Jig

Abstract

To provide a tool capable of cutting a tubular member along the extending direction of the tubular member by fixing the tubular member even when the tubular member is a bent pipe.SOLUTION: The jig 1 is a jig for cutting a tubular member 10 along a direction in which the tubular member 10 extends. The jig 1 includes a first frame 2, a second frame 3, a first rotating member 4, a second rotating member 5, a first fixing means 6, a second fixing means 7, and a connecting member 8. The first fixing means 6 has a first inside support part 21 capable of abutting on an inner peripheral surface 13 of the tubular member 10 and a first outside support part 22 capable of abutting on an outer peripheral surface 14 of the tubular member 10, in one end 11 of the tubular member 10. The second fixing means 7 has a second inside support part 31 capable of abutting on an inner peripheral surface 13 of the tubular member 10 and a second outside support part 32 capable of abutting on an outer peripheral surface 14 of the tubular member 10, in the other end 12 of the tubular member 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a jig, and more particularly to a jig for cutting a tubular member along the direction in which the tubular member extends. [Background technology]

[0002] Conventionally, in decommissioning work of a nuclear facility (for example, a nuclear power plant), the inside of the piping used in the reactor is inspected for contamination by radioactive materials before being discarded.

[0003] Specifically, the pipe is first cut to an arbitrary length, then fixed, and cut lengthwise (specifically, along the longitudinal direction of the pipe) to inspect the inside. Meanwhile, a jig, for example, is used to fix the pipe.

[0004] One such jig has been proposed (see, for example, Patent Document 1). The jig includes a first fixing means for fixing one end of a tubular member (pipe) and a second fixing means for fixing the other end of the tubular member (pipe). The first fixing means includes a first inner support portion that can contact the inner circumferential surface of the tubular member (pipe) at one end of the tubular member (pipe) and a first outer support portion that can contact the outer circumferential surface of the tubular member (pipe) at one end of the tubular member (pipe). The second fixing means includes a second inner support portion that can contact the inner circumferential surface of the tubular member (pipe) at the other end of the tubular member (pipe) and a second outer support portion that can contact the outer circumferential surface of the tubular member (pipe) at the other end of the tubular member (pipe). According to the jig of Patent Document 1, the tubular member (pipe) is fixed by supporting one end of the tubular member (pipe) with the first fixing means and supporting the other end of the tubular member (pipe) with the second fixing means. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7422445 Summary of the Invention [Problem to be solved by the invention]

[0006] In the jig of Patent Document 1, the first fixing means and the second fixing means face each other. Therefore, when the pipe is straight, both ends of the pipe face each other along the direction in which the pipe extends, and therefore both ends of the pipe can be supported by the first fixing means and the second fixing means facing each other.

[0007] On the other hand, pipes may be bent (for example, into elbow pipes) depending on the purpose and use.

[0008] When the pipe is bent, the ends of the pipe do not face each other along the direction in which the pipe extends, which causes a problem in that the ends of the pipe cannot be supported by the first fixing means and the second fixing means which face each other.

[0009] The present invention provides a jig that can fix a tubular member and cut the tubular member along the direction in which the tubular member extends, even if the tubular member is a curved pipe. [Means for solving the problem]

[0010] The present invention [1] is a jig for cutting a tubular member along the extension direction of the tubular member, comprising: a first frame; a second frame arranged at an interval from the first frame; a first rotating member extending in the extension direction of the first frame and rotatable relative to the first frame; a second rotating member extending in the extension direction of the second frame and rotatable relative to the second frame; a first fixing means extending from the first rotating member in a direction perpendicular to the extension direction of the first rotating member and fixing one end of the tubular member; and a second fixing means extending from the second rotating member in a direction perpendicular to the extension direction of the second rotating member and fixing one end of the tubular member. The jig comprises a second fixing means for fixing the other end of the tubular member, and a connecting member extending in the direction in which the first frame and the second frame face each other and connecting the first frame and the second frame, wherein the first fixing means comprises a first inner support portion at one end of the tubular member that can abut against the inner surface of the tubular member, and a first outer support portion at one end of the tubular member that can abut against the outer surface of the tubular member, and the second fixing means comprises a second inner support portion at the other end of the tubular member that can abut against the inner surface of the tubular member, and a second outer support portion at the other end of the tubular member that can abut against the outer surface of the tubular member.

[0011] According to this configuration, one end of the tubular member can be fixed by the first fixing means (the first inner support portion and the first outer support portion), and the other end of the tubular member can be fixed by the second fixing means (the second inner support portion and the second outer support portion). The first fixing means is rotatable relative to the first frame in response to rotation of the first rotating member, and the second fixing means is rotatable relative to the second frame in response to rotation of the second rotating member. Therefore, the angle of the first fixing means relative to the first frame and the angle of the second fixing means relative to the second frame can be adjusted according to the shape of the tubular member (the bending angle of the tubular member). As a result, the tubular member can be fixed even if it is a curved pipe. This allows the tubular member to be cut along the extension direction of the tubular member.

[0012] Furthermore, at one end of the tubular member, the first inner support part abuts against the inner circumferential surface of the tubular member, and the first outer support part abuts against the outer circumferential surface of the tubular member, and at the other end of the tubular member, the second inner support part abuts against the inner circumferential surface of the tubular member, and the second outer support part abuts against the outer circumferential surface of the tubular member. In other words, the tubular member can be supported at the contact points between the first inner support part, the first outer support part, the second inner support part, and the second outer support part. This allows the tubular member to be fixed and cut along the extension direction of the tubular member, regardless of the shape of the edges at both ends of the tubular member.

[0013] The present invention [2] includes the jig described in [1] above, in which the inner diameter of one of the first frame and the first rotating member is larger than the outer diameter of the other, and one is fitted into the other, thereby allowing the first rotating member to rotate relative to the first frame, and the inner diameter of one of the second frame and the second rotating member is larger than the outer diameter of the other, and one is fitted into the other, thereby allowing the second rotating member to rotate relative to the second frame.

[0014] According to this configuration, with a simple structure, the first rotating member can be reliably rotated relative to the first frame, and the second rotating member can be reliably rotated relative to the second frame.

[0015] The present invention [3] is directed to a method for manufacturing a rotary member having a first inner support portion, a first outer support portion, and a first fixing member inserted into the first fixing hole, the first inner support portion including a first inner protrusion extending in a direction perpendicular to the direction in which the first rotary member extends, the first outer support portion including a first outer protrusion extending in parallel with the first inner protrusion at an interval from the first inner protrusion and having a first fixing hole, the first fixing member being inserted into the first fixing hole, the first inner support portion being opposed to the first outer protrusion and being capable of abutting against an inner circumferential surface of the tubular member, and the first fixing member being capable of abutting against an outer circumferential surface of the tubular member by inserting the first fixing member into the first fixing hole, the second inner support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first inner support portion being adapted to be connected to the rotary member and the first outer ... fixing member being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first fixing member being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first outer support portion being adapted to be connected to the rotary member and the first fixing member being adapted to The jig includes the jig described in [1] or [2] above, wherein the second outer support part has a second inner protrusion extending in a direction perpendicular to the direction in which the second rotating member extends, the second outer support part has a second outer protrusion extending parallel to the second inner protrusion at a distance from the second inner protrusion and having a second fixing hole, and a second fixing member inserted into the second fixing hole, the portion of the second inner protrusion facing the second outer protrusion can abut against the inner surface of the tubular member, and the second fixing member can abut against the outer surface of the tubular member by inserting it into the second fixing hole.

[0016] With this configuration, the tubular member can be more reliably fixed and cut along the direction in which the tubular member extends, regardless of the shape of the edges at both ends of the tubular member.

[0017] The present invention [4] includes the jig described in [3] above, in which the first inner protrusion and the first fixing member overlap in the insertion direction of the first fixing member, and the second inner protrusion and the second fixing member overlap in the insertion direction of the second fixing member.

[0018] According to this configuration, the tubular member can be reliably fixed (clamped) from both the inside and outside of the tubular member.

