Clamping device and flaring tool

Abstract

To provide a clamping device that can firmly hold a pipe using a simple method. [Solution] A clamping device that can be attached to a flare forming apparatus is provided. This clamping device comprises a main body including a first main body and a second main body, a first connecting part that rotatably connects the first main body and the second main body, and an operating mechanism that is rotatably connected to the first main body and the second main body, and that uses a force amplification mechanism to switch the first main body and the second main body between (i) a closed position in which the first main body and the second main body are close to each other and clamp holes are formed in the main body, and (ii) an open position in which the first main body and the second main body are separated.

Description

Technical Field

[0001] The present disclosure relates to a clamping device and a flare forming tool.

Background Art

[0002] A clamping device for fixing a pipe to a flare forming device for forming a flare at an end of the pipe is known. For example, Patent Document 1 discloses a clamping device in which a pair of holding pieces that can be opened and closed form a holding hole when closed. The pair of holding pieces are biased in a direction in which the holding pieces close by a torsion spring, and the pipe disposed in the holding hole is clamped by the biasing force of the torsion spring.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional technology, in order to dispose a pipe in the holding hole, a force against the torsion spring must be applied to separate the pair of holding pieces from each other. Further, in the conventional technology, the pipe is held by the biasing force of the torsion spring, and there is a possibility that the pipe is not sufficiently fixed. Therefore, the position of the pipe disposed in the holding hole may be displaced before the clamping device is attached to the flare forming device.

[0005] One non-limiting object of the present disclosure is to provide a clamping device that can firmly hold a pipe in a simple manner.

Means for Solving the Problems

[0006] According to one non-limiting aspect of the present disclosure, a clamping device that can be attached to a flaring apparatus is provided. The clamping device comprises a body portion including a first body portion and a second body portion; a first connecting portion that rotatably connects the first body portion and the second body portion; and an operating mechanism that is rotatably connected to the first body portion and the second body portion and that, using a force amplification mechanism, can switch the first body portion and the second body portion between (i) a closed position in which the first body portion and the second body portion are close to each other and clamping holes are formed in the body portions; and (ii) an open position in which the first body portion and the second body portion are separated.

[0007] According to the clamping device of this embodiment, a pipe can be held in the clamping hole with a large force through simple operation using a force-multiplier mechanism.

[0008] According to one other non-limiting aspect of the present disclosure, an electric flaring tool is provided, comprising a flaring device for forming a flare at the end of a pipe and a clamping device as described in the above aspect.

[0009] According to this embodiment, the pipe can be held in the clamp hole with a large force through a simple operation using a force-amplifying mechanism, and the problem of the pipe shifting position before the clamping device is attached to the flaring device can be suppressed or prevented. [Brief explanation of the drawing]

[0010] [Figure 1] A perspective view showing the external configuration of a flare forming tool according to the first embodiment. [Figure 2] A cross-sectional view showing the internal structure of a flaring tool. [Figure 3] A cross-sectional view showing the internal structure of a flare forming device. [Figure 4] An explanatory diagram showing the configuration of the front part of the clamping device in the closed position. [Figure 5] An explanatory diagram showing the configuration of the back of the clamping device in the closed position. [Figure 6] A perspective view showing the configuration of the clamping device in the closed position. [Figure 7] Perspective view showing the configuration of the clamping device in the open position. [Figure 8] Explanatory drawing showing the configuration of the first groove portion of the first main body portion. [Figure 9] Cross-sectional view of the clamping device at the IX-IX position shown in FIG. 8. [Figure 10] First explanatory drawing showing the fixing method of the clamping device and the clamp mounting portion. [Figure 11] Second explanatory drawing showing the fixing method of the clamping device and the clamp mounting portion. [Figure 12] Third explanatory drawing showing the fixing method of the clamping device and the clamp mounting portion. [Figure 13] Fourth explanatory drawing showing the fixing method of the clamping device and the clamp mounting portion. [Figure 14] Cross-sectional view of the XIV-XIV position shown in FIG. 13. [Figure 15] Explanatory drawing showing the operation method of the operation portion. [Figure 16] Fifth explanatory drawing showing the fixing method of the clamping device and the clamp mounting portion. [Figure 17] Explanatory drawing showing the clamp mounting portion at the first rotation angle. [Figure 18] Exploded perspective view showing the connection structure between the main housing and the clamp mounting portion. [Figure 19] Cross-sectional view of the XIX-XIX position shown in FIG. 17. [Figure 20] Cross-sectional view showing the method of releasing the fixing of the clamp mounting portion to the rotation fixing portion. [Figure 21] Explanatory drawing showing the configuration of the rotation fixing portion. [Figure 22] Explanatory drawing showing the clamp mounting portion at the second rotation angle. [Figure 23] Explanatory drawing showing the clamp mounting portion at the third rotation angle. [Figure 24] Explanatory drawing showing the clamp mounting portion at the fourth rotation angle. [Figure 25] Explanatory drawing showing the clamp mounting portion at the fifth rotation angle. [Figure 26] Explanatory drawing showing the clamp mounting portion at the sixth rotation angle. [Modes for carrying out the invention]

[0011] In one non-limiting embodiment of the present disclosure, the first main body may include a positioning pin that can be fitted into a first fitting hole formed in the flare forming apparatus. The positioning pin may be configured to move inside the first main body and be switchable between (i) a protruding position that protrudes outward from the first main body and can be fitted into the first fitting hole, and (ii) a housing position that is housed in the first main body. According to this embodiment, the clamping device can be fixed to the flare forming device by a simple configuration in which a positioning pin is moved and fitted into the first fitting hole.

[0012] In addition to or in lieu of the above embodiments, the first main body may further include a first opposing portion that faces the second main body in the closed position, and a fixing pin that protrudes outward from the first opposing portion. The second main body may include a second opposing portion that faces the first opposing portion in the closed position, and a second fitting hole provided in the second opposing portion that can be fitted with the fixing pin in the closed position. The fixing pin may be integrated with the positioning pin. According to this embodiment, the fixing pin facilitates alignment between the first main body and the second main body, and by integrating the positioning pin and the fixing pin, the number of parts in the clamping device can be reduced.

[0013] In addition to or in lieu of the above embodiments, the clamping device may further include a biasing member that biases the positioning pin from the housing position toward the protruding position. When the clamping device is positioned at the fixed position of the flare forming apparatus, the positioning pin may be switched from the housing position toward the protruding position by the biasing of the biasing member and fitted into the first fitting hole. The clamping device may be fixed at the fixed position by the positioning pin fitted into the first fitting hole. According to this embodiment, by utilizing the biasing force of the biasing member, the positioning pin can be fitted into the first fitting hole without manually switching the position of the positioning pin. Furthermore, the positioning pin can be held in the protruding position by the biasing member. Therefore, the clamping device can be fixed to the fixed position of the flare forming device simply by the operation of placing the clamping device at the fixed position of the flare forming device.

[0014] In addition to the above embodiments, or in place of the above embodiments, an operating unit may be provided, which is connected to the positioning pin and configured to move the positioning pin to switch between the protruding position and the retracted position. According to this embodiment, the positioning pin can be switched between the protruding position and the retracted position by a simple method of operating the control unit, and the clamping device can be suitably attached to and detached from the flare forming device.

[0015] In addition to or in lieu of the above embodiments, the operating mechanism may include a first link rotatably connected to the first main body, a second link rotatably connected to the second main body, and a second connecting portion rotatably connecting the first link and the second link. The power assist mechanism may be a toggle mechanism including the first connecting portion, the first link, the second link, and the second connecting portion. According to this embodiment, by utilizing a toggle mechanism, a pipe can be held with great force by operating the mechanism with simple and small force.

[0016] In addition to or in lieu of the above embodiments, at least one of the first main body portion and the second main body portion may have a linearly extending groove. The groove may be configured to engage with a guide rail provided on the flare forming apparatus. According to this embodiment, the clamping device can be attached to the flare forming device by a simple method of engagement between the groove and the guide rail.

[0017] In addition to or in lieu of the above embodiments, the first main body may have the groove. The positioning pin may be provided in the groove of the first main body. The positioning pin may be configured to fit into the first fitting hole formed in the guide rail of the flare forming apparatus. According to this embodiment, by engaging the groove portion of the first main body with the guide rail of the flare forming device, positioning can be completed together with the engagement of the clamping device with the flare forming device. Therefore, a clamping device that is convenient to attach to the flare forming device can be provided.

[0018] In addition to or in lieu of the above embodiment, the positioning pin may be configured to be switchable between the protruding position and the retracted position by moving within the first main body in a direction intersecting the extending direction of the groove. According to this embodiment, the engagement between the clamping device and the flaring device is less likely to be released, and the clamping device can be firmly held in place by the flaring device.

[0019] A. First Embodiment: A flaring tool 10 according to a first embodiment of the present disclosure will now be described. As shown in Figure 1, the flaring tool 10 is a power tool used to expand the end of a pipe into a conical shape in order to enable precise connection of metal (typically copper) pipes (tubes) for refrigerants.

[0020] A1. Configuration of the flaring tool 10: As shown in Figure 1, the flaring tool 10 comprises a tool housing 11 and a flaring device 30 including a clamping device 80. The outer casing of the flaring tool 10 is formed by the tool housing 11 and a handle portion 15.

