JP6171244B2 - Corrugated tube, cable structure, corrugated tube manufacturing method and corrugated tube material manufacturing method - Google Patents

Description

  The present invention relates to a corrugated tube or the like that has an opening that is continuous in the longitudinal direction and is closed so that a part of the ends overlap each other.

  Conventionally, when laying an electric wire or the like, the electric wire or the like is inserted into a protective tube. Usually, since a protective tube is tubular, in order to insert an electric wire into such a tubular member, it is necessary to sequentially feed the electric wire from an end portion. However, this work has not always been easy.

  On the other hand, there is a method in which a part of the tubular member is cut along the longitudinal direction, and an electric wire is inserted from the cut. In this case, workability is good because there is no need to feed the electric wires in the longitudinal direction.

  As such a protective tube with a cut in the longitudinal direction, a protective tube with a spiral cut in the longitudinal direction (Patent Document 1) or by providing a plurality of thin portions on the cross section of the tube and bending the thin portion There is a protective tube (Patent Document 2) that opens and closes a slit-shaped opening in the radial direction, and there is a protective tube that uses a part of the ends overlapped (Patent Document 3).

JP-A-7-135715 JP 2000-115945 A Special table 2009-542180 gazette

  Patent Document 1 is a corrugated tube into which a wire harness in which a spiral slit is formed over the entire length of the corrugated tube in order to insert the mounted body into a cylindrical corrugated tube main body. In this case, since the slit is formed in a spiral shape with respect to the tube, it is difficult for the non-attached body to pop out due to the opening of the non-attached body at the time of bending, but there is a problem that the insertability of the attached body into the corrugated tube is poor. is there.

  Patent Document 2 discloses a wire harness in which a plurality of thin-walled portions are formed along a tube axis direction at predetermined positions on a tube cross-section, and the thin-walled portions are bent so that the slit portion of the tube can be opened and closed in the radial direction. It is a corrugated tube which inserts the inside. Since this tube has a plurality of thin-walled portions, the slit portion is excellent in opening / closing properties. However, since the tube has a thin-walled portion, there is a problem that the slit opening / closing portion has low rigidity and the tube slit portion easily opens. Further, since the bent portions must be provided at two places, the manufacturability is also poor.

  The tubular member of Patent Document 3 can maintain a closed state by overlapping the ends of each other. However, since the tubular member of Patent Document 1 needs to overlap ends, it is necessary to reduce the opening size with respect to the inner diameter of the tube. For this reason, the opening is narrow and the insertion of the electric wire has become easy.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a corrugated tube or the like that has a large electric wire storage volume, is excellent in insertion workability, and is unlikely to open.

  In order to achieve the above-described object, the first invention includes an inner member, an outer member, and a hinge portion that opens or bends when the inner member and the outer member are fitted together. A plurality of crests and valleys extending in the direction are alternately formed at predetermined intervals in the tube axis direction, and in the tube vertical cross section of the inner member, an extending portion is formed on the tube opening side, and the inner member is The outer member includes a curved portion and a straight portion, and a plurality of crests and troughs extending in the circumferential direction are alternately formed at predetermined intervals in the tube axis direction. An extending portion is formed on the side, the outer member includes a curved portion and a straight portion, and when the extending portions of the inner member and the outer member are overlapped, a cross section becomes a closed tube, and The extension of each of the inner member and the outer member. In a state in which the portions are not fitted to each other, the opening dimension between the end portion of the extending portion of the inner member and the hinge portion in the tube vertical cross section is the end portion of the extending portion of the outer member. And the opening dimension between the end of the extending part of the outer member and the hinge part is larger than twice the radius of curvature of the curved part of the inner member. A corrugated tube that is large.

  Each of the inner member and the outer member may include a curved portion between the hinge portion and the extending portion in a tube vertical cross section, and the extending portion may include a linear portion. That is, the inner member may include a curved portion adjacent to the hinge portion and a straight portion as an extending portion. In the outer member, a curved portion and an extending portion adjacent to the hinge portion may be configured by a straight portion and a curved portion from the curved portion side.

  One end portion of each of the curved portions of the inner member and the outer member may be connected to the hinge portion, and the other end portion may be connected to the extending portion.

  One end of the curved portion of each of the inner member and the outer member is connected to the hinge portion via a straight portion, and the other end is the extended portion. You may connect. One end portion of the inner member and the other member of the outer member may be connected to the hinge portion with one end portion of the curved portion being connected to the hinge portion via a straight portion, or without being connected to the straight portion. The curved portion and the hinge portion may be directly connected.

  The curvature radius of each curved part of the inner member and the outer member is the same, the extending part of the inner member is constituted by a straight part, and the extending part of the outer member is constituted by a straight part and a curved part. May be.

  A taper portion is formed on the outer surface side of the end portion of the extending portion of the inner member, and a taper portion is formed on the inner surface side of the end portion of the extending portion of the outer member. When the extending portions of the outer member are fitted to each other, the tapered portion of the extending portion of the inner member may be slid and fitted against the tapered portion of the extending portion of the outer member. It may be possible. It is desirable that both the tapered portion formed at the end portion of the extending portion of the inner member and the tapered portion formed at the end portion of the extending portion of the outer member are formed at an acute angle and substantially the same angle.

  A plurality of cuts or slits may be formed in the hinge portion in accordance with the formation interval of the crests or troughs.

  A plurality of irregularities or protrusions may be formed on the hinge portion to improve the flexibility of the corrugated tube.

  The said hinge part may be comprised by the 1 or several wave shape part in a pipe | tube perpendicular cross section. In the case where the hinge portion has one wave shape V shape, or two wave shapes ω shape can be considered.

  The hinge portion is configured by a plurality of corrugated portions in a tube vertical cross section, and the adjacent corrugated portions are formed with fitting portions that can be fitted to each other to fit the inner member and the outer member. It may be possible to keep the state in which the corrugated tube is opened stably by fitting the fitting portions of the adjacent corrugated portions in a state before the fitting.

  Even when the extended portions of the inner member and the outer member are fitted to each other, at least part of the structure may be such that the ridges and valleys of the inner member and the outer member are fitted. Good.

