WO2018179680A1

WO2018179680A1 - Pipe joint, rectangular electric wire pipe, and pipe joint connection structure

Info

Publication number: WO2018179680A1
Application number: PCT/JP2018/000808
Authority: WO
Inventors: 泰樹木村; 小澤　聡; 中島　裕造
Original assignee: 古河電気工業株式会社
Priority date: 2017-03-31
Filing date: 2018-01-15
Publication date: 2018-10-04
Also published as: AU2018243151A1; AU2018243151B2; MY194814A

Abstract

A pipe joint 1 for a rectangular electric wire pipe mainly comprises a joint body 3 and a Π-shaped fixing member 5. The Π-shaped fixing member 5 comprises a top surface portion 7 and a pair of leg portions 9. A small diameter portion fixing portion 2 is formed on one side of the joint body 3. The small diameter portion fixing portion 2 is a part for fixing a pipe body small diameter portion of a rectangular electric wire pipe described below. A male fitting portion 4 is formed on the other side of the joint body 3. The male fitting portion 4 functions as a fixing portion for a female fitting portion of the rectangular electric wire pipe described below. A connection wall 34 perpendicular to the pipe axis direction of the joint body 3 is formed between the small diameter portion fixing portion 2 and male fitting portion 4 of the joint body 3. That is, the small diameter portion fixing portion 2 and the male fitting portion 4 are connected to each other at the connection wall 34.

Description

Pipe Joint, Connection of Square Conduit and Pipe Joint

The present invention relates to a pipe joint for a rectangular electric pipe and a connection structure of a rectangular electric pipe and a pipe joint for connecting the rectangular electric pipes through which electric wires are inserted.

For example, as a wire protection tube for underground burial, a rectangular wire tube having a round wire tube with a circular cross section and a rectangular cross section has been proposed. Until now, round conduits have been used in many cases, but square conduits with a square cross-section are used as conduits used in tunnels where the conduit laying area is narrow during construction. It was used. The rectangular conduit is a corrugated conduit in which a square cross section and a circular cross section are alternately formed in order to impart flexibility.

In addition, when digging a road and laying conduits, if a rectangular conduit is used, a plurality of adjacent conduits can be placed in contact with each other and embedded, so a conduit having a circular cross section Compared to laying, it has a feature that the amount of excavation of earth and sand is small and construction is easy.

A pipe joint for a rectangular electric conduit is used to connect such rectangular electric conduits. For example, a pipe joint having a joint body made of a synthetic resin and flange edges projecting in the outer circumferential direction from both end portions of a semicircular arc has been proposed (Patent Document 1).

The joint body of the pipe joint of Patent Document 1 has a recessed groove for receiving a watertight packing at a portion between the two sides except for both lateral edges in the width direction. By tightening the bolt holes for tightening at both ends in the circumferential direction of the joint body, the joint body provided with the watertight packing can be fixed to the synthetic resin corrugated pipe. According to the pipe joint of Patent Document 1, even in the case of a rectangular electric conduit, connection is possible.

In addition, a pipe joint is formed by inserting a corrugated pipe end portion having a convex portion whose cross section in the pipe radial direction is substantially square into a fitting cylindrical portion whose cross section in the pipe radial direction in the pipe joint is substantially square, and connecting these It is proposed (patent document 2).

In the pipe joint of Patent Document 2, a hooking piece made of a thin metal plate is provided on the inner wall surface of the fitting cylinder. The convex portion of the corrugated tube pushes the locking piece outward against the elastic force, thereby permitting insertion of the corrugated tube into the fitting cylindrical portion. At this time, the retaining piece is fitted into the gap between adjacent convex portions of the corrugated tube inserted into the fitting cylindrical portion by its elastic return force and engaged with the convex portion, whereby the fitting cylinder of the corrugated tube It is possible to prevent the removal from the department. For this reason, while being able to prevent the omission of a corrugated pipe certainly, connection work can be simplified and the extension to the outward direction from the convex part of a corrugated pipe can be suppressed as much as possible.

In addition, a pipe joint using a retaining ring formed by connecting a plurality of retaining members in the circumferential direction and providing a hook that protrudes on the outer peripheral surface of the ring is proposed (for example, Patent Document 3) .

In Patent Document 3, a retaining ring formed by connecting a plurality of retaining members in the circumferential direction is mounted in a recess of the outer peripheral surface of a tube end of a corrugated synthetic resin pipe. The pipe joint is provided with a socket made of synthetic resin for receiving the pipe end of the corrugated synthetic resin pipe in a state in which the retaining ring is mounted. Further, a through hole is formed in the peripheral wall of the socket portion at a position corresponding to the retaining claw of the retaining ring. In the pipe joint of Patent Document 3, when the pipe end of the corrugated synthetic resin pipe is inserted, the hooking claw engages with the opening edge of the through hole, thereby functioning as a retention prevention of the corrugated synthetic resin pipe.

In addition, it is also possible to use a half-shaped joint member having a substantially rectangular outer shape. In this case, the joint member is formed so as to integrally cover the large diameter portions opposed to each other across the small diameter portion of the electric pipe. A fitting foot portion is provided at one fitting end portion of the half-split joint member, and can be fixed to each other by fitting the foot portion in a groove formed at the other end portion. A water-expandable non-woven fabric may be attached to the inner peripheral surface of the small diameter portion of the joint member.

In addition to this, a pipe joint with a flat spring installed on the inner surface on the opening side of the rectangular cylindrical part of the pipe joint (Patent Document 4) or a tube is press-fit into one end, There is a pipe joint (patent document 5) which connects a pipe by helically rotating and screwing a pipe to the end of the. Furthermore, there is a pipe joint having a fixed part in which a locking member and a plate spring are built in the pipe joint on one side and a bell mouth on the other (Patent Document 6).

JP, 2000-337573, A JP, 2005-172233, A JP, 2010-270879, A JP, 2009-250309, A JP 2004-007996 A JP 2007-037266 A

However, in the method of using a bolt as in Patent Document 1, the connection operation is troublesome. For this reason, there is a need for a pipe joint which can be fixed to a conduit by one touch without using bolts and nuts and which is not easily detached.

Moreover, the pipe joint of Patent Document 2 has a complicated retaining mechanism, and can not be easily fixed to a conduit with one touch, and when manufacturing the pipe joint, fixing of the hooking piece to the pipe joint is troublesome. is there. In addition, when a large pulling force is applied to the pipe joint, there is a possibility that the connection between the pipe joint and the hooking piece may buckle.

Further, in Patent Document 3, the locking claw is formed at the end of the corrugated tube to be inserted, but as in Patent Document 2, since the locking claw is used, when a large pulling force is applied to the pipe joint There is a possibility that the connection between the pipe joint and the hooking piece may buckle.

In such a structure, it is necessary to provide a barbed portion at the tip of the fitting foot, and since this barbed portion protrudes outside the contour of the pipe joint, the pipe joint receives an external impact or the like. , The fitting may come off.

Further, as in Patent Document 4 and Patent Document 6, the method using a leaf spring makes the mechanism complicated. Moreover, the pipe joint of patent document 5 can connect only what with the unevenness | corrugation formed helically.

The present invention has been made in view of such problems, and has a simple structure without using a bolt and a nut, and a pipe joint and a corner which can be connected to a small diameter portion of a rectangular electric conduit with one touch. It is an object of the present invention to provide a connection structure of an electric conduit and a pipe joint.

In order to achieve the above-described object, according to a first aspect of the present invention, a plurality of substantially rectangular shapes are formed on the outer peripheral surface of the tube between a male fitting portion and a female fitting portion formed at an end of the tube. At least one side of a rectangular conduit in which a tube large diameter portion as a peak and a tubular small diameter portion as a circular valley are alternately formed is cut by the tube small diameter portion, and the rectangular conduit The pipe joint comprises a joint body and a hook-shaped fixing member, and the hook-shaped fixing member is connected so as to be substantially orthogonal to the top surface and the top surface. And a stepped portion projecting outward from the connection portion between the two legs and the top surface, respectively, is formed below the top surface. A small diameter portion fixing portion for fixing the small diameter portion of the tube is formed on at least one side of the main body, and the small diameter portion fixing portion is formed of the small diameter portion fixing portion. There is a tubular portion into which the large diameter portion of the tubular body disposed on both sides of the small diameter portion of the tubular body is inserted, and a cylindrical portion disposed further to the back of the tubular portion. And a notch is formed in a part of the cylindrical portion, the upper side of the side surface of the substantially rectangular portion being open and the top surface being opened, and the wedge-shaped fixing member is inserted into the notch from above The stepped portion of the wedge-shaped fixing member is placed on the upper side surface of the cylindrical portion which is notched, and the two legs of the wedge-shaped fixing member are on both sides of the bottom of the cylindrical portion of the joint body. The pipe joint is characterized in that the wedge-shaped fixing member is fixed to the joint main body by being inserted into the opening provided in.

An engagement step may be formed on the inner side of the cylindrical portion at a position corresponding to the notch of the joint body.

An engagement portion is formed at a predetermined position below the step portion of the wedge-shaped fixing member toward the outside of the two foot portions, and the engagement step portion and the engagement portion are engaged with each other in the vertical direction. You may agree.

The inner peripheral surface of the top surface portion of the wedge-shaped fixing member may have a substantially arc shape or an arch shape.

It is desirable that the two legs do not protrude from the outer surface of the bottom when the two legs of the hook-shaped fixing member are inserted into the opening of the small diameter part fixing portion of the joint body.

A water blocking member may be disposed on the small diameter portion fixing portion of the joint main body on the back side of the notch portion so as to surround the entire inner peripheral surface of the cylindrical portion.

