Marking jig

Abstract

To provide a marking tool capable of easily marking an appropriate cutting position of a pipe connected to an elbow pipe joint.SOLUTION: The marking jig 1 has an elbow-shaped outer shape in which the first linear part 3 and the second linear part 4 form the same angle as that of the elbow pipe joint 11 to which the pipe is to be connected, and includes a first recess 30 which is provided along the first linear part 3 in the first linear part 3 and along which a pipe having a length exceeding the second linear part 4 can also be placed, and a marking hole 33 which is provided in the first linear part 4 and through which the mark M is given to the pipe along the first recess 30.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a marking tool used to mark the appropriate cutting position on a pipe to be connected to an elbow fitting. [Background technology]

[0002] Patent Document 1 discloses a crank-shaped cold and hot water supply pipe that passes through external and internal corners. Such complex cold and hot water supply pipes require the use of numerous elbow joints, resulting in the pipes being cut into small pieces. Therefore, each pipe between each elbow joint must be cut to an accurate length. According to Patent Document 1, the pipe length can be calculated from the wall dimensions using the numerical values ​​displayed on the elbow joints. However, the method of calculating the pipe length requires time-consuming measurements of the wall dimensions and calculations, and there is also the possibility of measurement or calculation errors.

[0003] Patent Document 2 discloses a pipe fitting that is provided with a marking that indicates the position of the end face of the pipe to be connected. By using such a pipe fitting, the outer surface of the pipe fitting can be placed against an external or internal corner and the pipe placed there, thereby marking the cutting position. However, marking requires maintaining the proper positioning of the pipe fitting relative to the pipe and installation location, making the work complicated. Also, if the distance between the fitting marking and the pipe is large, the marking position may deviate from the appropriate cutting position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-157903 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-314762 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a marking tool that can easily mark an appropriate cutting position on a pipe to be connected to an elbow pipe fitting. [Means for solving the problem]

[0006] In order to achieve the above object, the marking jig of the invention of claim 1 is a marking jig used to mark the appropriate cutting position on a pipe to be connected to an elbow pipe fitting, and has an elbow-shaped outer shape in which a first straight portion and a second straight portion form the same angle as the elbow pipe fitting, and is equipped with a recess in the first straight portion along the first straight portion, which can accommodate pipes of a length longer than the second straight portion, and a guide portion in the first straight portion, which serves as a guide for marking the pipe along the recess.

[0007] The invention of claim 2 is the same as claim 1, in which the pipe is a first pipe and the recess is a first recess, and a second recess is provided along the second straight portion, along which a second pipe to be connected to the elbow pipe fitting can be aligned, and the second recess has a positioning surface that abuts and defines the second pipe so that the second pipe, when aligned along the second recess, does not go beyond the first straight portion.

[0008] The invention of claim 3 is the same as claim 1 or claim 2, in which the first straight portion and the second straight portion are each cylindrical, and the portion where the first straight portion and the second straight portion are connected to each other is open to the outside. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. [Figure 2] FIG. [Figure 3]FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 10 is a diagram showing a piping method, illustrating a step of marking a pipe using a marking jig. [Figure 9] FIG. 10 is a diagram illustrating a piping method, showing a step of cutting the pipe at the marked position. [Figure 10] FIG. 10 is a diagram illustrating a piping method, illustrating a step of marking another pipe using a marking jig attached to a cut pipe. [Figure 11] FIG. 2 is a diagram showing cold and hot water supply piping near an inside corner and an outside corner, with a portion of an elbow pipe fitting broken away. [Figure 12] FIG. 10 is a six-sided view showing another example of a marking jig (the back view is symmetrical to the front view). [Figure 13] FIG. 10 is a six-sided view showing another example of a marking jig (the back view is symmetrical to the front view). [Figure 14] 10A and 10B are six-sided views showing another example of a marking jig. [Figure 15] 10A and 10B are six-sided views showing another example of a marking jig. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, one embodiment of the marking jig of the present invention will be described.

[0011] <About hot and cold water supply piping> As shown in Figure 11, the installation target for the cold water and hot water supply piping consists of a first wall surface 101, a second wall surface 102, and a third wall surface 103, with the first wall surface 101 and the second wall surface 102 forming an inside corner 201 at a right angle, and the second wall surface 102 and the third wall surface 103 forming an outside corner 202 at a right angle.