  A fitting projection is provided on one of the overlapping portions of the inner member and the outer member, and a fitting hole is provided on the other, and the extending portions of the inner member and the outer member are fitted together. The fitting protrusion and the fitting hole may be fitted to each other.

  The opening width of the outer surface of the valley portion of the inner member is smaller than the maximum width of the protrusion on the inner surface of the valley portion of the outer member, and the maximum width of the outer surface of the mountain portion of the inner member is the inner surface of the mountain portion of the outer member. When the crests and troughs of the inner member and the outer member are fitted together, the crests and troughs are press-fitted together while the opening width is expanded. May be.

  According to the first aspect of the present invention, the opening dimension between the extension part end part of the inner member and the hinge part in the vertical section of the tube is larger than the opening dimension between the extension part end part of the outer member and the hinge part. Is also big. For this reason, the insertion operation of the electric wire is easy, and the holding force when the inner member is elastically compressed and deformed, fitted to the outer member and closed is increased. Moreover, the opening dimension between the extension part edge part of an outer side member and a hinge part is larger than twice the curvature radius of the curve part of an inner side member. For this reason, an overlapping part does not become large too much and it is easy to fit each other.

  In addition, since the curvature radii of the curved portions of the inner member and the outer member are the same, the extending portion of the inner member is constituted by a straight portion, and the extending portion of the outer member is constituted by a straight portion and a curved portion. When overlapped, the straight portions of the extended portion of the inner member and the outer member, the shape of the curved portion of the extended portion of the outer member and a part of the curved portion of the inner member substantially coincide with each other High holding power when closed.

  In addition, a tapered portion is formed on the outer surface side of the end portion of the extending portion of the inner member, and a tapered portion is formed on the inner surface side of the end portion of the extending portion of the outer member, so that the inner member and the outer member are connected to each other. When overlapping, the ends of the inner member can be guided to the inside of the outer member by sliding the ends.

  Moreover, the rigidity of a hinge part can be reduced and flexibility can be improved by putting a some notch or a slit in a hinge part according to the formation space | interval of a peak part or a trough part. For this reason, the corrugated pipe | tube excellent in flexibility as a whole can be obtained.

  In addition, such an effect can be obtained by forming a plurality of irregularities or protrusions on the hinge portion, so that when the hinge portion is opened or bent, the plurality of irregularities or projections are deformed and the hinge portion is easily deformed. Flexibility can be increased.

  Moreover, by comprising a hinge part with a some waveform part, the rigidity of a hinge part falls and it is easy to maintain an inner member and an outer member in the open state. In particular, by forming fitting portions that can be fitted to each other in adjacent wave portions, the state in which the corrugated tube is opened can be stably maintained.

  In addition, when the extended portions of the inner member and the outer member are fitted to each other, the fitting portion has a structure in which the ridge portions and the valley portions of the inner member and the outer member are fitted to each other. The holding force in the closed state can be increased by the fitting structure.

  In particular, it is possible to increase the holding force in the closed state by providing a fitting protrusion on one of the overlapping portions of the inner member and the outer member and providing a fitting hole on the other and fitting them together. .

  Also, when fitting the crests and troughs of the inner member to the troughs and crests of the outer member, the crests can be closed if they are fitted and fitted while expanding the opening width of the troughs. It is possible to increase the holding force in the state of being damaged. Moreover, since the outer member and the inner member are easily in close contact with each other and there is no thin portion except for the hinge portion, the tube has high rigidity and is difficult to open.

  2nd invention is the cable structure characterized by having arrange | positioned the electric wire inside the corrugated pipe | tube concerning 1st invention.

  According to the 2nd invention, an internal electric wire can be hold | maintained reliably.

  3rd invention is a manufacturing method of the corrugated pipe | tube which can be opened and closed, Comprising: The inner member and outer member which comprise at least a curve part and an extension part, and each one edge part of the said inner member and the said outer member are attached. A corrugated tube material comprising a hinge part to be connected and a connection part that is substantially opposite to the hinge part and that connects the ends of the extended part, which is the other end of each of the inner member and the outer member. Forming and cutting the connecting portion, wherein the opening dimension between the end portion of the extending portion of the inner member and the hinge portion is set to the end portion of the extending portion of the outer member and the hinge portion. And the opening dimension between the end of the extending part of the outer member and the hinge part is larger than twice the radius of curvature of the curved part of the inner member. This is a method for manufacturing a corrugated pipe.

  When the connection portion of the corrugated tube material is cut, a tapered portion is formed on the outer surface side at the opening end portion of the inner member, and a tapered portion is formed on the inner surface side at the opening end portion of the outer member. When the extension portions of the inner member and the outer member are fitted to each other after the connection portion is cut, the taper portion of the extension portion end portion of the inner member is changed to the extension portion end of the outer member. It may be possible to slidably fit the taper portion of the portion.

  According to the third invention, it is possible to obtain a corrugated tube excellent in electric wire insertion workability and holding power when closed.

  Further, by forming the tapered portion at the end portion, the end portion of the inner member can be guided to the inner side of the outer member when closing. Therefore, it is easy to fit the inner member and the outer member.

  4th invention is a manufacturing method of a corrugated-pipe raw material, Comprising: A corrugated-pipe raw material is an inner member and an outer member which comprise at least a curve part and an extending part, and each one of the said inner member and the said outer member A hinge portion that connects the end portions, and a connection portion that substantially opposes the hinge portion, and that connects the end portions of the extended portion, which are the other end portions of the inner member and the outer member, The asymmetrical cross-section of the corrugated tube material is a major axis, the major axis of the corrugated tube material being the major axis, and the major axis is divided into two equal parts through the hinge and perpendicular to the major axis. When the short axis is a short axis, the short axis is a dividing line of the mold, and each of the pair of molds is formed so as to include either the inner member or the outer member with respect to the dividing line. Connect each of them in a loop, each A pair of the molds face each other on a part of the loop, and a resin tube is supplied by extrusion molding into the pair of the molds that are combined to face each other, and the transfer speed of the mold is controlled by the resin. A corrugated tube material characterized in that the mold is repeatedly transferred and fed while being synchronized with the extrusion speed of the tube, and the resin tube is sucked into the mold and formed into a shape that matches the mold shape. It is a manufacturing method.

