JP5924206B2 - Pipe covering layer folding jig - Google Patents

Description

  The present invention relates to a pipe covering layer turning jig for turning a covering layer in advance when connecting a pipe having a covering layer to a pipe connecting joint in a water supply system or a hot water supply system, for example.

  As a pipe for water supply or hot water supply, one having a coating layer on the outer peripheral surface of the pipe is known. This coating layer has a function of suppressing damage to the pipe and suppressing vibration and impact sound due to the water hammer phenomenon. When a pipe having such a coating layer is connected to a joint, the coating layer must be cut off at the end of the pipe or folded back.

  Various inventions for removing such a coating layer at the end of the pipe have been proposed. For example, Patent Document 1 discloses a piping method for a water supply / hot water supply pipe. That is, in the piping method, a peelable buffer layer is laminated on the outer periphery of the pipe, and a large number of protrusions extending in the longitudinal direction of the pipe are integrally formed on the buffer layer. It is something that strikes the layer.

  Patent Document 2 discloses a coating material peeling tool. This covering material peeling tool is provided with a cutting edge on a rotating main body and an extruding part for extruding the covering material peeled off by the cutting edge toward the outside of the main body.

JP 2000-303516 A JP-A-9-192901

  However, in the conventional water supply / hot water pipe arrangement method described in Patent Document 1, the buffer layer covering the outer periphery of the pipe has a certain thickness and strength, and the pipe is tightened from the periphery. There is a problem that it is not easy to fold the entire buffer layer by putting a finger on the ridge at the end of the ridge.

  On the other hand, the conventional coating material peeling tool shown in Patent Document 2 cuts off the coating material using a cutting blade extending in an oblique direction with respect to its axis, and the stripped coating material is removed at the extrusion section. It extrudes to the outside of the main body. For this reason, the covering material is cut off in an oblique direction with respect to the axis of the tool, and when the end of the tube is attached to the joint, there is a portion where the covering material is not formed on the outer periphery of the tube.

  Furthermore, with this covering material peeling tool, there is a possibility that the covering material cannot be sufficiently cut off when the cutting with the cutting blade is shallow, or the pipe may be damaged when the cutting with the cutting blade is deep. Therefore, this covering material peeling tool has a problem that it is not suitable as a tool for peeling the covering material in order to connect the end portion of the pipe having the covering material to the joint.

  Therefore, an object of the present invention is to provide a pipe covering layer folding jig that can fold the coating layer at the end of the pipe very easily and can quickly and smoothly connect the pipe to the joint. It is to provide.

  In order to achieve the above object, the pipe covering layer folding jig according to claim 1 is a jig for folding the coating layer covering the outer peripheral surface of the pipe at the end of the pipe, A cylindrical inner cylinder portion inserted between the pipe and the coating layer, and a cylindrical outer cylinder surrounding the coating layer at the end of the pipe with the inner cylinder portion inserted between the pipe and the coating layer A cylindrical portion is integrally formed, and a plurality of main guide ribs are installed between the inner peripheral portion of the outer cylindrical portion and the outer peripheral portion of the inner cylindrical portion, and the main guide ribs are assisted between the main guide ribs. By providing a sub-guide rib and providing an arcuate portion for turning back to guide the folding of the coating layer on the inner peripheral portion of the main guide rib, inserting the inner cylinder portion between the pipe and the coating layer, and pushing in while rotating Fold the cover layer with the sub guide ribs Characterized by being configured to wrap arc-shaped portion for to.

  The pipe covering layer folding jig according to claim 2 is the invention according to claim 1, wherein the folding arcuate portion of the main guide rib is inserted into the inner end portion of the inner peripheral portion of the main guide rib. It is characterized by being cut out in a circular arc shape from the side end.

  The pipe covering layer folding jig according to claim 3 is the invention according to claim 1 or 2, wherein each of the main guide rib and the sub guide rib has an inner cylinder side on an outer cylinder side with respect to a radial direction. Inclinedly arranged so as to be positioned in the traveling direction of the rotation direction, the inclination angle is 20 to 40 degrees with respect to the radial direction.

  The pipe covering layer folding jig according to claim 4 is the invention according to any one of claims 1 to 3, wherein 5 to 7 main guide ribs are provided at equal intervals in the circumferential direction. The sub guide rib is provided at a central position between the main guide ribs.