The small diameter portion fixing portion and the cylindrical portion for fixing the small diameter portion of the pipe are formed on both sides of the joint main body so as to be symmetrical to each other, and to the notches of the respective cylindrical portions A mold fixing member may be respectively inserted to fix the wedge-shaped fixing member to the joint body.

A male mold which has the small diameter portion fixing portion for fixing the small diameter portion of the pipe and the cylindrical portion on one side of the joint body, and is fixed to a female fitting portion on the other side of the joint body A fitting part may be formed.

The male fitting portion includes a pair of locking walls spaced apart in the axial direction of the tube, and a ring member disposed in a region between the locking walls, the ring member being a ring member The ring member is substantially C-shaped and partially cut in the circumferential direction, and the ring member extends circumferentially with respect to the reduced diameter portion on one end side of the ring member and the reduced diameter portion. And a plurality of claws juxtaposed to be separated from each other via a slit, wherein the claws are gradually expanded so that the outer diameter gradually increases from the reduced diameter portion toward the tip, The ring member is disposed such that the tip end of the claw portion is located on the back side of the pipe body, and the reduced diameter portion is located on the tip end side of the pipe body. A large diameter portion is formed on the tip end side of the tubular body, and a small diameter portion is formed on the proximal side of the tubular body in a region sandwiched by the locking walls, An inclined surface portion is formed between the diameter portion and the small diameter portion, and the ring member has a clearance between at least one of the locking walls, and a region where the ring member is sandwiched by the locking walls , May be slidable in the axial direction of the tube.

The male fitting portion includes a pair of locking walls spaced apart in the axial direction of the tube, and a ring member disposed in a region between the locking walls, the ring member being a ring member The ring member is substantially C-shaped and partially cut in the circumferential direction, and the ring member extends circumferentially with respect to the reduced diameter portion on one end side of the ring member and the reduced diameter portion. A slide guide projecting parallel to the axial direction from the reduced diameter portion to a plurality of claw portions separated from each other via slits and a portion not provided with the claw portions on the circumference of the reduced diameter portion And the claws are gradually enlarged so that the outer diameter gradually increases from the diameter-reduced portion toward the tip, and the ring member is such that the tip of the claw is the portion of the tube body. It is located on the back side, and the reduced diameter portion is disposed to be located on the tip side of the tube, and the region sandwiched by the locking wall is a straight tubular The ring member has a clearance between the ring member and at least one of the locking walls, and the ring member is slidable in the axial direction in a region where the ring member is sandwiched by the locking walls. The movement of the member may be restricted by the slide guide and the locking wall.

One end side connection portion and the other end side connection portion may be formed at both end portions in the circumferential direction of the reduced diameter portion, the respective connection portions may be connected, and the ring member may be formed in a ring shape.

The water blocking member may be a water-expandable non-woven fabric or rubber packing containing polyester fiber, sodium polyacrylate fiber and binder resin.

The joint body and the wedge-shaped fixing member may be made of any of high density polyethylene, polypropylene, ABS resin, PC resin, ABS resin, or polymer alloy of PC resin.

According to the first aspect of the present invention, the square electric conduit and the pipe joint can be fixed only by inserting the wedge-shaped fixing member in a state in which the rectangular electric wire is inserted into the small diameter portion fixing portion of the joint body. For this reason, the pipe joint can be fixed to the rectangular electric conduit with one touch without using a bolt or a nut.

In addition, by forming the engagement step portion at the inner side of the side surface of the cylindrical portion at a position corresponding to the notch portion of the small diameter portion fixing portion, it can function as an engagement portion with the wedge-shaped fixing member. . For example, when the engaging portion is formed at a predetermined position below the step portion of the hook-shaped fixing member toward the outside of the two foot portions, the aforementioned engaging step portion and the engaging portion are engaged with each other in the vertical direction. It can be combined. For this reason, it can function as a retainer of a wedge-shaped fixing member.

Further, by forming the inner peripheral surface of the top surface portion of the bowl-shaped fixing member into a substantially arc shape or an arch shape, the shape can be made to correspond to the circular small diameter portion of the rectangular electric conduit.

In addition, when the wedge-shaped fixing member is inserted into the opening of the small diameter portion fixing portion, the wedge shaped fixing member is configured such that both feet of the wedge shape fixing member do not protrude to the outer surface of the bottom portion of the small diameter portion fixing portion. There is no contact with other members. For this reason, the wedge-shaped fixing member does not come off even when the pipe joint is hit against other members.

Further, by arranging a water blocking member so as to surround the entire inner circumferential surface in the cylindrical portion on the back side of the notch portion, it is possible to ensure water blocking of the gap between the rectangular electric pipe and the pipe joint. .

Further, by forming the small diameter portion fixing portion and the cylindrical portion symmetrically on opposite sides of the joint body, the small diameter portions of the rectangular electric conduit can be similarly fixed on both sides of the joint body. .

Further, by providing the female fitting portion at the other end of the joint body, it can be easily connected to another female fitting portion.

In addition, since the male fitting portion has the ring member and the ring member is disposed on the outer surface of the male fitting portion, the ring member can be easily visually recognized. Further, when fitting the female fitting portion and the male fitting portion, the ring member can move on the large diameter portion of the two-stage structure of the male fitting portion. Furthermore, when the male fitting portion is pushed into the female fitting portion, the end of the female fitting portion eventually abuts against the claw portion of the ring member, whereby the male fitting portion is engaged with the male fitting portion. The mold fitting portion is restrained by the ring member, and the male fitting portion effectively acts on the connection of the rectangular conduit.

In addition, by forming a slide guide that protrudes parallel to the tube axis direction from the reduced diameter portion at a portion where the claw portion of the reduced diameter portion is not provided, the ring member is inclined when mounted on the male fitting portion. In the male fitting portion, it is possible to slide straight in the tube axial direction. The slide guide is engaged with and locked to the locking wall when the ring member slides between the pair of wall portions, so that the ring member does not come off the conduit.

Further, by forming the one end side connection part and the other end side connection part at both ends in the circumferential direction of the reduced diameter part, the ring member can be formed annularly, and the ring member can be prevented from falling off. it can. Furthermore, by adjusting the connection position of the ring member connection portion, it is possible to adjust the circumferential length of the reduced diameter portion of the ring member.

In addition, if a water expansion member or a rubber packing is used as the water blocking member, water blocking can be reliably ensured.

In addition, sufficient rigidity can be obtained by selecting the material of the joint body and the hook-shaped fixing member respectively from any of high density polyethylene, polypropylene, ABS resin, PC resin, ABS resin, or polymer alloy of PC resin. It can be secured.

According to a second aspect of the present invention, the tube joint according to the first aspect includes the tube large diameter portion as a plurality of substantially rectangular peak portions on the outer peripheral surface of the pipe body and a circular valley portion. Connection of the rectangular electric conduit and the pipe joint characterized in that the rectangular electric conduits cut at the small diameter part of the pipe are connected respectively. It is a structure.

According to the second aspect of the present invention, the rectangular small diameter portions of the rectangular small diameter portions of the rectangular small diameter portions are formed by cutting the rectangular small diameter portions together with the rectangular small diameter portions. Can be connected securely.

According to a third aspect of the present invention, there is provided a tubular joint according to the first aspect, wherein the tube large diameter portion as a plurality of substantially rectangular peak portions on the outer peripheral surface of the tube and a circular valley The rectangular electric wire tube cut by the small diameter portion of the tube is connected, and the male fitting of the other end of the pipe joint is connected. In the joint portion, the female side cylindrical portion is formed on the inner peripheral portion of the tubular body, and the female side sloped portion gradually reduces the diameter from the female side cylindrical portion from the tip end side, and the female side sloped portion The female fitting portion including the ring fitting portion expanded from the minimum inner diameter portion is connected.

According to the third aspect of the present invention, it is possible to reliably connect the small diameter portion and the female fitting portion of the rectangular electric conduit, which is cut at the small diameter portion of the pipe and cut.

According to a fourth aspect of the present invention, there is provided a pipe joint according to the first aspect, wherein the tube large diameter portion as a plurality of substantially rectangular peak portions on the outer peripheral surface of the pipe body, and a circular valley The rectangular electric wire tube cut by the small diameter portion of the tube is connected, and the male fitting of the other end of the pipe joint is connected. In the joint portion, the female side cylindrical portion is formed on the inner peripheral portion of the tubular body, and the female side sloped portion gradually reduces the diameter from the female side cylindrical portion from the tip end side, and the female side sloped portion The female fitting portion including the ring fitting portion expanded from the minimum inner diameter portion is connected.

According to the fourth invention, the same effect as that of the third invention can be obtained. Under the present circumstances, when a ring member is attached to a male fitting part by forming a slide guide which protrudes in parallel to a tube axial direction from a diameter reduction part in a portion which does not provide a nail part of a diameter reduction part, ring The member can be prevented from tilting, and the ring member can be slid straight in the tube axial direction in the male fitting portion.

According to a fifth invention, at one end of the pipe joint according to the first invention, the tube large diameter portion as a plurality of substantially rectangular peak portions on the outer peripheral surface of the tube, and a circular valley The rectangular electric wire tube cut by the small diameter portion of the tube is connected, and the male fitting of the other end of the pipe joint is connected. In the joint portion, the female side cylindrical portion is formed on the inner peripheral portion of the tubular body, and the female side sloped portion gradually reduces the diameter from the female side cylindrical portion from the tip end side, and the female side sloped portion The female fitting portion including the ring fitting portion expanded from the minimum inner diameter portion is connected.

