JP7814697B2 - Cylindrical body connecting method and cylindrical body crimping tool - Google Patents

Description

The present invention relates to a method for connecting cylindrical objects and a tool for crimping cylindrical objects.

A conventional method for connecting multiple tubular members is to use a crimping tool. For example, Patent Document 1 describes a pipe crimping tool in which a joint pipe is inserted between two pipes, and with the left and right handles open, the pipe is clamped in the gap between the opposing prongs, and the left and right handles are closed inward to crimp the pipes with the opposing prongs.

Japanese Utility Model Application Publication No. 63-127717

However, the pipe crimping tool described in Patent Document 1 requires manual operation to close the left and right handles inward, so while it can crimp small-diameter, low-strength pipes, it cannot crimp large-diameter or high-strength pipes, or even if it can, the crimping operation is difficult.

The present invention was developed in consideration of the above-mentioned problems, and its purpose is to provide a tubular body connecting method and tubular body crimping tool that can reduce the workload when crimping tubular members with large diameters or high strength.

To achieve the above-mentioned objective, the tubular body connecting method of the present invention is characterized by comprising: an insertion step of inserting a joint member into a first tubular member and a second tubular member, or inserting the first tubular member and the second tubular member into the joint member, spanning the first tubular member and the second tubular member; a first attachment step of attaching a tubular body crimping tool to the outer periphery of the first tubular member or the joint member; a first crimping step of pressing a circumferential portion of the first tubular member or the joint member after or concurrently with the first attachment step to crimp and connect the first tubular member and the joint member; a second attachment step of attaching a tubular body crimping tool to the outer periphery of the second tubular member or the joint member; and a second crimping step of pressing a circumferential portion of the second tubular member or the joint member after or concurrently with the second attachment step to crimp and connect the second tubular member and the joint member.

In the tubular body connecting method according to the present invention, the first crimping step preferably involves supporting a circumferential portion of the first tubular member or the joint member through surface contact, pressing a portion opposite the supported portion to crimp and connect the first tubular member to the joint member, and the second crimping step preferably involves supporting a circumferential portion of the second tubular member or the joint member through surface contact, pressing a portion opposite the supported portion to crimp and connect the second tubular member to the joint member.

In the tubular body connecting method according to the present invention, the first crimping step may further include a step of pressing a portion of the first tubular member or the joint member opposite the supporting portion while another circumferential portion of the first tubular member or the joint member is supported by surface contact, thereby crimping and connecting the first tubular member and the joint member; and the second crimping step may further include a step of pressing a portion of the second tubular member or the joint member opposite the supporting portion while another circumferential portion of the second tubular member or the joint member is supported by surface contact, thereby crimping and connecting the second tubular member and the joint member.

In the tubular body connecting method according to the present invention, it is preferable that the first crimping step involves simultaneously pressing a circumferential portion of the first tubular member or the joint member and another circumferential portion different from the circumferential portion to crimp and connect the first tubular member and the joint member, and the second crimping step involves simultaneously pressing a circumferential portion of the second tubular member or the joint member and another circumferential portion different from the circumferential portion to crimp and connect the second tubular member and the joint member.

The tubular body crimping tool of the present invention is a tubular body crimping tool that crimps and connects a tubular member and a joint member that is inserted into the tubular member or through which the tubular member is inserted, and is characterized in that it comprises a main body portion that can surround the outer periphery of the tubular member or the joint member, and a pressing portion that can press a circumferential portion of the tubular member or the joint member, and the main body portion comprises a first main body portion that surrounds a portion of the tubular member or the joint member, a second main body portion that surrounds another portion of the tubular member or the joint member, and a fastening portion that brings the first main body portion and the second main body portion closer to or apart from each other, and is configured to be attachable to the outer periphery of the tubular member or the joint member by the fastening portion.

In the tubular body crimping tool according to the present invention, the fastening portion preferably includes a fastening bolt provided at the tip of one of the first and second body portions, an insertion portion provided at the tip of the other of the first and second body portions and through which the fastening bolt is inserted, and a nut threaded onto the fastening bolt.

In the tubular body crimping tool according to the present invention, the pressing portion may be provided on at least one of the first main body portion and the second main body portion, and when the fastening bolt is inserted through the insertion portion, the nut may be tightened on the fastening bolt to tighten the first main body portion and the second main body portion in a direction that brings them closer to each other, and the pressing portion may press the tubular member or the joint member, crimping and connecting the tubular member and the joint member.

In the tubular body crimping tool according to the present invention, the pressing portion preferably has a protrusion that presses the tubular member or the joint member, and the protrusion preferably has a curved tip.

The tubular body crimping tool according to the present invention may further include a receiving portion capable of supporting, through surface contact, a portion of the tubular member or the joint member that faces the pressing portion, and may be configured to crimp and connect the tubular member and the joint member by pressing the tubular member or the joint member with the pressing portion while the tubular member or the joint member is supported by the receiving portion.

