Marker ring, jig for marking, and pipe cutter

Abstract

To enhance visibility of marking.SOLUTION: A marker ring 20 incudes a resin-made pipe 91, is applicable to a long body 90 inserted to a pipe joint 100, and is configured to be mountable to an outer peripheral surface of the pipe 91.SELECTED DRAWING: Figure 24

Description

[Technical field]

[0001] The present invention relates to a marking, a marking tool, and a pipe cutter. [Background technology]

[0002] Conventionally, when inserting a pipe into a pipe fitting, a marking is made on the outer surface of the pipe at a position a predetermined length away from the tip of the pipe so that the length of the pipe to be inserted into the pipe fitting can be determined.

[0003] Patent Document 1 discloses a marking jig used for marking the outer peripheral surface of a pipe. This jig has a pipe insertion hole and a contact part provided at the bottom of the pipe insertion hole against which the tip of the pipe contacts. The contact part is provided at a position spaced a predetermined length from the open end of the pipe insertion hole.

[0004] The worker holds the jig with one hand and the pipe with the other hand, inserts the tip of the pipe into the pipe insertion hole, and while keeping the tip of the pipe in contact with the contact portion, moves the tip of the marker pen along the open edge of the pipe insertion hole to draw a marking line on the outer circumferential surface of the pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-264044 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the case of a marking line drawn on the outer peripheral surface of a pipe as in the technique described in Patent Document 1, there is room for improvement in terms of visibility. [Means for solving the problem]

[0007] Various aspects of a marking device, a marking tool, and a pipe cutter for solving the above problems will be described below. [Aspect 1] The present invention is applied to a long body having a resin pipe and being inserted into a pipe joint, and is configured to be attached to the outer circumferential surface of the pipe. Marking.

[0008] According to this configuration, the marker attached to the outer circumferential surface of the pipe protrudes radially outward from the outer circumferential surface, thereby improving the visibility of the marking. [Aspect 2] an annular ring body into which the elongated body is inserted; a plurality of lock pieces extending from an inner peripheral edge of the ring body toward the inside in the radial direction of the ring body and arranged along the inner peripheral edge, the lock piece allows the elongated body to move toward one side in the axial direction of the ring body, while engaging with an outer peripheral surface of the pipe to prevent the elongated body from moving toward the other side in the axial direction. The marking according to embodiment 1.

[0009] According to this configuration, the marker ring can be attached to the outer peripheral surface of the pipe by inserting the elongated body through the marker ring toward one side in the axial direction of the ring body. On the other hand, the locking piece engages with the outer peripheral surface of the pipe, thereby preventing the long body from moving to the other side in the axial direction of the ring body. Therefore, even if an external force acts on the marker ring attached at a position a predetermined distance from the tip surface of the long body, the marker ring is prevented from moving toward the tip surface of the long body. This makes it possible to prevent incorrect assembly in which the insertion length of the long body into the pipe joint is shorter than the predetermined distance.

[0010] In addition, when the long body with the marker attached is inserted into the pipe fitting, the insertion length of the long body into the pipe fitting may be insufficient. In this case, the worker may move the marker toward the pipe fitting to deceive the worker into thinking that the insertion operation was performed properly. In this regard, according to the above-mentioned configuration, the marker cannot be moved toward the pipe fitting, so the above-mentioned deceitful operation is prevented.

[0011] [Aspect 3] The lock pieces are inclined so as to be positioned toward one side in the axial direction as they become radially inward of the ring body. The marking according to embodiment 2.

[0012] According to this configuration, when the long body is inserted into the marker ring and moved to one side in the axial direction of the ring body, the outer peripheral surface of the pipe slides against the tip of the locking piece, allowing the long body to move. On the other hand, when the long body is moved to the other side in the axial direction of the ring body, the tip of the locking piece engages with the outer peripheral surface of the pipe so as to bite into it, preventing the long body from moving. Therefore, the locking piece can be easily realized.

[0013] [Aspect 4] The ring body is a metal annular body press-formed integrally with the lock piece; a resin holding member that holds the annular body from an outer periphery side, A step portion is formed on the outer circumferential surface of the holding member. The marking according to embodiment 2 or embodiment 3.

[0014] According to this configuration, the multiple locking pieces that engage with the outer peripheral surface of the pipe and the annular body press-molded integrally with these locking pieces are made of metal, which makes it easy to ensure rigidity. Also, the step portion formed on the outer peripheral surface of the holding member is engaged and held by the engaging portion of the jig used when attaching the marker to the outer peripheral surface of the pipe. According to the above configuration, by making the holding member out of resin, the processing accuracy of the holding member having the step portion can be easily improved.

[0015] [Aspect 5] A marking tool used to attach the marker according to any one of aspects 1 to 4 to a position on the outer circumferential surface of the pipe at a predetermined distance from the tip surface of the elongated body, a jig body having an insertion space into which the elongated body is inserted and a reference surface provided in the insertion space to abut and regulate the insertion of the elongated body; a holder that holds the marker ring behind the reference plane in an insertion direction of the elongated body and allows the elongated body to be inserted into the marker ring; the holder can be switched between a locked state that prevents removal of the marker ring from the holder and an unlocked state that allows removal of the marker ring from the holder, and the holder is in the locked state while the elongated body is being inserted into the marker ring, and a switching means is provided that allows the holder to switch from the locked state to the unlocked state when the insertion of the elongated body is restricted by contact with the reference surface. Marking jig.

[0016] According to this configuration, when the long body is inserted into the marker ring held by the holder, the holder is in a locked state until the long body is prevented from being inserted into the insertion space by contacting the reference surface of the jig body. Therefore, if an attempt is made to pull out the long body before it is prevented from being contacted by the reference surface, removal of the marker ring from the holder is prevented. This prevents the marker ring from being attached to a position less than a predetermined distance from the tip surface of the long body.

[0017] On the other hand, when the insertion of the elongated body is restricted by contact with the reference surface of the jig body, the state of the holder is switched from the locked state to the unlocked state, which allows the marker ring to be removed from the holder, and the marker ring is attached at a position a predetermined distance from the tip surface of the elongated body.

[0018] In addition, the marker ring attached to the outer circumferential surface of the pipe protrudes radially outward from the outer circumferential surface, allowing the worker to easily grasp the insertion length of the elongated body into the pipe joint by visually checking the marker ring, thereby improving visibility.

[0019] [Aspect 6] the holder is supported by the jig body so as to be slidable along the axial direction of the elongated body, The switching means is a ring claw formed on the holder for removably holding the marker ring by elastic engagement; a lock surface formed on the jig body and facing the ring claw as the holder slides; In the locked state, the locking surface faces the ring claw to restrict elastic deformation of the ring claw, thereby preventing the marker ring from being removed from the ring claw. In the unlocked state, the locking surface is displaced relative to the ring claw to allow elastic deformation of the ring claw, thereby allowing removal of the marker ring from the ring claw. 6. The marking tool according to claim 5.

[0020] According to this configuration, when the long body is inserted into the marker ring held by the ring claw of the holder, the frictional resistance acting between the locking piece of the marker ring and the pipe causes the holder to slide along the axial direction of the long body as the long body is inserted. Then, as the holder slides, the positional relationship between the ring claw of the holder and the locking surface of the jig body changes, so that the state of the holder is switched between a locked state and an unlocked state. Therefore, the switching means can be easily realized.

[0021] [Aspect 7] The switching means is A holder claw formed on the jig body; an engagement step formed on the holder, the engagement step engaging with the holder claw to prevent the holder from sliding relative to the jig body, thereby maintaining the locked state; an unlocker that is provided to be capable of sliding along the axial direction relative to the jig body, and that approaches the holder claw when pressed by the elongated body inserted into the insertion space of the jig body, and that, in a state in which the insertion of the elongated body is restricted by abutment against the reference surface, pushes the holder claw to elastically deform it, thereby releasing the engagement between the holder claw and the engagement step; and a biasing member that biases the unlocker in a direction away from the holder claw in the axial direction. 7. The marking tool according to claim 6.

[0022] According to this configuration, the holder claws formed on the jig body engage with the engagement steps formed on the holder to prevent the holder from sliding relative to the jig body, thereby maintaining the locked state. Therefore, when inserting the long body into the marker ring held by the holder, the holder cannot be slid until the insertion of the long body into the insertion space is restricted by abutment against the reference surface of the jig body. This makes it impossible to pull out the long body from the jig body.

[0023] On the other hand, when the insertion of the long body is restricted by the reference surface, the unlocker is pushed by the long body to push the holder claw and elastically deform it, thereby releasing the engagement between the holder claw and the engagement step. At this time, when the long body is released from the jig by, for example, pulling the long body in the direction away from the jig, the holder slides in the axial direction away from the reference surface due to the biasing force of the biasing member and the force of the operator pulling the long body through the marker ring. As a result, the locking surface no longer abuts against the ring claw, allowing the ring claw to elastically deform, i.e., the state of the holder is switched from the locked state to the unlocked state.

[0024] According to the above-mentioned configuration, the long body cannot be pulled out from the jig body unless it is inserted until it is restricted by the reference surface, which makes it possible to more reliably attach the marker to the outer peripheral surface of the pipe at a position a predetermined distance from the tip end surface of the long body.

[0025] [Aspect 8] The switching means includes a pusher that is slidable in the axial direction relative to the jig body, The pusher is a reference surface abutment surface that faces the reference surface in the axial direction and abuts against the reference surface to restrict insertion of the elongated body; a contact surface for an elongated body, the contact surface being formed on the opposite side of the reference surface contact surface in the axial direction and contacting a tip end surface of the elongated body inserted into the insertion space; A coupling portion drivably coupled to the unlocker. 8. The marking tool according to claim 7.

[0026] According to this configuration, the pusher slides toward the reference surface as the tip surface of the elongated body presses the abutment surface for the elongated body. The abutment surface for the reference surface of the pusher abuts against the reference surface, restricting the insertion of the elongated body. In addition, since the connection portion of the pusher is drivingly connected to the unlocker, the unlocker also slides in association with the sliding movement of the pusher. In this way, by providing the pusher, it is possible to easily realize an unlocker that slides toward the holder claws as it is pushed by the elongated body inserted into the insertion space of the jig body.

