Pipe end face control tool and flare forming tool using said control tool

Abstract

To provide a flare-forming tool easy to use and capable of securely matching an end surface of a pipe inserted into a gauge bar and an upper surface of the gauge bar.SOLUTION: A flare forming tool A includes: a gauge bar 22 having a plurality of pipe holding holes 40 for holding an end of a metal pipe P; a yoke body 24 which is attached to the gauge bar 22, slides along a longitudinal direction thereof, and holds a conical eccentric cone 16 that presses the end of the metal pipe P against a flare processing surface 41 of the pipe holding hole 40 to form a flare; and a pipe end surface restrictor 1 that matches an end surface T of the metal pipe P with an upper surface 22 of the gauge bar 22 formed with the flare processing surface 41. The pipe end surface restrictor 1 has a size protruding into the pipe holding hole 40 opening in the upper surface 22j of the gauge bar 22, and comprises: a pipe end restriction piece 2 in contact with the end surface T of the metal pipe P inserted into a selected one of the pipe holding holes 40 from the lower surface side; and magnetism or a magnet 5 to be magnetically attracted onto the gauge bar 22.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an improvement in a pipe end face restraining device used when flaring the end of a metal pipe, and to a flare forming tool using the improved restraining device. [Background technology]

[0002] Conventionally, when connecting an indoor unit and an outdoor unit of an air conditioner, it is necessary to enlarge the end of a metal pipe into a conical shape, and a flare forming tool is used as a piping tool for performing such flaring.

[0003] A conventional flare forming tool includes a rotating handle, a cone shaft that is fixed to the rotating handle and has a cone mounting part at its lower end and rotates integrally with the rotating handle, an eccentric cone for flare processing that is provided on the underside of the cone mounting part, a feed screw that is coaxially attached to the cone shaft between the rotating handle and the cone mounting part and has a male thread engraved on its outer circumferential surface, a gauge bar that has a number of pipe holding holes of different diameters, a yoke body that has a female thread at its upper part that screws into the male thread of the feed screw and has a gauge bar sliding groove at its lower part through which the gauge bar is slidably inserted, and a tightening clamp that is attached to the yoke body and fixes the gauge bar that has been inserted into the gauge bar sliding groove to the yoke body.

[0004] When performing flaring using this flare forming tool, the gauge bar is opened to the left and right, and the end of the pipe is inserted into the pipe holding hole of the gauge bar that matches the size of the pipe to be flared, and the gauge bar is closed so that the end face of the pipe is visually align with the top surface of the gauge bar. The yoke body of the flare forming tool is then moved over the pipe holding hole in which the pipe is held, and the clamp handle is turned to lower the eccentric cone. As the conical surface of the eccentric cone rotates against the inner surface of the end of the pipe, this portion is pressed against the flare processing surface provided at the opening of the pipe holding hole, and the end is spread out into an inverted cone shape, thereby forming a flare at the tip of the pipe.

[0005] At this time, if the top surface of the gauge bar on the eccentric cone side does not match the end surface of the pipe held in the pipe holding hole of the gauge bar, an accurate flare will not be formed. In particular, misalignment is likely to occur when checking visually. Therefore, a flare forming tool has been proposed that includes a pipe end surface regulating device that butts the end surface of the pipe against the top surface of the gauge bar before flaring to make the end surface match the top surface of the gauge bar (Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3198457 Summary of the Invention [Problem to be solved by the invention]

[0007] The pipe end face restricting tool of the flare forming tool described in Patent Document 1 is a U-shaped member that is slidably fitted into the gauge bar so as to embrace the upper and lower faces from one side of the gauge bar. The pipe end restricting piece, which is the upper piece of this pipe end face restricting tool that slides along the upper face of the gauge bar, is formed to a length that closes the pipe holding hole that opens from the sliding side face of the gauge bar to the upper face of the gauge bar. Meanwhile, the lower piece that slides along the lower face of the gauge bar is provided with a guide claw or guide pin that is slidably fitted into a guide groove provided in the longitudinal direction on the lower face of the gauge bar. The above-mentioned guide groove is dug on the back side of the gauge bar between one side and the pipe holding hole.