In the tubular body crimping tool according to the present invention, it is preferable that the receiving portion has a positioning hole portion that penetrates from the support surface that supports the tubular member or the joint member to the surface opposite the support surface.

In the tubular body crimping tool according to the present invention, the receiving portion may be configured to support the tubular member or the joint member in a circumferential direction of an area of 90° or more and less than 180° by surface contact.

In the cylindrical body crimping tool according to the present invention, it is preferable that the pressing portion is provided on each of the first main body portion and the second main body portion.

The cylindrical body connecting method and cylindrical body crimping tool of the present invention make it possible to reduce the workload when crimping cylindrical members with large diameters or high strength.

FIG. 2 is a perspective view showing a cylindrical body crimping tool according to the present embodiment. FIG. 2 is a side view showing the cylindrical body crimping tool according to the present embodiment. 10 is a diagram showing a state in which a joint member is inserted into a cylindrical member according to the embodiment. FIG. 10A and 10B are diagrams showing a state in which the receiving portion according to the embodiment supports a part of the circumferential direction of the cylindrical member by surface contact. 10 is a diagram showing a state in which the tubular member and the joint member according to the embodiment are crimped at one point. FIG. 10A and 10B are diagrams showing a state in which the receiving portion according to the embodiment supports another portion of the cylindrical member in the circumferential direction by surface contact. 10 is a diagram showing a state in which the tubular member and the joint member according to the embodiment are crimped at two points. FIG. 10 is a view showing a state in which the first cylindrical member and the second cylindrical member according to the present invention are connected to each other; FIG. FIG. 10 is a side view showing a modified example of the cylindrical body crimping tool. 10 is a diagram showing a state in which a cylindrical body crimping tool according to a modified example is attached to a cylindrical member. FIG. 10A and 10B are diagrams showing a state in which a cylindrical body crimping tool according to a modified example has crimped a cylindrical member and a joint member at two points.

Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions claimed in the claims, and not all combinations of features described in the embodiments are necessarily essential to the solutions of the inventions. Furthermore, in the present embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[Overall structure of the cylindrical body crimping tool]
The cylindrical body crimping tool 1 according to this embodiment is a cylindrical body crimping tool that crimps and connects a cylindrical member 2 and a joint member 3 that is inserted into the cylindrical member 2 or through which the cylindrical member 2 is inserted. Specifically, as shown in Figures 1 and 2, the cylindrical body crimping tool 1 includes a main body 10 that can surround the outer periphery of the cylindrical member 2 or the joint member 3, a pressing part 20 that can press a portion of the cylindrical member 2 or the joint member 3 in the circumferential direction, and a receiving part 30 that can support, by surface contact, a portion of the cylindrical member 2 or the joint member 3 that faces the pressing part 20.

In the following, the configuration of the tubular body crimping tool 1 and the tubular body connecting method will be described assuming that the joint member 3 is inserted into the tubular member 2 in this embodiment. However, as described above, the tubular body crimping tool 1 according to this embodiment can also be used when the tubular member 2 is inserted into the joint member 3. There is no difference in the configuration of the tubular body crimping tool 1 and the tubular body connecting method between when the joint member 3 is inserted into the tubular member 2 and when the tubular member 2 is inserted into the joint member 3.

Furthermore, in this embodiment, the main body portion 10, pressing portion 20, and receiving portion 30 are described as being composed of separate members, but this is not limited to this, and the main body portion 10, pressing portion 20, and receiving portion 30 may also be formed by integral molding.

In this embodiment, the tubular member 2 is, for example, SGP (carbon steel pipe for piping) or STK (carbon steel pipe for general structural use), but is not limited to these. Furthermore, in this embodiment, the joint member 3 can be made from various known metallic materials.

[Main body configuration]
1 and 2 , the main body 10 includes a first main body 11 that surrounds a portion of the circumferential direction of the tubular member 2 and a second main body 12 that surrounds another portion of the circumferential direction of the tubular member 2. The first main body 11 is formed in a substantially semicircular shape that forms the semicircle of the annular main body 10, and the second main body 12 is formed in a substantially semicircular shape that forms the remaining semicircle of the annular main body 10. The first main body 11 and the second main body 12 are rotatably connected to each other by a shaft 13a at the base end (one end in the circumferential direction) of the main body 10. The first main body 11 and the second main body 12 each have an arc-shaped recess 11a, 12a on their inner circumferential surfaces.

The main body 10 also has a fastening portion 14 that moves the first main body 11 and the second main body 12 closer to or farther apart, and is configured to be attachable to the outer periphery of the tubular member 2 via the fastening portion 14. The fastening portion 14 includes a fastening bolt 14a provided at the tip side (the other end in the circumferential direction) of the second main body 12, an insertion portion 14b provided at the tip side of the first main body 11 and through which the fastening bolt 14a is inserted, and a nut 14c that threads onto the fastening bolt 14a. Note that the first main body 11 may be provided with the fastening bolt 14a, and the second main body 12 may be provided with the insertion portion 14b.