  The pipe covering layer folding jig according to claim 5 is the invention according to any one of claims 1 to 4, wherein the sub guide rib is formed to be lower and narrower than the main guide rib. It is characterized by being.

  The pipe covering layer folding jig according to a sixth aspect of the present invention is the invention according to any one of the first to fifth aspects, wherein the inner end portion of the sub guide rib is notched and the sub notch is formed. And a sub arc portion for folding is provided on the outer peripheral side of the sub cutout to assist the folding of the coating layer.

  The pipe covering layer folding jig according to a seventh aspect of the present invention is the invention according to any one of the first to sixth aspects, wherein the outer peripheral surface of the inner cylinder portion is inserted from the inner back to the insertion side. It is formed in a taper shape so that it may reduce in diameter toward an end part.

  The pipe covering layer folding jig according to an eighth aspect of the present invention is the invention according to any one of the first to seventh aspects, wherein the jig is non-rotatably mounted in the cylindrical portion of the handle, and the main guide rib and sub The guide rib is configured so that at least the inner peripheral side can be viewed from the outer end side of the handle.

According to the present invention, the following effects can be exhibited.
In the pipe covering layer folding jig according to the present invention, the inner cylinder part inserted between the pipe and the coating layer and the outer cylinder part surrounding the coating layer are integrally formed, and the outer cylinder part and the inner cylinder A plurality of main guide ribs are provided between the main guide ribs, and sub guide ribs are provided between the main guide ribs. Further, an arcuate portion for folding is provided on the inner peripheral portion of the main guide rib.

  And, when the coating layer at the pipe end is folded using this folding jig, the inner cylinder is inserted between the pipe and the coating layer, and is pushed in while rotating so that the coating layer at the pipe end is Is reversed while moving along the arcuate portion for folding the main guide rib. At this time, the coating layer positioned between the main guide ribs moves in the folding direction while being guided along the sub guide ribs. For this reason, the coating layer at the end of the pipe is guided by the main guide ribs and folded back, and the coating layer between the main guide ribs is guided and folded by the sub guide ribs. That is, the coating layer at the end of the pipe can be easily folded by the cooperative action of the main guide rib and the sub guide rib of the folding jig. Therefore, the portion where the coating layer is folded and the pipe is exposed can be inserted into the joint and connected.

  Therefore, according to the pipe coating layer folding jig of the present invention, the coating layer at the end of the pipe can be folded very easily, and the connection of the pipe to the joint can be performed quickly and smoothly. Play.

The perspective view which shows the state which made the folding jig | tool in the embodiment of this invention oppose the edge part of the resin pipe. (A) is the front view which shows the jig | tool for folding, (b) is sectional drawing which shows the jig for folding. (A) is an expanded sectional view which shows the main guide rib of the jig | tool for folding, (b) is an expanded sectional view which shows the sub guide rib of the jig for folding. The front view which shows the resin pipe which has a coating layer in an outer peripheral part. The perspective view which shows the handle | steering-wheel of the jig | tool for a return | turnback. The rear view of a handle | steering-wheel which shows the relationship between the 1st cylinder part of a handle | steering-wheel, the inner cylinder part of the jig | tool for folding | turning, a resin pipe, and its coating layer. Sectional drawing which shows the state which fitted the jig | tool for folding | fitting in the 2nd cylinder part of a handle | steering-wheel. It is a figure which shows the effect | action of a folding jig | tool, Comprising: (a) is a perspective view which shows the state which inserted the inner cylinder part of the folding jig | tool between a pipe and a coating layer, (b) shows the state. Sectional drawing. FIG. 9 is an operation diagram following FIG. 8, in which (a) is a perspective view showing a state in which a coating layer is folded back by a main guide rib, and (b) is a cross-sectional view showing the state. FIG. 10 is an operation diagram following FIG. 9, in which (a) is a perspective view showing a state in which a coating layer is folded back by a main guide rib and guided by a sub guide rib, and (b) is a cross-sectional view showing the state. FIG. 11 is an operation diagram subsequent to FIG. 10, in which (a) is a perspective view showing a state in which the coating layer is folded and stacked on the coating layer of the resin pipe, and (b) is a cross-sectional view showing the state. It is a figure which shows the effect | action which attaches the resin pipe by which the coating layer was folded back to a coupling, (a) is sectional drawing which shows the state which made the edge part of the resin pipe oppose the insertion space of a coupling, (b) Is a sectional view showing a state in which the resin pipe is inserted into the joint, and (c) is a sectional view showing a state in which the insertion of the resin pipe into the joint is completed. (A) is a front view which shows the jig | tool for folding of another example of this invention, (b) is sectional drawing which shows the jig | tool for folding.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail based on FIGS.
As shown in FIG. 1, the folding jig 10 of this embodiment is a jig for folding a coating layer 12 covering the outer peripheral surface of a cylindrical resin pipe 11 at the end of the resin pipe 11. As shown in FIG. 4, a large number of protrusions 12 a extending in the longitudinal direction of the resin pipe 11 are formed at regular intervals in the circumferential direction on the inner peripheral surface of the covering layer 12. The resin pipe 11 is formed of a polyolefin resin such as a crosslinked polyethylene resin or a polybutene resin, and the coating layer 12 is formed of a thermoplastic elastomer such as an olefin thermoplastic elastomer.

