JP2011247415A - Joining structure of sleeve and joint article used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure of a sleeve which can achieve joining strength stably while keeping good joining condition between a socket member and spigot member, and shorten time required for construction working remarkably by making adhesion between the socket member and spigot member unnecessary and eliminate influence on environment during construction.SOLUTION: A first engaging piece 214 radially projected outward is arranged in an outer peripheral surface of tip side part 212 of spigot member 21 arranged in one side end of a first small diameter sleeve 111, and second engaging pieces 224 radially projected inward from its circumferential 4 locations are arranged in an inner circumferential surface of tip side part 222 of socket member 22. Furthermore, a notch part 23 making each second engaging piece 224 permit elastically deforming toward a radial outside of it is arranged on the socket member 22, and a first vertical surface 215 of the first engaging piece 214 is made to be engaged with a vertical surface 220 of each second engaging piece 224 naturally and smoothly by getting over each second engaging piece 224 when the spigot member 21 is inserted into the socket member 22.

Description

  The present invention relates to a joining structure that joins ends of sheath pipes on the same axis line laid in a buried pipe buried in the ground, and a joined part used for the joining structure.

  2. Description of the Related Art Recently, a plurality of sheath pipes made of synthetic resin are laid in buried pipes buried in the ground, and a communication cable or the like is inserted into each sheath pipe. In this case, each sheath tube is extended by joining ends of a plurality of sheath tubes on the same axis to guide a communication cable or the like to a required place.

  And joining by the well-known what is called TS joining method was performed in order to join the edge parts of two sheath tubes on the same axis. That is, a surface layer of a predetermined length is peeled off from the tube end of one sheath tube, and the surface is tapered to form a tube insertion port, and an adhesive is applied to this and inserted into the tube receiving port of the other sheath tube. And bonded by bonding. At this time, it is necessary for an operator to hold the ends of the sheath tube by hand until the adhesive is solidified and an adhesive effect is obtained.

  Therefore, as a conventional sheath-tube joining structure, a difference port portion having a first engagement piece projecting radially outward on the outer peripheral surface of the tube end portion of one sheath tube is used as the inner periphery of the other tube end portion. A receiving portion having a second engaging piece projecting radially inward on the surface is inserted, and the outer peripheral surface of the outlet portion of one sheath tube is inserted into the inner peripheral surface of the receiving portion of the other sheath tube In this case, the end portions of both sheath tubes are engaged with each other (see, for example, Patent Document 1). And in the state which apply | coated the adhesive agent to the outer peripheral surface of the opening part of said one sheath tube, and the inner peripheral surface of the receiving part of said other sheath tube, the opening part of one sheath tube is made into the other sheath. Until the adhesive is solidified and an adhesive effect is obtained by inserting the tube through the receiving portion of the tube, overcoming the second engagement piece, and engaging the first engagement piece with the second engagement piece I keep trying to hold it temporarily.

Japanese Patent No. 3360086

However, in the above-mentioned conventional one, the first engagement piece is engaged with the second engagement piece of the receiving portion when the sheath pipes are joined to each other. And the second engaging piece are engaged with each other by coagulating the adhesive applied to the outer peripheral surface of the outlet portion of one sheath tube and the inner peripheral surface of the receiving portion of the other sheath tube to obtain an adhesive effect. It's just something that is temporarily held down until it is made. For this reason, simply engaging the first engagement piece and the second engagement piece does not mean that the joint between the receiving portion and the differential portion is necessary and sufficient, and the temperature of 30 ° C. that occurs in the buried pipe. It cannot be said that it can withstand the load (thermal expansion and contraction stress) acting by the thermal expansion and contraction of each sheath tube caused by the temperature change.
In that case, in order that the engagement between the first engagement piece and the second engagement piece can withstand the load caused by the thermal expansion and contraction of each sheath tube, the engagement pieces of the receiving portion and the differential portion are engaged with each other. The joint height (the overlapping margin in the radial direction) is required to some extent. Specifically, when joining the sheath tubes having an inner diameter of 30 mm, the engagement height between the engagement pieces is 1 mm or more. Necessary. For this reason, when the first engagement piece of the opening portion gets over the second engagement piece of the receiving portion, a large deformation of the first and second engaging pieces, that is, the second engaging piece of the receiving portion becomes larger. A deformation for expanding the diameter and a deformation for reducing the diameter of the first engagement piece at the opening are required. In this case, it is impossible for the first engagement piece of the opening portion to get over the second engagement piece of the receiving portion and engage with the second engagement piece. Even if the two engaging pieces can be engaged with each other, the first engaging piece at the opening portion and the second engaging piece at the receiving portion may be deformed, and the receiving portion and the connecting portion. The joint strength cannot be obtained stably.

Further, in the above-mentioned conventional one, since the receiving part and the connecting part are joined by the adhesive effect due to the solidification of the adhesive, when a large number of sheath pipes are laid in the buried pipe, In this case, it takes a long time for the adhesive of each sheath tube to solidify, and the adhesive may leak into and out of the buried tube, which may cause an adverse environmental impact during construction work.
Moreover, if an adhesive is used for the joining structure of the sheath tube, the receiving part and the connecting part may differ depending on the weather during construction, the method of individual application of the worker, and insufficient insertion of the connecting part into the receiving part. The quality of the joining state with the part is greatly influenced. For this reason, there is a possibility that the opening part may come off from the receiving part due to these factors, and there is a variation in the joining state between the receiving part and the joining part, and it is meticulous to keep the joining state of both parts good. Caution must be taken.

  The present invention has been made in view of such points, and the object of the present invention is to stably obtain the bonding strength while maintaining a good bonding state between the receiving portion and the opening portion, Providing a joint structure for a sheath tube that eliminates the adverse effects on the environment during construction work by significantly reducing the time required for construction work by eliminating the need to bond the receiving part and the differential part with an adhesive. There is.

In order to achieve the above-mentioned object, the solution provided by the present invention is made of a synthetic resin, made of a synthetic resin, an opening portion provided at an end portion on the one axial side of the first sheath tube, and a second sheath. A sheath tube provided at an end portion on the other side in the axial direction of the tube, wherein the gap portion is inserted into the mouth portion and the gap portion and the mouth portion are joined to each other Assuming a joint structure of Furthermore, a first engagement piece that protrudes radially outward is provided on the outer peripheral surface of the opening portion, while a first protrusion that protrudes radially inward is provided on the inner peripheral surface of the receiving portion. Two engaging pieces are provided so that the first engaging piece gets over the second engaging piece and engages with the second engaging piece when the insertion part is inserted into the receiving part. It has become. And either one of the said opening part and the said receiving part is provided with the notch part which accepts the elastic deformation to the inner-outer-diameter direction of the 1st or 2nd engagement piece provided in the one.
Due to this specific matter, when joining the sheath tubes, it is provided at the end portion on the one axial direction side of the first sheath tube with respect to the receiving portion provided at the end portion on the other axial direction side of the second sheath tube. When the insertion port portion is inserted, the notch portion provided in either the insertion port portion or the receiving port portion causes the first or second engagement piece provided in one of the inner and outer diameter directions, that is, radially inward and outward. Therefore, the first and second engagements of the first engagement piece of the opening portion and the second engagement piece of the reception portion can withstand the load caused by thermal expansion and contraction of the sheath tube. Even if the engagement height (overlap margin in the radial direction) between the two engagement pieces is ensured to some extent, the inside or outside of the first or second engagement piece when the insertion portion is inserted into the receiving portion. Due to the elastic deformation in the radial direction, the first engagement piece gets over the second engagement piece and smoothly and smoothly engages with the second engagement piece. .
As a result, when the first engaging piece gets over the second engaging piece, a deformation that greatly increases the diameter of the second engaging piece in the receiving portion and a deformation that reduces the diameter of the first engaging piece in the differential portion. No major deformation of the first and second engaging pieces is required, and no deformation due to laceration of the first engaging piece of the opening portion and the second engaging piece of the receiving portion is eliminated. It is possible to stably obtain the bonding strength between the gap portion and the gap portion.
Moreover, it is not necessary to join the receiving portion and the opening portion due to the adhesive effect of the adhesive, and the application time and the solidification time of the adhesive in a large number of sheath pipes laid in the buried pipe at the time of construction work become unnecessary. Thus, the construction work time can be greatly shortened, and the adverse effect on the environment during construction work due to leakage of the adhesive into and out of the buried pipe can be eliminated.
Furthermore, since no adhesive is required, the condition of the connection between the receiving part and the connecting part due to the weather during construction, the method of individual application of the worker, and insufficient insertion of the connecting part to the receiving part. There is no variation in quality, and it is possible to prevent the gap portion from coming off from the receptacle portion due to these factors, and it is possible to maintain a good joined state between the receptacle portion and the receptacle portion.

Moreover, it is preferable that the outer peripheral surface of the said 1st engagement piece is formed in the taper shape which becomes a small diameter to the axial direction one side of the said opening part.
In this case, the tapered outer peripheral surface of the first engagement piece smoothly passes over the inner peripheral surface of the second engagement piece when the insertion portion is inserted into the receiving portion, and the first engagement piece is moved to the second engagement portion. The mating piece can be engaged smoothly without difficulty.

Moreover, it is preferable that the inner peripheral surface of the second engaging piece is formed in a tapered shape having a small diameter toward one side in the axial direction of the receiving portion.
In this case, the outer peripheral surface of the first engagement piece smoothly passes over the second engagement piece along the tapered inner peripheral surface of the second engagement piece when the insertion portion is inserted into the receiving port portion. The first engagement piece can be more smoothly and smoothly engaged with the second engagement piece.

Moreover, it is preferable that the said 1st engagement piece is provided in the edge part of the axial direction one side of the said opening part.
In this case, the length of the first engagement piece in the axial direction is shortened, and the length of the second engagement piece in the axial direction is also shortened. For this reason, when the insertion port portion is inserted into the receiving port portion, the elastic force due to the elastic deformation of the first or second engagement piece in the inner and outer diameter direction acts greatly, and the first engagement piece and the second engagement piece The engagement state with the piece can be made strong.

The opening portion is joined to the end portion on the one axial direction side of the first sheath tube, and the receiving portion is joined to the end portion on the other axial direction side of the second sheath tube by spin welds. It is preferable.
In this case, the opening portion is integrated with the end portion on one axial direction of the first sheath tube, and the receiving portion is integrated with the end portion on the other axial direction side of the second sheath tube without using an adhesive. It is possible to reliably eliminate the influence on the environment during construction work due to the leakage of the adhesive into and out of the buried pipe. In addition, since the adhesive is not required, the quality of the joint state between the outlet and the receiving portion and each sheath tube due to the weather at the time of construction, how to apply the adhesive of each worker, etc. may occur. It is lost, and the joining state of the differential part and the receiving part due to these factors and each sheath tube can be kept good.

The receptacle portion is provided with a stopper for restricting further insertion of the opening portion with respect to the receptacle portion when the first engagement piece is engaged with the second engagement piece. May be.
In this case, since the further insertion of the gap portion is restricted by the stopper, the first engagement piece is held in a state of being engaged with the second engagement piece, and the first engagement piece and the second engagement piece are held. The engaged state with the piece can be kept smooth.

In addition, it is preferable that a rib extending in the axial direction of the receiving portion is provided on the outer peripheral surface of the second engagement piece.
In this case, the rigidity of the second engagement piece is improved by the rib, and the strength against buckling of the receiving portion can be increased. In addition, when the receiving part is joined to the other axial end of the second sheath tube by spin weld, the receiving part can be smoothly fixed to the rotating device by using the rib, and the receiving part by the rotating device. Can be easily fixed.

In addition, when the insertion portion is inserted into the receiving portion and joined to the end portion on the other axial side of the outer peripheral surface of the inserting portion that is inserted into the inner peripheral surface of the receiving portion, the receiving portion is received. It is preferable to provide an enlarged-diameter portion that fits the inner peripheral surface of the mouth portion into the outer peripheral surface of the opening portion in the radial direction without gaps.
In this case, the inner peripheral surface of the receiving portion is inserted into the enlarged diameter portion of the outer peripheral surface of the first engagement piece without any gap in the radial direction when the gap portion is inserted and joined to the receiving portion. . For this reason, rattling does not occur between the end on the other side in the axial direction of the outer peripheral surface of the first engagement piece and the enlarged diameter portion of the inner peripheral surface of the receiving portion. Thereby, even if it uses in the corner part with a curve, a level | step difference does not arise between an opening part and a receptacle part, and the damage by the level | step difference to the cables accommodated inside can be prevented.

In addition, it is preferable to provide a tapered surface on one side in the axial direction of the enlarged diameter portion so that the diameter of the enlarged diameter portion increases toward the other side in the axial direction on the outer peripheral surface of the opening portion.
In this case, when the gap portion is inserted and joined to the receiving portion, the end on the other side in the axial direction of the outer peripheral surface of the first engagement piece is tapered to the enlarged diameter portion of the inner peripheral surface of the receiving portion. Smooth guidance along the surface. Thereby, the operation | work at the time of inserting and inserting a gap part to a receiving part can be performed smoothly.