  According to the fourth invention, it is possible to obtain a corrugated tube material excellent in electric wire insertion workability and holding power when closed.

  ADVANTAGE OF THE INVENTION According to this invention, the corrugated pipe | tube etc. which were excellent also in the insertion workability | operativity of an electric wire can be provided.

The perspective view which shows the corrugated pipe | tube 1 of the open state. The front view seen from the pipe-axis direction which shows the corrugated pipe 1 of the open state. (A), (b) is a figure which shows the process of closing the corrugated pipe | tube 1. FIG. (A), (b), (c) is the elements on larger scale which show the process of closing the corrugated pipe | tube 1. FIG. The front view seen from the pipe-axis direction which shows the corrugated pipe 1 of the closed state. (A) is sectional drawing which shows the peak part 9 and the trough part 11 of the outer side member 5, (b) is sectional drawing which shows the peak part 13 and the trough part 15 of the inner side member 3, (c) is the inner side member 3 Sectional drawing which shows the state which made the peak part and trough part of the outer side member 5 fit. (A) is sectional drawing which shows the other peak part 9 and trough part 11 of the outer member 5, (b) is sectional drawing which shows the other peak part 13 and trough part 15 of the inner member 3, (c) is Sectional drawing which shows the state which fitted the peak part and trough part of the inner member 3 and the outer member 5, (d) is sectional drawing which shows the other peak part 13 and trough part 15 of the inner member 3. FIG. The figure which shows the pipe raw material manufacturing apparatus 50. FIG. The figure which shows the corrugated pipe raw material 61. FIG. The bottom view which shows the corrugated pipe 1a. (A) is a bottom view which shows the corrugated pipe 1b, (b) is the PP sectional view taken on the O section of (a). (A) is the front view seen from the pipe-axis direction which shows the corrugated pipe 1c of the open state, (b) is an expanded sectional view of the hinge part 7a. (A) is the front view seen from the pipe-axis direction which shows the corrugated pipe 1c of the state closed slightly, (b) is an expanded sectional view of the hinge part 7a. The top view which shows the corrugated pipe 1d. (A) is the front view seen from the pipe-axis direction which shows the corrugated pipe 1d of the closed state, (b) is the R section enlarged view of (a). The front view seen from the pipe-axis direction which shows the corrugated pipe 1e of the open state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a corrugated pipe 1, and FIG. 2 is a front view seen from the pipe axis direction. The corrugated tube 1 includes an inner member 3, an outer member 5, a hinge portion 7, and the like.

  In the inner member 3, a plurality of crests 13 and troughs 15 extending in the circumferential direction are periodically and alternately formed at predetermined intervals in the tube axis direction. Similarly, the outer member 5 has a plurality of crests 9 and troughs 11 extending in the circumferential direction alternately formed at predetermined intervals in the tube axis direction. The inner member 3 and the outer member 5 are connected by a hinge portion 7.

  As shown in FIG. 2, one end portion of the inner member 3 is connected to the hinge portion 7. A predetermined range from the joint portion of the inner member 3 to the hinge portion 7 is a curved portion 17. The curved portion 17 has a constant radius of curvature C. A portion extending from the other end side of the curved portion 17 toward the tube opening portion is a straight portion 25. The straight portion 25 of the inner member 3 is referred to as an extending portion 27.

  One end of the outer member 5 is connected to the hinge portion 7. A predetermined range from the joint portion of the outer member 5 to the hinge portion 7 is a curved portion 18. The curved portion 18 has a constant radius of curvature D. A predetermined range from the other end side of the curved portion 18 is a straight portion 19. Further, a portion extending from the end portion of the straight portion 19 toward the tube opening portion is a curved portion 21. The curved portion 21 has a constant radius of curvature E. In addition, the site | part which match | combined the linear part 19 and the curve part 21 of the extension part of the outer side member 5 is called the extension part 23. FIG.

In the present invention, before the inner member 3 and the outer member 5 are closed, the opening dimension (A in the drawing) between the end portion of the extending portion 27 of the inner member and the hinge portion 7 is the outer member 5. It is larger than the opening dimension (B in the figure) between the end of the extended portion 23 (curved portion 21) and the hinge portion 7. Moreover, the opening dimension (E in the figure) between the extended portion 23 end of the outer member 5 and the hinge part 7 is larger than twice the radius of curvature (C in the figure) of the curved portion 17 of the inner member 3. That is,
A>B> 2C
Satisfy the relationship.

  Here, it is desirable that the curvature radii C, D, and E of the curved portions are substantially the same. By doing in this way, when the pipe | tube mentioned later is closed, a mutual overlap part can be fitted reliably, and the shape of the obstruction | occlusion pipe | tube can be made into a flat pipe | tube shape. For this reason, 2C in the above formula may be 2D or 2E.

  Thus, by making the opening dimension between the end part of the extending part 27 and the hinge part 7 larger than the opening dimension between the extending part 23 end part and the hinge part 7, the electric wire described later Good insertion workability. Further, if the opening dimension between the end of the extended portion 23 and the hinge portion 7 is increased, the overlapping length described later is shortened, so that the holding force in the closed state is weakened. For this reason, it is desirable that A> B.

  Moreover, the opening dimension between the extension part 23 end part and the hinge part 7 is made larger than twice the curvature radius of the curved part 17 of the inner member 3 (that is, the diameter of the circle having the curved part 17). It is possible to suppress the superposition length from becoming excessively long. This is because if the overlapping length becomes too long, it becomes difficult to fit the inner member 3 and the outer member 5 described later. For this reason, it is desirable that B> 2C. In addition, said relationship is satisfied also in arbitrary pipe | tube vertical cross sections.

  Next, the usage method of the corrugated pipe 1 concerning this invention is demonstrated. FIG. 3A is a diagram showing a released state of the corrugated pipe 1. With the corrugated tube 1 open, the electric wire 29 is inserted into the inner member 3 from the opening, for example. Note that a plurality of electric wires 29 may be provided. At this time, as described above, since the opening width of the inner member 3 is sufficiently wide, the insertion operation of the electric wire 29 is easy.