[0021] As shown in Figure 2, the tool housing 11 extends along the drive shaft DX of the flare forming apparatus 30. The tool housing 11 houses an electric motor 21, a reduction mechanism 23 operably connected to the motor 21, and a flare forming apparatus 30 operably connected to the reduction mechanism 23. An opening 111 is formed at one end of the tool housing 11. A clamp mounting portion 60 provided at the tip of the flare forming apparatus 30 protrudes outward from the opening 111. A clamping device 80 for clamping pipes is attached to the clamp mounting portion 60.

[0022] The handle portion 15 protrudes from the tool housing 11 in a direction intersecting (more specifically, substantially perpendicular to) the drive shaft DX. The handle portion 15 includes a gripping portion 150 configured to be gripped by the user. The gripping portion 150 extends in a direction intersecting (more specifically, substantially perpendicular to) the drive shaft DX. The gripping portion 150 has a trigger 151 configured to be pressed by the user.

[0023] The handle portion 15 houses a switch 153 and a controller 20. The switch 153 is housed in the upper part of the handle portion 15. The switch 153 is normally off and is configured to be turned on in response to the pressing of the trigger 151. The controller 20 is a control device configured to control the operation of the flaring tool 10.

[0024] A battery mounting section 17 is provided at the free end of the handle section 15. The flaring tool 10 operates on power supplied from a battery 19 that is detachably mounted in the battery mounting section 17. However, the flaring tool 10 may also be configured to operate on power supplied from an external AC power source via a power cord.

[0025] After the clamping device 80, with the pipe clamped, is attached to the clamp mounting section 60 of the flare forming device 30, the controller 20 drives the motor 21 when the switch 153 is turned on in response to the user pressing the trigger 151. The motor 21 drives the flare forming device 30 via the reduction mechanism 23, forming a flare (a cone-shaped expansion) at the end of the pipe. Hereafter, the process of forming a flare will also be simply referred to as the flaring process.

[0026] For the sake of explanation, in the following, the direction of extension of the drive shaft DX is defined as the front-rear direction of the flare forming tool 10, the flare forming device 30, and the clamping device 80. In the front-rear direction, the side where the tip of the flare forming device 30 (clamp mounting portion 60) is located is defined as the front side, and the opposite side is defined as the rear side. Furthermore, the direction perpendicular to the drive shaft DX and corresponding to the long axis direction of the gripping portion 150 is defined as the up-down direction of the flare forming tool 10 and the flare forming device 30. In the up-down direction, the side where the free end of the handle portion 15 is located is defined as the lower side, and the opposite side is defined as the upper side. Furthermore, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction of the flare forming tool 10 and the flare forming device 30. Unless otherwise specified, the direction of the clamping device 80 refers to the direction of the clamping device 80 when it is mounted on the flare forming device 30 at the first rotation angle described later.

[0027] As shown in Figure 1, in this embodiment, the tool housing 11 is integrally formed with the handle portion 15. More specifically, the tool housing 11 is formed by connecting and fixing two halves (left shell and right shell), which include the portion forming the tool housing 11 and the portion forming the handle portion 15, to each other in the left-right direction. However, the tool housing 11 and the handle portion 15 may be formed separately and then connected and fixed to each other.

[0028] As shown in Figure 2, the motor 21 is housed in the front half of the lower part of the tool housing 11. The rotation axis of the output shaft 212 of the motor 21 extends below the drive shaft DX and parallel to the drive shaft DX. The motor 21 is electrically connected to and controlled by the controller 20.

[0029] The reduction gear 23 is housed behind the motor 21 in the rear half of the lower part of the tool housing 11. The reduction gear 23 is, for example, a gear reduction mechanism including multiple gears. The reduction gear 23 is operably connected to the output shaft 212 of the motor 21 and the main shaft 5 of the flare forming device 30, which will be described later. The reduction gear 23 is configured to reduce the rotational speed of the output shaft 212 of the motor 21 and output it to the flare forming device 30. The output gear 233 of the reduction gear 23 is operably connected to the flare forming device 30. The rotational speed of the output shaft 212 of the motor 21 is reduced by planetary gears and further reduced by helical gears. After the rotational speed of the output shaft 212 is reduced by the helical gears, it is output to the flare forming device 30 via the output gear 233.

[0030] The controller 20 is housed in the lower part of the handle 15. The controller 20 includes at least one processor (e.g., CPU) or processing circuit and is electrically connected to the motor 21 and the switch 153. In this embodiment, the controller 20 rotates the motor 21 in the forward direction while the trigger 151 is pressed and the switch 153 is turned on. When the trigger 151 is released and the switch 153 is turned off, the controller 20 stops the rotation of the motor 21 and then rotates the motor 21 in the reverse direction.

[0031] A2. Configuration of the flare forming apparatus 30: As shown in Figure 2, the flare forming apparatus 30 is positioned above the motor 21 within the tool housing 11. As shown in Figure 3, the flare forming apparatus 30 includes a housing 46 which includes a main housing 40 and a clamp mounting portion 60, a transmission shaft 43, a main shaft 5, a cone 57, and a clutch mechanism 7. The transmission shaft 43, main shaft 5, cone 57, and clutch mechanism 7 are housed in the main housing 40. In this embodiment, the flare forming apparatus 30 is configured as a single assembly in which these elements are connected to one another.

[0032] The main housing 40 has a substantially cylindrical shape. The main housing 40 is positioned to extend in the front-rear direction along the drive shaft DX. The main housing 40 is held within the tool housing 11 in a predetermined position relative to the tool housing 11.

[0033] As shown in Figure 2, the front end of the main housing 40 protrudes forward of the tool housing 11 through the opening 111 of the tool housing 11. The front end of the main housing 40 is configured as a clamp mounting portion 60.

[0034] The transmission shaft 43 is operably connected to the output gear 233 of the reduction mechanism 23 and is configured to transmit the rotation of the output gear 233 to the main shaft 5. More specifically, the transmission shaft 43 is supported in the main housing 40 so as to be rotatable around the drive shaft DX by two bearings 431 and 432 located within the rear end of the main housing 40. As shown in Figure 2, the rear end of the transmission shaft 43 is coaxially connected to the output gear 233, and the transmission shaft 43 rotates integrally with the output gear 233 as the motor 21 is driven.

[0035] As shown in Figure 3, the main shaft 5 is a long member that defines the drive shaft DX. The main shaft 5 is sometimes also called a spindle. The main shaft 5 is movable in the front-rear direction along the drive shaft DX while rotating around the drive shaft DX within the main housing 40. The front end 52 of the main shaft 5 rotatably supports a cone 57 for forming a flare. As the main shaft 5 moves forward, the cone 57 protrudes forward from the opening 62 of the clamp mounting portion 60 at the front end of the main housing 40.

[0036] The main shaft 5 includes a cylindrical sliding portion 51 and a shaft portion 55 extending rearward from the rear end of the sliding portion 51.

[0037] The slide portion 51 constitutes the front half of the main shaft 5. The front end portion 52 of the slide portion 51 rotatably supports the cone 57. The front end portion 52 is supported by a bearing 510 so as to be rotatable around the drive shaft DX and slidable in the front-rear direction. The rear end portion 53 of the slide portion 51 is slidable along the inner surface of the first sleeve 711 of the fixed sleeves 71 arranged inside the main housing 40.

[0038] The shaft portion 55 constitutes the rear half of the main shaft 5. The shaft portion 55 extends rearward from the center of the slide portion 51. The shaft portion 55 is hollow and has a connecting hole 551 with a polygonal cross-section. The front half of the transmission shaft 43 is inserted into the connecting hole 551. With this configuration, the main shaft 5 is rotatable integrally with the transmission shaft 43 and is slidable in the front-rear direction relative to the transmission shaft 43. The rear end of the shaft portion 55 is configured as a male threaded portion 56. The male threaded portion 56 can be screwed into the female threaded portion 737 of the movable flange 73 of the clutch mechanism 7.

[0039] As shown in Figure 3, the cone 57 includes a conical portion 571 and a cylindrical shaft portion 573. The shaft portion 573 is fitted into a radial bearing 581 within a support hole 521 at the front end portion 52. In this way, the cone 57 is supported on the front end portion 52 of the main shaft 5 so as to be rotatable around the axis AX. In this embodiment, the top of the cone 57 is always positioned on the drive shaft DX. This allows for the formation of a flare at the end of a narrower pipe than if the top of the cone 57 were offset from the drive shaft DX.

[0040] As shown in Figure 3, the clutch mechanism 7 includes a fixed sleeve 71, a movable flange 73, a compression spring 75, and a rotation stopper 77.

[0041] The fixed sleeve 71 is fitted into the front half of the main housing 40 and is held in a substantially immovable position relative to the main housing 40. In this embodiment, the fixed sleeve 71 is a single cylindrical body formed by connecting a first sleeve 711 and a second sleeve 715 to each other in the front-rear direction.

[0042] The first sleeve 711 occupies most of the fixed sleeve 71. The rear end 53 of the sliding portion 51 of the main shaft 5 is slidably positioned within the first sleeve 711. The second sleeve 715 is cylindrical and shorter than the first sleeve 711 in the front-rear direction, and has substantially the same inner and outer diameters as the first sleeve 711.

[0043] The movable flange 73 is a cylindrical member with a flange (flange sleeve). The movable flange 73 is located behind the second sleeve 715 of the fixed sleeve 71 and around the shaft portion 55 of the main shaft 5.