[0027] [Aspect 9] The biasing member is interposed between the jig body and the pusher in the axial direction, a gap that allows relative movement between the pusher and the unlocker is formed between the connection portion of the pusher and the unlocker in the locked state on a side opposite to the reference surface in the axial direction, The switching means is The jig body is provided with an unlocker claw that elastically engages with the unlocker in contact with the holder claw, thereby applying frictional resistance to the unlocker that slides in the axial direction away from the reference surface. 9. The marking tool according to claim 8.

[0028] After the unlocker pushes the holder claw to elastically deform it, releasing the engagement between the holder claw and the engagement step, the unlocker may move away from the holder claw, causing the holder claw to re-engage with the engagement step and return to the locked state. In this case, it becomes impossible to pull out the long body from the jig body.

[0029] In this respect, according to the above configuration, a gap is formed between the connection part of the pusher and the unlocker in the locked state on the side opposite to the reference surface. In addition, the unlocker claw of the jig body elastically engages with the unlocker in the state of abutting against the holder claw, so that frictional resistance is applied to the unlocker sliding away from the reference surface in the axial direction. Therefore, even if the pusher starts to slide away from the reference surface due to the biasing force of the biasing member after the engagement between the holder claw and the engagement step is released, the unlocker does not slide until the gap is eliminated. This makes it possible to generate a time delay between when the pusher starts to slide away from the reference surface and when the unlocker slides. Therefore, it is possible to prevent the holder claw from re-engaging with the engagement step to return to the locked state.

[0030] When the gap disappears as the pusher slides, the unlocker is pushed by the connecting portion of the pusher, and the elastic engagement between the unlocker claw and the unlocker is released.

[0031] [Aspect 10] The elongated body is The pipe; an in-core having an in-core main body portion to be inserted into the pipe and a flange portion to be abutted against a tip end surface of the pipe, The contact surface for the elongated body of the pusher is an in-core corresponding region to which an end surface of the in-core is abutted; a pipe corresponding area against which the tip surface of the pipe without the in-core is abutted; The pipe corresponding area is located closer to the reference surface than the in-core corresponding area in the axial direction. The marking tool according to embodiment 8 or 9.

[0032] There may be cases where a pipe without an incore is inserted into a pipe joint, resulting in incorrect assembly. When the incore is not inserted into the pipe, the distance from the tip surface of the elongated body, i.e., the tip surface of the pipe, to the marker is longer than the above-mentioned predetermined distance by the thickness of the flange portion of the incore. However, since the thickness of the flange portion is relatively small, it is difficult to tell whether the incore is inserted into the pipe by visually checking the marker.

[0033] In this regard, according to the above configuration, when the incore is inserted into the pipe, the flange portion of the incore abuts against the incore corresponding area of ​​the pusher. On the other hand, when the incore is not inserted into the pipe, the tip surface of the pipe abuts against the pipe corresponding area of ​​the pusher. Here, the pipe corresponding area is located closer to the reference surface than the incore corresponding area in the axial direction. Therefore, the distance from the tip surface of the elongated body to the marker can be increased by a length greater than the thickness of the flange portion of the incore. This allows the operator to easily know that the incore is not inserted.

[0034] [Aspect 11] A marking tool used to attach a marker to an outer peripheral surface of an elongated body at a position a predetermined distance from a tip surface of the elongated body, a jig body having an insertion space into which the elongated body is inserted and a reference surface provided in the insertion space to abut and regulate the insertion of the elongated body; a holder that holds the marker ring behind the reference plane in an insertion direction of the elongated body and allows the elongated body to be inserted into the marker ring; the holder can be switched between a locked state that prevents removal of the marker ring from the holder and an unlocked state that allows removal of the marker ring from the holder, and the holder is in the locked state while the elongated body is being inserted into the marker ring, and a switching means is provided that allows the holder to switch from the locked state to the unlocked state when the insertion of the elongated body is restricted by contact with the reference surface. Marking jig.

[0035] According to this configuration, the same effect as that of the marking tool according to aspect 5 can be achieved not only in a long body having a pipe, but also in a long body not having a pipe. [Aspect 12] A pipe cutter used to attach the marker according to any one of aspects 1 to 4 to a position on the outer circumferential surface of the pipe at a predetermined distance from the tip surface of the pipe, A holder for holding the marker; a cutting unit having a blade that cuts the pipe in a state where the pipe is inserted into the marker ring along a direction perpendicular to the axial direction of the pipe, The distance in the axial direction between the marker and the blade body when held by the holding portion is set to the predetermined distance. Pipe cutter.

[0036] With this configuration, when the marker ring is held in the holding section and a pipe is inserted through the marker ring, and the pipe is cut by the blade of the cutting section, the marker ring becomes attached at a position a predetermined distance from the cut surface of the pipe, i.e., the tip surface.

[0037] In addition, the marker ring attached to the outer circumferential surface of the pipe protrudes radially outward from the outer circumferential surface, allowing the worker to easily grasp the insertion length of the elongated body into the pipe joint by visually checking the marker ring, thereby improving visibility.

[0038] [Aspect 13] The holding portion has an accommodating recess for accommodating the marker, The cutting portion is A support portion that supports an outer peripheral surface of the pipe; a blade handle portion that is fixed to the blade body and is rotatable with respect to the support portion about an axis parallel to the axial direction, and that rotates the blade body; 13. The pipe cutter according to embodiment 12.

[0039] According to this configuration, an operator can easily hold the marker by the holding part by storing the marker in the storage recess. Also, an operator can cut the pipe supported by the support part by rotating the blade together with the blade handle part. Therefore, a pipe cutter can be easily realized while reusing the configuration of an existing cutting part, such as the support part, the blade, and the blade handle part. Effect of the Invention

[0040] According to the present invention, the visibility of the marking can be improved. [Brief description of the drawings]

[0041] [Figure 1] FIG. 1 is a perspective view of a marking jig according to a first embodiment. [Diagram 2] FIG. 2 is another perspective view of the marking jig of FIG. [Diagram 3] FIG. 3 is a cross-sectional view of the marking jig of FIG. [Figure 4] FIG. 4 is an exploded perspective view of the marking jig of FIG. [Diagram 5]FIG. 5 is a side view of the marking jig of FIG. [Figure 6] FIG. 6 is another side view of the marking jig of FIG. [Figure 7] FIG. 7 is another side view of the marking jig of FIG. [Figure 8] FIG. 8 is a front view of the marking jig of FIG. [Figure 9] FIG. 9 is a rear view of the marking jig of FIG. [Figure 10] FIG. 10 is a perspective view of the marker according to the first embodiment. [Figure 11] FIG. 11 is a perspective view of the marker of FIG. [Figure 12] FIG. 12 is a cross-sectional view of the marker of FIG. [Figure 13] FIG. 13 is an exploded perspective view of the marker of FIG. [Figure 14] FIG. 14 is a side view of the marker of FIG. [Figure 15] FIG. 15 is a front view of the marker of FIG. [Figure 16] FIG. 16 is a rear view of the marker of FIG. [Figure 17] FIG. 17 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the first embodiment. [Figure 18] FIG. 18 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the first embodiment. [Figure 19] FIG. 19 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the first embodiment. [Figure 20] FIG. 20 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the first embodiment. [Figure 21] FIG. 21 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the first embodiment. [Figure 22]FIG. 22 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the first embodiment. [Diagram 23] FIG. 23 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the first embodiment. [Figure 24] FIG. 24 is a diagram showing a schematic diagram of a pipe joint, an elongated body, a marker, and a covering material. [Diagram 25] FIG. 25 is a cross-sectional view of a modified example of the marker. [Figure 26] FIG. 26 is a perspective view of the marking jig according to the second embodiment. [Figure 27] FIG. 27 is another perspective view of the marking jig of FIG. [Figure 28] FIG. 28 is a front view of the marking jig of FIG. [Figure 29] FIG. 29 is a rear view of the marking jig of FIG. [Diagram 30] FIG. 30 is a plan view of the marking jig of FIG. [Diagram 31] FIG. 31 is a bottom view of the marking jig of FIG. [Diagram 32] FIG. 32 is a side view of the marking jig of FIG. [Diagram 33] FIG. 33 is a cross-sectional view taken along line 33-33 in FIG. [Diagram 34] FIG. 34 is a cross-sectional view taken along line 34-34 in FIG. [Diagram 35] FIG. 35 is a perspective view of the marking jig in the open state according to the second embodiment. [Diagram 36] FIG. 36 is another perspective view of the marking jig of FIG. [Figure 37] FIG. 37 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the second embodiment. [Figure 38] FIG. 38 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the second embodiment. [Figure 39]FIG. 39 is a cross-sectional view illustrating a procedure for attaching a marker using the marking jig according to the second embodiment. [Diagram 40] FIG. 40 is a perspective view of a pipe cutter according to the third embodiment. [Diagram 41] FIG. 41 is another perspective view of the pipe cutter of FIG. [Diagram 42] FIG. 42 is another perspective view of the pipe cutter of FIG. [Diagram 43] FIG. 43 is another perspective view of the pipe cutter of FIG. [Diagram 44] FIG. 44 is a side view of the pipe cutter of FIG. [Diagram 45] FIG. 45 is another side view of the pipe cutter of FIG. [Figure 46] FIG. 46 is a plan view of the pipe cutter of FIG. [Figure 47] FIG. 47 is a bottom view of the pipe cutter of FIG. [Figure 48] FIG. 48 is a front view of the pipe cutter of FIG. [Figure 49] FIG. 49 is a rear view of the pipe cutter of FIG. [Figure 50] FIG. 50 is a plan view illustrating the procedure for attaching the markers using a pipe cutter. [Figure 51] FIG. 51 is a plan view illustrating the procedure for attaching the markers using a pipe cutter. [Figure 52] FIG. 52 is a plan view illustrating the procedure for attaching the markers using a pipe cutter. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0042] First Embodiment Hereinafter, a first embodiment of the marking and the marking tool will be described with reference to Figs.

