Flange mating jig

Abstract

To provide a flange mating jig which can readily correct a positional deviation of a bolt fastening hole of a flange part of a pipe.SOLUTION: A flange mating jig includes an elongated arm part, and an elongated positional mating part extending from an end part of the arm part and intersecting with an axis line of the arm part. An angle between the arm part and the positional mating part is 90° or more and 120° or less, more favorably, 95° or more and 115° or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a flange alignment jig. [Background technology]

[0002] In industrial facilities and the like, piping having flange portions is used to connect one pipe, through which a gaseous or liquid working fluid flows, to another pipe or the like with bolts or the like. The piping has a piping portion through which the working fluid flows and a flange portion for fixing the piping to the other pipe or the like. The flange portion is disk-shaped and has a plurality of bolt fastening holes in the circumferential direction for fixing the piping to the other pipe or the like. When fixing one pipe to the other pipe, the positions of the bolt fastening holes in one flange portion may be misaligned in the circumferential direction or radial direction relative to the positions of the bolt fastening holes in the other flange portion, and it may be necessary to correct this misalignment.

[0003] Patent Document 1 discloses a flange alignment jig for correcting misalignment when the positions of bolt fastening holes in one flange portion are misaligned circumferentially or radially relative to the positions of bolt fastening holes in the other flange portion. The flange alignment jig includes a tapered bolt hole guide portion that is inserted into two misaligned bolt fastening holes, a bolt hole alignment portion that corrects the misalignment of the bolt holes, a cylindrical portion extending from the bolt hole alignment portion, and a striking portion at the upper end of the cylindrical portion. With this flange alignment jig, the misalignment of the bolt fastening holes is corrected by inserting the bolt hole guide portion into the bolt fastening holes in the flange portions and striking the striking portion with a hammer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-92957 Summary of the Invention [Problem to be solved by the invention]

[0005] The flange alignment jig described in Patent Document 1 requires a separate hammer to strike the flange alignment jig to correct misalignment of the bolt fastening holes, making the process complicated. Furthermore, when correcting misalignment by rotating the cylindrical portion using the principle of leverage without using a hammer, the angle between the cylindrical portion and the bolt hole guide portion and bolt hole alignment portion is close to 180°, which means that the handle may come into contact with the piping. As a result, correcting misalignment of the bolt fastening holes in the flanges is difficult.

[0006] The object of the present invention is to provide a flange alignment jig that can easily correct misalignment of bolt fastening holes. [Means for solving the problem]

[0007] The present disclosure provides: A long arm portion, an elongated alignment portion extending from an end of the arm portion and intersecting an axis of the arm portion; It is equipped with The angle between the arm portion and the alignment portion is greater than 90° and less than or equal to 120°. To provide a flange alignment jig.

[0008] With the flange alignment jig according to the present disclosure, the angle between the arm and the alignment portion is greater than 90° and less than or equal to 120°, so when the alignment portion is inserted into the bolt fastening hole of the flange and the arm portion is rotated toward the piping portion, the handle of the arm portion does not come into contact with the piping portion, and misalignment of the bolt fastening hole can be corrected by the principle of leverage, making it easy to align the misalignment of the bolt fastening hole. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a side view of the flange alignment jig according to the embodiment. [Figure 2] FIG. 2 is an enlarged front view of the flange alignment jig according to the embodiment. [Figure 3]1 is a vertical cross-sectional view showing a state in which the flange alignment jig according to the present embodiment is inserted into the bolt fastening holes of two pipes whose bolt fastening holes are misaligned. FIG. [Figure 4] 10 is a vertical cross-sectional view showing a state in which misalignment of bolt fastening holes in a pipe has been corrected by the flange alignment jig according to the present embodiment. FIG. [Figure 5] 10 is a top view showing a state in which bolt fastening holes of a pipe in which the flange alignment jig according to the present embodiment is used are misaligned in the circumferential direction. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] First, a description will be given of a pipe in which the flange alignment jig of the present disclosure is used.