[0019] In particular, if the first inner protrusion and the first fixing member do not overlap in the insertion direction of the first fixing member, the abutting portion of the first inner protrusion on the inside of the tubular member and the abutting portion of the first fixing member on the outside of the tubular member differ, making the clamping of the tubular member unstable. On the other hand, with the above configuration, the abutting portion of the first inner protrusion on the inside of the tubular member and the abutting portion of the first fixing member on the outside of the tubular member overlap, making it possible to achieve stable clamping of the tubular member.

[0020] Similarly, if the second inner protrusion and the second fixing member do not overlap in the insertion direction of the second fixing member, the abutting portion of the second inner protrusion on the inside of the tubular member and the abutting portion of the second fixing member on the outside of the tubular member differ, making the clamping of the tubular member unstable. On the other hand, with the above configuration, the abutting portion of the second inner protrusion on the inside of the tubular member and the abutting portion of the second fixing member on the outside of the tubular member overlap, making it possible to achieve stable clamping of the tubular member.

[0021] As a result, the tubular member can be reliably fixed (clamped) from both the inside and outside of the tubular member.

[0022] The present invention [5] includes the jig described in [3] above, in which the first inner protrusion extends in a direction perpendicular to the direction in which the first inner protrusion extends and has a first protrusion that protrudes toward the inner surface of the tubular member, and the second inner protrusion extends in a direction perpendicular to the direction in which the second inner protrusion extends and has a second protrusion that protrudes toward the inner surface of the tubular member.

[0023] According to this configuration, the inner circumferential surface of the tubular member can be reliably supported by the first protruding portion and the second protruding portion.

[0024] Specifically, if the first inner protrusion does not have a first protrusion (for example, if the cross section of the first inner protrusion is substantially square), the contact area between the first inner protrusion and the inner circumferential surface of the tubular member increases, making the fixation unstable. On the other hand, with the above configuration, the first inner protrusion and the inner circumferential surface of the tubular member contact each other in a line. This allows for stable fixation.

[0025] Similarly, if the second inner protrusion did not have a second protrusion, the contact area between the second inner protrusion and the inner circumferential surface of the tubular member would increase, making the fixation unstable. On the other hand, with the above configuration, the second inner protrusion and the inner circumferential surface of the tubular member contact each other in a line, thereby achieving stable fixation.

[0026] As a result, the inner circumferential surface of the tubular member can be reliably supported by the first protruding portion and the second protruding portion.

[0027] The present invention [6] is directed to a method for manufacturing a rotary member having a first fixing member, the first fixing member comprising a first screw threaded into the first fixing hole and a first receiving portion that abuts against the outer circumferential surface of the tubular member, the first receiving portion comprising a first base portion fixed to a tip end of the first screw and a first abutment portion that extends parallel to the first inner protrusion and abuts against the outer circumferential surface of the tubular member, the length of the first abutment portion from the first base portion closer to the first rotary member in the direction in which the first abutment portion extends is longer than the length of the first abutment portion from the first base portion farther from the first rotary member, and the second fixing member The fixing member includes a second screw threaded into the second fixing hole and a second receiving portion that abuts against the outer surface of the tubular member, and the second receiving portion includes a second base portion fixed to the tip of the second screw and a second abutment portion that extends parallel to the second inner protrusion and abuts against the outer surface of the tubular member, and in the direction in which the second abutment portion extends, the length of the second abutment portion from the second base portion closer to the second rotating member is longer than the length of the second abutment portion from the second base portion farther from the second rotating member.

[0028] According to this configuration, the outer peripheral surface of the tubular member can be reliably supported by the first contact portion and the second contact portion.

[0029] In more detail, if the length of the first abutment portion that is closer to the first rotating member from the first pedestal in the direction in which the first abutment portion extends is shorter than the length of the first abutment portion that is farther from the first rotating member from the first pedestal, the fixation of the first abutment portion to the outer peripheral surface of the tubular member becomes unstable. On the other hand, with the above configuration, the length of the first abutment portion that is closer to the first rotating member from the first pedestal is longer than the length of the first abutment portion that is farther from the first rotating member from the first pedestal, so that stable fixation of the first abutment portion to the outer peripheral surface of the tubular member can be achieved.

[0030] Similarly, if the length of the second abutment portion closer to the second pedestal and the second rotating member in the direction in which the second abutment portion extends is shorter than the length of the second abutment portion farther from the second pedestal and the second rotating member, the fixation of the second abutment portion to the outer peripheral surface of the tubular member becomes unstable. On the other hand, with the above configuration, the length of the second abutment portion closer to the second pedestal and the second rotating member is longer than the length of the second abutment portion farther from the second pedestal and the second rotating member, so that the second abutment portion can be stably fixed to the outer peripheral surface of the tubular member.

[0031] As a result, the outer peripheral surface of the tubular member can be reliably supported by the first contact portion and the second contact portion.

[0032] The present invention [7] is directed to a method for manufacturing a tubular member, wherein the first fixing member comprises a first screw threaded into the first fixing hole and a first receiving portion that abuts against the outer circumferential surface of the tubular member, the first receiving portion comprises a first base portion fixed to a tip end of the first screw and a first abutment portion that extends parallel to the first inner protrusion and abuts against the outer circumferential surface of the tubular member, the length of the first abutment portion is 50% or more of the length of the first outer protrusion in the direction in which the first outer protrusion extends, and the second fixing member comprises a first fixing portion that abuts against the outer circumferential surface of the tubular member, the first fixing portion ... The fixing member includes a second screw threaded into the second fixing hole and a second receiving portion that abuts against the outer surface of the tubular member, the second receiving portion including a second base portion fixed to the tip of the second screw and a second abutment portion that extends parallel to the second inner protrusion and abuts against the outer surface of the tubular member, and the length of the second abutment portion in the direction of extension of the second outer protrusion is 50% or more of the length of the second outer protrusion.

[0033] According to this configuration, the area of ​​contact between the first contact portion and the outer circumferential surface of the tubular member can be increased in the direction in which the first outer protrusion extends.

[0034] Similarly, the area of ​​the second contact portion that contacts the outer circumferential surface of the tubular member can be increased in the direction in which the second outer protrusion extends.

[0035] This allows the first contact portion and the second contact portion to reliably support the outer peripheral surface of the tubular member. [Effects of the Invention]

[0036] According to the jig of the present invention, even when the tubular member is a curved pipe, the tubular member can be fixed and cut along the direction in which the tubular member extends. [Brief explanation of the drawings]

[0037] [Figure 1] FIG. 1 shows a schematic diagram of one embodiment of the jig of the present invention. [Figure 2] FIG. 2 shows an enlarged view of the connecting member of the jig of FIG. [Figure 3] FIG. 3 is a schematic diagram showing the jig of FIG. 1 in which the tubular member is a curved pipe (elbow pipe). [Figure 4] 4A to 4D show one embodiment of a method for using the jig of FIG. 1. FIG. 4A shows a first step of preparing the jig. FIG. 4B shows a second step of rotating the first and second rotating members and adjusting the left-right length of the connecting member to abut the first inner support member against the inner circumferential surface of the tubular member at one end and the second inner support member against the inner circumferential surface of the tubular member at the other end. FIG. 4C shows a third step of abutting the first outer support member against the outer circumferential surface of the tubular member at one end and the second outer support member against the outer circumferential surface of the tubular member at the other end. FIG. 4D shows a fourth step of cutting the tubular member along the extension direction of the tubular member. [Figure 5] FIG. 5 is a schematic diagram showing a modified example of the jig of the present invention (a jig in which the first rotating member is slidable in the vertical direction relative to the first frame, and the second rotating member is slidable in the vertical direction relative to the second frame). DETAILED DESCRIPTION OF THE INVENTION

[0038] An embodiment of the jig of the present invention will be described with reference to FIG.

[0039] In FIG. 1, the up-down direction on the paper surface is the up-down direction, with the upper side of the paper surface being the upper side (upper side in the up-down direction) and the lower side of the paper surface being the lower side (lower side in the up-down direction). The left-right direction on the paper surface is the direction perpendicular to the up-down direction, that is, the left-right direction. The right side of the paper surface is the right side (right side in the left-right direction), and the left side of the paper surface is the left side (left side in the left-right direction). Specifically, this is in accordance with the directional arrows in each figure. The depth direction is the direction perpendicular to the up-down direction and the left-right direction (hereinafter sometimes referred to as the depth direction). The front side of the paper surface is the front side (front side in the depth direction), and the back side of the paper surface is the back side (rear side in the depth direction).