[0043] <Long body 90> First, the elongated body 90 to which the marker 20 is attached will be described. 23 and 24, the long body 90 is inserted into the pipe fitting 100, and includes a pipe 91 made of resin such as cross-linked polyethylene or polybutene, and an incore 92 inserted into the pipe 91. The incore 92 has an incore main body 93 inserted into the pipe 91, and a flange portion 94 abutted against the tip surface of the pipe 91. The incore 92 is made of metal or resin.

[0044] <Marking 20> Next, the marker 20 will be described. As shown in FIGS. 10 to 16, the marker 20 is configured so as to be attachable to the outer circumferential surface of a pipe 91. As shown in FIG.

[0045] The marker ring 20 comprises a circular ring body 21 through which the elongated body 90 is inserted, and a plurality of locking pieces 28 extending from the inner peripheral edge of the ring body 21 radially inward of the ring body 21 and arranged along the inner peripheral edge.

[0046] The multiple locking pieces 28 are inclined so as to be located on one axial side (the left side in FIG. 12) as they move radially inward of the ring body 21. The locking pieces 28 allow the elongated body 90 to move to one axial side of the ring body 21, while engaging with the outer peripheral surface of the pipe 91 to prevent the elongated body 90 from moving to the other axial side.

[0047] The ring body 21 includes a metal annular body 27 that is press-molded integrally with a lock piece 28, and a resin holding member 22 that holds the annular body 27 from the outer periphery. The holding member 22 includes a first holding member 23 and a second holding member 26, both of which are annular.

[0048] As shown in Fig. 12, the outer peripheral surface of the first holding member 23 has an outer peripheral surface expanded diameter portion 23a and an outer peripheral surface reduced diameter portion 23b. The outer diameter of the outer peripheral surface reduced diameter portion 23b is smaller than the outer diameter of the outer peripheral surface expanded diameter portion 23a. The outer peripheral surface expanded diameter portion 23a is adjacent to one side of the outer peripheral surface reduced diameter portion 23b in the axial direction of the ring body 21 (the left side in Fig. 12). On the outer peripheral surface of the first holding member 23, a step portion 25 is formed by the outer peripheral surface expanded diameter portion 23a and the outer peripheral surface reduced diameter portion 23b.

[0049] The inner circumferential surface of the first holding member 23 has an inner circumferential surface expanded diameter portion 23c and an inner circumferential surface reduced diameter portion 23d. The inner diameter of the inner circumferential surface reduced diameter portion 23d is smaller than the inner diameter of the inner circumferential surface expanded diameter portion 23c. The inner circumferential surface expanded diameter portion 23c is adjacent to one side (the left side in FIG. 12) of the inner circumferential surface reduced diameter portion 23d in the axial direction of the ring body 21. The outer diameter of the annular body 27 is larger than the inner diameter of the inner circumferential surface reduced diameter portion 23d and smaller than the inner diameter of the inner circumferential surface expanded diameter portion 23c.

[0050] A plurality of (three in this embodiment) claws 24 protruding toward the inside in the radial direction of the ring body 21 are provided on the edge of the inner circumferential surface expanded diameter portion 23c. The outer peripheral surface of the second holding member 26 has an outer peripheral surface expanded diameter portion 26a and an outer peripheral surface reduced diameter portion 26b. The outer diameter of the outer peripheral surface reduced diameter portion 26b is smaller than the outer diameter of the outer peripheral surface expanded diameter portion 26a. The outer peripheral surface expanded diameter portion 26a is adjacent to the other side of the outer peripheral surface reduced diameter portion 26b in the axial direction of the ring body 21 (the right side in FIG. 12).

[0051] The second retaining member 26 is inserted into the first retaining member 23 from one axial side (the left side in FIG. 12) of the ring body 21. The outer peripheral surface expanded diameter portion 26a of the second retaining member 26 faces the inner peripheral surface expanded diameter portion 23c of the first retaining member 23.

[0052] The annular body 27 is sandwiched between the first holding member 23 and the second holding member 26 in the axial direction of the ring body 21. The claw portions 24 prevent the second holding member 26 from coming off the first holding member 23.

[0053] Next, the marking jig (hereinafter, jig 30) will be described. <Jig 30> As shown in FIGS. 1 to 9, the jig 30 is used to attach the marker 20 to the outer peripheral surface of the pipe 91 at a position a predetermined distance from the tip surface of the elongated body 90, i.e., the end surface of the flange portion 94 of the in-core 92.

[0054] 3 and 4, the jig 30 includes a case 40, a bottom 50, a holder 60, a pusher 70, an unlocker 80, and a biasing member 39. The jig 30 also includes a switching means .

[0055] (Case 40) The case 40 is cylindrical. A tip portion 41 of the case 40 has an outer diameter and an inner diameter that are smaller than those of a main body portion 43 located on the base end side. The inner peripheral surface of the tip portion 41 constitutes a lock surface 42, which will be described later.

[0056] In the following description, the axial direction, radial direction, and circumferential direction of the case 40 will be simply referred to as the axial direction, radial direction, and circumferential direction, respectively. Also, the left-right direction in Fig. 3 coincides with the axial direction. The left and right sides in Fig. 3 will be described as one side and the other side, respectively, in the axial direction.

[0057] (Bottom 50) 3 and 4, the bottom 50 is cylindrical with a bottom, and has a disk-shaped bottom wall 51 that closes the opening on the base end side of the main body portion 43, and a cylindrical peripheral wall 52 that extends from the peripheral edge of the bottom wall 51 and covers the outer circumferential surface of the main body portion 43. The bottom 50 is fixed to the main body portion 43.

[0058] A cylindrical tube portion 53 protrudes from the center of the inner surface of the bottom wall 51. The central axis of the tube portion 53 coincides with the central axis of the case 40. The tip surface of the tube portion 53 forms a reference surface 54, which will be described later.

[0059] A holder claw 56 and an unlocker claw 58 are provided on the inner surface of the bottom wall 51 so as to protrude therefrom. A plurality of holder claws 56 (three in this embodiment) are provided at equal intervals in the circumferential direction on the radial outer side of the tube portion 53. The holder claws 56 each have a leg portion 56a extending along the axial direction and a claw portion 56b provided at the tip of the leg portion 56a and protruding radially inward.

[0060] A plurality of unlocking claws 58 (three in this embodiment) are provided at equal intervals in the circumferential direction on the radial outer side of the tubular portion 53. The unlocking claws 58 have legs 58a extending along the axial direction and claws 58b provided at the tips of the legs 58a and protruding radially inward.

[0061] The unlocker claws 58 are located radially outward of the holder claws 56. The length by which the unlocker claws 58 protrude from the bottom wall 51 is greater than the length by which the holder claws 56 protrude from the bottom wall 51.

[0062] The case 40 and the bottom 50 form a jig body 31 . (Holder 60) As shown in FIGS. 3 and 4, the holder 60 has a base tube portion 61, a guided portion 62, an extension portion 63, a ring claw 64, a notch 65, a restricting protrusion 66, an engagement step 67, and a notch portion 68.

[0063] The base tube portion 61 is located inside the jig body 31 and extends along the axial direction. Both axial ends of the base tube portion 61 are open. The tube portion 53 of the bottom 50 is inserted into the opening on one side in the axial direction of the base tube portion 61. The long body 90 is inserted through the opening on the other side in the axial direction of the base tube portion 61. In this embodiment, the interior of the base tube portion 61 forms the insertion space S of the jig body 31.

[0064] The guided portion 62 has an outer peripheral surface that protrudes radially outward from the other end of the base cylindrical portion 61 in the axial direction and extends along the circumferential direction. A plurality of guided portions 62 (three in this embodiment) are provided at intervals from each other in the circumferential direction. The guided portion 62 is inserted into the tip portion 41 of the case 40.

[0065] The holder 60 is supported for sliding movement along the axial direction by the outer peripheral surface of the guided portion 62 abutting against the locking surface 42 of the case 40 and the inner peripheral surface of the base cylindrical portion 61 abutting against the outer peripheral surface of the cylindrical portion 53 of the bottom 50.

[0066] The extending portion 63 extends in an arc shape from the guided portion 62 to the other side in the axial direction. The outer circumferential surface of the extending portion 63 is connected to the outer circumferential surface of the guided portion 62 without any step. The ring claw 64 holds the marker ring 20 on the other axial side of the reference surface 54, i.e., on the rear side in the insertion direction of the elongated body 90. The ring claw 64 removably holds the marker ring 20 by elastic engagement.

[0067] The ring claw 64 is the other end of the base tube portion 61, and extends from a portion located between adjacent extension portions 63 in the circumferential direction. The ring claw 64 has a first portion 64a extending radially outward from the above portion of the base tube portion 61, a second portion 64b extending in an arc shape from the tip of the first portion 64a to the other side in the axial direction, and a claw portion 64c protruding from the inner surface of the tip of the second portion 64b. The outer peripheral surface of the second portion 64b is located on the same imaginary circle as the outer peripheral surface of the extension portion 63.

[0068] The notch 65 allows elastic deformation of the ring claw 64 and is provided between the ring claw 64 and the guided portion 62 . The restricting protrusion 66 is located at one axial end of the guided portion 62, and protrudes radially outward beyond the outer circumferential surface of the guided portion 62. The restricting protrusion 66 abuts against a step between the inner circumferential surface of the main body 43 of the case 40 and the inner circumferential surface of the tip portion 41, thereby restricting the holder 60 from coming out of the jig main body 31.

[0069] The engagement step 67 engages with the holder claws 56 when the holder 60 slides toward one side in the axial direction relative to the jig body 31, thereby preventing the holder 60 from sliding toward the jig body 31. The engagement step 67 is located on one side in the axial direction of the base cylindrical portion 61. The engagement step 67 in this embodiment is a groove extending in the circumferential direction.

[0070] The notch 68 extends from one end of the base cylinder portion 61 in the axial direction to the other end. A plurality of notches 68 (three in this embodiment) are provided at equal intervals in the circumferential direction. The notches 68 extend to a position on the other side of the engagement step 67 in the axial direction.