  As shown in FIGS. 2A and 2B, the folding jig 10 includes a cylindrical inner cylinder portion 13 inserted between the resin pipe 11 and the coating layer 12, and the inner cylinder portion 13. Is integrally formed with a cylindrical outer cylinder portion 14 surrounding the coating layer 12 at the end of the resin pipe 11 in a state where the is inserted between the resin pipe 11 and the coating layer 12. The outer peripheral surface of the inner cylinder portion 13 is a tapered surface 13a that is reduced in diameter toward the insertion side end portion, and the inner cylinder portion 13 can be easily inserted between the resin pipe 11 and the coating layer 12. The diameter gradually increases. Three chamfered portions 14 a are provided on the outer peripheral surface of the outer cylindrical portion 14 at intervals of 120 ° in the circumferential direction. The folding jig 10 is made of a synthetic resin such as acrylic resin, polypropylene (PP) resin, polyethylene (PE) resin, polyacetal (POM) resin, or a metal such as copper alloy or aluminum.

  Between the inner peripheral part of the outer cylinder part 14 and the outer peripheral part of the inner cylinder part 13, a plurality (six in this embodiment) of main guide ribs 15 are installed at regular intervals in the circumferential direction. . The main guide rib 15 performs a function of guiding and folding back the coating layer 12 at the end of the resin pipe 11.

  As for this main guide rib 15, it is desirable to provide 5-7 pieces (six in this embodiment) at equal intervals in the peripheral direction. When the number of the main guide ribs 15 is less than 5, the force for guiding the entire circumference of the coating layer 12 to be folded back is not preferable. On the other hand, when the number of the main guide ribs 15 exceeds seven, the engagement force in the circumferential direction between the main guide ribs 15 and the coating layer 12 tends to be strong, and it is difficult to continue the folding of the coating layer 12. It is not preferable.

  A sub guide rib 16 that is lower than the main guide rib 15 and narrower than the main guide rib 15 is installed between the outer cylinder portion 14 and the inner cylinder portion 13 at the center position in the circumferential direction between the main guide ribs 15. The sub guide rib 16 assists the function of the main guide rib 15 and functions to fold the coating layer 12 at the end of the resin pipe 11 between the main guide ribs 15.

  Further, as shown in FIG. 2A, the main guide rib 15 and the sub guide rib 16 have the inner cylinder portion 13 side folded back more than the outer cylinder portion 14 side with respect to the radial direction of the inner cylinder portion 13 or the outer cylinder portion 14, respectively. The jig 10 is inclined so as to be positioned in the traveling direction of the rotation direction [counterclockwise in FIG. 2A]. The inclination angle α of the main guide rib 15 and the inclination angle β of the sub guide rib 16 are desirably 20 to 40 ° with respect to the radial direction. When these inclination angles α and β are less than 20 °, the sliding contact force of the main guide rib 15 or the sub guide rib 16 with respect to the coating layer 12 tends to be strong, and wrinkles are formed in the coating layer 12 so that the coating layer 12 It is not preferable because it is difficult to perform the folding smoothly. On the other hand, when the inclination angles α and β exceed 40 °, the sliding contact force of the main guide rib 15 or the sub guide rib 16 with respect to the coating layer 12 is reduced, and it is difficult to continuously fold the coating layer 12. Absent.