  Next, as shown in FIG. 3B, the inner member 3 and the outer member 5 are closed (arrow F in the figure). That is, the ends of the extending portions 23 and 27 are brought close to each other.

  4 (a) to 4 (d) are diagrams showing a process in which the extending portions 23 and 27 are fitted, and are enlarged views of a G portion in FIG. 3 (b). First, when the inner member 3 and the outer member 5 are closed, the ends of the extending portions 23 and 27 approach each other as shown in FIG. 4A (arrow F in the figure).

  Here, a tapered portion 33 is provided on the outer surface side of the extending portion 27 of the inner member. That is, the taper portion 33 is formed such that the tip position on the inner peripheral side protrudes toward the opposing outer member 5 with respect to the tip position on the outer peripheral side of the extending portion 27. Similarly, a tapered portion 31 is provided on the inner surface side of the extending portion 23 of the outer member. That is, the tapered portion 31 is formed such that the distal end position on the outer peripheral side protrudes toward the opposing inner member 3 side with respect to the distal end position on the inner peripheral side of the extending portion 23.

  For this reason, as shown in FIG. 4B, when the extended portion 23 of the outer member and the extended portion 27 of the inner member abut, the tip of the extended portion 27 of the inner member is formed by the tapered portions 31 and 33. Are opposed to the inside of the extending portion 23 of the outer member. In addition, at the moment when the tips of the extending portions 23 and 27 come into contact with each other, the tip of the inner member 3 is slightly crushed as necessary, so that the inner member 3 is more reliably brought into the inner surface side of the outer member 5. Can be fitted.

  In this state, when the inner member 3 and the outer member 5 are further closed, as shown in FIG. 4C, the tip of the extending portion 27 of the inner member slides inside the extending portion 23 of the outer member. Be guided. That is, the inner member 3 is guided inside the outer member 5.

  FIG. 5 is a view showing a state in which the inner member 3 and the outer member 5 are further closed as they are, and the extending portions 23 and 27 are completely fitted. That is, by extending and fitting the extended portions 23 and 27 of the inner member 3 and the outer member 5 to each other, it is possible to obtain a flat closed cross section. In the present invention, the structure in which the electric wires are arranged in the corrugated tube 1 is referred to as a cable structure.

  6A is a partial cross-sectional view of the crest 9 and the trough 11 of the outer member 5, and FIG. 6B is a partial cross-sectional view of the crest 13 and the trough 15 of the inner member 3. As described above, a plurality of crests 9 and troughs 11 are alternately formed on the outer peripheral surface of the outer member 5. A plurality of crests 13 and troughs 15 are alternately formed on the outer peripheral surface of the inner member 3. Here, the interval between the crests 9 or troughs 11 of the outer member 5 with respect to the tube axis direction is equal to the interval between the crests 13 or troughs 15 of the inner member 3.

  Here, the crest 9 of the outer member 5 is wider than the crest 13 of the inner member 3, and the trough 15 of the inner member 3 is wider than the trough 11 of the outer member 5. The opening width on the inner surface side of the peak portion 9 of the outer member 5 is wider than the width on the outer surface side of the peak portion 13 of the inner member 3. The opening width of the valley portion 15 of the inner member 3 is wider than the protrusion width on the inner surface side of the valley portion 11 of the outer member 5.

  For this reason, as shown in FIG. 6C, the peak portion 13 of the inner member 3 is fitted into the inner surface side of the peak portion 9 of the outer member 5, and the valley portion 11 of the outer member 5 is Fit into the valley 15. That is, the peak portions and the valley portions of the inner member 3 and the outer member 5 are fitted to each other. It is desirable that the side taper angle on the inner surface side of the peak portion 9 and the side taper angle on the outer surface side of the peak portion 13 are substantially matched. Further, it is desirable that the side taper angle on the inner surface side of the valley portion 11 and the side taper angle on the outer surface side of the valley portion 15 are substantially matched. By doing in this way, the crests of the inner member 3 and the outer member 5 and troughs can mutually fit.

  In the present invention, in order to fit the ridges and valleys of the inner member 3 and the outer member 5 to each other, the shape of the ridges and valleys is not limited to the example shown in FIG. .

  Fig.7 (a) is a fragmentary sectional view of the peak part 9 and the trough part 11 of the outer member 5 concerning other embodiment, FIG.7 (b) is the peak part of the inner member 3 concerning other embodiment. 13 is a partial cross-sectional view of 13 and a valley portion 15. In the example shown in FIG. 7A, the side taper angles of the peaks 9 and valleys 11 are opposite to those in FIG. That is, the opening of the valley portion 11 is configured to gradually narrow from the bottom surface toward the mountain portion 9. Further, the width of the top portion of the peak portion 9 is formed so as to be gradually wider than the base portion of the peak portion 9. For example, as shown in FIG. 7A, the opening width I on the inner surface base portion side of the peak portion 9 is narrower than the maximum width H of the inner surface of the peak portion 9 facing this.

  Similarly, in the example illustrated in FIG. 7B, the base width K of the peak portion 13 is narrower than the maximum width J of the peak portion 13. Therefore, the opening width of the valley portion 15 is also narrower than the maximum width of the valley portion 15.

  FIG.7 (c) is a figure which shows the state which fitted these peak parts and trough parts. In this case, in the fully fitted state, the peak 13 is fitted to the inner surface of the peak 9, and the inner surface of the valley 15 is fitted to the valley 11. Here, when fitting the crest 13 and the trough 15 of the inner member 3 with the crest 9 and the trough 11 of the outer member 5, the opening width of the crest or trough is expanded (or crushed). ) Press fit. For this reason, when it is going to pull away the peak part of the inner member press-fitted from the peak part of an outer member, the peak part outer surface of an inner member is pressed with respect to the peak part outer surface of an inner member from the peak part inner side of an outer member. In addition to the fact that the pressing force is applied, since the base width K of the crest of the outer member is narrower than the maximum width J of the crest of the inner member, the crest of the inner member is replaced with the crest of the outer member. It is possible to hold the state in which the crests of the outer member and the inner member are fitted to each other more stably.