[0071] The holder 60 is configured to allow the elongated body 90 to be inserted through the marker ring 20 in a state in which the marker ring 20 is attached to the ring claws 64 by elastic engagement.

[0072] (Pusha 70) As shown in FIGS. 3 and 4, the pusher 70 has a base portion 71, a projection for an elongated body 72, a projection for a biasing member 73, and a connecting portion 74.

[0073] The base portion 71 is in the shape of a disk having an outer diameter smaller than the inner diameter of the base cylindrical portion 61 , and is housed within the base cylindrical portion 61 of the holder 60 . The protrusion 72 for elongated body protrudes in the axial direction from the other end face of the base portion 71 in the axial direction. The protrusion 72 for elongated body in this embodiment is cylindrical. The central axis of the protrusion 72 for elongated body coincides with the central axis of the base portion 71.

[0074] The biasing member projection 73 projects along the axial direction from one end face of the base portion 71 in the axial direction. The connecting portion 74 protrudes radially outward from the outer circumferential surface of the base portion 71. A plurality of connecting portions 74 (three in this embodiment) are provided at equal intervals in the circumferential direction. The connecting portions 74 radially penetrate the cutout portions 68 of the base cylindrical portion 61 of the holder 60. The pusher 70 is assembled to the base cylindrical portion 61 from one side in the axial direction.

[0075] The pusher 70 is provided to be able to slide along the axial direction relative to the base cylinder portion 61 by the connecting portion 74 sliding within the cutout portion 68. In other words, the pusher 70 is provided to be able to slide along the axial direction relative to the jig body 31.

[0076] The pusher 70 faces the reference surface 54 in the axial direction and has a reference surface abutment surface 70a that abuts against the reference surface 54 to restrict insertion of the elongated body 90. In this embodiment, one end face of the base portion 71 in the axial direction functions as the reference surface abutment surface 70a.

[0077] The pusher 70 has a long body abutment surface 70b formed on the opposite side to the reference surface abutment surface 70a in the axial direction and against which the tip surface of the long body 90 inserted into the insertion space S abuts. The long body abutment surface 70b has an incore corresponding region 72a against which the end surface of the incore 92 abuts, and a pipe corresponding region 71a against which the tip surface of the pipe 91 without the incore 92 attached abuts. The pipe corresponding region 71a is located on one side of the incore corresponding region 72a in the axial direction, i.e., on the reference surface 54 side.

[0078] In this embodiment, the end face of the elongate body protrusion 72 functions as an in-core corresponding region 72a, and the other end face in the axial direction of the base portion 71 functions as a pipe corresponding region 71a.

[0079] (Unrocker 80) 3 and 4, the unlocker 80 approaches the holder claws 56 by being pushed by the elongated body 90 inserted into the insertion space S. When the insertion of the elongated body 90 is restricted by the reference surface 54, the unlocker 80 pushes the holder claws 56 to elastically deform them, thereby releasing the engagement with the engagement step 67.

[0080] The unlocker 80 is substantially cylindrical, and has an inner peripheral surface that covers the outer peripheral surface of the base cylindrical portion 61 of the holder 60. The unlocker 80 is assembled to the base cylindrical portion 61 from one side in the axial direction.

[0081] The unlocker 80 has a notch 81 , a restricting protrusion 82 , and an annular claw 83 . The notches 81 extend to one side from the other axial end of the unlocker 80. Three notches 81 are provided corresponding to the three connecting portions 74 of the pusher 70. The connecting portions 74 of the pusher 70 are inserted into the notches 81 from the other axial side.

[0082] The restricting projections 82 are provided on a pair of edges of the cutout portion 81 that face each other in the circumferential direction. The annular claw 83 is provided at one end in the axial direction of the unlocker 80. The annular claw 83 is provided around the entire circumference of the unlocker 80.

[0083] The unlocker 80 is provided so as to be able to slide along the axial direction relative to the base cylindrical portion 61. That is, the unlocker 80 is provided so as to be able to slide along the axial direction relative to the jig body 31.

[0084] The length of the cutout portion 81 in the axial direction from the annular claw 83 to the restricting projection 82 is set to be greater than the thickness of the connecting portion 74 . The connecting portion 74 is restrained in contact with the annular claw 83 on one side in the axial direction, and is restrained in contact with the restraining protrusion 82 on the other side. This allows a driving force in the axial direction to be transmitted between the connecting portion 74 and the unlocker 80. In other words, the connecting portion 74 is drivingly connected to the unlocker 80.

[0085] (biasing member 39) 3 and 4, the biasing member 39 biases the unlocker 80 in the axial direction away from the holder claw 56. In detail, the biasing member 39 is interposed between the jig body 31 and the pusher 70 in the axial direction, and biases the unlocker 80 via the pusher 70.

[0086] The urging member 39 in this embodiment is, for example, a coil spring, and is housed inside the tubular portion 53 of the bottom 50. The urging member 39 is sandwiched between the inner surface of the bottom wall 51 of the bottom 50 and one end face of the base portion 71 of the pusher 70. The urging member protrusion 73 of the pusher 70 is inserted inside the urging member 39.

[0087] <Switching means 35> 3 and 4, the switching means 35 can switch the state of the holder 60 between a locked state that prevents the marker ring 20 from being removed from the holder 60, and an unlocked state that allows the marker ring 20 to be removed from the holder 60. The switching means 35 sets the state of the holder 60 to a locked state while the elongated body 90 is being inserted into the marker ring 20. The switching means 35 allows the state of the holder 60 to be switched from the locked state to the unlocked state when the insertion of the elongated body 90 is restricted by abutment against the reference surface 54.

[0088] In this embodiment, the ring claw 64, the locking surface 42, the holder claw 56, the engagement step 67, the unlocker 80, the biasing member 39, the pusher 70, and the unlocker claw 58 form the switching means 35.

[0089] <How to attach Marking 20> Next, a procedure for attaching the marker 20 to the elongated body 90 using the jig 30 will be described with reference to Figs.

[0090] 17, the worker holds the jig 30 with one hand and the marker 20 with the other hand. Then, the worker presses the marker 20 into the inner periphery of the ring claw 64 so that the outer periphery surface enlarged diameter portion 23a of the marker 20 faces the ring claw 64 of the jig 30.

[0091] 18, the ring claw 64 is elastically deformed and the claw portion 64c engages with the step portion 25 of the marker ring 20, thereby holding the marker ring 20 on the ring claw 64. At this time, the ring claw 64 is located on the other side of the tip portion 41 of the case 40 in the axial direction and is exposed to the outside.

[0092] Next, as shown in FIG. 19, the worker holds the jig 30 with one hand and holds the long body 90 with the incore 92 inserted into the pipe 91 with the other hand. Then, the long body 90 is inserted into the marker ring 20 with the incore 92 facing forward. At this time, the outer peripheral surface of the pipe 91 slides against the tip of the lock piece 28, allowing the long body 90 to move. At this time, due to frictional resistance acting between the lock piece 28 of the marker ring 20 and the pipe 91, the holder 60 slides along the axial direction as the long body 90 is inserted. As the holder 60 slides, the ring claw 64 of the holder 60 and the lock surface 42 of the jig body 31 face each other. As a result, the lock surface 42 abuts against and restricts the elastic deformation of the ring claw 64, thereby creating a locked state that prevents the marker ring 20 from being removed from the ring claw 64. At this time, the tip of the base tube portion 61 of the holder 60 abuts against the inner surface of the bottom wall 51 of the bottom 50. In addition, the holder claws 56 and the engagement steps 67 of the holder 60 engage with each other to prevent the holder 60 from sliding relative to the jig body 31, thereby maintaining the locked state.

[0093] As shown in FIG. 20, by further pushing the long body 90 into the jig 30, the pusher 70 is pushed in by the tip surface of the long body 90. Since the connection portion 74 of the pusher 70 is drivingly connected to the unlocker 80, the unlocker 80 also slides along with the sliding movement of the pusher 70. Then, the reference surface abutment surface 70a of the pusher 70 abuts against the reference surface 54, so that the insertion of the long body 90 is abutted and restricted. In this state, the annular claw 83 of the unlocker 80 is pushed by the long body 90 to push the holder claw 56 and elastically deform it radially outward, thereby releasing the engagement between the holder claw 56 and the engagement step 67. At this time, the unlocker claw 58 is elastically engaged with the annular claw 83.

[0094] 21 , when an operator releases the elongated body 90 from the jig 30, for example by pulling the elongated body 90 in the direction away from the jig 30, the holder 60 is pushed and slid in the axial direction away from the reference surface 54 by the biasing force of the biasing member 39 and the force of the operator pulling the elongated body 90 acting via the marker ring 20. In addition, the biasing force of the biasing member 39 causes the pusher 70 and the unlocker 80 connected to the pusher 70 to slide away from the reference surface 54.

[0095] 22, when the holder 60 moves further away from the reference surface 54 in the axial direction, the locking surface 42 is no longer in contact with the ring claw 64, allowing elastic deformation of the ring claw 64. In other words, the state of the holder 60 is switched from the locked state to an unlocked state that allows removal of the marker ring 20 from the ring claw 64.

[0096] This allows the elongated body 90, with the marker 20 attached to the outer circumferential surface of the pipe 91 at a position a predetermined distance from the tip surface of the elongated body 90, to be pulled out from the jig 30, as shown in FIG.

[0097] 20, after the holder claws 56 and the engagement step 67 are disengaged, the unlocker 80 may move away from the holder claws 56, causing the holder claws 56 to re-engage with the engagement step 67 and return to the locked state. In this case, the elongated body 90 cannot be pulled out from the jig body 31.

[0098] Here, between the connecting portion 74 of the pusher 70 in the locked state and the unlocker 80, a gap V that allows relative movement between the pusher 70 and the unlocker 80 is formed on the side opposite the reference surface 54 in the axial direction. In addition, the unlocker claws 58 of the jig body 31 elastically engage with the unlocker 80 in contact with the holder claws 56, thereby applying frictional resistance to the unlocker 80 that slides away from the reference surface 54 in the axial direction.