[0011] The pipes 100, 200 shown in Figures 3 and 4 are typical flanged pipes having a flange portion 101, 201 fastened and fixed on one side and a pipe portion 102, 202 through which a gaseous or liquid working fluid flows. The flange portion 101, 201 is disk-shaped with a predetermined outer diameter and thickness. The flange portion 101, 201 has a plurality of bolt fastening holes 101a, 201a formed circumferentially therethrough, penetrating in the thickness direction, and further has a passage at the center for the working fluid to flow from the pipe portion 102, 202. The pipe portion 102, 202 is cylindrical with a predetermined outer diameter and thickness and is joined to the center of the flange portion 101, 201 by welding. Note that the pipes used may be free flanges in which the pipe portion and the flange portion are not joined by welding.

[0012] The flange alignment jig of the present disclosure is intended to be used primarily to correct misalignment of bolt fastening holes in flanges of piping of a size where manual correction of misalignment of bolt fastening holes in the flanges is difficult. The flange alignment jig of the present disclosure is preferably used for piping 100, 200 of a size in which, for example, the outer diameter of flanges 101, 201 is 125 mm to 675 mm, the thickness of flanges 101, 201 is 14 mm to 30 mm, the inner diameter of bolt fastening holes 101 a, 201 a is 19 mm to 27 mm, and the outer diameter of piping sections 102, 202 is 34 mm to 508 mm.

[0013] For example, in FIG. 3 , the first pipe 100 is arranged so that the flange portion 101 of the first pipe 100 faces the flange portion 201 of the second pipe 200. The position of the bolt fastening hole 101a of the first pipe 100 is shifted in the radial and / or circumferential directions relative to the position of the bolt fastening hole 201a of the second pipe 200. The two bolt fastening holes 101a, 201a partially overlap in the radial and / or circumferential directions when viewed from above. Such misalignment can occur due to external factors such as deformation of the pipe portions, even if the piping of the equipment is installed according to the design drawings. The flange alignment jig of the present disclosure can be used to correct such misalignment.

[0014] Next, a flange alignment jig 1 according to an embodiment of the present disclosure will be described with reference to FIG.

[0015] FIG. 1 shows a flange alignment jig 1 according to this embodiment. In FIG. 1, the vertical direction is the X direction, the diagonal direction diagonally upward to the right is the Y direction, and the upper side, lower side, diagonally upward right side, and diagonally downward left side are referred to as the X1 side, X2 side, Y1 side, and Y2 side, respectively. The flange alignment jig 1 includes a long arm portion 11 extending in the X direction, a long alignment portion 10 extending from the X1-side end of the arm portion 11 to the Y2 side and intersecting the axis of the arm portion 11, and a chisel portion 12 extending from the X2-side end of the arm portion 11 (i.e., the end opposite the X1-side end) to the X2 side. In this embodiment, the arm portion 11 and the alignment portion 10, and the arm portion 11 and the chisel portion 12 are joined by welding.

[0016] The arm portion 11 is a handle portion when using the flange alignment jig 1. For this reason, the arm portion 11 has a columnar / cylindrical shape that is easy to hold in the hand. The arm portion 11 has two columnar solid portions 11b located on the X1 side and the X2 side, respectively, and a cylindrical hollow portion 11a located between the two solid portions 11b. Each solid portion 11b and hollow portion 11a are joined by welding. In this embodiment, the solid portion 11b and hollow portion 11a have approximately the same outer diameter of approximately 25 mm to 35 mm.

[0017] The length of hollow portion 11a in the X direction is longer than the solid portions 11b at both ends, i.e., the total length of the two solid portions 11b in the X direction. Increasing the length of hollow portion 11a prevents an increase in the weight of arm portion 11. In this embodiment, hollow portion 11a has a thickness of 2.5 mm to 4.5 mm.

[0018] The material of the arm portion 11 is preferably lightweight, rigid, and has properties suitable for welding. For example, the material of the arm portion 11 in this embodiment may be steel, stainless steel, titanium, or the like.

[0019] The alignment portion 10 is inserted into a bolt fastening hole in the pipe to correct misalignment of the bolt fastening hole in the pipe. The alignment portion 10 is shaped like a truncated cone whose outer diameter continuously decreases toward the Y1 side. The alignment portion 10 has a bolt fastening hole insertion portion 10a that is inserted into the bolt fastening hole in the pipe, a connecting portion 10b that is connected to the arm portion 11, and an extension portion 10c that extends from the connecting portion 10b toward the Y2 side. The bolt fastening hole insertion portion 10a, the connecting portion 10b, and the extension portion 10c are integrally and continuously formed.