  The inclination angle α of the main guide rib 15 is more preferably 25 to 35 °, and the inclination angle β of the sub guide rib 16 is further preferably 30 to 40 °. That is, it is desirable to set the inclination angle β of the sub guide rib 16 to be larger than the inclination angle α of the main guide rib 15 in order to appropriately exhibit the functions of the sub guide rib 16 and the main guide rib 15. In the present embodiment, the inclination angle α of the main guide rib 15 is set to 30 °, and the inclination angle β of the sub guide rib 16 is set to 35 °.

  As shown in FIGS. 2A, 2 </ b> B, and 3 </ b> A, a folding arc-like portion 17 that guides the folding of the coating layer 12 is formed on the inner peripheral portion of the main guide rib 15. The folding arc-shaped portion 17 is formed by cutting out the inner end side of the inner peripheral portion of the main guide rib 15 from the insertion side end portion of the inner cylinder portion 13 in a circular arc shape. The size of the arc of the folding arc-shaped portion 17 is set in consideration of the thickness, material, and the like of the coating layer 12 of the resin pipe 11. In this case, the inner circumferential side of the folding arcuate portion 17 is formed along the tapered surface 13 a of the inner cylinder portion 13, that is, the tapered surface 13 a extends in a substantially tangential direction of the folding arcuate portion 17. A chamfered surface 17 a having an arcuate cross section is formed at the opening end of the folding arcuate portion 17 so that the covering layer 12 can be smoothly guided to the folding arcuate portion 17. 3A, the inner cylinder portion 13 is inserted between the resin pipe 11 and the coating layer 12 and pushed in while rotating, so that the coating peeled off from the resin pipe 11 is obtained. The layer 12 is moved along the folding arcuate portion 17 and folded.

  Further, as shown in FIG. 3B, the sub guide rib 16 has an inner end cut away to form a sub cutout 18, and an outer periphery of the sub cutout 18 has a coating layer 12. A folding sub-arc-shaped portion 19 having a circular arc cross section for assisting folding is provided. 3B, the covering layer 12 between the main guide ribs 15 peeled off from the resin pipe 11 extends from the sub notch portion 18 of the sub guide rib 16 along the sub arcuate portion 19 for folding. It is configured to move and wrap.

  As shown in FIG. 5, the handle 20 for facilitating the operation of the folding jig 10 is formed in a substantially bottomed hexagonal cylinder shape by synthetic resin such as ABS resin, and the axis of the handle 20 is at the center thereof. A cylindrical first tube portion 21 extending in the direction is provided. A cylindrical second tube portion 22 is formed concentrically on the outer periphery of the first tube portion 21 so as to extend longer than the first tube portion 21 toward the inner end side at a predetermined interval. Three cut surfaces 22 a are formed on the inner peripheral surface of the second cylindrical portion 22 at intervals of 120 degrees in the circumferential direction.

  Then, as shown in FIG. 7, the folding jig 10 is fitted inside the second cylindrical portion 22, and the back surface of the jig 10 is positioned against the inner end surface of the first cylindrical portion 21. As shown in FIG. 8A, when the folding jig 10 is fitted into the second cylindrical portion 22, the three chamfered portions 14 a of the folding jig 10 are three cut surfaces of the second cylindrical portion 22. 22a is engaged, and the rotation of the folding jig 10 is restricted.

  As shown in FIG. 6, the first tube portion 21 of the handle 20 is formed larger than the inner tube portion 13 of the folding jig 10. Then, as shown by a two-dot chain line in FIG. 6, the inner cylinder portion 13 of the folding jig 10 is inserted between the resin pipe 11 and the coating layer 12, and the state in which the coating layer 12 is folded is removed from the handle 20. It is visible from the end side (back side).