[0099] 21, even if the pusher 70 starts to slide away from the reference surface 54 due to the biasing force of the biasing member 39 after the holder claw 56 and the engagement step 67 are released, the unlocker 80 does not start to slide until the gap V is eliminated. This makes it possible to generate a time delay between when the pusher 70 starts to slide away from the reference surface 54 and when the unlocker 80 starts to slide. This makes it possible to prevent the holder claw 56 from re-engaging with the engagement step 67 and returning to the locked state.

[0100] When the gap V disappears as the pusher 70 slides, the unlocker 80 is pushed by the connecting portion 74 of the pusher 70, and the elastic engagement between the unlocker claw 58 and the unlocker 80 is released (the above is action 1).

[0101] Next, the effects of this embodiment will be described. (1-1) The marker 20 is applied to a long body 90 that includes a resin pipe 91 and is inserted into a pipe joint 100, and is configured so as to be attachable to the outer peripheral surface of the pipe 91.

[0102] According to this configuration, the marker 20 attached to the outer circumferential surface of the pipe 91 protrudes radially outward from the outer circumferential surface, thereby improving the visibility of the marking.

[0103] 24, the marker 20 is unlikely to be covered by the covering material 110, such as corrugated metal, that covers the pipe 91. Therefore, in the inspection work after construction, the marker 20 can be visually confirmed without peeling back the covering material 110.

[0104] (1-2) The marker ring 20 includes a ring body 21 and a plurality of locking pieces 28. The locking pieces 28 allow the elongated body 90 to move to one side in the axial direction of the ring body 21, while engaging with the outer peripheral surface of the pipe 91 to prevent the elongated body 90 from moving to the other side in the axial direction.

[0105] According to this configuration, the marker ring 20 can be attached to the outer peripheral surface of the pipe 91 by inserting the elongated body 90 through the marker ring 20 toward one side in the axial direction of the ring body 21 .

[0106] On the other hand, the lock piece 28 engages with the outer peripheral surface of the pipe 91, thereby preventing the elongated body 90 from moving to the other side in the axial direction of the ring body 21. Therefore, even if an external force acts on the marker ring 20 attached at a position a predetermined distance from the tip surface of the elongated body 90, the marker ring 20 is prevented from moving toward the tip side of the elongated body 90. This makes it possible to prevent erroneous assembly in which the insertion length of the elongated body 90 into the pipe fitting 100 becomes shorter than the above-mentioned predetermined distance.

[0107] Furthermore, when the elongated body 90 with the marker 20 attached is inserted into the pipe fitting 100, the insertion length of the elongated body 90 into the pipe fitting 100 may be insufficient. In this case, the worker may deceive the operator into thinking that the insertion operation has been performed properly by moving the marker 20 toward the pipe fitting 100. In this regard, according to the above-mentioned configuration, the marker 20 cannot be moved toward the pipe fitting 100, so the above-mentioned deceitful operation is prevented.

[0108] (1-3) The lock pieces 28 are inclined so that the more radially inward the lock pieces 28 are, the more likely they are to be positioned on one side in the axial direction of the ring body 21. According to this configuration, when the long body 90 is inserted into the marker ring 20 and moved to one side in the axial direction of the ring body 21, the outer peripheral surface of the pipe 91 slides against the tip of the lock piece 28, allowing the movement of the long body 90. On the other hand, when the long body 90 is moved to the other side in the axial direction of the ring body 21, the tip of the lock piece 28 engages so as to bite into the outer peripheral surface of the pipe 91, preventing the movement of the long body 90. Therefore, the lock piece 28 can be easily realized.

[0109] (1-4) The ring body 21 includes a metal annular body 27 press-molded integrally with the lock piece 28, and a resin retaining member 22 that retains the annular body 27 from the outer periphery. A step portion 25 is formed on the outer periphery of the retaining member 22. According to this configuration, the multiple lock pieces 28 that engage with the outer peripheral surface of the pipe 91 and the annular body 27 press-molded integrally with these lock pieces 28 are made of metal, which makes it easy to ensure rigidity. Also, the stepped portion 25 formed on the outer peripheral surface of the holding member 22 is engaged and held by the ring claws 64 of the jig 30 used when attaching the marker ring 20 to the outer peripheral surface of the pipe 91. According to the above configuration, by making the holding member 22 out of resin, the processing precision of the holding member 22 having the stepped portion 25 can be easily improved.

[0110] (1-5) The jig 30 is used to attach the marker 20 to the outer circumferential surface of the pipe 91 at a position a predetermined distance from the tip surface of the elongated body 90. The jig 30 includes a jig body 31, a holder 60, and a switching means 35.

[0111] According to this configuration, when the elongated body 90 is inserted into the marker 20 held by the holder 60, the holder 60 is in a locked state until the insertion of the elongated body 90 into the insertion space S is restricted by abutment against the reference surface 54 of the jig body 31. Therefore, if an attempt is made to pull out the elongated body 90 before it is restricted by abutment against the reference surface 54, removal of the marker 20 from the holder 60 is prevented. This prevents the marker 20 from being attached to a position less than a predetermined distance from the tip surface of the elongated body 90.

[0112] On the other hand, when the insertion of the elongated body 90 is restricted by abutment against the reference surface 54 of the jig body 31, the state of the holder 60 is switched from the locked state to the unlocked state. This allows the marker 20 to be removed from the holder 60, and the marker 20 is attached to a position at a predetermined distance from the tip surface of the elongated body 90.

[0113] Furthermore, the marker ring 20 attached to the outer circumferential surface of the pipe 91 protrudes radially outward from the outer circumferential surface, thereby improving the visibility of the marking. (1-6) The holder 60 is supported by the jig body 31 so as to be capable of sliding along the axial direction of the elongated body 90. The switching means 35 includes a ring claw 64 and a locking surface 42. In the locked state, the switching means 35 is configured such that the locking surface 42 faces the ring claw 64 and abuts against it to restrict elastic deformation of the ring claw 64, thereby preventing the marker ring 20 from being removed from the ring claw 64. In the unlocked state, the switching means 35 is configured such that the locking surface 42 shifts axially relative to the ring claw 64 to allow elastic deformation of the ring claw 64, thereby allowing the marker ring 20 to be removed from the ring claw 64.

[0114] According to this configuration, when the elongated body 90 is inserted into the marker ring 20 held by the ring claw 64, the frictional resistance acting between the lock piece 28 and the pipe 91 causes the holder 60 to slide along the axial direction of the elongated body 90 as the elongated body 90 is inserted. Then, as the holder 60 slides, the positional relationship between the ring claw 64 of the holder 60 and the lock surface 42 of the jig body 31 changes, and the state of the holder 60 is switched between a locked state and an unlocked state. Therefore, the switching means 35 can be easily realized.

[0115] (1-7) The switching means 35 includes the holder claw 56, the engagement step 67, the unlocker 80, and the biasing member 39. According to this configuration, the holder claws 56 formed on the jig body 31 engage with the engagement step 67 formed on the holder 60 to prevent the holder 60 from sliding relative to the jig body 31, thereby maintaining the locked state. Therefore, when the long body 90 is inserted into the marker 20 held by the holder 60, the holder 60 cannot be slid until the insertion of the long body 90 into the insertion space S is restricted by abutment against the reference surface 54 of the jig body 31. This makes it impossible to pull out the long body 90 from the jig body 31.

[0116] On the other hand, in a state where the insertion of the long body 90 is restricted by contact with the reference surface 54, the unlocker 80 is pushed by the long body 90 to push the holder claw 56 and elastically deform it, thereby releasing the engagement with the engagement step 67. Also, at this time, when the long body 90 is released from the jig 30 by, for example, pulling the long body 90 in a direction away from the jig 30, the holder 60 slides in the axial direction toward the side away from the reference surface 54 due to the biasing force of the biasing member 39 and the force of the operator pulling the long body 90 through the marker ring 20. As a result, the lock surface 42 no longer contacts the ring claw 64, and elastic deformation of the ring claw 64 is permitted, i.e., the state of the holder 60 is switched from the locked state to the unlocked state.

[0117] According to the above-described configuration, the long body 90 cannot be pulled out from the jig body 31 unless the long body 90 is inserted until it is restricted in contact with the reference surface 54. This makes it possible to more reliably attach the marker 20 to the outer circumferential surface of the pipe 91 at a position a predetermined distance from the tip surface of the long body 90.

[0118] (1-8) The switching means 35 includes a pusher 70 that is slidable in the axial direction relative to the jig body 31. The pusher 70 includes a reference surface abutment surface 70a, a long body abutment surface 70b, and a connecting portion 74.

[0119] According to this configuration, the long body abutment surface 70b is pushed by the tip surface of the long body 90, causing the pusher 70 to slide toward the reference surface 54. Then, the reference surface abutment surface 70a of the pusher 70 abuts against the reference surface 54, restricting the insertion of the long body 90. In addition, since the connection portion 74 of the pusher 70 is drivingly connected to the unlocker 80, the unlocker 80 also slides in accordance with the sliding movement of the pusher 70. In this way, by providing the pusher 70, it is possible to easily realize the unlocker 80 that slides to approach the holder claw 56 by being pushed by the long body 90 inserted into the insertion space S of the jig main body 31.

[0120] (1-9) The biasing member 39 is interposed between the jig body 31 and the pusher 70 in the axial direction. Between the connecting portion 74 of the pusher 70 in the locked state and the unlocker 80, a gap V that allows relative movement between the pusher 70 and the unlocker 80 is formed on the side opposite to the reference surface 54 in the axial direction. The switching means 35 is provided with an unlocker claw 58.

[0121] According to this configuration, the above-mentioned function 1 can be achieved, and therefore the holder claw 56 can be prevented from re-engaging with the engagement step 67 and returning to the locked state. (1-10) The elongated body 90 includes a pipe 91 and an in-core 92. The elongated body contact surface 70b of the pusher 70 includes an in-core corresponding region 72a and a pipe corresponding region 71a. The pipe corresponding region 71a is located closer to the reference surface 54 than the in-core corresponding region 72a in the axial direction.