[0044] Inside the shaft portion 55, a female threaded portion 737 is formed that can be screwed into the male threaded portion 56 of the main shaft 5. The male threaded portion 56 of the main shaft 5 and the female threaded portion 737 of the movable flange 73 constitute a feed screw mechanism 6 that moves the main shaft 5 and the movable flange 73 relative to each other in the front-rear direction. The male threaded portion 56 corresponds to the screw shaft of the feed screw mechanism 6, and the female threaded portion 737 corresponds to the nut. The feed screw mechanism 6 may also be configured as a ball screw mechanism. In this case, multiple balls are arranged to roll within a track defined by a helical groove formed on the outer circumference of the main shaft 5 and a helical groove formed on the inner circumference of the movable flange 73, and the main shaft 5 and the movable flange 73 engage with each other via the balls.

[0045] As shown in Figure 3, an auxiliary spring 44 is positioned between the rear end of the main shaft 5 and the bearing 431 within the rear end of the main housing 40. The auxiliary spring 44 in this embodiment is a compression coil spring and is positioned around the transmission shaft 43. The auxiliary spring 44 biases the main shaft 5 forward relative to the main housing 40. The auxiliary spring 44 holds the male threaded portion 56 in a position where it can be screwed into the female threaded portion 737 when the male threaded portion 56 disengages from the female threaded portion 737 due to the rearward movement of the main shaft 5. The biasing force (load) of the auxiliary spring 44 is set to be significantly weaker than that of the compression spring 75.

[0046] As shown in Figure 3, the compression spring 75 is a metal compression coil spring located behind the movable flange 73. The rear end of the compression spring 75 abuts against the shoulder portion 407 of the main housing 40. The compression spring 75 biases the movable flange 73 forward toward the fixed sleeve 71, pressing the clutch pin 734 against the second sleeve 715. As a result, the movable flange 73 is integrated with the fixed sleeve 71 in a manner that makes it substantially immobile. Hereafter, the front-rear position of the movable flange 73 relative to the fixed sleeve 71 at this time will also be referred to as the connection position.

[0047] Instead of a metal compression coil spring, a disc spring or a urethane spring may be used for the compression spring 75. When a urethane spring is used, for example, a cylindrical urethane rubber may be arranged to surround the shaft portion 55, or multiple columnar urethane rubber may be arranged around the shaft portion 55. Urethane springs have a higher spring constant compared to metal coil springs. Therefore, by using a urethane spring for the compression spring 75, the length of the compression spring 75 in the front-rear direction can be shortened compared to when a metal coil spring is used. Consequently, the length of the flare forming apparatus 30 and the flare forming tool 10 in the front-rear direction can be shortened.

[0048] The movable flange 73 is movable backward relative to the fixed sleeve 71 from the connection position to a position where the clutch pin 734 is separated from the second sleeve 715 (hereinafter also referred to as the disengagement position). When the movable flange 73 is positioned in the disengagement position, the movable flange 73 becomes rotatable relative to the fixed sleeve 71 together with the main shaft 5.

[0049] As shown in Figure 3, in the front-rear direction, a part of the rotation stopper 77, a thrust bearing 781, and a washer 785 are interposed between the movable flange 73 and the front end of the compression spring 75. The front end of the compression spring 75 is in contact with the washer 785. The compression spring 75 biases the movable flange 73 forward via these components.

[0050] The rotation stopper 77 rotates integrally with the movable flange 73 around the drive shaft DX. The rotation stopper 77 and the movable flange 73 are permitted to rotate clockwise when viewed from the rear, and are restricted from rotating counterclockwise when viewed from the rear, relative to the main housing 40 and the fixed sleeve 71. The compression spring 75 is isolated from the rotation of these components by a thrust bearing 781.

[0051] A3. Operation of the flare forming device 30 when the motor 21 is driven: As shown in Figure 3, in the flare forming apparatus 30, the male threaded portion 56 of the main shaft 5 is positioned to be screwable with the female threaded portion 737 of the movable flange 73 (hereinafter referred to as the initial position). At this time, the movable flange 73 is in the connection position and is substantially immovable relative to the fixed sleeve 71 and the main housing 40. The controller 20 starts the motor 21 to rotate in the forward direction in response to the switch 153 being turned on. When the motor 21 rotates in the forward direction, the main shaft 5 rotates clockwise when viewed from the rear, around the drive shaft DX. The main shaft 5 is fed forward by the feed screw mechanism 6. Hereinafter, rotation in the clockwise direction when viewed from the rear will also be referred to as forward rotation, and rotation in the counterclockwise direction when viewed from the rear will also be referred to as reverse rotation.

[0052] As shown in Figure 3, when the pipe P is clamped to the clamping device 80 attached to the clamp mounting section 60, if the main shaft 5 continues to rotate in the forward direction, the cone 57 will come into contact with the end of the pipe P before the main shaft 5 reaches its furthest forward position. As the main shaft 5 rotates while moving forward, the cone 57 rotates around the axis AX and orbits the drive shaft DX, thereby expanding the end of the pipe P into a cone shape. Once the cone 57 has expanded the end of the pipe P into a cone shape and moved forward to a certain extent while forming a flare, the pipe P held by the clamping device 80 will prevent the cone 57, and consequently the main shaft 5, from moving forward before the main shaft 5 reaches its furthest forward position. The position of the main shaft 5 at this time will hereafter be referred to as the forward obstruction position.

[0053] When the main shaft 5 continues to rotate in the forward-blocking position, the movable flange 73 moves backward relative to the fixed sleeve 71 against the biasing force of the compression spring 75 due to the action of the feed screw mechanism 6. As a result, the clutch pin 734 separates from the second sleeve 715 and moves to a disengaged position where it can rotate relative to the fixed sleeve 71. Hereafter, the movement of the movable flange 73 from the engaged position to the disengaged position will also be referred to as the operation of the clutch mechanism 7. Note that since the flare shape has already been formed when the main shaft 5 can no longer move forward, it can also be said that the clutch mechanism 7 operates in accordance with the formation of the flare.

[0054] As the movable flange 73 moves backward, the compression spring 75 is compressed, and the biasing force of the compression spring 75 increases. When the movable flange 73 reaches the blocking position, it does not move any further and begins to rotate forward integrally with the main shaft 5, which is in the forward obstruction position.

[0055] The biasing force of the compression spring 75 acts on the main shaft 5 via the movable flange 73. The cone 57, supported at the front end 52 of the main shaft 5, receives this biasing force and rotates around the shaft AX while circling the drive shaft DX, pressing the flare at substantially the same position in the front-rear direction. Hereinafter, this movement of the cone 57 will also be referred to as the finishing movement.

[0056] In this embodiment, when the user releases the pressure on the trigger 151 and the switch 153 is turned off, the controller 20 stops the motor 21 and then rotates it in the reverse direction. When the motor 21 is rotated in the reverse direction while the movable flange 73 is in the disconnected position, the main shaft 5 is reversed. Consequently, the main shaft 5 is moved backward by the lead screw mechanism 6. The movable flange 73 moves forward due to the biasing force of the compression spring 75 and returns to the connected position.

[0057] If the main shaft 5 continues to rotate in the reverse direction, it will move backward in the reverse direction until the male threaded portion 56 disengages from the female threaded portion 737, returning to the initial position shown in Figure 2. The controller 20 stops the motor 21 from rotating in the reverse direction as the main shaft 5 returns to its initial position.

[0058] A4. Clamping device configuration: As shown in Figure 3, the clamping device 80 can clamp (hold) the pipe P in the clamping hole 82. The clamping device 80, with the pipe P clamped, can be fixed to the clamping mounting portion 60 provided at the front end of the flare forming device 30. The flare forming device 30 can form a flare on the pipe P clamped by the clamping device 80.

[0059] As shown in Figure 4, the clamping device 80 comprises a main body 800 including a first main body 81 and a second main body 83, a first connecting part 841, and an operating mechanism 84. The main body 800 is formed using a material having a higher hardness than the pipe P, such as iron or aluminum.

[0060] The first main body portion 81 has a substantially rectangular parallelepiped shape. The first main body portion 81 has a front portion 81F which is the front side of the first main body portion 81 when the clamping device 80 is attached to the flare forming device 30, a back portion 81B (see Figure 5) on the opposite side of the front portion 81F, and four side portions connecting the front portion 81F and the back portion 81B. The back portion 81B faces the cone 57 when the clamping device 80 is attached to the flare forming device 30. The four side portions include a first opposing portion 81S which faces the second main body portion 83, a first side portion 81T which is on the opposite side of the first opposing portion 81S, a left side portion 81L which is one of the two side portions that connect the first side portion 81T and the first opposing portion 81S and has a first connecting portion 841, and a right side portion 81R which is on the opposite side of the left side portion 81L. A roughly semicircular first recess 811 is formed in the first opposing portion 81S.

[0061] The second main body portion 83 has a substantially rectangular parallelepiped shape that is mirror-symmetric to the first main body portion 81. Specifically, the second main body portion 83 has a front portion 83F which is the front side of the second main body portion 83 when the clamping device 80 is attached to the flare forming device 30, a back portion 83B (see Figure 5) on the opposite side of the front portion 83F, and four side portions connecting the front portion 83F and the back portion 83B. The back portion 83B faces the cone 57 when the clamping device 80 is attached to the flare forming device 30. The four side portions include a second opposing portion 83S which faces the first main body portion 81, a second side portion 83T which is on the opposite side of the second opposing portion 83S, a left side portion 83L which is one of the two side portions that connect the second side portion 83T and the second opposing portion 83S and has a first connecting portion 841, and a right side portion 83R which is on the opposite side of the left side portion 83L. A roughly semicircular second recess 832 is formed in the second opposing portion 83S.