[0008] When using the above-mentioned flare forming tool, the end face of the pipe inserted into the pipe holding hole of the gauge bar is brought into contact with the pipe end regulating piece of the pipe end face restricting device so that the upper face of the gauge bar is aligned with the end face of the pipe, the pipe end face restricting device is then shifted to a position where it does not interfere with the flaring process, and finally the gauge bar is moved so that the center of the pipe is aligned with the lower tip of the eccentric cone, and in this state the handle is turned to perform the flaring process as described above.

[0009] However, the flare forming tool described in Patent Document 1 has the following problems. (a) To attach the pipe end face control device, a guide groove that did not originally exist in the gauge bar must be newly drilled by milling, which leads to increased costs, and this flare forming tool cannot use conventional gauge bars without guide grooves. A dedicated gauge bar is required. (b) In order to prevent the pipe end face restricting device from coming off the gauge bar, the above-mentioned guide groove and a guide pin or a folded guide tab that fits into this guide groove and slides to prevent it from coming off are required. (c) In order for the pipe end restraint to slide smoothly along the gauge bar while being guided by the guide groove, a certain amount of clearance is required between the pipe end restraint and the gauge bar. When the pipe is inserted into the pipe holding hole of the gauge bar from below and the end face of the pipe hits the pipe end restraint piece of the pipe end restraint to position the pipe end, the pipe end restraint piece is lifted by the amount of this clearance and separated from the top surface of the gauge bar by that amount, which leads to defective flaring. (d) The pipe end face control device is attached so as to slide lightly onto the gauge bar and has no fixing means, so if the hand is released from the pipe end face control device during the pipe end positioning operation, it may come off from the pipe retaining hole during pipe end positioning. (e) Since the guide groove is provided along one of the underside edges of the gauge bar, the pipe end restriction device can only be attached to the side where the guide groove is provided. In other words, both sides of the gauge bar cannot be used depending on the situation at the construction site, which is inconvenient.

[0010] The present invention has been made in consideration of the problems associated with the conventional examples, and an object of the present invention is to provide a pipe end face restricting device which can be used with conventional gauge bars, can be attached to either side of the gauge bar, and can be used in accordance with the conditions at the construction site, and can reliably ensure that the end face of the pipe inserted into the gauge bar is aligned with the upper face of the gauge bar, and a flare forming tool equipped with said restricting device. [Means for solving the problem]

[0011] The invention described in claim 1 (FIGS. 5 to 7) is as follows: The pipe end face regulating tool 1 includes a gauge bar 22 having a plurality of pipe holding holes 40 penetrating from a lower surface to an upper surface 22j and holding an end of a metal pipe P, the gauge bar 22 being slidably held, and used in a flare forming tool A that performs flaring on an end of a metal pipe P held in any one of the pipe holding holes 40 of the gauge bar 22, The pipe end face regulating device 1 is characterized in that it has a size that protrudes into the pipe holding hole 40 along the upper surface 22j of the gauge bar 22, and is equipped with a pipe end regulating piece 2 that abuts against the end face T of the metal pipe P inserted from the underside into the selected pipe holding hole 40, and is equipped with a magnet or magnet 5 that is magnetically attracted to the gauge bar 22.

[0012] Claim 2 relates to the pipe end face regulation device 1 described in claim 1 (FIGS. 5 and 6), The piping end face control device 1 is composed of the pipe end control piece 2, a side piece 3 arranged along one side of the gauge bar 22, and a bottom piece 4 arranged along the bottom face of the gauge bar 22, and is characterized in that the upper end of the side piece 3 is connected to one end of the pipe end control piece 2 and the lower end of the side piece 3 is connected to one end of the bottom piece 4.

[0013] Claim 3 relates to the pipe end face regulation device 1 according to claim 1 (FIG. 7), The piping end face control device 1 is characterized in that it is composed of the pipe end control piece 2 and a side piece 3 arranged along one side of the gauge bar 22, and the upper end of the side piece 3 is connected to one end of the pipe end control piece 2.