[0122] There may be cases where an incorrect assembly occurs in which a pipe 91 without an incore 92 inserted therein is inserted into the pipe fitting 100. When the incore 92 is not inserted into the pipe 91, the distance from the tip surface of the elongated body 90, i.e., the tip surface of the pipe 91, to the marker 20 becomes longer than the above-mentioned predetermined distance by the thickness of the flange portion 94 of the incore 92. However, because the thickness of the flange portion 94 is relatively small, it is difficult to tell whether the incore 92 is inserted into the pipe 91 by visually checking the marker 20.

[0123] In this regard, according to the above configuration, when the incore 92 is inserted into the pipe 91, the flange portion 94 of the incore 92 abuts against the incore corresponding region 72a of the pusher 70. On the other hand, when the incore 92 is not inserted into the pipe 91, the tip surface of the pipe 91 abuts against the pipe corresponding region 71a of the pusher 70. Here, the pipe corresponding region 71a is located closer to the reference plane 54 than the incore corresponding region 72a in the axial direction. Therefore, the distance from the tip surface of the elongated body 90 to the marker 20 can be increased by a length greater than the thickness of the flange portion 94 of the incore 92. This allows the operator to easily know that the incore 92 is not inserted.

[0124] <Second embodiment> A marking tool (hereinafter, tool 230) of the second embodiment will be described below with reference to FIGS.

[0125] As shown in FIGS. 33 to 35, the jig 230 includes a case 240, a pusher 260, a cover 270, a first biasing member 281, and a second biasing member 282. As shown in FIG. (Case 240) As shown in FIGS. 26 to 36, the case 240 is in the shape of a substantially rectangular parallelepiped box.

[0126] As shown in Figures 33 and 34, the case 240 has a bottom wall 241 having a substantially rectangular plate shape, a pair of side walls 244 erected at both ends of the bottom wall 241 in the width direction, and a front wall 246 and a rear wall 248 erected at one end and the other end of the bottom wall 241 in the longitudinal direction, respectively.

[0127] In the following description, the longitudinal direction of the bottom wall 241 is defined as the front-rear direction, and the sides in the front-rear direction where the front wall 246 and the rear wall 248 are located are defined as the front side and the rear side, respectively. The thickness direction of the bottom wall 241 is defined as the up-down direction, and the side in the up-down direction where the bottom wall 241 is located and the opposite side are defined as the lower side and the upper side. The direction perpendicular to both the front-rear direction and the up-down direction is defined as the width direction.

[0128] As shown in FIGS. 35 and 36, the case 240 has an opening formed by the upper edges of a pair of side walls 244, a front wall 246, and a rear wall 248. As shown in FIG. 33, the case 240 is provided with a partition wall 250 that partitions the interior of the case 240 into a front accommodating portion 252 and a rear accommodating portion 254 located rearward of the front accommodating portion 252.

[0129] 35, the front accommodating portion 252 and the rear accommodating portion 254 respectively have a front opening 253 and a rear opening 255 that open upward. The partition wall 250 is continuous with the bottom wall 241 and the inner surfaces of the pair of side walls 244.

[0130] 35 and 36, the rear wall 248 and the partition wall 250 are provided with insertion recesses 249, 251, respectively, that allow the elongated body 90 to be inserted into the case 240. The insertion recesses 249, 251 are U-shaped in front view and open upward (see FIG. 28). The insertion recesses 249, 251 have the same shape and size.

[0131] 33, a plurality of (three in this embodiment) guide ribs 243 extending along the front-rear direction are protruded from the inner surface of the bottom wall 241. The plurality of guide ribs 243 are provided at intervals from one another in the width direction. The upper ends of the guide ribs 243 are located at the same position in the up-down direction as the portions of the upper edges of the insertion recesses 249, 251 that overlap with the guide ribs 243 in the front-rear direction. In other words, the upper end of the guide rib 243 located on the outer side in the width direction is located higher than the upper end of the guide rib 243 located on the inner side.

[0132] 34, two pairs of regulating ribs 242 are provided on the inner surface of the bottom wall 241, protruding outward in the width direction from two guide ribs 243 located on both sides in the width direction. The regulating ribs 242 have a regulating protrusion 242a that regulates the upward movement of a pusher 260, which will be described later. In this embodiment, three pairs (six in total) of regulating ribs 242 are provided at intervals from each other in the front-rear direction.

[0133] As shown in FIGS. 35 and 36, a pair of support holes 245 for rotatably supporting a cover 270 (described later) are provided in the vicinity of the upper edges of the front ends of the pair of side walls 244. (Pusha 260) As shown in FIGS. 33 to 35, the pusher 260 is accommodated in the front accommodating portion 252 and is configured to be movable in the front-rear direction.

[0134] The pusher 260 has a pressing wall 261 having a rectangular plate shape when viewed from the front and arranged parallel to the front wall 246, a pair of side walls 262 extending rearward from both ends of the pressing wall 261 in the width direction, and a pair of locking claws 263 provided on each of the pair of side walls 262.

[0135] The pressing wall 261 is disposed between the front restriction rib 242 and the central restriction rib 242 (see FIG. 34). The locking claw 263 protrudes rearward from the upper end portion of the rear end of the side wall 262 .

[0136] As shown in FIG. 35, one side wall 262 is provided with a support recess 264 that supports one end of a second biasing member 282, which will be described later. 34 to 36, leg portions 265 extending in the front-rear direction are provided at the lower ends of the side walls 262. The leg portions 265 extend both rearward and forward of the pressing wall 261, respectively.

[0137] The upper surfaces of the portions of the leg portions 265 that protrude widthwise inward beyond the side walls 262 come into contact with the lower surfaces of the restricting protrusions 242a of the restricting ribs 242, thereby restricting the upward movement of the pusher 260.

[0138] 33, a spring support portion 266 that protrudes forward is provided on the front surface of the pressing wall 261. The spring support portion 266 extends along the front-rear direction. The spring support portion 266 has, for example, a cross-shaped cross section.

[0139] The pusher 260 is configured to be movable in the front-rear direction between a rear position where the rear ends of the legs 265 abut against the front surface of the partition wall 250 and a front position where the front ends of the legs 265 abut against a reference surface 247, which is the inner surface of the front wall 246.

[0140] (First biasing member 281) The first biasing member 281 biases the pusher 260 rearward, and is provided between the front surface of the pressing wall 261 and the inner surface of the front wall 246.

[0141] The first biasing member 281 of the present embodiment is a coil spring. The spring support portion 266 of the pusher 260 is inserted into the first biasing member 281. (Cover 270) As shown in FIGS. 33 to 36, the cover 270 has a cover main body 271 configured to be able to open and close the front opening 253 of the case 240, and two rotating shaft portions 272 which are inserted into the pair of support holes 245, respectively.

[0142] Hereinafter, the configuration of cover 270 in a position in which it closes front opening 253 of case 240 will be described. The cover body 271 is in the form of a generally rectangular plate that is long in the front-rear direction.

[0143] A plurality of (three in this embodiment) guide ribs 274 extending along the front-rear direction are protruded from the inner surface of the cover main body 271. The plurality of guide ribs 274 face the plurality of guide ribs 243 of the case 240 in the up-down direction, respectively.

[0144] The lower ends of the guide ribs 274 positioned on the outer sides in the width direction are positioned lower than the lower ends of the guide ribs 274 positioned on the inner sides (see FIG. 28). The outer peripheral surface of the elongated body 90 slides over the upper edges of the insertion recesses 249, 251, the upper ends of the multiple guide ribs 243, and the lower ends of the multiple guide ribs 274, thereby guiding the insertion of the elongated body 90 into the case 240 in the front-to-rear direction.

[0145] As shown in FIGS. 34 to 36, the cover 270 has a pair of locking claws 273 configured to be capable of being engaged with the pair of locking claws 263 of the pusher 260, respectively. As shown in FIG. 34, the locking claw 273 protrudes downward from the rear end of the cover main body 271 and is bent to protrude forward.

[0146] As shown in FIG. 36, one end in the width direction of the front end of the cover main body 271 is provided with an accommodating recess 275 for accommodating a second biasing member 282, which will be described later. (Second biasing member 282) 35, the second biasing member 282 serves to rotationally bias the cover 270 in the opening direction. The second biasing member 282 in this embodiment is a torsion coil spring.

[0147] As described above, one end of the second biasing member 282 is supported by the support recess 264 of the pusher 260. In addition, the other end of the second biasing member 282 is supported by the inner surface of the cover main body 271.

[0148] In the jig 230 having such a configuration, as shown in Fig. 34, when the cover 270 is closed against the biasing force of the second biasing member 282, the lock claw 263 is pressed forward by the lock claw 273 of the cover 270, and the pusher 260 moves forward. Then, when the cover 270 closes the front opening 253 of the case 240, the pressing force acting on the lock claw 263 by the lock claw 273 is released, and the pusher 260 moves rearward. As a result, the lock claw 263 engages with the lock claw 273. This maintains a state in which the cover 270 is prevented from rotating in the opening direction.

[0149] <How to attach Marking 20> Next, a procedure for attaching the marker 20 to the elongated body 90 using the jig 230 will be described with reference to FIGS.

[0150] 37, the worker holds the jig 230 with one hand and holds the marker 20 with the other hand. Then, the worker pushes the marker 20 from above into the rear storage portion 254. Although not shown in the figure, the marker 20 is stored in the rear storage portion 254 with the tip edge of the lock piece 28 facing forward.

[0151] Next, the worker holds the jig 30 with one hand and holds the elongated body 90 with the other hand. Then, the elongated body 90 is inserted into the marker 20 through the insertion recess 249, and is pressed against the pressing wall 261 of the pusher 260 through the insertion recess 251. In this state, the locking claws 263, 273 are engaged with each other, and the cover 270 cannot be opened. Therefore, the elongated body 90 interferes with the cover 270, and the marker 20 with the elongated body 90 inserted therein cannot be removed from the rear storage portion 254 (locked state).

