JP4221683B2 - Branch extraction joint and its cutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin branch take-off joint that takes out and pipes a branch pipe without leaking fluid from the existing resin main pipe made of polyethylene or the like through which a fluid such as gas flows, and a main pipe punching cutter used therefor Specifically, the present invention relates to a joint and a cutter that can be formed compactly while ensuring a large flow rate for the main pipe.
[0002]
[Prior art]
Conventionally, there is the one shown in FIG. 8 disclosed in JP-A-3-12087.
This is a horsor having a serrated cutting edge 6 at the tip which is screwed into the female screw of the cylindrical body 4 from the cylindrical body 4 in which the horsor 3 of the branch pipe joint 2 fused to the outer peripheral surface of the resin pipe 1 is housed. The outer peripheral surface side portion of the resin tube 1 which is fused by rotating the operation tool 3 with an operating tool is cut out and drilled with a cylindrical hole saw 3.
[0003]
[Problems to be solved by the invention]
In the conventional branch pipe joint 2, since the hole saw 3 cuts and drills the side part of the resin pipe 1 with the cylindrical cutting edge part 6, when trying to take out a branch with a large flow rate from the resin pipe 1, The diameter of the horusoe 3 must be increased, and when the horuseau 3 becomes larger in diameter, the cylindrical portion 4 becomes larger and the entire joint becomes larger. Since the side of the resin tube 1 is perforated in an arc shape from the top for the joint to be large, the opening area at the necessary inner diameter portion is required for greatly cutting the thick portion 9 of the resin tube 1 in the longitudinal direction. Therefore, it was difficult to take out a large flow rate for the resin pipe 1 even though the resin pipe 1 was greatly sharpened with a large joint.
[0004]
In addition, the conventional branch pipe joint 2 is provided with a male saw 5 having a male screw 5 on the top and a blade 6 having a blade body 6 on the bottom. Is done. For this reason, it is necessary to provide the length of the internal thread of the cylindrical portion 4 as much as the feed length for the hole saw 3 to perforate the resin tube. As a whole, the cylindrical portion 4 must be provided long upward, resulting in a large shape. Further, since the horusoe 3 must be mounted for each branch pipe joint 2, the weight is heavy as a whole and the cost is increased.
Further, the joint 2 is made of resin, and the resin internal thread has a problem in strength, and a jumping phenomenon occurs in which the male thread of the hole saw 3 is screwed into the bore and the resin internal thread of the cylindrical portion 4 is overcome and transmission is not performed. easy. For this reason, it is necessary to lengthen the screwing length of the male screw 5 of the horusoe 3, and if the male screw 5 is lengthened, the female screw length of the tubular body 4 on the joint side must be lengthened, and the entire joint has a large shape. It was.
The present invention solves the above-described problems, and provides a branch take-out joint and its cutter that can form the joint main body and the hole saw small and compact, and can take out a large flow amount without reducing the strength of the main pipe. Is.
[0005]
[Means for Solving the Problems]
Gist of the invention includes a saddle portion for fusing the surface of a synthetic resin binding tube, a branch pipe portion horizontally branches in a direction perpendicular to the central axis of the main pipe from the saddle, and the saddle part and the branch pipe portion a perforated pipe portion that upstanding integrally provided between the inner surface of the perforated tube portion includes a cutting edge provided at the tip end is formed into shape or arcuate cross section U, both sides of the cutting edge parts are cylindrical cutter decorated with a slice holding surface including a side for closing, the synthetic resin binding tube, the upright direction leading cutting edge of the cutter on the outer peripheral surface side of the synthetic resin mains a branched extraction joint fluid perforated the synthetic resin present tract is characterized Rukoto plumbed been Eject from the branch pipe part to cut out the pressed by the side from. Furthermore, the synthesis on the surface of the resin bound tube is attached to the fused branched taken out joints, as lacking being pressed off the sides of the synthetic resin mains from the upright direction on the outer peripheral surface side of the synthetic resin mains A cutter for a branch extraction joint, which has a U- shaped or arcuate cross section and a cutting edge provided at the tip thereof, and a section holding surface including one side closing both sides of the cutting edge. It is a cutter for branch extraction joints characterized by having a cylindrical shape .
[0006]
[Action]
The present invention is configured as described above, and the cross-section of the cutting edge is provided in a U shape or an arc shape so that the cutter cuts out the side portion of the main pipe. Then, press in the upright direction and drill in a pressed state. Therefore, the main pipe side portion is cut out in a U-shape or a semicircular arc shape from the upper portion to the lower portion of the main pipe side portion, and the notched portion substantially opens as it is in the inner diameter portion of the main pipe. For this reason, a large opening hole can be formed with a compact cutter, and the entire joint can be formed compactly without using a large joint as in the case of using a cylindrical cutter.