And a second sheath tube corresponding to the first sheath tube and the receiving portion corresponding to the difference portion, and a second sheath tube corresponding to the difference portion. It is preferable to mold at least one of the transparent synthetic resin through which the inside can be seen through.
In this case, the inside can be seen through and the type of cable can be easily confirmed, and the erroneous connection between the outlet portion of the first sheath tube and the receiving portion of the second sheath tube can be reliably prevented.

Further, the receiving port portion is formed by injection molding, and a through hole is formed in the end portion on the one axial direction side of the second engagement piece so as to penetrate the receiving port portion radially outward along the end surface. It is preferable.
In this case, the second engagement piece is provided with a through-hole penetrating radially outward of the receiving portion along the end surface at the end portion on the one axial direction side of the second engagement piece. In order to form, the slide core of the mold may be slid radially outward through the through hole. Thereby, the structure of the mold | die which shape | molds the inner peripheral surface of a receptacle part can be made very simple.

In order to achieve the above-mentioned object, the other means taken by the present invention are a differential member made of a synthetic resin that can be joined to an end portion on one axial direction of the first sheath tube, and the first sheath tube. And a receiving member made of a synthetic resin that can be joined to the other end in the axial direction of the second sheath tube on the same axis, and inserting the opening member into the receiving member, Assume a joining component that joins the receiving member. Furthermore, a first engagement piece that protrudes radially outward is provided on the outer peripheral surface of the opening member, while a first protrusion that protrudes radially inward is provided on the inner peripheral surface of the receiving member. Two engaging pieces are provided, and the first engaging pieces get over the second engaging pieces and engage with the second engaging pieces when the insertion member is inserted into the receiving member. It has become. And either one of the said opening member and the said receiving member is provided with the notch part which accept | permits the elastic deformation to the inner-outer-diameter direction of the 1st or 2nd engagement piece provided in the one.
According to this specific matter, when the insertion member that can be joined to the end portion on the one axial direction side of the first sheath tube is inserted into the receiving member that can be joined to the end portion on the other axial direction side of the second sheath tube, Since the notch portion provided in one of the opening member and the receiving member allows the first or second engaging piece provided in one of them to be elastically deformed inward and outward in the radial direction. The engagement height between the first and second engagement pieces is set to some extent so that the engagement between the first engagement piece of the member and the second engagement piece of the receiving member can withstand the load due to thermal expansion and contraction of the sheath tube. Even if secured, the first engagement piece gets over the second engagement piece by elastic deformation of the first or second engagement piece in the inner / outer diameter direction when the insertion member is inserted into the receiving member. Thus, the second engagement piece is smoothly and smoothly engaged.
As a result, when the first engaging piece gets over the second engaging piece, a deformation that greatly increases the diameter of the second engaging piece of the receiving member and a deformation that reduces the diameter of the first engaging piece of the differential member. Such a large deformation of the first and second engaging pieces becomes unnecessary, and deformation due to laceration of the first engaging piece of the opening member and the second engaging piece of the receiving member does not occur. It is possible to stably obtain the bonding strength between the connector and the differential member.
Moreover, it is not necessary to join the receiving member and the outlet member due to the adhesive effect of the adhesive, and the application time and coagulation time of the adhesive in a large number of sheath pipes laid in the buried pipe at the time of construction work become unnecessary. Thus, the construction work time can be greatly shortened, and the adverse effect on the environment during construction work due to leakage of the adhesive into and out of the buried pipe can be eliminated.
Furthermore, since no adhesive is required, the condition of the connection between the receiving member and the connecting member due to the weather during construction, the method of individual application of the worker, the insufficient insertion of the connecting member into the receiving member, etc. There is no variation in quality, it is possible to prevent the outlet member from coming off from the outlet member due to these factors, and it is possible to maintain a good joined state between the outlet member and the outlet member.

  In summary, according to the invention described in claim 1 or claim 12, when joining the sheath tubes, the joint portion (receiving member) of the end portion on the other side in the axial direction of the second sheath tube is used. When the insertion part (substituting member) at the end on the one axial direction side of the first sheath tube is inserted, the first or second part is formed by the cutout part of either the insertion part or the reception part. By allowing the engagement pieces to be elastically deformed in the inner and outer diameter directions, the first engagement pieces are second even if the engagement height between the first engagement pieces and the second engagement pieces is sufficiently secured. Overcoming the engaging piece, it smoothly and smoothly engages with the second engaging piece. Accordingly, when the first engagement piece gets over the second engagement piece, the first and second engagement pieces do not need to be greatly deformed, and the first engagement piece at the opening portion and the second engagement at the receiving portion are eliminated. It is possible to stably obtain the bonding strength between the receiving portion and the opening portion without causing deformation due to tearing of the piece. Moreover, it is no longer necessary to join the receiving part and the differential part due to the adhesive effect of the adhesive, so that the application time and solidification time of the adhesive during construction work are no longer necessary, and the construction work time can be greatly shortened. In addition, it is possible to eliminate adverse effects on the environment during construction work due to leakage of the adhesive into and out of the buried pipe. In addition, variations in the quality of the joint between the receiving part and the connecting part due to the weather during construction, the method of individual application of the worker, and insufficient insertion of the connecting part to the receiving part are corrected. It is possible to maintain a good bonding state between the portion and the gap portion.

It is a longitudinal section in the state where each sheath pipe using the junction structure concerning a 1st embodiment of the present invention was laid in a buried pipe. It is a vertical side view in the state where the spout member and receptacle member concerning a 1st embodiment of the present invention were joined. It is a vertical side view of the opening member of FIG. It is the front view which looked at the opening member of FIG. 3 from the anti 1st small diameter sheath pipe side. It is the vertical side view which notched a part of receptacle member of FIG. It is the front view which looked at the receiving member of FIG. 5 from the 2nd small diameter sheath pipe side. It is a vertical side view in the state where the slot member and receptacle member concerning a 2nd embodiment of the present invention were joined. It is a vertical side view of the opening member of FIG. It is a vertical side view of the receiving member of FIG. It is a vertical side view in the state where the spout member and receiving member which concern on the 3rd Embodiment of this invention were joined. It is a vertical side view of the opening member of FIG. It is a vertical side view of the receiving member which notched a part of FIG. It is the front view which looked at the receiving member of FIG. 12 from the 2nd small diameter sheath pipe side. It is a vertical side view in the state where the spout member and receiving member which concern on the 4th Embodiment of this invention were joined. It is a vertical side view of the opening member of FIG. It is the front view which looked at the opening member of FIG. 15 from the anti 1st small diameter sheath pipe side. It is the vertical side view which notched a part of receptacle member of FIG. It is a vertical side view in the state where the spout member and receptacle member concerning a 5th embodiment of the present invention were joined. It is a vertical side view of the opening member of FIG. It is the front view which looked at the opening member of FIG. 19 from the anti 1st small diameter sheath pipe side. It is the vertical side view which notched a part of receptacle member of FIG. It is a vertical side view in the state where the spout member and receptacle member concerning a 6th embodiment of the present invention were joined. It is a vertical side view of the opening member of FIG. It is a vertical side view of the receiving member of FIG. It is sectional drawing in the AA of FIG. FIG. 25 is a longitudinal side view of the receiving member for explaining the movement of the slide core that moves outward in the radial direction via a through hole provided on one side in the axial direction of the second engaging piece of the receiving member of FIG. 24. FIG. 26 is a view corresponding to FIG. 25 according to a modification of the sixth embodiment. It is a vertical side view which notched a part of receptacle member which concerns on the 7th Embodiment of this invention. It is the rear view which looked at the receptacle member of FIG. 28 from the axial direction other side. It is a longitudinal section in the state where each sheath pipe concerning the 7th embodiment of the present invention was laid in a large buried pipe. It is a longitudinal cross-sectional view in the state which laid each sheath pipe of Drawing 30 in a small buried pipe. It is a side view of a sheath pipe before joining a spout member and a spout member concerning an 8th embodiment of the present invention. It is a side view of a sheath pipe before joining a mouthpiece member and a mouthpiece member concerning a modification of an 8th embodiment. It is a side view of a sheath pipe before joining a mouthpiece member and a mouthpiece member concerning other modifications of an 8th embodiment. It is a side view of a sheath pipe before joining a mouthpiece member and a mouthpiece member concerning other modifications of an 8th embodiment. It is a side view of a sheath pipe before joining a mouthpiece member and a mouthpiece member concerning other modifications of an 8th embodiment. It is a side view of a sheath pipe before joining a mouthpiece member and a mouthpiece member concerning other modifications of an 8th embodiment. It is a side view of the receiving member which shows the state which describes a line, rotating the receiving member of FIG. 37 with a rotating apparatus. FIG. 38 is a side view of the opening member showing a state where a line is marked on the opening member of FIG. 37 while being rotated by a rotating device. FIG. 3 is a diagram corresponding to FIG. 2 according to a modification of the first embodiment. FIG. 6 is a diagram corresponding to FIG. 5 according to a modification of the first embodiment. FIG. 9 is a diagram corresponding to FIG. 7 according to a modification of the second embodiment. FIG. 9 is a diagram corresponding to FIG. 8 according to a modification of the second embodiment. FIG. 10 is a diagram corresponding to FIG. 7 according to another modification of the second embodiment. FIG. 10 is a diagram corresponding to FIG. 9 according to another modification of the second embodiment.

  Embodiments of the present invention will be described below with reference to the accompanying drawings for understanding of the present invention. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

  In FIG. 1, reference numerals 11 and 12 denote sheath tubes connected on the same axis using the connection structure according to the first embodiment of the present invention, and these sheath tubes 11 and 12 are embedded in the buried tube 10. Is laid. Each of the sheath pipes 11 and 12 is provided for passing and protecting a communication cable such as an optical fiber cable (not shown). Of the sheath tubes 11 and 12, the small-diameter sheath tube 11 having a small diameter of 34 mm is made of hard vinyl chloride resin. On the other hand, the large-diameter sheath tube 12 having an outer diameter of 54 mm, which is a large diameter, is also made of a hard vinyl chloride resin. Five small-diameter sheath tubes 11 and five large-diameter sheath tubes 12 are laid in the buried tube 10 having a nominal diameter of 200. In this case, the inner diameter of each small diameter sheath tube 11 is set to 30 mm, and the inner diameter of each large diameter sheath tube 12 is set to 50 mm. Further, the buried pipe 10 has an outer diameter of 216 mm and an inner diameter of 194 mm. In this case, the small-diameter and large-diameter sheath tubes 11 and 12 (a first small-diameter sheath tube 111 and a second small-diameter sheath tube 112 described later) are formed by extrusion molding of a hard vinyl chloride resin, respectively.

As shown in FIG. 2, each small-diameter sheath tube 11 and each large-diameter sheath tube 12 in the embedded tube 10 are joined parts 2 (in FIG. 11 shows only a joining part for joining 11).
Here, since the joining component 2 used for the joining structure which joins the edge parts of each small diameter sheath pipe | tube 11 and the edge parts of each large diameter sheath pipe | tube 12 on the same axis line respectively becomes the same structure, each small diameter sheath What joins the edge parts of the pipe | tube 11 on the same axis line is demonstrated. Specifically, one side end portion (left side end portion in FIG. 2) of the first small-diameter sheath tube 111 as the first sheath tube and the other end portion of the second small-diameter sheath tube 112 as the second sheath tube (see FIG. 2, the right end portion) will be described on the same axis.

  The joining component 2 includes a port member 21 as a port portion attached to one side end portion of the first small-diameter sheath tube 111, and a receptacle attached to the other side end portion of the second small-diameter sheath tube 112. A receiving member 22 as a mouth portion is provided. Each of the opening member 21 and the receiving member 22 is formed by injection molding a hard vinyl chloride resin. Moreover, the said opening member 21 consists of the front end side site | part 212 which becomes the axial direction one side (left side in FIG. 2), and the base end side site | part 211 which becomes an axial direction other side (right side in FIG. 2). An insertion hole 213 through which the outer peripheral surface of one side end portion of the first small diameter sheath tube 111 is inserted is provided in the proximal end portion 211 of the differential port member 21. One side end portion of the first small-diameter sheath tube 111 inserted through the insertion hole 213 and the differential member 21 are fused and integrally joined by relative rotation around the axis by spin weld. Further, the other end in the axial direction of the outer peripheral surface of the proximal end portion 211 of the outlet member 21 is chamfered so as to be inclined by approximately 45 ° with respect to the axial line.

  On the other hand, the receiving member 22 includes a proximal end portion 221 that is one side in the axial direction (left side in FIG. 2) and a distal end portion 222 that is the other side in the axial direction (right side in FIG. 2). An insertion hole 223 through which the outer peripheral surface of the other end of the second small-diameter sheath tube 112 is inserted is provided in the proximal end portion 221 of the receiving member 22. The other end portion of the second small-diameter sheath tube 112 inserted through the insertion hole 223 and the receiving member 22 are fused and integrally joined by relative rotation around the axis by spin weld. Further, one end in the axial direction of the outer peripheral surface of the base end portion 221 of the receiving member 22 is chamfered so as to be inclined by approximately 45 ° with respect to the axis.