[0012] The cold and hot water supply piping is installed along the first wall surface 101, the second wall surface 102, and the third wall surface 103, passing through an inside corner 201 and an outside corner 202. An elbow pipe fitting 11 is arranged at each of the inside corner 201 and the outside corner 202. The elbow pipe fitting 11 arranged at the inside corner 201 and the elbow pipe fitting 11 arranged at the outside corner 202 are connected to each other via a pipe 61B arranged on the second wall surface 102.

[0013] Pipe 61B and pipe 61A, which is disposed on first wall surface 101 and faces inside corner 201, are connected to each other via elbow fitting 11, which is disposed at inside corner 201. Pipe 61B and pipe 61C, which is disposed on third wall surface 103 and faces outside corner 202, are connected to each other via elbow fitting 11, which is disposed at outside corner 202.

[0014] The pipes 61A, 61B, and 61C are made of synthetic resin such as polyolefin (cross-linked polyethylene, polybutene, etc.), etc. The pipes 61A, 61B, and 61C are made of the same material and have the same dimensions.

[0015] <About elbow fittings> The elbow fitting 11 has two cylindrical main bodies 12. Pipes 61A, 61B, and 61C of the same dimensions (same nominal diameter) can be inserted and connected to each of the main bodies 12. Each main body 12 is made of a synthetic resin such as polyphenylene sulfide resin. The two main bodies 12 are integrally molded with cylindrical corner portions 13 interposed therebetween.

[0016] In this embodiment, these two main body portions 12 and corner portion 13 as a whole form the joint body, and in particular, one main body portion 12 forms one end of the joint body, and the other main body portion 12 forms the other end of the joint body.

[0017] In the elbow pipe joint 11, one main body 12 and the other main body 12 are arranged so that their axes L1, L2 are perpendicular to each other. The one main body 12 and the other main body 12 are the same (same dimensions, shape, etc.), and the one main body 12 and the other main body 12 form the same one-touch joint (same dimensions, shape, etc.).

[0018] A cylindrical inner core 62 is inserted into the ends of the pipes 61A, 61B, 61C that are connected to the one-touch couplings. The inner core 62 is prevented from sinking into the pipes 61A, 61B, 61C by a flange 62a formed at the end of the inner core 62. The inner core 62 is intended to increase the roundness of the ends of the pipes 61A, 61B, 61C and maintain that roundness.

[0019] An outer tube 14 is formed to protrude from the main body 12. An insertion space 15 is formed inside the outer tube 14 to allow insertion of the pipes 61A, 61B, and 61C. A step 14a is provided on the inner circumferential surface of the outer tube 14 toward the base end. A locking step 14b is provided on the inner circumferential surface of the outer tube 14 toward the tip end of the step 14a.

[0020] A positioning surface 14c is provided at the base end of the inner peripheral surface of the outer cylindrical portion 14, abutting against the tip surface of the inner core 62 to determine the insertion positions of the pipes 61A, 61B, 61C. The positioning surface 14c exists on an imaginary plane perpendicular to the axes L1, L2 of the corresponding main body portion 12. The distances from the intersection of the axis L1 of one main body portion 12 and the axis L2 of the other main body portion 12 to the positioning surface 14c in the directions of the corresponding axes L1, L2 are the same, "x1."

[0021] A seal ring holder 16 made of polyacetal resin is engaged with the engagement step 14b. Two seal rings 17 made of rubber such as ethylene-propylene-diene copolymer rubber are arranged at a distance between the seal ring holder 16 and the step 14a. A spacer ring 18 is arranged between the two seal rings 17.

[0022] When the pipes 61A, 61B, and 61C are inserted into the insertion space 15, the seal ring 17 is crushed between the outer surfaces of the pipes 61A, 61B, and 61C and the inner surface of the outer tube portion 14 and pressed against both surfaces, thereby ensuring watertightness between the two surfaces.

[0023] The elbow fitting 11 includes a pair of retaining mechanisms 20 for holding the pipes 61A, 61B, and 61C to the respective main bodies 12, and a pair of caps 21 for attaching the retaining mechanisms 20 to the respective main bodies 12. The caps 21 are made of synthetic resin such as polyphenylene sulfide resin.

