Metal bar bending tool

Abstract

To provide a metal bar bending tool capable of bending a metal bar for fixing an elevator jamb to a building with a relatively simple configuration. [Solution] The device includes a first pipe 20 which is a first cylindrical body into which a first end of a metal rod MB is inserted, and a second pipe 30 which is a second cylindrical body into which a second end of the metal rod MB is inserted. With the metal rod MB inserted into the first pipe 20 and the second pipe 30, the metal rod MB is bent by bringing both ends of the first pipe 20 and the second pipe 30 farther from the center closer together so that the ends draw arcs R1 and R2, with the metal rod MB portion between the first pipe 20 and the second pipe 30 as the center.

Description

[Technical field]

[0001] The present invention relates to a metal bar bending tool, and more particularly to a tool for bending metal bars used to secure jambs to buildings in elevator construction work. [Background technology]

[0002] Fig. 10(a) shows a front view of the landing entrance seen from the landing side during elevator construction work, and Fig. 10(b) shows an enlarged view of part A in Fig. 10(a). Jamb 302 is a frame that surrounds both sides and the top of the elevator landing entrance. Jamb 302 is installed in opening 310 that is opened in the building and communicates with the hoistway. Here, the frames installed on both sides are referred to as vertical frames 304, 306, and the frame installed on the top is referred to as horizontal frame 308.

[0003] FIG. 11(a) shows an enlarged plan view of FIG. 10(a) cut along line M·M. The frame 302 is fixed via metal rods MB by welding metal anchors 316, 318 driven into side walls 312, 314 (RC walls: reinforced concrete walls) of the opening 310 and vertical frames 304, 306. Alternatively, as shown in FIG. 11(b), steel columns 320, 322 are provided parallel to both sides of the opening 310, and metal rods MB are welded to the steel columns 320, 322 and vertical frames 304, 406, thereby fixing the frame 302 to the building via metal rods MB. FIG. 11(b) shows an example in which steel columns 320, 322 are provided in the opening 310 for fixing the frame 302, and is drawn following FIG. 11(a).

[0004] 10(a) is an example in which vertical frames 304, 306 are each fixed to the building at three points (parts A to C, and parts D to F) using metal bars MB. Usually, only the vertical frames 304, 306 are fixed to the building, but as in the illustrated example, there are also cases in which the horizontal frame 308 is fixed to the building using metal bars MB (parts G and H).

[0005] In construction, there is variation in the distance between the metal anchor 316 and the vertical frames 304, 306, or the distance between the steel columns 320, 322 and the vertical frames 304, 306. For this reason, the metal rod MB (Fig. 10(c)) is bent in an arc (Fig. 10(d)) and the degree of bending, i.e., the height h of the crest is changed to accommodate the variation. That is, the top of the crest of the metal rod bent in an arc is welded to the metal anchors 316, 318 or the steel columns 320, 322, and the bottom of the crest (both ends of the metal rod MB) is welded to the vertical frames 304, 306. In this case, when the distance is large, the metal rod MB is bent significantly to increase the height h of the crest, and when the distance is small, the degree of bending is reduced to decrease the height h of the crest, thereby accommodating the variation in the distance.

[0006] The bending of the metal bar MB is carried out on-site while observing the degree of the above-mentioned variation. Specifically, it is carried out as follows. In the first step, one end of the metal bar MB is laid flat on some kind of metal stand, the laid part is stepped on with a foot to fix it, and the metal bar part protruding from the stand is hit with a hammer to bend it slightly into a "L" shape. In the second step, the slightly bent metal bar MB is then stood upright (i.e., so that it looks like a "L" shape when viewed horizontally) and its upper end is hit with a hammer, gradually increasing the degree of bending and processing it into an arch shape according to the above-mentioned distance.

[0007] However, the second step, in which the bending degree is fine-tuned by the impact of the hammer, takes time, and if the core of the metal rod MB is not struck during the impact, the metal rod MB may fly off or the hand holding the metal rod MB may be hit by the hammer. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 61-253135 [Patent Document 2] Japanese Utility Model Application Publication No. 50-060329 [Patent Document 3] Japanese Utility Model Application Publication No. 61-167210 Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, there is a demand for efficient and safe bending of metal bars MB. Although a device for bending rod-shaped members has been devised (Patent Document 1), the device is heavy and inconvenient to carry, and is not suitable for on-site work. In addition, portable tools have also been devised (Patent Document 2, Patent Document 3), but both are used for bending relatively thick and long reinforcing bars used as building materials, and are not suitable for bending the relatively thin and short metal bars MB (e.g., diameter 9 mm, length 150 mm).