  Further, as shown in FIGS. 3 and 4, the outer peripheral surface of the distal end side portion 212 of the mouthpiece member 21 is radially outward with a predetermined length (for example, about 8 mm) in the axial direction from the distal end. A protruding first engagement piece 214 is provided. The first engagement piece 214 continuously protrudes over the entire circumferential direction of the outer peripheral surface of the opening member 21. And the outer peripheral surface of the said 1st engagement piece 214 is formed in the taper shape used as a small diameter to the axial direction one side (FIG. 2 left side) of the said opening member 21. As shown in FIG. Further, the outer peripheral surface of the distal end side portion 212 excluding the first engagement piece 214 of the opening member 21 is formed to have a smaller diameter than the outer peripheral surface of the proximal end side portion 211, and the axial direction of the opening opening member 21 is the same in the axial direction. It is formed in a tapered shape with a small diameter toward the side. The outer peripheral surface of the first engaging piece 214 and the outer peripheral surface of the distal end side portion 212 excluding the first engaging piece 214 are formed in a step shape, and the other side in the axial direction of the first engaging piece 214 It is connected by a first vertical surface 215 at the end (right end in FIG. 2). Further, the outer peripheral surface of the proximal end side portion 211 and the outer peripheral surface of the distal end side portion 212 are formed in a step shape and are connected by a second vertical surface 216 at one end in the axial direction of the proximal end portion 211. ing.

  On the other hand, as shown in FIGS. 5 and 6, the inner peripheral surface of the distal end portion 222 of the receiving member 22 has a depth of a predetermined length (for example, about 15 mm) in the axial direction in the vicinity of the central portion thereof in the radial direction. A second engagement piece 224 protruding inward is provided. The second engagement pieces 224 protrude with a predetermined length (for example, about 8 mm to 10 mm) in the circumferential direction at four locations on the inner circumferential surface of the receiving member 22 at predetermined intervals in the circumferential direction. The second engagement piece 224 is formed in a taper shape having an inner peripheral surface with a small diameter toward one side in the axial direction of the receiving member 22 (left side in FIG. 5), and one end in the axial direction (see FIG. The left end in FIG. 5 projects most radially inward.

よって、熱伸縮応力σが６．１７ＭＰａ作用しているため、表１から、内径が３０ｍｍの小径鞘管１１では、１２４１Ｎ（１２６ｋｇｆ）以上の接合強度が必要であり、内径が５０ｍｍの大径鞘管１２では、２０１７Ｎ（２０６ｋｇｆ）以上の接合強度が必要であることが判る。 Here, the thermal expansion-contraction force which acts on each sheath tube 11 and 12 is demonstrated.
The Young's modulus E of each hard tube 11 and 12 made of hard vinyl chloride resin is 2940 MPa, and the linear expansion coefficient α of the hard vinyl chloride resin is 7.0E-5. Assuming that ΔT is 30 ° C., the thermal expansion and contraction stress σ (MPa) acting on each of the sheath tubes 11 and 12 is obtained by the following equation.
σ = E ・ α ・ ΔT
Based on this result, the load applied to each of the sheath tubes 11 and 12 is shown in Table 1.

Therefore, since the thermal expansion and contraction stress σ acts at 6.17 MPa, from Table 1, the small-diameter sheath tube 11 having an inner diameter of 30 mm requires a bonding strength of 1241N (126 kgf) or more, and the large-diameter sheath having an inner diameter of 50 mm. It can be seen that the tube 12 requires a bonding strength of 2017N (206 kgf) or more.

よって表２から、差口部材２１の第１係合片２１４の軸線方向他側端の第１縦面２１５と各第２係合片２２４の軸線方向一側端の縦面２２０との係合高さが０．７ｍｍの場合には、第１係合片２１４と第２係合片２２４とは、両者間に作用する引抜き力が１１００Ｎで抜けてしまうことが判る。これに対し、第１係合片２１４の第１縦面２１５と第２係合片２２４の縦面２２０との係合高さが１．２ｍｍの場合には、第１係合片２１４と第２係合片２２４との間に作用する引抜き力によって、第１係合片２１４に割れなどの裂傷による変形が生じてしまうまで耐え、そのときの引抜き力が３３００Ｎであることから、十分な接合力であることが判る。
そこで、第１係合片２１４と各第２係合片２２４との係合を各小径鞘管１１（第１及び第２小径鞘管１１１，１１２）の熱伸縮による荷重に耐え得るようにする上で、差口部材２１の第１係合片２１４の軸線方向他側端の第１縦面２１５と各第２係合片２２４の軸線方向一側端の縦面２２０との係合高さ（半径方向での互いの重なり代）を１．２ｍｍに設定している。 In that case, it is the first vertical surface 215 at the other end in the axial direction of the first engagement piece 214 of the outlet member 21 and each second engagement that influences the joining force between the ends of the sheath tubes 11 and 12. This is the height of engagement of the piece 224 with the vertical surface 220 at one end in the axial direction (the overlapping margin in the radial direction).
From this point, Table 2 shows the results of experiments conducted on the joining force between the first small-diameter sheath tube 111 and the second small-diameter sheath tube 112.

Therefore, from Table 2, the engagement between the first vertical surface 215 at the other end in the axial direction of the first engagement piece 214 and the vertical surface 220 at one end in the axial direction of each second engagement piece 224 is shown. When the height is 0.7 mm, it can be seen that the first engaging piece 214 and the second engaging piece 224 come out when the pulling force acting between them is 1100 N. On the other hand, when the engagement height between the first vertical surface 215 of the first engagement piece 214 and the vertical surface 220 of the second engagement piece 224 is 1.2 mm, the first engagement piece 214 and the first engagement piece 214 The pulling force acting between the two engaging pieces 224 can withstand until the first engaging piece 214 is deformed by a tear such as a crack, and the pulling force at that time is 3300 N. It turns out that it is power.
Therefore, the engagement between the first engagement piece 214 and each second engagement piece 224 can withstand the load caused by thermal expansion and contraction of each small-diameter sheath tube 11 (first and second small-diameter sheath tubes 111 and 112). Above, the engagement height between the first vertical surface 215 at the other end in the axial direction of the first engagement piece 214 and the vertical surface 220 at one end in the axial direction of each second engagement piece 224. The mutual allowance in the radial direction is set to 1.2 mm.

  Further, the inner peripheral surface of the distal end side portion 222 excluding the second engagement piece 224 of the receiving member 22 is formed to have a larger diameter than the inner peripheral surface of the proximal end side portion 221. Then, the inner peripheral surface of the distal end side portion 222 excluding the second engaging piece 224 and the inner peripheral surface of the proximal end side portion 221 protrude from the second engaging piece 224 inward in the radial direction. Connected by the pieces 225. The vertical surface 225a at the other end in the axial direction of the projecting piece 225 (the right end in FIG. 5) is connected to the first vertical surface 215 at the other end in the axial direction of the first engagement piece 214 of the opening member 21. When engaged with the longitudinal surface 220 at one end in the axial direction of the joint piece 224, it functions as a stopper that restricts further insertion of the insertion member 21 with respect to the receiving member 22, that is, movement in the insertion direction by contact. Have.

  The receiving member 22 is provided with a notch portion 23 that allows elastic deformation of each second engagement piece 224 in the outer diameter direction, that is, radially outward. Each notch 23 has slit-shaped first notch grooves 231 and 231 that axially cut both ends of each second engagement piece 224 in the axial direction, and one axial end of each second engagement piece 224. A slit-like second cutout groove 232 cut out in the circumferential direction is provided, and the first cutout groove 231 and the second cutout groove 232 form a substantially U-shape when viewed from the outside. In this case, each second engagement piece 224 is elastically deformed radially outward by the notch 23 so that the first engagement piece 214 can get over when engaged with the first engagement piece 214. The first vertical surface 215 at the other end in the axial direction of the first engagement piece 214 is engaged with the vertical surface 220 at one end in the axial direction of the second engagement piece 224.

Therefore, in the present embodiment, when joining one end of the first small diameter sheath tube 111 and the other end of the second small diameter sheath tube 112, the other end of the second small diameter sheath tube 112 is spun. The one end of the first small-diameter sheath tube 111 is fused and joined by spin weld to the inner peripheral surface of the distal end side portion 222 of the receiving member 22 fused and welded by the weld. When the outer peripheral surface of the distal end side portion 212 is inserted, a substantially U-shaped cutout portion 23 of the receiving member 22, that is, a slit-shaped first cut out in the axial direction at both circumferential ends of each second engagement piece 224. The notch grooves 231 and 231 and the slit-like second notch groove 232 that cuts one axial end of each second engagement piece 224 in the circumferential direction outwardly in the radial direction of each second engagement piece 224. Is allowed to be elastically deformed. Therefore, the first vertical surface 215 at the other end in the axial direction of the first engagement piece 214 of the opening member 21 and the vertical surface 220 at one end in the axial direction of each second engagement piece 224 of the receiving member 22 The vertical surfaces 215 and 220 of the first and second engagement pieces 214 and 224 are so arranged that the engagement of the first and second engagement pieces 214 and 224 can withstand the load caused by the thermal expansion and contraction of the respective small-diameter sheath tubes 11 (first and second small-diameter sheath tubes 111 and 112). Even when the engagement height of each of the second engagement pieces 224 is set to 1.2 mm, each of the second engagement pieces 224 is inserted when the insertion port member 21 is inserted into the reception member 22. The first vertical surface 215 of the first engagement piece 214 gets over the second engagement piece 224 by elastic deformation outward in the radial direction, and is smoothly and smoothly engaged with the vertical surface 220 of the second engagement piece 224. Match.
Thereby, when the first engagement piece 214 gets over each second engagement piece 224, the first engagement of the differential member 21 and the deformation of the reception member 22 to greatly expand the diameter of each second engagement piece 224. A large deformation of the first and second engaging pieces 214 and 224 such as a deformation for reducing the diameter of the piece 214 is not necessary, and the second engaging pieces of the first engaging piece 214 and the receiving member 22 of the outlet member 21 are not required. Deformation due to tearing or the like of 224 does not occur, and the bonding strength between the receiving member 22 and the insertion member 21 can be stably obtained.

In addition, it is not necessary to join the receiving member 22 and the outlet member 21 by the adhesive effect of the adhesive, and a large number of small-diameter sheath pipes 11 and large-diameter sheath pipes 12 laid in the buried pipe 10 during construction work. Adhesive application time and coagulation time are not required, and the construction work time can be greatly shortened, and the adverse effect on the environment during construction work due to the leakage of the adhesive into and out of the buried pipe 10 can be eliminated. Can do.
Furthermore, since no adhesive is required, the receiving member 22 and the connecting member 21 due to the weather during construction, how to apply each worker, insufficient insertion of the connecting member 21 with respect to the receiving member 22, etc. As a result, the quality of the joining state of the joint member does not vary, and the outlet member 21 is prevented from falling off from the receptacle member 22 due to these factors, and the joint state between the receptacle member 22 and the receptacle member 21 is improved. Can keep.

  Further, the outer peripheral surface of the first engagement piece 214 is formed in a taper shape having a small diameter toward one axial direction, and the inner peripheral surface of each second engagement piece 224 has a small diameter toward one axial direction. Since it is formed in a tapered shape, the tapered outer peripheral surface of the first engaging piece 214 smoothly smooths the tapered inner peripheral surface of each second engaging piece 224 when the insertion member 21 is inserted into the receiving member 22. The first engagement piece 214 can be smoothly and smoothly engaged with each second engagement piece 224.

  Further, since the first engagement piece 214 is provided so as to protrude radially outward from the distal end of the outer peripheral surface of the distal end side portion 212 of the opening member 21, the length of the first engagement piece 214 in the axial direction is long. And the length of each second engagement piece 224 in the axial direction is also shortened. For this reason, when the insertion member 21 is inserted into the receiving member 22, the elastic force due to the elastic deformation of each second engagement piece 224 in the inner and outer diameter direction acts greatly, and the first engagement piece 214 and each The engagement state with the two engagement pieces 224 can be strengthened.

  In addition, since the outlet member 21 is joined to one end portion of the first small diameter sheath tube 111 and the receiving member 22 is joined to the other end portion of the second small diameter sheath tube 112 by spin weld, The outlet member 21 is integrally joined to one end portion of the first small-diameter sheath tube 111 and the receiving member 22 is integrally joined to the other end portion of the second small-diameter sheath tube 112 without using an adhesive. It is possible to reliably eliminate the adverse effects on the environment during construction work due to the leakage of the adhesive into and out of the tube 10. Moreover, the quality of the joining state of the small diameter sheath pipes 111 and 112 with the adhesive member 21 and the receiving member 22 depending on the weather at the time of construction, how to apply the adhesive for each worker, etc. is eliminated. Therefore, the joining state of the small-diameter sheath pipes 111 and 112 can be satisfactorily maintained due to these factors.