[0014] The invention described in claim 4 is as follows: The flare forming tool A includes a gauge bar 22 having a plurality of pipe holding holes 40 penetrating from the lower surface to the upper surface 22j and holding an end of a metal pipe P, a yoke body 24 attached to the gauge bar 22, sliding along the longitudinal direction of the gauge bar 22, and holding a conical eccentric cone 16 that presses the end of the metal pipe P against a flare processed surface 41 of the pipe holding hole 40 to form a flare, and a pipe end face control device 1 according to any one of claims 1 to 3 that slides along the longitudinal direction of the gauge bar 22 and aligns an end face T of the metal pipe P with the upper surface 22j of the gauge bar 22 on which the flare processed surface 41 is formed. Effect of the Invention

[0015] According to the present invention, the pipe end face control device 1 is magnetically attracted to the gauge bar 22, so that even if the end face T of the metal pipe P is butted against the pipe end control piece 2, the end face T can be reliably aligned with the upper face 22j of the gauge bar 22 without being displaced by the butting force. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view showing a flare forming tool according to the present invention. [Diagram 2] 2A is a vertical sectional view taken along the line X-X' in FIG. 1 during flaring, and FIG. 2B is a partial sectional view showing the relationship between the locking pin and the locking hole as viewed from the direction B. [Diagram 3] 2 is an enlarged vertical cross-sectional view taken along the line XX' in FIG. 1 before or after flaring. [Figure 4] FIG. 2 is a partial enlarged view of a gauge bar to which the pipe end face regulating device of the first embodiment is attached. [Diagram 5] 1A is a vertical cross-sectional view showing an attached state of a first embodiment of a piping end face regulating device, FIG. 1B is a plan view of the piping end face regulating device, and FIG. [Figure 6] FIG. 11 is a vertical cross-sectional view showing an attached state of a second embodiment of a pipe end face restriction device. [Figure 7] FIG. 11 is a vertical cross-sectional view showing an attached state of a third embodiment of a pipe end face restriction device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] A detailed description of a flare forming tool A according to an embodiment of the present invention will be given below with reference to the drawings. The flare forming tool A is generally composed of a gauge bar 22, a yoke body 24, a pipe end face regulating tool 1, and a mechanism part 20. The mechanism 20 is composed of a rotary handle 12, a cone shaft 14, an eccentric cone 16, a feed screw 18, a pressure spring 26, and the like.

[0018] The rotary handle 12 has an outer shape like a circular block, with six gripping portions 12a protruding outwardly at equal angular intervals around the periphery (see FIG. 1). A driver hole 12b having a rectangular cross section is recessed in the center of the upper surface of the rotating handle 12 so as to coincide with the axis, and a shaft mounting hole 12c having a circular cross section, which is coaxial with the driver hole 12b, is formed in the lower surface and communicates with the driver hole 12b.

[0019] A locking pin holding hole 12d is formed in the vicinity of the shaft mounting hole 12c in parallel to the shaft mounting hole 12c. A locking pin 36 is inserted into the locking pin holding hole 12d so as to be slidable in its protruding and retracting direction, and is biased in the extruding direction by a coil spring 37 housed in the locking pin holding hole 12d.

[0020] The cone shaft 14 is formed of a thin shaft body 14a and a cone attachment part 14b at the lower end, which is larger in diameter than the shaft body 14a, and the upper end of the shaft body 14a is inserted into the shaft attachment hole 12c. The locking pin 36 has a groove 38 on its outer periphery, into which the tip of a holding pin 28 attached at a right angle to the shaft body 14a is fitted, and the rotating handle 12 and the cone shaft 14 are locked and fixed so that they can move vertically together with a predetermined vertical play. Although not shown, the locking pin 36 is provided with a rotation stopper so that it does not rotate in the locking hole 18f.

[0021] An inclined hole 14c inclined with respect to the cone shaft 14 is drilled in the lower surface of the cone attachment portion 14b, and the eccentric shaft 16a of the eccentric cone 16 is inserted eccentrically rotatably through a thrust bearing 30 and a needle bearing 32. A C-shaped ring 34 is attached to the eccentric shaft 16a to prevent the eccentric shaft 16a from falling out of the inclined hole 14c. This allows the eccentric cone 16 to rotate around the central axis of the cone shaft 14. The tip of the cone-shaped eccentric cone 16 coincides with the central axis of the cone shaft 14, and the generatrix of the eccentric cone 16 coincides with the flare surface 41 of a pipe holding hole 40 of a gauge bar 22 described later.

