according to claim 5, in addition to the effects due the arrangement according to claim 4, temporary fixing means is resiliently fitted into the claw piece into the recess of the inner wall of the cylindrical body Because it consists of the bulging part provided in the nail piece,
By simply providing a small bulge on the nail piece, the nail piece can be easily elastically inserted into the recess and temporarily fixed.

According to the branch pipe fitting according to claim 6 , in addition to the operational effects of the configuration according to any one of claims 1 to 5 , the cylindrical body has a regulation stage that regulates the receiving depth of the branch pipe. Part is formed,
The branch pipe can be prevented from penetrating into the main pipe, and the connection depth when the branch pipe is connected to the main pipe can be accurately determined.

According to the branch pipe fitting according to the seventh aspect , in addition to the function and effect of the structure according to the sixth aspect , the claw piece is formed with a pressure receiving step portion that matches the shape of the restriction step portion on the back surface. Since the branch pipe is inserted into the cylindrical body, the insertion pressure of the branch pipe is received.
The claw piece can be reliably rotated by the pressure of the branch pipe that has been inserted, and its tip can be positioned in the direction in which it abuts against the inside of the outer wall of the periphery of the branch hole of the main pipe.

Embodiments of the present invention will be described in detail with reference to the following drawings.
FIG. 1 is a perspective view showing a branch pipe fitting according to an embodiment of the present invention, FIG. 2 is a bottom view of the lower pipe side of the branch pipe fitting of the present invention, and FIG. 3 is a cross-sectional view taken along line AA in FIG. 4 is a cross-sectional view taken along the line BB in FIG. 2, FIG. 5 is an enlarged cross-sectional view showing a temporarily fixed state of the shaft support claw piece, FIG. 6 is a front view of the shaft support claw piece, and FIG. FIG. 8 is a perspective view showing a recess at the lower end of the cylindrical main body.

The branch pipe fitting of the present invention comprises a cylindrical main body 200 attached to the branch hole 110 of the main pipe 100 shown in FIG. A branch pipe 300 shown in FIG. 1 is inserted into the cylindrical main body 200. As a result, the branch pipe 300 is connected to the main pipe 100.
That is, the cylindrical main body 200 is formed as a branch pipe joint for connecting between the branch hole 110 and the branch pipe 300.

The cylindrical main body 200 includes a cylindrical portion 210 and a plurality of claw pieces 220 and 230 and a collar portion 240.
The cylindrical main body 200 is provided with a lower end opening edge 211 at the lower end of the cylindrical portion 210, and the lower end opening edge 211 is provided with the claw pieces 220 and 230 projecting outward.
Further, a collar portion 240 is provided on the outer wall near the lower end of the cylindrical portion 210 of the cylindrical main body 200.
Further, the cylindrical portion 210 of the cylindrical main body 200 is formed with a branch pipe insertion port 212 for receiving the insertion of the branch pipe 300 on the upper end side thereof.
A concave portion 213 is formed on the inner wall surface of the lower portion of the cylindrical portion 210 of the cylindrical main body 200. The recess 213 is a recess opened toward the lower end of the cylindrical portion 210. The recess 213 includes a thick outer wall 213a, a recess groove 213b, and a pair of bearing holes 213c. The claw piece 220 is pivotally supported in the recess 213.
Further, the cylindrical portion 210 of the cylindrical main body 200 is formed with a regulating step portion 214 that regulates the receiving depth of the branch pipe 300 on the inner peripheral wall in the middle thereof. The restriction step 214 is a step for restricting the receiving depth of the branch pipe 300. The branch pipe 300 can be connected to a predetermined position without inserting the branch pipe 300 more than necessary and also preventing the branch pipe 300 from being insufficiently inserted.

In the present embodiment, the plurality of claw pieces 220 and 230 are provided at two intervals in the circumferential direction of the cylindrical main body 200 with an interval of 180 degrees. The shaft support claw piece 220 is used, and the other claw piece 230 is a fixed claw piece 230.
In the present embodiment, the number of claw pieces is two, but the number of claw pieces is not limited to this, and two or more claw pieces can be evenly arranged around the circumference. When all the claw pieces are fixed claw pieces 230, the cylindrical main body 200 cannot be inserted into the branch hole 110 of the main pipe 100. For this reason, at least one is made into the support nail | claw piece 220 to such an extent that the cylindrical main body 200 can be inserted in the branch hole 110 of the main pipe 100. FIG. The number of the shaft support claw pieces 220 provided is not limited.
In addition, the two claw pieces 220 and 230 may both be rotatable and may be provided with a gap of 180 degrees. In this case, the cylindrical main body 200 is held in the state where the pair of rotatable claw pieces 220 and 230 are both housed in the cylindrical main body 200 (the state where they do not protrude outward), and the cylindrical main body 200 is held in the branch hole 110. Can be inserted. Therefore, since the claw pieces 220 and 230 do not get in the way, the cylindrical main body 200 can be inserted straight without tilting with respect to the axis of the branch hole 110. If the cylindrical main body 200 can be inserted without being inclined with respect to the branch hole 110 in this way, an adhesive adhesive such as butyl rubber or a sealing material is applied to the lower surface of the flange 240 provided in the cylindrical main body 200. Even in this case, the collar 240 can be easily and accurately seated at the final seating position without causing the adhesive to adhere to an unwilling place during the work and making the work difficult.