  Further, the first vertical surface 215 of the first engagement piece 214 is connected to each second engagement piece 224 by the vertical surface 225 a at the other axial end of the projecting piece 225 provided on the inner peripheral surface of the receiving member 22. Since the movement of the opening member 21 in the insertion direction beyond the receiving member 22 is restricted when it is engaged with the vertical surface 220, the first engaging piece 214 is connected to each second engaging piece 224. The engagement state between the first engagement piece 214 and each second engagement piece 224 can be maintained smoothly.

  Furthermore, since the other axial end in the axial direction of the outer peripheral surface of the proximal end portion 211 of the outlet member 21 and the one axial end of the outer peripheral surface of the proximal end portion 221 of the receiving member 22 are chamfered, respectively. Each small diameter sheath tube 11 and each large diameter sheath tube 12 become difficult to be caught at both ends of the joining component 2 at the time of construction, and each small diameter sheath tube 11 and each large diameter sheath tube 12 can be constructed smoothly.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the configuration of the joining component is changed. The other configurations except for the joined parts are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in the present embodiment, as shown in FIG. 7, the joining component 3 includes a difference port member 31 as a difference port portion attached to one end portion of the first small diameter sheath tube 111, and a second small diameter sheath. And a receiving member 32 as a receiving portion attached to the other end of the tube 112. Each of the opening member 31 and the receiving member 32 is formed by injection molding a hard vinyl chloride resin. The differential port member 31 includes a distal end side portion 312 that is on one side in the axial direction (left side in FIG. 7) and a proximal end portion 311 that is on the other side in the axial direction (right side in FIG. 7). An insertion hole 313 through which the outer peripheral surface of one side end portion of the first small-diameter sheath tube 111 is inserted is provided in the proximal end side portion 311 of the differential port member 31. One side end portion of the first small-diameter sheath tube 111 inserted through the insertion hole 313 and the differential port member 31 are fused and integrally joined by relative rotation around the axis by spin weld.

  On the other hand, the receiving member 32 includes a proximal end portion 321 that is one side in the axial direction (left side in FIG. 7) and a distal end portion 322 that is the other end in the axial direction (right side in FIG. 7). An insertion hole 323 through which the outer peripheral surface of the other end portion of the second small diameter sheath tube 112 is inserted is provided in the proximal end portion 321 of the receiving member 32. The other end of the second small-diameter sheath tube 112 inserted through the insertion hole 323 and the receiving member 32 are fused and integrally joined by relative rotation around the axis by spin weld.

  In addition, as shown in FIG. 8, the outer peripheral surface of the distal end side portion 312 of the differential port member 31 protrudes radially outward from the distal end with a predetermined length (for example, about 8 mm) in the axial direction. One engagement piece 314 is provided. The first engagement piece 314 protrudes across the entire circumferential direction of the outer peripheral surface of the opening member 31. And the outer peripheral surface of the said 1st engagement piece 314 is formed in the taper shape used as a small diameter to the one side of an axial direction. Further, the outer peripheral surface of the distal end side portion 312 excluding the first engaging piece 314 of the differential port member 31 is formed to have a smaller diameter than the outer peripheral surface of the proximal end portion 311, and is a taper having a smaller diameter toward one side in the axial direction. It is formed in a shape. The outer peripheral surface of the first engagement piece 314 and the outer peripheral surface of the tip side portion 312 excluding the first engagement piece 314 are formed in a step shape, and the other side in the axial direction of the first engagement piece 314 is formed. The first vertical surfaces 315 at the ends are connected. Further, the outer peripheral surface of the base end side portion 311 and the outer peripheral surface of the tip end side portion 312 are formed in a step shape and are connected by a second vertical surface 316 at one end in the axial direction of the base end side portion 311. ing.

  On the other hand, as shown in FIG. 9, the inner peripheral surface of the distal end portion 322 of the receiving member 32 has a depth of a predetermined length (for example, about 20 mm) in the axial direction in the vicinity of the central portion thereof and radially inward. A protruding second engagement piece 324 is provided. The second engagement piece 324 protrudes over the entire circumferential direction of the inner peripheral surface of the receiving member 32. The second engagement piece 324 is formed in a tapered shape having an inner peripheral surface with a small diameter toward one side in the axial direction, and one end in the axial direction (the left end in FIG. 9) projects most radially inward. ing. In this case, the engagement between the first engagement piece 314 and the second engagement piece 324 can withstand the load caused by the thermal expansion and contraction of each small-diameter sheath tube 11 (first and second small-diameter sheath tubes 111 and 112). The engagement height between the first vertical surface 315 at the other end in the axial direction of the first engagement piece 314 and the vertical surface 320 at the one end in the axial direction of each second engagement piece 324 above. The mutual allowance in the radial direction is set to 1.2 mm.

  Further, the inner peripheral surface of the distal end side portion 322 excluding the second engagement piece 324 of the receiving member 32 is formed to have a larger diameter than the inner peripheral surface of the proximal end side portion 321. The inner peripheral surface of the distal end side portion 322 excluding the second engagement piece 324 and the inner peripheral surface of the proximal end portion 321 protrude from the second engagement piece 324 inward in the radial direction. Connected by the piece 325. The slope 325a at the other axial end of the projecting piece 325 (the right end in FIG. 9) is such that the first vertical surface 315 at the other axial end of the first engagement piece 314 of the insertion member 31 is the second engagement piece. When engaged with the vertical surface 320 at one end in the axial direction of 324, it has a function as a stopper for restricting movement of the insertion member 31 with respect to the receiving member 32 in the further insertion direction by contact. .

  The opening member 31 is provided with a notch 33 that allows elastic deformation of the first engagement piece 314 in the inner diameter direction, that is, inward in the radial direction. The notch 33 is provided with slit-like notches 331 for notching the first engagement pieces 314 in the axial direction at four locations at predetermined intervals (90 °) in the circumferential direction. Each notch groove 331 extends from the distal end of the distal end side portion 312 to the vicinity of the proximal end portion 321 and divides the first engagement piece 314 into four in the circumferential direction. In this case, each first engagement piece 314 is elastically deformed radially inward by the notch 33 so as to be able to get over the second engagement piece 324 when engaged with the second engagement piece 324. The first vertical surface 315 at the other end in the axial direction of the first engagement piece 314 is engaged with the vertical surface 320 at one end in the axial direction of the second engagement piece 324.

Therefore, in the present embodiment, when joining one end of the first small diameter sheath tube 111 and the other end of the second small diameter sheath tube 112, the other end of the second small diameter sheath tube 112 is spun. The one end portion of the first small-diameter sheath tube 111 is fused and joined by spin weld to the inner peripheral surface of the distal end side portion 322 of the receiving member 32 that is fused and joined by the weld. When the outer peripheral surface of the distal end side portion 312 is inserted, the notch 33 of the opening member 31, that is, the first engagement piece 314 is cut by the slit-like notch groove 331 that is notched in the axial direction at four places at predetermined intervals in the circumferential direction. The elastic deformation of each first engagement piece 314 in the radially inward direction is allowed. For this reason, each small diameter sheath tube 11 (first and second small diameter sheath tubes 111, 112) is engaged with each first engagement piece 314 of the outlet member 31 and the second engagement piece 324 of the receiving member 32. The height of engagement between the vertical surfaces 315 and 320 of the first and second engagement pieces 314 and 324 (the overlapping margin in the radial direction) is set to 1.2 mm so as to withstand the load caused by thermal expansion and contraction of Even when the insertion member 31 is inserted into the receiving member 32, the other end of each first engagement piece 314 in the axial direction is elastically deformed inward in the radial direction of each first engagement piece 314. The first vertical surface 315 gets over the second engagement piece 324 and smoothly and smoothly engages with the vertical surface 320 at one end in the axial direction of the second engagement piece 324.
Thereby, when each first engaging piece 314 gets over the second engaging piece 324, the first engaging piece of the outlet member 31 and the deformation that greatly expands the diameter of the second engaging piece 324 of the receiving member 32. A large deformation of the first and second engagement pieces 314 and 324, such as a deformation that reduces the diameter of the piece 314, is not necessary, and the first engagement pieces 314 of the opening member 31 and the second engagement pieces of the receiving member 32 are eliminated. Deformation due to 324 tears or the like does not occur, and the joining strength between the receiving member 32 and the outlet member 31 can be stably obtained.

  Further, the outer peripheral surface of each first engagement piece 314 is formed in a taper shape having a small diameter toward one side in the axial direction, and the inner peripheral surface of the second engagement piece 324 has a small diameter toward one side in the axial direction. Since it is formed in a tapered shape, the tapered outer peripheral surface of each first engagement piece 314 smoothly smoothes the tapered inner peripheral surface of the second engagement piece 324 when the insertion member 31 is inserted into the receiving member 32. The first engagement pieces 314 can be smoothly and smoothly engaged with the second engagement pieces 324.

Next, a third embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the configuration of the joining component is changed. The other configurations except for the joined parts are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  In other words, in the present embodiment, as shown in FIG. 10, the joining component 4 includes a difference port member 41 as a difference port portion attached to one side end of the first small diameter sheath tube 111, and a second small diameter sheath. And a receiving member 42 as a receiving portion attached to the other end of the tube 112. Each of the opening member 41 and the receiving member 42 is formed by injection molding a hard vinyl chloride resin. Moreover, the said opening member 41 consists of the front end side site | part 412 which becomes an axial direction one side (left side in FIG. 10), and the base end side site | part 411 which becomes an axial direction other side (right side in FIG. 10). An insertion hole 413 through which the outer peripheral surface of one side end portion of the first small-diameter sheath tube 111 is inserted is provided in the proximal end side portion 411 of the differential port member 41. One side end portion of the first small-diameter sheath tube 111 inserted through the insertion hole 413 and the opening member 41 are fused and integrally joined by relative rotation around the axis by spin weld.

  On the other hand, the receiving member 42 includes a proximal end portion 421 which is one side in the axial direction (left side in FIG. 10) and a distal end portion 422 which is the other side in the axial direction (right side in FIG. 10). An insertion hole 423 through which the outer peripheral surface of the other side end of the second small diameter sheath tube 112 is inserted is provided in the base end side portion 421 of the receiving member 42. The other end of the second small-diameter sheath tube 112 inserted through the insertion hole 423 and the receiving member 42 are fused and integrally joined by relative rotation around the axis by spin weld.

  Further, as shown in FIG. 11, the outer peripheral surface of the distal end side portion 412 of the opening member 41 has a depth of a predetermined length (for example, about 15 mm) in the axial direction from the distal end and protrudes radially outward. One engagement piece 414 is provided. The first engaging piece 414 continuously protrudes over the entire circumferential direction of the outer peripheral surface of the opening member 41. And the outer peripheral surface of the said 1st engagement piece 414 is formed in the taper shape used as a small diameter to the one side of an axial direction. Further, the outer peripheral surface of the distal end side portion 412 excluding the first engagement piece 414 of the differential port member 41 is formed to have a smaller diameter than the outer peripheral surface of the proximal end side portion 411, and is a taper having a smaller diameter toward one side in the axial direction. It is formed in a shape. The outer peripheral surface of the first engagement piece 414 and the outer peripheral surface of the tip side portion 412 excluding the first engagement piece 414 are formed in a step shape, and the other side in the axial direction of the first engagement piece 414 is formed. The first vertical surfaces 415 at the ends are connected. Further, the outer peripheral surface of the base end side portion 411 and the outer peripheral surface of the distal end side portion 412 are formed in a step shape and are connected by a second vertical surface 416 at one end in the axial direction of the base end side portion 411. ing.

  On the other hand, as shown in FIGS. 12 and 13, the inner peripheral surface of the distal end side portion 422 of the receiving member 42 has a depth of a predetermined length (for example, about 6 mm to 7 mm) in the axial direction in the vicinity of the central portion. A second engagement piece 424 protruding inward in the radial direction is provided. The second engaging pieces 424 protrude with a predetermined length (for example, about 8 mm to 10 mm) in the circumferential direction at four locations on the inner circumferential surface of the receiving member 42 at predetermined intervals in the circumferential direction. The second engaging piece 424 is formed in a tapered shape with a distal end portion (right end portion in FIG. 12) having a small diameter toward one side in the axial direction, and serves as a proximal end portion of the inner peripheral surface. One end portion in the axial direction (left end portion in FIG. 12) protrudes most radially inward. In this case, the engagement between the first engagement piece 414 and each second engagement piece 424 can withstand the load caused by the thermal expansion and contraction of each small-diameter sheath tube 11 (first and second small-diameter sheath tubes 111 and 112). In this case, the engagement height between the first vertical surface 415 at the other end in the axial direction of the first engagement piece 414 and the vertical surface 420 at the one end in the axial direction of each second engagement piece 424. The thickness (the overlap margin in the radial direction) is set to 1.2 mm.