[0024] Each cap 21 has a portion that has the maximum outer diameter centered on the corresponding axis L1, L2 in the elbow fitting 11, in other words, a portion that abuts against the installation surface (first wall surface 101, second wall surface 102, third wall surface 103) when the elbow fitting 11 is installed in the inside corner 201 or the outside corner 202. Hereinafter, this portion will be referred to as the "maximum outer diameter portion 21a."

[0025] The inner peripheral surface of the tip of the cap 21 is provided with an inclined surface 21b that tapers in diameter toward the tip. Two locking grooves 21c are formed on the inner peripheral surface of the cap 21. Two locking ridges 14d are formed on the outer peripheral surface of the outer tube portion 14. The cap 21 is fitted onto the outer tube portion 14, and is connected to the outer tube portion 14 by snap-engaging the locking grooves 21c with the locking ridges 14d of the outer tube portion 14.

[0026] The cap 21 has a pipe insertion opening 21d that communicates with the insertion space 15. The distance in the direction of the axis L1 from the positioning surface 14c of one body portion 12 to the pipe insertion opening 21d of the cap 21 that corresponds to that body portion 12 is the same as the distance in the direction of the axis L2 from the positioning surface 14c of the other body portion 12 to the pipe insertion opening 21d of the cap 21 that corresponds to that body portion 12, and is "x2."

[0027] The lock ring 22 that constitutes the retaining mechanism 20 is made of a thin metal plate such as stainless steel and has an annular shape. A plurality of retaining pieces 22a are formed on the inner periphery of the lock ring 22, protruding and inclined toward the inner end. A split ring 23 that constitutes the retaining mechanism 20 is interposed between the lock ring 22 and the cap 21. The split ring 23 is made of a synthetic resin such as polyphenylene sulfide resin. The split ring 23 backs up and maintains the inclination angle of the retaining pieces 22a of the lock ring 22.

[0028] A lock ring holder 24, which constitutes the retaining mechanism 20, is sandwiched between the seal ring holder 16 and the cap 21. A lock ring 22 is sandwiched between the lock ring holder 24 and the split ring 23.

[0029] Suppose that a pulling force acts on the pipes 61A, 61B, 61C that have been inserted into the insertion space 15 and through which the split ring 23 and lock ring 22 have been inserted. In this case, the retaining pieces 22a of the lock ring 22 bite into the outer peripheral surfaces of the pipes 61A, 61B, 61C, preventing the pipes 61A, 61B, 61C from coming out of the elbow pipe fitting 11. In this case, the split ring 23 is guided by the inclined surface 21b of the cap 21 to reduce its diameter and tighten the outer peripheral surfaces of the pipes 61A, 61B, 61C, preventing the pipes 61A, 61B, 61C from coming out of the elbow pipe fitting 11.

[0030] It should be noted that with regard to elbow fittings 11 into which pipes 61A, 61B, 61C have been inserted and connected, it is prohibited to pull out the pipes 61A, 61B, 61C and then reuse them, as there is a concern that the anti-slip function may be reduced due to excessive deformation of the lock ring 22, etc.

[0031] <About marking jigs> 1 to 7, the marking jig 1 includes a cylindrical first linear portion 3, a bottomed cylindrical second linear portion 4, and a portion (connecting portion 5) where the first linear portion 3 and the second linear portion 4 are connected to each other. The first linear portion 3 and the second linear portion 4 are arranged so that their axes L3, L4 are perpendicular to each other and form the same angle as the two main body portions 12 of the elbow pipe fitting 11 (see FIG. 11), and have an elbow-shaped outer shape.

[0032] The marking jig 1 is integrally molded from a synthetic resin material such as polypropylene. The connecting portion 5 has a cylindrical outer shape that is curved in an arc shape and has the same outer diameter as the corner portion 13 of the elbow pipe fitting 11 (see Figure 11).

[0033] The first linear portion 3 and the second linear portion 4 have portions (maximum outer diameter portions 32, 42) with the maximum outer diameter centered on the corresponding axis L3, L4, respectively. The maximum outer diameter portions 32, 42 of the marking jig 1 are located at the same position and have the same outer diameter as the maximum outer diameter portion 21a of the elbow pipe fitting 11 (see FIG. 11).