[0040] <Jig> The jig 1 is a jig for cutting the tubular member 10 along the direction in which the tubular member 10 extends.

[0041] The tubular member 10 is a member having a tubular shape, and examples thereof include a straight pipe (straight shape) and a curved pipe. An example of a curved pipe is an elbow pipe. In FIG. 1, the tubular member 10 is a straight pipe. Furthermore, as will be described in detail later, even if the tubular member 10 is a curved pipe, the jig 1 can fix the tubular member 10 and cut the tubular member 10 along the direction in which the tubular member 10 extends.

[0042] The cross-sectional shape of the tubular member 10 is not particularly limited, and examples thereof include a rectangular shape, a square shape, a circle shape, and an ellipse shape.

[0043] Furthermore, the shape of the edges at both ends of the tubular member 10 is not particularly limited. More specifically, examples of the shape of the edges of the tubular member 10 include flat surfaces and uneven surfaces. These surfaces may be perpendicular to the extension direction of the tubular member 10, or may be inclined with respect to the extension direction of the tubular member 10. The shape of one end 11 and the shape of the other end 12 of the tubular member 10 may be the same or different from each other. In FIG. 1, the edges at both ends of the tubular member 10 have flat surfaces that are perpendicular to the extension direction of the tubular member 10.

[0044] Furthermore, as will be described in more detail later, the jig 1 can fix the tubular member 10 and cut the tubular member 10 along the direction in which the tubular member 10 extends, regardless of the shape of the edges at both ends of the tubular member 10.

[0045] The material constituting the tubular member 10 is not particularly limited, and examples thereof include metals and resins. Examples of metals include iron, copper, and aluminum. Examples of resins include polyolefin resins and polyester resins.

[0046] A preferred example of such a tubular member 10 is a pipe used in a nuclear reactor.

[0047] The length of the tubular member 10 in the direction in which the tubular member 10 extends is, for example, 10 cm to 100 cm.

[0048] The length of the tubular member 10 in a direction perpendicular to the direction in which the tubular member 10 extends (when the cross-sectional shape of the tubular member 10 is circular, the outer diameter) is, for example, 34.0 mm to 89.1 mm.

[0049] The weight of the jig 1 is, for example, 5 kg or less, or preferably 3 kg or less, and is usually 1 kg or more.

[0050] If the weight of the jig 1 is equal to or less than the above upper limit, the jig 1 is highly portable, and therefore the jig 1 can be carried to the work site and used there.

[0051] The jig 1 comprises a first frame 2, a second frame 3, a first rotating member 4, a second rotating member 5, a first fixing unit 6 as a first fixing means, a second fixing unit 7 as a second fixing means, and a connecting member 8.

[0052] [1st frame] The first frame 2 extends in the vertical direction.

[0053] The first frame 2 has a cylindrical shape. The inner diameter of the first frame 2 is larger than the outer diameter (described later) of the first rotating member 4. The inner diameter of the first frame 2 is, for example, 15 mm to 30 mm.

[0054] The ratio of the inner diameter of the first frame 2 to the outer diameter of the first rotary member 4 is, for example, greater than 1, preferably 1.1 or more, and, for example, 1.3 or less.

[0055] The length L1A (length in the vertical direction) of the first frame 2 is, for example, 15 cm to 20 cm.

[0056] [2nd frame] The second frame 3 extends in the vertical direction and is parallel to the first frame 2 in the left-right direction with a gap therebetween.

[0057] The second frame 3 has a cylindrical shape. The inner diameter of the second frame 3 is larger than the outer diameter (described later) of the second rotating member 5. The inner diameter of the second frame 3 is the same as the inner diameter of the first frame 2. The ratio of the inner diameter of the second frame 3 to the outer diameter of the second rotating member 5 is the same as the ratio of the inner diameter of the first frame 2 to the outer diameter of the first rotating member 4.

[0058] The length L1B (length in the vertical direction) of the second frame 3 is the same as the length L1A of the first frame 2.

[0059] [First rotating member] The first rotating member 4 extends in the direction in which the first frame 2 extends (the up-down direction).

[0060] The first rotating member 4 has a rod-like shape (cylindrical shape). The outer shape of the first rotating member 4 is smaller than the inner shape of the first frame 2. The outer shape of the first rotating member 4 is, for example, 13.8 mm to 21.7 mm.

[0061] Because the outer shape of the first rotating member 4 is smaller than the inner shape of the first frame 2 (because the inner shape of the first frame 2 is larger than the outer shape of the first rotating member 4), the first rotating member 4 is fitted into the first frame 2, thereby allowing the first rotating member 4 to rotate relative to the first frame 2. More specifically, the lower end of the first rotating member 4 is fitted into the upper end of the first frame 2. Furthermore, the first rotating member 4 is press-fitted (fixed) into the first frame 2 so as not to slide up and down. This allows the first rotating member 4 to slide and rotate in the horizontal direction (including the left-right and depth directions) relative to the first frame 2.

[0062] By rotating the first rotating member 4 , one end 11 of the tubular member 10 can be adjusted so that it can be supported by the first fixing unit 6 .

[0063] The length L2A (length in the vertical direction) of the first rotating member 4 is longer than the length L1A of the first frame 2, and is, for example, 20 cm to 25 cm.

[0064] [Second rotating member] The second rotating member 5 extends in the direction in which the second frame 3 extends (the up-down direction).

[0065] The second rotating member 5 has a rod-like shape (cylindrical shape). The outer shape of the second rotating member 5 is smaller than the inner shape of the second frame 3. The outer shape of the second rotating member 5 is the same as the outer shape of the first rotating member 4.

[0066] Because the outer shape of the second rotation member 5 is smaller than the inner shape of the second frame 3 (because the inner shape of the second frame 3 is larger than the outer shape of the second rotation member 5), the second rotation member 5 is fitted into the second frame 3, thereby allowing the second rotation member 5 to rotate relative to the second frame 3. More specifically, the lower end of the second rotation member 5 is fitted into the upper end of the second frame 3. Furthermore, the second rotation member 5 is press-fitted (fixed) to the second frame 3 so as not to slide up and down. This allows the second rotation member 5 to slide and rotate horizontally relative to the second frame 3.

[0067] By rotating the second rotating member 5, the other end 12 of the tubular member 10 can be adjusted so that it can be supported by the second fixing unit 7.

[0068] The length L2B (length in the vertical direction) of the second rotating member 5 is the same as the length L2A of the first rotating member 4.

[0069] [First fixed unit] The first fixing unit 6 fixes one end 11 of the tubular member 10 .

[0070] The first fixed unit 6 extends from the first rotating member 4 in a direction perpendicular to the direction in which the first rotating member 4 extends.

[0071] The first fixing unit 6 includes a first inner support portion 21 and a first outer support portion 22 .

[0072] The first inner support portion 21 is capable of abutting against the inner circumferential surface 13 of the tubular member 10 at one end 11 of the tubular member 10 .

[0073] The first inner support portion 21 includes a first inner protrusion portion 23 .

[0074] The first inner protrusions 23 are connected to the upper and lower elevated side ends of the first rotating member 4. The first inner support portions 21 extend from the upper and lower elevated side ends of the first rotating member 4 in a direction perpendicular to the extension direction of the first rotating member 4.

[0075] The first inner protrusion 23 has a rod-like shape. The first inner protrusion 23 has a generally diamond-shaped cross section (see the enlarged view in FIG. 1). One of the two diagonals of the generally diamond-shaped cross section of the first inner protrusion 23 runs along the extension direction (vertical direction) of the first rotating member 4, and the other runs along the rotation direction (horizontal direction) of the first rotating member 4. The first inner protrusion 23 extends in a direction perpendicular to the extension direction of the first inner protrusion 23 and includes a first protrusion 23A that protrudes toward the inner circumferential surface 13 of the tubular member 10. The first protrusion 23A is a lower corner of one of the diagonals (a diagonal running along the vertical direction) of the generally diamond-shaped cross section of the first inner protrusion 23.