  Further, the inner peripheral surface of the distal end side portion 422 excluding the second engagement piece 424 of the receiving member 42 is formed to have a larger diameter than the inner peripheral surface of the proximal end side portion 421. The inner peripheral surface of the distal end portion 422 and the inner peripheral surface of the proximal end portion 421 closer to the second small diameter sheath tube 112 than the respective second engaging pieces 424 are defined by the second engaging pieces 424. Further, they are connected by a projecting piece 425 projecting radially inward. The vertical surface 425a at the other end in the axial direction of the projecting piece 425 (right end in FIG. 12) is the first vertical surface 415 at the other end in the axial direction of the first engaging piece 414 of the opening member 41. It has a function as a stopper that restricts further movement of the insertion member 41 in the insertion direction relative to the receiving member 42 by contact when engaged with the vertical surface 420 at one end in the axial direction of the joint piece 424. ing.

  The receiving member 42 is provided with a notch 43 that allows elastic deformation of each second engagement piece 424 outward in the radial direction. Each notch 43 includes slit-shaped first notch grooves 431 and 431 that are notched in the axial direction at both ends in the circumferential direction of the second engagement pieces 424, and the other axial end of each second engagement piece 424 ( 12 is provided with slit-like second notch grooves 432 that are cut out in the circumferential direction, and each of the first notch grooves 431 and the second notch grooves 432 has a substantially U-shape when viewed from the outside. . Each of the first notch grooves 431 extends from the distal end of the second engagement piece 424 to the vicinity of the proximal end portion 421, and the second engagement piece 424 can be smoothly elastically deformed outward in the radial direction. I am doing so. In this case, each second engagement piece 424 is elastically deformed radially outward by the notch 43 so that the first engagement piece 414 can get over when engaged with the first engagement piece 414. A first vertical surface 415 at the other end in the axial direction of the first engagement piece 414 is engaged with a vertical surface 420 at one end in the axial direction of the second engagement piece 424.

Therefore, in the present embodiment, when joining one end of the first small diameter sheath tube 111 and the other end of the second small diameter sheath tube 112, the other end of the second small diameter sheath tube 112 is spun. Of the front end portion 422 of the receiving end member 422 which is fused and welded by the weld, and the one end portion of the first small diameter sheath tube 111 is fused and joined by the spin weld. When the outer peripheral surface of the distal end side portion 412 is inserted, a substantially U-shaped cutout portion 43 of the receiving member 42, that is, a slit-shaped first cut out in the axial direction at both circumferential ends of each second engagement piece 424. The notch grooves 431 and 431 and a slit-like second notch groove 432 that cuts the other end in the axial direction of each second engagement piece 424 in the circumferential direction outwardly in the radial direction of each second engagement piece 424. Is allowed to be elastically deformed. For this reason, the engagement between the first engagement piece 414 of the outlet member 41 and each second engagement piece 424 of the receiving member 42 is performed for each small-diameter sheath tube 11 (first and second small-diameter sheath tubes 111 and 112). The height of engagement between the vertical surfaces 415 and 420 of the first and second engagement pieces 414 and 424 (the overlap margin in the radial direction) is set to 1.2 mm so that the load due to thermal expansion and contraction of the first and second engagement pieces 414 and 424 can withstand. Even when the insertion port member 41 is inserted into the receiving member 42, the second engaging piece 424 is elastically deformed outward in the radial direction so that the first engaging piece 414 has the other end in the axial direction. The first vertical surface 415 gets over each second engagement piece 424 and smoothly and smoothly engages with the vertical surface 420 at one end in the axial direction of each second engagement piece 424.
As a result, when the first engagement piece 414 gets over each second engagement piece 424, the first engagement of the differential member 41 and the deformation that greatly increases the diameter of each second engagement piece 424 of the receiving member 42. A large deformation of the first and second engaging pieces 414 and 424 such as a deformation for reducing the diameter of the piece 414 is not necessary, and the second engaging pieces of the first engaging piece 414 of the opening member 41 and the receiving member 42 are eliminated. Deformation due to 424 tears or the like does not occur, and the joining strength between the receiving member 42 and the outlet member 41 can be stably obtained.

  Further, the distal end portion of the outer peripheral surface of the first engagement piece 414 is formed in a taper shape having a small diameter toward one side in the axial direction, and the inner peripheral surface of each second engagement piece 424 is directed toward one side in the axial direction. Since it is formed in a tapered shape having a small diameter, the tapered outer peripheral surface of the first engagement piece 414 is the tapered inner periphery of each second engagement piece 424 when the insertion member 41 is inserted into the receiving member 42. The first engagement piece 414 can be smoothly and smoothly engaged with each second engagement piece 424 by overcoming the surface smoothly.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the configuration of the joining component is changed. The other configurations except for the joined parts are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  In other words, in the present embodiment, as shown in FIG. 14, the joining component 5 includes a difference port member 51 as a difference port portion attached to one side end of the first small diameter sheath tube 111, and a second small diameter sheath. And a receiving member 52 as a receiving portion attached to the other end of the tube 112. Each of the opening member 51 and the receiving member 52 is formed by injection molding a hard vinyl chloride resin. Further, the opening member 51 includes a distal end side portion 512 that is one side in the axial direction (left side in FIG. 14) and a proximal end side portion 511 that is the other side in the axial direction (right side in FIG. 14). An insertion hole 513 through which the outer peripheral surface of the one side end portion of the first small diameter sheath tube 111 is inserted is provided in the proximal end side portion 511 of the differential port member 51. One side end portion of the first small-diameter sheath tube 111 inserted through the insertion hole 513 and the differential member 51 are fused and integrally joined by relative rotation around the axis by the spin weld.

  On the other hand, the receiving member 52 includes a proximal end portion 521 that is on one side in the axial direction and a distal end portion 522 that is on the other side in the axial direction. An insertion hole 523 through which the outer peripheral surface of the other end portion of the second small-diameter sheath tube 112 is inserted is provided in the proximal end portion 521 of the receiving member 52. The other end portion of the second small-diameter sheath tube 112 inserted through the insertion hole 523 and the receiving member 52 are fused and integrally joined by relative rotation around the axis by spin weld.

  Further, as shown in FIGS. 15 and 16, the outer peripheral surface of the distal end side portion 512 of the opening member 51 has a radius of a predetermined length (for example, about 6 mm to 8 mm) in the axial direction near the center thereof. A first engagement piece 514 protruding outward in the direction is provided. The first engaging pieces 514 have a predetermined length (for example, about 8 mm to 10 mm) in the circumferential direction at four positions at predetermined intervals in the circumferential direction on the inner peripheral surface of the opening member 51, respectively. It protrudes. Each of the first engagement pieces 514 is formed in a taper shape having a distal end side (left side in FIG. 15) having a small diameter toward one side in the axial direction, and the axial direction serving as a proximal end portion of the outer peripheral surface. The other end (the right end in FIG. 15) protrudes outward in the radial direction. Further, the outer peripheral surface of the distal end side portion 512 excluding the first engagement piece 514 of the differential port member 51 is formed to have a smaller diameter than the outer peripheral surface of the proximal end side portion 511. The outer peripheral surface of the first engagement piece 514 and the outer peripheral surface of the tip side portion 512 excluding the first engagement piece 514 are formed in a step shape, and the other side in the axial direction of the first engagement piece 514 The first vertical surfaces 515 at the ends are connected. Further, the outer peripheral surface of the base end side portion 511 and the outer peripheral surface of the distal end side portion 512 are formed in a step shape and are connected by a second vertical surface 516 at one end in the axial direction of the base end side portion 511. ing.

  On the other hand, as shown in FIG. 17, the inner peripheral surface of the distal end portion 522 of the receiving member 52 protrudes radially inward with a predetermined length (for example, about 15 mm) in the axial direction at the distal end. A second engagement piece 524 is provided. The second engaging piece 524 protrudes over the entire circumferential direction of the inner peripheral surface of the receiving member 52. In this case, the engagement between each first engagement piece 514 and the second engagement piece 524 can withstand the load caused by the thermal expansion and contraction of each small-diameter sheath tube 11 (first and second small-diameter sheath tubes 111 and 112). Therefore, the engagement height between the first vertical surface 515 at the other axial end of each first engagement piece 514 and the vertical surface 520 at one axial end of the second engagement piece 524 of the differential member 51. The thickness (the overlap margin in the radial direction) is set to 1.2 mm.

  Further, the inner peripheral surface of the distal end side portion 522 excluding the second engagement piece 524 of the receiving member 52 is formed to have a larger diameter than the inner peripheral surface of the proximal end side portion 521. Then, the inner peripheral surface of the distal end side portion 522 excluding the second engagement piece 524 and the inner peripheral surface of the proximal end portion 521 protrude from the second engagement piece 524 inward in the radial direction. Connected by the pieces 525. The vertical surface 525a at the other end in the axial direction of the projecting piece 525 (the right end in FIG. 17) is the second vertical surface 515 at the other end in the axial direction of each first engagement piece 514 of the opening member 51. When engaging with the longitudinal surface 520 at one end in the axial direction of the joint piece 524, it has a function as a stopper that restricts further movement of the insertion member 51 in the insertion direction relative to the receiving member 52 by contact. ing.

  As shown in FIGS. 15 and 16, the opening member 51 is provided with a notch 53 that allows elastic deformation of each first engagement piece 514 inward in the radial direction. The notch 53 has a slit-like first notch groove 531, 531 that axially cuts both circumferential ends of each first engagement piece 514, and one axial end of each first engagement piece 514 around the one end in the axial direction. The first notch groove 531 and the second notch groove 532 have a substantially U-shape when viewed from the outside. Further, each first notch groove 531 is notched from both ends of the second notch groove 532 to the vicinity of the proximal side portion 511 so that elastic deformation of each first engagement piece 514 radially inward is allowed. It is. In this case, each first engagement piece 514 is elastically deformed radially inward by the notch 53 so as to be able to get over the second engagement piece 524 when engaged with the second engagement piece 524. The first vertical surface 515 at the other end in the axial direction of the first engagement piece 514 is engaged with the vertical surface 520 at the one end in the axial direction of the second engagement piece 524.

Therefore, in the present embodiment, when joining one end of the first small diameter sheath tube 111 and the other end of the second small diameter sheath tube 112, the other end of the second small diameter sheath tube 112 is spun. The one end of the first small-diameter sheath tube 111 is fused and joined by spin weld to the inner peripheral surface of the distal end side portion 522 of the receiving member 52 fused and joined by weld. When the outer peripheral surface of the distal end side portion 512 is inserted, slit-like first notch grooves 531, 531 that are notched in the axial direction in the notch 53 of the opening member 51, that is, both circumferential ends of each first engagement piece 514, The first engaging piece 514 is allowed to elastically deform inward in the radial direction by the slit-like second notch groove 532 that cuts one axial end of each first engaging piece 514 in the circumferential direction. The For this reason, the first and the second engagement pieces 514 of the opening member 51 and the second engagement pieces 524 of the receiving member 52 can be engaged with the first and second loads so that they can withstand the load caused by the thermal expansion and contraction of the small diameter sheath tubes 11. Even if the height of engagement between the vertical surfaces 515 and 520 of the second engaging pieces 514 and 524 (the overlapping margin in the radial direction) is set to 1.2 mm, the opening member is different from the receiving member 52. When the first engagement piece 514 is inserted through the first engagement piece 514, the first vertical surface 515 at the other end in the axial direction of the first engagement piece 514 becomes the second engagement piece 524. And the second engagement piece 524 is smoothly and smoothly engaged with the vertical surface 520 at one end in the axial direction.
Thereby, when each first engagement piece 514 rides over the second engagement piece 524, the first engagement of the differential member 51 and the deformation that greatly increases the diameter of the second engagement piece 524 of the receiving member 52. Large deformation of the first and second engagement pieces 514 and 524, such as deformation that reduces the diameter of the piece 514, is unnecessary, and each first engagement piece 514 of the opening member 51 and second engagement piece of the receiving member 52 are eliminated. Deformation due to laceration or the like of 524 does not occur, and the bonding strength between the receiving member 52 and the outlet member 51 can be obtained stably.

  Further, the outer peripheral surface of each of the first engagement pieces 514 is formed in a tapered shape having a small diameter toward one side in the axial direction, and the inner peripheral surface of the second engagement piece 524 has a small diameter toward one side in the axial direction. Since it is formed in a tapered shape, the tapered outer peripheral surface of each first engagement piece 514 smoothly smooths the tapered inner peripheral surface of the second engagement piece 524 when the insertion member 51 is inserted into the receiving member 52. The first engaging pieces 514 can be smoothly and smoothly engaged with the second engaging pieces 524.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the configuration of the joining component is changed. The other configurations except for the joined parts are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in the present embodiment, as shown in FIG. 18, the joining component 6 includes a difference port member 61 as a difference port portion attached to one end portion of the first small diameter sheath tube 111, and a second small diameter sheath. And a receiving member 62 as a receiving portion attached to the other end of the tube 112. Each of the opening member 61 and the receiving member 62 is formed by injection molding a hard vinyl chloride resin. Further, the opening member 61 includes a distal end side portion 612 which is one side in the axial direction (left side in FIG. 18) and a proximal end side portion 611 which is the other side in the axial direction (right side in FIG. 18). An insertion hole 613 through which the outer peripheral surface of one side end portion of the first small diameter sheath tube 111 is inserted is provided in the proximal end portion 611 of the differential port member 61. The one end portion of the first small-diameter sheath tube 111 inserted through the insertion hole 613 is fused and integrally joined by relative rotation around the axis by the spin weld.