[0010] In view of the above problems, the present invention aims to provide a metal bar bending tool that has a relatively simple configuration and is capable of bending metal bars for fixing an elevator jamb to a building. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, the metal bar bending tool of the present invention is a metal bar bending tool for bending a metal bar used to fix a jamb to a building in elevator construction work, and includes a first cylindrical body into which a first end side of the metal bar is inserted, and a second cylindrical body into which a second end side of the metal bar is inserted, and is characterized in that, when the metal bar is inserted into the first cylindrical body and the second cylindrical body, the metal bar is bent by bringing both ends of the first cylindrical body and the second cylindrical body farther from the center thereof closer together relative to each other so that the both ends form an arc with the metal bar portion between the first cylindrical body and the second cylindrical body as the center.

[0012] The connector is also characterized by having a stopper that defines the insertion length of the metal rod from the inserted end of the first cylindrical body.

[0013] The present invention is also characterized in that it has a longitudinal member shaped to form a groove with at least two band plate portions, a first band plate portion and a second band plate portion, the longitudinal member being longer than the first cylindrical body, the first cylindrical body being fixed to one end side of the longitudinal member in a state where it is fitted into the groove, and the second cylindrical body being stored in the groove on the other end side of the longitudinal member when not in use.

[0014] Furthermore, the first band plate portion is provided with a protrusion protruding from its main surface toward the groove, and one end portion of the second cylindrical body is provided with a hole in its thickness direction, and the second cylindrical body is stored with the protrusion inserted into the hole.

[0015] The longitudinal member further includes a third band plate portion which faces the first band plate portion and has a shape in which the three band plate portions form a groove having a U-shaped cross section, and the third band plate portion has a notch portion which allows the second cylindrical body to pass through in the axial direction of the protrusion when the protrusion is inserted or removed from the hole while the second cylindrical body is in a position parallel to a direction perpendicular to the second band plate portion which forms the bottom of the groove.

[0016] Furthermore, the present invention is characterized in that a magnet is fixed to a main surface of the second band plate portion, which attracts the second cylindrical body while it is stored. Effect of the Invention

[0017] With the metal rod bending tool of the present invention having the above-mentioned configuration, it is possible to bend a metal rod for fixing an elevator jamb to a building with a simple configuration in which one end of a metal rod is inserted into a first cylindrical body and the other end into a second cylindrical body, and the two ends of the first cylindrical body and the second cylindrical body that are farthest from the center are brought relatively closer together so as to draw an arc around the metal rod portion between the first cylindrical body and the second cylindrical body. [Brief description of the drawings]

[0018] [Figure 1]1A is a front view of a first pipe, FIG. 1B is a right side view of the first pipe, FIG. 1C is a front view of a second pipe, and FIG. 1D is a right side view of the second pipe, of the metal bar bending tool of the first embodiment. [Diagram 2] (a) is a front view of the longitudinal member of the above-mentioned metal bar bending tool, (b) is a plan view of the same, (c) is a rear view of the same, and (d) is a cross-sectional view taken along line N-N in (a). [Diagram 3] (a) is a front view of the metal bar bending tool, (b) is a plan view of the same, (c) is a right side view of the same, (d) is a left side view of the same, and (e) is a plan view of the same with the second pipe removed from the longitudinal member. [Figure 4] 5A to 5C are schematic diagrams for explaining a method of using the metal bar bending tool. [Diagram 5] 5A to 5C are schematic diagrams for explaining a method of using the metal bar bending tool. [Figure 6] 5A to 5C are schematic diagrams for explaining a method of using the metal bar bending tool. [Figure 7] 4(a) is a front view of the metal bar bending tool, and (b) is a plan view of the same, both of which show the state in which the position of the bolt that determines the insertion length of the first pipe has been changed from the position shown in FIG. [Figure 8] FIG. 1 shows a metal bar bending tool of embodiment 2, in which (a) is a front view, (b) is a plan view, (c) is a right side view, (d) is a left side view, and (e) is a plan view of the same with the second pipe removed from the longitudinal member. [Figure 9] 6 is a schematic diagram for explaining a method of using the metal rod bending tool according to the second embodiment. FIG. [Figure 10] FIG. 1(a) is a front view of the landing entrance seen from the landing side during elevator construction work, FIG. 1(b) is an enlarged view of part A in FIG. 1(a), FIG. 1(c) is a diagram showing the metal bar before bending, and FIG. 1(d) is a diagram showing the metal bar after bending. [Figure 11]10(a) is an enlarged plan view taken along line M·M in FIG. 10(a), and (b) is a diagram showing an example in which a steel column is provided at the opening of the elevator shaft to fix the frame on three sides, and is drawn following (a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the metal bar bending tool according to the present invention will be described based on the embodiment with reference to the drawings. Note that the scales of the components in each drawing are not necessarily uniform. The metal bar MB to be bent is a round bar shown in FIG. 10(c), and has, for example, a diameter of 9 mm and a length of 150 mm. In addition to this, metal bars having lengths of 200 mm, 250 mm, 300 mm, etc. may be used depending on the distance between the three-sided frame 302 and the metal anchors 316, 318, or the distance between the three-sided frame 302 and the steel columns 320, 322. For the metal bar MB, a relatively soft material that is easy to weld is used among carbon steels.