  The fixed claw piece 230 is integrally formed as a claw portion 231 projecting outward from the lower end opening edge 211 of the cylindrical portion 210 of the cylindrical main body 200. The shape of the claw portion 231 is an arc shape along the inner periphery of the main pipe 100. Thereby, it can be made to contact | abut closely along the inner side of the outer wall of the periphery of the branch hole 110 of the main pipe 100. FIG.

The pivot support claw piece 220 is pivotally supported by a recess 213 formed on the inner wall surface of the cylindrical main body 200 and is rotatable.
That is, the shaft support claw piece 220 is supported by the bearing holes 213c provided on the both side walls of the upper portion of the recess 213 by the shaft pins 224 provided on the both side portions of the upper portion thereof.
A claw portion 221 projecting outward in a substantially right angle direction is formed at the tip end portion (lower end portion) of the shaft support claw piece 220. The shape of the claw portion 221 is the same as that of the fixed claw piece 230 described above. That is, the shape of the claw portion 221 is an arc shape along the inner periphery of the main pipe 100. As a result, it is possible to make a close contact along the inner side of the outer wall of the peripheral edge of the branch hole 110 of the main pipe 100.
When the branch pipe 300 is inserted, the shaft support claw piece 220 is pushed into the concave part 213 by being pushed by the branch pipe 300 and is flush with the inner wall surface of the cylindrical main body 200 (cylindrical part 210). It is pivotally supported.
Moreover, the thickness of the shaft support claw piece 220 is made the same as the thickness (depth) of the recess 213. As a result, when the shaft support claw piece 220 is fitted into the recess 213, it is accommodated in the recess 213 without excess or deficiency and is flush with the inner wall surface of the cylindrical main body 200 (cylindrical portion 210). In this state, the above-described claw portion 221 protrudes outward from the lower end of the cylindrical main body 200 and just contacts the inner side of the outer wall of the peripheral edge of the branch hole 110. Since the shaft support claw piece 220 is accommodated in the recess 213 without excess and deficiency and is flush with the surface, the shaft support claw piece 220 is prevented from rattling, so that the claw portion 221 can be reliably secured to the outer wall of the main pipe 100 at the periphery of the branch hole 110. Is reliably prevented from coming off or coming off. Further, the breakage resistance strength of the shaft support claw piece 220 is sufficiently improved.

  The shaft support claw piece 220 is provided with a bulging portion 222 as a temporary fixing means. The bulging portion 222 is formed as an arc-shaped convex band that bulges toward the concave portion 213 on the claw piece 220. A recessed groove 213 b is formed in the recessed portion 213 corresponding to the bulging portion 222. The bulging portion 222 is elastically fitted in a state where it slightly enters the recess groove 213b. As a result, the shaft support claw piece 220 is temporarily fixed to the recess 213.

  The shaft support claw piece 220 is formed with a pressure receiving step portion 223 on the back surface thereof. The pressure receiving step 223 is formed to match the shape of the regulation step 214 of the cylindrical portion 210 of the cylindrical main body 200 described above. When the branch pipe 300 is inserted into the cylindrical portion 210, the pressure receiving step 223 receives the tip of the branch pipe 300, thereby receiving the insertion pressure and securely rotating the pivot support claw piece 220. Then, the shaft support claw piece 220 is fitted into the recess 213 in a flush manner, and the claw portion 221 is brought into contact with the inside of the outer wall of the periphery of the branch hole 110.

  The concave portion 213 is formed by thickening the outer wall of the cylindrical portion 210 serving as the back surface of the concave portion 213 as a thick outer wall portion 213a in a shape corresponding to the shape of the concave portion 213. By making only the portion of the recess 213 a thick outer wall portion 213a, material can be saved.

The flange 240 provided on the outer wall near the lower end of the cylindrical portion 210 of the cylindrical main body 200 is integrally formed so as to protrude from the side peripheral wall of the cylindrical portion 210. The shape of the collar portion 240 is a saddle shape so as to follow the shape of the outer wall of the main pipe 100. As a result, the collar portion 240 is seated in a state where it closely contacts the outer wall of the peripheral edge of the branch hole 110.
The periphery of the branch hole 110 of the main pipe 100 just enters the gap between the flange 240 and the fixed claw piece 230. Further, the claw portion 221 of the shaft support claw piece 220 projects outward from the lower end of the cylindrical main body 200, so that the periphery of the branch hole 110 of the main pipe 100 is sandwiched between the flange portion 240 and the shaft support claw piece 220. become.

  A sealing material can be applied to the lower surface of the flange portion 240 (the surface seated on the outer wall of the main pipe 100) in order to improve adhesion and waterproofness. Moreover, when it is made to sit down, it can be made to adhere | attach with an adhesive agent.