  On the other hand, the receiving member 62 includes a proximal end side portion 621 which is one side in the axial direction (left side in FIG. 18) and a distal end side portion 622 which is the other side in the axial direction (right side in FIG. 18). An insertion hole 623 through which the outer peripheral surface of the other end portion of the second small-diameter sheath tube 112 is inserted is provided in the proximal end portion 621 of the receiving member 62. The other end of the second small-diameter sheath tube 112 inserted through the insertion hole 623 and the receiving member 62 are fused and integrally joined by relative rotation around the axis by spin weld.

  Further, as shown in FIGS. 19 and 20, the outer peripheral surface of the distal end portion 612 of the outlet member 61 has a predetermined length (for example, about 15 mm) in the axial direction in the vicinity of the central portion thereof and is radially outward. A first engagement piece 614 protruding in the direction is provided. The first engaging pieces 614 protrude outward in the radial direction with a predetermined width (for example, about 8 mm to 10 mm) in the circumferential direction at four positions at predetermined intervals in the circumferential direction of the outer peripheral surface of the opening member 61. ing. Each of the first engagement pieces 614 is formed in a tapered shape with an outer peripheral surface having a small diameter toward one side in the axial direction, and the other end in the axial direction (the right end in FIG. 19) projects most outward in the radial direction. ing. Further, the outer peripheral surface of the distal end side portion 612 excluding the first engaging pieces 614 of the differential port member 61 is formed to have a smaller diameter than the outer peripheral surface of the proximal end side portion 611. And the outer peripheral surface of each said 1st engagement piece 614 and the outer peripheral surface of the front end side site | part 612 except this each 1st engagement piece 614 are formed in step shape, and the axis line of each said 1st engagement piece 614 It is connected by a first vertical surface 615 at the other end in the direction. In addition, the outer peripheral surface of the proximal end portion 611 and the outer peripheral surface of the distal end portion 612 are formed in a step shape and are connected by a second vertical surface 616 at one end in the axial direction of the proximal end portion 611. ing.

  On the other hand, as shown in FIG. 21, the inner peripheral surface of the distal end side portion 622 of the receiving member 62 has a depth of a predetermined length (for example, about 6 mm to 7 mm) in the axial direction from the distal end thereof inward in the radial direction. A protruding second engagement piece 624 is provided. The second engaging piece 624 protrudes radially inward over the entire circumferential direction of the inner peripheral surface of the receiving member 62. In this case, the engagement between each first engagement piece 614 and the second engagement piece 624 can withstand the load caused by the thermal expansion and contraction of each small-diameter sheath tube 11 (first and second small-diameter sheath tubes 111 and 112). In doing so, the engagement height between the first vertical surface 615 at the other axial end of each first engagement piece 614 of the outlet member 61 and the vertical surface 620 at one axial end of the second engagement piece 624. The thickness (the overlap margin in the radial direction) is set to 1.2 mm.

  Further, the inner peripheral surface of the distal end side portion 622 excluding the second engagement piece 624 of the receiving member 62 is formed to have a larger diameter than the inner peripheral surface of the proximal end side portion 621. Further, the inner peripheral surface of the distal end side portion 622 excluding the second engagement piece 624 and the inner peripheral surface of the proximal end side portion 621 protrude from the second engagement piece 624 inward in the radial direction. Connected by pieces 625. The vertical surface 625a at the other end in the axial direction of the projecting piece 625 (right end in FIG. 21) is the second vertical surface 615 at the other end in the axial direction of the first engagement piece 614 of the opening member 61. When engaging with the longitudinal surface 620 at one end in the axial direction of the joint piece 624, it has a function as a stopper that restricts further movement of the insertion member 61 in the insertion direction relative to the receiving member 62 by contact. ing.

  As shown in FIGS. 19 and 20, the opening member 61 is provided with a notch 63 that allows elastic deformation of each first engagement piece 614 inward in the radial direction. The notch 63 has slit-like first notch grooves 631 and 631 that are notched in the axial direction at both ends in the circumferential direction of each first engagement piece 614, and the other axial end of each first engagement piece 614 (see FIG. 19 is provided with a slit-like second notch groove 632 that is notched in the circumferential direction, and each of the first notch groove 631 and the second notch groove 632 has a substantially U-shape when viewed from the outside. Each first notch groove 631 is notched from both ends of the second notch groove 632 to the vicinity of the tip of the distal end side portion 612 so that elastic deformation of each first engagement piece 614 radially inward is allowed. It is. In this case, each first engagement piece 614 is elastically deformed radially inward by the notch 63 so as to get over the second engagement piece 624 when engaged with the second engagement piece 624, and The first vertical surface 615 at the other end in the axial direction of the first engagement piece 614 is engaged with the vertical surface 620 at one end in the axial direction of the second engagement piece 624.

Therefore, in the present embodiment, when joining one end of the first small diameter sheath tube 111 and the other end of the second small diameter sheath tube 112, the other end of the second small diameter sheath tube 112 is spun. The one end of the first small-diameter sheath tube 111 is fused and joined by spin weld to the inner peripheral surface of the distal end side portion 622 of the receiving member 62 which is fused and welded by the weld. When the outer peripheral surface of the distal end side portion 612 is inserted, a substantially U-shaped cutout portion 63 of the receiving member 62, that is, a slit-shaped first cut out in the axial direction at both circumferential ends of each second engagement piece 624. The notch grooves 631 and 631 and the slit-like second notch groove 632 in which the other end in the axial direction of each first engagement piece 614 is notched in the circumferential direction are inward in the radial direction of each first engagement piece 614. Is allowed to be elastically deformed. For this reason, each small diameter sheath pipe 11 (first and second small diameter sheath pipes 111 and 112) is engaged with each first engagement piece 614 of the outlet member 61 and the second engagement piece 624 of the mouthpiece member 62. The height of engagement between the vertical surfaces 615 and 620 of the first and second engagement pieces 614 and 624 (the mutual overlap allowance in the radial direction) is set to 1.2 mm so that the load due to thermal expansion and contraction of the first and second engagement pieces 614 and 624 can withstand. Even when the insertion port member 61 is inserted into the receiving member 62, the first engagement piece 614 is elastically deformed inward in the radial direction, and the first engagement piece 614 has an axial end at the other end. The first vertical surface 615 climbs over the second engagement piece 624 and smoothly and smoothly engages with the vertical surface 620 at one end in the axial direction of each second engagement piece 624.
As a result, when each first engagement piece 614 gets over the second engagement piece 624, deformation of the receiving member 62 to greatly increase the diameter of each second engagement piece 624 and the first engagement of the opening member 61. A large deformation of the first and second engaging pieces 614 and 624 such as a deformation for reducing the diameter of the piece 614 is not required, and the first engaging pieces 614 of the opening member 61 and the second engaging pieces of the receiving member 62 are eliminated. Deformation due to 624 tears or the like does not occur, and the joint strength between the receiving member 62 and the outlet member 61 can be stably obtained.

  Moreover, since the outer peripheral surface of each said 1st engagement piece 614 is formed in the taper shape used as a small diameter to the one side of an axial direction, each 1st engagement piece 614 is inserted at the time of the insertion of the port member 61 with respect to the receiving member 62. The taper-shaped outer peripheral surface can smoothly pass over the inner peripheral surface of the second engagement piece 624, and each first engagement piece 614 can be smoothly and smoothly engaged with the second engagement piece 624.

Next, a sixth embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the configuration of the joining component is changed. The other configurations except for the joined parts are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in the present embodiment, as shown in FIG. 22, the joining component 8 includes a difference port member 81 as a difference port portion attached to one end portion of the first small diameter sheath tube 111, and a second small diameter sheath. And a receiving member 82 as a receiving portion attached to the other end of the tube 112. Each of the opening member 81 and the receiving member 82 is formed by injection molding of a hard vinyl chloride resin.

  23, as shown in FIG. 23, the front end portion 812 which is one side in the axial direction (left side in FIG. 23) and the base end side portion 811 which is the other side in the axial direction (right side in FIG. 23). It consists of. An insertion hole 813 through which the outer peripheral surface of the one side end portion of the first small-diameter sheath tube 111 is inserted is provided in the proximal end side portion 811 of the differential port member 81. The one end portion of the first small-diameter sheath tube 111 inserted through the insertion hole 813 and the opening member 81 are fused and integrally joined by relative rotation around the axis by spin weld.

  On the other hand, as shown in FIG. 24, the receiving member 82 includes a proximal end side portion 821 on one side in the axial direction (left side in FIG. 24) and a distal end side portion 822 on the other side in the axial direction (right side in FIG. 24). It consists of. An insertion hole 823 through which the outer peripheral surface of the other end of the second small-diameter sheath tube 112 is inserted is provided in the proximal end portion 821 of the receiving member 82. The other end of the second small-diameter sheath tube 112 inserted through the insertion hole 823 and the receiving member 82 are fused and integrally joined by relative rotation around the axis by spin weld.

  Further, a first engagement piece 814 is provided on the outer peripheral surface of the distal end side portion 812 of the opening member 81 so as to protrude outward in the radial direction with a predetermined length (for example, about 8 mm) in the axial direction from the distal end. It has been. The first engagement piece 814 continuously protrudes over the entire circumferential direction of the outer peripheral surface of the opening member 81. And the outer peripheral surface of the said 1st engagement piece 814 is formed in the taper shape used as a small diameter to the axial direction one side (FIG. 23 left side) of the said opening member 81. As shown in FIG. Further, the outer peripheral surface of the distal end side portion 812 excluding the first engagement piece 814 of the opening member 81 is formed to have a smaller diameter than the outer peripheral surface of the proximal end side portion 811, and has a smaller diameter toward one side in the axial direction of the opening member 81. It is formed in a tapered shape. The outer peripheral surface of the first engagement piece 814 and the outer peripheral surface of the tip side portion 812 excluding the first engagement piece 814 are formed in a step shape, and the other end in the axial direction of the first engagement piece 814 is formed. They are connected by a first vertical surface 815 (right end in FIG. 23). In addition, the outer peripheral surface of the proximal end portion 811 and the outer peripheral surface of the distal end portion 812 are formed in a step shape and are connected by a second vertical surface 816 at one end in the axial direction of the proximal end portion 811. .

  On the other hand, on the inner peripheral surface of the distal end side portion 822 of the receiving member 82, a second engagement piece projecting radially inward with a predetermined length (for example, about 15 mm) in the axial direction near the center. 824 is provided. The second engaging pieces 824 protrude with a predetermined length (for example, about 8 mm to 10 mm) in the circumferential direction at four locations on the inner peripheral surface of the receiving member 82 at predetermined intervals in the circumferential direction. And the 2nd engagement piece 824 is formed in the taper shape from which the internal peripheral surface becomes small diameter to the axial direction one side (FIG. 24 left side) of the receiving member 82, and the axial direction one side end (in FIG. 24) The left end protrudes most radially inward. In this case, the engagement height between the first vertical surface 815 at the other end in the axial direction of the first engagement piece 814 and the vertical surface 820 at one end in the axial direction of each second engagement piece 824. The mutual allowance in the radial direction is set to 1.2 mm.

  Further, the inner peripheral surface of the distal end side portion 822 excluding the second engagement piece 824 of the receiving member 82 is formed to have a larger diameter than the inner peripheral surface of the proximal end side portion 821. The inner peripheral surface of the distal end side portion 822 excluding the second engagement piece 824 and the inner peripheral surface of the proximal end side portion 821 protrude from the second engagement piece 824 inward in the radial direction. Connected by the pieces 825. The vertical surface 825a at the other end in the axial direction of the projecting piece 825 (the right end in FIG. 24) is connected to the first vertical surface 815 at the other end in the axial direction of the first engagement piece 814 of the opening member 821. When engaged with the longitudinal surface 820 at one end in the axial direction of the joint piece 824, it functions as a stopper that restricts further insertion of the insertion member 81 with respect to the receiving member 82, that is, movement in the insertion direction by contact. Have.

  As shown also in FIG. 25, the outer diameter of the outer peripheral surface of the distal end portion 812 of the opening member 81 is set to the outer diameter of the outer end of the other axial direction. An annular enlarged diameter portion 83 that is uniformly enlarged in diameter is integrally provided. The enlarged diameter portion 83 is formed on the inner peripheral surface of the distal end portion 822 of the receiving member 82 when the distal end portion 812 of the outlet member 81 is inserted into and joined to the distal end portion 822 of the receiving member 82. The end on the other side in the axial direction is fitted into the end on the other side in the axial direction of the outer peripheral surface of the distal end portion 812 of the opening member 81 without any gap in the radial direction. In addition, a tapered surface 831 is integrally provided on one side in the axial direction of the enlarged diameter portion 83 so as to reduce the diameter of the enlarged diameter portion 83 toward the one side in the axial direction on the outer peripheral surface of the opening member 81.