[0020] <Embodiment 1> The metal bar bending tool 10 according to the first embodiment has a first pipe 20 as a first cylindrical body and a second pipe 30 as a second cylindrical body. FIG. 1(a) shows a front view of the first pipe 20, and FIG. 1(b) shows a right side view of the same. FIG. 1(c) shows a front view of the second pipe 30, and FIG. 1(d) shows a right side view of the same. The first pipe 20 and the second pipe 30 are cylindrical, and for example, a steel pipe (carbon steel pipe for machine structure) is used. Note that the first pipe 20 and the second pipe 30 are not limited to carbon steel, and may be formed of other metal materials.

[0021] The inner diameters of the first pipe 20 and the second pipe 30 are set to, for example, 11.7 mm, taking into consideration the diameter of the metal bar MB to be inserted. The first pipe 20 has a hole 20a opening in its thickness direction at a predetermined position in the length direction. The second pipe 30 has a hole 30a opening in its thickness direction at one end portion. The holes 20a and 30a will be described in further detail below.

[0022] The metal bar bending tool 10 has a longitudinal member 40. A front view of the longitudinal member 40 is shown in Fig. 2(a), a plan view of the same is shown in Fig. 2(b), a rear view of the same is shown in Fig. 2(c), and a cross-sectional view taken along line N-N is shown in Fig. 2(d).

[0023] The longitudinal member 40 includes a first band plate portion 42, a second band plate portion 44, and a third band plate portion 46, and has a cross section that forms a U-shaped groove 40a as shown in Fig. 2(d). The longitudinal member 40 can be formed by bending a rectangular steel plate or the like.

[0024] As shown in FIG. 2(a), the first band plate portion 42 has three female threads 42a, 42b, and 42c formed in the thickness direction thereof.

[0025] A notch 46a is provided in the third band plate portion 46. As shown in Fig. 2(b) and Fig. 2(c), the notch 46 is provided in a region facing the female thread 42c formed in the first band plate portion 42 and its vicinity.

[0026] A front view of the metal bar bending tool 10 having the above-mentioned first pipe 20, second pipe 30, and longitudinal member 40 is shown in Fig. 3(a), a plan view thereof is shown in Fig. 3(b), a right side view thereof is shown in Fig. 3(c), and a left side view thereof is shown in Fig. 3(d). Figs. 3(a), 3(b), and 3(c) show a state in which the metal bar bending tool 10 is not in use and the second pipe 30 is stored in the groove 40a of the longitudinal member 40. Fig. 3(e) is a plan view of the state in which the second pipe 30 has been removed from the longitudinal member 40.

[0027] The first pipe 20 is fixed to the longitudinal member 40 by joining the first strip portion 42 and the outer peripheral surface and the third strip portion 36 and the outer peripheral surface by groove welding along the length direction of the groove 40a (weld beads are not shown). The first pipe 20 is fixed to the longitudinal member 40 with the female thread 42a (FIG. 2(a)) and the hole 20a (FIG. 1(a)) communicating with each other.