According to the fifth invention, the same effect as that of the third invention can be obtained. At this time, the ring member can be formed annularly by forming the one end side connection portion and the other end side connection portion at both end portions in the circumferential direction of the reduced diameter portion, thereby preventing the ring member from falling off. Can. Furthermore, by adjusting the connection position of the ring member connection portion, it is possible to adjust the circumferential length of the reduced diameter portion of the ring member.

According to the present invention, there is provided a pipe joint capable of connecting with the small diameter portion of the rectangular electric conduit with one touch and a connection structure of the rectangular electric conduit and the pipe joint with a simple structure without using a bolt or a nut. Can be provided.

The disassembled perspective view of the pipe joint 1. FIG. (A) is a side view of the joint main body 3, (b) is a bottom view of the joint main body 3. (A) is a side view of the pipe joint 1, (b) is a cross-sectional view of (a). The assembly perspective view of the fitting 1. (A), (b) is a figure which shows the connection method of the square-shaped electric wire tube 40 and the small diameter part fixing part 2 which were cut | disconnected. (A), (b) is a figure which shows the connection method of the square-shaped electric wire tube 40 and the small diameter part fixing part 2 which were cut | disconnected. 6 (a) is a cross-sectional view taken along the line K-K in FIG. 6 (a), and FIG. 6 (b) is a cross-sectional view taken along the line LL in FIG. 6 (a). The disassembled perspective view of the pipe fitting 1a. The assembly perspective view of the fitting 1a. (A), (b) is a figure which shows the connection method of the cut square-shaped electric conduit 40 each other. (A), (b) is a figure which shows the connection method of the cut square-shaped electric conduit 40 each other. The disassembled perspective view of the pipe fitting 1b. (A) is a side view of the joint main body 3b, (b) is a bottom view of the joint main body 3b. (A) is a side view of the pipe fitting 1b, (b) is a sectional view of (a). The expanded sectional view of male fitting part 4. FIG. The expanded sectional view of other embodiment of the male type fitting part 4. FIG. The partial expanded sectional view of the ring member 6. FIG. The perspective view which shows the ring member 6a. The perspective view which shows the ring member 6b. (A) is a perspective view of the ring member 6c, (b) is an enlarged view of the ring member connection part 63. FIG. The figure which shows the connection method of the male fitting part 4 and the female fitting part 43. FIG. (A), (b) is a figure which shows the connection method of the male fitting part 4 and the female fitting part 43. FIG. (A) is a figure which shows the connection method of the male fitting part 4 and the female fitting part 43, (b) is a figure which shows the connection structure 10 of the male fitting part 4 and the female fitting part 43. . The figure which shows the other connection structure 10 of the male fitting part 4 and the female fitting part 43. FIG. The figure which shows the other connection structure 10 of the male fitting part 4 and the female fitting part 43. FIG.

Hereinafter, a pipe joint 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a pipe joint 1. The pipe joint 1 for a rectangular electric conduit mainly comprises a joint body 3 and a hook-shaped fixing member 5. In the present embodiment, only one end side of the pipe joint 1 is illustrated. That is, in the present embodiment, a small diameter portion fixing portion 2 for fixing a small diameter portion of a pipe described later is formed on at least one side of the joint main body 3, and the other end of the joint main body 3 is not particularly limited.

The wedge-shaped fixing member 5 includes a top surface portion 7 and a pair of two foot portions 9. The two foot portions 9 are connected in the vicinity of both end portions of the top surface portion 7 so as to be substantially orthogonal to the top surface portion 7 and project downward. Step portions 11 are provided on both sides of the wedge-shaped fixing member 5. The step portion 11 is formed downward so that the upper side protrudes in both directions. That is, below the top surface portion 7, step portions 11 projecting outward are formed respectively from the connection portion between the both foot portions 9 and the top surface portion 7. The stepped portion 11 is formed substantially parallel to the tube axis direction of the joint body 3.

An engaging portion 27 is formed at a predetermined position below the step 11 of the hook-shaped fixing member 5 toward the outside of the two foot portions 9. The engagement portion 27 is formed such that the lower side protrudes in both directions. The engaging portion 27 and the step portion 11 are formed substantially parallel to each other.

The inner peripheral surface of the top surface portion 7 of the bowl-shaped fixing member 5 has a substantially arc shape or an arch shape. The shape of the inner peripheral surface of the top surface portion 7 is a shape corresponding to the outer diameter of the small diameter portion of the rectangular electric conduit to be described later.

2 (a) is a side view of the joint body 3, FIG. 2 (b) is a bottom view of the joint body 3, FIG. 3 (a) is a plan view of the joint body 3, and FIG. 3 (b) is FIG. It is a XX sectional view of (a). The small diameter portion fixing portion 2 to which the small diameter portion of the joint body 3 is fixed includes a cylindrical portion 13 and a substantially rectangular cylindrical portion 15. The cylindrical portion 13 is a portion into which a small diameter portion of a rectangular electric conduit to be described later is inserted. Moreover, the cylindrical part 15 is a site | part into which the large diameter part etc. of the square-shaped electric pipe mentioned later are inserted. That is, the small diameter portion fixing portion 2 further includes a cylindrical portion 15 into which a large diameter portion of the pipe body disposed on both sides of the small diameter portion of the tubular body is inserted across the small diameter portion of the tubular electric tube described later And a cylindrical portion 13 disposed on the back side of the main portion 15.

In one part of the cylindrical portion 15, one notch 17 in which the upper side of the side surface 19 of the substantially rectangular portion and the top surface 21 open is formed. Further, an engagement step 25 is formed inside the side surface 19 of the cylindrical portion 15 at a position corresponding to the notch 17 of the joint body 3. The engagement step 25 is formed by a protrusion that protrudes inward substantially in parallel with the tube axis direction of the joint body 3.

Openings 23 are provided on both sides of the substantially rectangular bottom portion 29 of the cylindrical portion 15 of the joint body 3. The opening 23 is formed at a position corresponding to the notch 17 in the tube axis direction of the joint body 3. The opening 23 is capable of inserting the two legs 9 of the hook-shaped fixing member 5.

Further, as shown in FIG. 3 (b), the water blocking member 31 surrounds the entire inner peripheral surface of the cylindrical portion 15 in the cylindrical portion 15 of the joint main body 3 on the back side of the notch 17. Be placed. The water blocking member 31 is, for example, a water expansion member, and in this case, a non-woven fabric including polyester fibers, sodium polyacrylate fibers, and a binder resin is applicable. Further, the water blocking member 31 may be a rubber packing, in which case a groove is formed on the inner peripheral surface of the cylindrical portion 15, and the rubber packing is fitted in the groove.

The joint body 3 and the hook-shaped fixing member 5 are preferably made of any of high density polyethylene, polypropylene, ABS resin, PC resin, ABS resin, or polymer alloy of PC resin.

FIG. 4 is an assembled perspective view of the pipe joint 1. The wedge-shaped fixing member 5 is inserted into the notch 17 from above the joint body 3. At this time, the step portion 11 of the wedge-shaped fixing member 5 is placed on the upper portion of the side surface 19 of the cylindrical portion 15. Further, the tips of both feet 9 of the hook-shaped fixing member 5 are inserted into the openings 23 provided on both sides of the bottom 29 of the cylindrical portion 15 of the joint main body 3. By the above, the hook-shaped fixing member 5 is fixed to the joint main body 3.

In addition, when both feet 9 of the hook-shaped fixing member 5 are inserted into the notches 17, the engaging portions 27 which protrude outward in the side face of both feet 9 and are formed upward, and the notches of the fitting main body 3 An engagement step 25 formed downward is in contact with the inner surface of the portion corresponding to 17. At this time, since the wedge-shaped fixing member 5 is made of resin, the distance between the two foot portions 9 is reduced in diameter by elastic deformation. Further, when the hook-shaped fixing member 5 is inserted to the back of the notch portion 17 and the engagement portion 27 passes over the engagement step portion 25, the diameter of both feet 9 is expanded by elastic force. When the position of the opening 23 matches, the wedge-shaped fixing member 5 is inserted into the opening 23. At this time, the engagement step 25 and the engagement portion 27 are engaged with each other in the vertical direction.

When both feet 9 of the hook-shaped fixing member 5 are inserted into the opening 23 of the joint body 3, the tips of the feet 9 do not protrude to the outer surface of the bottom 29. That is, the length from the step portion 11 of the hook-shaped fixing member 5 to the tips of the two foot portions 9 is equal to or less than the distance from the upper edge portion of the notch portion 17 of the side surface 19 in contact with the step portion 11 to the lower surface of the bottom portion 29 is there. By doing this, it is possible to prevent the tips of the two foot portions 9 from protruding from the bottom portion 29 and coming into contact with other members and the like. Therefore, even in the case where the rectangular electric conduits are stacked, the tips of both foot portions 9 of the hook-shaped fixing member 5 come into contact with the lower rectangular electric conduit etc., and the hook-shaped fixing member 5 is opened by reaction. There is no departure from 23.

Next, a method of connecting the cut rectangular electric conduit 40 and the pipe joint 1 will be described. As shown in FIG. 5 (a), the rectangular electric conduit 40 is provided between a male fitting portion (not shown) and a female fitting portion (not shown) formed at the end of the tube. A plurality of tube large diameter portions 44 as a plurality of substantially rectangular peak portions and a tube small diameter portion 45 as a circular valley portion are alternately formed on the outer peripheral surface of the tube. As described above, by providing the substantially square tube large diameter portion 44, when the rectangular conduits 40 are stacked, the rectangular conduits 40 can be stably arranged.