  In addition, in FIG.7 (b), although the shape of the peak part 13 showed the example comprised by the curve, this invention is not limited to this. For example, as shown in FIG.7 (d), the shape which has a linear part may be sufficient. Even in this case, the width N of the base portion of the peak portion 13 is narrower than the maximum width M. Therefore, the fitting state can be held more stably.

  In addition, when forming a linear part, it is desirable for the width | variety M of the linear part of the top part of the peak part 13 to be narrower than the opening width I of the inner surface of the peak part 9 to be fitted. By doing in this way, peak parts can be pressed in more easily. In the example configured with the curved portion, the straight portion width is zero.

(Production method)
Next, the manufacturing method of the corrugated pipe | tube 1 concerning this invention is demonstrated. FIG. 8 is a view showing the pipe material manufacturing apparatus 50. The pipe material manufacturing apparatus 50 mainly includes an extruder 55, endless tracks 53a and 53b, and the like.

  First, the resin is extruded in a cylindrical shape from the extruder 55, and the cylindrical material 57 is sent to the lower process side (in the direction of arrow U in the drawing) of the tube material manufacturing apparatus 50. The cylindrical material 57 is sandwiched between a pair of endless tracks 53a and 53b. The endless tracks 53a and 53b rotate in opposite directions, S direction and T direction, respectively. The endless tracks 53a and 53b are composed of a plurality of molds 51 and the like.

  The endless tracks 53a and 53b move in the same direction and at the same speed with respect to the feeding direction of the pipe material manufacturing apparatus 50, and have molding portions 59 that face each other. In the molding unit 59, the mold 51 and the like move in the feeding direction at the same speed in synchronization with the feeding speed of the cylindrical material 57. In the molding part 59, the molds 51 of the endless tracks 53a and 53b face each other and are in close contact with each other.

  The mold 51 is a half-divided half-cylinder member in which irregularities and the like corresponding to the outer shape of the corrugated tube material 61 are formed on the inner surface. The pair of molds 51 face each other to form a cylindrical member, and a crest and a trough corresponding to the outer shape of the corrugated tube material 61 are formed on the inner surface.

  FIG. 9 is a front view of the corrugated tube material 61. The corrugated tube material 61 includes the inner member 3, the outer member 5, and the hinge portion 7 of the corrugated tube 1. Further, the ends of the extending portions 23 and 27 are not separated and are connected by the connecting portion 63. That is, the corrugated tube material 61 is a tubular member as a whole that does not have an opening along the longitudinal direction.

  That is, the corrugated tube material 61 has a substantially oval cross section that is asymmetric with respect to the hinge portion 7. Here, an ellipse portion (maximum outer diameter portion) of the corrugated tube material 61 is defined as a major axis, and the major axis passing through the hinge portion 7 is divided into two equal parts, and a straight line perpendicular to the major axis is defined as a minor axis. In this case, each of the pair of molds 51 formed so as to include either the inner member 3 or the outer member 5 with respect to the dividing line, with the short axis as the dividing line of the mold 51 described above, is a loop shape. Are connected to each other to form endless tracks 53a and 53b. The molding part 59 is a part on each loop and is a part where the pair of molds 51 face each other.

  The cylindrical material 57 is supplied by extrusion molding into a pair of molds 51 that are combined to face each other, and the mold 51 is repeated while the transfer speed of the mold 51 is synchronized with the extrusion speed of the cylindrical material 57. To transport. That is, the cylindrical material 57 is sent to the cylindrical space formed by the mold 51.

  The mold 51 is provided with a plurality of holes, and sucks the internal air from the outside. Since the air between the mold 51 and the cylindrical material 57 is sucked to the outside of the mold 51, the cylindrical material 57 is pressed against the inner surface of the mold 51. Therefore, the cylindrical material 57 is formed into a shape corresponding to the inner shape of the mold 51. Further, the formed corrugated tube material 61 is sent from the endless tracks 53a and 53b to a cooling unit, a winding unit, and the like, which are not shown, on the rear side. In this way, the corrugated tube material 61 is manufactured.

  As shown in FIG. 9, the corrugated tube 1 can be manufactured by cutting the connecting portion of the corrugated tube material 61 with the cutting portions V and W. At this time, since the connection portion 63 can be designed to be minimized, there is little waste. In this case, the shape of the hinge part is slightly changed, and the end part of the extended part of the outer member is further rotated to the left side of the end part of the extended part of the inner member, thereby cutting the cut parts V and W. Can be made to coincide with each other so that one cut portion can be provided.

  In addition, the tapered portions 31 and 33 described above can be formed when the connection portion 63 is cut. In the example shown in FIG. 9, the taper part 31 can also be formed simultaneously with the cutting by cutting the cutting part V at an angle that becomes a tapered shape. Note that a taper shape may be formed on the cutting portion W side at the time of cutting.

  As described above, according to the corrugated tube 1 of the present embodiment, since the relationship of A> B> 2C described above is satisfied, the wire insertion work is easy, and the holding force when closed is increased. In addition, the overlapping portion does not become too large, and it is easy to fit each other. That is, it is excellent in the insertion workability of the electric wire, the operation of closing the opening is easy, and the holding force when closed can be sufficiently secured.

  Further, a tapered portion 33 is formed on the outer surface side of the end portion of the extending portion 27 of the inner member 3, and a tapered portion 31 is formed on the inner surface side of the end portion of the extending portion 23 of the outer member 5. For this reason, when overlapping each other, the ends of the inner member 3 can be guided to the inside of the outer member 5 by sliding the ends. Therefore, the operation | work which closes the corrugated pipe | tube 1 is easy.

  Further, when the extending portions 23 and 27 of the inner member 3 and the outer member 5 are fitted, the crests and the troughs of the inner member 3 and the outer member 5 are fitted, so that the closed state is maintained. You can increase your power.