  As shown in FIG. 5, through holes 23 for inserting screws are provided in the outer peripheral portion of the outer cylinder portion 14 at intervals of 120 ° in the circumferential direction. As shown in FIG. 7, a screw 24 is inserted into the through-hole 23 from the inner end side of the outer cylinder portion 14 through a washer 25 and screwed into a nut 26 to be fastened and fixed. In this case, the inner peripheral side of the washer 25 engages with the inner end surface of the outer cylinder part 14 of the folding jig 10 mounted in the second cylinder part 22 of the handle 20, and moves in the axial direction of the folding jig 10. It is comprised so that movement of may be controlled.

  As shown in FIG. 5, a plurality of finger hanging recesses 28 are provided on the outer peripheral surface of the peripheral wall 27 of the handle 20, and the turning operation of the folding jig 10 is facilitated by hooking the fingers on the finger hanging recesses 28. . Note that a plurality of reinforcing ribs 29 extending in a radial manner are provided between the first tube portion 21 and the second tube portion 22 and between the second tube portion 22 and the peripheral wall 27.

Here, the joint 30 into which the end portion of the resin pipe 11 exposed by folding back the coating layer 12 will be briefly described.
As shown in FIG. 12 (a), the joint 30 is configured by a cylindrical joint body 31 for connecting the resin pipe 11 provided in three directions. The joint body 31 is made of a synthetic resin such as polyphenylene sulfide resin (PPS). Since each joint main body 31 is the same structure, the one joint main body 31 is demonstrated.

  An inner cylinder 33 and an outer cylinder 34 for forming the insertion space 32 of the resin pipe 11 are formed on the joint body 31 so as to protrude from the inner periphery and the outer periphery. A spacer 35 is disposed in the outer cylinder 34, and a seal ring 36 is fitted on the outer peripheral surface of the inner cylinder 33. The inner space of the inner cylinder 33 is a flow path 37 through which a fluid such as water flows. A lid 38 is fitted to the outer peripheral surface of the outer cylinder 34.

  A retaining mechanism 39 for retaining the resin pipe 11 inserted into the insertion space 32 is provided between the outer cylinder 34 and the lid 38. A retaining ring 40 constituting the retaining mechanism 39 is formed with a plurality of retaining pieces protruding so as to incline toward the inner end side. In the insertion space 32, an insertion guide 41 that is pressed against the distal end surface of the resin pipe 11 and guides insertion of the resin pipe 11 is disposed. A tightening cover 43 is attached to the outer peripheral surface of the lid 38.

Next, the operation of the folding jig 10 configured as described above will be described.
Now, as shown in FIGS. 7 and 8A and 8B, when folding back the coating layer 12 at the end of the resin pipe 11, the folding jig 10 is fitted into the second cylindrical portion 22 of the handle 20, The outer end surface is pressed against the inner end surface of the first tube portion 21. At this time, when the chamfered portion 14 a of the folding jig 10 is engaged with the cut surface 22 a of the second cylindrical portion 22, the relative rotation of the handle 20 with respect to the folding jig 10 is restricted.

  Next, as shown in FIG. 7, the screw 24 is inserted into the through hole 23 of the handle 20 from the inner end side through the washer 25, and is screwed into the nut 26 on the outer end side to be tightened. After tightening, the inner peripheral side of the washer 25 engages with the inner end surface of the outer cylinder portion 14 of the folding jig 10, so that the folding jig 10 is restricted from moving in the axial direction of the handle 20.

  8 (a) and 8 (b), with the folding jig 10 attached to the handle 20, the handle 20 is gripped so that the folding jig 10 faces the end surface of the resin pipe 11, The inner cylinder portion 13 is inserted between the resin pipe 11 and the coating layer 12. At this time, since the outer peripheral surface of the inner cylinder portion 13 of the folding jig 10 is a tapered surface 13a whose diameter decreases from the inner back portion toward the insertion side end portion, the inner cylinder portion 13 is connected to the resin pipe 11. And the cover layer 12 can be easily inserted, and the cover layer 12 can be separated from the resin pipe 11 and gradually expanded.