The fastening bolt 14a protrudes from the second body portion 12 toward the first body portion 11 and is rotatably attached to the second body portion 12 by the shaft portion 13b. The insertion portion 14b is a notch formed by cutting out the center of the tip of the first body portion 11 in the circumferential direction, and the insertion portion 14b forms a roughly U-shape at the tip of the first body portion 11. In this embodiment, with the fastening bolt 14a inserted through the insertion portion 14b, tightening the nut 14c brings the first body portion 11 and the second body portion 12 closer to each other, and loosening the first body portion 11 and the second body portion 12 moves them apart. Various known connecting members can be used as the shaft portions 13a and 13b.

As shown in FIG. 2, the first main body 11 has a through hole 11b formed at a position corresponding to a screw receiving portion 21a provided on a base 21 of the pressing portion 20 (described later) when the pressing portion 20 is attached. The second main body 12 has a through hole 12b formed at a position corresponding to a positioning hole 31 of the receiving portion 30 (described later) when the receiving portion 30 is attached.

The material that constitutes the main body 10 may be any material that is strong enough to withstand the stress that occurs when the pressing portion 20 (described below) presses the tubular member 2.

[Configuration of the pressing part]
The pressing portion 20 is provided on at least one of the first body portion 11 and the second body portion 12, and in this embodiment, is provided on the first body portion 11. Specifically, the pressing portion 20 includes an arc-shaped base portion 21 that is attached to fit into the recess 11a of the first body portion 11, and a protrusion portion 22 that protrudes from the base portion 21 toward the second body portion 12 and presses the tubular member 2.

The base 21 is sized to fit into the recess 11a of the first main body 11 in the circumferential and axial directions, and is longer in the radial direction than the recess 11a. The base 21 is provided with a recessed screw receiving portion 21a extending from near the center of its outer circumferential surface to near the center of the base 21. The protrusion 22 is formed with a generally triangular cross section that protrudes from near the center of the inner circumferential surface of the base 21 toward the second main body 12, and its tip 22a is formed with a curved surface. It is sufficient that the protrusion 22 has at least a length in the protruding direction that is sufficient to crimp the tubular member 2 and the joint member 3 when compressing the tubular member 2.

The pressing unit 20 is configured to be detachable from the main body 10. Specifically, when the base 21 is attached to the recess 11a of the first main body 11, the pressing unit 20 is fixed to the main body 10 by threading the screw receiving portion 21a of the base 21 into a screw member 4 such as a screw or bolt that passes through the through hole 11b of the first main body 11, and is configured to be removed from the main body 10 by removing the screw member 4 from the screw receiving portion 21a. Note that, as shown in FIG. 2, the axial length of the screw member 4 is longer than the axial length of the screw receiving portion 21a provided on the base 21.

Furthermore, the pressing portion 20 is configured to be movable toward and away from the first main body portion 11 along the protruding direction of the protrusion 22. Specifically, the pressing portion 20 is configured to advance from the first main body portion 11 toward the second main body portion 12 and press the tubular member 2 by threading the screw member 4 toward the second main body portion 12. On the other hand, the pressing portion 20 is configured to retreat toward the first main body portion 11 and move away from the tubular member 2 by retracting the screw member 4 toward the first main body portion 11.

The pressing portion 20 is preferably made of a material with a higher hardness than the cylindrical member 2 and the joint member 3, and in this embodiment, it is made of a material equivalent to S45C.

[Configuration of receiving part]
The receiving portion 30 is provided on the second main body portion 12 of the main body portion 10, and is formed in an arc shape having a length in the radial direction longer than the recessed portion 12a. The receiving portion 30 is configured to be able to support, by surface contact, a portion of the circumferential direction of the cylindrical member 2. Specifically, the receiving portion 30 is preferably configured to be able to support, by surface contact, an area of the circumferential direction of the cylindrical member 2 that is equal to or greater than 90° and less than 180°.

That is, as shown in FIG. 2, the receiving portion 30 is configured so that the angle θ formed by the imaginary line VL1 extending along one circumferential end face and the imaginary line VL2 extending along the other circumferential end face is preferably greater than or equal to 90° and less than 180°. By configuring the receiving portion 30 in this manner, it becomes possible to prevent the tubular member 2 from being deformed by the external force applied from the second main body portion 12 when the tubular member 2 is pressed.

The receiving portion 30 is also configured to be detachable from the main body portion 10. Specifically, the receiving portion 30 is formed with a size that allows it to fit into the recess 12a of the second main body portion 12 in the axial direction. It is attached to the main body portion 10 by fitting into the recess 12a of the second main body portion 12, and is configured to be detached from the main body portion 10 by removing the receiving portion 30 that is fitted into the recess 12a of the second main body portion 12.