In the present embodiment, at least one side of the rectangular electric conduit 40 is cut by the small diameter portion 45 of the pipe, and the small diameter portion 45 of the cut pipe and the pipe joint 1 are connected. First, as shown in FIG. 5 (a), the rectangular electric conduit 40 is cut into a predetermined length, and the cut end (tube small diameter portion 45) is made to face the small diameter portion fixing portion 2 of the pipe joint 1. Deploy. Next, the small diameter pipe portion 45 is inserted into the small diameter portion fixing portion 2 of the pipe joint 1 (in the direction of arrow P in the figure).

FIG. 5 (b) is a view showing a state in which the rectangular conduit 40 is inserted into the small diameter portion fixing portion 2. The opening diameter of the cylindrical part 15 is formed in the magnitude | size which can accommodate the large diameter part 44 of a pipe body. Furthermore, the length of the cylindrical portion 15 is formed to be substantially equal to the total length of the pair of large diameter portions 44 of the tube which sandwich the small diameter portion 45 of the rectangular electric tube inserted into the cylindrical portion 15 Ru. Further, the cylindrical portion 13 is formed to be larger than the diameter of the small diameter portion 45 of the rectangular electric wire tube 40 and smaller than the diameter of the large diameter portion 44 of the tube. Further, the length of the circular cross section of the cylindrical portion 13 is formed to be equal to or longer than the length of the small diameter portion 45 of the rectangular electric conduit 40.

By setting the length of the circular cross section of the cylindrical portion in this manner, it becomes possible to connect a rectangular electric wire pipe cut at an arbitrary position of the small diameter portion 45 of the tube.

As described above, the cut portion of the small diameter portion 45 of the rectangular electric conduit 40 is inserted into the cylindrical portion 13 of the small diameter portion fixing portion 2 toward the far side in the tube axial direction and disposed. Further, at least the large-diameter portion 44, the small-diameter portion 45, and the large-diameter portion 44 of the rectangular electric tube 40 are disposed in the order of at least the cylindrical portion 15 of the small-diameter portion fixing portion 2. The tube small diameter portion 45 of the rectangular electric conduit 40 is disposed at the position of the notch portion 17.

Further, as described above, the water blocking member 31 is disposed in the cylindrical portion 15 of the small diameter portion fixing portion 2 at the back side of the notch portion 17 so as to surround the entire inner peripheral surface of the cylindrical portion 15 . Therefore, the inner surface of the small diameter portion fixing portion 2 and the outer surface of the large diameter portion 44 of the tubular electric tube 40 are in close contact with each other through the water blocking member 31 to ensure water repellency.

Next, the wedge-shaped fixing member 5 is inserted into the notch portion 17 from above the small diameter portion fixing portion 2. FIG. 6A is a view showing a state before the insertion of the hook-shaped fixing member 5, and FIG. 6B is a view showing a state after the insertion of the hook-shaped fixing member 5. 7 (a) is a cross-sectional view taken along the line KK in FIG. 6 (a), and FIG. 7 (b) is a cross-sectional view taken along the line LL in FIG. 6 (b).

As shown in FIGS. 6 (b) and 7 (b), the wedge-shaped fixing member 5 is inserted from above into the notch 17, and the step 11 of the wedge-shaped fixing member 5 is formed on the upper side of the cylindrical portion 15. Is placed. That is, the step 11 formed in the upper part of the two foot parts 9 of the wedge-shaped fixing member 5 is brought into contact with the upper part of the side surface of the notch 17 to make the wedge-shaped fixing member 5 It is placed on the upper side surface of the cylindrical portion 15 so as to contact the side surface of the large diameter portion 44 of the pipe 40. In this state, the tips of both feet 9 of wedge-shaped fixing member 5 are inserted into openings 23 provided on both sides of bottom portion 29 of cylindrical portion 15 of small-diameter portion fixing portion 2, and wedge-shaped fixing member 5 has a small diameter It is fixed to the part fixing part 2.

At this time, the inner peripheral surface of the top surface portion 7 of the bowl-shaped fixing member 5 has a shape that matches the circular tube small diameter portion 45 or a shape smaller than the tube large diameter portion 44 and not interfering with the tube small diameter portion 45 Is formed. For this reason, the inner peripheral surface of the top surface 7 of the bowl-shaped fixing member 5 abuts on at least a part of the upper portion of the circular cross section of the tube small diameter portion 45 of the rectangular electric tube 40 or It is possible to make contact so as to cover the tube small diameter portion 45 in a substantially arc shape that is aligned.

When the wedge-shaped fixing member 5 is placed on the upper portion of the side surface of the notch 17, the inner peripheral surface of the top surface 7 of the wedge-shaped fixing member 5 has a large diameter of the tube of the rectangular electric conduit 40 inside. It may be smaller than the portion 44 and larger than the small diameter portion 45 of the rectangular electric conduit 40. In this case, the wedge-shaped fixing member 5 is separated by a predetermined distance so as not to interfere with the small diameter portion 45 of the rectangular electric tube 40, and encloses the upper portion of the circular cross section of the small diameter portion 45 of the rectangular electric tube 40. It becomes shape to cover. That is, the wedge-shaped fixing member 5 inserted into the notch 17 may or may not be in contact with the small diameter portion 45 of the rectangular electric conduit 40. Here, the side surface portion of the top surface portion 7 of the bowl-shaped fixing member 5 has an outer peripheral surface and an inner peripheral surface, has an outer peripheral surface and an inner peripheral surface, and has a rib structure such that the inside surrounded by both is recessed. The top surface 7 may be formed in a bulk shape by forming the side surface portion of the top surface 7 in a planar shape. By forming the top surface portion 7 in a bulk shape in this manner, it is possible to increase the area of the pressure receiving surface that receives the drawing force when the square conduit 40 is subjected to the drawing force.

When the wedge-shaped fixing member 5 is pushed until the step 11 comes in contact with the edge of the notch 17, the engaging portion 27 of the wedge-shaped fixing member 5 engages with the engaging step 25. Therefore, the wedge-shaped fixing member 5 is fixed to the small diameter portion fixing portion 2 and the wedge shaped fixing member 5 does not fall off from the small diameter portion fixing portion 2. Further, as described above, in this state, the tips of the two foot portions 9 of the wedge-shaped fixing member 5 do not protrude to the outer surface of the bottom portion 29 of the small diameter portion fixing portion 2. For this reason, it can suppress that both foot parts 9 contact with other members etc. outside.

When the rectangular electric conduit 40 is to be pulled out of the pipe joint 1 with the wedge-shaped fixing member 5 fixed to the small diameter portion fixing portion 2 in this manner, one of the upper portions of the inner surface of the top surface 7 of the wedge-shaped fixing member 5 The part and both legs 9 abut on and engage with the side surface of the substantially square tube large diameter part 44 of the rectangular electric conduit 40. As described above, since the rectangular electrical conduit 40 and the pipe joint 1 are engaged in the axial direction of the pipe, the angular electrical conduit 40 does not come off the pipe joint 1.

By the above, it is possible to obtain the connection structure 10a in which the pipe small diameter portion 45 of the rectangular electric wire tube 40 cut by the pipe small diameter portion 45 and the pipe joint 1 are connected.

As described above, according to the present embodiment, at one end of the pipe joint 1, the large diameter portion 44 as a plurality of substantially rectangular peak portions on the outer peripheral surface of the pipe 49, and the circular valley portion It is the square electric wire tube 40 in which the tube small diameter parts 45 as are alternately formed, and the rectangular electric wire tube 40 cut by the tube small diameter part 45 can be connected. At this time, fixing of the rectangular electric wire tube 40 cut by the small diameter portion 45 to one end of the pipe joint 1 is performed by fitting the wedge-shaped fixing member 5 and the joint body 3. Therefore, the cut portion of the small diameter portion 45 of the rectangular electric conduit 40 and the pipe joint 1 can be easily connected. At this time, since the connection work is completed with one touch without using a bolt and a nut, the connection work is easy.

Further, in the connecting portion of the rectangular electric conduit 40 to the small diameter portion 45 of the rectangular electric conduit 40, the step 11 is formed in the lower portion of the top surface 7 of the hook-shaped fixing member 5, and the step 11 is in contact with the upper portion of the notch 17. In this case, the insertion margin of the wedge-shaped fixing member 5 can be easily grasped. For this reason, the wedge shaped fixing member 5 is not excessively inserted into the small diameter portion fixing portion 2 and the rectangular electric conduit 40 is not pressed. Moreover, since the step part 11 is formed in both foot parts 9 and the cross section of both foot parts 9 is reinforced, the wedge-shaped fixing member 5 is stable and does not buckle in the axial direction.

In addition, since the tips of the two foot portions 9 of the wedge-shaped fixing member 5 do not protrude from the small diameter portion fixing portion 2 to the outer surface, contact between the two foot portions 9 with other external members is suppressed. For this reason, it can suppress that the foot part 9 is pushed in by the small diameter part fixing part 2, and the wedge-shaped fixing member 5 falls or receives damage. Therefore, even when the pipe joint 1 is hit against other members, the rectangular electric conduit 40 does not come off from the small diameter portion fixing portion 2.

Further, the wedge-shaped fixing member 5 and the small diameter portion fixing portion 2 can be reliably fixed by engaging the engagement step portion 25 with the engagement portion 27. For this reason, the wedge-shaped fixing member 5 does not come off the small diameter portion fixing portion 2.