  In particular, when fitting the crests 13 and troughs 15 of the inner member 3 to the crests 9 and troughs 11 of the outer member 5, if they are press-fitted and expanded while expanding the mutual opening width, The holding force in the closed state can be increased.

(Second Embodiment)
Next, a second embodiment will be described. FIG. 10 is a bottom view of the corrugated tube 1a (viewed from the hinge portion 7 side). In the following description, components having the same functions as those of the corrugated tube 1 are denoted by the same reference numerals as those in FIGS. 1 to 7 and the like, and redundant description is omitted.

  The corrugated tube 1a has substantially the same configuration as the corrugated tube 1, but differs in that a slit 35 is provided in the hinge portion 7. In the corrugated tube 1, the hinge portion 7 has no peaks and valleys. For this reason, when the corrugated tube 1 is bent, the hinge portion 7 is inferior in flexibility as compared with the inner member 3 and the outer member 5. For this reason, there exists a possibility that sufficient flexibility cannot be obtained as the corrugated pipe 1 whole.

  In the corrugated pipe 1a, the slit 35 is formed toward the formation direction (circumferential direction) of the peaks and valleys. The slits 35 are formed in a plurality of cycles at the same interval as the peaks or valleys with respect to the tube axis direction. For example, the slit 35 is formed in accordance with the positions of the valley portions of the inner member 3 and the outer member 5.

  Thus, by forming the slits 35 in the hinge portion 7 at a predetermined interval, the slits 35 can be deformed when the corrugated tube 1a is bent. For this reason, the flexibility at the time of bending to the pipe-axis direction of the hinge part 7 improves.

  Note that the arrangement and shape of the slits 35 are not limited to the illustrated example, and may be other forms as long as they can follow bending deformation in the tube axis direction. For example, the formation interval of the slits 35 may be changed from the interval between the crests or troughs, and may be formed not at the troughs but at the crests. Further, instead of the slit 35, a simple cut may be used. By forming the slit 35, not only the bending deformation in the tube axis direction but also when the hinge portion 7 is bent and deformed, the rigidity of the hinge portion is reduced, so that the inner member can be easily fitted to the outer member. Become.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Further, by forming the slit 35 in the hinge portion 7, the flexibility of the hinge portion 7 can be enhanced. For this reason, the flexibility of the corrugated pipe 1a can be improved.

(Third embodiment)
Next, a third embodiment will be described. FIG. 11A is a bottom view of the corrugated tube 1b (viewed from the hinge portion 7 side). The corrugated tube 1b has substantially the same configuration as that of the corrugated tube 1, but is different in that an uneven portion 37 is provided on the hinge portion 7.

  FIG.11 (b) is the PP sectional view taken on the O section of Fig.11 (a). As shown in the figure, the hinge portion 7 is provided with an uneven portion 37. The concavo-convex portion 37 is composed of a plurality of concave portions and convex portions. In addition, the uneven part 37 is formed on both surfaces of the hinge part 7. That is, it is desirable that the thickness of the hinge portion 7 is substantially constant, and the cross section of the hinge portion 7 has a waveform.

  Thus, by forming the uneven part 37 in the hinge part 7, the flexibility of the hinge part 7 is improved by the deformation of the uneven part 37 when the corrugated tube 1 b is bent.

  In addition, the uneven | corrugated | grooved part 37 does not necessarily need to be provided with a recessed part and a convex part, and only a recessed part or only a convex part may be sufficient as it. In the illustrated example, a plurality of concave portions and convex portions are formed repeatedly in the tube axis direction and the circumferential direction of the tube, but the size, position, and shape of the concave portions and convex portions are limited to the illustrated example. I can't.

  According to the third embodiment, an effect similar to that of the first embodiment can be obtained. Further, by forming the concave and convex portion 37 in the hinge portion 7, it is possible to increase flexibility when the hinge portion 7 is bent in the tube axis direction. For this reason, the flexibility of the corrugated pipe 1b can be improved.

(Fourth embodiment)
Next, a fourth embodiment will be described. FIG. 12A is a front view of the corrugated tube 1c. The corrugated tube 1c has substantially the same configuration as the corrugated tube 1, but differs in that the hinge portion 7a is formed of a plurality of corrugated portions.

  FIG.12 (b) is an expanded sectional view of the hinge part 7a of the corrugated pipe 1c. The hinge portion 7 has a single wave shape, whereas the hinge portion 7a has a plurality of (two in the figure) wave shapes. A convex portion 39 is provided on one adjacent corrugated portion. Further, a concave portion 41 is provided in the other adjacent wave shape portion. The convex portion 39 and the concave portion 41 are disposed at portions facing each other.

  Further, the convex portion 39 fits into the concave portion 41. That is, the convex portion 39 and the concave portion 41 become a fitting portion that can be fitted to each other. The adjacent corrugated parts can be fitted to each other by the fitting part.

  As shown in FIG. 12A, when the corrugated tube 1 c is completely released, the adjacent corrugated portions of the hinge portion 7 a are fitted to each other by the convex portion 39 and the concave portion 41. That is, the adjacent corrugated portions of the hinge portion 7a are fitted together, and the shape of the hinge portion is maintained in a state where the side walls forming the corrugated portion are closed (in contact with each other).

  In this way, the corrugated tube 1c can be maintained in a completely open state by being maintained in a state where the corrugated portions are in contact with each other. That is, the inner member 3 and the outer member 5 can be maintained in a completely opened state before the electric wire is inserted. Thus, since an open state can be maintained, the insertion operation of an electric wire is easy.

  FIG. 13A is a front view showing a state in which the corrugated tube 1c starts to be closed, and FIG. 13B is an enlarged cross-sectional view of the hinge portion 7a of the corrugated tube 1c at this time. When the inner member 3 and the outer member 5 start to close, the fitting of the convex portions 39 and the concave portions 41 between the corrugated portions of the hinge portion 7a is released. Therefore, the waveform portions are separated from each other and deformed so as to open each other. For this reason, the fitting structure of the hinge part 7a has no influence on the operation | work which closes the corrugated pipe 1c.

