JP2019126254A - Conduit pipe, connection structure of conduit pipe, bell block, method of connecting conduit pipe with each other, method of connecting conduit pipe with bell block, pipe joint and ring member - Google Patents

Abstract

To provide a conduit pipe or the like which is excellent in assembling operability and is easily connected.SOLUTION: An area sandwiched by a pair of restraint walls 9 gets to a ring member arrangement part 11. The ring member arrangement part 11 is constituted with a large diameter part 13, a slope part 15, and a small diameter part 17 in the order from the tip side of a pipe body 3. A ring member 5 is arranged on the ring member arrangement part 11. The ring member 5 assumes such an approximate C-shape form that a part of circular direction is cut by a cut part 19. A length in a pipe axial direction besides a tapered part 25 of the ring member 5 is equal to a length of the small diameter part 17 of the ring member arrangement part 11 or is shorter than the length of the small diameter part 17 of the ring member arrangement part 11. That is, a length in the pipe axial direction of the ring member 5 is shorter than a length in the pipe axial direction of the ring member arrangement part 11. Therefore, the ring member 5 is slidable in the pipe axis direction in the ring member arrangement part 11.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a conduit for protecting an electric wire, a connection structure of conduits, a bell block, a method of connecting conduits, a method of connecting a conduit and a bell block, a tube joint, and a ring member.

  Conventionally, for example, a conduit is buried in the ground and used. In this case, a plurality of electrical conduits are juxtaposed and buried. Further, since each of the conduits is manufactured and transported with a predetermined length, a plurality of conduits are connected at a connection portion by a pipe joint, a fitting structure, or the like.

  As such a connection structure of a conduit, for example, a pipe joint having a helical tube has been proposed (Patent Document 1).

  In Patent Document 1, the connection is performed by rotating and screwing the end (male structure) of the outer surface spiral electric wire tube to the inner surface spiral shape (female structure) of the pipe joint. Furthermore, a water expansion member is provided on the outer periphery of the male joint and the inner peripheral surface of the female joint to stop water.

  Further, there has been proposed a retaining ring which can be compactly and easily join together corrugated flexible tubes, and does not easily fall off from the pipe joint even in the case of an impact or the like (Patent Document 2).

  In Patent Document 2, a retaining ring is disposed in a female fitting portion used for connection of a conduit as a protective tube such as a cable. The male fitting portion inserted into the female fitting portion can be prevented from coming off from the female fitting portion by the retaining ring. At this time, by making the shape of the retaining ring proper, the mounting of the retaining ring is easy.

  More specifically, the retaining ring of the invention of Patent Document 2 is provided on a ring-shaped main body, a plurality of claws bent inward in the radial direction of the main body, and the outer peripheral surface of the main body, And a plurality of stoppers protruding to the outer peripheral side of

  Here, the stoppers of the retaining ring include a first pair of stoppers and a second pair of stoppers, and the first pair of stoppers are provided at opposing positions of the main body, and the second pair of stoppers are provided. The stoppers are provided at opposite positions of the main body. Further, among the stoppers, an inclined portion which is inclined in the tube axis direction of the main body portion is provided on the outer surface of at least the second pair of stoppers. The inclination angles of the inclined portions provided on the second pair of stoppers are formed so as to be opposite to each other with respect to the tube axis direction of the main body portion.

  According to the invention of Patent Document 2, when attaching the retaining ring to the female pipe joint of the conduit, the retaining ring falls down inside the pipe, and it takes time to attach to the inner wall of the conduit itself, etc. At the same time as solving the problem, it is possible to prevent the C-shaped retaining ring from being temporarily reduced in diameter due to an impact at the time of unloading from a truck or the like, thereby preventing the retaining ring from falling out of the pipe joint.

  In addition to this, a socket and a slot are formed at both ends in the tube axial direction, and a ring is attached to a rubber ring and a first predetermined position on the back side of the rubber ring, and the slot is inserted into the socket. A possible corrugated synthetic resin tube has been proposed (US Pat. No. 5,677,015).

  In Patent Document 3, a groove for receiving the ring and cooperating with the ring to prevent removal is formed at a second predetermined position of the socket on the tip end side of the rubber ring. Patent Document 3 relates to a corrugated synthetic resin pipe and a connection structure using the corrugated synthetic resin pipe. Further, in the invention of Patent Document 3, a ring mounted on a corrugated synthetic resin pipe in which peak portions and valley portions are alternately formed on the outer peripheral surface is two ring members in which a part in the circumferential direction is cut. Are formed to be superimposed in the tube axis direction. When the outlet is inserted into the socket, both of the two ring members are contracted. On the other hand, since the corrugated synthetic resin tube abuts on one of the ring members when pulling out the difference port, even if the diameter of one of the ring members is reduced, the other ring member remains open. For this reason, withdrawal of the corrugated synthetic resin tube is restricted.

  Moreover, it is proposed that the block body for protecting the conduit used for a handhole is provided with the retaining structure of a conduit (patent document 4).

  In Patent Document 4, the block body has a substantially cubic or substantially rectangular parallelepiped outer shape, and a through hole is formed. In the through holes, a substantially circular cross-sectional shape is continuous in a concavo-convex shape in the tube axis direction from the surface side to the back side of the block. A retaining member having a locking piece is attached to the recess of the through hole.

Unexamined-Japanese-Patent No. 2007-64267 JP, 2009-275790, A JP, 2002-98268, A JP, 2011-234520, A

  However, patent document 1 is used for connection of a spiral-shaped waved pipe, and there is a restriction in the shape of an applicable pipe body. Moreover, since it is necessary to screw in a pipe joint at the time of connection, it takes time for connection work. Further, since the outer diameter of the pipe joint becomes larger than the outer diameter of the pipe body, for example, when a plurality of conduits are stacked and arranged in the ground, the joint portion becomes unstable.

  Moreover, although patent document 2 is related with the retaining ring inserted in the inside of a female fitting structure, when assembling, the workability which inserts a retaining ring in the inside of a female fitting part is bad. In addition, since it is not possible to visually recognize the state after assembly, it may not be noticed that the retaining ring is not attached or dropped out during transportation.

  Moreover, patent document 3 has a rubber ring in the position near the insertion port side of a male part, and also has a retaining ring in the back side of a male part. Although the diameter expansion ring is dropped into the groove of the waved portion periodically provided in the male portion, in Patent Document 3, the rubber ring is provided at a position close to the insertion port side of the male portion. For this reason, when inserting the male joint part deeply into the female joint part and fitting it with the retaining ring, the insertion resistance of the rubber ring part becomes large, so in some cases, a lubricant is added to the rubber ring part. Need to be applied

  Further, in Patent Document 4, since a part of the locking piece is embedded in the block main body, the manufacturability is poor and, similarly to Patent Document 2, the locking piece can not be viewed from the outside.

  The present invention has been made in view of such problems, and is excellent in assembling workability and easy to connect, a conduit, a connection structure of conduits, a bell block, a method of connecting conduits, a conduit and a bell An object of the present invention is to provide a method of connecting blocks, a pipe joint, and a ring member used for these.

  In order to achieve the above-mentioned object, the first invention is a conduit having a male fitting portion formed on an outer peripheral portion in the vicinity of an end portion of the tubular body, and a pair of the conduits being spaced apart in the axial direction And a ring member disposed in a region between the lock walls, wherein the ring member has a substantially C shape with a part thereof cut in the circumferential direction. In a cross section in the tube axis direction of the ring member, the ring member has a flat inner surface, has claws on the outer surface, and tapers toward one end of the ring member on both the outer surface and the inner surface. The ring member is disposed such that the tapered side by the tapered portion is located on the tip end side of the tube, and the locking wall is the tube in a region sandwiched by the locking wall A large diameter portion is formed on the tip end side of the tube, and a small diameter portion is formed on the base side of the tube in the region sandwiched by the locking walls. A portion is formed, a sloped portion is formed between the large diameter portion and the small diameter portion, and a length in a tube axial direction of the ring member excluding the tapered portion is equal to a length of the small diameter portion, Shorter than the length of the small diameter portion, the ring member has a clearance between it and at least one of the locking walls, and the ring member can slide to either the large diameter portion or the small diameter portion It is a conduit characterized by being.