By further providing a long drilling holes in the tube axis direction using a shape-shaped or arcuate cutter of the cross-section of the cutting edge is co, do not enter a big cut in the axial direction (cutting direction) of the tube, the main The strength is maintained and an opening hole with a large opening area is obtained. Furthermore, the fusion area between the main pipe and the inner surface of the saddle portion of the joint body is not reduced, and the fusion area of the saddle can be sufficiently secured, and the sealing area is also secured. The For this reason, an opening hole having the same diameter as or larger than the diameter of the main pipe can be easily obtained, and therefore, branching out at the same flow rate as that of the main pipe can be easily performed.
[0007]
Further, since it is not necessary to provide a female thread portion on the inner surface of the perforated pipe portion as in the prior art, the joint can be formed compactly and the injection molding operation can be easily performed. In addition, since the cutter has no external thread, it can be made very light and branch piping work can be easily performed. The cutter has a U-shaped cutting edge or a cutting edge with an arcuate cross-section, and the main piece is held in the cutter after being punched by pressing on the other side that closes the U-shaped or arcuate shape. Is done. After the drilling, the section at the time of drilling the main pipe is removed from the drilling pipe part together with the pressing tool while being held in the cutter, and a plug is attached to the inner surface of the drilling pipe part instead of the cutter to close the drilling pipe part.
[0008]
Embodiments of the present invention will be described below with reference to FIGS.
FIG. 1 is a side sectional view showing a branch extraction joint and a branch extraction apparatus according to an embodiment of the present invention, and shows a state in which a saddle portion 21 of the joint is fused to a gas main pipe 40. FIG. 2 is a side sectional view showing a state in which the perforated tube portion is closed with the plug 26 after being perforated with the cutter 30. FIG. 3 is a plan view of the branch extraction joint, FIG. 4 is a sectional view of the cutter, FIG. 5 is a view showing a perforated state, and FIG. 6 is a front view showing the opening 41 of the main pipe after the perforation. The branch extraction joint 20 is made of polyethylene resin, a saddle portion 21 that can be opened to the outer periphery of a polyethylene resin gas main pipe 40, a branch pipe portion 23 that takes out the branch pipe on the side of the saddle portion 21, and the saddle portion 21. and perforated pipe portion 22 upstanding provided between the branch pipe portion 23, consisting of the cutter 30. mounted on the perforated pipe section 22.
[0009]
The inner surface of the saddle portion 21 is embedded with a heating heating wire for fusing to the outer peripheral surface of the gas main tube 40 in the vicinity of the inner peripheral surface, and the heating wire is heated to be integrated with the surface of the gas main tube 40. It comes to be fused. The perforated tube portion 22 has a cutter guide portion 21 a that serves as a guide for the cutter 30, and a cutter 31 having a rectangular outer diameter or a bow-shaped cutter 32 is mounted thereon. A cylindrical plug mounting portion 24 is integrally fused to the upper portion of the guide portion 21a. The shutter device 50 is pressed against the flange portion 25 at the upper end, and the hydraulic pressure is used to press the cutter 30 onto the upper portion of the shutter device 50. A pressing tool 60 is mounted.
[0010]
After the main pipe 40 is drilled using the pressing tool 60, the cutter 30 is pulled up to the upper part of the shutter plate 51 of the shutter device, the shutter plate 51 is closed, and the cutter 30 is replaced by the spindle 61 of the pressing tool 60. A plug 26 indicated by 2 is attached, and the inner surface of the perforated pipe portion 22 is closed. In this state, the shutter device 50 and the pressing tool 60 are removed, the flange 27 is attached to the flange portion 25 as shown in FIG. 7, and the perforated tube portion 22 is completely closed.
[0011]
The cutter 31 shown in FIG. 4 is made of steel having a rectangular cross section, and a tapered cutting edge 33 is formed in a U shape at the tip so that three pieces are cut long in the longitudinal direction of the main pipe 40 and drilled. The other side that closes the U-shape is provided as a section holding surface 34 after perforation, and the whole is provided in a rectangular cylindrical shape. The section holding surface 34 may be provided inside the section holding surface 34 so that the section after the elastic member 35 is attached and perforated in the main pipe does not fall, or the section holding surface 34 is deformed inward so that the section does not fall. It may be held. Further, a drop-preventing projection is provided inside the both-side cutting blades 33 and 33 for holding the section so that it does not fall at both sides of the U-shaped cutting edge 33, and the entire cross section of the cutter 30 has no section holding surface 34. Can be provided.