1 and 2, the receiving portion 30 has a positioning hole 31 near its center that penetrates from the support surface that supports the tubular member 2 to the surface opposite the support surface. Specifically, the positioning hole 31 is formed in a position that is 180° opposite the position where the protrusion 22 of the pressing portion 20 presses the tubular member 2 when the receiving portion 30 supports a portion of the circumferential direction of the tubular member 2 by surface contact. Note that the positioning hole 31 is not limited to this; for example, it may be formed in a position that is 120° offset from the position where the protrusion 22 of the pressing portion 20 presses the tubular member 2. In this way, by having the positioning hole 31 in the receiving portion 30, the position where the protrusion 22 presses the tubular member 2 (the crimping marks left by the protrusion 22) can be seen through the through hole 12b of the second main body portion 12 and the positioning hole 31, which has the advantage of making it easier to determine the pressing position when pressing a position different from the previously pressed position.

The material making up the receiving portion 30 does not need to be as strong as the pressing portion 20; for example, a material equivalent to SS400 can be used.

[Method for connecting cylindrical bodies using a cylindrical body crimping tool]
The cylindrical body crimping tool 1 according to this embodiment is configured so that, with the fastening bolt 14a inserted through the insertion portion 14b, the nut 14c can be tightened around the fastening bolt 14a to tighten the first body portion 11 and the second body portion 12 in a direction that brings them closer to each other, and the pressing portion 20 can press the cylindrical member 2 to crimp and connect the cylindrical member 2 and the joint member 3. Furthermore, the cylindrical body crimping tool 1 according to this embodiment crimps and connects the cylindrical member 2 and the joint member 3 by pressing the cylindrical member 2 with the pressing portion 20 while the cylindrical member 2 is supported by the receiving portion 30.

The following describes in detail, using Figures 3 to 8, how to connect the first tubular member 2A and the second tubular member 2B using the tubular body crimping tool 1 described above.

[Insertion process]
First, as shown in FIG. 3, the joint member 3 is inserted into the first cylindrical member 2A and the second cylindrical member 2B, spanning the first cylindrical member 2A and the second cylindrical member 2B.

[First mounting step and first crimping step]
Next, as shown in Fig. 3, the cylindrical body crimping tool 1 is attached to the outer periphery of the first cylindrical member 2A at a position where the first cylindrical member 2A and the joint member 3 overlap. Specifically, the receiving portion 30 is brought into surface contact with a portion of the circumference of the first cylindrical member 2A, and then, as shown in Fig. 4, the fastening bolt 14a of the second main body portion 12 is inserted into the insertion portion 14b provided at the tip of the first main body portion 11, thereby attaching the cylindrical body crimping tool 1 to the outer periphery of the first cylindrical member 2A. In this state, the receiving portion 30 supports a portion of the circumference of the first cylindrical member 2A.

After or in parallel with the first mounting step, a circumferential portion of the first tubular member 2A is pressed, crimping and connecting the first tubular member 2A and the joint member 3. Specifically, as shown in FIG. 5, with the receiving portion 30 supporting a circumferential portion of the first tubular member 2A through surface contact, tightening the nut 14c onto the fastening bolt 14a causes the protrusion 22 of the pressing portion 20 to press the portion opposite the supported portion, crimping and connecting the first tubular member 2A and the joint member 3. Note that if tightening the nut 14c alone is insufficient to achieve sufficient crimping, the screw member 4 can be threaded toward the second main body portion 12, causing the pressing portion 20 to advance further toward the second main body portion 12 and further pressing the tubular member 2.

Next, as shown in FIG. 6, the cylindrical body crimping tool 1 is attached to the outer periphery of the first cylindrical member 2A using a procedure similar to the above-described attachment procedure so that the receiving portion 30 supports another circumferential portion of the first cylindrical member 2A through surface contact. As shown in FIG. 6, with another circumferential portion of the first cylindrical member 2A supported by the receiving portion 30, aligning the positioning hole 31 of the receiving portion 30 and the through-hole 12b of the second main body portion 12 with the pressed position (the crimped mark) makes it easier to determine the pressing position. For example, it is possible to precisely shift the circumferential positions of the first crimping position and the second crimping position by 180 degrees.

As shown in Figure 7, when the receiving portion 30 supports another circumferential portion of the first tubular member 2A through surface contact, tightening the nut 14c causes the protrusion 22 of the pressing portion 20 to press against the portion opposite the support portion, crimping and connecting the first tubular member 2A and the joint member 3. Note that if tightening the nut 14c alone is insufficient, the screw member 4 can be threaded toward the second main body portion 12, as with the first pressing portion, to further advance the pressing portion 20 and press the tubular member 2 further.