Further, by arranging the water blocking member 31 on the back side (the cylindrical portion 13 side) of the cylindrical portion 15, the outer peripheral surface of the large diameter portion 44 of the rectangular electric conduit 40 and the cylindrical portion 15 are connected. Between the two, it is possible to ensure the water barrier. For this reason, it is possible to prevent water from entering the cylindrical portion 13.

Further, when the side surface of the tube large diameter portion 44 disposed on the back side of the cylindrical portion 15 comes into contact with the side surface of the wedge-shaped fixing member 5, the rectangular electric conduit 40 is pulled out of the small diameter portion fixing portion 2. There is no At this time, since both feet 9 are inserted into the opening 23, deformation of both feet 9 is suppressed even when a tensile force is applied to the rectangular electrical conduit 40.

Next, a second embodiment will be described. FIG. 8 is an exploded perspective view showing a pipe joint 1a according to a second embodiment, and FIG. 9 is an assembled perspective view of the pipe joint 1a. In the following description, the same reference numerals as in FIGS. 1 to 8 are added to the configurations having the same functions as in the first embodiment, and the redundant description will be omitted.

The pipe joint 1a has substantially the same configuration as the pipe joint 1, but differs in that the small diameter portion fixing portion 2 is formed at both ends of the joint body 3a. That is, the joint main body 3 a has a cylindrical portion 13 at the center and a substantially rectangular cylindrical portion 15 symmetrically arranged in the tube axis direction so as to face each other with the cylindrical portion 13 interposed therebetween. In addition, the cylindrical part 15 of the both ends is the same form symmetrically on both sides of the cylindrical part 13. FIG.

As described above, the notch portion 17 in which the upper side of the side surface 19 of the substantially rectangular portion and the top surface 21 are opened is formed in a part of the cylindrical portion 15. That is, in the pipe joint 1a, two notches 17 are formed at symmetrical positions in the axial direction of the tube with the cylindrical portion 13 interposed therebetween. The wedge-shaped fixing member 5 is inserted into each of the notches 17 from above. That is, in the pipe joint 1a, a pair of wedge-shaped fixing members 5 are used.

Next, a method of connecting the rectangular electric conduit 40 and the pipe joint 1a will be described. The rectangular conduits 40 cut at substantially the center of the small diameter portion 45 of the rectangular conduit 40 are adjusted in length, and are connected by the pipe joint 1 a. First, as shown in FIG. 10A, the rectangular electric conduit 40 is cut into a predetermined length, and the cut end portions (the small diameter portion 45 of the tubular body) are arranged to face each other. Next, the mutually opposing small-diameter portions 45 of the tubular body are inserted from both sides of the joint body 3a of the pipe joint 1 (in the direction of arrow H in the figure).

FIG.10 (b) is a figure which shows the state in which the square shaped conduit 40 was inserted to the both sides of the joint main body 3a. In the cylindrical portion 13 of the joint main body 3a, the cut portions of the small diameter portion 45 of the tubular electric tube 40 are inserted from both sides of the joint main body 3a toward the back side in the pipe axial direction. That is, in the cylindrical portion 13 of the joint main body 3a, the cut end portions of the small diameter portion 45 of the rectangular electric wire tube 40 are disposed to face each other. Further, at least the large diameter portion 44, the small diameter portion 45, and the large diameter portion 44 of the rectangular electric tube 40 are disposed in the order of at least the cylindrical portion 15 of the joint main body 3a. The small diameter portion 45 of the rectangular electric conduit 40 is positioned at the position of the notch 17.

Further, as described above, the water blocking member 31 is disposed in each cylindrical portion 15 of the joint main body 3a on the back side of the notch portion 17 so as to surround the entire inner peripheral surface of the cylindrical portion 15. . Therefore, the inner surface of the joint main body 3a and the outer surface of the large diameter portion 44 of each of the rectangular electric conduits 40 are in close contact with each other through the water blocking member 31 to ensure water proofness.

Next, the wedge-shaped fixing member 5 is inserted into each of the notches 17 from above the joint body 3a. FIG. 11A is a view showing a state before insertion of the wedge-shaped fixing member 5, and FIG. 11B is a view showing a state after inserting the wedge-shaped fixing member 5. As shown in FIG. 11 (b), the wedge-shaped fixing member 5 is inserted from above into the notch 17, and the step 11 of the wedge-shaped fixing member 5 is placed on the upper side of the cylindrical portion 15. In this state, the tips of both feet 9 of wedge-shaped fixing member 5 are inserted into openings 23 provided on both sides of bottom 29 of cylindrical portion 15 of fitting body 3a, and wedge-shaped fixing member 5 is formed of fitting body 3a. It is fixed to.

When each wedge fixing member 5 is pushed until the step 11 contacts the edge of the notch 17, the engaging portion 27 of the wedge fixing member 5 engages with the engagement step 25. At this time, the step portion 11 and the engagement portion 27 of the wedge-shaped fixing member 5 sandwich the side surface of the joint body 3 a from the edge of the notch 17 and both sides of the engagement step 25. Is fixed to the joint body 3a, and the wedge-shaped fixing member 5 does not fall off from the joint body 3a. Further, as described above, in this state, the tips of the two foot portions 9 of the wedge-shaped fixing member 5 do not protrude to the outer surface of the bottom portion 29 of the joint main body 3a. For this reason, it can suppress that both foot parts 9 contact with other members etc. outside.

As described above, the cut portion side of the rectangular electric wire tube 40 cut by the small diameter portion 45 of the pipe is connected by the pipe joint 1a. That is, it is possible to obtain a connection structure 60 of the rectangular electric conduit and the pipe joint in which the pair of rectangular electric conduits 40 are connected by the pipe joint 1a.

According to the second embodiment, the same structure as that of the first embodiment can be realized symmetrically about the cylindrical portion 13. Therefore, the same effect as that of the first embodiment can be obtained. Thus, according to the pipe fitting 1a, it is possible to connect the tube small diameter portions 45 of the pair of rectangular electric conduits 40 with each other.

Next, a third embodiment will be described. FIG. 12 is an exploded perspective view showing a pipe joint 1b according to the third embodiment, and FIG. 13 (a) is a side view of the joint body 3b, and FIG. 13 (b) is a bottom view of the joint body 3b. is there. In the perspective view, the configuration of a ring member or the like described later is omitted.

The pipe joint 1b has substantially the same configuration as the pipe joint 1, but the form of the joint body 3b is different. The small diameter portion fixing portion 2 is formed on one side of the joint body 3b. As described above, the small diameter portion fixing portion 2 is a portion to which the small diameter portion of the tubular electric pipe is fixed. A male fitting portion 4 is formed on the other side of the joint body 3b. The male fitting portion 4 functions as a fixing portion of a female fitting portion of a rectangular electric conduit which will be described later. A connection wall 34 perpendicular to the axial direction of the joint body 3 is formed between the small diameter portion fixing portion 2 and the male fitting portion 4 of the joint body 3 b. That is, the small diameter portion fixing portion 2 and the male fitting portion 4 are connected by the connection wall 34.

Fig. 14 (a) is a side view of the pipe joint 1b, and Fig. 14 (b) is a cross-sectional view of the pipe joint 1b. FIG. 15 is a partial enlarged cross-sectional view of FIG. 14 (b). In addition, about the small diameter part fixing | fixed part 2, since it is the same structure as the pipe joint 1 mentioned above, detailed description is abbreviate | omitted.

The male fitting portion 4 comprises a ring member 6 and a water blocking member 32. The male fitting portion 4 is formed on an outer peripheral portion in the vicinity of one end of the pipe fitting 1b. As shown in FIG. 15, at the end of the male fitting portion 4, the locking wall 8, the ring member placement portion 12, the locking wall 8, the water blocking member housing portion 26, the locking wall 8 in order from the tip. Is formed. In the following description, the opening side (the direction of arrow B in the figure) of the male fitting portion 4 is defined as the tip side of the male fitting portion 4, and the opposite side (the direction of the arrow A in the figure) is male. The base side of the mold fitting portion 4 is defined. The locking wall 8 is a portion where the outer diameter is larger than the surrounding. The pair of locking walls 8 are disposed apart from each other in the axial direction of the tube, and limit the operating range of the ring member 6.

A region sandwiched by the pair of locking walls 8 is a ring member arrangement portion 12 in which the ring member 6 is disposed. That is, the male fitting portion 4 includes a pair of locking walls 8 which are spaced apart in the tube axis direction, and a ring member 6 which is disposed in a region sandwiched by the locking walls 8. The ring member placement portion 12 is composed of a large diameter portion 14, a slope portion 16 and a small diameter portion 18 in order from the tip end side of the male fitting portion 4. That is, the large diameter portion 14 is formed on the tip end side of the male fitting portion 4 in the region sandwiched by the pair of locking walls 8 and the male fitting portion in the region sandwiched by the pair of locking walls 8 A small diameter portion 18 is formed on the base side of 4 and a sloped portion 16 is formed between the large diameter portion 14 and the small diameter portion 18. The outer diameter of the large diameter portion 14 is smaller than the locking wall 8 and larger than the small diameter portion 18.

A water blocking member accommodating portion 26 is provided on the base side of the ring member arranging portion 12. As shown in FIG. 15, the water blocking member housing portion 26 is a groove having a substantially rectangular cross section provided between the two locking walls 8, and the water blocking member 32 is housed in the water blocking member housing portion 26. Be done. That is, the water blocking member 32 is provided further on the base side than the locking wall 8 on the base side of the male fitting portion 4, and the water blocking member 32 is moved on the base side of the water blocking member 32. Another locking wall 8 is provided for regulating and fixing. The water blocking member 32 is an annular member, and the inner diameter of the water blocking member 32 is smaller than the outer diameter of the water blocking member housing portion 26, but the diameter of the water blocking member 32 is expanded and the water blocking member housing portion 26 is Because the water blocking member 32 is attached, the inner surface of the water blocking member 32 is in close contact with the outer surface of the water blocking member housing portion 26.