[0076] The first protruding portion 23A is capable of abutting (line contacting) with the inner circumferential surface 13 of the tubular member 10 at one end 11 of the tubular member 10.

[0077] The length L3A (length in the left-right direction) of the first inner protrusion 23 is longer than the length L4A (described later) of the first outer protrusion 24. The length L3A (length in the left-right direction) of the first inner protrusion 23 is, for example, 3 cm to 5 cm.

[0078] The ratio (L3A / L4A) of the length L3A of the first inner protrusion 23 to the length L4A of the first outer protrusion 24 is, for example, greater than 1, preferably 1.1 or more, and, for example, 1.5 or less.

[0079] The thickness (length in the vertical direction) of the first inner protrusion 23 is shorter than half the length of the tubular member 10 in a direction perpendicular to the direction in which the tubular member 10 extends, and is, for example, 0.5 cm to 1 cm.

[0080] The first outer support portion 22 is capable of abutting against the outer peripheral surface 14 of the tubular member 10 at one end 11 of the tubular member 10. The first outer support portion 22 includes a first outer protrusion 24 and a first fixing member 25.

[0081] The first outer protrusion 24 is connected to the first rotating member 4 at a position vertically lower than the first inner protrusion 23 and vertically higher than the first frame 2. The first outer protrusion 24 extends parallel to the first inner protrusion 23 at a distance from it.

[0082] The first outer protrusion 24 has a rod-like shape (a rectangular pillar shape).

[0083] The length L4A (length in the left-right direction) of the first outer protrusion 24 is shorter than the length L3A of the first inner protrusion 23. The length L4A of the first outer protrusion 24 is, for example, 2 cm to 4 cm.

[0084] The first outer protrusion 24 has a first fixing hole 26 that penetrates in the up-down direction at its right end in the left-right direction. The first fixing hole 26 has a threaded inner periphery.

[0085] The first fixing member 25 includes a first screw 27 and a first receiving portion .

[0086] The first screw 27 is a thumbscrew. The first screw 27 is inserted into the first fixing hole 26 and screwed in such a way that the head of the first screw 27 faces downward in the vertical direction and the tip of the first screw 27 faces upward in the vertical direction.

[0087] The first receiving portion 28 is fixed to the tip end of the first screw 27. The first receiving portion 28 abuts against the outer peripheral surface 14 of the tubular member 10.

[0088] The first receiving portion 28 includes a first seat portion 28A and a first contact portion 28B.

[0089] A screw hole that opens downward in the vertical direction is provided on the underside of the first pedestal portion 28A, and the tip of a first screw 27 is screwed into the screw hole.

[0090] The first contact portion 28B is connected to the first pedestal portion 28A at the lower surface of the first contact portion 28B.

[0091] Specifically, the first abutment portion 28B and the first base portion 28A are connected so that, in the direction in which the first abutment portion 28B extends, the length L5A of the first abutment portion 28B that is closer to the first rotating member 4 from the first base portion 28A is longer than the length L6A of the first abutment portion 28B that is farther from the first rotating member 4 from the first base portion 28A.

[0092] The length L5A is, for example, 1 cm to 2 cm.

[0093] The length L6A is, for example, 0.5 cm to 1 cm.

[0094] The ratio of the length L5A to the length L6A (L5A / L6A) is, for example, greater than 1, preferably 1.5 or more, and, for example, 2 or less.

[0095] The length L7A of the first contact portion 28B (the length in the direction in which the first contact portion 28B extends) is, for example, 2 cm to 4 cm.

[0096] In addition, in the direction in which the first inner protrusion 23 extends, the length L7A of the first abutment portion 28B is, for example, 50% or more, preferably 75% or more, and, for example, 90% or less of the length L3A of the first inner protrusion 23.

[0097] Furthermore, the first inner protrusion 23 and the first fixing member 25 (specifically, the first abutment portion 28B) overlap in the insertion direction of the first fixing member 25.

[0098] In addition, in the direction in which the first outer protrusion 24 extends, the length L7A of the first abutment portion 28B is, for example, 50% or more, preferably 80% or more, and, for example, 95% or less of the length L4A of the first outer protrusion 24.

[0099] The portion 29 of the first inner protrusion 23 facing the first outer protrusion 24 can come into contact with the inner circumferential surface 13 of the tubular member 10 .

[0100] Furthermore, by inserting the first fixing member 25 into the first fixing hole 26, the first fixing member 25 can abut against the outer peripheral surface 14 of the tubular member 10. Specifically, by threading the first screw 27 of the first fixing member 25 into the first fixing hole 26, the first receiving portion 28 (first abutment portion 28B) faces upward in the vertical direction and can abut against the outer peripheral surface 14 of the tubular member 10.

[0101] More specifically, the first abutting portion 28B extends parallel to the first inner protruding portion 23. The first abutting portion 28B has a generally V-shaped cross section. A bottom portion of the generally V-shaped cross section of the first abutting portion 28B connects with the first seat portion 28A, and two upper ends abut against the outer peripheral surface 14 of the tubular member 10. As a result, at one end 11 of the tubular member 10, the first protruding portion 23A of the first inner protruding portion 23 is in line contact with the inner peripheral surface 13, and the two upper ends of the first abutting portion 28B are in line contact with the outer peripheral surface 14. As a result, the one end 11 of the tubular member 10 is supported at three points in the circumferential direction and is therefore stably clamped.

[0102] [Second fixed unit] The second fixing unit 7 fixes the other end 12 of the tubular member 10 .

[0103] The second fixed unit 7 extends from the second rotating member 5 in a direction perpendicular to the direction in which the second rotating member 5 extends.

[0104] The second fixing unit 7 includes a second inner support portion 31 and a second outer support portion 32 .

[0105] The second inner support portion 31 is capable of abutting against the inner circumferential surface 13 of the tubular member 10 at the other end 12 of the tubular member 10 .

[0106] The second inner support portion 31 includes a second inner protrusion portion 33 .

[0107] The second inner protrusions 33 are connected to the upper and lower elevated side ends of the second rotating member 5. The second inner support parts 31 extend from the upper and lower elevated side ends of the second rotating member 5 in a direction perpendicular to the extension direction of the second rotating member 5.

[0108] The second inner protrusion 33 has a rod-like shape. The second inner protrusion 33 has a generally diamond-shaped cross section (see the enlarged view in FIG. 1). One of the two diagonals of the generally diamond-shaped cross section of the second inner protrusion 33 runs along the extension direction (vertical direction) of the second rotating member 5, and the other runs along the rotation direction (horizontal direction) of the second rotating member 5. The second inner protrusion 33 includes a second protrusion 33A that extends in a direction perpendicular to the extension direction of the second inner protrusion 33 and protrudes toward the inner circumferential surface 13 of the tubular member 10. The second protrusion 33A is a lower corner of one of the diagonals (a diagonal running along the vertical direction) of the generally diamond-shaped cross section of the second inner protrusion 33.

[0109] The second protruding portion 33A is capable of abutting (line contacting) with the inner circumferential surface 13 of the tubular member 10 at the other end 12 of the tubular member 10.

[0110] The length L3B (length in the left-right direction) of the second inner protrusion 33 is longer than the length L4B (described later) of the second outer protrusion 34. The length L3B (length in the left-right direction) of the second inner protrusion 33 is the same as the length L3A of the first inner protrusion 23.

[0111] The ratio (L3B / L4B) of the length L3B of the second inner protrusion 33 to the length L4B of the second outer protrusion 34 is the same as the ratio (L3A / L4A) of the length L3A of the first inner protrusion 23 to the length L4A of the first outer protrusion 24.

[0112] The thickness (vertical length) of the second inner protrusion 33 is shorter than half the length of the tubular member 10 in a direction perpendicular to the extension direction of the tubular member 10, and is the same as the thickness of the first inner protrusion 23.

[0113] The second outer support portion 32 is capable of abutting against the outer peripheral surface 14 of the tubular member 10 at the other end 12 of the tubular member 10. The second outer support portion 32 includes a second outer protrusion 34 and a second fixing member 35.

[0114] The second outer protrusion 34 is connected to the second rotating member 4 below the second inner protrusion 33 in the vertical direction and above the second frame 3 in the vertical direction. The second outer protrusion 34 extends parallel to the second inner protrusion 33 at a distance.