  Furthermore, as shown in FIG. 26, the end of each second engagement piece 824 on one side in the axial direction, that is, the tip of each second engagement piece 824 (the end on one side in the axial direction) and the projection piece 825. Between the longitudinal surface 825a at the other end in the axial direction, a through-hole 827 that penetrates radially outward of the receiving portion 82 along the tip (end surface) of each second engagement piece 824 is provided. . Each through-hole 827 is formed on the outer side in the radial direction of four slide cores K (only three are shown in FIG. 26) of a mold (not shown) that forms the receiving member 82 by injection molding of hard vinyl chloride resin. Served to slide towards. In this case, the slide core K slides between the inner peripheral end of each second engagement piece 824 tip and the outer peripheral end of each second engagement piece 824 tip end. .

  Therefore, in the present embodiment, when the distal end portion 812 of the outlet member 81 is inserted and joined to the distal end portion 822 of the receiving member 82, the inner peripheral surface of the distal end portion 822 of the receiving member 82 is joined. The end portion on the other side in the axial direction is fitted into the end portion on the other side in the axial direction on the outer peripheral surface of the distal end side portion 812 without any gap in the radial direction. For this reason, there is no play between the end on the other side in the axial direction on the outer peripheral surface of the distal end side portion 812 of the outlet member 81 and the end on the other side in the axial direction of the inner peripheral surface of the front end side portion 822 of the receiving member 82. No stickiness occurs. Thereby, even if it uses in the corner part with a curve, the level | step difference by bending does not arise between the port member 81 and the port member 82, and the damage by the level | step difference to the communication cable etc. which were accommodated in the inside is prevented. be able to.

  In addition, a tapered surface 831 is provided on one side in the axial direction of the enlarged diameter portion 83 to reduce the diameter of the enlarged diameter portion 83 toward the one side in the axial direction on the outer peripheral surface of the distal end side portion of the opening member 81. For this reason, when the insertion member 81 is inserted and joined to the receiving member 82, the end portion on the other side in the axial direction of the inner peripheral surface of the distal end portion 822 of the receiving member 82 is the distal end portion of the opening member 81. It is smoothly guided along the tapered surface 831 to the enlarged diameter portion 83 (the end portion on the other side in the axial direction) of the outer peripheral surface of 812. Thereby, the operation | work at the time of making the port member 81 penetrate the port member 82 and joining can be performed smoothly.

  Further, between the distal end of each second engagement piece 854 and the longitudinal surface 855a of the other end in the axial direction of the projecting piece 855, the receiving portion 82 is radially outward along the distal end of each second engagement piece 824. Since the through-holes 827 penetrating in the direction are provided, in forming each second engagement piece 824, the mold slide core K may be slid radially outward through each through-hole 827. . Thereby, the structure of the mold for molding the inner peripheral surface of the receiving member 82 can be made very simple.

  In the present embodiment, an annular diameter-enlarged portion 83 in which the outer diameter of the outer peripheral surface of the distal end portion 812 of the front end member 81 is uniformly expanded radially outward at the other end in the axial direction. 27, as shown in FIG. 27, each of the axial lines at three positions at predetermined intervals in the circumferential direction (for example, at 120 ° intervals) at the other end in the axial direction of the outer peripheral surface of the distal end portion 812 of the opening member 81 is provided. A diameter-expanded portion 84 that extends intermittently in the circumferential direction, in which the outer diameter of the end portion on the other side in the direction is uniformly expanded radially outward, may be provided. In this case, the diameter-expanded portion 84 is not limited to three locations, and may be provided at four or more locations at predetermined intervals in the circumferential direction. Further, a taper surface for reducing the diameter of each enlarged diameter portion toward the axial direction side on the outer peripheral surface of the distal end side portion of the differential member may be provided on one axial direction side of each enlarged diameter portion. Needless to say, it is good.

Next, a seventh embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the configuration of the receiving member is changed. The other configuration except for the receiving member is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in the present embodiment, as shown in FIG. 28, the receiving member 85 (receiving portion) is attached to the other end of the second small-diameter sheath tube 112, and a hard polyvinyl chloride resin is injection-molded. It is formed. The receiving member 85 includes a proximal end portion 851 that is one side in the axial direction (left side in FIG. 28) and a distal end portion 852 that is the other side in the axial direction (right side in FIG. 28). An insertion hole 853 through which the outer peripheral surface of the other end portion of the second small-diameter sheath tube 112 is inserted is provided in the proximal end portion 851 of the receiving member 85. The other end portion of the second small-diameter sheath tube 112 inserted into the insertion hole 853 and the receiving member 85 are fused and integrally joined by relative rotation around the axis by spin weld.

  Further, a second engagement piece that protrudes inward in the radial direction with a predetermined length (for example, about 6 mm to 7 mm) in the axial direction from the front end of the inner peripheral surface of the front end side portion 852 of the receiving member 85. 854 is provided. The second engaging pieces 854 protrude inward in the radial direction from four locations at predetermined intervals (approximately 90 °) in the circumferential direction of the inner circumferential surface of the receiving member 85. In this case, the engagement between the first engagement piece 214 and the second engagement piece 854 of the differential port member 21 is a load due to thermal expansion and contraction of the small diameter sheath pipes 11 (first and second small diameter sheath pipes 111 and 112). The first vertical surface 215 at the other axial end of each first engagement piece 214 of the differential port member 21 and the vertical surface 850 at one axial end of the second engagement piece 854. The height of engagement with each other (the overlapping margin in the radial direction) is set to 1.2 mm.

  The inner peripheral surface of the distal end side portion 852 excluding the second engagement piece 854 of the receiving member 85 is formed to have a larger diameter than the inner peripheral surface of the proximal end side portion 851. Then, the inner peripheral surface of the distal end side portion 852 and the inner peripheral surface of the proximal end side portion 851 excluding the second engagement piece 854 protrude from the second engagement piece 854 in the radially inward direction. Are connected by The vertical surface 855a at the other end in the axial direction (right end in FIG. 28) of the projecting piece 855 is the second vertical surface 215 at the other end in the axial direction of each first engagement piece 214 of the opening member 21. When engaging with the longitudinal surface 854a at one end in the axial direction of the joint piece 854, it has a function as a stopper that restricts further movement of the insertion member 21 in the insertion direction relative to the receiving member 85 by contact. ing.

  29, on the outer peripheral surface of each of the second engagement pieces 854, a single rib extending in the axial direction of the receiving member 85 from the tip (left end in FIG. 28) at the circumferential center position. 856 is provided integrally. The rib 856 is set such that the height of the receiving member 85 in the radial direction is 2 mm or less and the circumferential width is about 3 mm or less. This is set in consideration of the accommodation property in the buried pipe 10 and the insertion property of the outlet member 21. Further, the length of the rib 856 in the axial direction is set to be longer than the length from the distal end of the second engagement piece 854 to the proximal end (right end in FIG. 28). The rib 856 becomes easy to be fixed by a rotating device (not shown) at the time of joining to the other side end portion of the second small-diameter sheath tube 112 by spin weld, and the receiving member 85 between the rotating device and the rib 856 is fixed. Slip in the circumferential direction can be prevented. As shown in FIGS. 30 and 31, the small-diameter sheath tube 11 and the large-diameter sheath tube 12 are embedded in the buried tubes 10 and 10 ′ having different sizes, with the restriction by the ribs 856 being suppressed as much as possible. Respectively.

  Therefore, in the present embodiment, the ribs 856 that extend in the axial direction of the receiving member 85 from the front end thereof are integrally provided on the outer peripheral surface of each second engagement piece 854. The rigidity of 854 is improved by the rib 856, and the strength against buckling of the receiving member 85 can be increased. In addition, when the receiving member 85 is joined to the other end of the second sheath tube 112 in the axial direction by spin welding, the receiving member 85 can be smoothly fixed to the rotating device by using the rib 856. The receiving member 85 can be easily fixed.

  In the present embodiment, a single rib 856 extending from the tip in the axial direction of the receiving member 85 is provided on the outer peripheral surface of each second engagement piece 854 at the center in the circumferential direction. A plurality of ribs extending in the axial direction of the receiving member from the front end thereof may be provided on the outer peripheral surface of the combined piece. In this case, the rigidity of each second engagement piece 854 is further improved by the plurality of ribs, and the strength against buckling of the receiving member 85 can be further increased.

In the present embodiment, the rigidity of the four second engagement pieces 854 is improved by the ribs 856 on the outer peripheral surface, but the length of each second engagement piece and the circumferential length (width) are set. It may be set optimally to improve the rigidity of the second engagement piece.
Specifically, the length of the portion excluding the circumferential length of the four second engaging pieces and the first notch grooves 231 at both circumferential ends of the second engaging piece from the circumferential length of the tip side portion. Since the length in the circumferential direction contributes to the tensile strength, it is necessary in the range of 30.7 ° or more for each small-diameter sheath tube, and in the range of 26.7 ° or more for each large-diameter sheath tube. Therefore, in consideration of safety, the circumferential length in the range of 37 ° is secured for each small-diameter sheath tube, and the circumferential length in the range of 42 ° is secured for each large-diameter sheath tube. In addition, the circumferential length of the second engagement piece of each large diameter sheath tube and each small diameter sheath tube may be set in a range of 39 °. Further, the length in the axial direction of each second engagement piece may be set to be equal to or less than the circumferential length of each second engagement piece from half the circumferential length of each second engagement piece.
Thus, by setting the circumferential length and the axial length of each second engagement piece, it is possible to increase the strength against buckling of the receiving member 85 while resisting the tensile load. .

Next, an eighth embodiment of the present invention will be described with reference to FIG.
In this embodiment, the opening member and the receiving member are formed of a transparent hard vinyl chloride resin. In addition, the structure except shape | molding a spout member and a receiving member with transparent hard polyvinyl chloride resin is the same as that of the said 1st Embodiment, The same code | symbol is attached | subjected about the same part and the detailed description is given. Is omitted.

  That is, in the present embodiment, as shown in FIG. 32, the joining component 9 includes a port member 91 as a port portion made of a transparent hard vinyl chloride resin that can be seen through, and a transparent hard vinyl chloride that can be seen through. A receiving member 92 as a receiving portion made of resin is provided. The differential port member 91 includes a distal end side portion 912 on one side in the axial direction (left side in FIG. 32) and a proximal end side portion 911 on the other side in the axial direction (right side in FIG. 32). On the other hand, the receiving member 92 includes a proximal end portion 921 on one side in the axial direction and a distal end portion 922 on the other side in the axial direction. A plurality of communication cables (not shown) accommodated in the first and second small-diameter sheath tubes 111 and 112 are colored in mutually different colors, and the first and second small-diameter sheath tubes 111, A communication cable (not shown) or the like housed inside 112 is seen through the port member 91 and the port member 92.

  Therefore, in the present embodiment, the communication cables of the respective colors accommodated in the first and second small diameter sheath tubes 111 and 112 are seen through the port member 91 and the port member 92, so that the first And the visibility of the communication cables and the like inside the second small-diameter sheath pipes 111 and 112 are ensured, the type of the communication cables can be easily confirmed, and the outlet 91 of the first small-diameter sheath pipe 111 and the second small-diameter sheath pipe Incorrect connection with the receiving member 92 of 112 can be reliably prevented.

  In this embodiment, the outlet member 91 and the receiving member 92 are formed of a transparent hard vinyl chloride resin. However, as shown in FIG. 33, the distal end side portion 932 on the left side (left side in FIG. 33) and the proximal end side portion 931 on the other axial direction side (right side in FIG. 33), and the proximal end side portion 941 on the one axial side side and the axial line The receiving member 94 composed of the tip side portion 942 on the other side in the direction may be formed, and the first and second small diameter sheath tubes 113 and 114 may be formed of a transparent hard vinyl chloride resin. Even in this case, the visibility of the communication cables and the like inside the first and second small-diameter sheath tubes 113 and 114 is ensured, and the type of the communication cables can be easily confirmed. 93 and the receiving member 94 of the second small-diameter sheath tube 114 can be reliably prevented from being erroneously connected. Moreover, since the outlet member 93 and the receiving member 94 are formed of a colored hard vinyl chloride resin containing a pigment, the coloring member 93 and the receiving member 94 do not lose color due to surface rubbing, etc. This is very advantageous in reliably preventing erroneous connection between the outlet member 93 of the first small diameter sheath tube 113 and the receiving member 94 of the second small diameter sheath tube 114.