The water blocking member 32 has a shape in which the inner periphery of the cross-sectional shape is linear (approximately the same diameter in the tube axis direction), and the outer periphery has a slope toward one end from the other end in the tube axis direction . As shown in FIG. 15, the largest outer diameter portion of the water blocking member 32 is disposed toward the base side of the male fitting portion 4, and the outer diameter of the portion is a joint in the male fitting portion 4. The water blocking member 32 projects outward in the radial direction, which is larger than the maximum outer diameter of the main body 3b.

The water blocking member 32 may be, for example, either a rubber or a water expansion member, but in the case where the water blocking member 32 has a shape projecting radially outward as shown in FIG. It is desirable that the water blocking member 32 be made of rubber. When the water blocking member 32 is made of rubber, for example, ethylene propylene rubber (Ethylene Propylene Rubber) can be applied. Ethylene propylene rubber is a type of synthetic rubber obtained by copolymerization of ethylene and propylene. In order to enable vulcanization with sulfur compounds, ethylene propylene rubber is often used as an EPDM rubber copolymerized with a small amount of a diene monomer. Other than these, SBR, CR, NBR, ACM rubber, EPDM / PP dynamically cross-linked elastomer, etc. can also be used.

Although not particularly illustrated, when the water blocking member 32 is formed of a water expansion member, the water blocking member 32 may swell due to water absorption and fill the gap with the female fitting portion or the water blocking member accommodation portion 26. it can. For this reason, in this case, the water blocking member 32 can be provided on the outer periphery of the water blocking member housing 26 in parallel with the tube axis direction without being formed smaller in diameter than the water blocking member housing 26. A nonwoven fabric can be used for a water expansion member. Here, the non-woven fabric can be wound around the outer periphery of the water blocking member housing portion 26, and both ends of the non-woven fabric can be overlapped, and both ends can be adhered to each other with an adhesive or fixed with a tacker or the like. Alternatively, by forming an adhesive layer on one surface of the non-woven fabric, it can be wound and fixed to the water blocking member accommodating portion 26. For example, as the non-woven fabric, non-woven fabric of polyester fiber and sodium polyacrylate can be used. In this case, when the proportion of polyester fiber and sodium polyacrylate is 100% by mass in total, the amount of sodium polyacrylate is from 30% to 70%, preferably from 50 to 70% by mass. .

Here, for the water-expandable nonwoven fabric, for example, it is desirable to use a binder resin which is a low melting point resin in a range of 1 to 10% with respect to the total of both polyester fiber and sodium polyacrylate fiber. More preferably, it is 1 to 5%. For example, as the binder resin, a low melting point polyester can be used, and the formation of the non-woven fabric can be performed by a needle punch method.

The ring member 6 is arranged in the ring member arrangement portion 12. The ring member 6 has a substantially annular shape, and has a substantially C shape in which a part in the circumferential direction is cut at the circumferential end 65 (see FIG. 14).

FIG. 17 is a view showing details of the cross-sectional shape of the ring member 6. One end side of the ring member 6 is a reduced diameter portion 22 whose outer diameter is smaller than that of the other portion. A plurality of claws 24 are provided toward the other end of the ring member 6. The plurality of claws 24 are provided separately from the reduced diameter portion 22 in the circumferential direction via the slits 38 (see FIG. 14A).

Further, the diameter of the claw portion 24 is gradually increased such that the outer diameter gradually increases as it goes from the reduced diameter portion 22 to the tip. That is, the ring member 6 has a tapered portion 33 whose diameter decreases from the tip end of the claw portion 24 toward the reduced diameter portion 22 in the cross section in the tube axial direction. The ring member 6 has an acute-angled wedge shape in which the inner peripheral portion is bent and formed in two steps, and the thickness decreases from the tip of the claw portion 24 toward the reduced diameter portion 22.

As shown in FIG. 15, in the ring member 6, the tip end of the claw portion 24 is positioned on the base side of the male fitting portion 4, and the reduced diameter portion 22 faces the tip end side of the male fitting portion 4. Be placed. Since the inner diameter of the ring member 6 is smaller than the outer diameter of the locking wall 8, the ring member 6 is held between the locking walls 8.

For the ring member 6, for example, any of ABS resin (acrylonitrile butadiene styrene copolymer), PP resin, hard vinyl chloride or a mixed resin or polymer alloy of any of these and PC resin can be applied, and the ABS resin is applied It is desirable to do.

As shown in FIG. 15, the length (C in the figure) of the ring member 6 in the tube axis direction is the length (D in the figure) of the ring member placement part 12, and the large diameter part 14, the sloped part 16 and the small diameter Less than the sum of the lengths of the parts 18 Further, the length (C in the figure) of the ring member 6 in the tube axis direction is longer than the sum (E in the figure) of the lengths of the small diameter portion 18 and the slope 16 and the length of the large diameter portion 14 (in the figure D-E) longer than. Therefore, the ring member 6 has a clearance 28 between it and at least one of the locking walls 8 in the state of being disposed in the ring member placement portion 12. For this reason, the ring member 6 is slidable in the tube axis direction at the ring member arrangement portion 12.

Thus, the reduced diameter portion 22 which is the side end portion of the ring member 6 is attached so as to be positioned on the large diameter portion 14 and slides on the large diameter portion 14. However, since the dimension of the ring member 6 is larger than the sum of the lengths of the small diameter portion 18 and the slope portion 16, the ring member 6 does not enter the small diameter portion 18 and the slope portion 16 as a whole.

Instead of the ring member 6, a ring member 6a shown in FIG. 18 may be used. The ring member 6a has substantially the same configuration as the ring member 6, but differs in that a slide guide 61 is formed. A slide guide 61 is formed from the reduced diameter portion 22 toward the other end at a portion of the ring member 6a where the claw portion 24 is not provided.

The slide guide 61 is not formed so as to expand in diameter from the reduced diameter portion 22 to the other end like the claw portion 24 but is formed substantially parallel to the axial direction of the ring member 6a. Therefore, as shown in FIG. 16, when the ring member 6 a is attached to the male fitting portion 4 of the pipe joint 1, the slide guide 61 protrudes in parallel in the tube axis direction from the reduced diameter portion 22.

In this case, a region sandwiched by the locking wall 8 is formed in a straight tubular shape, and the ring member disposition portion 12 is a substantially cylindrical peripheral surface sandwiched by the locking wall 8. The slide guide 61 protrudes parallel to the axial direction of the tube from the reduced diameter portion 22 toward the other end. Therefore, when the ring member 6 a is attached to the male fitting portion 4, the slide guide 61 protrudes from the reduced diameter portion 22 in the direction of the tube axis in parallel in the straight tubular ring member disposition portion 12. Therefore, the movement of the ring member 6 a is restricted by the slide guide 61 and the locking wall 8.

In addition, you may use the ring member 6b shown in FIG. In the ring member 6b, ring member connection portions 63 are formed at circumferential end portions 65 of the substantially C-shaped member, and the ring member connection portions 63 are formed so as to overlap and connect both ends with each other.

One ring member connecting portion 63 of the ring member 6 b is formed with an adhesive layer having a release paper facing outward in the central direction, and the other ring member connecting portion 63 is directed inward in the central direction. Thus, an adhesive layer having a release paper is formed. By peeling off the release paper of each ring member connecting portion 63, it is possible to make the ring member connecting portions 63 face each other and to be bonded, and the ring member 6b can be formed in an annular shape. Thus, the ring member connection portion 63 is provided on the ring member 6b, the end portions in the circumferential direction are connected to each other, and the ring member 6b slides and moves the large diameter portion 14 of the male fitting portion 4 At this time, the ring member 6 b can be slid while the large diameter portion 14 is stably gripped without the ring member 6 b being inclined with respect to the large diameter portion 14.

Further, a ring member 6c shown in FIG. 20 (a) may be used. In the ring member 6c, ring member connecting portions 63 are formed at the circumferential direction end portions 65 of the substantially C-shaped member, and the ring member connecting portions 63 connect the both end portions to each other. As shown in FIG. 20 (b), in the ring member connection portions 63 at both end portions in the circumferential direction, teeth are formed on the opposing surfaces of each other, and the teeth are engaged with each other to form the circumferential direction of the ring member 6c. The ends are connected.

At this time, the opening diameter of the reduced diameter portion of the ring member 6c is adjusted by adjusting the positions at which the teeth of the opposing surfaces of the ring member connection portion 63 mesh with each other, on the outer periphery of the ring member disposition portion 12 of the male fitting portion 4. It can be adjusted to fit the dimensions. Thus, by providing the slide guides 61 on the ring member 6c and connecting the end portions in the circumferential direction with the ring member connection portion 63, the ring member 6c slides the ring member disposition portion 12 of the male fitting portion 4 At this time, the ring member 6c can be slid while the ring member placement portion 12 is stably gripped without the ring member 6c being inclined with respect to the ring member placement portion 12.

Next, the connection method of the male fitting part 4 of the pipe fitting 1b and the female fitting part 43 is demonstrated. FIG. 21 is a view showing a state in which the male fitting portion 4 and the female fitting portion 43 are disposed to face each other, and the male fitting portion 4 is inserted into the female fitting portion 43. In the illustrated example, an example using the ring member 6 will be described. First, as shown in FIG. 21, the end of the male fitting portion 4 is inserted into the female fitting portion 43.