  According to the fourth embodiment, an effect similar to that of the first embodiment can be obtained. Moreover, since the hinge part 7a is comprised by several wave shape parts and the fitting part which can fit adjacent wave shape parts is formed, it is easy to maintain the state where the corrugated pipe 1c was opened. For this reason, the insertion workability of the electric wire is excellent. Further, when the corrugated pipe 1c is closed, the fitting state is released, so that the corrugated pipe 1c can be easily closed.

(Fifth embodiment)
Next, a fifth embodiment will be described. FIG. 14 is a plan view of the corrugated tube 1d. The corrugated tube 1d has substantially the same configuration as that of the corrugated tube 1, but is different in that a fitting portion 43 is provided in the overlapping portion of the inner member 3 and the outer member 5.

  FIG. 15A is a cross-sectional view taken along the line QQ in FIG. 14, and FIG. 15B is an enlarged view of a portion R in FIG. 15A. A protrusion 45 is provided on the outer surface of the extending portion 27 of the inner member 3. Further, a hole 47 is provided in the extending portion 27 of the outer member 5. The protrusion 45 and the hole 47 can be fitted.

  When the corrugated tube 1d is completely closed, the position of the protrusion 45 provided in the extending portion 27 of the inner member 3 and the position of the hole 47 provided in the extending portion 27 of the outer member 5 coincide. Accordingly, the protrusion 45 is fitted into the hole 47. For this reason, the state which the inner side member 3 and the outer side member 5 closed can be hold | maintained more stably.

  In addition, the aspect of the fitting part 43 is not restricted to the example shown in figure, The hole 47 and the protrusion 45 may not be sufficient. Alternatively, the hole 47 may be provided in the extended portion 27 of the inner member 3, and the protrusion 45 may be provided on the inner surface of the extended portion 27 of the outer member 5.

  According to the fifth embodiment, an effect similar to that of the first embodiment can be obtained. Further, by providing the extending portions 23 and 27 with the fitting portions 43 that can be fitted to each other, the corrugated pipe 1d can be held in a closed state.

(Sixth embodiment)
Next, a sixth embodiment will be described. FIG. 16 is a front view of the corrugated pipe 1e in an opened state as seen from the pipe axis direction. The corrugated tube 1e has substantially the same configuration as that of the corrugated tube 1, but the inner member 3 and the outer member 5 are different from the shape of the hinge portion 7.

  The hinge portion 7 of the corrugated tube 1a is not in the shape of the corrugated shape as described above, but is a point shape, and the cross-sectional shape of the corrugated tube 1a is a thin wall in which the end portion of the inner member 3 and the end portion of the outer member 5 are pointed. The shape is such that it is directly joined via the part. Thus, in the present invention, a portion that can be bent because the inner member 3 and the outer member 5 open and close each other is defined as a hinge portion. The hinge portion 7 may have any shape as long as the inner member 3 and the outer member 5 can perform a flattening operation.

  In the inner member 3, a straight portion 26 is formed between the hinge portion 7 and the curved portion 17. Thus, in this invention, the hinge part 7 and the curve part 17 do not need to be joined directly, and both the inner member 3 and the outer member 5 should just comprise a curve part and a linear part.

  The corrugated pipe 1e also has a curvature radius C of the curved portion 17 of the inner member 3, a curvature radius D of the curved portion 18 of the outer member 5, and a curvature radius E of the curved portion 21 as in the corrugated pipe 1. The curvature radii C, D, and E of the curved portions are preferably substantially the same.

In addition, with respect to the corrugated pipe 1e, the opening dimension (A in the drawing) between the end portion of the extending portion 27 of the inner member and the hinge portion 7 is set to the outer side before the inner member 3 and the outer member 5 are closed. It is larger than the opening dimension (B in the drawing) between the end of the extended portion 23 (curved portion 21) of the member 5 and the hinge portion 7. Moreover, the opening dimension (E in the figure) between the extended portion 23 end of the outer member 5 and the hinge part 7 is larger than twice the radius of curvature (C in the figure) of the curved portion 17 of the inner member 3. That is,
A>B> 2C
Satisfy the relationship.

  By doing in this way, as above-mentioned, when a pipe | tube is closed, a mutual overlapping part can be fitted reliably, and the shape of an obstruction pipe | tube can be made into a flat tube shape.

  According to the sixth embodiment, the same effects as those of the first embodiment can be obtained. In addition, by forming the straight portion 26 between the hinge portion 7 and the curved portion 17, it is possible to improve the storage property of the cable inside the corrugated tube and the attachability of the corrugated tube, and sandwich the hinge portion 7. Compared with the case where the curved portions of the inner member 3 and the outer member 5 are directly opposed to each other, the bending stress generated when the extending portion is overlapped and the tube is closed is not limited to the hinge portion 7 but the boundary between the straight portion and the curved portion. Since the bending stress applied to the hinge portion 7 can be reduced, the closed state of the tube can be stably maintained.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, it goes without saying that the above-described configurations can be combined with each other.

1, 1a, 1b, 1c, 1d, 1e ......... corrugated tube 3 ......... inner member 5 ......... outer member 7, 7a ......... hinge portion 9, 13 ......... mountain portion 11, 15 ......... Valley portions 17, 18, 21 ......... Curve portions 19, 25, 26 ......... Line portions 23, 27 ......... Extension portions 29 ......... Wires 31, 33 ......... Taper portions 35 ......... Slits 37 ......... Concave and convex part 39 ... ... Convex part 41 ... ... Concave part 43 ... ... Fitting part 45 ... ... Protrusion 47 ... ... Hole 50 ... ... Pipe material manufacturing device 51 ... ... Mold 53a, 53b ……… Endless track 55 ………… Extruder 57 ……… Cylindrical material 59 ……… Molding part 61 ………… Corrugated pipe material 63 ……… Connecting part

Claims (17)