[0152] 38, when the pressing wall 261 is pushed in by the elongated body 90, the front ends of the legs 265 of the pusher 260 come into contact with the reference surface, thereby restricting the insertion of the elongated body 90. At this time, the distance from the tip surface of the elongated body 90 to the marker ring 20 becomes a predetermined distance. At this time, the engagement between the locking claw 263 and the locking claw 273 of the cover 270 is released as the pusher 260 moves forward.

[0153] 39, the cover 270 is opened by the biasing force of the second biasing member 282. Therefore, by moving the marker 20 with the elongated body 90 inserted therethrough upward, it can be removed from the jig 230 through the front opening 253 and the rear opening 255 (unlocked state).

[0154] In this embodiment, the front accommodation portion 252 corresponds to the insertion space, and the case 240 corresponds to the jig body. The rear accommodation portion 254 corresponds to the holder. The pusher 260, the cover 270, the first biasing member 281, and the second biasing member 282 correspond to the switching means.

[0155] Next, the effects of this embodiment will be described. (2-1) When the long body 90 is inserted until the legs 265 of the pusher 260 abut against the reference surface 247, the cover 270 rotates and opens, and the long body 90 with the marker 20 attached thereto can be moved in a direction intersecting the axial direction, i.e., upward, and removed from the jig 230. This makes it possible to suppress misalignment of the marker 20 with respect to the long body 90.

[0156] <Third embodiment> Hereinafter, a third embodiment of a pipe cutter will be described with reference to Figs.

[0157] The pipe cutter 330 is used to attach the marker 20 to a position on the outer circumferential surface of the pipe 91 at a predetermined distance from the tip surface of the pipe 91. As shown in FIGS. 40 to 49, the pipe cutter 330 includes a cutting portion 340 and a holding portion 370. The cutting portion 340 and the holding portion 370 are arranged in a cutting position.

[0158] <Cutting part 340> As shown in FIGS. 40, 41, and 46, the cutting portion 340 has a support portion 341, a blade body 350, and a blade body handle portion 352.

[0159] The support portion 341 has a support surface 342 that supports the outer circumferential surface of the pipe 91. The support surface 342 has a V-shaped cross section. In the following description, the axial direction of the pipe 91 supported by the support portion 341 will be simply referred to as the axial direction. Also, the height direction of the support portion 341, which is a direction perpendicular to the axial direction, will be simply referred to as the height direction, and the side in the height direction where the support surface 342 is provided will be referred to as the upper side, and the opposite side will be referred to as the lower side. Also, the direction perpendicular to both the axial direction and the height direction will be referred to as the longitudinal direction.

[0160] The support surface 342 is provided with an escape groove 343 for allowing a blade body 350, which will be described later, to escape. The escape groove 343 extends along the longitudinal direction. The support portion 341 is integrally provided with a main body handle portion 344 extending along the longitudinal direction.

[0161] As shown in Figures 42, 43 and 47, the lower surfaces of the support part 341 and the main body handle part 344 are provided with a recess 345 configured to be capable of accommodating a part of the blade handle part 352 described later.

[0162] As shown in FIGS. 42 and 47, a first engagement portion 346 and a second engagement portion 347 for detachably attaching a holding portion 370 to the support portion 341 are provided on one axial side surface of the support portion 341.

[0163] In this embodiment, a pair of first engagement parts 346 are provided on the side surface so as to protrude from each other at a distance in the longitudinal direction. The first engagement parts 346 are ribs extending along the height direction, protruding from the side surface in the axial direction and bending to protrude outward in the longitudinal direction. In addition, a pair of second engagement parts 347 are provided on the side surface so as to be recessed from each other at a distance in the longitudinal direction between the pair of first engagement parts 346. The second engagement parts 347 open to the lower surface of the support part 341.

[0164] As shown in Figures 42 and 47, the blade 350 cuts the pipe 91 supported on the support surface 342 along a direction perpendicular to the axial direction of the pipe 91, and has a cutting edge 351 which is a straight blade.

[0165] As shown in FIGS. 40 to 47, the blade handle portion 352 is used to rotate the blade 350, and is fixed to the blade 350 and is provided rotatable relative to the support portion 341 about an axis parallel to the axial direction.

[0166] The blade handle portions 352 sandwich the base end portion of the blade 350 from both sides in the axial direction, and extend on the opposite side to the tip end of the blade 350 in the extending direction of the blade tip 351 . In this embodiment, the blade handle portion 352 and the blade 350 are rotatably connected to the main body handle portion 344 by a connecting shaft portion 360 extending along the axial direction. The connecting shaft portion 360 has a sleeve thread and a male thread that is screwed into the sleeve thread.

[0167] <Holding part 370> 40, 41, and 46, the holding portion 370 holds the marker ring 20. The holding portion 370 has an accommodating recess 371 that accommodates the marker ring 20. The holding portion 370 is attached adjacent to the support portion 341 in the axial direction.

[0168] 42 and 47, a pair of first engagement portions 376 into which the pair of first engagement portions 346 of the support portion 341 are respectively fitted are provided on a wall portion of the holding portion 370 facing the support portion 341. The first engagement portions 376 are slits extending in the height direction.

[0169] The wall portion is provided with a pair of second engagement portions 377 which are engaged with the pair of second engagement portions 347 of the support portion 341. The second engagement portions 377 have claw portions. As shown in FIGS. 40, 41, and 46, the holding portion 370 has a V-shaped cross section and a support surface 373 that is flush with the support surface 342.

[0170] The accommodating recess 371 is located on the opposite side of the support surface 373 to the support portion 341, and opens upward. The axial width of the accommodating recess 371 is set to be slightly larger than the width of the marker 20. This restricts the movement of the marker 20 in the axial direction within the accommodating recess 371.

[0171] 42, 43, 46, and 47, a restriction hole 372 is provided in the bottom wall of the accommodating recess 371. The outer peripheral surface of the marker ring 20 abuts against the edge of the restriction hole 372, thereby restricting the movement of the marker ring 20 in the longitudinal direction within the accommodating recess 371.

[0172] 40 to 44 and 45, a side wall 374 of the accommodating recess 371 is provided with an allowable recess 375 that opens upward and allows the pipe 91 to pass through. The allowable recess 375 is configured to allow the pipe 91 to pass through the marker 20 accommodated in the accommodating recess 371, and to allow the marker 20 with the pipe 91 inserted to be accommodated in the accommodating recess 371.

[0173] In the pipe cutter 330, the distance in the axial direction between the marker 20 held by the holding portion 370 and the cutting edge 351 of the blade body 350 is set to a predetermined distance. <How to attach Marking 20> Next, with reference to Figs. 50 to 52, a procedure for using a pipe cutter 330 to attach the marker 20 to a position on the outer circumferential surface of the pipe 91 at a predetermined distance from the tip surface of the pipe 91 will be described.

[0174] 50, the worker stores the marker ring 20 in the storage recess 371. At this time, the marker ring 20 is positioned by abutting the outer peripheral surface of the marker ring 20 against the edge of the restriction hole 372. Although not shown in the drawings, the marker ring 20 is stored in the storage recess 371 with the tip edge of the lock piece 28 facing the support portion 341.

[0175] Next, the operator rotates the blade handle portion 352 to move the blade 350 away from the support surface 342 . Next, the worker inserts the pipe 91 through the marker 20 through the allowable recess 375 and pushes the pipe 91 in the axial direction until the tip of the pipe 91 passes the position of the blade body 350, and more preferably until it passes through the support portion 341.

[0176] 51, the operator holds the pipe 91 in one hand while gripping the main body handle portion 344 and the blade handle portion 352 with the other hand to rotate the blade 350, thereby pressing the blade tip 351 against the pipe 91. As a result, the support surface 342 and the blade tip 351 work together to cut the pipe 91, as shown in FIG.

[0177] Next, the effects of this embodiment will be described. (3-1) With the marker 20 held by the holding portion 370 and the pipe 91 inserted through the marker 20, the pipe 91 is cut by the blade 350 of the cutting portion 340. This results in the marker 20 being attached to the cut surface of the pipe 91, i.e., at a position a predetermined distance from the tip surface.

[0178] Furthermore, the marker ring 20 attached to the outer circumferential surface of the pipe 91 protrudes radially outward from the outer circumferential surface. Therefore, an operator can easily grasp the insertion length of the elongated body 90 into the pipe joint by visually checking the marker ring 20. Therefore, visibility can be improved.

[0179] (3-2) An operator can easily hold the marker 20 with the holding part 370 by storing the marker 20 in the storage recess 371. In addition, an operator can cut the pipe 91 supported by the support part 341 by rotating the blade 350 together with the blade handle part 352. Therefore, the pipe cutter 330 can be easily embodied while utilizing the configuration of the existing cutting part 340, such as the support part 341, the blade 350, and the blade handle part 352.

[0180] <Modification> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

[0181] In the above embodiment, the elongated body 90 is inserted into the marker ring 20 while the ring claws 64 are exposed to the outside, but the method of using the jig 30 is not limited to this. The elongated body 90 may be inserted into the marker ring 20 after the ring claws 64, which engage and hold the marker ring 20, are pushed into the case 40 using fingers.

[0182] It is also possible to omit the long body protrusion 72. In other words, the pipe corresponding region 71a and the in-core corresponding region 72a can be provided at the same position in the axial direction. The unlocking claws 58 may be omitted.

[0183] The marker 20 may be attached to the elongated body 90 without using the jig 30. The entire marker ring 20 may be made of metal. Also, the entire marker ring 20 may be made of resin.

[0184] The marker ring 20 is not limited to having a ring body 21 and a lock piece 28. For example, as shown in Fig. 25, the marker ring 120 may be formed of a ring body 121 and an annular fitting member 128 that is held by the ring body 121 and can be fitted onto the outer circumferential surface of the pipe 91.

[0185] By constructing the jig body 31 from a transparent or translucent material or by forming a confirmation window in the jig body 31 (case 40) near the reference surface 54, it is possible to visually confirm from the outside that the insertion of the elongated body 90 has been restricted by abutment against the reference surface 54.

[0186] Provide a means for notifying that insertion of the elongated body 90 has been restricted by contact with the reference surface 54. For example, when the reference surface contact surface 70a of the pusher 70 comes into contact with the reference surface 54, a display, light, sound, vibration, or the like may be generated to notify the operator of this.