[0062] The first connecting portion 841 is provided at the left end of the main body portion 800 and connects the left side portion 81L of the first main body portion 81 to the left side portion 83L of the second main body portion 83. The first connecting portion 841 connects the first main body portion 81 and the second main body portion 83 so that they can rotate relative to each other. Therefore, the main body portion 800 can be switched between a state in which the first main body portion 81 and the second main body portion 83 are close together and a state in which the first main body portion 81 and the second main body portion 83 are separated by the rotation of the first main body portion 81 and the second main body portion 83.

[0063] Figures 4 and 5 show a state in which the first main body portion 81 and the second main body portion 83 are in close proximity. In this state, the first opposing portion 81S and the second opposing portion 83S are facing each other. Hereafter, this positional relationship between the first main body portion 81 and the second main body portion 83 will also be referred to as the "closed position". In the closed position, one clamp hole 82 is formed in the main body portion 800 by the first recess 811 and the second recess 832. Note that the "state in which the first main body portion 81 and the second main body portion 83 are in close proximity" means a state in which the main body portion 800 can hold the pipe P, regardless of whether the first opposing portion 81S of the first main body portion 81 and the second opposing portion 83S of the second main body portion 83 are in contact or not, and means a state in which the clamp hole 82 is substantially formed in the main body portion 800.

[0064] The clamp hole 82 penetrates the main body 800 from the rear to the front along the drive shaft DX. In this embodiment, as shown in Figures 5 and 6, a tapered portion 82T is formed around the clamp hole 82 at the rear end of the main body 800, with the diameter increasing towards the rear. The tapered portion 82T has a shape corresponding to a flare shape. The main body 800 of the clamping device 80 has one clamp hole 82 with a diameter corresponding to a predetermined pipe diameter. Therefore, when processing pipes of different diameters, a clamping device 80 with clamp holes 82 of different diameters corresponding to the different pipe diameters is used.

[0065] The clamp hole 82 is set to be slightly smaller than the outer diameter of the pipe P, and the clamping device 80 holds the pipe P in the clamp hole 82 by utilizing the reaction force from the pipe P. Therefore, when the pipe P is held by the first main body portion 81 and the second main body portion 83, the first opposing portion 81S and the second opposing portion 83S may be slightly separated. Note that this state is included in the "state in which the first main body portion 81 and the second main body portion 83 are in close proximity".

[0066] When the first main body portion 81 is rotated relative to the second main body portion 83 around the first connecting portion 841, the position is switched from the closed position to a state in which the first opposing portion 81S and the second opposing portion 83S are separated. This state is also called the "open position". In the open position, the pipe P is not held by the first recess 811 and the second recess 832. The pipe P is attached to and detached from the clamping device 80 with the first main body portion 81 and the second main body portion 83 in the open position.

[0067] As shown in Figure 7, in this embodiment, the first opposing portion 81S of the first main body portion 81 is provided with a fixing pin 89 that protrudes outward from the first opposing portion 81S. Furthermore, a fitting hole 834 is formed in the second opposing portion 83S of the second main body portion 83. The fitting hole 834 can accommodate the fixing pin 89 when the first main body portion 81 and the second main body portion 83 are in the closed position. The first recess 811 of the first main body portion 81 and the second recess 832 of the second main body portion 83 can be aligned by the simple method of fitting the fixing pin 89 into the fitting hole 834. This also suppresses or prevents misalignment between the first main body portion 81 and the second main body portion 83 during flaring, thereby improving the processing accuracy of the pipe P. Note that the fixing pin 89 may be provided in the second main body portion 83 instead of the first main body portion 81.

[0068] As shown in Figure 5, a stopper 86 is provided on the rear side of the clamping device 80. The stopper 86 is connected, for example, to the first connecting portion 841 and is rotatably connected to the second main body portion 83 with respect to the first connecting portion 841. The tip 86T of the stopper 86 is normally positioned to block a portion of the clamping hole 82. Therefore, when positioning the pipe P between the first recess 811 of the first main body portion 81 and the second recess 832 of the second main body portion 83, the tip of the pipe P can be brought into contact with the stopper 86. This allows the stopper 86 to position the pipe P in the front-rear direction relative to the clamping device 80. Furthermore, when the pipe P is held in the clamping hole 82, it is possible to suppress or prevent the tip of the pipe P from protruding from the clamping hole 82.

[0069] Furthermore, the tip 86T of the stopper 86 is positioned so as to overlap with the clamp hole 82 when the clamping device 80 is viewed from the front along the drive shaft DX, and is also positioned away from the drive shaft DX. With this configuration, when the cone 57 approaches from the back of the main body 800 during flaring, the tip 86T is pushed away from the drive shaft DX by the conical portion 571 of the cone 57. In this way, the stopper 86 is configured not to obstruct the movement of the cone 57 in the front-rear direction.

[0070] The operating mechanism 84 is a mechanism for opening and closing the first main body portion 81 and the second main body portion 83 of the main body portion 800. The operating mechanism 84 can switch the arrangement of the first main body portion 81 and the second main body portion 83 between a closed position and an open position by utilizing a force-multiplier mechanism. A force-multiplier mechanism is a mechanism that opens and closes the main body portion 800 by utilizing the balance of moments. The clamping device 80 is configured such that the force required to operate the operating mechanism 84 is reduced while the holding force of the pipe P by the first main body portion 81 and the second main body portion 83 is increased by utilizing the force-multiplier mechanism. In this embodiment, the force-multiplier mechanism is composed of a toggle mechanism including a first connecting portion 841, a first link 846, a second link 848, and a second connecting portion 842.

[0071] As shown in Figures 5 and 6, the first link 846 is rotatably connected to the second link 848 via the second connecting portion 842. The first link 846 is also rotatably connected to the first main body portion 81 via the third connecting portion 843. The third connecting portion 843 is provided on the right side 81R of the first main body portion 81, opposite the first connecting portion 841 across the clamp hole 82. The first link 846 has a roughly rectangular prism shape that extends along the straight line connecting the second connecting portion 842 and the third connecting portion 843. The first link 846 is connected to the lever 845.

[0072] As shown in Figures 4 and 6, the second link 848 is rotatably connected to the second main body 83 via the fourth connecting portion 844. The second link 848 is also rotatably connected to the first link 846 via the second connecting portion 842. The fourth connecting portion 844 is provided on the right side 83R of the second main body 83, opposite to the first connecting portion 841, across the clamp hole 82. The second link 848 has a roughly rectangular prism shape that extends along the straight line connecting the second connecting portion 842 and the fourth connecting portion 844.

[0073] As shown in Figure 5, the lever 845 is used to open and close the main body 800 by the operating mechanism 84. In this embodiment, the first link 846 and the lever 845 are formed from a single part by integral molding. The extending direction of the lever 845 is substantially perpendicular to the extending direction of the first link 846, and the lever 845 is configured to bend toward the first side portion 81T of the first main body 81. By configuring it in this way, the lever 845 and the first link 846 can be arranged along the outer shape of the first main body 81. Therefore, the clamping device 80 can be miniaturized when the first main body 81 and the second main body 83 are in the closed position. In this embodiment, the first link 846 and the lever 845 may be formed by connecting separate parts with different components.

[0074] As shown in Figure 5, in the clamping device 80 of this embodiment, the first connecting portion 841 and the fourth connecting portion 844 are composed of a fixed four-bar link. The third connecting portion 843 is configured to operate in response to input from the second connecting portion 842 via the lever 845. When the first main body portion 81 and the second main body portion 83 are in the closed position, the third connecting portion 843 is positioned outside the straight line LL connecting the second connecting portion 842 and the fourth connecting portion 844, and the clamping device 80 is locked.

[0075] As shown in Figure 7, when the lever 845 is rotated in the direction R1 away from the first main body 81, with the third connecting portion 843 as the center, the lock of the clamping device 80 is released, and the first main body 81 and the second main body 83 are switched to the open position. In this way, by utilizing the force-multiplying mechanism, the clamping device 80 can operate the lever 845 with a relatively small force and hold the pipe P in the clamping hole 82 with a force greater than the force required to operate the lever 845. Therefore, the pipe can be firmly held by the simple method of operating the lever 845. Consequently, it is possible to suppress or prevent the position of the pipe P from shifting after it has been held in the clamping hole 82 of the clamping device 80.

[0076] A5. Engagement mechanism between the clamping device 80 and the clamping mounting portion 60: As shown in Figure 3, the clamping device 80 is configured to engage with the clamping mounting portion 60 by sliding it in a direction perpendicular to the drive shaft DX relative to the clamping mounting portion 60 (the left-right direction in the example of Figure 3). The mounting mechanism between the clamping device 80 and the clamping mounting portion 60 includes a pair of guide rails 66 formed in the clamping mounting portion 60 and a first groove 816 and a second groove 836 formed in the clamping device 80.

[0077] As shown in Figure 3, the pair of guide rails 66 are arranged one at a time, facing each other with the drive shaft DX in between. The pair of guide rails 66 are projections that extend radially outward from the radially outward direction to the radially inward direction, centered on the drive shaft DX. Furthermore, the pair of guide rails 66 extend in a direction perpendicular to the drive shaft DX (in the example in Figure 3, the left-right direction).

[0078] As shown in Figure 8, the first groove 816 is a recess extending linearly in the first side portion 81T of the first main body portion 81. The extension direction D1 of the first groove 816 is in a direction intersecting the drive shaft DX (more specifically, a substantially orthogonal direction). Note that in Figure 8, the lever 845 is omitted from the illustration for ease of understanding the technology.