An inner member;
An outer member;
A hinge part that opens or bends when the inner member and the outer member are fitted, and
Comprising
In the inner member, a plurality of crests and troughs extending in the circumferential direction are alternately formed at predetermined intervals in the tube axis direction,
In the tube vertical cross section of the inner member, an extending portion is formed on the tube opening side, and the inner member includes a curved portion and a straight portion,
In the outer member, a plurality of crests and troughs extending in the circumferential direction are alternately formed at predetermined intervals in the tube axis direction,
In the tube vertical cross section of the outer member, an extending portion is formed on the tube opening side, and the outer member includes a curved portion and a straight portion,
When the extending portions of the inner member and the outer member are overlapped, the cross section becomes a closed tube,
Further, in a state where the extended portions of the inner member and the outer member are not fitted to each other, in the tube vertical cross section, between the end of the extended portion of the inner member and the hinge portion An opening dimension is larger than an opening dimension between the end part of the extending part of the outer member and the hinge part, and an opening dimension between the end part of the extending part of the outer member and the hinge part. Is larger than twice the radius of curvature of the curved portion of the inner member.   Each of the inner member and the outer member includes a curved portion between the hinge portion and the extending portion in a tube vertical cross section, and the extending portion includes a straight portion. The corrugated pipe according to claim 1.   3. The inner member and the outer member, wherein one end portion of each of the curved portions is connected to the hinge portion, and the other end portion is connected to the extending portion. Corrugated tube.   At least one of one end portions of the curved portions of the inner member and the outer member is connected to the hinge portion via a straight portion, and the other end portion is connected to the extending portion. The corrugated pipe according to claim 2.   The curvature radius of each curved part of the inner member and the outer member is the same, the extending part of the inner member is constituted by a straight part, and the extending part of the outer member is constituted by a straight part and a curved part. The corrugated pipe according to claim 1, wherein the corrugated pipe is provided. A taper portion is formed on the outer surface side at the end of the extended portion of the inner member,
A taper portion is formed on the inner surface side at the end of the extended portion of the outer member,
When the extended portions of the inner member and the outer member are fitted to each other, the tapered portion of the extended portion of the inner member is fitted to face the tapered portion of the extended portion of the outer member. The corrugated pipe according to any one of claims 1 to 5, wherein the corrugated pipe is provided.   The corrugated pipe according to any one of claims 1 to 6, wherein a plurality of cuts or slits are formed in the hinge portion in accordance with a formation interval of a peak portion or a valley portion.   The corrugated pipe according to any one of claims 1 to 7, wherein a plurality of irregularities or protrusions are formed on the hinge portion.   The corrugated tube according to any one of claims 1 to 8, wherein the hinge portion is configured by one or a plurality of corrugated portions in a vertical section of the tube. The hinge portion is composed of a plurality of wave-shaped portions in a tube vertical cross section,
The adjacent corrugated portions are formed with fitting portions that can be fitted to each other,
In a state before fitting the inner member and the outer member, it is possible to stably maintain a state in which the corrugated tube is opened by fitting the fitting portions of the adjacent corrugated portions. The corrugated pipe according to claim 9.   When the extended portions of the inner member and the outer member are fitted to each other, at least a part thereof has a structure in which the ridges and valleys of the inner member and the outer member are fitted. The corrugated pipe according to any one of claims 1 to 10. A fitting protrusion is provided on one of the overlapping portions of the inner member and the outer member, and a fitting hole is provided on the other.
The fitting protrusion and the fitting hole are fitted to each other when the extending portions of the inner member and the outer member are fitted to each other. Corrugated tube as described in. The opening width of the outer surface of the valley portion of the inner member is smaller than the maximum width of the protrusion on the inner surface of the valley portion of the outer member, and the maximum width of the outer surface of the mountain portion of the inner member is the inner surface of the mountain portion of the outer member. Formed larger than the opening width of
The ridges and valleys are press-fitted and fitted while the opening width is expanded when the ridges and valleys of the inner member and the outer member are fitted together. The corrugated pipe according to any one of claims 1 to 12.   The cable structure characterized by arrange | positioning an electric wire inside the corrugated pipe in any one of Claims 1-13. A method of manufacturing a corrugated pipe that can be opened and closed,
An inner member and an outer member each having at least a curved portion and an extending portion; a hinge portion connecting one end of each of the inner member and the outer member; and substantially facing the hinge portion; Forming a corrugated pipe material having a connecting portion for connecting ends of the extended portion, which is the other end of each of the outer members,
The connection portion is cut, and at this time, an opening dimension between the end portion of the extension portion of the inner member and the hinge portion is set to be equal to the end portion of the extension portion of the outer member and the hinge portion. The opening dimension between the end of the extended portion of the outer member and the hinge portion is larger than twice the radius of curvature of the curved portion of the inner member. A manufacturing method of a corrugated pipe characterized by the above. When the connection portion of the corrugated tube material is cut, a tapered portion is formed on the outer surface side at the opening end portion of the inner member, and a tapered portion is formed on the inner surface side at the opening end portion of the outer member. ,
After the connection portion is cut, when the extension portions of the inner member and the outer member are fitted to each other, the taper portion of the end portion of the extension portion of the inner member is changed to the extension portion of the outer member. The corrugated tube manufacturing method according to claim 15, wherein the corrugated tube can be slid and fitted to face the tapered portion. A method of manufacturing a corrugated tube material,
The corrugated tube material includes an inner member and an outer member each having at least a curved portion and an extending portion, a hinge portion connecting one end portion of each of the inner member and the outer member, and the hinge portion. A connecting portion that connects the end portions of the extending portion, which is the other end portion of each of the inner member and the outer member, and has an asymmetrical cross-section that is asymmetrical across the hinge portion,
When the maximum diameter of the ellipse of the corrugated tube material is the major axis, the major axis is divided into two equal parts through the hinge portion and a straight line perpendicular to the major axis is the minor axis, the minor axis is a mold. As a dividing line, a plurality of a pair of molds formed so as to include either the inner member or the outer member with respect to the dividing line are connected in a loop shape, and one part on each loop is connected. The pair of molds face each other,
A resin tube is supplied by extrusion molding into a pair of the molds that are combined to face each other, and the mold is repeatedly transferred and supplied while the transfer speed of the mold is synchronized with the extrusion speed of the resin pipe. In addition, the corrugated tube material manufacturing method is characterized in that the resin tube is sucked into the mold and formed into a shape matched to the mold shape.

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