  In the first aspect of the invention, the conduit may be provided with a water blocking member on the base side of the locking wall on the base side of the male fitting portion.

  In the region sandwiched by the locking wall, the diameter reducing rib having a diameter larger than the outer diameter of the large diameter portion is continuous with the small diameter portion from the large diameter portion with the beveled portion interposed therebetween. The diameter reducing rib may have a male fitting portion in which the cut portion of the ring member is fitted.

  In the first invention, as will be described later, the opening side of the tubular body is the tip side of the tubular body, and the back side in the longitudinal direction of the tubular body which is the opposite side is defined as the proximal side of the tubular body.

  According to the first aspect of the invention, the ring member can be easily visually recognized by arranging the ring member on the outer surface of the male fitting portion.

  Further, since the ring member is movable to the large diameter portion and the small diameter portion formed on the outer surface of the male fitting portion, the diameter reduction of the ring member is restricted when the ring member is positioned at the large diameter portion. When positioned at the small diameter portion, the diameter of the ring member can be reduced. For this reason, when fitting with the female fitting portion, the ring member moves to the small diameter portion, and the diameter can be easily reduced. Further, after being connected to the female fitting portion, even if the male fitting portion is pulled out, the ring member is positioned at the large diameter portion, so the diameter reduction is regulated and the fitting with the female fitting portion is performed. It is possible to suppress the disconnection.

  Thus, according to the first aspect of the present invention, the male fitting portion is locked by the ring fitting portion formed in the female fitting portion, and the claw portion of the ring member exceeds the ring fitting portion. It takes a moment to lock. In addition, since the claws themselves of the ring member are not elastically deformed and exceed the ring fitting portion of the female fitting portion, the ring member has a cut portion, and therefore, the diameter of the entire ring member is reduced. Therefore, the diameter can be easily reduced even if the thickness of the claws to which the drawing force is applied is increased.

  A second invention is a conduit having a fitting structure at both ends, which is a tube, a male fitting portion formed at one end of the tube, and the other end of the tube. And a female fitting portion having a shape capable of being fitted to the male fitting portion, the male fitting portion is formed on an outer peripheral portion of the tube, and the tube axial direction is formed. And a ring member arranged in a region between the lock walls, the ring member being partially cut in the circumferential direction The ring member is substantially C-shaped, and in a cross section of the ring member in the tube axis direction, the ring member is flat on the inner surface and has claws on the outer surface, and one end of the ring member on both the outer and inner surfaces And the ring member has a tapered portion such that the tapered side by the tapered portion is positioned on the distal end side of the pipe body. A large diameter portion is formed on the tip end side of the pipe body in the area sandwiched by the locking wall, and the locking wall is formed at the base of the tube in the area sandwiched by the locking wall A small diameter portion is formed on the side, and an inclined surface portion is formed between the large diameter portion and the small diameter portion, and the length of the ring member in the tube axial direction is shorter than the length of the small diameter portion. The member has a clearance with at least one of the locking walls, the ring member is slidable to any position of the large diameter portion or the small diameter portion, and the female fitting portion is A ring fitting portion formed on the inner peripheral portion of the tubular body, from the tip end side, a cylindrical portion, a slope portion gradually reducing the diameter from the cylindrical portion, and a ring fitting portion expanding from the minimum inner diameter portion of the slope portion And an electrical conduit characterized by comprising.

  In the region sandwiched by the locking wall, the large diameter portion continues from the large diameter portion to the small diameter portion across the inclined surface portion, and the diameter reduction rib having a diameter larger than the outer diameter of the large diameter portion is the large diameter The width of the diameter-reducing rib in the small diameter portion may be narrower than the width of the diameter-reducing rib in the portion, and the cut portion of the ring member may fit into the diameter-reducing rib.

  A water blocking member may be provided on the base side of the locking wall on the base side of the male fitting portion.

  Between the male fitting portion and the female fitting portion, a helical waveform having a predetermined pitch may be formed continuous with the outer peripheral surface of the tube.

  Between the male fitting portion and the female fitting portion, a large diameter portion as a substantially square peak portion and a small diameter portion as a circular valley portion are alternately formed on the outer peripheral surface of the tube. May be

  A pair of protrusions are formed at a substantially central portion of the small diameter portion as the valley with respect to the tube axis direction of the tube, and a flat portion is formed between the protrusions in the tube axial cross section of the tube. May be

  The small diameter portion as the valley portion may be formed in a corrugated shape in a cross section in the tube axial direction of the tube body.

  The water blocking member may be disposed in a water blocking member accommodating portion formed on the base side further than the locking wall on the base side of the male fitting portion.

  The ring member may be any of ABS resin, PP resin, hard vinyl chloride, or a mixed resin or polymer alloy of any of these and PC resin.

  The water blocking member may be either a rubber or a water expansion member.

  According to the second invention, the same effect as that of the first invention can be obtained. Further, since the female fitting portion is provided at the other end, it is easy to connect a plurality of conduits.

  Further, by providing the diameter-restricting rib in the region sandwiched by the locking wall, when the ring member is positioned at the large diameter portion, contact between the end surface of the ring member at the cut portion and the diameter-restricting rib The diameter reduction is limited. On the other hand, when the ring member is positioned at the small diameter portion, a sufficient clearance is formed between the end surface of the ring member in the cut portion and the diameter reduction limiting rib, so the diameter reduction of the ring member is allowed.

  Moreover, the electric wire tube concerning 2nd invention can also form a helical wave shape in the outer peripheral surface of a pipe body. That is, a male fitting portion and a female fitting portion can be provided to a conventional helical wave tube.

  In the electric wire tube according to the second aspect of the present invention, a substantially square peak portion and a circular valley portion may be alternately formed on the outer peripheral surface of the tube. That is, the conduit may be a square conduit. By so doing, when stacking a plurality of conduits, conduits can be stacked stably.

  Under the present circumstances, if a pair of projection part is formed in the approximate center part of the valley part to the tube axial direction of a tube body, and a groove shape is formed between the projection parts, electric conduit will be cut easily at the concerned site. be able to. For this reason, length adjustment is easy.

  The valleys between the substantially square peaks and the peaks may be used as the waveform. By doing this, the flexibility can be further enhanced.

  In addition, by appropriately selecting the material of the ring member, it is possible to achieve both an appropriate elastic force and a strength that can withstand the extraction force.

  In addition, as the water blocking member, either a rubber or a water expansion member can be selected.

  A third aspect of the invention is a connection structure of a conduit according to the second aspect, using a plurality of the conduits, the male fitting portion of one of the conduits, and the other of the conduits. A female fitting portion is fitted and connected, and the maximum thickness of the ring member is the diameter of the small diameter portion of the male fitting portion and the minimum inner diameter portion of the slope portion of the female fitting portion. It is a connecting structure of electrical conduits characterized in that the directional clearance and the radial clearance between the large diameter portion of the male fitting portion and the ring fitting portion of the female fitting portion are also smaller.

  A third aspect of the present invention is the connection structure for a conduit according to the second aspect, wherein the handhole having a bell block and the bell having the same structure as the female fitting portion using the conduit. It is a connection structure of a conduit, wherein the block and the male fitting portion of the conduit are connected.

  The handhole may include a plurality of the bell blocks, and the conduit may be connected to part or all of the bell blocks.

  According to the third aspect of the present invention, it is possible to obtain a connection structure between conduits or a conduit and a bell block, which can be easily connected.

  A fourth invention is a bell block connectable to the conduit according to the second invention, and having the same structure as the female fitting portion.

  According to the fourth invention, it is possible to obtain a bell block which can be easily connected to a conduit.