[0022] The upper outer peripheral edge of the cone mounting portion 14b serves as an engagement edge 14d for preventing it from coming loose, and engages with a stepped lower edge at the lower end of a feed screw hole 24a into which a female screw 24b of the yoke body 24, which will be described later, is screwed.

[0023] The eccentric cone 16 is composed of an eccentric shaft 16a and a conical head 16b, and the conical head 16b is exposed at an angle from the lower surface of the cone attachment portion 14b.

[0024] The feed screw 18 has a disk-shaped flange portion 18a formed at its upper portion, and a body portion 18b that is narrower than the flange portion 18a is suspended from the underside of the flange portion 18a. A cylindrical portion 18g that is not threaded (having a diameter equal to or smaller than the root diameter of the male thread 18c) is provided at the insertion tip of the body portion 18b, and a male thread 18c is threaded between the cylindrical portion 18g and the flange portion 18a. The outer diameter of the cylindrical portion 18g is equal to or smaller than the root diameter of the male thread 18c, and is therefore formed to be slightly narrower than the inner diameter of the threads of the female thread 24b that is threaded into the yoke body 24 described below.

[0025] A slide hole 18d, through which the shaft body 14a of the cone shaft 14 is inserted so as to be rotatable and slidable, is drilled from the flange portion 18a to the middle of the body portion 18b, and a thick spring storage hole 18e is drilled from the lower end of the slide hole 18d to the underside of the body portion 18b.

[0026] The flange portion 18a is provided with an engaging hole 18f that penetrates vertically, and the lower end of the engaging pin 36 inserted into the engaging pin holding hole 12d fits into this engaging hole 18f.

[0027] The gauge bar 22 is composed of rod-shaped half members 22a, 22b that can be opened and closed, and a plurality of pipe holding holes 40 with different diameters are formed in the mating surfaces of the half members 22a, 22b when they are closed. Therefore, each pipe holding hole 40 is formed in a half-split shape. And, on the opening edge of the pipe holding hole 40 on the upper surface 22j side of the gauge bar 22, a flare processed surface 41 that is largely chamfered into a V-shaped cross section is formed.

[0028] The yoke body 24 is formed of a gate-shaped lower part (gauge support part 24f) and a cylindrical part 24g formed integrally with the upper surface of the gate-shaped lower part. A feed screw hole 24a opening to the upper surface is drilled in the cylindrical part 24g, and a female screw 24b is drilled in the inner surface of the feed screw hole 24a.

[0029] An intermediate hole 24d having an inner diameter larger than that of the feed screw hole 24a is formed from the lower edge of the feed screw hole 24a (this part is the anti-slip step 24c which engages with the cone mounting portion 14b of the cone shaft 14), and a lower hole 24e having an even larger inner diameter than the intermediate hole 24d is formed from the lower edge of the intermediate hole 24d and opens into a gauge support portion 24f provided at the bottom of the yoke body 24.

[0030] Here, the inner diameter of the feed screw hole 24a is smaller than the outer diameter of the cone mounting portion 14b, and the inner diameter of the intermediate hole portion 24d is slightly larger than the outer diameter of the cone mounting portion 14b, so that when the feed screw 18 is screwed back and the cone shaft 14 is pulled into the cylindrical portion 24g, the cone mounting portion 14b is stored within the intermediate hole portion 24d (see Figure 3). A needle bearing 25 is mounted in the lower hole 24e to support the rotation of the cone mounting portion 14b.

[0031] The lower edge of the feed screw hole 24a is formed stepped relative to the intermediate hole portion 24d, and this stepped portion engages with the engagement edge 14d at the upper edge of the cone attachment portion 14b when the cone shaft 14 is pulled in when the feed screw 18 is screwed back. At this time, the male thread 18c of the feed screw 18 unscrews from the female thread 24b of the feed screw hole 24a, and the cylindrical portion 18g, which is not threaded, rotates freely within the female thread 24b.