[0115] The second outer protrusion 34 has a rod-like shape (a rectangular column shape).

[0116] The length L4B (length in the left-right direction) of the second outer protrusion 34 is shorter than the length L3B of the second inner protrusion 33. The length L4B of the second outer protrusion 34 is the same as the length L4A of the first outer protrusion 24.

[0117] The second outer protrusion 34 has a second fixing hole 36 that penetrates in the up-down direction at its left end in the left-right direction. The second fixing hole 36 has a threaded inner periphery.

[0118] The second fixing member 35 includes a second screw 37 and a second receiving portion 38.

[0119] The second screw 37 is a thumbscrew. The second screw 37 is inserted into the second fixing hole 36 and screwed in such a way that the head of the second screw 37 faces downward in the vertical direction and the tip of the second screw 37 faces upward in the vertical direction.

[0120] The second receiving portion is fixed to the tip end of the second screw 37. The second receiving portion comes into contact with the outer peripheral surface of the tubular member .

[0121] The second receiving portion 38 includes a second seat portion 38A and a second contact portion 38B.

[0122] A screw hole that opens downward in the vertical direction is provided on the lower surface of the second pedestal portion 38A, and the tip of a second screw 37 is screwed into the screw hole.

[0123] The second contact portion 38B is connected to the second pedestal portion 38A at the lower surface of the second contact portion 38B.

[0124] Specifically, the second abutment portion 38B and the second base portion 38A are connected so that, in the direction in which the second abutment portion 38B extends, the length L5B of the second abutment portion 38B that is closer to the second rotating member 5 from the second base portion 38A is longer than the length L6B of the second abutment portion 38B that is farther from the second rotating member 5 from the second base portion 38A.

[0125] The length L5B is the same as the length L5A (the length L5A from the first pedestal portion 28A to the first contact portion 28B closer to the first rotating member 4).

[0126] The length L6B is the same as the length L6A (the length L6A of the first contact portion 28B farther from the first pedestal portion 28A than the first rotating member 4).

[0127] The ratio (L5B / L6B) of the length L5B to the length L6B is the same as the ratio (L5A / L6A) of the length L5A to the length L6A.

[0128] The length L7B of the second contact portion 38B (the length in the direction in which the second contact portion 38B extends) is the same as the length L7A of the first contact portion 28B (the length in the direction in which the first contact portion 28B extends).

[0129] In addition, in the direction in which the second inner protrusion 33 extends, the length L7B of the second abutment portion 38B is, for example, 50% or more, preferably 75% or more, and, for example, 90% or less of the length L3B of the second inner protrusion 33.

[0130] Furthermore, the second inner protrusion 33 and the second fixing member 35 (specifically, the second abutment portion 38B) overlap in the insertion direction of the second fixing member 35.

[0131] In addition, in the direction in which the second outer protrusion 34 extends, the length L7B of the second abutment portion 38B is, for example, 50% or more, preferably 80% or more, and, for example, 95% or less of the length L4B of the second outer protrusion 34.

[0132] A portion 39 of the second inner protrusion 33 facing the second outer protrusion 34 can come into contact with the inner circumferential surface 13 of the tubular member 10 .

[0133] Furthermore, by inserting the second fixing member 35 into the second fixing hole 36, the second fixing member 35 can abut against the outer peripheral surface 14 of the tubular member 10. Specifically, by threading the second screw 37 of the second fixing member 35 into the second fixing hole 36, the second receiving portion 38 (second abutment portion 38B) faces upward in the vertical direction and can abut against the outer peripheral surface 14 of the tubular member 10.

[0134] More specifically, the second abutting portion 38B extends parallel to the second inner protruding portion 33. The second abutting portion 38B has a generally V-shaped cross section. A bottom portion of the generally V-shaped cross section of the second abutting portion 38B connects with the second seat portion 38A, and two upper ends abut against the outer peripheral surface 14 of the tubular member 10. As a result, at the other end 12 of the tubular member 10, the second protruding portion 33A of the second inner protruding portion 33 is in line contact with the inner peripheral surface 13, and the two upper ends of the second abutting portion 38B are in line contact with the outer peripheral surface 14. As a result, the other end 12 of the tubular member 10 is supported at three points in the circumferential direction and is therefore stably clamped.

[0135] [Connecting member] The connecting member 8 extends in the left-right direction and connects the first frame 2 and the second frame 3 together.

[0136] The connecting member 8 includes a first connecting member 41 and a second connecting member 42. The first connecting member 41 and the second connecting member 42 are configured to be slidable relative to each other. This allows the tubular member 10 to be fixed in place in accordance with the length of the tubular member 10 in the direction in which the tubular member 10 extends.

[0137] The first connecting member 41 has a horizontally flat plate shape. The first connecting member 41 is connected to the lower end of the first frame 2 in the up-down direction. The first connecting member 41 extends from the lower end of the first frame 2 in the up-down direction toward the right in the left-right direction. As shown in FIG. 2 , the first connecting member 41 has a groove 43 that extends in the left-right direction. The groove 43 is an elongated hole that occupies most of the center of the first connecting member 41.

[0138] The second connecting member 42 has a horizontally flat plate shape. The second connecting member 42 is connected to the lower end of the second frame 3 in the up-down direction. The second connecting member 42 extends from the lower end of the second frame 3 in the up-down direction toward the left in the left-right direction. The left-right length of the first connecting member 41 and the left-right length of the second connecting member 42 are the same.

[0139] The second connecting member 42 includes a fixing portion 44 in the left-right direction.

[0140] The fixing portion 44 has a male screw 44a and a female screw 44b. The male screw 44a is a screw that protrudes upward in the vertical direction from the second connecting member 42. The female screw 44b is a thumbscrew that screws into the male screw 44a. Because the male screw 44a protrudes upward in the vertical direction from the second connecting member 42 (because the male screw 44a does not protrude in the depth direction), once one side of the tubular member 10 is cut, the jig 1 can be turned over and the other side can be cut.

[0141] The second connecting member 42 and the first connecting member 41 are stacked on top of each other with the top facing up in the vertical direction. In this state, the male screw 44a protrudes upward from the groove 43. In other words, the fixing portion 44 is fitted into the groove 43. The female screw 44b is threadedly engaged with the male screw 44a.

[0142] Then, by loosening the female screw 44b of the fixing portion 44, the first connecting member 41 and the second connecting member 42 can slide (move in the left-right direction), while by tightening the female screw 44b of the fixing portion 44, the sliding (movement in the left-right direction) of the first connecting member 41 and the second connecting member 42 is fixed. This makes it possible to adjust the length of the connecting member 8 in the left-right direction to match the length of the tubular member 10 in the extension direction. This allows the tubular member 10 to be fixed in place to match the length of the tubular member 10 in the extension direction.

[0143] In the above description, the tubular member 10 is a straight pipe, but the tubular member 10 may be a curved pipe (elbow pipe) as shown in Fig. 3. In the following description, a method of using the jig 1 when the tubular member 10 is a curved pipe (elbow pipe) will be described in detail.

[0144] <How to use the jig> 4A to 4D, one embodiment of a method of using the jig (specifically, a method of using the jig to cut the tubular member along the extension direction of the tubular member 10) will be described.

[0145] A method of using the jig includes a first step of preparing the jig 1, a second step of rotating the first rotating member 4 and the second rotating member 5 and adjusting the left-right length of the connecting member 8 to abut the first inner support member 21 against the inner surface 13 of the tubular member 10 at one end 11 of the tubular member 10 and abut the second inner support member 31 against the inner surface 13 of the tubular member 10 at the other end 12 of the tubular member 10, a third step of abutting the first outer support member 22 against the outer surface 14 of the tubular member 10 at one end 11 of the tubular member 10 and abutting the second outer support member 32 against the outer surface 14 of the tubular member 10 at the other end 12 of the tubular member 10, and a fourth step of cutting the tubular member 10 along the direction in which the tubular member 10 extends.

[0146] [1st step] In the first step, a jig 1 is prepared as shown in FIG. 4A.