[0020] The outer diameter of the alignment portion 10 can be selected appropriately depending on the inner diameter of the bolt fastening hole of the piping in which the flange alignment jig 1 is used (see FIG. 3). If the outer diameter of the alignment portion is too small, the alignment portion can be easily inserted into the bolt fastening hole of the piping, but the rigidity of the alignment portion will be weakened, which may cause the alignment portion to deform when correcting misalignment of the bolt fastening hole of the piping. On the other hand, if the outer diameter of the alignment portion is too large, the rigidity of the alignment portion will be increased, but it may not be easy to insert the alignment portion into the bolt fastening hole of the piping.

[0021] In the alignment portion 10 of this embodiment, the outer diameter of the Y1 side end of the bolt fastening hole insertion portion 10a is set between 10 mm and 13 mm, and the outer diameter of the alignment portion 10 at the boundary between the bolt fastening hole insertion portion 10a and the connecting portion 10b, i.e., the point where the arm portion 11 is joined, is set between 21 mm and 30 mm.

[0022] The angle A between the alignment portion 10 and the arm portion 11 is set in the range of greater than 90° and less than or equal to 120°. Within the above angle range, the angle A can be appropriately selected depending on the outer diameter of the flange portion and the outer diameter of the piping portion (see FIG. 3) in which the flange alignment jig 1 is used.

[0023] The length L2 in the Y direction of the bolt fastening hole insertion portion 10a can be appropriately selected depending on the outer diameter and thickness (see FIG. 3) of the flange portion to which the flange alignment jig 1 is to be used. In this embodiment, the length L2 is set in the range of 100 mm to 180 mm.

[0024] The material of the alignment portion 10 is preferably lightweight, rigid, and has properties suitable for welding. For example, the material of the alignment portion 10 in this embodiment may be steel, stainless steel, titanium, or the like. Furthermore, the alignment portion 10 may be subjected to a hardening process to further increase its rigidity.

[0025] The flange alignment jig 1 connects the extension portion 10c of the alignment portion 10 to the arm portion 11 and further includes a rib 13 for reinforcing the strength of the flange alignment jig 1. The rib 13 is located between the extension portion 10c and the solid portion 11b of the arm portion 11, which is joined to the alignment portion 10, and is joined to the extension portion 10c and the solid portion 11b by welding. In FIG. 1, the rib 13 is shaped like a triangular plate, two of whose sides are joined to the extension portion 10c and the solid portion 11b, respectively.

[0026] FIG. 2 is an enlarged view of the chisel portion 12 in the front view of the flange alignment jig 1. The chisel portion 12 has a rectangular portion 12a with a thickness of approximately 2 mm at its tip and a transitional portion 12b between the rectangular portion 12a and the solid portion 11b of the arm portion 11. The chisel portion 12 is used, for example, to insert a gasket between two flange portions whose surfaces are aligned, by inserting the rectangular portion 12a into the gap between the two flange portions to expand the gap. The chisel portion 12 extends along the axis of the arm portion 11. The thickness of the chisel portion 12 (rectangular portion 12a and transitional portion 12b) decreases toward the tip on the X2 side. The rectangular portion 12a has a rectangular cross-sectional shape. As shown in FIG. 1, the width of the rectangular portion 12a (the dimension perpendicular to the thickness) increases toward the tip on the X2 side. The cross section of the transition portion 12b at the portion where it is joined to the solid portion 11b of the arm portion 11 is approximately circular, and the cross-sectional shape of the transition portion 12b gradually changes from circular to rectangular as it approaches the rectangular portion 12a.

[0027] The total length L1 of the arm portion 11 and the chisel portion 12 in the first direction can be appropriately selected depending on the height of the user, the environment in which the piping is installed, the size of the piping, etc. In this embodiment, the length L1 is 500 mm to 1000 mm.

[0028] Next, a method for correcting misalignment of bolt fastening holes in piping using the flange alignment jig 1 of this embodiment will be described with reference to FIGS.

[0029] 3 and 4 show the flange alignment jig 1 of this embodiment and two pipes 100 and 200. Fig. 3 shows a vertical cross-sectional view of the state in which the flange alignment jig 1 is inserted into the bolt fastening holes 101a and 201a of the two pipes 100 and 200, the bolt fastening holes of which are misaligned.