[Second mounting step and second crimping step]
Next, the same procedure as in the first crimping step is performed to crimp and connect the second cylindrical member 2B and the joint member 3. That is, using the same procedure as in the first mounting step, the cylindrical body crimping tool 1 is attached to the outer periphery of the second cylindrical member 2B, and in a state in which the receiving portion 30 supports a portion of the second cylindrical member 2B in the circumferential direction by surface contact, the nut 14c and/or the screw member 4 is threaded toward the second main body portion 12, whereby the protrusion 22 of the pressing portion 20 presses the portion opposite the supported portion, thereby crimping and connecting the second cylindrical member 2B and the joint member 3.

Furthermore, with the receiving portion 30 supporting another circumferential portion of the second tubular member 2B through surface contact using a procedure similar to that of the first installation step, the nut 14c and/or the screw member 4 can be threaded toward the second main body portion 12, causing the protrusion 22 of the pressing portion 20 to press against the portion opposite the supporting portion, thereby crimping and connecting the second tubular member 2B and the joint member 3.

In this way, by performing the insertion process, first attachment process, first crimping process, second attachment process, and second crimping process, the first tubular member 2A and the joint member 3 are connected, and the second tubular member 2B and the joint member 3 are connected. As a result, as shown in FIG. 8, the first tubular member 2A and the second tubular member 2B can be connected via the joint member 3. Furthermore, the tubular body crimping tool 1 of this embodiment can be adapted to multiple types of tubular members 2 by changing the size of the tubular body crimping tool 1 according to the diameter of the tubular member 2, or by changing the size of the pressing portion 20 and/or receiving portion 30 according to the diameter of the tubular member 2.

In this embodiment, the first cylindrical member 2A and the joint member 3 are connected by crimping at two points, and the second cylindrical member 2B and the joint member 3 are connected by crimping at two points. However, this is not limited to this, and the first cylindrical member 2A and the second cylindrical member 2B may be crimped to the joint member 3 at one point or at three or more points. When crimping at three or more points, it is preferable that the crimping positions are spaced evenly (phase-shifted) around the circumference. For example, when there are three crimping positions, it is preferable that the crimping positions are spaced 120 degrees apart, and when there are four crimping positions, it is preferable that the crimping positions are spaced 90 degrees apart.

[Advantages of the cylindrical body crimping tool according to this embodiment]
In this way, the tubular body crimping tool 1 of this embodiment is a tubular body crimping tool 1 that crimps and connects a tubular member 2 and a joint member 3 that is inserted into the tubular member 2 or through which the tubular member is inserted, and is equipped with a main body portion 10 that can surround the outer periphery of the tubular member 2 or joint member 3, and a pressing portion 20 that can press a portion of the circumferential direction of the tubular member 2 or joint member 3, and the main body portion 10 is equipped with a first main body portion 11 that surrounds a portion of the tubular member 2 or joint member 3, a second main body portion 12 that surrounds other portions of the tubular member 2 or joint member 3, and a fastening portion 14 that brings the first main body portion 11 and the second main body portion 12 closer to or apart from each other, and is configured to be attachable to the outer periphery of the tubular member 2 or joint member 3 by the fastening portion 14.

With a cylindrical body crimping tool 1 having this configuration, the fastening portion 14 brings the first main body portion 11 and the second main body portion 12 closer together, causing the pressing portion 20 to press a portion of the circumference of the cylindrical member 2 or the joint member 3, thereby crimping the cylindrical member 2 and the joint member 3. This has the significant advantage of eliminating the need for human labor when crimping a cylindrical member and reducing the workload when crimping a cylindrical member with a large diameter or high strength.

The cylindrical body crimping tool 1 having the above configuration is also effective when assembling handrails at construction sites, for example. Generally, handrails are assembled by connecting the ends of multiple cylindrical members by welding them all around. However, the cylindrical body crimping tool 1 having the above configuration eliminates the need for welding and allows the cylindrical member 2 and joint member 3 to be crimped simply by pressing the cylindrical member 2, making the connection process easier and improving work efficiency.

In addition, in the tubular body crimping tool 1 according to this embodiment, the fastening portion 14 includes a fastening bolt 14a provided at the tip of one of the first and second main body portions 11 and 12, an insertion portion 14b provided at the tip of the other of the first and second main body portions 11 and 12, through which the fastening bolt 14a is inserted, and a nut 14c threaded onto the fastening bolt 14a. With a tubular body crimping tool 1 having this configuration, the tubular member 2 and the joint member 3 can be crimped simply by tightening the nut 14c onto the fastening bolt 14a with an electric screwdriver or the like, which has the advantage of significantly reducing the workload when crimping tubular members with large diameters or high strength.