  A fifth invention is a method of connecting electric conduits according to the second invention, wherein the step of inserting the end of the male fitting portion into the female fitting portion; The tapered portion of the outer periphery of the ring member disposed in the region sandwiched by the locking wall is brought into contact with the sloped portion to slide the ring member to the small diameter portion of the male fitting portion And the step of storing the ring member in the small diameter portion of the male fitting portion, and the end portion of the claw portion passing through the inclined surface portion of the female fitting portion; The electrical conduits are accommodated in the ring fitting portion formed on the base side of the inclined surface of the female fitting portion.

  A fifth invention is a method of connecting a conduit and a bell block according to the second invention, wherein the bell block has the same structure as the female fitting portion of the conduit. Inserting the tip end of the male fitting portion into the bell block, the tapered portion of the outer periphery of the ring member disposed in the region sandwiched by the locking wall in the slope portion of the bell block Contacting and sliding the ring member to the small diameter portion of the male fitting portion to reduce the diameter, and storing the ring member in the small diameter portion of the male fitting portion; and the claw portion An electric wire characterized in that the claw portion is accommodated in the ring fitting portion formed on the base side of the slope portion of the bell block by passing through the slope portion of the bell block. It is a connection method of a pipe and a bell block.

  According to the fifth invention, the conduits or the conduits and the bell block can be easily connected.

  A sixth invention is a pipe joint connectable to the conduit according to the second invention, wherein at least one end has the same structure as that of the male fitting portion.

  In this case, both ends may have the same structure as the male fitting portion. Further, one end may have the same structure as the male fitting portion, and the other end may be a bellmouth.

  A sixth aspect of the invention is a pipe joint characterized in that it is connectable to the conduit according to the second aspect of the invention, and at least one end has the same structure as that of the female fitting portion.

  In this case, one end may have the same structure as the female fitting portion, and the other end may be a bellmouth. Also, one end may have the same structure as the female fitting portion, and the other end may have a spiral wave shape continuous with the outer surface of the tube.

  According to the sixth invention, it is possible to obtain a pipe joint which can be connected to the male fitting portion or the female fitting portion of the electric conduit.

  A seventh invention is a ring member used for a connection portion of a conduit, wherein the ring member has a substantially C shape in which a part in a circumferential direction is cut, and the ring member in a tube axial direction of the ring member In a cross section, the ring member is characterized in that the inner surface is flat, the outer surface has a claw portion, and both the outer surface and the inner surface have a tapered portion that tapers toward one end of the ring member. .

  According to the seventh aspect of the present invention, when used in the male fitting portion, the male fitting portion can be easily fitted with the female fitting portion and can be easily connected.

  According to the present invention, a conduit, a connection structure of conduits, a bell block, a method of connecting conduits, a method of connecting conduits and a bell block, a pipe joint, and these are excellent in assembling workability and easy to connect. The ring member used in the present invention can be provided.

The disassembled perspective view of the male fitting part 1a. The assembly perspective view of the male fitting part 1a. Sectional drawing of the male fitting part 1a. The partial expanded sectional view of the ring member 5. FIG. The figure which shows the connection method of the male fitting part 1a and the female fitting part 30a. (A), (b) is a figure which shows the connection method of the male fitting part 1a and the female fitting part 30a. (A), (b) is the H section enlarged view of FIG.6 (b), Comprising: The figure which shows the connection method of the male fitting part 1a and the female fitting part 30a. (A) is a figure which shows the connection method of the male fitting part 1a and the female fitting part 30a, (b) is a figure which shows the connection structure 10 of the male fitting part 1a and the female fitting part 30a . 5A is a view showing a state in which the ring member 5 is located in the large diameter portion 13, and FIG. 5B is a view showing a state in which the ring member 5 is located in the small diameter portion 17. The figure which shows the conduit 40a. (A) is a figure which shows the conduit 40b, (b) is an expanded sectional view of N part of (a). (A) is the LL sectional view taken on the line of Fig.10 (a), (b) is the MM sectional view taken on the line of Fig.10 (a). The figure which shows the conduit 40b. FIG. FIG. The figure which shows the connection structure 10a of the handhole 55 and the electric conduit 40a. The figure which shows bell block 50a. (A) is a figure which shows the pipe joint 60a, (b) is a figure which shows the pipe joint 60b. (A) is a figure which shows the pipe fitting 60c, (b) is a figure which shows the pipe fitting 60d.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the male fitting portion 1a, and FIG. 2 is an assembled perspective view of the male fitting portion 1a. FIG. 3 is a cross-sectional view of the male fitting portion 1 a in the tube axis direction. The male fitting portion 1a mainly includes the tube 3, the ring member 5, the water blocking member 7, and the like. The male fitting portion 1 a is formed on the outer peripheral portion in the vicinity of the end portion of the tube 3.

  The pipe 3 is, for example, a flexible electric pipe, a pipe joint main body, a bell block or the like, and the details of the form will be described later, but the form is not limited as long as an electric wire etc. can be inserted inside. Moreover, although the material of the pipe body 3 is not limited, for example, it is preferably made of resin and preferably made of high density polyethylene.

  High-density polyethylene is a polyethylene belonging to a crystalline thermoplastic resin in which ethylene of repeating units has linear bonding with little branching, and is also called hard polyethylene because of its relatively hard nature. In the old JIS K 6748: 1995, high density polyethylene is defined as polyethylene having a density of 0.942 or more. Copolymers of high density polyethylene are usually crystalline resins with 1 to 5 branches per 1000 ethylene monomers. The crystallinity of the homopolymer having a specific gravity of 0.97 exceeds 75%, the rigidity is high, the tensile strength, the impact strength, the cold resistance are excellent, and the mechanical properties do not decrease until the low temperature of -80 ° C. In addition, since there is little polarization in the molecule, it has poor adhesion and printability, but it has excellent insulating properties.

  The locking wall 9, the ring member placement portion 11, the locking wall 9, and the water blocking member housing portion 27 are formed at the end of the tube 3 sequentially from the tip. In the following description, the opening side (the direction of arrow B in the figure) of the tube 3 is defined as the tip side of the tube 3 and the opposite side (the direction of the arrow A in the figure) is the base side of the tube 3 Specify. The locking wall 9 is a portion where the outer diameter is larger than the surrounding. The pair of locking walls 9 are disposed apart from each other in the tube axis direction, and restrict the operating range of the ring member 5 described later.

  The region sandwiched by the pair of locking walls 9 is the ring member placement portion 11. The ring member placement portion 11 is composed of a large diameter portion 13, a slope portion 15 and a small diameter portion 17 in order from the tip end side of the tube 3. That is, the large diameter portion 13 is formed on the tip end side of the tube 3 in the region sandwiched by the pair of locking walls 9, and on the base side of the tube 3 in the region sandwiched by the pair of locking walls 9 The small diameter portion 17 is formed, and the sloped portion 15 is formed between the large diameter portion 13 and the small diameter portion 17. The outer diameter of the large diameter portion 13 is smaller than the locking wall 9 and larger than the small diameter portion 17.

  A water blocking member accommodating portion 27 is provided on the base side of the ring member arranging portion 11. As shown in FIG. 3, the water blocking member housing portion 27 is a groove having a substantially rectangular cross section, and the water blocking member 7 is housed in the water blocking member housing portion 27. That is, the water blocking member 7 is provided further on the base side than the locking wall 9 on the base side of the male fitting portion 1 a. The water blocking member 7 is an annular member, the inner diameter of the water blocking member 7 is smaller than the outer diameter of the water blocking member housing portion 27, and the inner surface of the water blocking member 7 is the outer surface of the water blocking member housing portion 27. In close contact.

  The water blocking member 7 has a shape in which the inner peripheral portion of the cross-sectional shape is linear (approximately the same diameter in the tube axis direction), and the outer peripheral portion has a slope portion extending from one end to the other in the tube axial direction . In addition, as shown in FIG. 2, the largest outer diameter part of the water blocking member 7 is arrange | positioned toward the base side of the tube 3, and the outer diameter of the said part is the tube 3 in the male fitting part 1a. The water blocking member 7 protrudes radially outward, which is larger than the maximum outer diameter. The maximum outer diameter portion of the water blocking member 7 may be formed not on the most proximal side of the water blocking member but in the middle between the tip side and the most proximal side.