[0034] The inner diameters of the first straight portion 3 and the second straight portion 4 correspond to the outer diameters of the pipes 61A, 61B, and 61C. The inner peripheral surface of the first straight portion 3 forms a first recess 30, and the inner peripheral surface of the second straight portion 4 forms a second recess 40.

[0035] The first recess 30 is formed to penetrate the first linear portion 3 in the direction of the axis L3. The first recess 30 opens the connecting portion 5 outward. The pipes 61A, 61B, 61C can be arranged to penetrate the first linear portion 3 along the first recess 30. The intersection of the outer surface of the cylindrical connecting portion 5 curved in an arc and the linear first recess 30 forms an opening edge 31 of the first recess 30 in the connecting portion 5, and the opening edge 31 is curved in a front view.

[0036] The first linear portion 3 has a pair of guide portions (marking holes 33) that serve as guides for marking appropriate cutting positions on the pipes 61A, 61B, 61C. The marking holes 33 are formed to penetrate the first linear portion 3 in the radial direction and open to the first recessed portion 30. The marking holes 33 are elongated holes that extend in the circumferential direction, and two of them are formed at equal intervals in the circumferential direction.

[0037] 7, the distance in the direction of axis L3 from the intersection of axis L3 and axis L4 to marking hole 33 is "x1+v," which is the sum of the distance "x1" in elbow pipe fitting 11 (see FIG. 11) and the thickness "v" of flange 62a of incore 62. This distance "x1+v" is the distance in the direction of each of the corresponding axes L1 and L2 from the intersection of axis L1 and axis L2 in elbow pipe fitting 11 to the end faces of pipes 61A, 61B, and 61C connected to elbow pipe fitting 11.

[0038] The distance from the end face 44 of the first straight portion 3 opposite the connecting portion 5 to the marking hole 33 is "x2-v," which is obtained by subtracting "v" by the thickness of the flange 62a of the incore 62 from "x2" in the elbow pipe fitting 11 (see FIG. 11). The distance "x2-v" is the distance in the direction of each corresponding axis L1, L2 from the pipe insertion opening 21d of the cap 21 corresponding to each main body 12 in the elbow pipe fitting 11 to the end face of each pipe 61A, 61B, 61C connected to each main body 12 (insertion depth of the pipes 61A, 61B, 61C into the one-touch fitting).

[0039] The pipes 61A, 61B, and 61C can be inserted into and aligned with the second recess 40. The bottom surface of the second recess 40 functions as a positioning surface 41. The end faces of the pipes 61A, 61B, and 61C aligned with the second recess 40 abut against the positioning surface 41. This abutment prevents the pipes 61A, 61B, and 61C aligned with the second recess 40 from exceeding the first linear portion 3.

[0040] The distance in the direction of axis L4 from the intersection of axis L3 and axis L4 to positioning surface 41 is "x1+v," which is the sum of the distance "x1" in elbow pipe fitting 11 (see FIG. 11) and the thickness "v" of flange 62a of incore 62. This distance "x1+v" is the distance in the direction of each of the corresponding axes L1 and L2 from the intersection of axis L1 and axis L2 in elbow pipe fitting 11 to the end faces of pipes 61A, 61B, and 61C connected to elbow pipe fitting 11.

[0041] The distance from the end face 44 of the second straight portion 4 opposite the connecting portion 5 to the positioning surface 41 is "x2-v," which is obtained by subtracting "v" by the thickness of the flange 62a of the incore 62 from "x2" in the elbow pipe fitting 11 (see FIG. 11). The distance "x2-v" is the distance in the direction of each corresponding axis L1, L2 from the pipe insertion opening 21d of the cap 21 corresponding to each main body 12 in the elbow pipe fitting 11 to the end face of each pipe 61A, 61B, 61C connected to each main body 12 (insertion depth of the pipes 61A, 61B, 61C into the one-touch fitting).