  9A and 9B, when the folding jig 10 is pressed against the end surface of the resin pipe 11 and rotated while the handle 20 is held, the coating layer 12 is formed on the main guide rib 15. At the same time that the resin pipe 11 is guided along the folding arc-shaped portion 17, the resin pipe 11 is inserted into the inner cylinder portion 13. At this time, the arcuate portion 17 for turning back of the main guide rib 15 is cut out in a circular arc shape from the insertion side end of the inner cylinder portion 13, so that the inner cylinder portion 13 is formed between the resin pipe 11 and the coating layer 12. When inserted, the covering layer 12 immediately advances along the folding arcuate portion 17 and is folded. At the same time, the coating layer 12 positioned on the sub guide rib 16 is guided by the sub cutout 18 and advances.

  As shown in FIGS. 10A and 10B, when the handle 20 is rotated so that the folding jig 10 is further pressed against the end surface of the resin pipe 11, the covering layer 12 becomes the arcuate portion for folding the main guide rib 15. At the same time, the resin pipe 11 is inserted deeply into the inner cylinder portion 13. At this time, the size of the arc of the folding arc-shaped portion 17 is appropriately set with respect to the resin pipe 11 and the coating layer 12, and the main guide rib 15 has an inner peripheral portion positioned in a rotational direction more than the outer peripheral portion. Since it is inclined, the folding operation of the coating layer 12 can be performed smoothly with a small force. At the same time, the coating layer 12 located on the sub guide rib 16 advances from the sub cutout portion 18 toward the folding sub arc portion 19.

  As shown in FIGS. 11A and 11B, when the rotation operation of the handle 20 is continued, the coating layer 12 of the resin pipe 11 is completely folded by the folding arc-shaped portion 17 of the main guide rib 15, and the folded coating layer 12A. The folded covering layer 12A moves so as to overlap the unfolded covering layer 12 on the outer periphery of the resin pipe 11. At the same time, the coating layer 12 moves along the folding-back sub-arc-shaped portion 19 of the sub-guide rib 16 to compensate the folding of the coating layer 12 by the main guide rib 15 while suppressing wrinkles of the coating layer 12, and the entire circumference of the coating layer 12 is Wraps smoothly. In addition, since the main guide ribs 15 and the sub guide ribs 16 of the folding jig 10 are provided at six locations at equal intervals in the circumferential direction, the entire covering layer 12 is folded back evenly. In this way, the main guide rib 15 and the sub guide rib 16 of the folding jig 10 act in cooperation, so that the coating layer 12 of the resin pipe 11 is quickly moved from the end of the resin pipe 11 by a predetermined length. Can be folded.

  In this way, the end portion of the resin pipe 11 is exposed by folding the coating layer 12 by a predetermined length at the end portion of the resin pipe 11. The edge of the folded covering layer 12 </ b> A is formed in a direction perpendicular to the axis of the resin pipe 11. Further, the exposed amount of the end portion of the resin pipe 11 is determined by the insertion length inserted into the joint 30.

  Thereafter, the end of the resin pipe 11 in which the coating layer 12 is folded back by a certain length is connected to the joint 30. That is, as shown in FIG. 12A, the exposed portion of the end portion of the resin pipe 11 is opposed to the insertion space 32 of the joint 30. Subsequently, as shown in FIG. 12B, when the distal end portion of the resin pipe 11 is inserted into the insertion space 32 of the joint 30, the resin pipe 11 passes through the inner space of the lid body 38, and the distal end portion is inserted. Hit the guide 41. As shown in FIG. 12C, when the resin pipe 11 is further inserted into the insertion space 32 of the joint 30, the resin pipe 11 is guided by the insertion guide 41 and reaches the inner back portion of the insertion space 32. At this time, since the exposed amount of the resin pipe 11 is set in advance based on the insertion length into the joint 30, the folded covering layer 12 </ b> A comes into close contact with the outer end surface of the lid body 38 of the joint 30. As described above, in a state where the end portion of the resin pipe 11 is mounted in the insertion space 32 of the joint 30, the resin pipe 11 is retained by the retaining mechanism 39.

The effect obtained by the above embodiment is described collectively below.
(1) In the folding jig 10 of this embodiment, the inner cylinder part 13 and the outer cylinder part 14 are integrally formed, and a plurality of main guide ribs 15 are installed between the outer cylinder part 14 and the inner cylinder part 13. A sub guide rib 16 is provided between the main guide ribs 15. Further, a folding arcuate portion 17 is provided on the inner peripheral portion of the main guide rib 15.