[0032] The compression spring 26 is stored in the spring storage hole 18e, with its upper end elastically contacting the ceiling of the spring storage hole 18e and its lower end elastically contacting the cone mounting portion 14b via a thrust bearing 27, thereby biasing the cone shaft 14 downwardly from the feed screw 18.

[0033] The gauge support portion 24f of the yoke body 24 is a gate-shaped portion at the bottom of the yoke body 24 that penetrates the front and rear walls and has a gauge bar sliding groove 24h on the inner surfaces of both side walls, through which the gauge bar 22 is inserted. The gauge bar sliding groove 24h is formed at a right angle to the central axis of the yoke body 24. A fastening clamp 42 is provided on one wall surface of this gauge support portion 24f so as to fix the gauge bar 22 in alignment with the center of rotation of the eccentric cone 16.

[0034] The pipe end face regulation tool 1 is available in various shapes as shown in Figures 5 to 7. Here, a first embodiment will be described (Figure 5). 5 is made of metal (for example, a ferromagnetic material such as iron) and is formed into a U-shaped vertical section, with an upper piece being a pipe end restricting piece 2 that slides longitudinally on the upper surface of a gauge bar 22, and a lower piece being a bottom piece 4 that slides longitudinally on the lower surface of the gauge bar 22, and the pipe end restricting piece 2 and bottom piece 4 are connected by a side piece 3. That is, the upper end of the side piece 3 is connected to one end of the pipe end restricting piece 2, and the lower end of the side piece 3 is connected to one end of the bottom piece 4. The distance between the tube end regulating piece 2 and the bottom piece 4 (the length of the side piece 3 ) is approximately the same as the upper and lower thicknesses of the gauge bar 22 , and is capable of sliding along the gauge bar 22 .

[0035] The length from the connection end on the side piece 3 side of the tube end restricting piece 2 to its tip is set to a length or width sufficient to cover part or all of the pipe holding hole 40 of the gauge bar 22, and the surface of the underside of the tube end restricting piece 2 that makes sliding contact with the upper surface 22j of the gauge bar 22 is defined as the restricting surface 2a against which the tube end T of the metal pipe P abuts. The tip of the tube end restricting piece 2 located above the pipe holding hole 40 is formed into a V-shape whose width gradually decreases towards the tip, or, although not shown, into a square, circle, etc. A recess 3a is formed on the inner surface of the side piece 3, and a magnet 5 is attached in this recess 3a.

[0036] 4, this pipe end restriction device 1 is fitted into the gauge bar 22 from the side and is magnetically attracted to the side of the gauge bar 22 by the magnet 5, and the pipe end restriction piece 2 covers the pipe holding hole 40 of the gauge bar 22 from above. In this case, the pipe end restriction device 1 can be fitted into use from either side depending on the site.

[0037] The magnet 5 fixed to the side piece 3 of the piping end face control tool 1 has a portion magnetically attracted to the gauge bar 22 and a portion on the side piece 3 side magnetized with different polarities, and is strongly magnetically attracted to the side of the gauge bar 22. The lower piece 4 of the magnetically attracted pipe end face control device 1 must leave open the pipe holding hole 40 opening on the lower surface of the gauge bar 22, so its length is shorter than that of the pipe end control piece 2 and does not reach the pipe holding hole 40.

[0038] An example of a procedure for flaring the end of the metal pipe P using the flare forming tool A configured as above will be described. With the tightening clamp 42 loosened, the gauge bar 22 is slidably inserted into the gauge bar sliding groove 24h of the yoke body 24, and the clearance between the inner dimension of the gauge bar sliding groove 24h and the width of the gauge bar 22 allows the gauge bar 22 to be opened and closed at a large angle.

[0039] First, a pipe holding hole 40 having an inner diameter matching the metal pipe P to be flared is selected, and the yoke body 24 is moved to a position away from the pipe holding hole 40. Next, the pipe end face regulating tool 1 is moved to the pipe holding hole 40. The pipe end regulating piece 2 of the moved pipe end face regulating tool 1 closes the upper opening of the pipe holding hole 40 while contacting the upper surface 22j of the gauge bar 22.