The female fitting portion 43 is formed on the inner circumferential portion of the tip (opening) of the tube 49. The female fitting portion 43 includes, in order from the tip end, the female side tubular portion 35, the female side slope portion 37 whose diameter is gradually reduced from the female side tubular portion 35, and the minimum inner diameter portion of the female side slope portion 37 And the ring fitting portion 39 expanded from the above.

As shown in FIG. 22A, when the male fitting portion 4 is pushed into the female fitting portion 43 from this state (arrow F in the figure), the female slope portion 37 of the female fitting portion 43 The tapered portion of the outer periphery of the ring member 6 disposed in the ring member placement portion 12 contacts. Further, when the male fitting portion 4 is pushed into the female fitting portion 43, as shown in FIG. 22 (b), the vicinity of the reduced diameter portion 22 of the ring member 6 is replaced by the large diameter portion 14 of the male fitting portion 4. It can slide to the slope part 16 vicinity (arrow G in a figure).

Here, the ring member 6 can slide in the ring member arrangement portion 12 until the tip end of the claw portion 24 contacts the locking wall 8. At this time, since the length of the ring member 6 is longer than the length of the small diameter portion 18, the reduced diameter portion 22 side end of the ring member 6 is located on the large diameter portion 14.

When the male fitting portion 4 is pushed into the female fitting portion 43 from this state, the contact portion of the slope portion 16 of the male fitting portion 4 and the large diameter portion 14 of the ring member 6 is used as a fulcrum. The claws 24 rotate so as to fall down in the tube axis direction, and the ring member 6 can be elastically deformed to be reduced in diameter. That is, the claw portion 24 of the ring member 6 is inclined in the direction of the tube axis with the contact portion between the inner peripheral side of the reduced diameter portion 22 of the ring member 6 and the large diameter portion 14 of the male fitting portion 4 as a fulcrum. It can be rotated. Therefore, a part in the vicinity of the tip end of the claw portion 24 can be accommodated in the small diameter portion 18 of the male fitting portion 4.

As shown in FIG. 23 (a), when the male fitting portion 4 is further pushed into the female fitting portion 43 from this state (arrow F in the figure), the end of the claw portion 24 is the female fitting portion 43. Go through the female slope 37 of the At this time, the resilient deformation of the claw portion 24 is released from the pressure from the female side slope portion 37, and is restored to the original diameter to be expanded (arrow J in the drawing). As a result, the claws 24 are accommodated in the ring fitting portion 39 formed on the base side of the female inclined surface 37 of the female fitting portion 43.

FIG. 23 (b) is a view showing the connection structure 10 in which the male fitting portion 4 and the female fitting portion 43 are connected, obtained in this manner. In this state, the tip end of the claw portion 24 engages with the ring fitting portion 39 of the female fitting portion 43. For this reason, even when trying to pull out the female fitting portion 43 (arrow K in the figure), the movement of the ring member 6 is restricted by the locking wall 8, and the male fitting portion 4 from the female fitting portion 43 It will not be pulled out.

In FIG. 23, the water blocking member 32 is disposed in the water blocking member storage portion between the locking walls 8. In this state, the outer peripheral surface of the water blocking member 32 is in close contact with the inner surface of the female tubular portion 35 of the female fitting portion 43. That is, the water blocking member 32 can fill the gap between the male fitting portion 4 and the female fitting portion 43. For this reason, it is possible to prevent moisture from entering the connection structure 10 from the outside.

Further, since the water blocking member 32 is disposed closer to the base than the ring member 6, when the male fitting portion 4 is pushed into the female fitting portion 43, the female fitting portion 43 is the water blocking member 32. It does not receive resistance from the water blocking member 32 until it comes into contact with it. For this reason, the pushing resistance to the female fitting part 43 of the male fitting part 4 can be made small.

FIG. 24 is a view showing another connection structure 10, which is a connection structure of the male fitting portion 4 and the female fitting portion 43 using the ring member 6a (see FIG. 18). As described above, the ring member 6 a has the claw portion 24 and the slide guide 61. Even in this case, when the male fitting portion 4 is pushed into the female fitting portion 43, the claw portion 24 contacts the female slope portion 37 of the female fitting portion 43. Further, by pushing the male fitting portion 4 into the female fitting portion 43, the tip of the slide guide 61 of the ring member 6a is slid until it abuts on the locking wall 8 on the base side of the male fitting portion 4. It can be moved.

When the male fitting portion 4 is further pushed into the female fitting portion 43 from this state, the claw portion 24 is deformed to pass through the female slope portion 37 of the female fitting portion 43 and to be elastically deformed. The pressure from the female side slope portion 37 is released, and the diameter 24 is restored to the original diameter and expanded. Thereby, the tip end of the claw portion 24 is fitted with the ring fitting portion 39 of the female fitting portion 43. For this reason, even when trying to pull out the female fitting portion 43 (arrow M in the figure), the movement of the ring member 6a is restricted by the locking wall 8, and the male fitting portion 4 is released from the female fitting portion 43. It will not be pulled out.

FIG. 25 is a view showing still another connection structure 10, which is a connection structure of the male fitting portion 4 and the female fitting portion 43 using the ring member 6c (see FIG. 20). As described above, the ring member 6c has the claw portion 24 and the slide guide 61, and the ring member connection portion 63 is formed at the circumferential end. In this case, after arranging the ring member 6c in the ring member arranging portion 12 of the male fitting portion 4, the ring member connecting portions 63 are connected to each other to make the ring member 6c annular.

Also in this case, the slide guide 61 restricts the slide of the ring member 6c and the ring member 6c has an annular shape, so that the ring member placement portion 12 is not inclined and is removed as in the case shown in FIG. Nor. Even in this case, even when trying to pull out the female fitting portion 43 (arrow M in the figure), the movement of the ring member 6c is restricted by the locking wall 8, and from the female fitting portion 43 to the male fitting portion 4 Will not be pulled out. In FIGS. 24 and 25, the water blocking member 32 is disposed in the same manner as in FIG.

According to the third embodiment, the same effect as that of the first embodiment can be obtained. That is, a rectangular electric wire tube in which a tube body large diameter portion 44 as a substantially rectangular peak portion and a tube body small diameter portion 45 as a circular valley portion are alternately formed at one end of the pipe joint 1b. The rectangular conduits 40 cut at the tube small diameter portion 45 can be connected. In addition, the male fitting portion 4 at the other end of the pipe fitting 1b is formed on the inner peripheral portion of the pipe 49, and from the tip end, the female cylindrical portion 35 and the female cylindrical portion 35 are gradually A female fitting portion 43 can be connected which includes a female side slope portion 37 which is reduced in diameter and a ring fitting portion 39 which is expanded in diameter from the minimum inner diameter portion of the female side slope portion 37.

In addition, since the ring member 6 and the like are disposed on the outer surface of the male fitting portion 4 at the connection portion of the rectangular electric conduit 40 with the female fitting portion 43, the ring member 6 and the like can be easily visually recognized. it can.

Further, when inserting the male fitting portion 4 into the female fitting portion 43, the diameter expansion by the expansion of the circumferential length of the ring member due to the elastic repulsive force of the ring member 6 etc. The ring member 6 etc. can be efficiently deformed by the effect of both of the diameter expansion by the recovery of the bending deformation inside. Therefore, even if the thickness of the claw portion 24 of the ring member 6 or the like to which the drawing force is applied is increased, the diameter of the ring member 6 can be easily reduced. As a result, the male fitting portion 4 and the female fitting portion 43 can be easily connected, and the male fitting portion 4 can be reliably prevented from coming off from the connected state.

In addition, the ring member 6 and the like can slide in the ring member arrangement portion 12. Therefore, for example, in the case of using the ring members 6 and 6b, when pushing the male fitting portion 4 into the female fitting portion 43, the large diameter portion 14 and the sloped portion near the end portions of the ring members 6 and 6b are sloped. It can be located near the boundary with the part 16. Therefore, at the time of connection, the ring members 6 and 6b can be easily deformed with the vicinity of the boundary between the large diameter portion 14 and the sloped portion 16 and the vicinity of the contact portion between the ring members 6 and 6b as a fulcrum. Further, when a force is applied in a direction in which the male fitting portion 4 is pulled out, the ring members 6 and 6b move and are positioned on the outer peripheral portion of the large diameter portion 14 of the ring member 6. Therefore, the diameter reduction of the ring members 6 and 6b can be suppressed.

In particular, since the ring member 6 and the like have an acute-angled wedge shape whose thickness decreases from the tip of the claw portion 24 toward the reduced diameter portion 22, when reducing the diameter of the ring member 6 and the like, The ring member 6 or the like can be easily deformed with the contact portion with the slope portion 16 in the above as a fulcrum.

Further, if the ring members 6a and 6c are used, the slide guides 61 are formed on the ring members 6a and 6c, so the ring members 6a and 6c can be stabilized without the ring members 6a and 6c being inclined. It can slide and move.

In particular, when the ring member 6c is used, the ring member connection portion 63 is formed. For example, the ring member is adjusted by adjusting the fitting position of the teeth formed on the opposing surface of each ring member connection portion 63. The diameter of the opening of the reduced diameter portion can be adjusted. Therefore, even in the case of connecting the large diameter rectangular electric conduit 40 having a large dimensional variation at the time of molding to the pipe joint 1, it is possible to stably slide the ring member 6 c.

Although the embodiments of the present invention have been described above with reference to the attached drawings, the technical scope of the present invention is not influenced by the above-described embodiments. It is apparent that those skilled in the art can conceive of various changes or modifications within the scope of the technical idea described in the claims, and they are naturally also within the technical scope of the present invention. It is understood that it belongs. Further, combinations of the embodiments disclosed in the embodiments of the present invention are also included in the present invention.