  Also, as shown in FIG. 34, a plurality of types of first and second small-diameter sheath tubes 111 and 112 (only one type is shown in FIG. 34) are all molded from the same color of hard vinyl chloride resin and joined in pairs. Even if the outlet member 95 and the receiving member 96 to be formed are formed of a colored hard polyvinyl chloride resin containing a pigment of a color different from that of the other outlet member and the receiving member joined in pairs. Good. In this case, the connecting member 95 and the receiving member 96 that are joined in pairs are precisely connected by color matching, and the connecting member 95 and the second small diameter sheath of the first small diameter sheath tube 111 are connected. It is possible to reliably prevent erroneous connection of the tube 112 with the receiving member 96.

  Further, as shown in FIG. 35, a plurality of types of first and second small-diameter sheath tubes 111 and 112 are all formed of hard vinyl chloride resin of the same color and joined to each other in pairs. The member 96 is formed of a colored hard polyvinyl chloride resin containing a pigment of a color different from that of the other opening member and the receiving member that are joined in pairs, and the first and second small-diameter sheath tubes 111, The color lines 111a and 112a of the same color as that of the opening member 95 and the receiving member 96 may also be drawn in the axial direction. In this case, the color matching of the opening member 95 and the receiving member 96 that are joined in pairs is performed more smoothly by the color lines 111a and 112a, so that the connecting member 95 and the receiving member 96 are accurately positioned. By being connected, it becomes possible to more reliably prevent erroneous connection between the outlet member 95 of the first small-diameter sheath tube 111 and the receiving member 96 of the second small-diameter sheath tube 112.

  Further, as shown in FIG. 36, a plurality of types of first and second small-diameter sheath tubes 111 and 112 are all formed of hard vinyl chloride resin of the same color and joined to each other in pairs. The member 22 may have marks 218 and 228 of different colors from the opening member and the receiving member joined in pairs. In this case, the connecting member 21 and the receiving member 22 that are joined in pairs are simply connected by simply aligning the marks 218 and 228 for each color, and the connecting member of the first small-diameter sheath tube 111 is connected. It is possible to reliably prevent the erroneous connection between 21 and the receiving member 22 of the second small-diameter sheath tube 112.

  Further, as shown in FIGS. 37 to 39, the plurality of types of first and second small-diameter sheath tubes 111 and 112 are all formed of hard vinyl chloride resin of the same color, and the first and second small-diameter sheath tubes 111 and 112 are formed. What are the other opening members and receiving members that are joined to the opening member 21 and the receiving member 22 that are fixed to the rotating device 97 and rotate when they are fused together by spin welding? Different color circumferential lines 219 and 229 may be marked by the marker M. In this case, the opening member 21 and the receiving member 22 that are joined in pairs are simply connected by simply aligning the lines 219 and 229 for each color, and the opening member of the first small-diameter sheath tube 111 is connected. It is possible to reliably prevent the erroneous connection between 21 and the receiving member 22 of the second small-diameter sheath tube 112. In addition, lines 219 and 229 for each color can be simply written on the outlet member 21 and the receiving member 22 when the first and second small-diameter sheath tubes 111 and 112 are fused by spin welding.

Note that the present invention is not limited to the above-described embodiments, and various other modifications are provided in the present application. For example, in the first embodiment, when the first vertical surface 215 of the first engagement piece 214 is engaged with the vertical surface 220 of each second engagement piece 224, the other end in the axial direction of the projecting piece 225. However, as shown in FIGS. 40 and 41, the protruding piece 225 and the second notch groove of the notch portion 23 on the inner peripheral surface of the receiving member 22 are restricted. An annular recess 71 having a substantially semicircular cross section is provided between the first engagement piece 214 and the second engagement piece 214 so that the first vertical surface 215 of the first engagement piece 214 is inserted into the second engagement piece. When the front end of the first engagement piece 214 (the left end in FIG. 40) is in pressure contact with the exposed portion 721 of the rubber ring 72 when engaged with the vertical surface 220 of 224, further insertion of the differential member 21 is performed. The movement in the direction may be restricted. In this case, the front end of the first engagement piece 214 and the gap between the protrusion 225 on the inner peripheral surface of the receiving member 22 and the second notch groove 232 of the notch 23 are sealed by the rubber ring 72 and joined. It becomes possible to ensure the watertightness of the component 2.
And in the said 2nd Embodiment, when the 1st vertical surface 315 of the 1st engagement piece 314 engages with the vertical surface 320 of the 2nd engagement piece 324, it is a gap member by the inclined surface 325a of the protrusion 325. Although the movement in the further insertion direction of 31 was restricted, as shown in FIGS. 42 and 43, the other end in the axial direction of each notch groove 331 of the notch 33 in the outer peripheral surface of the outlet member 21 and the second end An annular recess 73 having a substantially semicircular cross section is provided between the first engagement piece 314 and the first engagement surface 315 in the second engagement. When the inner peripheral surface of the second engagement piece 324 is pressed against the exposed portion 741 of the rubber ring 74 when engaged with the vertical surface 320 of the piece 324, the insertion member 31 is further inserted in the insertion direction. The movement may be restricted.
44 and 45, an annular recess 75 having a substantially semicircular cross section is provided at the other axial end of the inner peripheral surface of the second engagement piece 324, and a rubber ring 74 is provided in the annular recess 75. When the first vertical surface 315 of the first engagement piece 314 is engaged with the vertical surface 320 of the second engagement piece 324 by being fitted, each notch groove of the notch 33 on the outer peripheral surface of the opening member 21 is inserted. Further movement of the differential member 31 in the insertion direction is restricted in a sealed state where the other end in the axial direction of 331 and the second vertical surface 316 are pressed against the exposed portion 741 of the rubber ring 74. May be. In this case, the rubber ring 74 seals between the inner peripheral surface of the second engagement piece 324 and each notch groove 331 and the second vertical surface 316 of the notch 33 in the outer peripheral surface of the differential member 21. It becomes possible to ensure the watertightness of the joining component 3.

  In each of the above embodiments, the first engaging pieces 314, 514, 614 that can be elastically deformed radially inward or the second engaging pieces 224, 424, 824, 854 that can be elastically deformed radially outward. , 924 are provided at four positions at predetermined intervals in the circumferential direction, but the first engagement pieces that can be elastically deformed radially inward or the second engagement pieces that can be elastically deformed radially outwardly have predetermined intervals in the circumferential direction. Needless to say, it may be provided at every other 1 to 3 or 5 or more locations.

  Moreover, in each said embodiment, the port member 21, 31, 41, 51, 61, 81, 91 is made into the one end part of the 1st small diameter sheath tube 111, and the port member 22, 32, 42, 52, 62, 82, 85, and 92 are fused and integrally joined to the other end of the second small-diameter sheath tube 112 by relative rotation around the axis by the spin weld, respectively. When the receiving member is bonded to the other side end of the second small-diameter sheath tube with an adhesive, and the first and second small-diameter sheath tubes are injection molded to one side end The opening portion may be formed integrally with one end portion of the first small diameter sheath tube, and the receiving portion may be formed integrally with the other end portion of the second small diameter sheath tube.

  Further, in each of the embodiments, the first vertical surfaces 215, 315, 415, 515, 615, 815 of the first engaging pieces 214, 314, 414, 514, 614, 814 and the second engaging pieces 224, The height of engagement of the vertical surfaces 220, 320, 420, 520, 620, 820, and 850 of 324, 424, 524, 624, 824, and 854 (the overlapping margin in the radial direction) was set to 1.2 mm. However, this is an engagement height set to require a pulling force of 3300 N to the last, and a sufficient joining force can be obtained if there is actually an engagement height of 1 mm or more. Also, the height of engagement between the first vertical surface of the first engagement piece and the vertical surface of the second engagement piece is changed depending on the size and thickness of the sheath tube in order to obtain a sufficient joining force. Needless to say.

111 1st small diameter sheath tube (1st sheath tube)
112 2nd small diameter sheath tube (2nd sheath tube)
2 Joining parts 21 Slot member (slot part)
214 First engaging piece 22 Receiving member (receiving portion)
224 Second engagement piece 225a Vertical surface (stopper)
23 Notch part 3 Joining part 31 Insert member (open part)
314 First engagement piece 32 receiving member (receiving portion)
324 Second engagement piece 325a Slope (stopper)
33 Notch part 4 Joining part 41 Insert member (open part)
414 First engagement piece 42 Receiving member (receiving portion)
424 Second engagement piece 425a Vertical surface (stopper)
43 Notch part 5 Joining part 51 Insert member (attachment part)
514 First Engagement Piece 52 Receiving Member (Receiving Portion)
524 Second engagement piece 525a Vertical surface (stopper)
53 Notch part 6 Joining part 61 Insert member (open part)
614 First engaging piece 62 Receiving member (receiving portion)
624 Second engagement piece 625a Vertical surface (stopper)
63 Notch 8 Joining part 81 Insert member (open part)
814 First engaging piece 82 Receiving member (receiving portion)
824 2nd engagement piece 83 Diameter expansion part 831 Tapered surface 84 Diameter expansion part 85 Receiving member (receiving part)
854 Second engagement piece 827 Through hole 9 Joining component 91 Insert member (attachment portion)
92 Receiving member (receiving portion)
K slide core

Claims (12)

An outlet portion made of a synthetic resin and provided at an end portion on one side in the axial direction of the first sheath tube, and a receiving portion made of a synthetic resin and provided at an end portion on the other side in the axial direction of the second sheath tube And a connecting structure of a sheath tube that is inserted into the receiving port portion to join the receiving port portion and the receiving port portion,
A first engagement piece projecting radially outward is provided on the outer peripheral surface of the opening portion, while a second engagement projecting radially inward is formed on the inner peripheral surface of the receiving portion. A coupling piece is provided, and the first engagement piece gets over the second engagement piece and engages with the second engagement piece when the insertion port portion is inserted into the receiving port portion. And
A cutout portion that allows elastic deformation in the inner / outer diameter direction of the first or second engagement piece provided on one of the difference port portion and the receiving portion is provided. The joint structure of the sheath tube.   The outer peripheral surface of the said 1st engaging piece is a junction structure of the sheath pipe of Claim 1 currently formed in the taper surface which becomes a small diameter to the one axial direction side of the said opening part.   The sheath tube joining structure according to claim 1 or 2, wherein an inner peripheral surface of the second engagement piece is formed as a tapered surface having a small diameter toward one side in the axial direction of the receiving portion.   The said 1st engagement piece is a junction structure of the sheath pipe of any one of Claims 1-3 provided in the edge part of the axial direction one side of the said opening part.   The said opening part is joined to the edge part of the axial direction one side of the said 1st sheath tube, and the said receiving part part is joined to the edge part of the axial direction other side of the said 2nd sheath pipe by spin weld, respectively. The junction structure of the sheath pipe according to any one of claims 1 to 4.   The stopper part is provided with a stopper for restricting further insertion of the opening part with respect to the receiving part when the first engaging piece is engaged with the second engaging piece. The junction structure of the sheath tube of any one of Claims 1-5.   The sheath tube connection structure according to any one of claims 1 to 6, wherein a rib extending in an axial direction of the receiving portion is provided on an outer peripheral surface of the second engagement piece.   When the end portion on the other side in the axial direction of the outer peripheral surface of the opening portion is inserted into the inner peripheral surface of the receiving portion, the opening portion is inserted when the opening portion is inserted into the receiving portion and joined. The connection structure of the sheath tube as described in any one of Claims 1-7 in which the enlarged diameter part which inserts the inner peripheral surface of a part to the outer peripheral surface of the said opening part to a radial direction without gap is provided. .   The sheath tube according to claim 8, wherein a tapered surface is provided on one side in the axial direction of the enlarged diameter portion so as to reduce the diameter of the enlarged diameter portion toward the one side in the axial direction on the outer peripheral surface of the opening portion. Connection structure.   At least one of the first sheath tube and the second sheath tube receiving portion joined to each other, and the first sheath tube corresponding to the difference port portion and the second sheath tube corresponding to the receiving portion. One side is the connection structure of the sheath pipes as described in any one of Claims 1-9 currently shape | molded by the transparent synthetic resin which can see through the inside.   The receiving portion is formed by injection molding, and an end portion on one side in the axial direction of the second engagement piece is provided with a through-hole penetrating radially outward of the receiving portion along the end surface. The connecting structure for a sheath tube according to any one of claims 1 to 10. Can be joined to the end member on the other axial side of the second sheath tube on the same axis as the first sheath tube, and the differential member made of synthetic resin that can be joined to the end portion on the one axial direction of the first sheath tube A receiving member made of a synthetic resin, and a joining component in which the opening member is inserted into the receiving member and the opening member and the receiving member are joined.
A first engagement piece projecting radially outward is provided on the outer peripheral surface of the opening member, while a second engagement projecting radially inward is formed on the inner peripheral surface of the receiving member. A coupling piece is provided, and the first engagement piece gets over the second engagement piece and engages with the second engagement piece when the insertion member is inserted into the receiving member. And
One of the opening member and the receiving member is provided with a notch that allows elastic deformation of the first or second engagement piece provided in one of the opening member and the second engaging piece in the inner / outer diameter direction. Joined parts.

Images