[0028] A bolt 50 is screwed into the female thread 42a and tightened to fix the first band plate portion 42. The tip portion of the bolt 50 passes through the hole 20a (FIGS. 1(a) and 1(b)) and advances into the first pipe 20 as shown in FIG. 3(d).

[0029] A bolt 60 is screwed into the female thread 42c (FIG. 2(a)) and tightened to fix the first band plate portion. The tip portion of the bolt 60 passes through the hole 30a (FIGS. 1(c) and 1(d)) and advances into the second pipe 30 as shown in FIG. 3(c).

[0030] A magnet (a band-shaped magnet sheet 70 in this example) is fixed (glued in this example) to the bottom of the groove 40a of the longitudinal member 40, i.e., to the upper surface of the second band plate portion 44. The magnet sheet 70 attracts the second pipe 30 in the stored state.

[0031] Next, a procedure for storing the second pipe 30 in the longitudinal member 40 will be described. First, the second pipe 30 is positioned parallel to the direction perpendicular to the main surface of the second band plate portion 44, as indicated by the dashed line. While maintaining this position, the lower end portion is moved in the direction of arrow P1 (i.e., the axial direction of the bolt 60) to pass through the notch portion 46a, and the tip portion of the bolt 60 is inserted into the hole 30a (FIGS. 1(c) and 1(d)).

[0032] In this state, the second pipe 30 is rotated (tilted) around the bolt 60 in the direction of the arrow Q1 and stored in the groove 40a. The second pipe 30 stored in the groove 40a is attracted to the magnetic sheet 70. This maintains the stored state of the second pipe 30, and prevents the second pipe 40 from moving away from the bottom of the groove 40a even if, for example, the opening of the groove 40a is facing downward.

[0033] Next, the procedure for preparing the metal bar bending tool 10 for use and bending the metal bar MB will be described with reference to the schematic diagrams shown in Fig. 4 to Fig. 6. First, the second pipe 30 is removed from the longitudinal member 40. The procedure for removing is the reverse of the procedure for storing described above. That is, as shown in Fig. 4(a), the second pipe 30 is rotated (uprighted) around the bolt 60 in the direction of the arrow Q2 until it is in a position perpendicular to the main surface of the second band plate portion 44.

[0034] Then, while maintaining this posture, the lower end portion is moved in the direction of arrow P2 (i.e., the axial direction of the bolt 60) to pass through the notch 46a, and the tip portion of the bolt 60 is pulled out from the hole 30a (FIGS. 1(c) and 1(d)) (FIGS. 4(b) and 4(c)). This results in the second pipe 30 being removed from the longitudinal member 40.

[0035] Next, one end (first end side) of the metal bar MB is inserted into the first pipe 20. At this time, the metal bar MB is inserted until the tip of the insertion side abuts against the bolt 50 portion protruding into the first pipe 20 (FIG. 5(a)). In the longitudinal direction of the first pipe 20, the position where the bolt 50 (female thread 42a) is provided is as follows. As described later, the part of the metal bar MB inserted into the first pipe 20 that is exposed from the first pipe 20 is bent. The center of bending is approximately the middle of the metal bar MB in the longitudinal direction. Therefore, the bolt 50 is provided at a position where approximately the middle of the inserted metal bar MB is near the end of the first pipe 20. For example, in the case of a metal bar with a length of 150 mm, the position is such that the inserted metal bar MB is exposed from the first pipe 20 by a length of 80 mm, that is, the middle 75 mm is near the end of the first pipe 20. As described above, the bolt 50 functions as a stopper that determines the insertion length L1 of the metal bar MB from the inserted end 20b of the first pipe 20 (FIG. 3(b)).

[0036] For example, when a metal bar longer than the above-mentioned metal bar MB is to be bent, the threaded end of the bolt 50 is changed from the female thread 42a to the female thread 42b (FIG. 3(a)) as shown in FIG. 7. This changes the insertion length of the metal bar MB from the inserted end 20b of the first pipe 20 from L1 (FIG. 3(b)) to a longer L2 (FIG. 7(b)).

[0037] Next, the other end (the second end side) of the metal bar MB is inserted into the second pipe 30 (FIG. 5(b)). Then, the part of the longitudinal member 40 near the first pipe 20 is stepped on the floor (not shown) with one foot to prevent the longitudinal member 20 and, by extension, the first pipe 20 from moving. In this state, the second pipe 30 is grasped, and the second pipe 30 is lifted up so that the both ends of the first pipe 20 and the second pipe 30 farther from the center draw arcs R1 and R2 and move relatively closer to each other, thereby bending the metal bar MB into an arch shape (FIG. 6).