  When the coating layer 12 at the end of the resin pipe 11 is folded, the inner cylinder portion 13 of the folding jig 10 is inserted between the resin pipe 11 and the coating layer 12 and pushed in while rotating. The layer 12 is reversed while moving along the folding arcuate portion 17 of the main guide rib 15. At the same time, the covering layer 12 positioned between the main guide ribs 15 moves in the folding direction while being guided along the sub guide ribs 16. For this reason, the coating layer 12 can be easily folded back by the cooperative action of the main guide rib 15 and the sub guide rib 16. Therefore, the portion where the coating layer 12 is folded and the resin pipe 11 is exposed can be inserted into the joint 30 for easy connection.

Therefore, according to the folding jig 10 of the present embodiment, the coating layer 12 at the end of the resin pipe 11 can be easily and quickly folded with a jig having a simple configuration, and the resin pipe 11 is connected to the joint 30. There is an effect that can be performed smoothly.
(2) The folding arcuate portion 17 of the main guide rib 15 is formed by cutting out the inner end side of the inner peripheral portion of the main guide rib 15 from the insertion side end portion of the inner cylinder portion 13 in a circular arc shape. For this reason, if the inner cylinder part 13 is inserted between the resin pipe 11 and the coating layer 12, the coating layer 12 separated from the resin pipe 11 is immediately guided along the folding arc-shaped part 17 and guided to be folded back. Can do.
(3) The main guide rib 15 and the sub guide rib 16 are disposed so as to be inclined so that the inner cylinder portion 13 side is positioned in the traveling direction in the rotational direction relative to the outer cylinder portion 14 side with respect to the radial direction. β is set to 20 to 40 ° with respect to the radial direction. Therefore, when the inner cylinder portion 13 of the folding jig 10 is inserted between the resin pipe 11 and the covering layer 12 and rotated, the main guide rib 15 and the sub guide rib 16 come into strong contact with the covering layer 12 to generate wrinkles. Therefore, the coating layer 12 can be guided well, and the folding of the coating layer 12 can be effectively advanced.
(4) Five to seven main guide ribs 15 are provided at equal intervals in the circumferential direction, and the sub guide ribs 16 are provided at a central position between the main guide ribs 15. Therefore, the engagement between the main guide rib 15 and the coating layer 12 can be performed at the most appropriate interval in the circumferential direction, and the folding of the coating layer 12 can be continued in a stable state. The covering layer 12 between 15 can be supported appropriately and the folding of the covering layer 12 can be favorably supported.
(5) The sub guide rib 16 is formed lower than the main guide rib 15 and narrower. For this reason, the covering layer 12 positioned between the main guide ribs 15 can be supported and the entire covering layer 12 can be smoothly folded back without hindering the function expression of the main guide rib 15.
(6) The sub-guide rib 16 has an inner end portion cut away to form a sub-cut portion 18, and a folding sub-arc portion 19 is provided on the outer peripheral side of the sub-cut portion 18. Therefore, the coating layer 12 positioned on the sub guide rib 16 can be guided along the sub cutout portion 18 and the folding sub arc portion 19 to be easily folded back.
(7) The outer peripheral surface of the inner cylinder portion 13 is a tapered surface 13a that decreases in diameter from the inner back portion toward the insertion side end portion. Therefore, the inner cylinder portion 13 can be easily inserted between the resin pipe 11 and the coating layer 12, and the coating layer 12 can be separated from the resin pipe 11 and guided to the main guide rib 15 and the sub guide rib 16. .
(8) The folding jig 10 is non-rotatably mounted in the second cylindrical portion 22 of the handle 20 so that the inner peripheral side of the main guide rib 15 and the sub guide rib 16 can be seen from the outer end side of the handle 20. It is configured. For this reason, the folding operation of the coating layer 12 by the folding jig 10 can be performed with a light operating force by grasping the handle 20, and the folding operation can be performed easily and quickly while viewing from the outer end side of the handle 20. Can be done.