  The water blocking member 7 is made of, for example, a rubber or a water expansion member. When the water blocking member 7 is made of rubber, for example, ethylene propylene rubber (Ethylene Propylene Rubber) can be applied. Ethylene propylene rubber is a type of synthetic rubber obtained by copolymerization of ethylene and propylene. In order to enable vulcanization with sulfur compounds, ethylene propylene rubber is often used as an EPDM rubber copolymerized with a small amount of a diene monomer. Other than these, SBR, CR, NBR, ACM rubber, EPDM / PP dynamically cross-linked elastomer, etc. can also be used.

  When the water blocking member 7 is made of a water expansion member, for example, a non-woven fabric made of polyester fiber and sodium polyacrylate fiber can be used. In this case, when the proportion of polyester fiber and sodium polyacrylate is 100% by mass in total, the amount of sodium polyacrylate is from 30% to 70%, preferably from 50 to 70% by mass. .

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

  The ring member 5 is arranged in the ring member arrangement portion 11. FIG. 4 is a view showing details of the cross-sectional shape of the ring member 5. The ring member 5 has a substantially C shape in which a part in the circumferential direction is cut at the cutting portion 19. A flat portion 31 is provided on the inner surface of the ring member 5 in a cross section in the tube axis direction of the ring member 5. Further, on the outer surface of the ring member 5, claws 23 protruding in the radial direction are provided. The claw portion 23 is formed on one end side of the ring member 5. In addition, as for the nail | claw part 23, the return angle (X in the figure) with respect to the outer surface of the ring member 5 shall be 90 degrees or less. The folding angle of the claws 23 is desirably large within a range of 90 ° or less, and the tips of the claws 23 are not necessarily pointed in a tapered shape, and a pressure receiving surface of a predetermined size may be formed. The turning angle may be 90 ° and formed as it is at right angles to the outer surface of the flat portion.

  In addition, a tapered portion 21 is provided which decreases in diameter from the outer surface of the ring member 5 (the outer surface of the claw portion 23) toward one end (the right side in the drawing) of the ring member 5. In addition, a tapered portion 25 whose diameter is increased from the inner surface of the ring member 5 toward one end (right side in the drawing) of the ring member 5 is provided. That is, both the outer surface (the outer surface of the claw portion 23) and the inner surface of the ring member 5 have a tapered portion 21 (the outer surface) tapered toward one end (the right side in the figure) of the ring member The inner surface is provided respectively. That is, in the inner surface of the ring member 5, the portion excluding the tapered portion 25 is the flat portion 31.

  As shown in FIG. 2, the ring member 5 is disposed such that the side on which the above-described tapered portions 21 and 25 are formed is directed to the distal end side of the tube 3. That is, in the ring member 5, the tapered side by the tapered portions 21 and 25 is located on the tip end side of the tube 3, and the other end thereof, and the folding direction of the claws 23 faces the base side of the tube 3 Arranged as. Since the inner diameter of the ring member 5 is smaller than the outer diameter of the locking wall 9, the ring member 5 is held between the locking walls 9.

  For the ring member 5, for example, any of ABS resin, PP resin, hard vinyl chloride, or a mixed resin or polymer alloy of any of these and PC resin is applicable, and an ABS resin (acrylonitrile butadiene styrene copolymer) is applied It is desirable to do.

  ABS resin is a thermoplastic resin having a common temperature of 70 to 100 ° C., and is a resin excellent in the balance of mechanical properties such as rigidity, hardness, processability, impact resistance, and bending fatigue. By adjusting the compounding ratio of the raw materials, it is possible to balance the above-mentioned characteristics, and also excellent in printing characteristics, having good flowability, good moldability such as thin-walled products, and excellent in surface aesthetics. It is. The mechanical properties of the ABS resin are, for example, about 39 MPa in tensile strength and about 64 MPa in flexural modulus.

  For example, a graft method is known as a method for producing an ABS resin. In the emulsion graft method, acrylonitrile, latex, styrene, and a catalyst and an emulsifier are polymerized in a polymerization reactor, water and the like are removed by a centrifugal separator, and then pelletized by an extruder. In the bulk polymerization method, each is polymerized using a polymerization reaction tank, and the unpolymerized monomer is recovered and then pelletized in an extruder. In the polymer blending method, rubber and additives are added to an AS resin, compounded by a mixer, and then pelletized by an extruder. A method of producing an ABS resin with an extremely high butadiene ratio by a grafting method and compounding it with an AS resin is one of the methods.

  As shown in FIG. 3, the length in the axial direction of the ring member 5 excluding the tapered portion 25 (the length of the flat portion 31 which is C in the figure) is the length of the small diameter portion 17 of the ring member placement portion 11 It is equal to (E in the figure) or shorter than the length of the small diameter portion 17 of the ring member placement portion 11. Therefore, the ring member 5 has a clearance 29 between it and at least one of the locking walls 9 in the state of being disposed in the ring member disposition portion 11. For this reason, the ring member 5 is slidable in the tube axis direction at the ring member arrangement portion 11.

  In addition, when the ring member 5 moves to the base side of the tube 3, the entire ring member 5 excluding the tapered portion 25 is positioned at the small diameter portion 17. Therefore, when the ring member 5 moves to the distal end side of the tube 3, at least a part of the ring member 5 is positioned on the outer periphery of the large diameter portion 13, and when the ring member 5 moves to the base side of the tube 3 The ring member 5 is located at the small diameter portion. Thus, the ring member 5 can be changed into a state in which the inner surface can contact the large diameter portion 13 and a state in which the inner surface can contact the small diameter portion 17 depending on the position.

  Next, the connection method of the male fitting part 1a and the female fitting structure which can be fitted with this is demonstrated. FIG. 5 is a view showing a state in which the male fitting portion 1a and the female fitting portion 30a are disposed to face each other, and the male fitting portion 1a is inserted into the female fitting portion 30a. First, as shown in FIG. 5, the tip of the male fitting portion 1a is inserted into the female fitting portion 30a.

  The female fitting portion 30 a is formed on the inner peripheral portion of the tube 3. The female fitting portion 30a is expanded in diameter from the cylindrical portion 35, the slope portion 37 gradually reducing the diameter from the cylindrical portion 35, and the minimum inner diameter portion of the slope portion 37 in order from the tip end side (opening side) A ring fitting portion 39 is provided.

  As shown in FIG. 6A, when the male fitting portion 1a is pushed into the female fitting portion 30a from this state (arrow F in the figure), a ring member is formed on the slope portion 37 of the female fitting portion 30a. The taper part 21 of the outer periphery of the ring member 5 arrange | positioned at the arrangement | positioning part 11 contacts. Further, when the male fitting portion 1a is pushed into the female fitting portion 30a, the entire flat portion 31 of the ring member 5 is moved to the small diameter portion 17 of the male fitting portion 1a as shown in FIG. 6 (b). The slide can be moved (arrow G in the figure).

  Fig.7 (a) is an enlarged view of ring member 5 vicinity in this state, and is the H section enlarged view of FIG.6 (b). The ring member 5 can slide in the ring member placement portion 11 until the tip of the ring member 5 contacts the locking wall 9. Under the present circumstances, since the length except the taper part 25 of the ring member 5 is below the length of the small diameter part 17, the whole ring member 5 is located in the range of the small diameter part 17 and the slope part 15. At this time, a clearance is generated between the inner surface of the ring member 5 and the small diameter portion 17.

  As shown in FIG. 7B, when the male fitting portion 1a is pushed into the female fitting portion 30a from this state (arrow F in the figure), the claw portion 23 is formed by the slope portion 37 of the female fitting portion 30a. The entire ring member 5 can be reduced in diameter by the clearance between the inner surface of the ring member 5 and the small diameter portion 17 (arrow I in the figure). That is, the entire ring member 5 can be accommodated in the small diameter portion 17 of the male fitting portion 1a.