[0079] As shown in Figure 9, the second groove 836 is a recess that extends linearly in the second side portion 83T of the second main body portion 83. The second groove 836 is configured in the same way as the first groove 816. That is, the direction of extension of the second groove 836 is in a direction intersecting the drive shaft DX (more specifically, a substantially orthogonal direction), and is approximately parallel to the direction of extension D1 of the first groove 816.

[0080] The first groove 816 and the second groove 836 are provided so as to face each other with the clamp hole 82 in between. That is, the first groove 816 and the second groove 836 are arranged parallel to each other and facing each other. The extending direction D1 of the first groove 816 and the second groove 836 defines the insertion direction of the clamping device 80 into the clamp mounting portion 60. In the following description, for the sake of explanation, the extending direction D1 may also be referred to as the insertion direction D1.

[0081] As shown in Figure 10, the clamping device 80 can be engaged with the clamping device 80 by sliding the first groove 816 and the second groove 836 toward the pair of guide rails 66 of the clamping device 60 along the extending direction D1 of the first groove 816 and the second groove 836. Therefore, the clamping device 80 can be attached to the clamping device 60 by the simple method of sliding the clamping device 80.

[0082] The pair of guide rails 66 of the clamp mounting portion 60 engage with the first groove 816 and the second groove 836 provided on the sides of the clamping device 80 (specifically, the first side portion 81T of the first main body portion 81 and the second side portion 83T of the second main body portion 83). In other words, the clamping device 80 can be attached to the clamp mounting portion 60 without extending the clamp mounting portion 60 to the front of the clamping device 80. Therefore, the length of the clamp mounting portion 60 in the front-rear direction can be shortened. Consequently, the length LA of the flare forming tool 10 shown in Figure 2, and the length of the flare forming device 30 in the front-rear direction can be shortened.

[0083] As shown in Figure 9, the first groove 816 is formed in the first side portion 81T, extending from the right side portion 81R to the left side portion 81L of the first main body portion 81. Similarly, the second groove 836 is formed in the second side portion 83T, extending from the right side portion 83R to the left side portion 83L of the second main body portion 83. In other words, both ends of the first groove 816 and the second groove 836 are open. With this configuration, the clamping device 80 can be engaged with the pair of guide rails 66 from either side in the extending direction D1.

[0084] As shown in Figure 10, the pair of guide rails 66 are arranged one by one, facing each other with the drive shaft DX in between. The configuration of each of the pair of guide rails 66 is substantially the same. Therefore, the first groove 816 can engage with either of the pair of guide rails 66, and the same applies to the second groove 836. Consequently, even if the positional relationship between the first body part 81 and the second body part 83 is reversed, they can still be engaged with the clamp mounting part 60.

[0085] Furthermore, as shown in Figure 6, none of the components of the clamping device 80 are positioned around the first groove 816 and the second groove 836 of the clamping device 80. Specifically, the first connecting portion 841, the second connecting portion 842, the third connecting portion 843, the fourth connecting portion 844, and the lever 845 are not positioned above the first groove 816 or on both sides of the first groove 816, nor below the second groove 836 or on both sides of the second groove 836.

[0086] More specifically, the first connecting portion 841, the third connecting portion 843, and the fourth connecting portion 844 are positioned vertically between the first groove portion 816 and the second groove portion 836, and are set back from both the left and right sides of the first groove portion 816 and the second groove portion 836. In addition, the second connecting portion 842 and the lever 845 are offset in the front-rear direction to the front of the first groove portion 816 and the second groove portion 836, and are set back from directly above the first groove portion 816 and directly below the second groove portion 836. With this configuration, it is possible to prevent the first connecting portion 841, the second connecting portion 842, the third connecting portion 843, the fourth connecting portion 844, and the lever 845 from interfering with the pair of guide rails 66 when the first groove portion 816 and the second groove portion 836 are engaged with the pair of guide rails 66.

[0087] A6. Fixing mechanism between the clamping device 80 and the clamping mounting part 60: Next, the mechanism for fixing the clamping device 80 to the clamping mounting portion 60 will be described. As shown in Figures 8 and 9, a positioning pin 88 is provided in the first groove portion 816. In this embodiment, as shown in Figure 10, the positioning pin 88 fits into the fitting hole 664 of the clamping mounting portion 60, thereby fixing the clamping device 80 engaged with the clamping mounting portion 60 to a predetermined position on the clamping mounting portion 60. In the following description, the position where the clamping device 80 is attached to and fixed on the clamping mounting portion 60 will also be referred to as the "fixing position".

[0088] As shown in Figure 9, the positioning pin 88 is a long, axial member. The positioning pin 88 is positioned inside the first main body 81 such that its long axis direction intersects (more specifically, substantially perpendicular to) the extending direction D1 of the first groove 816. In the example in Figure 9, the long axis direction of the positioning pin 88 is perpendicular to the extending direction D1 and the drive shaft DX, and parallel to the vertical direction. In this embodiment, after the positioning pin 88 is inserted into the first main body 81, it is covered by the cover 886 with its tip 88T protruding from the opening of the cover 886. The cover 886 is integrated with the first main body 81 by screwing it in. The movement of the positioning pin 88 in the long axis direction is restricted by contact with the cover 886.

[0089] The positioning pin 88 is positioned within the first main body 81 so as to be movable along the long axis. Specifically, by moving along the long axis, the positioning pin 88 can be switched between a protruding position in which the tip 88T of the positioning pin 88 protrudes outward from the first main body 81 (more specifically, the first groove 816) and a retracted position in which the tip 88T is housed within the first main body 81. When positioned in the protruding position, the positioning pin 88 can engage with the fitting hole 664 formed in the guide rail 66.

[0090] A biasing member 882 is positioned around the positioning pin 88. The biasing member 882 is a compression coil spring and biases the positioning pin 88 outward from the first main body portion 81 along the longitudinal axis. The positioning pin 88's movement in the longitudinal axis direction is restricted by the cover portion 886, and under normal circumstances, it is positioned in a protruding position due to the biasing force of the biasing member 882.

[0091] The positioning pin 88 moves to the housing position as it receives a pressing force from the flare forming device 30 (in this embodiment, the guide rail 66 of the clamp mounting portion 60) that resists the biasing force of the biasing member 882 while the clamp device 80, which is engaged with the clamp mounting portion 60, moves to the fixed position. When the clamp device 80 is positioned in the fixed position of the flare forming device 30, the biasing member 882 is released from the pressing force from the flare forming device 30. The positioning pin 88 is switched from the housing position to the protruding position by the biasing force of the biasing member 882 and fits into the flare forming device 30 (in this embodiment, the fitting hole 664). The clamp device 80 is fixed in the fixed position by the positioning pin 88 fitted into the flare forming device 30.

[0092] In this embodiment, the positioning pin 88 has a pair of flange portions 884. The pair of flange portions 884 are larger in diameter than the rest of the positioning pin 88. The pair of flange portions 884 are arranged to face each other on the long axis of the positioning pin 88. A connecting portion 872 of the operating portion 87 (see Figure 4) is located between the pair of flange portions 884.

[0093] The connecting portion 872 is connected to the positioning pin 88 between a pair of flange portions 884. When the operating portion 87 is moved vertically, the connecting portion 872 biases the pair of flange portions 884, and the positioning pin 88 moves vertically. In other words, the position of the positioning pin 88 can be switched between a protruding position and a retracted position by operating the operating portion 87. In this embodiment, since a biasing member 882 is provided, the user can move the positioning pin 88 to the retracted position by manually moving the operating portion 87 against the biasing force of the biasing member 882.

[0094] In this embodiment, a fixing pin 89 is formed on the side opposite to the tip 88T of the positioning pin 88. In other words, the positioning pin 88 and the fixing pin 89 are configured to be integrated. This configuration reduces the number of parts in the clamping device 80 compared to the case where the positioning pin 88 and the fixing pin 89 are separate components.

[0095] As shown in Figure 10, the pair of guide rails 66 are provided in the clamp mounting portion 60 so as to face each other with the drive shaft DX in between. Each of the pair of guide rails 66 has a fitting hole 664 and a pressing portion 662 formed therein. Since the configuration of each of the pair of guide rails 66 is substantially the same, the configuration of the guide rail 66 positioned above the drive shaft DX will be described below.

[0096] The fitting hole 664 is configured to accept a positioning pin 88 positioned in a protruding position. The position of the fitting hole 664 relative to the drive shaft DX defines the fixed position of the clamping device 80 relative to the drive shaft DX. Specifically, the fitting hole 664 is positioned such that, with the positioning pin 88 fitted into the fitting hole 664, the center of the clamping hole 82 is positioned on the drive shaft DX. This configuration allows for easy alignment of the clamping hole 82 relative to the drive shaft DX when attaching the clamping device 80 to the clamping mounting portion 60. Note that the fitting hole 664 does not have to be a through hole; it may be a bottomed recess or the like.

[0097] As shown in Figure 10, the pressing portion 662 is configured to press the positioning pin 88 against the biasing force of the biasing member 882. Specifically, the pressing portion 662 has an inclined first portion 662E of the guide rail 66 and a second portion 662C of the guide rail 66 with substantially constant thickness. The second portion 662C has substantially the same thickness as the depth of the first groove 816 and the second groove 836. In the second portion 662C, the positioning pin 88 is restricted from moving outward (protruding) from the first groove 816 by the second portion 662C and is positioned in the housing position. The thickness of the first portion 662E is thinner than the thickness of the second portion 662C and is inclined to gradually increase as it approaches the second portion 662C.