[0147] [Second process] In the second step, as shown in Figure 4B, the first rotating member 4 and the second rotating member 5 are rotated, and the left-right length of the connecting member 8 is adjusted so that the first inner support portion 21 abuts against the inner surface 13 of the tubular member 10 at one end 11 of the tubular member 10, and the second inner support portion 31 abuts against the inner surface 13 of the tubular member 10 at the other end 12 of the tubular member 10.

[0148] Specifically, first, the first rotating member 4 and the second rotating member 5 are rotated to adjust the angle at which both ends of the tubular member 10 can be supported by the first fixing unit 6 and the second fixing unit 7. More specifically, the first rotating member 4 and the second rotating member 5 are rotated so that the extension direction of the first inner protrusion 23 is aligned with the direction in which one end 11 of the tubular member 10 faces, and the extension direction of the second inner protrusion 33 is aligned with the direction in which the other end 12 of the tubular member 10 faces.

[0149] At the same time, the left-right length of the connecting member 8 is adjusted. Specifically, by loosening the female screw 44b of the fixing portion 44, the first connecting member 41 and the second connecting member 42 are slid to adjust the left-right length of the connecting member 8 to correspond to the length of the tubular member 10 connecting one end 11 of the tubular member 10 to the other end 12 of the tubular member 10, and then by tightening the female screw 44b of the fixing portion 44, the sliding (left-right movement) of the first connecting member 41 and the second connecting member 42 is fixed. In this way, the left-right length of the connecting member 8 is adjusted to correspond to the length of the straight line of the tubular member 10 connecting one end 11 of the tubular member 10 to the other end 12 of the tubular member 10, and the left-right length between the first frame 2 and the second frame 3 is fixed.

[0150] At this time, the first inner support portion 21 abuts against the inner surface 13 of the tubular member 10 at one end 11 of the tubular member 10, and the second inner support portion 31 abuts against the inner surface 13 of the tubular member 10 at the other end 12 of the tubular member 10.

[0151] [3rd step] In the third step, as shown in Figure 4C, a first outer support part 22 is abutted against the outer peripheral surface 14 of the tubular member 10 at one end 11 of the tubular member, and a second outer support part 32 is abutted against the outer peripheral surface 14 of the tubular member 10 at the other end 12 of the tubular member 10.

[0152] Specifically, at one end 11 of the tubular member, by threading the first screw 27 of the first fixing member 25, the first fixing member 25 is moved from the vertical lower side to the vertical upper side, and the first receiving portion 28 of the first fixing member 25 is brought into contact with the outer peripheral surface 14 of the tubular member 10, and at the other end 12 of the tubular member, by threading the second screw 37 of the second fixing member 35, the second fixing member 35 is moved from the vertical lower side to the vertical upper side, and the second receiving portion 38 of the second fixing member 35 is brought into contact with the outer peripheral surface 14 of the tubular member 10. In this way, the jig 1 clamps the tubular member 10 from the inside (inner peripheral surface 13) and the outside (outer peripheral surface 14) of the tubular member 10.

[0153] [4th step] In the fourth step, as shown in FIG. 4D, the tubular member 10 is cut along the direction in which the tubular member 10 extends.

[0154] Specifically, the jig 1 is fixed with a vice or the like, and then the tubular member 10 is cut along the direction in which the tubular member 10 extends using a cutting device such as a band saw.

[0155] <Action and effect> (1) With the jig 1, one end 11 of the tubular member 10 can be fixed by the first fixing means 6 (the first inner support portion 21 and the first outer support portion 22), and the other end 12 of the tubular member 10 can be fixed by the second fixing means 7 (the second inner support portion 31 and the second outer support portion 32). The first fixing means 6 is rotatable relative to the first frame 2 in response to the rotation of the first rotating member 4, and the second fixing means 7 is rotatable relative to the second frame 3 in response to the rotation of the second rotating member 5. Therefore, the angle of the first fixing means 6 relative to the first frame 2 and the angle of the second fixing means 7 relative to the second frame 3 can be adjusted in accordance with the shape of the tubular member 10 (the bending angle of the tubular member 10). As a result, even if the tubular member 10 is a curved pipe, the tubular member 10 can be fixed. This allows the tubular member 10 to be cut along the extension direction of the tubular member 10.

[0156] Furthermore, at one end of the tubular member 10, the first inner support portion 21 abuts against the inner circumferential surface 13 of the tubular member 10, and the first outer support portion 22 abuts against the outer circumferential surface 14 of the tubular member 10, and at the other end of the tubular member 10, the second inner support portion 31 abuts against the inner circumferential surface 13 of the tubular member 10, and the second outer support portion 32 abuts against the outer circumferential surface 14 of the tubular member 10. In other words, the jig 1 can support the tubular member 10 at the portions where the first inner support portion 21, the first outer support portion 22, the second inner support portion 31, and the second outer support portion 32 abut. Therefore, regardless of the shapes of the edges at both ends of the tubular member 10, the tubular member 10 can be fixed and cut along the extension direction of the tubular member 10.

[0157] (2) According to the jig 1, the inner diameter of the first frame 2 is larger than the outer diameter of the first rotating member 4, and when the first rotating member 4 is fitted into the first frame 2, the first rotating member 4 becomes rotatable relative to the first frame 2; the inner diameter of the second frame 3 is larger than the outer diameter of the second rotating member 5, and when the second rotating member 5 is fitted into the second frame 3, the second rotating member 5 becomes rotatable relative to the second frame 3.

[0158] This makes it possible to reliably rotate the first rotating member 4 relative to the first frame 2, and also to reliably rotate the second rotating member 5 relative to the second frame 3, with a simple configuration.

[0159] (3) According to the jig 1, the first inner support portion 21 includes a first inner protrusion 23 extending in a direction perpendicular to the direction in which the first rotating member 4 extends, and the first outer support portion 22 includes a first outer protrusion 24 extending parallel to and spaced apart from the first inner protrusion 23 and having a first fixing hole 26, and a first fixing member 25 inserted into the first fixing hole 26, and a portion 29 of the first inner protrusion 23 facing the first outer protrusion 24 can abut against the inner circumferential surface 13 of the tubular member 10, and by inserting the first fixing member 25 into the first fixing hole 26, the first fixing member 25 abuts against the outer circumferential surface 14 of the tubular member 10. The second inner support portion 31 has a second inner protrusion 33 extending in a direction perpendicular to the direction in which the second rotating member 5 extends, the second outer support portion 32 extends parallel to and spaced from the second inner protrusion 33 and has a second outer protrusion 34 having a second fixing hole 36, and a second fixing member 35 inserted into the second fixing hole 36, and a facing portion 39 of the second inner protrusion 33 facing the second outer protrusion 34 is able to abut against the inner surface 13 of the tubular member 10, and by inserting the second fixing member 35 into the second fixing hole 36, the second fixing member 35 is able to abut against the outer surface 14 of the tubular member 10.

[0160] This makes it possible to more reliably fix the tubular member 10 and cut the tubular member 10 along the direction in which the tubular member 10 extends, regardless of the shape of the edges at both ends of the tubular member 10.

[0161] (4) According to the jig 1, the first inner protrusion 23 and the first fixing member 25 overlap in the insertion direction of the first fixing member 25, and the second inner protrusion 33 and the second fixing member 35 overlap in the insertion direction of the second fixing member 35.

[0162] This allows the tubular member 10 to be reliably fixed (clamped) from the inside and the outside of the tubular member 10.

[0163] More specifically, if the first inner protrusion 23 and the first fixing member 25 do not overlap in the insertion direction of the first fixing member 25, the abutting portion of the first inner protrusion 23 on the inside of the tubular member 10 and the abutting portion of the first fixing member 25 on the outside of the tubular member 10 differ, resulting in unstable clamping of the tubular member 10. On the other hand, with the jig 1, the abutting portion of the first inner protrusion 23 on the inside of the tubular member 10 and the abutting portion of the first fixing member 25 on the outside of the tubular member 10 overlap, thereby achieving stable clamping of the tubular member 10.