  As shown in FIG. 8 (a), when the male fitting portion 1a is further pushed into the female fitting portion 30a from this state (arrow F in the figure), the end of the claw portion 23 is the female fitting portion 30a. Go through the slope 37 of the At this time, the ring member 5 which has been elastically deformed is released from the pressure from the inclined surface portion 37, and is restored to the original diameter and expanded in diameter (arrow J in the drawing). Thereby, the claw portion 23 is accommodated in the ring fitting portion 39 formed on the base side of the slope portion 37 of the female fitting portion 30a.

  FIG. 8 (b) is a view showing the connection structure 10 in which the male fitting portion 1 a and the female fitting portion 30 a are connected, obtained in this manner. In this state, the tip of the claw portion 23 is fitted with the ring fitting portion 39 of the female fitting portion 30a. For this reason, even when trying to pull out the female fitting portion 30a (arrow K in the figure), the movement of the ring member 5 is restricted by the locking wall 9, and the male fitting portion 1a is released from the female fitting portion 30a. It will not be pulled out.

  In particular, the inner diameter of the ring member 5 at the normal time substantially coincides with the large diameter portion 13 of the male fitting portion 1a. Therefore, when the ring member 5 is at the position of the large diameter portion 13, sufficient clearance does not occur between the inner surface of the ring member 5 and the outer surface of the large diameter portion 13. For this reason, it is suppressed that the ring member 5 is diameter-reduced, and it can suppress that the fitting with the nail | claw part 23 and the ring fitting part 39 remove | deviates.

  As described above, when the ring member 5 is positioned at the large diameter portion 13, since the clearance between the inner surface of the ring member 5 and the outer surface of the large diameter portion 13 is small, the diameter reduction is restricted. By moving to 17, since the clearance between the inner surface of the ring member 5 and the outer surface of the small diameter portion 17 is large, the diameter can be reduced. However, in addition to this, the diameter reduction of the ring member 5 may be regulated by another structure.

  Fig.9 (a) is a figure which shows the state which formed the diameter reduction rib 33 in the male fitting part 1a. The diameter reducing rib 33 is formed in a region sandwiched by the locking wall 9 and is formed in a predetermined dimension in the axial direction of the pipe so as to continue from the large diameter portion 13 to the small diameter portion 17 with the slope portion 15 interposed therebetween. Ru. The outer surface of the diameter reducing rib 33 has a diameter larger than the outer diameter of the large diameter portion 13 and is, for example, a rib having a height equal to that of the locking wall 9.

  As the diameter reducing rib 33 goes from the large diameter portion 13 to the small diameter portion 17, the width (circumferential length) gradually decreases. That is, the width of the diameter reduction rib 33 in the small diameter portion 17 is narrower than the width of the diameter reduction rib 33 in the large diameter portion 13. The cutting portion 19 of the ring member 5 is positioned in the diameter reducing rib 33, and the diameter reducing rib 33 is fitted into the cutting portion 19. If the width of the diameter-reducing rib 33 in the small diameter portion 17 is narrower than the width of the diameter-reducing rib 33 in the large diameter portion 13, the width of the diameter-reducing rib 33 does not gradually change, but It is also good. For example, in the vicinity of the boundary between the large diameter portion 13 and the small diameter portion 17 (slope portion 15), the width of the diameter reduction rib 33 may be changed to be a step.

  As shown in FIG. 9A, when the ring member 5 is positioned at the large diameter portion 13, the width of the diameter reduction rib 33 is substantially equal to the width (circumferential length) of the cutting portion 19 . Therefore, even if the diameter of the ring member 5 is to be reduced, the circumferential end surface of the ring member 5 in the cutting portion 19 contacts the diameter reduction rib 33, and the reduction of the diameter is restricted.

  On the other hand, as shown in FIG. 9B, when the ring member 5 is positioned at the small diameter portion 17, the width of the diameter reduction rib 33 is sufficiently larger than the width (circumferential length) of the cutting portion 19. narrow. For this reason, a clearance is generated between the circumferential end surface of the ring member 5 in the cutting portion 19 and the diameter reducing rib 33. Therefore, the diameter of the ring member 5 can be reduced.

  Here, the maximum thickness (the height from the flat portion 31 to the tip of the claw portion 23) of the ring member 5 is the male fitting portion when the male fitting portion 1a is inserted into the female fitting portion 30a. Radial clearance between the small diameter portion 17 of 1a and the minimum inner diameter portion of the slope portion 37 of the female fitting portion (the outer diameter of the small diameter portion 17 of the male fitting portion 1a and the slope portion 37 of the female fitting portion Clearance smaller than the minimum inner diameter). Therefore, the diameter of the ring member 5 can be reduced at the position of the small diameter portion 17. At this time, when the minimum inner diameter portion of the slope portion 37 of the female fitting portion passes the ring member 5, the diameter of the ring member 5 is increased. Thus, the claw portion 23 can get over the slope portion 37 of the female fitting portion 30a.

  Further, the maximum thickness (the height from the flat portion 31 to the tip of the claw portion 23) of the ring member 5 is determined when the male fitting portion 1a is inserted into the female fitting portion 30a. Radial clearance of the enlarged diameter portion by the ring fitting portion 39 of the large diameter portion 13 of the female fitting portion 30a (the outer diameter of the large diameter portion 13 of the male fitting portion 1a and the expansion by the ring fitting portion 39 Clearance smaller than the inner diameter of the diameter portion). Therefore, the ring member 5 is restricted in diameter reduction at the position of the large diameter portion 13 and fitted with the ring fitting portion 39 of the female fitting portion 30a.

  As described above, the ring member 5 is restricted in diameter reduction at the position of the large diameter portion 13 depending on the position, and diameter reduction is possible at the position of the small diameter portion 17, thereby facilitating connection and preventing removal. can do.

  Note that the taper angle of the tapered portion 25 of the ring member 5 (in the axial direction of the male fitting portion 1a in the tube axial direction, so that the ring member 5 can move smoothly from the small diameter portion 17 to the large diameter portion 13) The angle formed by the extension line of the flat portion 31 and the taper portion 25 is the taper angle of the slope portion 15 of the male fitting portion 1a (the extension line of the small diameter portion 17 in the tube axial cross section of the male fitting portion 1a) It is desirable to make the taper angle of the tapered portion 25 of the ring member 5 larger or equal to the angle between the slope portion 15 and the slope portion 15).

  In this state, the outer peripheral surface of the water blocking member 7 is in close contact with the inner surface of the cylindrical portion 35 of the female fitting portion 30a. That is, the water blocking member 7 can fill the gap between the male fitting portion 1a and the female fitting portion 30a. For this reason, it is possible to prevent moisture from entering the connection structure 10 from the outside.

  In addition, since the water blocking member 7 is disposed closer to the base than the ring member 5, when the male fitting portion 1 a is pushed into the female fitting portion 30 a, the female fitting portion 30 a is the water blocking member 7. It does not receive resistance by the water blocking member 7 until it contacts with. For this reason, pushing resistance to the female fitting part 30a of the male fitting part 1a can be made small.

  The shapes of the male fitting portion 1a and the female fitting portion 30a are made of a material having sufficient strength, and are fitted to a tensile tester in a state in which both are fitted, and the tensile tester is used. The load was applied and the drawing load was determined. As a result, the drawing load satisfied 100 kg. Therefore, it has been confirmed that the drawing force of the joint portion has a sufficient drawing force.

  Next, a conduit having the male fitting portion 1a will be described. FIG. 10 is a view showing a conduit 40a. The conduit 40a has a fitting structure at both ends, and is formed at a male fitting portion 1a formed at one end of the tube 3a and at the other end of the tube 3a. And a female fitting portion 30a having a shape that can be fitted to the portion 1a. In the following description, although an example in which the diameter reducing rib 33 is provided will be described, the diameter reducing rib 33 may be omitted.