[0040] Then, the end of the metal pipe P is inserted from the bottom opening side into the pipe holding hole 40 in which the pipe end face regulation tool 1 is installed, and the end face T of the metal pipe P is butted against the pipe end regulation piece 2, so that the upper face 22j of the gauge bar 22 and the end face T of the metal pipe P are aligned. At this time, even if the end face T of the metal pipe P is butted against the regulation face 2a of the pipe end regulation piece 2 with a certain amount of force, the pipe end face regulation tool 1 is magnetically attracted to the gauge bar 22 by the magnet 5, so that even if there is a small gap between the gauge bar 22 and the pipe end face regulation tool 1 to enable sliding movement, the pipe end face regulation tool 1 will not shift from the gauge bar 22 due to the strong magnetic attraction, and moreover, the regulation face 2a will not separate from the upper face 22j of the gauge bar 22 due to the strong magnetic attraction, so that the upper face 22j of the gauge bar 22 and the end face T of the metal pipe P can be aligned. Thereafter, while holding the metal pipe P in that state, the pipe end face control tool 1 is shifted to a position where it does not interfere with the yoke body 24. Next, the yoke body 24 is moved to immediately above the pipe holding hole 40 that holds the metal pipe P.

[0041] Next, the tightening clamps 42 are tightened to firmly fix the gauge bar 22 to the yoke body 24. At this point, the center of the metal pipe P in the corresponding pipe holding hole 40 and the axis of the cone shaft 14 are aligned.

[0042] Once the axes are aligned, when the rotating handle 12 is rotated in the forward direction, the rotational force of the rotating handle 12 is transmitted to the cone shaft 14, and the feed screw 18 screws into the yoke body 24, moving the eccentric cone 16 toward the gauge bar 22. The eccentric cone 16 then pushes the end T of the metal pipe P along the flare processing surface 41, thereby flaring it (Figure 2).

[0043] When the rotary handle 12 is further rotated in the forward direction after the flaring of the metal pipe P is completed, the eccentric cone 16 rotates while sliding on the flared portion of the metal pipe P, and the cone shaft 14 stops in that position, but the feed screw 18 further advances in accordance with the forward rotation of the rotary handle 12. As a result, the engaging / disengaging hole 18f of the feed screw 18 moves in the direction of coming out of the retaining pin 28 relative to the retaining pin 36, which is engaged with the retaining pin 28 and stopped in that position.

[0044] 2(b), when the retaining pin 28 reaches the inclined surface 36a at the lower end, the inclined surface 36a abuts against and slides against the opening edge of the engaging / disengaging hole 18f, and the retaining pin 28 is pushed up against the coil spring 37, disengaging from the engaging / disengaging hole 18f and the rotating handle 12 starts to spin freely. This stops the feed screw 18 from screwing forward, indicating the end of flaring.

[0045] When the flaring is completed, the rotating handle 12 is rotated counterclockwise. When the rotating handle 12 is rotated counterclockwise, as can be seen from Fig. 2(b), the elastic force of the coil spring 37 causes the side surface 36b opposite to the inclined surface 36a of the retaining pin 28 to enter the engaging / disengaging hole 18f and engage with the opening edge of the engaging / disengaging hole 18f, and the feed screw 18 is rotated counterclockwise to move in the unscrewing direction. As a result, the eccentric cone 16 is pulled up and released from the flared portion of the metal pipe P. Then, the fastening clamp 42 is loosened, the gauge bar 22 is opened, the half members 22a, 22b are spread apart, and the flared metal pipe P is pulled out, completing the flaring process.

[0046] Another example of the pipe end face restricting device 1 will be described. The pipe end face restricting device 1 in Fig. 5 has the magnet 5 attached to its side piece 3 as described above, but the location of the magnet 5 is not limited to this portion and it may be attached to the pipe end restricting piece 2. When the magnet 5 is attached to the pipe end restricting piece 2, the pipe end restricting piece 2 is directly magnetically attracted to the upper surface 22j of the gauge bar 22, which is preferable to attaching the magnet 5 to the side piece 3. Also, while the magnet 5 is used in the above case, the pipe end face restricting device 1 itself may be composed of a magnetic plate (Fig. 6). In this case, the inner surface and the outer surface are magnetized to opposite poles.