[0098] The second section 662C is formed to be continuous with the fitting hole 664. That is, the pressing section 662 is provided continuously up to the fitting hole 664. The pressing section 662 utilizes the inclination of the guide rail 66 in the first section 662E to press the positioning pin 88 in the protruding position with gradually increasing force, causing the positioning pin 88 to advance from the protruding position towards the retracted position. As the clamping device 80 slides further along the guide rail 66 and the positioning pin 88 reaches the second section 662C, the positioning pin 88 is positioned in the retracted position. Once the positioning pin 88 is in the retracted position, it becomes movable back to the protruding position as the clamping device 80 slides further along the guide rail 66 and reaches the fitting hole 664.

[0099] In this embodiment, the first portion 662E of the pressing portion 662 is formed at the end of the guide rail 66. By being provided at the end of the guide rail 66, when the clamping device 80 (specifically, the first groove portion 816 and the second groove portion 836) is engaged with the guide rail 66, the positioning pin 88 at the protruding position is less likely to catch on the guide rail 66. Therefore, the clamping device 80 can be smoothly engaged with the clamp mounting portion 60. Furthermore, since the first portion 662E is formed at both ends of the guide rail 66, the clamping device 80 can be smoothly engaged with the clamp mounting portion 60 from either side.

[0100] As the clamping device 80 is engaged with the guide rail 66 along the insertion direction D1, the tip 88T of the positioning pin 88 contacts the first portion 662E of the pressing portion 662, as shown in Figure 11. As the clamping device 80 slides further along the guide rail 66, as shown in Figure 12, the pressing portion 662 gradually pushes the positioning pin 88 into its housing position against the biasing force of the biasing member 882.

[0101] As shown in Figure 13, when the clamping device 80 reaches a predetermined fixed position, the positioning pin 88 reaches the fitting hole 664. The positioning pin 88 is released from the pressure applied by the pressing portion 662 and moves to the protruding position due to the restoring force of the biasing member 882. As a result, the positioning pin 88 is fitted into the fitting hole 664, and the movement of the clamping device 80 along the insertion direction D1 relative to the clamp mounting portion 60 is restricted. In this embodiment, by utilizing the biasing member 882, the positioning pin 88 can be fitted into the fitting hole 664 without manually switching the positioning pin 88 between the protruding position and the retracted position.

[0102] As shown in Figure 14, when the positioning pin 88 is positioned in the protruding position and fitted into the fitting hole 664, the operating part 87 is positioned at the upper end of its movable range. To remove the clamp device 80 from the clamp mounting part 60, the operating part 87 is pushed downward by manual operation. As shown in Figure 15, when the operating part 87 is pushed downward, the positioning pin 88 moves from the protruding position to the retracted position. As a result, the fitting between the positioning pin 88 and the fitting hole 664 is released. The user can remove the clamp device 80 from the clamp mounting part 60 by sliding the clamp device 80 along the extending direction D1 of the first groove 816 while the operating part 87 is pushed downward.

[0103] As shown in Figures 14 and 15, the fixing pin 89 is positioned on the opposite side from the positioning pin 88. As described above, the fixing pin 89 protrudes from the first opposing portion 81S of the first main body portion 81 toward the second main body portion 83 and is fitted into the fitting hole 834 formed in the second main body portion 83. In this embodiment, even if the positioning pin 88 is switched between the protruding position and the retracted position by the operating unit 87, the tip 89T of the fixing pin 89 is configured to protrude from the first opposing portion 81S toward the second main body portion 83. That is, even if the position of the positioning pin 88 is switched between the protruding position and the retracted position, the engagement between the first main body portion 81 and the second main body portion 83 is not released.

[0104] Figure 16 shows a clamp mounting section 60 to which a clamp device 80 is attached, with the positional relationship between the first main body 81 and the second main body 83 reversed. Note that the orientation of the flare forming tool 10 remains unchanged. The clamp device 80 shown in Figure 16 is the same as the clamp device 80 shown in Figure 13, but inverted vertically. Specifically, the first main body 81 is positioned below the drive shaft DX, and the second main body 83 is positioned above the drive shaft DX.

[0105] As shown in Figure 9, the first groove 816 and the second groove 836 are arranged so as to be point-symmetric with respect to the drive shaft DX when the clamping device 80 is viewed from the front along the drive shaft DX. Specifically, when the clamping device 80 is viewed from the front, the first groove 816 and the second groove 836 are arranged parallel to and opposite each other, as described above. Furthermore, the first groove 816 and the second groove 836 are arranged such that the shortest distance L1 from the drive shaft DX to the first groove 816 is equal to the shortest distance L2 from the drive shaft DX to the second groove 836.

[0106] Furthermore, as shown in Figure 10, the pair of guide rails 66 of the clamp mounting portion 60 are configured to be point-symmetric with respect to the drive shaft DX when the clamp device 80 is viewed from the front along the drive shaft DX. Specifically, when the clamp mounting portion 60 is viewed from the front, the pair of guide rails 66 are arranged parallel to and opposite each other. The pair of guide rails 66 are arranged such that the shortest distance from the drive shaft DX to one guide rail 66 is equal to the shortest distance from the drive shaft DX to the other guide rail 66. The pressing portion 662 and the fitting hole 664 are provided on each of the pair of guide rails 66 in a positional relationship that is point-symmetric with respect to the drive shaft DX.

[0107] As described above, in the clamping device 80 of this embodiment, the first groove 816 and the second groove 836 and the pair of guide rails 66 are arranged so as to be point-symmetric with respect to the drive shaft DX. Therefore, as shown in Figure 16, the clamping device 80 can engage with the guide rails 66 of the clamp mounting portion 60 even when the arrangement of the first groove 816 and the second groove 836 is swapped with respect to the drive shaft DX. Furthermore, since both ends of the first groove 816 and the second groove 836, and both ends of the pair of guide rails 66 are open, the clamping device 80 can be engaged with the pair of guide rails 66 from either side in the extending direction D1. Thus, a flare forming tool 10 and a flare forming device 30 that are easy to attach the clamping device 80 can be provided.

[0108] A7. Rotation mechanism of the clamp mounting part 60: The rotation mechanism of the clamp mounting portion 60 will be described with reference to Figures 17 to 26. In the flare forming apparatus 30 of this embodiment, the clamp mounting portion 60 is configured to rotate around the drive shaft DX relative to the main housing 40 of the flare forming apparatus 30. In Figure 17, the insertion direction D1 of the clamp device 80 is approximately parallel to the left-right direction. Hereinafter, the rotation angle of the clamp device 80 in this state will also be referred to as the first rotation angle.

[0109] As shown in Figure 18, the clamp mounting portion 60 is rotatably attached to the rotating fixing portion 90 of the main housing 40 of the flare forming apparatus 30. The front portion 40F of the main housing 40 has a substantially annular shape and has a cylindrical portion 402 and an opening 406. The rotating fixing portion 90 is non-rotatably attached to the front portion 40F of the main housing 40.

[0110] The rotating fixing part 90 has a substantially annular shape with an opening 92 formed in the center. The front part 90F of the rotating fixing part 90 has a plurality of pin housing parts 94 for fixing the clamp mounting part 60 at a predetermined rotation angle, and a female screw part 96. The rotating fixing part 90 is fixed to the front part 40F of the main housing 40 so as not to rotate when a bolt B1 inserted through the opening 406 of the front part 40F of the main housing 40 is screwed into the female screw part 96.

[0111] The clamp mounting portion 60 is rotatably supported relative to the rotation fixing portion 90 by being connected to the support portion 64. The support portion 64 has a substantially annular shape with an opening 642 formed in the center. The front portion 64F of the support portion 64 has a restricting portion 644, a female threaded portion 646, and a cylindrical portion 648. The support portion 64 is fixed non-rotatably to the back portion 60B of the clamp mounting portion 60 by a bolt B2 inserted through an opening 602 formed in the front portion 60F of the clamp mounting portion 60 and screwed into the female threaded portion 646. As shown in Figure 19, the cylindrical portion 648 of the support portion 64 protrudes forward of the front portion 90F of the rotation fixing portion 90 and is fitted into a recess 604 formed in the back portion 60B of the clamp mounting portion 60.

[0112] As shown in Figure 18, a concave restricting portion 644 formed on the periphery of the front portion 64F of the support portion 64 engages with a protrusion 98 of the rotation fixing portion 90. The protrusion 98 projects radially inward from the periphery of the front end of the opening 92. As shown in Figure 19, the protrusion 98 is held between the restricting portion 644 of the support portion 64 and the back portion 60B of the clamp mounting portion 60. As a result, the clamp mounting portion 60 and the support portion 64 are rotatably held relative to the rotation fixing portion 90.

[0113] Furthermore, the recess 640 formed on the back of the support portion 64 is fitted with the cylindrical portion 402 of the front portion 40F of the main housing 40. As a result, the clamp mounting portion 60 and the support portion 64 are rotatably held relative to the main housing 40. In summary, the rotatable fixing portion 90 is fixed to the main housing 40 in a non-rotatable manner, while the clamp mounting portion 60 and the support portion 64 are rotatably held relative to the main housing 40 and the rotatable fixing portion 90.

[0114] As shown in Figure 18, the clamp mounting portion 60 includes an angle setting mechanism 68 which includes an angle setting pin 682. When the angle setting pin 682 is fitted into the pin housing portion 94 of the rotation fixing portion 90, the clamp mounting portion 60 is fixed at a predetermined rotation angle relative to the rotation fixing portion 90 and the main housing 40. The angle setting mechanism 68 includes a pin housing 680, an angle setting pin 682, and a release operation portion 688.