In the above configuration, the joining operation of the branch pipe 300 will be described.
First, the position of the main pipe 100 to which the branch pipe 300 is connected is determined, and a branch hole 110 that matches the outer diameter of the lower end opening edge 211 of the cylindrical main body 200 is opened by a hole saw or the like.
Next, in a state where the pivoting claw piece 220 of the cylindrical main body 200 is rotated inward, the cylindrical main body 200 is inserted into the branch hole 110, and the collar portion 240 is attached to the outer wall on the periphery of the branch hole 110. Sit down and complete the insertion.
Further, the pivot support claw piece 220 is rotated outward to be in a temporarily fixed state.
In this state, the receiving posture of the branch pipe 300 is adjusted.
Next, the branch pipe 300 is inserted into the cylindrical main body 200. The distal end of the branch pipe 300 abuts against the shaft support claw piece 220 and pushes to push the shaft support claw piece 220 into the recess 213. When the tip of the branch pipe 300 reaches the pressure receiving step portion 223 of the pivot support claw piece 220 and further reaches the regulation step portion 214 of the cylindrical main body 200, the further penetration of the branch pipe 300 is stopped and the connection is completed. To do. At this time, the claw portion 221 of the shaft support claw piece 220 comes into contact with the periphery of the branch hole 110 from the inside. Thereby, the installation of the cylindrical main body 200 as the branch pipe connector is completed simultaneously with the completion of the piping work (connection work) of the branch pipe 300.

Note that an adhesive may be applied to the inner wall of the cylindrical portion 210 of the cylindrical main body 200 so that the two are bonded in a state where the branch pipe 300 is received.
In addition, an O-ring or other rubber ring mounting portion may be provided in the inner hole of the cylindrical portion 210 of the cylindrical main body 200 to ensure watertightness of the connection with the branch pipe 300.

It is a perspective view of the branch pipe coupling tool which concerns on embodiment of this invention. It is a bottom view of the lower end side of the branch pipe fitting of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is an expanded sectional view which shows the temporarily fixed state of a shaft support claw piece. It is a front view of a shaft support claw piece. It is a perspective view which shows a shaft support claw piece. It is a perspective view which shows the recessed part of the lower end of a cylindrical main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Main pipe 110 Branch hole 200 Cylindrical main body 210 Cylindrical part 211 Lower end opening edge 212 Branch pipe insertion port 213 Recessed part 213a Thick outer wall part 213b Recessed groove 213c Bearing hole 214 Regulation | regulation step part 220 Shaft support claw piece 221 Claw part 222 Swelling part 223 Pressure receiving step portion 224 Shaft pin 230 Fixed claw piece 231 Claw portion 240 Hook portion 300 Branch pipe

Claims (7)

A cylindrical main body is inserted into a branch hole provided in the outer wall of the main pipe and receives the branch pipe. The cylindrical main body has a flange seated on the outer wall of the peripheral edge of the branch hole of the main pipe, A branch pipe fitting provided with a plurality of claw pieces abutting from the inside on the outer peripheral wall of the peripheral edge of the branch hole, and fixing the cylindrical body to the main pipe by sandwiching the outer wall between the collar part and the claw piece Because
The flange portion is integrally formed so as to protrude from the outer wall of the cylindrical main body,
The claw piece pivotally supports at least one of a plurality of claw pieces on the cylindrical main body so that the claw piece can rotate, and a tip end of the claw piece protrudes outward from a lower end of the cylindrical main body when the claw piece is rotated. Configured to contact the periphery of the branch hole from the inside ,
The claw piece pivotally supported by the cylindrical body is pivotally supported by a recess provided on the inner wall surface of the cylindrical body, and the branch pipe is inserted into the branch body when the branch pipe is inserted into the cylindrical body. A branch pipe fitting, wherein the branch pipe fitting is configured to be inserted into the recess when pressed and to be flush with an inner wall surface of the cylindrical main body . The branch pipe fitting according to claim 1, wherein the claw piece has the same thickness as the thickness of the concave portion of the cylindrical main body . The branch pipe fitting according to claim 1 or 2 , wherein the claw piece is formed with an arc-shaped claw part along an inner periphery of the main pipe at a tip part thereof . The branch pipe fitting according to any one of claims 1 to 3, wherein the claw piece is provided with a temporary fixing means for holding the claw piece in a temporarily fixed state in a concave portion of the inner wall surface of the cylindrical main body. . The branch pipe joint according to claim 4 , wherein the temporary fixing means includes a bulging portion provided in the claw piece so as to elastically fit the claw piece into the concave portion of the inner wall surface of the cylindrical main body. Ingredients. 6. The branch pipe coupling device according to claim 1, wherein a regulation step portion for regulating a receiving depth of the branch pipe is formed in the cylindrical main body . The claw piece is formed with a pressure receiving step portion that matches the shape of the regulation step portion on the back surface, and receives the insertion pressure of the branch pipe when the branch pipe is inserted into the cylindrical body. The branch pipe fitting according to claim 6 , wherein

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