[0047] 7 shows a pipe end face restriction device 1 made of a magnetic plate, with the entire pipe end face restriction device 1 magnetically attracted to the top face 22j and side face of the gauge bar 22, with the bottom piece 4 omitted and an L-shaped cross section. Although not shown, the simplest structure of the pipe end face restriction device 1 may be one in which the pipe end face restriction device 1 is made of a magnetic plate, the side piece 3 is eliminated, and the pipe end restriction device 1 is made of only the pipe end restriction piece 2. [Explanation of symbols]

[0048] A: flare forming tool, P: metal pipe, T: end face, 1: pipe end face regulation tool, 2: pipe end regulation piece, 2a: regulation surface, 3: side piece, 3a: recess, 4: bottom piece, 5: magnet, 12: rotating handle, 12a: grip, 12b: driver hole, 12c: shaft mounting hole, 12d: locking pin holding hole, 14: cone shaft, 14a: shaft body, 14b: cone mounting part, 14c: inclined hole, 14d: engagement edge, 16: eccentric cone, 16a: eccentric shaft, 16b: conical head, 18: feed screw, 18a: flange part, 18b: body part, 18c: male thread, 18d: slide hole, 18e: spring storage hole, 18f: engagement hole, 18g: cylindrical part, 20: mechanism part, 22: gauge bar, 22a-22b: half body member, 22j: upper surface, 24: yoke body, 24a: feed screw hole, 24b: female thread, 24c: retaining step, 24d: intermediate hole, 24e: lower hole, 24f: gauge support part, 24g: cylindrical part, 24h: gauge bar sliding groove, 25: needle bearing, 26: pressure spring, 27: thrust bearing, 28: retaining pin, 30: thrust bearing, 32: needle bearing, 34: C-ring, 36: locking pin, 36a: inclined surface, 36b: side surface opposite to inclined surface, 37: coil spring, 38: recessed groove, 40: pipe retaining hole, 41: flared surface, 42: fastening clamp

Claims

1. A pipe end face regulating device for use in a flare forming tool that includes a gauge bar that penetrates from a lower surface to an upper surface and has a plurality of pipe holding holes that hold ends of metal pipes, the gauge bar being slidably held, and that performs flaring on an end of a metal pipe held in any one of the pipe holding holes of the gauge bar, The piping end face regulating device is characterized in that it has a size that protrudes into the piping holding hole along the upper surface of the gauge bar, and is equipped with a pipe end regulating piece that abuts against the end face of a metal pipe inserted into the selected piping holding hole from the underside, and is equipped with a magnet or a magnet that is magnetically attracted to the gauge bar.

2. 2. The piping end surface restricting device according to claim 1, characterized in that the piping end surface restricting device is composed of the pipe end restricting piece, a side piece arranged along one side of the gauge bar, and a bottom surface piece arranged along the bottom surface of the gauge bar, and an upper end of the side surface piece is connected to one end of the pipe end restricting piece, and a lower end of the side surface piece is connected to one end of the bottom surface piece.

3. The pipe end face regulating device according to claim 1, characterized in that the pipe end face regulating device is composed of the pipe end regulating piece and a side piece arranged along one side of the gauge bar, and an upper end of the side piece is connected to one end of the pipe end regulating piece.

4. 4. A flare forming tool comprising: a gauge bar having a plurality of pipe retaining holes penetrating from a lower surface to an upper surface thereof and retaining an end of a metal pipe; a yoke body attached to the gauge bar, sliding along a longitudinal direction of the gauge bar, and holding a conical eccentric cone that presses an end of the metal pipe against a flared surface of the pipe retaining hole to form a flare; and the pipe end face restricting device according to any one of claims 1 to 3, sliding along the longitudinal direction of the gauge bar and aligning an end face of the metal pipe with an upper surface of the gauge bar on which the flared surface is formed.

Images