[0042] As shown in FIGS. 1 to 7 , confirmation windows 43 are provided in the second straight portion 4 near the positioning surface 41. The confirmation windows 43 are formed radially through the second straight portion 4 and open to the second recess 40. The confirmation windows 43 are elongated holes extending in the circumferential direction, and two confirmation windows 43 are formed at equal intervals in the circumferential direction. The confirmation windows 43 are provided in positions where the positioning surface 41 can be easily viewed from the outside. Therefore, by looking through the confirmation windows 43, an operator can easily check the state of contact between the ends of the pipes 61A, 61B, 61C that are aligned with the second recess 40 and the positioning surface 41.

[0043] <Piping method> 8, pipe 61A, which is arranged on first wall surface 101 and faces inside corner 201, is connected to one of the one-touch fittings of elbow fitting 11, which is arranged at inside corner 201. One end of pipe 61B, which is arranged on second wall surface 102, is connected to the other one-touch fitting of elbow fitting 11.

[0044] The pipe 61B is cut out from a long pipe so that its length is longer than the distance between the inside corner 201 and the outside corner 202. With one end of the pipe 61B connected to the elbow fitting 11, the other end extends beyond the outside corner 202.

[0045] To mark the appropriate cutting position on the pipe 61B placed on the second wall surface 102 using the marking jig 1, the pipe 61B is inserted through the first recess 30 of the first straight portion 3 from the end face 34 side, and the maximum outer diameter portion 42 of the second straight portion 4 is brought into contact with the third wall surface 103. At this time, the maximum outer diameter portion 32 of the first straight portion 3 is brought into contact with the second wall surface 102.

[0046] In this state, a marker is placed on the pipe 61B through the marking hole 33 of the first linear portion 3 and moved circumferentially along the marking hole 33 to provide a mark M. Alternatively, a marker may be placed on the pipe 61B at the end face 34 and moved circumferentially to mark the insertion depth.

[0047] Furthermore, when performing the marking work, the marking jig 1 is supported by the pipe 61B, the second wall surface 102, and the third wall surface 103, so the worker does not need to hold the marking jig 1 in his or her hands, making the marking work easier.

[0048] 9, the marking jig 1 is removed from the pipe 61B, and the pipe 61B is cut at the position of the mark M. When the elbow fitting 11 is connected to the cut pipe 61B, each maximum outer diameter portion 21a of the elbow fitting 11 comes into contact with the corresponding installation surface (the second wall surface 102 and the third wall surface 103), and installation of the pipe 61B and the elbow fitting 11 at the projected corner 202 is completed.

[0049] Also, as shown in Figure 10, before connecting the pipe 61B cut at the appropriate position to the elbow pipe fitting 11, if a mark is to be added to the pipe 61C positioned on the third wall surface 103 and heading toward the corner 202 to indicate the appropriate cutting position, the pipe 61C is placed through the first recess 30 of the first straight portion 3 of the marking jig 1 from the end face 34 side.

[0050] Next, the pipe 61B is inserted into the second recess 40 of the second straight portion 4. At this time, it is easy to visually check through the confirmation window 43 whether the pipe 61B has been securely inserted into the marking jig 1 up to the position of the positioning surface 41. When the pipe 61B has been inserted into the marking jig 1 up to the position of the positioning surface 41, the maximum outer diameter portion 32 of the first straight portion 3 abuts against the third wall surface 103, and the maximum outer diameter portion 42 of the second straight portion 4 abuts against the second wall surface 102.

[0051] Then, the mark M is applied to the pipe 61C in the same manner as described above. Note that, by inserting the pipe 61B into the second recess 40 of the second linear portion 4, the marking jig 1 can be prevented from rotating around the axis L3, and the marking work can be performed stably.

[0052] As described above, before the pipes 61A, 61B, 61C are cut at the appropriate positions, the marks M can be easily placed at the appropriate cutting positions by aligning the pipes 61A, 61B, 61C with the marking jig 1. Therefore, there is no need to take the time to measure the wall dimensions or perform calculations to calculate the pipe length.

[0053] Furthermore, since the outer shape of the marking jig 1 imitates the elbow pipe fitting 11, during the marking work, it is easy to grasp the positional relationship between the cutting position of the pipes 61A, 61B, 61C and the elbow pipe fitting 11 to be connected to the cut pipes 61A, 61B, 61C.