[0038] After bending, the first pipe 20 and the second pipe 30 are removed from the metal bar MB and used to fix the three-sided frame 302.

[0039] According to the metal rod bending tool 10 according to the first embodiment described above, the following effects are achieved. (1) The metal rod MB for fixing the elevator jamb 302 to the building can be bent with a simple configuration in which one end of the metal rod MB is inserted into the first pipe 20 and the other end is inserted into the second pipe 30, and the two ends of the first pipe 20 and the second pipe 30 that are farther from the center are brought relatively closer together so as to draw an arc around the part of the metal rod MB between the first pipe 20 and the second pipe 30.

[0040] (2) The simple structure described above allows for good portability, making the device suitable for construction work in which the work site changes frequently, such as for each elevator landing.

[0041] (3) The bolt 50, which abuts one end of the metal rod MB and restricts further insertion into the first pipe 20, determines the insertion length of the metal rod MB from the inserted end of the first pipe 20. This stabilizes the position of the bent part of the metal rod MB, and makes it possible to minimize variation in the position of the bent parts among multiple metal rods MB.

[0042] (4) The first pipe 20 is fixed in a state where it is fitted into the groove 40a of the longitudinal member 40, which is longer than the first pipe 20 and has a U-shaped cross section. Therefore, during work, the first pipe 20 can be fixed by stepping on the longitudinal member 40 on the floor. This improves workability.

[0043] (5) The second pipe 30 is configured to be stored in the groove 40a of the longitudinal member 40 when not in use, which makes it convenient to carry the entire metal bar bending tool 10. In addition, the second pipe 20 is stored with the threaded portion of the bolt 60 protruding from the first band plate portion 42 of the longitudinal member 40 toward the groove 40a inserted into the hole 20a, which prevents the second pipe 30 from slipping out in the length direction of the longitudinal member 40 during transportation, etc.

[0044] (6) Since the second pipe 30 in the stored state is attracted to the magnetic sheet 70 adhered (fixed) to the main surface of the second strip portion 44, which is the bottom of the groove 40a of the longitudinal member 40, the second pipe 30 can be prevented from popping out of the opening of the groove 40a.

[0045] <Embodiment 2> The metal rod bending tool 200 according to the second embodiment has a basically similar configuration to the metal rod bending tool 10 according to the first embodiment, except that the shapes of the longitudinal members are different. Therefore, in Fig. 8 and Fig. 9, the components of the metal rod bending tool 200 are given reference numerals in the 200s, and the reference numerals of the corresponding components in the metal rod bending tool 10 are given to the two digits of the reference numerals. The explanation of the components will be mentioned only as appropriate, and the following explanation will focus on the differences.

[0046] FIG. 8 shows a metal bending tool 200, where (a) is a front view, (b) is a plan view, (c) is a right side view, (d) is a left side view, and (e) is a plan view of the longitudinal member 240 with the second pipe 230 removed, and is drawn following FIG. 3.

[0047] The longitudinal member 40 in the first embodiment has a shape in which the first band plate portion 42, the second band plate portion 44, and the third band plate portion 46 form a groove 40a with a U-shaped cross section, but the longitudinal member 240 in the second embodiment has a shape in which the first band plate portion 242 and the second band plate portion 244 form a groove 240a with an L-shaped cross section, as shown in Fig. 8. The longitudinal member 240 can be formed by bending a rectangular steel plate or the like.

[0048] As shown in FIG. 9, in the metal bar bending tool 200, the elongated member 240 is pressed against a floor or the like (not shown) with the opening of the groove 240a facing downward to perform bending work.

[0049] The metal rod bending tool 200 having the above-mentioned configuration has the same effects as those described above regarding the metal rod bending tool 10.

[0050] While the metal bar bending tool according to the present invention has been described above based on the embodiment, the present invention is of course not limited to the above-mentioned embodiment, and may be, for example, in the following embodiment. (1) In the above embodiment, the first pipes 20, 220 and the second pipes 30, 330, which are round tubes (cylinders), are used as the first and second cylinders. However, they are not limited to cylinders, and square tubes may also be used.