[0030] In FIG. 3, the alignment portion 10 of the flange alignment jig 1 is inserted into the bolt fastening hole 101a of the first pipe 100 from the pipe portion 102 side of the first pipe 100, and is inserted up to the bolt fastening hole 201a of the second pipe 200.

[0031] Since the outer diameter of the Y1 side end of the bolt fastening hole insertion portion 10a of the alignment portion 10 of this embodiment is set between 10 mm and 13 mm, the alignment portion 10 can be easily inserted into the overlapping area of ​​the two bolt fastening holes 101a, 201a.

[0032] When the alignment part 10 is inserted, the alignment part 10 comes into contact with the wall surface of the bolt fastening hole 101a of the first pipe 100 and the wall surface of the bolt fastening hole 201a of the second pipe 200. With the alignment part 10 in contact with the wall surface of each of the bolt fastening holes 101a, 201a, when the arm part 11 of the flange alignment jig 1 is rotated in a direction toward the pipe part 102 of the first pipe 100 (clockwise direction R1 in FIG. 3 ) or in the opposite direction (counterclockwise direction R2 in FIG. 3 ) with each of the contact points P1, P2 as a fulcrum or point of application, each of the pipes 100, 200 moves in a direction corresponding to the rotation direction of the flange alignment jig 1 by the principle of leverage, and the misalignment of the bolt fastening holes 101a, 201a is corrected.

[0033] When alignment portion 10 is rotated, it receives a load from contact points P1 and P2 in the direction opposite to the direction of rotation, and if alignment portion 10 does not have sufficient rigidity, alignment portion 10 may deform. In flange alignment jig 1 of this embodiment, the outer diameter at the boundary between bolt fastening hole insertion portion 10a and connecting portion 10b is set to between 21 mm and 30 mm, so that the rigidity of alignment portion 10 can be maintained and deformation of alignment portion 10 can be suppressed.

[0034] As described above, when the alignment portion 10 receives a load from contact points P1 and P2 when the alignment portion 10 is rotated, stress concentrates at the joint between the alignment portion 10 and the arm portion 11, potentially causing the joint to come loose. Furthermore, the longer the distance from contact points P1 and P2 to the joint, the greater the stress at the joint. The flange alignment jig 1 of this embodiment is provided with a rib 13 that connects the extension portion 10c of the alignment portion 10 to the arm portion 11. The rib 13 can prevent the joint from coming loose due to rotation of the alignment portion 10. Furthermore, the second-direction length L2 of the bolt fastening hole insertion portion 10a is 100 mm to 180 mm, thereby reducing the stress concentrated at the joint.

[0035] If the angle A between the arm portion 11 and the alignment portion 10 is 90° or less, when the alignment portion 10 is inserted into the bolt fastening hole 101a and the flange alignment jig 1 is rotated in the counterclockwise direction R2, the arm portion 11 may abut against the flange portion 101 before the misalignment of the bolt fastening holes 101a, 201a is corrected, and the flange alignment jig 1 may not be able to be rotated further. In the flange alignment jig 1 of this embodiment, the angle A is set to be greater than 90°, so that the arm portion 11 can be prevented from abutting against the flange portion 101 when the flange alignment jig 1 is rotated in the counterclockwise direction R2. Note that if the angle A is 95° or greater, such abutment can be prevented even for pipes of various sizes. If the angle A is 100° or greater, such abutment can be prevented even for pipes of even greater sizes.

[0036] If the angle A between the arm portion 11 and the alignment portion 10 is greater than 120°, when the alignment portion 10 is inserted into the bolt fastening hole 101a and the flange alignment jig 1 is rotated in the clockwise direction R1, the arm portion 11 may abut against the pipe portion 102 of the first pipe 100 before the misalignment of the bolt fastening holes 101a, 201a is corrected, and the flange alignment jig 1 may not be able to be rotated further. In the flange alignment jig 1 of this embodiment, the angle A is set to 120° or less, so that the arm portion 11 can be prevented from abutting against the pipe portion 102 of the first pipe 100 when the flange alignment jig 1 is rotated. Note that when the angle A is 115° or less, such abutment can be prevented even for pipes of various sizes. When the angle A is 110° or less, such abutment can be prevented even for pipes of an even greater variety of sizes.