1, 1a, 1b ...... Pipe fitting 2 ...... Small-diameter portion fixing portion 3, 3a, 3b ............ Main body 4 ............ Male fitting portion 5 ...... Π-shaped fixing member 6, 6a, 6b 6c: Ring member 7: Top surface 8: Locking wall 9: Both feet 10, 10a, 60: Connection structure 11: Step 12: Ring member disposition 13 ...... Cylindrical portion 14 ...... Large diameter portion 15 ...... Cylindrical portion 16 ...... Slope portion 17 ...... Notch portion 18 ...... Small diameter portion 19 ...... Side surface 21 ...... Top surface 22 ......... Diameter reducing portion 23 ... ... Opening 24 ... ... Claws 25 ... ... Engaging step 26 ... ... Water sealing member accommodating portion 27 ... ... Engaging portion 28 ......... Clearance 29 ... ......

Bottom

31, 32 ...... Water blocking member 33 ...... Taper 34 ...... Connection wall 35 ...... Female tubular part 37 ...... Female slope 38 ...... Slit 39 ...... Ring fitting part 0 ......... Square electric conduit 43 ... ... Female fitting part 44 ... ... Tube body large diameter part 45 ... ... Tube body small diameter part 49 ... ... Tube body 61 ... ... Slide guide 63 ......... Ring member connecting portion 65 ... ... circumferential end

Claims

Between a male fitting portion and a female fitting portion formed at the end of the tube, a plurality of substantially rectangular shaped tube large diameter portions as circular portions on the outer peripheral surface of the tube, and a circular shape A tubular joint in which at least one side of a rectangular electric wire tube in which small diameter portions of the tube body as the valley portion are alternately formed is cut by the small diameter portion of the pipe body and connected to the small diameter portion of the rectangular electric wire tube ,
The pipe joint comprises a joint body and a hook-shaped fixing member,
The wedge-shaped fixing member has a top surface portion and both foot portions projecting downward which are connected substantially orthogonal to the top surface portion, and below the top surface portion, the two foot portions and the top surface portion Step portions are formed to project outward from the connecting portion, respectively
A small diameter portion fixing portion for fixing the small diameter portion of the pipe is formed on at least one side of the joint body,
The small diameter portion fixing portion includes a cylindrical portion into which the large diameter portion of the tubular body disposed on both sides of the small diameter portion of the tubular body is interposed with the small diameter portion of the tubular body interposed therebetween, and the back side of the cylindrical portion. And a cylindrical portion disposed in the
In a part of the cylindrical portion, a notch is formed in which the upper side of the side surface of the substantially rectangular portion and the top surface are opened,
When the wedge-shaped fixing member is inserted into the notch from above, the stepped portion of the wedge-shaped fixing member is placed on the cut-out side surface of the cylindrical portion, and the wedge-shaped fixing member The pipe joint characterized in that the wedge-shaped fixing member is fixed to the joint main body by inserting the two legs into the openings provided on both sides of the bottom of the cylindrical portion of the joint main body.
The pipe joint according to claim 1, wherein an engagement step portion is formed inside the side surface of the cylindrical portion at a position corresponding to the notch portion of the joint body.
An engagement portion is formed at a predetermined position below the step portion of the wedge-shaped fixing member toward the outside of the two foot portions, and the engagement step portion and the engagement portion are engaged with each other in the vertical direction. The pipe joint according to claim 2, characterized in that:
The pipe joint according to claim 1, wherein an inner peripheral surface of the top surface portion of the wedge-shaped fixing member has a substantially arc shape or an arch shape.
2. The pipe joint according to claim 1, wherein the legs do not project from the outer surface of the bottom when the legs of the hook-shaped fixing member are inserted into the opening of the joint body.
The water blocking member is disposed on the cylindrical portion of the joint body on the back side of the notch portion so as to surround the entire inner peripheral surface of the cylindrical portion. Pipe fitting.
The small diameter portion fixing portion and the cylindrical portion for fixing the small diameter portion of the pipe are formed symmetrically on both sides of the joint body, facing each other,
The pipe joint according to claim 1, wherein the wedge-shaped fixing member is respectively inserted into the notch portion of each of the cylindrical portions, and the wedge-shaped fixing member is fixed to the joint main body.
A male mold which has the small diameter portion fixing portion for fixing the small diameter portion of the pipe and the cylindrical portion on one side of the joint body, and is fixed to a female fitting portion on the other side of the joint body The pipe joint according to claim 1, wherein a fitting portion is formed.
The male fitting portion is a pair of locking walls disposed apart in the tube axis direction;
And a ring member disposed in an area sandwiched by the locking walls,
The ring member has a substantially C shape in which a part in the circumferential direction is cut,
The ring member includes a reduced diameter portion on one end side of the ring member, and a plurality of claws provided separately from each other with slits in the circumferential direction with respect to the reduced diameter portion. The diameter of the claws is gradually increased so that the outer diameter gradually increases from the reduced diameter portion toward the tip;
The ring member is disposed such that the tip end of the claw portion is located on the back side of the tube, and the reduced diameter portion is located on the tip side of the tube.
A large diameter portion is formed on the tip end side of the tube in the region sandwiched by the locking wall, and a small diameter portion is formed on the base side of the tube in the region sandwiched by the locking wall, A sloped portion is formed between the large diameter portion and the small diameter portion,
The ring member has a clearance between the ring member and at least one of the locking walls, and the ring member is slidable in the axial direction of the pipe in a region sandwiched by the locking walls. The pipe joint according to Item 8.
The male fitting portion is a pair of locking walls disposed apart in the tube axis direction;
And a ring member disposed in an area sandwiched by the locking walls,
The ring member has a substantially C shape in which a part in the circumferential direction is cut,
The ring member has a reduced diameter portion on one end side of the ring member, and a plurality of claw portions provided separately from each other with slits in the circumferential direction with respect to the reduced diameter portion, and A portion on the circumference of the reduced diameter portion not provided with the claw portion has a slide guide projecting parallel to the tube axis direction from the reduced diameter portion, and the claw portion extends from the reduced diameter portion to the tip The diameter is gradually increased so that the outer diameter gradually
The ring member is disposed such that the tip end of the claw portion is located on the back side of the tube, and the reduced diameter portion is located on the tip side of the tube.
The region sandwiched by the locking wall is formed in a straight tubular shape,
The ring member has a clearance between the ring member and at least one of the locking walls, and is slidable in a tube axial direction in a region where the ring member is sandwiched by the locking walls, and the movement of the ring member 9. The pipe joint according to claim 8, wherein the slide guide and the locking wall regulate the movement.
One end side connecting portion and the other end side connecting portion are formed at both end portions in the circumferential direction of the reduced diameter portion, the respective connecting portions are connected, and the ring member is formed in an annular shape. The pipe joint according to claim 9 or 10.
The pipe joint according to claim 6, wherein the water blocking member is a water-expandable non-woven fabric or rubber packing containing polyester fiber, sodium polyacrylate fiber and binder resin.
The pipe joint according to claim 1, wherein the joint body and the hook-shaped fixing member are respectively made of high density polyethylene, polypropylene, ABS resin, PC resin, ABS resin, or a polymer alloy of PC resin.
The both ends of the pipe joint according to claim 7, the tube large diameter portion as a plurality of substantially rectangular peak portions on the outer peripheral surface of the pipe body, and the tube small diameter portion as a circular valley portion A connection structure of a square electric conduit and a pipe joint characterized in that rectangular electric conduits cut at the small diameter portion of the tubular body are alternately connected.
10. The pipe joint according to claim 9, wherein at the outer peripheral surface of the pipe body, the pipe large diameter portion as a plurality of substantially rectangular peak portions and the pipe small diameter as a circular valley portion The rectangular electric conduits cut at the tube small-diameter portion of the rectangular electric conduits in which the portions are alternately formed are connected,
The male fitting portion at the other end of the pipe fitting is formed on the inner peripheral portion of the tubular body, and the diameter is gradually reduced from the female side tubular portion and the female side tubular portion from the tip end side And the female fitting portion including the female side slope portion and the ring fitting portion expanded from the minimum inner diameter portion of the female side slope portion are connected. Joint connection structure.
11. The tube joint according to claim 10, wherein the tube large diameter portion as a plurality of substantially rectangular peak portions and the tube small diameter as a circular valley portion are provided on the outer peripheral surface of the tube. The rectangular electric conduits cut at the tube small-diameter portion of the rectangular electric conduits in which the portions are alternately formed are connected,
The male fitting portion at the other end of the pipe fitting is formed on the inner peripheral portion of the tubular body, and the diameter is gradually reduced from the female side tubular portion and the female side tubular portion from the tip end side And the female fitting portion including the female side slope portion and the ring fitting portion expanded from the minimum inner diameter portion of the female side slope portion are connected. Joint connection structure.
12. The pipe joint according to claim 11, wherein at the outer peripheral surface of the pipe body, the pipe large diameter portion as a plurality of substantially rectangular peak portions and the pipe small diameter as a circular valley portion The rectangular electric conduits cut at the tube small-diameter portion of the rectangular electric conduits in which the portions are alternately formed are connected,
The male fitting portion at the other end of the pipe fitting is formed on the inner peripheral portion of the tubular body, and the diameter is gradually reduced from the female side tubular portion and the female side tubular portion from the tip end side And the female fitting portion including the female side slope portion and the ring fitting portion expanded from the minimum inner diameter portion of the female side slope portion are connected. Joint connection structure.