[0054] (Another example) The above embodiment can be modified, for example, as follows. The outer shape of the marking jig 1 may be made to resemble a T-shaped tee pipe joint. In this case, the marking jig 1 may be made to have a T-shape that is line-symmetrical with respect to the axis L3 and have second recesses 40 at both ends of the second linear portion 4, or may be made to have a T-shape that is line-symmetrical with respect to the axis L4 and have marking holes 33 on both sides of the axis L4.

[0055] The marking jig 1 is used when piping the inside corner 201. In this case, the pipes 61A, 61B, 61C to be aligned with the first recess 30 of the first linear portion 3 are cut out from a long pipe so as not to interfere with the inside corner 201.

[0056] ○Omit the confirmation window 43.

[0057] This can be used for piping that does not pass through outside corners 202 and inside corners 201, i.e., piping that changes direction on a flat surface using an elbow pipe fitting 11. For example, if the piping is covered with a piping protection cover that has a base and a cover that is attached to the base, the marking jig 1 may be aligned with the base that is attached to the construction surface first.

[0058] As shown in Figure 12, the connecting portion 5 may be extended cylindrically in the direction of the axis L3. In this case, the strength of the connecting portion 5 is increased. Furthermore, the first recess 30 of the first linear portion 3 is extended, allowing the pipes 61A, 61B, and 61C to be positioned more stably. The length of the extension is preferably such that the end face of the connecting portion 5 in the extension direction does not exceed the second linear portion 4 when viewed from the left side.

[0059] 13, the first linear portion 3 may be semi-cylindrical. In this case, the pipes 61A, 61B, and 61C can be placed along the first recess 30 of the first linear portion 3 in a direction perpendicular to the axis L3, making the work easier, even when there is limited space at the installation site. The opening of the semi-cylindrical portion 3 is preferably located on the opposite side to the second linear portion 4.

[0060] As shown in Figure 14, the first linear portion 3 may be made up of two semi-cylindrical members. Furthermore, the two members may be connected via a hinge portion so as to be openable and closable.

[0061] 15, the configuration of the first straight portion 3 is also applied to the second straight portion 4, and the first straight portion 3 and the second straight portion 4 are arranged so that their respective axes L3 and L4 are twisted. In this case, for example, by aligning two pipes 61B and 61C heading toward the external corner 202 along the first straight portion 3 and the second straight portion 4, respectively, it is possible to simultaneously provide the mark M on the pipes 61B and 61C. [Explanation of symbols]

[0062] 1...marking jig, 3...first linear portion, 30...first recess, 31...opening edge, 32...maximum outer diameter portion, 33...guide portion (marking hole), 34...end surface, 4...first linear portion, 40...second recess, 41...positioning surface, 42...maximum outer diameter portion, 43...inspection window, 44...end surface, 5...connecting portion. 11...pipe fitting, 12...main body portion, 13...corner portion, 14...outer tube portion (a...step portion, b...locking step, c...positioning surface, d...locking ridge), 15...insertion space, 16...seal ring holder, 17...seal ring, 18...spacer ring. 20...anti-slip mechanism, 21...cap (a...maximum outer diameter portion, b...inclined surface, c...locking groove, d...pipe insertion port), 22...lock ring (a...anti-slip piece), 23...split ring, 24...lock ring retainer. 61A, 61B, 61C...pipe, 62...in-core (a...flange). 101...first wall, 102...second wall, 103...third wall. 201...inside corner, 202...outside corner.

Claims

1. A marking tool used to mark the appropriate cutting position on a pipe to be connected to an elbow pipe fitting, A marking jig having an elbow-shaped outer shape in which a first straight portion and a second straight portion form the same angle as the elbow pipe fitting, and having a recess provided along the first straight portion in order to accommodate a pipe of a length longer than the second straight portion, and a guide portion provided on the first straight portion as a guide for applying the mark to the pipe along the recess.

2. 2. The marking jig of claim 1, wherein the pipe is a first pipe and the recess is a first recess, the second linear portion is provided with a second recess along which a second pipe to be connected to the elbow pipe fitting can be aligned, and the second recess has a positioning surface that abuts and defines the second pipe so that the second pipe aligned with the second recess does not exceed the first linear portion.

3. 3. The marking jig according to claim 1, wherein the first linear portion and the second linear portion are each cylindrical, and the portion where the first linear portion and the second linear portion are connected to each other is open outward.

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