[0037] That is, by setting angle A to be greater than 90° and equal to or less than 120°, arm portion 11 is prevented from coming into contact with flange portions 101, 201 and piping portions 102, 202. To prevent contact with piping of various sizes, angle A is preferably equal to or greater than 95° and equal to or less than 115°, and more preferably equal to or greater than 100° and equal to or less than 110°.

[0038] In the flange alignment jig 1 of this embodiment, the total length L1 in the first direction of the arm portion 11 and the chisel portion 12 is 500 mm to 1000 mm, so that the effect of the principle of leverage can be effectively utilized and misalignment of the bolt fastening holes can be corrected with less force.

[0039] 4 shows a state in which the misalignment of the bolt fastening holes 101a, 201a has been corrected. The flange alignment jig 1 is still inserted into the bolt fastening holes 101a, 201a. With the flange alignment jig 1 inserted into the bolt fastening holes 101a, 201a, the two pipes 100, 200 are fixed to each other by fastening bolts and nuts into the bolt fastening holes 101a, 201a into which the other flange alignment jig 1 has not been inserted. The flange alignment jig 1 is then removed from the bolt fastening holes 101a, 201a, and the bolt fastening holes 101a, 201a into which the flange alignment jig 1 was inserted are then fastened with bolts and nuts.

[0040] FIG. 5 shows a top view of the two pipes 100, 200 shown in FIGS. 3 and 4. In FIG. 5, the positions of the bolt fastening holes 101a, 201a of the two pipes 100, 200 are misaligned only in the circumferential direction. When such misalignment occurs, the misalignment can be corrected by inserting the alignment portion 10 of the flange alignment jig 1 into the bolt fastening holes 101a, 201a and rotating it, for example, in the clockwise direction R3 or counterclockwise direction R4 in FIG. 5. In other words, the flange alignment jig 1 according to this embodiment can be suitably used even when the positions of the bolt fastening holes 101a, 201a are misaligned only in the circumferential direction.

[0041] The flange alignment jig 1 according to this embodiment has the following advantages.

[0042] (1) Flange alignment jig 1 is A long arm portion 11, an elongated alignment portion 10 extending from the end of the arm portion 11 and intersecting the axis of the arm portion 11; It is equipped with The angle A between the arm portion 11 and the alignment portion 10 is greater than 90° and less than or equal to 120°.

[0043] As a result, when the alignment portion 10 is inserted into the bolt fastening hole of the flange and the arm portion 11 is rotated toward the piping portion, the handle of the arm portion does not come into contact with the piping portion, and misalignment of the bolt fastening hole can be corrected by the principle of leverage. In addition, when the arm portion 11 is rotated toward the opposite side from the piping portion, the handle of the arm portion does not come into contact with the flange portion, and misalignment of the bolt fastening hole can be corrected by the principle of leverage. This type of work does not require the use of any additional tools other than the flange alignment jig, such as a hammer, and can be done with one hand, making it more effective when working at high altitudes, for example.

[0044] (2) The angle A between the arm portion 11 and the positioning portion 10 is equal to or greater than 95° and equal to or less than 115°. As a result, even with pipes of various sizes, it is possible to effectively prevent the handle of arm portion 11 from coming into contact with the pipe portion or flange portion.

[0045] (3) The alignment portion 10 has an extension portion 10c extending from the end of the arm portion 11 to the opposite side of the alignment portion 10, The flange alignment jig 1 further includes a rib 13 that connects the extension portion 10c and the arm portion 11.

[0046] As a result, when the flange alignment jig 1 is rotated, the rib 13 acts as a reinforcing material and can prevent the welding joint between the alignment portion 10 and the arm portion 11 from coming loose.

[0047] (4) The flange alignment jig 1 further includes a chisel portion 12 that extends from the end of the arm portion 11 opposite the end along the axis of the arm portion 11 and that decreases in thickness toward the tip.

[0048] As a result, it becomes easy to widen the gap between the flanges and correct misalignment of the bolt fastening holes in the pipes using only the flange alignment jig 1. This reduces the frequency of ascending and descending the stepladder to change tools when working at heights using a stepladder, for example, and allows for more efficient work.