  The electric wire tube 40a is formed with a continuous spiral waveform 41 of a predetermined pitch on the outer peripheral surface of the tube 3a between the male fitting portion 1a and the female fitting portion 30a. If such a conduit 40a is used, a plurality of conduits 40a can be connected to each other and used. For example, the method of connecting the electric conduit 40a is the same as the method of connecting the male fitting portion 1a and the female fitting portion 30a described above. That is, the male fitting portion 1a of one conduit tube 40a is inserted into the female fitting portion 30a of the other conduit tube 40a, and the male fitting portion 1a of the one conduit tube 40a is inserted. It is possible to obtain the connection structure of the electric wire tube in which the mold fitting portion 1a and the female fitting portion 30a of the other electric wire tube 40a are fitted and connected. Therefore, in connection of conduits 40a, since screwing-in of a helical coupling etc. is not required, construction is easy.

  The shape of the tube is not limited to this. FIG. 11 (a) is a view showing a conduit 40b. 11 (b) is an enlarged cross-sectional view in the vicinity of the N portion in FIG. 11 (a), and FIG. 12 (a) is a cross-sectional view along the line L-L in FIG. 11 is a cross-sectional view taken along the line MM of FIG. The conduit 40b is different in that a tube 3b is applied instead of the tube 3a of the conduit 40a.

  As shown in FIGS. 12 (a) and 12 (b), in the electric conduit 40b, a peak 43 (large diameter) is formed on the outer peripheral surface of the tube 3b between the male fitting portion 1a and the female fitting portion 30a. The diameter portion) and the valley portion 45 (small diameter portion) are alternately formed. The ridges 43 have a substantially square cross section, and the valleys 45 have a circular cross section. The diameter (length of one side) of the ridge portion 43 is larger than the outer diameter of the valley portion 45.

  By alternately providing the substantially square peak portions 43 with respect to the valley portions 45 as described above, when the conduits 40b are stacked, the conduits 40b can be stably arranged. The maximum outer diameter of the female fitting portion 30 a is smaller than the diameter (length of one side) of the peak portion 43. Therefore, when viewed from the end on the female fitting portion 30 a side, the female fitting portion 30 a does not protrude to the outer periphery of the peak portion 43. Therefore, when making peak parts 43 contact and piling up electric conduit 40b, female type fitting part 30a does not interfere with adjacent electric conduit 40b.

  Moreover, as shown in FIG.11 (b), a pair of projection part 47 is formed in the approximate-central part of the valley part 45 with respect to the pipe-axis direction of the tubular body 3b. Further, a flat portion 49 is formed between the protrusions 47 in the cross section of the tube 3b in the tube axial direction. Thus, by forming the groove shape between the protrusions 47, a cutter can be used along the groove, and cutting of the tube 3b is easy. Moreover, since the cutting position does not easily shift, the pipe 3b can be cut with high accuracy. Of course, although not shown, it is possible to form the valley 45 as a straight pipe having a circular cross section without providing a pair of projections in the valley 45.

  FIG. 13 is a view showing a conduit 40c. The conduit 40c is different in that a tube 3c is applied instead of the tube 3a of the conduit 40a. Similar to the tubular body 3b, the tubular body 3c has peak portions 43 of substantially square shape and valley portions 45 of circular shape alternately.

  The valley 45 of the tube 3 c is sufficiently longer than the length of the ridge 43. Further, in the cross section in the tube axial direction of the tube 3c, the valleys 45 are formed in a wave shape. The maximum outer diameter of the waveform in the valley portion 45 is smaller than the outer diameter of the peak portion 43. Similarly to the conduit 40b, when the conduits 40c are stacked, the conduit 40c can be stably arrayed by providing the mountain portion 43 having a substantially square shape.

  Next, a bell block connectable to the above-described conduit will be described. FIG. 14 is a cross-sectional view of the bell block 50. As shown in FIG. The bell block 50 can be connected to the conduit 40b or the like, and has the same structure as the female fitting portion 30a. That is, on the inner surface on one end side of the bell block 50, the cylindrical portion 35, the sloped portion 37 gradually decreasing in diameter from the cylindrical portion 35, and the sloped portion 37 are sequentially arranged from one tip end side (opening side). It has a ring fitting portion 39 expanded from the minimum inner diameter portion. Further, the other end of the bell block 50 is formed with a bell mouth 53 whose inner diameter gradually widens toward the open end.

  The bell block 50 is connected to the female fitting portion 30a with the male fitting portion 1a such as the electric conduit 40b inserted. Moreover, from the bell mouth 53, a wire etc. can be penetrated inside.

  FIG. 15 is a view showing a handhole 55 having a plurality of bell blocks 50. As shown in FIG. The hand hole 55 is, for example, a box made of concrete, and the bell block 50 is embedded in the concrete. That is, a plurality of through holes are formed by the bell block 50 on the side surface of the concrete hand hole 55. A connection hole may be formed in the hand hole 55, and the outer periphery of the bell block 50 inserted in the connection hole may be hardened with a mortar, an epoxy putty, or the like to fix the bell block 50 in the hand hole 55.

  FIG. 16 is a cross-sectional view showing a connection structure 10 a between the bell block 50 provided in the hand hole 55 and the electric conduit 40 b. In addition, it replaces with the conduit 40b and another conduit can also be applied. As described above, in the hand hole 55, a plurality of bell blocks 50 are disposed. The conduit 40 b is connected to part or all of the bell block 50. That is, the connection structure 10a includes the hand hole 55 having the bell block 50 and the conduit 40b, and the bell block 50 having the same structure as the female fitting portion 30a and the male fitting portion 1a of the conduit 40b. And are connected.

  The method of connecting the conduit 40b and the bell block 50 is the same as the method of connecting the conduits described above. That is, the male fitting portion 1a is inserted into the female fitting portion 30a of the bell block 50 in the same procedure as the method described above, instead of the female fitting portion 30a of one electric conduit 40b. Just do it. By doing this, the connection structure of the conduit for connecting the hand hole 55 having the bell block 50 having the same structure as the female fitting portion 30a of the conduit and the male fitting portion 1a of the conduit 40b. You can get 10a.

  Here, as described above, since the electric wire tube 40b is a rectangular electric wire tube, the electric wire tube 40b can be stacked in multiple tiers and can be compactly arranged. For this reason, while it becomes possible to reduce the amount of excavation of the earth and sand at the time of the burial of the conduit 40b, since it is possible to backfill it collectively, the load of construction reduces. As a result, the construction period can be shortened and the construction cost can be reduced.

  For example, the conduit 40b of the present invention can connect the conduits 40b only by inserting the male fitting portion 1a into the female fitting portion 30a. Therefore, unlike the conduits connected by the pipe joint having the spiral groove, for example, the conduits 40b of the same size can be directly connected to each other.

  The handhole 55 and the conduit 40b are connected by the male fitting portion 1a of the conduit 40b and a bell mouth having a fitting portion to be fitted with the female fitting portion 30a. Also good.

  FIG. 17 is a view showing the bell block 50a. In the present invention, a member that can be connected to the various conduits described above and has the same structure as the male fitting portion 1a or the female fitting portion 30a on at least one side is referred to as a tube joint. There is a case.

  Unlike the bell block 50, the bell block 50a includes a male fitting portion 1a. That is, one end of the bell block 50a has the same structure as the male fitting portion 1a, and the other end is the bellmouth 53. In this case, by projecting the male fitting portion 1a from the outer surface of the hand hole 55, connection with the female fitting portion 30a of the conduit can be made.

  FIG. 18A is a view showing the pipe joint 60 a. The fitting 60a has the same structure as the male fitting portion 1a at both ends. By using the pipe joint 60a, conduits provided with the female fitting portion 30a at the end can be connected to each other. For example, both ends can also connect the conduits of the female fitting portion 30a. Moreover, the female fitting part 30a can also be converted into the male fitting part 1a.

  Here, in the case where the conduit 40b is repeatedly connected to form a conduit of the conduit 40b, for example, the bell block 50 having the shape of the female fitting portion 30a is disposed in two opposing hand holes 55. . Next, the male fitting portion 1 a is fixed to the hand hole 55 by inserting the male fitting portion 1 a into the bell block 50 of one hand hole 55. The female fitting portion 30a at the other end of the conduit 40b after fitting is extended by connecting the male fitting portion 1a of the next conduit 40b adjacent thereto.