[0115] As shown in Figure 19, the angle setting pin 682 is a long, axial member. The angle setting pin 682 is housed in the through hole 683 of the pin housing 680 such that the long axis direction of the angle setting pin 682 is parallel to the drive shaft DX (front-rear direction).

[0116] In this embodiment, as shown in Figure 19, the angle-setting pin 682 is inserted into the through-hole 683 of the pin housing 680 and then covered with the cover portion 686 to complete its placement in the pin housing 680. The cover portion 686 is integrated with the pin housing 680 by screwing it into the pin housing 680.

[0117] The angle-setting pin 682 is positioned in a through-hole 683 of the pin housing 680 so as to be movable along the long axis. Specifically, by moving along the long axis, the angle-setting pin 682 can be switched between a protruding position in which the tip of the angle-setting pin 682 protrudes outward from the back portion 60B of the clamp mounting portion 60 and a retracted position in which the tip of the angle-setting pin 682 is housed in the pin housing 680. As shown in Figure 19, the angle-setting pin 682 in the protruding position can be fitted into the pin housing portion 94 of the rotation fixing portion 90.

[0118] A biasing member 684 is positioned around the angle-setting pin 682. The biasing member 684 is a compression coil spring and biases the angle-setting pin 682 in the rearward direction from the pin housing 680. The angle-setting pin 682's movement in the longitudinal direction is restricted by the inner wall of the pin housing 680, and under normal circumstances, it is positioned in a protruding position due to the biasing force of the biasing member 684.

[0119] In this embodiment, the angle-setting pin 682 has a pair of flange portions 682F. The pair of flange portions 682F are larger in diameter than the rest of the angle-setting pin 682. The pair of flange portions 682F are arranged to face each other on the long axis of the angle-setting pin 682. A connection portion 689 for the release operation portion 688 is located between the pair of flange portions 682F.

[0120] The connecting portion 689 is inserted into the through hole 683 through an opening 681 formed on the outer surface of the pin housing 680, and is connected to the angle-setting pin 682 between a pair of flange portions 682F. When the release operation portion 688 is moved in the front-rear direction, the connecting portion 689 biases the pair of flange portions 682F, and the angle-setting pin 682 moves in the front-rear direction. In other words, the position of the angle-setting pin 682 can be switched between a protruding position and a retracted position by operating the release operation portion 688. In this embodiment, since a biasing member 684 is provided, the user can move the angle-setting pin 682 to the retracted position by manually moving the release operation portion 688 against the biasing force of the biasing member 684.

[0121] As shown in Figure 19, when the clamp mounting portion 60 is positioned at a predetermined rotation angle in which the pin housing portion 94 is located, the angle-setting pin 682 moves to the protruding position due to the restoring force of the biasing member 684. As a result, the angle-setting pin 682 is fitted into the pin housing portion 94, and the rotation of the clamp mounting portion 60 relative to the main housing 40 and the rotation fixing portion 90 is restricted.

[0122] When the angle-setting pin 682 is positioned in the protruding position and fitted into the pin housing 94, the release operation unit 688 is positioned at the rear end of its range of motion. To change the rotation angle of the clamp mounting unit 60, the release operation unit 688 is slid forward by manual operation. As shown in Figure 20, when the release operation unit 688 is slid forward, the angle-setting pin 682 moves from the protruding position to the retracted position. As a result, the engagement between the angle-setting pin 682 and the pin housing 94 is released. The user can switch the clamp mounting unit 60 to a different rotation angle by rotating the clamp mounting unit 60 while the release operation unit 688 is slid forward.

[0123] As shown in Figure 21, the front portion 90F of the rotating fixing portion 90 has a plurality of pin housing portions 94 formed in the circumferential direction centered on the drive shaft DX. The positions of the plurality of pin housing portions 94 relative to the drive shaft DX define the rotation angle at which the clamp mounting portion 60 can be fixed. In this embodiment, the plurality of pin housing portions 94 are arranged to include 12 rotation angles at 30-degree intervals, as shown by rotation angles H1 to H12 in Figure 21. Note that rotation angle H1 is the first rotation angle shown in Figure 17.

[0124] Figures 22 to 26 show how the clamp mounting portion 60 is rotated relative to the rotation fixing portion 90. More specifically, Figures 22 to 26 show the clamp mounting portion 60 being rotated clockwise (CW) and sequentially fixed to a total of six pin housing portions 94 at 30-degree intervals corresponding to rotation angles H2 to H6.

[0125] As shown in Figure 21, in this embodiment, by rotating the clamp mounting portion 60, the insertion direction D1 when attaching the clamp device 80 to the clamp mounting portion 60 can be switched to 12 directions. Therefore, the clamp device 80 can be attached to the flare forming device 30 with the clamp device 80 in a state where the pipe P is clamped, without substantially changing the orientation (position) of the flare forming device 30.

[0126] In this embodiment, the clamping device 80 has open ends on both sides of the guide rail 66. Therefore, without changing the orientation (posture) of the flare forming device 30, the clamping device 80 can be attached to the clamping mounting part 60 from 12 directions relative to the drive shaft DX simply by rotating the clamping mounting part 60 to the six locations shown in Figures 22 to 26.

[0127] As shown in Figure 21, in this embodiment, the multiple pin housings 94 are positioned in a location that includes a rotation angle where the direction in which the clamping device 80 is inserted into the clamp mounting portion 60 coincides with the vertical direction, and a rotation angle where the direction in which the clamping device 80 is inserted into the clamp mounting portion 60 coincides with the left-right direction, in line with the extending direction of the gripping portion 150. Specifically, the multiple pin housings 94 are positioned in a location that includes an upper rotation angle H1, a right rotation angle H4, a lower rotation angle H7, and a left rotation angle H10 with respect to the drive shaft DX. With this configuration, the clamping device 80 can be inserted into the clamp mounting portion 60 in both the vertical and left-right directions. Therefore, the user can easily attach the clamping device 80 to the clamp mounting portion 60 while gripping the gripping portion 150. In this embodiment, if both sides of the clamp mounting portion 60 are open and the clamping device 80 can be attached from both sides of the clamp mounting portion 60, then either rotation angle H1 or rotation angle H7 of the multiple pin housing portions 94 may be omitted, or either rotation angle H4 or rotation angle H10 may be omitted. Even in this case, the clamping device 80 can be inserted into the clamp mounting portion 60 in the vertical and horizontal directions.

[0128] As shown in Figure 21, in this embodiment, the clamp mounting portion 60 can rotate in either the clockwise direction CW or the counterclockwise direction CC around the drive shaft DX when the main housing 40 is viewed from the front. Therefore, the amount of rotation required to rotate the clamp mounting portion 60 to the desired rotation angle can be reduced.

[0129] In this embodiment, the clamp mounting portion 60 is configured to rotate repeatedly around the drive shaft DX relative to the main housing 40. Therefore, the clamp mounting portion 60 can be switched to a desired rotation angle more effectively than when the rotation speed of the clamp mounting portion 60 relative to the main housing 40 is restricted.

[0130] The number of pin housings 94 can be arbitrarily set according to the desired rotation angle. However, it is preferable that the multiple pin housings 94 are arranged to include at least two locations: an arbitrarily set rotation angle (hereinafter also referred to as the "reference rotation angle") and a rotation angle rotated 90 degrees from the reference angle (hereinafter also referred to as the "orthogonal rotation angle"). With this configuration, the clamping device 80 can be inserted into the clamping mounting portion 60 from at least two mutually orthogonal directions. Therefore, the clamping device 80 can be attached without significantly changing the orientation (posture) of the flare forming device 30. In this embodiment, if both sides of the clamping mounting portion 60 are open and the clamping device 80 can be attached from both sides of the clamping mounting portion 60, the clamping device 80 can be inserted from at least four directions around the clamping mounting portion 60.

[0131] As described above, the clamping device 80 of this embodiment is configured such that the first main body 81 and the second main body 83 can be switched between an open position and a closed position using a force-multiplier mechanism via an operating mechanism 84. Therefore, with the clamping device 80 of this embodiment, the pipe P can be held with great force by a simple operation using the force-multiplier mechanism. Since the pipe P can be firmly held before the clamping device 80 is attached to the flare forming device 30, it is possible to suppress or prevent the pipe P from shifting position between the time the clamping device 80 is attached to the flare forming device 30.

[0132] The flare forming apparatus 30 of this embodiment includes a pair of guide rails 66 that can engage with a first groove 816 formed on the first side portion 81T and a second groove 836 formed on the second side portion 83T of the clamping apparatus 80. The flare forming apparatus 30 can hold the clamping apparatus 80 by engaging with the sides of the clamping apparatus 80. Therefore, the flare forming apparatus 30 can mount the clamping apparatus 80 without providing any mounting members for the clamping apparatus 80 extending to the front of the clamping apparatus 80. Consequently, the length of the flare forming apparatus 30 in the front-rear direction can be shortened, making the flare forming apparatus 30 smaller than conventional models.

[0133] In the flare forming apparatus 30 of this embodiment, the clamp mounting portion 60 rotates around the drive shaft DX relative to the main housing 40 and is configured to be fixed to the main housing 40 at multiple rotation angles. By switching the rotation angle of the clamp mounting portion 60 according to the orientation of the clamp device 80, the clamp device 80 can be attached to the clamp mounting portion 60 without substantially changing the orientation (position) of the flare forming apparatus 30 relative to the clamp device 80. Therefore, a decrease in work efficiency when attaching the clamp device 80 in a confined space can be suppressed or prevented.