Furthermore, in the tubular body crimping tool 1 according to this embodiment, the pressing portion 20 has a protrusion 22 that presses against the tubular member 2, and the protrusion 22 has a curved tip 22a. A tubular body crimping tool 1 with this configuration can distribute the stress applied to the tip 22a when pressing against the tubular member 2, improving the durability of the protrusion 22, thereby offering the advantage of allowing the tubular body crimping tool 1 to be used for a long period of time.

The tubular body crimping tool 1 according to this embodiment further includes a receiving portion 30 capable of supporting the portion of the tubular member 2 or joint member 3 facing the pressing portion 20 through surface contact. The tubular member 2 or joint member 3 can be crimped and connected by pressing the pressing portion 20 against the tubular member 2 or joint member 3 while supported by the receiving portion 30. With this configuration, the receiving portion 30 supports a portion of the circumferential direction of the tubular member 2 or joint member 3 through surface contact. Therefore, when the pressing portion 20 presses the tubular member 2 or joint member 3, the external force applied to the tubular member 2 from the second main body portion 12 can be dispersed. This advantageously allows the tubular member 2 and joint member 3 to be crimped together without significantly deforming the shape of the tubular member 2.

Furthermore, in the cylindrical body crimping tool 1 according to this embodiment, the receiving portion 30 has a positioning hole portion 31 that penetrates from the support surface that supports the cylindrical member 2 or joint member 3 to the surface opposite the support surface. A cylindrical body crimping tool 1 having this configuration has the advantage that the position where the cylindrical member 2 or joint member 3 is pressed by the protrusion portion 22 (the crimping marks from the previous crimping) can be visually confirmed, making it easier to position the tool when pressing a position different from the previously pressed position.

Furthermore, in the tubular body crimping tool 1 according to this embodiment, the receiving portion 30 is configured to be able to support an area of 90° or more and less than 180° in the circumferential direction of the tubular member 2 or joint member 3 through surface contact. With a tubular body crimping tool 1 having this configuration, the receiving portion 30 is in surface contact with the tubular member 2 or joint member 3 over a wide area, which has the advantage that when the pressing portion 20 presses the tubular member 2 or joint member 3, the external force applied to the tubular member 2 from the second main body portion 12 can be sufficiently dispersed, preventing deformation of the tubular member 2.

[Variations]
The tubular body crimping tool according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical concept of the present invention.

For example, in the above-described embodiment, the pressing portion 20 is provided on the first main body portion 11, and the receiving portion 30 is provided on the second main body portion 12. However, this is not limited to this. For example, as shown in FIG. 9, a pressing portion 20' may be provided on each of the first main body portion 11' and the second main body portion 12'. The configuration of such a cylindrical body crimping tool 1' and a cylindrical body connecting method will be described below using FIGS. 9 to 11. Note that components similar to those in the above-described embodiment will be indicated by the same reference numerals or will not be described again.

As shown in Figure 9, the cylindrical body crimping tool 1' differs in configuration from the above-described embodiment in that the first main body portion 11' includes a semicircular first holding portion 15 and a plate-shaped first extension portion 16 extending from the tip of the first holding portion 15, and the second main body portion 12' includes a semicircular second holding portion 17 and a plate-shaped second extension portion 18 extending from the tip of the second holding portion 17. The cylindrical body crimping tool 1' also differs in configuration from the above-described embodiment in that the pressing portion 20' is composed of a screw member.

The first retaining portion 15 and the second retaining portion 17 are formed to have the same shape and size, and have through holes 11b' and 12b', respectively, at their circumferential centers, through which the pressing portion 20' can pass. The first retaining portion 15 and the second retaining portion 17 are configured to hold the pressing portion 20' with the pressing portion 20' passing through the through holes 11b' and 12b'.

The first extension portion 16 and the second extension portion 18 are formed with the same shape and size. The second extension portion 18 is formed with a mounting hole 18a for attaching the fastening bolt 14, and the fastening bolt 14 is attached to the second main body portion 12' by passing through the mounting hole 18a. The first extension portion 16 is formed with an insertion hole (insertion portion 14b') for inserting the fastening bolt 14. The insertion portion 14b' and the mounting hole 18a are formed with the same shape and size, and are formed as elongated holes extending in the extension direction of the first extension portion 16 and the second extension portion 18.

The pressing portion 20' has a generally T-shaped base 21' and a protrusion 22' that protrudes axially from the base 21', with the tip 22a' of the protrusion 22' having a curved surface. The pressing portion 20' is configured to thread through the through-hole 11b' of the first holding portion 15, thereby allowing the base 21' to thread into the inner surface of the first holding portion 15 and be attached to the first main body portion 11'. Similarly, the pressing portion 20' is configured to thread through the through-hole 12b' of the second holding portion 17, thereby allowing the base 21' to thread into the inner surface of the second holding portion 17 and be attached to the second main body portion 12'.