In addition, the said embodiment can also be changed and actualized as follows.
As shown in FIGS. 13A and 13B, seven main guide ribs 15 of the folding jig 10 are provided in the circumferential direction, and the sub guide rib 16 is provided at the center position between the main guide ribs 15. May be. In this case, the inclination angle α of the main guide rib 15 is set to 31 °, for example, and the inclination angle β of the sub guide rib 16 is set to 34 °, for example. This folding jig 10 is formed larger than the folding jig 10 of the above-described embodiment, and can be suitably used for folding the coating layer 12 of the resin pipe 11 having a diameter larger than that of the resin pipe 11 of the embodiment. .

The inclination angle α of the main guide rib 15 and the inclination angle β of the sub guide rib 16 may be the same.
The folding-back sub-arc portion 19 of the sub-guide rib 16 may be omitted.

A plurality of the sub guide ribs 16 may be provided between the main guide ribs 15.
The height and width of the main guide rib 15 and the sub guide rib 16 may be appropriately changed according to the thickness and material of the coating layer 12 of the resin pipe 11, the diameter of the resin pipe 11, and the like.

  The inclination direction of the main guide rib 15 and the sub guide rib 16 is set in a direction opposite to that of the embodiment, and the folding jig 10 is rotated in the direction opposite to that of the embodiment to fold the coating layer 12. May be.

As the pipe, in addition to the resin pipe 11, a soft metal pipe such as a copper pipe may be used.
The joint 30 can be configured such that the joint body 31 is two-way, four-way, or the like.

  DESCRIPTION OF SYMBOLS 10 ... Folding jig | tool, 11 ... Resin pipe, 12 ... Covering layer, 13 ... Inner cylinder part, 13a ... Tapered surface, 14 ... Outer cylinder part, 15 ... Main guide rib, 16 ... Sub guide rib, 17 ... Arcing part for folding , Α... Tilt angle, β.

Claims (8)

A jig for folding the coating layer covering the outer peripheral surface of the pipe at the end of the pipe,
A cylindrical inner cylinder portion inserted between the pipe and the coating layer, and a cylindrical outer cylinder surrounding the coating layer at the end of the pipe with the inner cylinder portion inserted between the pipe and the coating layer A cylindrical portion is integrally formed, and a plurality of main guide ribs are installed between the inner peripheral portion of the outer cylindrical portion and the outer peripheral portion of the inner cylindrical portion, and the main guide ribs are assisted between the main guide ribs. By providing a sub-guide rib and providing an arcuate portion for turning back to guide the folding of the coating layer on the inner peripheral portion of the main guide rib, inserting the inner cylinder portion between the pipe and the coating layer, and pushing in while rotating A pipe coating layer folding jig characterized in that the coating layer is configured to be folded at a folding arcuate portion while being assisted by a sub guide rib. 2. The arcuate portion for turning back the main guide rib is formed by cutting out the inner end side of the inner peripheral portion of the main guide rib in a circular arc shape from the insertion side end portion of the inner cylinder portion. Jig for turning the pipe coating layer. The main guide rib and the sub guide rib are inclined so that the inner cylinder part side is positioned in the traveling direction of the rotation direction relative to the outer cylinder part side with respect to the radial direction, and the inclination angle is 20 to 40 with respect to the radial direction. The pipe covering layer folding jig according to claim 1 or 2, wherein the jig is for turning back. 5. The main guide rib is provided in the circumferential direction at 5 to 7 equal intervals, and the sub guide rib is provided at a central position between the main guide ribs. 5. The jig for folding the pipe coating layer as described. The pipe covering layer folding jig according to any one of claims 1 to 4, wherein the sub guide rib is formed to be lower and narrower than the main guide rib. The sub-guide rib is characterized in that an inner end portion thereof is notched to form a sub-notch portion, and a folding-back sub-arc-shaped portion for assisting folding of the coating layer is provided on the outer peripheral side of the sub-cut-out portion. The pipe covering layer folding tool according to any one of claims 1 to 5. The inner cylinder part is formed in a taper shape so that an outer peripheral surface thereof is reduced in diameter from an inner back part toward an insertion side end part, according to any one of claims 1 to 6. The jig for folding the pipe coating layer as described. 8. The structure according to claim 1, wherein the handle is mounted in a non-rotatable manner in a cylindrical portion of the handle so that at least an inner peripheral side of the main guide rib and the sub guide rib can be visually recognized from an outer end side of the handle. The jig for folding back the pipe coating layer according to claim 1.