[0134] B. Other embodiments: The flare forming tool 10 in the first embodiment described above is an electric power tool specifically for flaring work, in which the flare forming device 30 is incorporated into the tool housing 11 together with the motor 21, etc. In contrast, the flare forming device 30 may be configured as an attachment that can be attached to a well-known electric power tool (rotary tool) configured to rotate the tip tool around a drive shaft. With this configuration, the user can attach the flare forming device 30 to the electric power tool at the desired timing and use it as a flare forming tool. Therefore, the range of operations that the electric power tool can be used for can be increased, and convenience can be improved.

[0135] The flare forming device 30 may be selectively attached to and used with rotary tools such as driver drills, drilling tools, and fastening tools. Alternatively, the flare forming device 30 may be selectively attached to and used with manual tools equipped with a manually rotatable connecting shaft, rather than with electric tools, or it may be integrated with such manual tools to constitute a manual flare forming tool.

[0136] The correspondence between each component (feature) of the above embodiments and each component (feature) of the present disclosure or invention is shown below. However, each component of the embodiments is merely an example and does not limit each component of the present disclosure or invention.

[0137] The flare forming tool 10 is an example of a "flare forming tool". The flare forming device 30 and the clamp mounting part 60 are examples of a "flare forming device". The clamping device 80 is an example of a "clamping device". The first main body part 81, the second main body part 83, and the main body part 800 are examples of the "first main body part", "second main body part", and "main body part", respectively. The first connecting part 841 is an example of a "first connecting part". The clamping hole 82 is an example of a "clamping hole". The operating mechanism 84 is an example of an "operating mechanism". The fitting hole 664 is an example of a "first fitting hole". The positioning pin 88 is an example of a "positioning pin". The first opposing part 81S and the second opposing part 83S are examples of the "first opposing part" and "second opposing part", respectively. The fixing pin 89 and the fitting hole 834 are examples of a "fixing pin" and "second fitting hole", respectively. The biasing member 882 is an example of a "biasing member". The operating section 87 is an example of an "operating section". The first link 846, the second link 848, and the second connecting section 842 are examples of a "first link", "second link", and "second connecting section". The operating mechanism 84 is an example of a "toggle mechanism". The first groove 816 and the second groove 836 are examples of "grooves". The guide rail 66 is an example of a "guide rail". The extending direction D1 is an example of an "extending direction". The pipe P is an example of a "pipe".

[0138] Furthermore, the clamping device, flare forming device, and flare forming tool relating to this disclosure are not limited to the clamping device 80, flare forming device 30, and flare forming tool 10 of the above embodiment. For example, modifications are possible, as are non-limitingly illustrated below. At least one of these modifications may be adopted in combination with the clamping device 80, flare forming device 30, flare forming tool 10 of the embodiment and at least one of the features described in the claims.

[0139] (B1) In the first embodiment described above, an example was shown where the power-multiplying mechanism was a toggle mechanism. However, the power-multiplying mechanism is not limited to a toggle mechanism, but may be various mechanisms such as a cam, lever, crank, or link.

[0140] (B2) In the first embodiment described above, an example was shown in which a biasing member 882 is arranged around the positioning pin 88. However, the biasing member 882 may be omitted. In this case, the user switches between the protruding position and the retracted position of the positioning pin 88 by manually operating the operating unit 87, for example, by fitting the positioning pin 88 into the fitting hole 664.

[0141] (B3) In the first embodiment described above, an example was shown in which the first groove 816 is formed on the first side portion 81T and the second groove 836 is formed on the second side portion 83T. In contrast, the first groove 816 may be located on a side different from the first side portion 81T of the left side portion 81L and the right side portion 81R. The second groove 836 may be located on a side different from the second side portion 83T of the left side portion 83L and the right side portion 83R.

[0142] This disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from its spirit. For example, the technical features in the embodiments corresponding to the technical features in each form described in the summary of the invention can be replaced or combined as appropriate in order to solve some or all of the above-described problems, or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate. [Explanation of symbols]

[0143] 5…Main shaft, 6…Feed screw mechanism, 7…Clutch mechanism, 10…Flare forming tool, 11…Tool housing, 15…Handle section, 17…Battery mounting section, 19…Battery, 20…Controller, 21…Motor, 23…Reduction mechanism, 30…Flare forming device, 40…Main housing, 40F…Front section, 43…Transmission shaft, 44…Auxiliary spring, 46…Housing, 51…Slide section, 52…Front end section, 53…Rear end section, 55…Shaft section, 56…Male screw section, 57…Cone, 60…Clamp mounting section, 60B…Back section, 60F…Front section, 62…Opening, 64…Support section, 64F… Front, 66... ​​Guide rail, 68... Angle setting mechanism, 71... Fixing sleeve, 73... Movable flange, 75... Compression spring, 77... Rotation stopper, 81... First main body, 81B... Back, 81F... Front, 81L... Left side, 81R... Right side, 81S... First opposing part, 81T... First side, 82... Clamp hole, 82T... Tapered part, 83... Second main body, 83B... Back, 83F... Front, 83L... Left side, 83R... Right side, 83S... Second opposing part, 83T... Second side, 84... Operating mechanism, 86... Stopper, 86T... Tip, 87... Operating part, 88... Positioning pin, 88T... Tip, 89... Fixing pin ,89T...tip, 90...rotating fixing part, 90F...front part, 92...opening, 94...pin housing part, 96...female thread part, 98...protrusion, 111...opening, 150...gripping part, 151...trigger, 153...switch, 212...output shaft, 233...output gear, 402...cylindrical part, 406...opening, 407...shoulder part, 431...bearing, 432...bearing, 510...bearing, 551...connecting hole, 571...conical part, 573...shaft part, 581...radial bearing, 602...opening, 604...recess, 640...recess, 642...opening, 644...regulating part, 646...female thread part, 648... Cylindrical part, 662...Pressing part, 662C...Second part, 662E...First part, 664...Matching hole, 680...Pin housing, 681...Opening, 682...Angle setting pin, 682F...Flange part, 683...Through hole, 684...Biasing member, 686...Lid part, 688...Release operation part, 689...Connecting part, 711...First sleeve, 715...Second sleeve, 734...Clutch pin, 737...Female thread part, 781...Thrust bearing, 785...Washer, 800...Main body part, 811...First recess, 816...First groove, 832...Second recess, 834...Matching hole, 836...Second groove, 841...First connecting part,842...Second connecting part, 843...Third connecting part, 844...Fourth connecting part, 845...Lever, 846...First link, 848...Second link, 872...Connecting part, 882...Biasing member, 884...Flange part, 886...Lid part, B1, B2...Bolt, DX...Drive shaft, P...Pipe,

Claims

1. A clamping device that can be attached to a flaring apparatus, A main body including a first main body and a second main body, A first connecting portion that rotatably connects the first main body portion and the second main body portion, The first main body is rotatably connected to the second main body, and the operating mechanism is capable of switching the first main body and the second main body between (i) a closed position in which the first main body and the second main body are close to each other and clamp holes are formed in the main body, and (ii) an open position in which the first main body and the second main body are separated. Clamping device.

2. A clamping device according to claim 1, The first main body is equipped with a positioning pin that can be fitted into a first fitting hole formed in the flare forming apparatus, The positioning pin is configured to move inside the first main body and be switchable between (i) a protruding position where it protrudes outward from the first main body and can be fitted into the first fitting hole, and (ii) a housing position where it is housed in the first main body. Clamping device.

3. A clamping device according to claim 2, The first main body further comprises a first opposing portion that faces the second main body in the closed position, and a fixing pin that protrudes outward from the first opposing portion. The second main body comprises a second opposing portion that faces the first opposing portion in the closed position, and a second fitting hole provided in the second opposing portion that can be fitted with the fixing pin in the closed position. The fixing pin is integrated with the positioning pin. Clamping device.

4. A clamping device according to claim 2 or claim 3, Furthermore, the system includes a biasing member that biases the positioning pin from the housing position toward the protruding position, When the clamping device is positioned in the fixed position of the flare forming device, the positioning pin is switched from the housing position to the protruding position by the biasing force of the biasing member and fitted into the first fitting hole. The clamping device is fixed to the fixed position by the positioning pin fitted into the first fitting hole. Clamping device.

5. A clamping device according to any one of claims 2 to 4, Furthermore, it includes an operating unit connected to the positioning pin, which is configured to move the positioning pin and switch between the protruding position and the retracted position. Clamping device.

6. A clamping device according to any one of claims 1 to 5, The aforementioned operating mechanism is A first link rotatably connected to the first main body, A second link rotatably connected to the second main body, It comprises a second connecting portion that rotatably connects the first link and the second link, The power assist mechanism is a toggle mechanism including the first connecting portion, the first link, the second link, and the second connecting portion. Clamping device.

7. A clamping device according to any one of claims 1 to 6, At least one of the first main body portion and the second main body portion has a groove portion that extends in a straight line, The groove portion is configured to be engageable with a guide rail provided in the flare forming device. Clamping device.

8. A clamping device according to claim 7, which is directly or indirectly dependent on claim 2, The first main body portion has the groove portion, The positioning pin is Provided in the groove portion of the first main body, The flare forming apparatus is configured to be fitted into the first fitting hole formed in the guide rail, Clamping device.

9. A clamping device according to claim 7 or claim 8, which is directly or indirectly dependent on claim 2, The positioning pin is configured to be switchable between the protruding position and the retracted position by moving within the first main body in a direction intersecting the extending direction of the groove. Clamping device.

10. An electric flaring tool, A flaring device that forms a flare at the end of a pipe, A clamping device according to any one of claims 1 to 9, comprising: Flaring tool.

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