[0164] Similarly, if the second inner protrusion 33 and the second fixing member 35 do not overlap in the insertion direction of the second fixing member 35, the abutting portion of the second inner protrusion 33 on the inside of the tubular member 10 and the abutting portion of the second fixing member 35 on the outside of the tubular member 10 will differ, resulting in unstable clamping of the tubular member 10. On the other hand, with the jig 1, the abutting portion of the second inner protrusion 33 on the inside of the tubular member 10 and the abutting portion of the second fixing member 35 on the outside of the tubular member 10 overlap in the up-down direction, thereby achieving stable clamping of the tubular member 10.

[0165] As a result, the tubular member 10 can be reliably fixed (clamped) from the inside and the outside of the tubular member 10.

[0166] (5) According to the jig 1, the first inner protrusion 23 extends in a direction perpendicular to the extension direction of the first inner protrusion 23 and has a first protrusion 23A that protrudes toward the inner surface 13 of the tubular member 10, and the second inner protrusion 33 extends in a direction perpendicular to the extension direction of the second inner protrusion 33 and has a second protrusion 33A that protrudes toward the inner surface 13 of the tubular member 10.

[0167] This allows the inner circumferential surface 13 of the tubular member 10 to be reliably supported by the first protruding portion 23A and the second protruding portion 33A.

[0168] More specifically, if the first inner protrusion 23 does not have the first protrusion 23A (for example, if the cross section of the first inner protrusion 23 is substantially square), the contact area between the first inner protrusion 23 and the inner circumferential surface 13 of the tubular member 10 increases, making the fixation unstable. On the other hand, with the jig 1, the first protrusion 23A of the first inner protrusion 23 contacts the inner circumferential surface 13 of the tubular member 10 in a line. This allows for stable fixation.

[0169] Similarly, if the second inner protrusion 33 did not have the second protrusion 33A, the contact area between the second inner protrusion 33 and the inner circumferential surface 13 of the tubular member 10 would increase, making the fixation unstable. On the other hand, with the jig 1, the second protrusion 33A of the second inner protrusion 33 comes into contact with the inner circumferential surface 13 of the tubular member 10 in a line. This allows for stable fixation.

[0170] As a result, the inner circumferential surface 13 of the tubular member 10 can be reliably supported by the first protruding portion 23A and the second protruding portion 33A.

[0171] Furthermore, according to the jig 1, at one end 11 of the tubular member 10, the first inner protrusion 23 (first protrusion 23A) abuts against the inner surface 13 of the tubular member 10, and the upper end of the first abutment portion 28B, which is approximately V-shaped in cross section, abuts against the outer surface 14 of the tubular member 10, so that the one end 11 of the tubular member 10 can be reliably supported.

[0172] Furthermore, at the other end 12 of the tubular member 10, the second inner protrusion 33 (second protrusion 33A) abuts against the inner surface 13 of the tubular member 10, and the upper end of the second abutment portion 38B, which is approximately V-shaped in cross section, abuts against the outer surface 14 of the tubular member 10, thereby ensuring support of the other end 12 of the tubular member 10.

[0173] (6) According to the jig 1, the first fixing member 25 includes a first screw 27 threaded into the first fixing hole 26 and a first receiving portion 28 that abuts against the outer peripheral surface 14 of the tubular member 10. The first receiving portion 28 includes a first base portion 28A that is fixed to the tip end of the first screw 27 and a first abutment portion 28B that extends parallel to the first inner protrusion 23 and abuts against the outer peripheral surface 14 of the tubular member 10. In the direction in which the first abutment portion 28B extends, a length L5A of the first abutment portion 28B that is closer to the first rotating member 4 from the first base portion 28A is longer than a length L6A of the first abutment portion 28B that is farther from the first rotating member 4. The second fixing member 35 has a second screw 37 threaded into the second fixing hole 36 and a second receiving portion 38 that abuts against the outer peripheral surface 14 of the tubular member 10, and the second receiving portion 38 has a second base portion 38A fixed to the tip of the second screw 37 and a second abutment portion 38B that extends parallel to the second inner protrusion 33 and abuts against the outer peripheral surface 14 of the tubular member 10, and in the direction in which the second abutment portion 38B extends, a length L5B of the second abutment portion 38B that is closer to the second base portion 38A than a length L6B of the second abutment portion 38B that is farther from the second base portion 38A than the second rotating member 5.

[0174] This allows the outer peripheral surface 14 of the tubular member 10 to be reliably supported by the first contact portion 28B and the second contact portion 38B.

[0175] Specifically, if the length L5A is shorter than the length L6A, the first contact portion 28B will not be fixed to the outer peripheral surface 14 of the tubular member 10 in an unsteady manner. On the other hand, with the jig 1, the length L5A is longer than the length L6A, and therefore the first contact portion 28B can be fixed to the outer peripheral surface 14 of the tubular member 10 in a stable manner.

[0176] Similarly, if the length L5B is shorter than the length L6B, the second abutment portion 38B will not be fixed to the outer peripheral surface 14 of the tubular member 10 in an unsteady manner. On the other hand, with the jig 1, the length L5B is longer than the length L6B, and therefore the second abutment portion 38B can be fixed to the outer peripheral surface 14 of the tubular member 10 in a stable manner.

[0177] As described above, the outer peripheral surface 14 of the tubular member 10 can be reliably supported by the first contact portion 28B and the second contact portion 38B.

[0178] (7) According to the jig 1, in the direction in which the first outer protrusion 24 extends, the length L7A of the first abutment portion 28B is 50% or more of the length L4A of the first outer protrusion 24, and in the direction in which the second outer protrusion 34 extends, the length L7B of the second abutment portion 38B is 50% or more of the length L4B of the second outer protrusion 34.

[0179] According to the jig 1, the area of ​​contact between the first abutting portion 28B and the outer circumferential surface 14 of the tubular member 10 in the direction in which the first outer protrusion 24 extends can be increased.

[0180] Similarly, the area in which the second contact portion 38B contacts the outer circumferential surface 14 of the tubular member 10 in the direction in which the second outer protrusion 34 extends can be increased.

[0181] This allows the outer peripheral surface 14 of the tubular member 10 to be reliably supported by the first contact portion 28B and the second contact portion 38B.

[0182] <Modification> In the modified example, the same components and steps as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted. Furthermore, the modified example can achieve the same effects as those in the first embodiment unless otherwise specified. Furthermore, the first embodiment and its modified example can be combined as appropriate.

[0183] In the above description, the first frame 2 has a cylindrical shape, the inner diameter of the first frame 2 is larger than the outer diameter of the first rotating member 4, and the first rotating member 4 is fitted into the first frame 2, thereby allowing the first rotating member 4 to rotate relative to the first frame 2.However, the first rotating member 4 can also have a cylindrical shape, the inner diameter of the first rotating member 4 is larger than the outer diameter of the first frame 2, and the first frame 2 is fitted into the first rotating member 4, thereby allowing the first rotating member 4 to rotate relative to the first frame 2.

[0184] In other words, in the jig 1, the inner diameter of one of the first frame 2 and the first rotating member 4 is larger than the outer diameter of the other, and by fitting one into the other, the first rotating member 4 can rotate relative to the first frame 2.

[0185] In the above description, the second frame 3 has a cylindrical shape, the inner diameter of the second frame 3 is larger than the outer diameter of the second rotating member 5, and the second rotating member 5 is fitted into the second frame 3, thereby allowing the second rotating member 5 to rotate relative to the second frame 3.However, the second rotating member 5 can also have a cylindrical shape, the inner diameter of the second rotating member 5 is larger than the outer diameter of the second frame 3, and the second frame 3 is fitted into the second rotating member 5, thereby allowing the second rotating member 5 to rotate relative to the second frame 3.

[0186] In other words, in the jig 1, the inner diameter of one of the second frame 3 and the second rotating member 5 is larger than the outer diameter of the other, and by fitting one into the other, the second rotating member 5 can rotate relative to the second frame 3.

[0187] In the above description, the first inner protrusion 23 has an approximately diamond shape in cross section, but the shape of the first inner protrusion 23 is not particularly limited as long as it has the first protrusion 23A, and may be, for example, an inverted triangle shape in cross section or a home plate shape in cross section.

[0188] In the above description, the second inner protrusion 33 has an approximately diamond shape in cross section, but the shape of the second inner protrusion 33 is not particularly limited as long as it has a second protrusion 33A, and may be, for example, an inverted triangle shape in cross section or a home plate shape in cross section.