  Also, in parallel with this operation, the male fitting portion 1a of the conduit 40b is inserted and connected to the bell block 50 of the other hand hole 55 facing each other. By connecting the male fitting portion 1a of the next conduit 40b adjacent to the female fitting portion 30a at the other end of the conduit 40b after the fitting is completed, the conduit is extended. When this operation is repeated from the hand holes 55 on both sides, a portion where the conduit 40b wraps is generated. Therefore, it is necessary to adjust the length of the conduit 40b. The length adjustment of the conduit 40b is performed by cutting and connecting the valleys 45 of the conduit 40b extended from both sides.

  By the way, when the electric conduit 40b is connected in this way, a pipe cut at one end by the female fitting portion 30a and at the other end by the valley portion 45 comes out as an end material. It is more economical to use this end material as a pipe for forming a conduit without discarding it. In order to use the end material, it is effective to use a pipe fitting 60a in which one end is a male fitting portion 1a and the other end is also a male fitting portion 1a.

  When the ends of the male fitting portion 1a are connected to the female fitting portion 30a of the end piece, a tube is obtained in which one end is cut by the male fitting portion 1a and the other end is the valley portion 45. By setting one end as the male fitting portion 1 a, it can be connected to one of the bell blocks 50 having a female shape formed in the two hand holes 55 facing each other. Further, by adjusting the length of the tube extending from the other hand hole 55, a wire conduit connecting the hand holes is formed. Here, when the cut tubes whose one end is the valley portion 45 face each other in this way, connection can be made using a dedicated joint for connecting the valley portions 45 facing each other.

  Here, as described above, the conduit 40b is provided with the two protrusions 47 facing the valley 45, and a groove shape is formed between the protrusions 47. In the case of cutting a conduit without such a projection 47 and not having a groove shape, there is no mark of the part to be cut and there is no guide groove for cutting, so when cutting The cutter may slip and the electric conduit may be cut obliquely. In particular, in the case of rainy weather, etc., since the conduit is wet, the conduit and the blade become slippery at the time of cutting, so the conduit is not cut at a predetermined position and is also easily cut diagonally. Thus, when attempting to connect the obliquely cut conduits, the positions of the ends of the conduits in the pipe joint may not be properly adjusted, and the connection at the pipe joint may not be possible. In such a case, the disconnected conduit is wasted.

  On the other hand, the conduit 40b can use a cutter along the groove by providing two projections 47 facing the valley 45 and forming a groove shape between the projections 47. For this reason, it is easy to grasp the cutting position, and it is possible to suppress the slip of the cutter. Therefore, the cutting position does not shift or is not cut obliquely.

  Moreover, FIG.18 (b) is a figure which shows the pipe joint 60b. One end of the pipe joint 60b has the same structure as the male fitting portion 1a, and the other end has the same structure as the female fitting portion 30a. By using the pipe joint 60b, it is possible to connect a conduit provided with the male fitting portion 1a at at least one end and a conduit provided with the female fitting portion 30a at at least one end. it can.

  FIG. 19 (a) is a view showing a pipe joint 60c. The fitting 60c has the same structure as the female fitting portion 30a at both ends. By using the pipe joint 60c, conduits provided with the male fitting portion 1a can be connected to each other at one end. For example, it is also possible to connect the conduits of the male fitting portion 1a at both ends. Moreover, the male fitting part 1a can also be converted into the female fitting part 30a.

  FIG. 19 (b) is a view showing a pipe joint 60 d. The pipe joint 60d has one end having the same structure as the female fitting portion 30a, and the other end having a helical corrugation 61 continuous with the outer surface (and the inner surface) of the tube. By using the pipe joint 60d, it is possible to connect a conduit provided with the male fitting portion 1a at at least one end and a conduit having a helical corrugated shape on the outer surface. Thus, if a pipe joint as shown in FIG. 19 (b) is used, a wire having different cross-sectional shapes of a wire tube having a rectangular cross-sectional shape as in the present invention and a wire tube having a spiral wave shape on the outer surface. A different kind of pipe joint that connects the pipes can be realized.

  As described above, according to the present embodiment, since the ring member 5 used for the connection portion such as a conduit or the like is disposed on the outer surface of the male fitting portion 1a, the ring member 5 can be easily visually recognized. it can.

  In addition, since the ring member 5 can slide in the ring member placement portion 11, when pushing the male fitting portion 1a into the female fitting portion 30a, the diameter of the end portion of the ring member 5 is increased in diameter It can be moved from the portion 13 to the small diameter portion 17. Therefore, the diameter of the ring member 5 having a C-shaped cross section can be easily reduced.

  As described above, since the diameter of the entire ring member 5 is reduced, the diameter of the ring member 5 can be easily reduced even if the thickness of the claw portion 23 of the ring member 5 to which the extraction force is applied is increased. As a result, the male fitting portion 1a and the female fitting portion 30a can be easily connected, and the male fitting portion 1a can be reliably prevented from coming off from the connected state.

  Further, after the connection, when a force is applied in the direction in which the male fitting portion 1 a is pulled out, the ring member 5 moves to the position of the large diameter portion 13. For this reason, the diameter reduction of the ring member 5 can be suppressed. Such an effect can also be obtained by the diameter reduction rib 33.

  Further, since the water blocking member 7 is disposed closer to the base than the ring member 5, when the male fitting portion 1a is inserted into the female fitting portion 30a, the insertion resistance of the water blocking member 7 is not easily received. be able to. In addition, even if the lubricant is applied to the water blocking member 7, the lubricant does not adhere to the ring member 5.

  In addition, since the conduits 40a and the like have the male fitting portion 1a at one end and the female fitting portion 30a at the other end, it is easy to connect a plurality of conduits 40a. It is.

  In particular, since the substantially square peak portions 43 and the circular valley portions 45 are alternately formed on the outer peripheral surface of the tube, the conduit 40b is stably stabilized when laminating the plurality of conduits 40b. The conduit 40b can be stacked. In the electric conduit 40b, a pair of projections 47 is formed substantially at the center of the valley 45 in the axial direction of the tube, and a groove is formed between the projections 47. The conduit 40a can be easily cut. Therefore, it is possible to maintain high accuracy of the cut position of the cut tube, and to construct a highly accurate conduit connection structure and a conduit of the conduit.

  Moreover, various conduits can be easily connected by using the pipe joint which comprises the male fitting part 1a or the female fitting part 30a at at least one end. Similarly, by using a bell block provided with the male fitting portion 1a or the female fitting portion 30a at one end, the bell block and the electric pipe can be easily connected.

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

1a ...... Male fitting portion 3, 3a, 3b, 3c ...... Tube 5 ...... Ring member 7 ...... Water blocking member 9 ...... Locking wall 10, 10a ...... Connection structure 11 ......... Ring member arrangement part 13 ... ... Large diameter part 15 ... ... Slope part 17 ... ... Small diameter part 19 ... ... Cutting part 21 ... ... Taper part 23 ... ... Nail part 25 ... ... Taper part 27: Water sealing member accommodating portion 29: Clearance 30a: Female fitting portion 31: Flat portion 35: Tubular portion 37: Slope portion 39: Ring fitting portion 40a, 40b, 40c ..... Conduit tube 41 ... Wave shape 43 ... Peak 45 ... Valley 47 ... Projection 49 ... Flat 50, 50a ... Bell block 53 ... Bell mouth 55 ... Hand holes 60a, 60b, 60c, 60d ··· Pipe fitting 61 ··· Wave shape

Claims (27)