As shown in FIG. 10 , after inserting the joint member 3 into the tubular member 2 (insertion process), the tubular body crimping tool 1' is attached to the outer periphery of the tubular member 2 by inserting the fastening bolt 14 into the insertion portion 14b' and tightening the nut 14c while the first holding portion 15 and the second holding portion 17 surround the overlapping position of the tubular member 2 and the joint member 3 (first installation process or second installation process). Then, as shown in FIG. 11 , after or in parallel with the installation process, the nut 14c is tightened until the first extension portion 16 and the second extension portion 18 come into contact, causing the pressing portions 20' provided on the first holding portion 15 and the second holding portion 17 to simultaneously press a portion of the tubular member 2 in the circumferential direction and another portion in the circumferential direction, thereby crimping and connecting the tubular member 2 and the joint member 3 (first crimping process or second crimping process). Furthermore, if tightening the nut 14c alone is insufficient, the pressing portions 20', which are respectively threaded onto the first retaining portion 15 and the second retaining portion 17, may be threaded radially inward to further press the cylindrical member 2.

As in the above-described embodiment, the tubular member 2 may be inserted into the joint member 3 before being crimped.

With a cylindrical body crimping tool 1' configured as described above, the pressing portion 20' is provided on each of the first main body portion 11' and the second main body portion 12', allowing the cylindrical member 2 and the joint member 3 to be crimped at two points simultaneously, which has the advantage of not only reducing the workload during crimping but also improving work efficiency. Furthermore, tightening the nut 14c until the first extension portion 16 and the second extension portion 18 come into contact during crimping serves as a guide to the degree of crimping, which has the advantage of allowing appropriate crimping regardless of the worker's level of skill.

In addition to the above-described variations, the cylindrical body crimping tool according to the present invention can be modified in various ways without departing from the technical spirit of the present invention. For example, in the above-described embodiment, the protrusion 22 is described as having a curved tip 22a, but this is not limited to this, and the tip 22a of the protrusion 22 may have a shape other than a curved shape, such as a flat shape or a pointed shape.

In addition, in the above-described embodiment, the receiving portion 30 is described as having a positioning hole portion 31 that penetrates from the support surface that supports the tubular member 2 to the surface opposite the support surface, but this is not limited to this, and the receiving portion 30 may also be configured not to have a positioning hole portion 31.

Furthermore, in the above-described embodiment, the receiving portion 30 was described as being configured to be able to support an area of the tubular member 2 in the circumferential direction that is greater than or equal to 90° and less than 180° by surface contact, but this is not limited to this, and the receiving portion 30 may be configured to support any area of the tubular member 2 in the circumferential direction by surface contact.

Furthermore, in the above-described embodiment, the pressing unit 20 is described as being configured to be detachable from the main body unit 10, but this is not limited thereto, and the pressing unit 20 may also be configured to be non-detachable from the main body unit 10.

Furthermore, in the above-described embodiment, the pressing portion 20 has been described as having a hardness greater than that of the tubular member 2 and the joint member 3, but this is not limited to this. The pressing portion 20 may have the same hardness as the tubular member 2 and the joint member 3, or a hardness less than that of the tubular member 2 and the joint member 3, as long as the function of crimping the tubular member 2 and the joint member 3 is not impaired.

Furthermore, in the above-described embodiment, the receiving portion 30 is described as being configured to be detachable from the main body portion 10, but this is not limited thereto, and the receiving portion 30 may also be configured to be non-detachable from the main body portion 10.

Furthermore, in the above-described embodiment, the pressing portion 20 is described as being configured to be movable toward and away from the first main body portion 11 in the direction along which the protrusion portion 22 protrudes, but this is not limited thereto, and the pressing portion 20 may also be configured to be immovable.

It is clear from the claims that such modifications are included within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1: Cylindrical body crimping tool 2: Cylindrical member 2A: First cylindrical member 2B: Second cylindrical member 3: Joint member 4: Screw member 10: Main body portion 11: First main body portion 11a: Recessed portion 11b: Through hole 12: Second main body portion 12a: Recessed portion 12b: Through hole 13a: Shaft portion 13b: Shaft portion 14: Fastening portion 14a: Fastening bolt 14b: Insertion portion 14c: Nut 15: First holding portion 16: First extension portion 17: Second holding portion 18: Second extension portion 18a: Mounting hole 20: Pressing portion 21: Base portion 21a: Screw receiving portion 22: Protrusion portion 22a: Tip 30: Receiving portion 31: Positioning hole portion VL1: Virtual line VL2: Virtual line