[0187] In the above embodiment, the switching means 35 is embodied by a mechanical configuration, but is not limited to this. In short, the switching means may be capable of switching the state of the holder between a locked state that prevents the marker ring from being removed from the holder and an unlocked state that allows the marker ring to be removed from the holder, and may be capable of switching the state of the holder from the locked state to the unlocked state when the insertion of the elongated body 90 is restricted by abutment against a reference surface, and may be embodied by an electrical configuration.

[0188] The jig 30 is not limited to being used for attaching markers to the outer peripheral surface of the pipe 91 of the elongated body 90 to be inserted into the pipe fitting 100, but can also be used for attaching markers to the outer peripheral surface of other elongated bodies such as electric wires.

[0189] The procedure for attaching the marker 20 is not limited to that described in the third embodiment, and the marker 20 may be accommodated in the accommodating recess 371 after the pipe 91 is inserted into the marker 20.

[0190] In the third embodiment, the shapes of the support surface 342 and the support surface 373 are not limited to a V-shaped cross section. The shapes of the support surface 342 and the support surface 373 may be any shape capable of supporting the pipe 91, and may be, for example, a U-shaped cross section.

[0191] The shapes of the main body handle portion 344 and the blade handle portion 352 can be changed as desired. In the third embodiment, the holding part 370 may be removably attached not only to one side in the axial direction of the support part 341 but also to the other side. This allows the attachment position of the holding part 370 to be changed depending on the dominant hand (right-handed or left-handed) of the operator.

[0192] In the third embodiment, the holding portion 370 may be provided so as to be undetachable from the support portion 341 . [Explanation of symbols]

[0193] 20,120…Marking 21,121…Ring body 22...Retaining member 23...First holding member 23a…Outer peripheral surface enlarged diameter part 23b…Outer circumferential surface reduced diameter part 23c…Inner peripheral surface enlarged diameter part 23d…Inner surface reduced diameter section 24…Claw part 25…Step 26...Second holding member 26a…Outer peripheral surface enlarged diameter part 26b…Outer circumferential surface reduced diameter part 27...Cyclic body 28…Lock piece 30…Jig 31...Jig body 35...Switching means 39... Urging member 40…Case 41...Tip 42…Lock surface 43…Main body 50…Bottom 51…Bottom wall 52...Peripheral wall 53...Cylinder part 54...Reference plane 55...legs 56…Holder jaw 56a…legs 56b...Claw part 57…Claw part 58…Unlocker claw 58a…legs 58b...Claw part 59…Claw part 60…Holder 61...Base cylinder 62...Expanded diameter part 63...Extending part 64…Ring claw 64a…Part 1 64b…Second part 64c...Claw part 65…Notch 66…Regulating protrusion 67…Engagement step 68…Notch 70…Pusher 70a...Abutment surface for reference surface 70b…Contact surface for long body 71…Base section 71a…Pipe compatible area 72...Protrusion for long body 72a…In-core compatible area 73…Spring protrusion 74...Connection part 80…Unrocker 81…Notch 82…Regulation protrusion 83...Ring claw 90...Long body 91…Pipe 92…Incore 93…In-core main body 94…Flange section 100...Pipe fittings 110…Covering material 128...Fitting member 230…Jig 240…Case 241…Bottom wall 242…Regulation rib 242a…Regulation protrusion 243…Guide rib 244…Side wall 245…Support hole 246...Front wall 247...Reference plane 248…Back wall 249…Through-hole recess 250…Partition wall 251...insertion recess 252…Front storage section 253...Front opening 254…Rear storage section 255…Rear opening 260…Pusher 261...Pressure wall 262…Side wall 263…Lock claw 264...Support recess 265...legs 266...Spring support part 270…Cover 271…Cover body 272... Rotating shaft 273…Lock claw 274…Guide rib 275…Containment recess 281...First biasing member 282...Second biasing member 330…Pipe cutter 340...cutting section 341...Support part 342…support surface 343…Relief groove 344…Main body handle 345…Recess 346…First engagement portion 347...Second engagement portion 350…Blade body 351…Tip 352…Blade handle 360...Connection shaft part 370...Holding part 371…Containment recess 372…Restriction hole 373…support surface 374…Side wall 375…Allowable recess 376…First engagement portion 377...Second engagement portion

Claims

1. The present invention is applied to a long body having a resin pipe and being inserted into a pipe joint, and is configured to be attached to the outer circumferential surface of the pipe. Marking.

2. an annular ring body into which the elongated body is inserted; a plurality of lock pieces extending from an inner peripheral edge of the ring body toward the inside in the radial direction of the ring body and arranged along the inner peripheral edge, the lock piece allows the elongated body to move toward one side in the axial direction of the ring body, while engaging with an outer peripheral surface of the pipe to prevent the elongated body from moving toward the other side in the axial direction. The marker according to claim 1 .

3. The lock pieces are inclined so as to be positioned toward one side in the axial direction as they become radially inward of the ring body. The marker according to claim 2 .

4. The ring body is a metal annular body press-formed integrally with the lock piece; a resin holding member that holds the annular body from an outer periphery side, A step portion is formed on the outer circumferential surface of the holding member. The marker according to claim 2.

5. A marking tool used to attach the marker according to any one of claims 1 to 4 to a position on the outer circumferential surface of the pipe at a predetermined distance from the tip surface of the elongated body, a jig body having an insertion space into which the elongated body is inserted and a reference surface provided in the insertion space to abut and regulate the insertion of the elongated body; a holder that holds the marker ring behind the reference plane in an insertion direction of the elongated body and allows the elongated body to be inserted into the marker ring; the holder can be switched between a locked state that prevents removal of the marker ring from the holder and an unlocked state that allows removal of the marker ring from the holder, and the holder is in the locked state while the elongated body is being inserted into the marker ring, and a switching means is provided that allows the holder to switch from the locked state to the unlocked state when the insertion of the elongated body is restricted by contact with the reference surface. Marking jig.

6. the holder is supported by the jig body so as to be slidable along the axial direction of the elongated body, The switching means is a ring claw formed on the holder for removably holding the marker ring by elastic engagement; a lock surface formed on the jig body and facing the ring claw as the holder slides; In the locked state, the locking surface faces the ring claw to restrict elastic deformation of the ring claw, thereby preventing the marker ring from being removed from the ring claw. In the unlocked state, the locking surface is displaced relative to the ring claw to allow elastic deformation of the ring claw, thereby allowing removal of the marker ring from the ring claw. The marking tool according to claim 5.

7. The switching means is A holder claw formed on the jig body; an engagement step formed on the holder, the engagement step engaging with the holder claw to prevent the holder from sliding relative to the jig body, thereby maintaining the locked state; an unlocker that is provided to be capable of sliding along the axial direction relative to the jig body, and that approaches the holder claw when pressed by the elongated body inserted into the insertion space of the jig body, and that, in a state in which the insertion of the elongated body is restricted by abutment against the reference surface, pushes the holder claw to elastically deform it, thereby releasing the engagement between the holder claw and the engagement step; and a biasing member that biases the unlocker in a direction away from the holder claw in the axial direction. The marking tool according to claim 6.

8. The switching means includes a pusher that is slidable in the axial direction relative to the jig body, The pusher is a reference surface abutment surface that faces the reference surface in the axial direction and abuts against the reference surface to restrict insertion of the elongated body; a contact surface for an elongated body, the contact surface being formed on the opposite side of the reference surface contact surface in the axial direction and contacting a tip end surface of the elongated body inserted into the insertion space; A coupling portion drivably coupled to the unlocker. The marking tool according to claim 7.

9. The biasing member is interposed between the jig body and the pusher in the axial direction, a gap that allows relative movement between the pusher and the unlocker is formed between the connection portion of the pusher and the unlocker in the locked state on a side opposite to the reference surface in the axial direction, The switching means is The jig body is provided with an unlocker claw that elastically engages with the unlocker in contact with the holder claw, thereby applying frictional resistance to the unlocker that slides in the axial direction away from the reference surface. The marking tool according to claim 8.

10. The elongated body is The pipe; an in-core having an in-core main body portion to be inserted into the pipe and a flange portion to be abutted against a tip end surface of the pipe, The contact surface for the elongated body of the pusher is an in-core corresponding region to which an end surface of the in-core is abutted; a pipe corresponding area against which the tip surface of the pipe without the in-core is abutted; The pipe corresponding area is located closer to the reference surface than the in-core corresponding area in the axial direction. The marking tool according to claim 8.

11. A marking tool used to attach a marker to an outer peripheral surface of an elongated body at a position a predetermined distance from a tip surface of the elongated body, a jig body having an insertion space into which the elongated body is inserted and a reference surface provided in the insertion space to abut and regulate the insertion of the elongated body; a holder that holds the marker ring behind the reference plane in an insertion direction of the elongated body and allows the elongated body to be inserted into the marker ring; the holder can be switched between a locked state that prevents removal of the marker ring from the holder and an unlocked state that allows removal of the marker ring from the holder, and the holder is in the locked state while the elongated body is being inserted into the marker ring, and a switching means is provided that allows the holder to switch from the locked state to the unlocked state when the insertion of the elongated body is restricted by contact with the reference surface. Marking jig.

12. A pipe cutter used for attaching the marker according to any one of claims 1 to 4 to a position on the outer circumferential surface of the pipe at a predetermined distance from the tip surface of the pipe, A holder for holding the marker; a cutting unit having a blade that cuts the pipe in a state where the pipe is inserted into the marker ring along a direction perpendicular to the axial direction of the pipe, The distance in the axial direction between the marker and the blade body when held by the holding portion is set to the predetermined distance. Pipe cutter.

13. The holding portion has an accommodating recess for accommodating the marker, The cutting portion is A support portion that supports an outer peripheral surface of the pipe; a blade handle portion that is fixed to the blade body and is rotatable with respect to the support portion about an axis parallel to the axial direction, and that rotates the blade body; 13. A pipe cutter according to claim 12.

Images