[0189] In the above description, the first inner protrusion 23 and the second inner protrusion 33 have the first protrusion 23A and the second protrusion 33A, respectively, but the first inner protrusion 23 and the second inner protrusion 33 do not necessarily have the first protrusion 23A and the second protrusion 33A, respectively.

[0190] In the above description, the second connecting member 42 has a groove 43 and the first connecting member 41 has a fixing portion 44, but it is also possible for the first connecting member 41 to have a groove 43 and the second connecting member 42 to have a fixing portion 44.

[0191] That is, one of the first connecting member 41 and the second connecting member 42 has a groove 43 , and the other has a fixing portion 44 that fits into the groove 43 .

[0192] In the above description, the first fixing member 25 includes the first screw 27 and the first receiving portion 28, but the first fixing member 25 may also be composed of only the first screw 27 without including the first receiving portion 28. In such a case, as the first screw 27 threads forward, the tip of the first screw 27 abuts against the outer peripheral surface 14 of the tubular member 10. The same applies to the second fixing member 35.

[0193] In the above description, the first rotating member 4 is press-fitted (fixed) to the first frame 2 so as not to slide in the vertical direction, and the second rotating member 5 is press-fitted (fixed) to the second frame 3 so as not to slide in the vertical direction. However, as shown in FIG. 5 , the first rotating member 4 may be slidable in the vertical direction relative to the first frame 2, and the second rotating member 5 may be slidable in the vertical direction relative to the second frame 3. In such a case, after the vertical position of the first rotating member 4 is adjusted relative to the first frame 2, the first rotating member 4 is fixed with the screws 51. Similarly, the vertical position of the second rotating member 5 is adjusted relative to the second frame 3, and after positioning, it is fixed with the screws 51.

[0194] In addition to straight or curved pipes, such a jig 1 can also fix tubular members 10 having curved shapes whose ends (one end 11 and the other end 12) do not coincide in the vertical direction.

[0195] Specifically, the vertical position of the first rotating member 4 is adjusted relative to the first frame 2, thereby adjusting the vertical position of the first fixing unit 6 to match one end 11 of the tubular member 10, and / or the vertical position of the second rotating member 5 is adjusted relative to the second frame 3, thereby adjusting the vertical position of the second fixing unit 7 to match the other end 12 of the tubular member 10, thereby fixing the tubular member 10. [Explanation of symbols]

[0196] 1 Jig 2 First frame 3 Second frame 4. First rotating member 5 Fifth rotating member 6 First fixed unit 7 Second fixed unit 8 Connecting members 10 Tubular member 11 one end 12 other end 13 Inner surface 14 Outer surface 21 First inner support part 22 First outer support part 23 First inner protrusion 23A 1st protrusion 24 First outer protrusion 25 First fixing member 26 1st fixing hole 27 First screw 28 First receiving part 28A First base 28B 1st contact part 31 Second inner support part 32 Second outer support part 33 Second inner protrusion 33A 2nd protrusion 34 Second outer protrusion 35 Second fixing member 36 2nd fixing hole 37 Second screw 38 Second receiving part 38A Second base 38B 2nd contact part

Claims

1. A jig for cutting a tubular member along an extension direction of the tubular member, A first frame; a second frame disposed at an interval from the first frame; a first rotating member extending in a direction in which the first frame extends and being rotatable relative to the first frame; a second rotating member extending in a direction in which the second frame extends and being rotatable relative to the second frame; a first fixing means extending from the first rotating member in a direction perpendicular to the extending direction of the first rotating member and fixing one end of the tubular member; a second fixing means extending from the second rotating member in a direction perpendicular to the extending direction of the second rotating member and fixing the other end of the tubular member; a connecting member extending in a direction in which the first frame and the second frame face each other and connecting the first frame and the second frame, the first fixing means includes a first inner support portion at one end of the tubular member, the first inner support portion being capable of contacting an inner circumferential surface of the tubular member, and a first outer support portion at one end of the tubular member, the first outer support portion being capable of contacting an outer circumferential surface of the tubular member, The second fixing means is a jig that includes a second inner support portion at the other end of the tubular member that can abut against the inner surface of the tubular member, and a second outer support portion at the other end of the tubular member that can abut against the outer surface of the tubular member.

2. an inner diameter of one of the first frame and the first rotating member is larger than an outer diameter of the other, By fitting one into the other, the first rotation member becomes rotatable relative to the first frame, an inner diameter of one of the second frame and the second rotating member is larger than an outer diameter of the other, The jig according to claim 1 , wherein the second rotating member is rotatable relative to the second frame by fitting one of the second rotating members into the other.

3. the first inner support portion includes a first inner protrusion extending in a direction perpendicular to a direction in which the first rotating member extends, the first outer support portion includes a first outer protrusion extending parallel to and spaced apart from the first inner protrusion and having a first fixing hole; and a first fixing member inserted into the first fixing hole, a portion of the first inner protrusion facing the first outer protrusion capable of abutting against an inner circumferential surface of the tubular member, the first fixing member is inserted into the first fixing hole, so that the first fixing member can come into contact with an outer peripheral surface of the tubular member; the second inner support portion includes a second inner protrusion extending in a direction perpendicular to a direction in which the second rotating member extends, the second outer support portion includes a second outer protrusion extending parallel to and spaced apart from the second inner protrusion and having a second fixing hole; and a second fixing member inserted into the second fixing hole, a portion of the second inner protrusion facing the second outer protrusion capable of abutting against an inner circumferential surface of the tubular member, The jig according to claim 1 , wherein the second fixing member is capable of contacting an outer peripheral surface of the tubular member by inserting the second fixing member into the second fixing hole.

4. the first inner protrusion and the first fixing member overlap in the insertion direction of the first fixing member, The jig according to claim 3 , wherein the second inner protrusion and the second fixing member overlap in an insertion direction of the second fixing member.

5. the first inner protrusion extends in a direction perpendicular to the direction in which the first inner protrusion extends and includes a first protrusion that protrudes toward an inner circumferential surface of the tubular member, The jig according to claim 3 , wherein the second inner protrusion includes a second protrusion extending in a direction perpendicular to the direction in which the second inner protrusion extends and protruding toward an inner circumferential surface of the tubular member.

6. the first fixing member includes a first screw threaded into the first fixing hole and a first receiving portion that abuts against an outer circumferential surface of the tubular member; the first receiving portion includes a first seat portion fixed to a tip end portion of the first screw, and a first abutment portion extending parallel to the first inner protrusion and abutting against an outer peripheral surface of the tubular member, In a direction in which the first contact portion extends, a length of the first contact portion from the first base portion closer to the first rotating member is longer than a length of the first contact portion from the first base portion farther from the first rotating member, the second fixing member includes a second screw threaded into the second fixing hole and a second receiving portion that abuts against an outer circumferential surface of the tubular member, the second receiving portion includes a second seat portion fixed to a tip end portion of the second screw, and a second abutment portion extending parallel to the second inner protrusion and abutting against an outer peripheral surface of the tubular member, 4. The jig described in claim 3, wherein, in the direction in which the second abutment portion extends, the length of the second abutment portion from the second base portion closer to the second rotating member is longer than the length of the second abutment portion from the second base portion farther from the second rotating member.

7. the first fixing member includes a first screw threaded into the first fixing hole and a first receiving portion that abuts against an outer circumferential surface of the tubular member; the first receiving portion includes a first seat portion fixed to a tip end portion of the first screw, and a first abutment portion extending parallel to the first inner protrusion and abutting against an outer peripheral surface of the tubular member, In the extending direction of the first outer protrusion, the length of the first abutting portion is 50% or more of the length of the first outer protrusion, the second fixing member includes a second screw threaded into the second fixing hole and a second receiving portion that abuts against an outer circumferential surface of the tubular member, the second receiving portion includes a second seat portion fixed to a tip end portion of the second screw, and a second abutment portion extending parallel to the second inner protrusion and abutting against an outer peripheral surface of the tubular member, The jig according to claim 3 , wherein the length of the second abutting portion in the direction in which the second outer protrusion extends is 50% or more of the length of the second outer protrusion.

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