Claims (10)

an insertion step of inserting a joint member into the first tubular member and the second tubular member across the first tubular member and the second tubular member, or inserting the first tubular member and the second tubular member into the joint member;
a first mounting step of mounting a cylindrical body crimping tool on an outer periphery of the first cylindrical member or the joint member;
a first crimping step of pressing a circumferential portion of the first cylindrical member or the joint member after or in parallel with the first attaching step to crimp and connect the first cylindrical member and the joint member;
a second mounting step of mounting a cylindrical body crimping tool on an outer periphery of the second cylindrical member or the joint member;
a second crimping step of pressing a circumferential portion of the second cylindrical member or the joint member after or in parallel with the second mounting step to crimp and connect the second cylindrical member and the joint member ,
the cylindrical body crimping tool has a main body portion capable of surrounding an outer periphery of the cylindrical member or the joint member, a pressing portion capable of pressing a circumferential portion of the cylindrical member or the joint member, and a receiving portion capable of supporting, by surface contact, a portion of the cylindrical member or the joint member that faces the pressing portion;
The main body portion is
a first main body portion surrounding a portion of the tubular member or the joint member;
a second main body portion surrounding the cylindrical member or another portion of the joint member;
a fastening portion that brings the first body portion and the second body portion closer to or apart from each other;
and
The cylindrical body crimping tool is configured to be attachable to the outer periphery of the cylindrical member or the joint member by the fastening portion,
The cylindrical body crimping tool is configured to be able to crimp and connect the cylindrical member and the joint member by pressing the cylindrical member or the joint member with the pressing portion while the cylindrical member or the joint member is supported by the receiving portion.
A cylindrical body connecting method characterized by the above. the first crimping step includes supporting a circumferential portion of the first cylindrical member or the joint member by surface contact, and pressing a portion opposite the supported portion to crimp and connect the first cylindrical member and the joint member;
The tubular body connecting method according to claim 1, characterized in that the second crimping process supports a circumferential portion of the second tubular member or the joint member by surface contact, and presses a portion opposite the supported portion to crimp and connect the second tubular member and the joint member. the first crimping step further includes a step of pressing a portion of the first cylindrical member or the joint member opposite to the supported portion in a state in which the other portion in the circumferential direction of the first cylindrical member or the joint member is supported by surface contact, thereby crimping and connecting the first cylindrical member and the joint member,
The tubular body connecting method according to claim 2, characterized in that the second crimping step further includes a step of pressing a portion opposite to the supported portion while supporting another circumferential portion of the second tubular member or the joint member by surface contact, thereby crimping and connecting the second tubular member and the joint member. A cylindrical body crimping tool that crimps and connects a cylindrical member and a joint member that is inserted into the cylindrical member or through which the cylindrical member is inserted,
a main body portion capable of surrounding an outer periphery of the cylindrical member or the joint member;
a pressing portion capable of pressing a circumferential portion of the cylindrical member or the joint member ;
a receiving portion that can support the cylindrical member or the joint member by surface contact at a portion that faces the pressing portion;
Equipped with
The main body portion is
a first main body portion surrounding a portion of the tubular member or the joint member;
a second main body portion surrounding the cylindrical member or another portion of the joint member;
a fastening portion that brings the first body portion and the second body portion closer to or apart from each other,
The fastening portion is configured to be attachable to the outer periphery of the cylindrical member or the joint member,
The cylindrical member and the joint member can be crimped and connected by pressing the cylindrical member or the joint member with the pressing portion while the cylindrical member or the joint member is supported by the receiving portion.
A cylindrical body crimping tool characterized by the above. The fastening portion is
a fastening bolt provided on a tip end side of one of the first body portion and the second body portion;
an insertion portion provided on the other tip end side of the first body portion and the second body portion, through which the fastening bolt is inserted;
The tubular body crimping tool according to claim 4 , further comprising: a nut that is threaded onto the fastening bolt. the pressing portion is provided on at least one of the first main body portion and the second main body portion,
The cylindrical body crimping tool according to claim 5, characterized in that when the fastening bolt is inserted through the insertion portion, by tightening the nut on the fastening bolt, the first main body portion and the second main body portion are tightened in a direction approaching each other, and the pressing portion presses the tubular member or the joint member, thereby crimping and connecting the tubular member and the joint member. the pressing portion has a protrusion that presses the cylindrical member or the joint member,
The tool for crimping a cylindrical body according to any one of claims 4 to 6 , characterized in that the tip of the protrusion is formed to have a curved surface. The cylindrical body crimping tool according to any one of claims 4 to 6, characterized in that the receiving portion has a positioning hole portion that penetrates from a support surface that supports the cylindrical member or the joint member to an opposite surface of the support surface. The cylindrical body crimping tool according to any one of claims 4 to 6, characterized in that the receiving portion is configured to be able to support an area of the cylindrical member or the joint member in a circumferential direction of 90° or more and less than 180° by surface contact. The tool for crimping a cylindrical body according to claim 8 , wherein the receiving portion is configured to be able to support the cylindrical member or the joint member by surface contact in an area of 90° or more and less than 180° in the circumferential direction.