[0051] (2) In the above embodiment, a magnetic sheet is used as the magnet fixed to the second band plate portions 44, 244. However, the magnet to be fixed is not limited to a sheet body, and a rod body (bar magnet) or other shapes may be used.

[0052] (3) In the above embodiment, the magnetic sheets 70, 270 are used to prevent the second pipes 30, 230 stored in the longitudinal members 40, 240 from protruding from the openings of the grooves 40a, 240a. However, this is not limiting. For example, a hook-and-loop fastener belt may be wrapped around the longitudinal members 40, 240 to block part of the openings, thereby preventing the second pipes 30, 230 from protruding from the openings.

[0053] (5) In the above embodiment, the bolt 50 is used as a stopper that determines the insertion length of the metal bar MB into the first pipe 20, 220. However, it is not limited to a bolt, and a pin may be used. That is, instead of the female thread 42a (FIG. 2), a through hole may be opened, and a pin may be press-fitted into the through hole and advanced into the first pipe 20 to serve as a stopper.

[0054] Alternatively, the first pipe 20, 220 may have a bottom, and the bottom may serve as a stopper. That is, a pipe having a length L1 from the open end to the bottom may be used, and the metal rod MB may be inserted until one end of the metal rod MB abuts against the bottom, thereby defining the insertion length.

[0055] (6) In the above embodiment, the bolts 60, 260 are used as protrusions for storing the second pipes 30, 330 in the longitudinal members 40, 240. However, this is not limiting, and a pin may be used. That is, instead of the female thread 42c (FIG. 2), a through hole may be provided, and a pin having an outer diameter equal to the outer diameter of the bolt 60 may be press-fitted into the through hole, and the pin may be inserted into the hole 30a of the second pipe 30.

[0056] (7) In the above embodiment, the longitudinal members 40, 240 are formed by bending steel plates, but this is not limiting. Light-weight channel steel can be used as the longitudinal member 40, and light-weight angle steel can be used as the longitudinal member 240. Alternatively, heavy-weight steel can be used instead of light-weight steel. Furthermore, other shaped materials, such as aluminum extrusions, can be used instead of shaped steel. [Industrial Applicability]

[0057] The metal bar bending tool according to the present invention can be suitably used, for example, as a tool for bending metal bars used to secure jambs to buildings in elevator construction work. [Explanation of symbols]

[0058] 10, 210 Metal bar bending tool 20, 220 First Pipe 30, 230 Second Pipe

Claims

1. A metal rod bending tool for bending metal rods used to fix a jamb to a building in elevator construction work, a first cylindrical body into which a first end side of the metal rod is inserted; a second cylindrical body into which a second end side of the metal rod is inserted; Including, In a state where the metal rod is inserted into the first cylinder and the second cylinder, the metal rod is bent by relatively bringing both ends of the first cylinder and the second cylinder closer to each other so that the both ends draw an arc around the metal rod portion between the first cylinder and the second cylinder, moreover, a longitudinal member having a shape in which at least two strips, a first strip and a second strip, form a groove, the longitudinal member being longer than the first cylindrical body; A metal bar bending tool characterized in that the first cylindrical body is fixed to one end side of the longitudinal member in a state where it is fitted into the groove, and when not in use, the second cylindrical body is stored in the groove on the other end side of the longitudinal member.

2. The first band plate portion is provided with a protrusion protruding from a main surface thereof toward the groove, A hole is formed in one end portion of the second cylindrical body in the thickness direction thereof, 2. The metal bar bending tool according to claim 1, wherein the second cylindrical body is stored in a state in which the projection is inserted into the hole.

3. The longitudinal member includes a third band portion, the third band portion faces the first band portion, and the three band portions have a cross section that forms a groove having a U-shape, The metal bar bending tool according to claim 2, characterized in that the third strip portion has a notch portion that allows the second cylindrical body to pass through in the axial direction of the protrusion when the protrusion is inserted or removed from the hole while the second cylindrical body is in an orientation parallel to a direction perpendicular to the second strip portion that forms the bottom of the groove.

4. A metal bar bending tool as described in any one of claims 1 to 3, characterized in that a magnet is fixed to a main surface of the second strip portion to attract the second cylindrical body while it is stored.

5. 4. The metal rod bending tool according to claim 1, further comprising a stopper that defines an insertion length of the metal rod from the insertion end of the first cylindrical body.

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