Although not shown in the drawing, instead of the rectangular cross-section cylindrical cutter 31, an arcuate cutter 32 having a semicircular or semi-elliptical cross section extending in the longitudinal direction may be provided, and the main pipe is provided at the tip of the semicircular arc portion. It is also possible to provide a cutting edge 33 that cuts 40 and drills, and holds the section after drilling at a side 34 that closes the semicircular arc.
[0012]
The upper end surface of the cutter 30 has a mounting portion 36 to be mounted on the spindle 61 of the hydraulic pressing tool 60, and the spindle 61 and the cutter 30 move up and down integrally.
When the cutter 30 is pressed and the U-shaped three-sided or semicircular arc-shaped cutting blade 33 is pressed against the side of the main pipe 40 from the axis and the upright direction, the side surface of the main pipe 40 is pressed as shown in FIG. Perforated in the state. The section of the main pipe 40 after drilling is fitted and held in the cutter cutting edge 33 and the section holding surface 34, and the main pipe side is opened as shown in FIG. Since this opening 41 is shallow in the axial direction from the surface of the main pipe and can be cut long in the longitudinal direction to form the perforated opening 41, a large opening 41 can be formed without reducing the strength of the main pipe 40 opening 41. In addition, since it is not a conventional cylindrical hole saw, it can be perforated with a compact cutter 30, and therefore a branch pipe having a flow rate as large as that of the main pipe can be easily achieved.
[0013]
【The invention's effect】
As described above, according to the present invention, the cross-section of the cutting blade is provided in a U shape or an arc shape so that the cutter cuts out the side portion of the main pipe, and is pressed on the outer peripheral surface of the side section of the main pipe. Perforated. Accordingly, the notched portion substantially opens the inner diameter portion of the main pipe as it is, and a large opening hole can be opened without reducing the strength of the main pipe, and the cutter is compact and the entire joint can be made compact. Furthermore, since a sufficient area of fusion with the joint body can be secured and a large opening can be obtained, the same flow rate as that of the main pipe can be taken out.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a branch extraction joint and the entire apparatus according to an embodiment of the present invention.
FIG. 2 is a side cross-sectional view showing a state in which a perforated tube portion is closed with a plug after being perforated with a cutter.
FIG. 3 is a plan view of a branch extraction joint.
4 is a bottom view of the cutter 30. FIG.
FIG. 5 is a side cross-sectional view showing a state where the cutter 30 punches holes.
FIG. 6 is a front view showing an opening 41 of a main pipe after drilling.
FIG. 7 is a side sectional view showing a state in which a perforated pipe portion 22 after perforation is closed.
FIG. 8 is a side sectional view showing a conventional branch extraction pipe joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 Branch extraction joint 21 Saddle part 21a Guide part 22 Perforated pipe part 23 Branch pipe part 24 Plug mounting part 26 Plug 27 Flange 30 Cutter 31 Square-shaped cutter 32 Semicircular arc-shaped cutter 33 Cutting blade 34 Section holding surface 35 Elastic member 36 Upper end mounting portion of cutter 40 Gas main pipe 41 Opening portion after drilling 50 Shutter device 51 Shutter plate 60 Hydraulic pressing tool 61 Spindle of pressing tool

Claims (2)

Upright between the saddle part to fuse to the surface of the synthetic resin binding tube, a branch pipe portion horizontally branches in a direction perpendicular to the central axis of the main pipe from the saddle, and the saddle and the branch pipe portion a perforated pipe portion are formed integrally,
Wherein the inner surface of the perforated pipe section, cross section and cutting edge provided at the tip end is formed into shape or arcuate U, cylindrical having a section holding surface including a side for closing the sides of the cutting edge The cutter is built in ,
The synthetic resin binding tube, the tip cutting edge of the cutter the synthesis on the outer peripheral surface side of the resin main the pressed from the upright direction is perforated so cutting out the sides of the synthetic resin present pipe branch taken out joints, wherein Rukoto fluid is plumbed been Eject from the branch pipe portion. Drilling synthesis on the surface of the resin bound tube is attached to the fused branched taken out joints, as by being pressed from the upright direction on the outer peripheral surface side of the synthetic resin main cutting away the sides of the plastic main pipe A branch take-off joint cutter,
The cross section is formed in a U- shape or an arcuate shape, has a cutting edge provided at the tip thereof, and a section holding surface including one side that closes both sides of the cutting edge, and is provided in a cylindrical shape. Branch take-off joint cutter.

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