[0049] The flange alignment jig 1 according to the present disclosure is not limited to the configuration of the above embodiment, and various modifications are possible.

[0050] The cross-sectional shape of the arm portion 11 is circular, but it may be other shapes, such as rectangular, triangular, etc. In this case, the size of the cross-sectional shape can be appropriately selected taking into consideration the ease of holding the arm portion and its weight.

[0051] The arm portion 11 has a solid portion 11b and a hollow portion 11a, but may be composed of only a solid portion or only a hollow portion. In order to reduce the weight of the flange alignment jig, it is preferable that the arm portion 11 be composed of only a hollow portion.

[0052] The cross-sectional shape of the alignment portion 10 is circular, but may be other shapes, such as rectangular, triangular, etc. In this case, the size of the cross-sectional shape can be appropriately selected taking into consideration the inner diameter of the bolt fastening hole in the flange portion of the target pipe.

[0053] The shape of the alignment portion 10 is a truncated cone, but it may also be a cone shape, and further, it may have a shape in which the outer diameter gradually decreases toward the Y1 side.

[0054] The flange alignment jig 1 includes the chisel portion 12, but does not necessarily include the chisel portion 12. When the flange alignment jig does not include the chisel portion 12, the length L1 in the X direction of the flange alignment jig is the length of the arm portion in the X direction.

[0055] The arm portion 11, the alignment portion, and the chisel portion 12 are joined by welding, but may be formed integrally.

[0056] In this specification, the flange alignment jig 1 is described assuming that it is used to correct misalignment of bolt fastening holes in a circular flange portion. However, the flange alignment jig of the present disclosure can also effectively correct misalignment of bolt fastening holes in, for example, a rectangular flange portion.

[0057] [Note] The flange alignment jig according to the present disclosure provides the following aspects.

[0058] [Aspect 1] A long arm portion, an elongated alignment portion extending from an end of the arm portion and intersecting an axis of the arm portion; It is equipped with The angle between the arm portion and the alignment portion is greater than 90° and less than or equal to 120°. Flange alignment jig.

[0059] [Aspect 2] The angle between the arm portion and the alignment portion is greater than or equal to 95° and less than or equal to 115°. The flange alignment jig according to aspect 1.

[0060] [Aspect 3] the alignment portion has an extension portion extending from the end portion of the arm portion to a side opposite to the alignment portion, The flange alignment jig further includes a rib connecting the extension portion and the arm portion. 3. The flange alignment jig according to claim 1 or 2.

[0061] [Aspect 4] The flange alignment jig further includes a chisel portion extending from an end of the arm portion opposite to the end portion along an axis of the arm portion and decreasing in thickness toward a tip thereof. The flange alignment jig according to any one of the first to third aspects. [Explanation of symbols]

[0062] 1: Flange alignment jig 10: Alignment section 10a: Bolt fastening hole insertion part 10b: Connection part 10c: Extension part 11: Arm section 11a: Hollow part 11b: Solid part 12: Chisel section 12a: Rectangular part 12b: Change section 13: Rib 100: First piping 200: Second piping 101, 201: Flange part 101a, 201a: Bolt fastening holes 102, 202: Piping section L1: Total length of the arm and chisel in the X direction L2: Y-direction length of the bolt fastening hole insertion section A: Angle between the arm and the alignment part P1: 1st contact point P2: 2nd contact point R1, R3: Clockwise direction R2, R4: Counterclockwise

Claims

1. A long arm portion, an elongated alignment portion extending from an end of the arm portion and intersecting an axis of the arm portion; It is equipped with the angle between the arm portion and the alignment portion is greater than 90° and less than or equal to 120°; Flange alignment jig.

2. The angle between the arm portion and the alignment portion is greater than or equal to 95° and less than or equal to 115°. The flange alignment jig according to claim 1 .

3. the alignment portion has an extension portion extending from the end portion of the arm portion to a side opposite to the alignment portion, The flange alignment jig further includes a rib connecting the extension portion and the arm portion. The flange alignment jig according to claim 1 or 2.

4. The flange alignment jig further includes a chisel portion extending from an end of the arm portion opposite to the end portion along an axis of the arm portion and decreasing in thickness toward a tip thereof. The flange alignment jig according to claim 2.

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