A conduit having a male fitting portion formed on an outer peripheral portion in the vicinity of an end portion of a tubular body,
The male fitting portion is a pair of locking walls disposed apart in the tube axis direction;
A ring member disposed in an area sandwiched by the locking walls;
Equipped with
The ring member has a substantially C shape in which a part in the circumferential direction is cut,
In a cross section of the ring member in the axial direction of the ring member, the ring member is flat on the inner surface, has claws on the outer surface, and tapers to one end of the ring member on both the outer and inner surfaces. Has a tapered portion,
The ring member is disposed such that the tapered side by the tapered portion is positioned on the tip side of the pipe body,
A large diameter portion is formed on the tip end side of the tube in the region sandwiched by the locking wall, and a small diameter portion is formed on the base side of the tube in the region sandwiched by the locking wall, A sloped portion is formed between the large diameter portion and the small diameter portion,
The length of the ring member in the tube axis direction excluding the tapered portion is equal to the length of the small diameter portion or shorter than the length of the small diameter portion,
The wire has a clearance between the ring member and at least one of the locking walls, and the ring member is slidable to any position of the large diameter portion or the small diameter portion. tube.   The water pipe according to claim 1, wherein a water blocking member is provided on the base side of the locking wall on the base side of the male fitting portion.   In the region sandwiched by the locking wall, the diameter reducing rib having a diameter larger than the outer diameter of the large diameter portion is continuous with the small diameter portion from the large diameter portion with the beveled portion interposed therebetween. The electric wire tube according to claim 1 or 2, wherein the cut portion of the ring member is fitted to the reduced diameter limiting rib. A conduit having a fitting structure at both ends,
Tube body,
A male fitting formed at one end of the tube;
A female fitting portion formed at the other end of the tube and having a shape capable of being fitted to the male fitting portion;
Equipped with
The male fitting portion is formed on an outer peripheral portion of the tube, and is provided with a pair of locking walls spaced apart in the axial direction of the tube.
A ring member disposed in an area sandwiched by the locking walls;
Equipped with
The ring member has a substantially C shape in which a part in the circumferential direction is cut,
In a cross section of the ring member in the axial direction of the ring member, the ring member is flat on the inner surface, has claws on the outer surface, and tapers to one end of the ring member on both the outer and inner surfaces. Has a tapered portion,
The ring member is disposed such that the tapered side by the tapered portion is positioned on the tip side of the pipe body,
A large diameter portion is formed on the tip end side of the tube in the region sandwiched by the locking wall, and a small diameter portion is formed on the base side of the tube in the region sandwiched by the locking wall, A sloped portion is formed between the large diameter portion and the small diameter portion,
The axial length of the ring member is shorter than the length of the small diameter portion,
The ring member has a clearance between the ring member and at least one of the locking walls, and the ring member is slidable to either the large diameter portion or the small diameter portion.
The female fitting portion is formed on the inner peripheral portion of the tube, and from the tip end, a cylindrical portion, a slope portion gradually reducing the diameter from the cylindrical portion, and a minimum inner diameter portion of the slope portion An electrical conduit comprising: an enlarged ring fitting portion.   In the region sandwiched by the locking wall, the diameter reducing rib having a diameter larger than the outer diameter of the large diameter portion is continuous with the small diameter portion from the large diameter portion with the beveled portion interposed therebetween. The width of the diameter-reducing rib in the small diameter portion is narrower than the width of the diameter-reducing rib in the large diameter portion, and the cut portion of the ring member fits into the diameter-reducing rib. A conduit according to claim 4.   The electric pipe according to claim 4 or 5, wherein a water blocking member is provided further on the base side than the locking wall on the base side of the male fitting portion.   Between the male fitting portion and the female fitting portion, a helical waveform having a predetermined pitch and continuous to the outer peripheral surface of the tubular body is formed. The conduit according to any one of the above.   Between the male fitting portion and the female fitting portion, a large diameter portion as a substantially square peak portion and a small diameter portion as a circular valley portion are alternately formed on the outer peripheral surface of the tube. The conduit according to any one of claims 4 to 6, characterized in that:   A pair of protrusions are formed at a substantially central portion of the small diameter portion as the valley with respect to the tube axis direction of the tube, and a flat portion is formed between the protrusions in the tube axial cross section of the tube. A conduit according to claim 8, characterized in that:   The conduit according to claim 8, wherein the small diameter portion as the valley portion is formed in a corrugated shape in a cross section in the axial direction of the tube.   The conduit according to claim 6, wherein the water blocking member is disposed in a water blocking member accommodating portion formed on the base side further than the locking wall on the base side of the male fitting portion. .   7. The conduit according to claim 6, wherein the ring member is any of ABS resin, PP resin, hard vinyl chloride, or a mixed resin or polymer alloy of any of these with PC resin.   The conduit according to claim 6, wherein the water blocking member is either a rubber or a water expansion member. It is the connection structure of the conduit according to any one of claims 4 to 13,
By using a plurality of the conduits, the male fitting portion of one of the conduits and the female fitting portion of the other conduits are engaged and connected,
The maximum thickness of the ring member is determined by the radial clearance between the small diameter portion of the male fitting portion and the minimum inner diameter portion of the slope portion of the female fitting portion and the large diameter portion of the male fitting portion And the radial direction clearance of the ring fitting portion of the female fitting portion. It is the connection structure of the conduit according to any one of claims 4 to 13,
Using a handhole having a bell block and the conduit
A connection structure for a conduit according to the present invention, the bell block having the same structure as the female fitting portion is connected to the male fitting portion of the conduit. The handhole has a plurality of the bell blocks,
The connection structure of a conduit according to claim 15, wherein the conduit is connected to a part or all of the bell block.   A bell block connectable to the conduit according to any one of claims 4 to 13, and having the same structure as that of the female fitting portion. A method for connecting conduits according to any one of claims 4 to 13, wherein
Inserting the tip of the male fitting portion into the female fitting portion;
The tapered portion of the outer periphery of the ring member disposed in the region sandwiched by the locking wall is brought into contact with the inclined surface portion of the female fitting portion to make the ring member a part of the male fitting portion. Sliding to the small diameter portion to reduce the diameter, and storing the ring member in the small diameter portion of the male fitting portion;
When the end of the claw portion passes through the inclined surface of the female fitting portion, the claw portion is formed on the ring fitting portion formed on the base side of the inclined surface of the female fitting portion. A method of connecting conduits characterized in that they are housed. A method of connecting a conduit and a bell block according to any one of claims 11 to 13,
The bell block has the same structure as the female fitting portion of the electrical conduit,
Inserting the tip of the male fitting portion into the bell block;
The tapered portion of the outer periphery of the ring member disposed in the region between the locking walls is brought into contact with the sloped portion of the bell block to make the ring member a smaller diameter portion of the male fitting portion Sliding to reduce the diameter, and storing the ring member in the small diameter portion of the male fitting portion;
When the end of the claw portion passes through the sloped portion of the bell block, the claw portion is accommodated in the ring fitting portion formed on the base side of the sloped portion of the bell block. How to connect the conduit and the bell block.   A pipe joint connectable to the conduit according to any one of claims 4 to 13, wherein at least one end has the same structure as that of the male fitting portion.   21. A fitting as claimed in claim 20, characterized in that both ends have the same structure as the male fitting.   21. A tube fitting according to claim 20, characterized in that one end has the same structure as the male fitting and the other end is a bellmouth.   21. A tube fitting according to claim 20, wherein one end has the same structure as the male fitting portion and the other end has the same structure as the female fitting portion.   A pipe joint connectable to the conduit according to any one of claims 4 to 11, wherein at least one end has the same structure as that of the female fitting portion.   25. A fitting as claimed in claim 24, characterized in that one end has the same structure as the female fitting and the other end is a bellmouth.   25. A tube according to claim 24, characterized in that one end has the same structure as said female fitting and the other end has a helical corrugation continuous with the outer surface of said tube. Fittings. A ring member used for a connection portion of a conduit,
The ring member is
It is approximately C-shaped, with a portion cut in the circumferential direction,
In a cross section in the tube axis direction of the ring member, the inner surface is flat, the outer surface has a claw portion, and both the outer surface and the inner surface have a tapered portion tapered toward one end of the ring member. Ring member characterized by

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