Flare forming tool

Abstract

To provide a flare forming tool capable of generating a stable applied pressure and reducing a torque for rotating a main shaft.SOLUTION: A flare forming tool 10 includes: a flare holder 56; a main shaft 14 arranged inside the flare holder 56, and including a feed screw part 52 having a tip portion 50 and formed with a male screw at a rear end side; a flare cone 12 arranged in the tip portion 50 eccentrically to the main shaft 14; a plurality of pressure springs 76 extending along the shaft direction outside the main shaft 14, and arranged along the circumferential direction; a clutch flange 66 including in the central part, a main shaft receiving part 96 having an inner peripheral part formed with a female screw screwed with the feed screw part 52 of the main shaft 14, and including a front side support part 92 for supporting the front ends of the pressure springs 76 along the outer peripheral part; a pressure spring receiver 60 for supporting the rear ends of the pressure springs 76 rotatably around the shaft direction of the main shaft 14; and a drive mechanism 22 for rotating the main shaft 14.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flare forming tool. [Background technology]

[0002] Conventionally, manual or electric flare forming tools have been used to expand the diameter of the end of a copper pipe into a conical shape and form a flare. For example, Patent Document 1 discloses an electric flare forming tool including a main shaft with a tip-end enlarged portion formed at its tip, a flare cone rotatably supported on the tip-end enlarged portion, and a pipe clamp detachably attached to the tip of a housing, and which forms a flare at the tip of a pipe held by the pipe clamp by rotating a motor. In this tool, the main shaft is slidably spline-coupled to the shaft of the final gear of a gear reduction device. The main shaft also includes a clutch fixed to the main shaft, a feed screw shaft engaged with and disengaged from the clutch and threadedly engaged with a female thread formed in the housing, and a pressure spring inserted between the feed screw shaft and the tip-end enlarged portion.

[0003] However, in the flare forming tool described in Patent Document 1, the pressure force depends on the performance of a single pressure spring. When advancing the flare cone to the front end to form the flare, the pressure spring must apply strong pressure to the main shaft. However, the spring load varies within the tolerance, and this variation affects the difference in pressure force. This can result in variations in the accuracy of the flare forming. Furthermore, the main shaft passes through the pressure spring, and the feed screw shaft is positioned to cover the main shaft and pressure spring. This requires a certain increase in the thread diameter of the feed screw shaft, which can increase the torque required to rotate the main shaft and feed screw shaft. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-126931 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a flare forming tool that can generate a stable pressure force and reduce the torque required to rotate the spindle. [Means for solving the problem]

[0006] According to one aspect of the present invention, a flare forming tool for forming a flare on an end of a pipe to be processed includes: a flare holder disposed inside a housing, and a pipe clamp for clamping the pipe to be processed disposed detachably at the tip end; a main shaft disposed inside the flare holder so as to be movable back and forth along the axial direction, and having a cylindrical tip end portion and a feed screw portion with a male thread formed at the rear end portion; a flare cone disposed eccentrically with respect to the axial center of the main shaft at the tip end and rotatable; and a flare cone extending along the axial direction of the main shaft on the outside of the main shaft and rotatable in the circumferential direction of the main shaft. a clutch flange that is disposed inside the flare holder and has a cylindrical main bearing portion that has an inner peripheral portion at the center thereof and a female thread that screws into the feed screw portion of the main shaft, and that has a front support portion that supports the front ends of the plurality of pressure means along the outer peripheral portion; a through hole formed in the center and into which the main shaft is rotatably inserted; a pressure means receiving portion that has a rotating means that is rotatable around the axial direction of the main shaft and supports the rear ends of the plurality of pressure means via the rotating means; and a drive mechanism that rotates the main shaft.

[0007] Furthermore, according to another aspect of the present invention, a support member may be provided which is disposed between the clutch flange and the pressure means receiving portion and has a plurality of pressure means holding portions formed along the outer peripheral shape of the pressure means.

[0008] According to another aspect of the present invention, the clutch flange may include a clutch pin receiver extending from its front surface toward the axial front side of the main shaft, and the flare holder may include a clutch pin whose rear end is connected to the pressure means receiver portion and which is disposed on the front side of the clutch flange and is engageable with the clutch pin receiver, and pin biasing means which biases the clutch pin toward the axial rear side of the main shaft.

[0009] Furthermore, according to another aspect of the present invention, the clutch flange may include, on its outer portion, a torsion spring collision portion extending radially outward from the main shaft, one end of which is fixed inside the housing, and the other end of which may include a torsion spring arranged to collide with the torsion spring collision portion of the clutch flange, which is offset axially rearward of the main shaft when the flare cone abuts against the pipe to be processed and the main shaft is rotated with its forward movement restricted. [Effects of the Invention]

[0010] In the flare forming tool according to the present invention, the main shaft rotated by the drive mechanism moves (advances) axially forward while its feed screw portion threads into the main bearing portion of the clutch flange. When the advanced flare cone abuts against the pipe to be processed and flare formation begins, the main shaft attempts to rotate while its forward movement is hindered, and the clutch flange, to which the main shaft is threaded, is offset axially rearward. As a result, the multiple pressure means supported by the clutch flange are compressed, generating a spring reaction force toward their front end (the clutch flange side). This spring reaction force acts on the main shaft threaded into the main bearing portion, allowing the main shaft to pressurize the pipe to be processed via the flare cone. Furthermore, when the clutch flange is offset to a predetermined position, for example, to a position where there is nothing to lock it, it rotates together with the main shaft. Once the clutch flange begins to rotate together with the main shaft, it is no longer offset, and the pressure means is compressed, maintaining the spring reaction force and rotating together with the clutch flange and the rotating means. Here, since multiple pressure means are provided, the required pressure can be shared among the pressure means. Therefore, the pressure shared by each pressure means can be set to avoid the range of fluctuations due to the pressure tolerance of the pressure means, allowing for stable generation of pressure. Furthermore, the feed screw portion is formed at the rear end of the spindle, and the multiple pressure means are arranged outside the spindle along the circumferential direction. Therefore, compared to a case where the feed screw shaft is formed to cover the spindle and pressure spring, as in the flare forming tool disclosed in Patent Document 1, for example, the diameters of the feed screw portion and the spindle can be made smaller. This allows for a reduction in the torque required to rotate the spindle compared to a case where the same pressure is generated using an existing tool, such as the flare forming tool disclosed in Patent Document 1.

[0011] According to another aspect of the present invention, a support member is provided that is disposed between the clutch flange and the pressure means receiving portion and has a plurality of pressure means holding portions formed along the outer circumferential shape of the pressure means. Therefore, even when the pressure means is disposed without passing through any shaft, the position of the pressure means can be stabilized and play can be reduced, enabling stable pressure application to the processed pipe via the flare cone.

[0012] According to another aspect of the present invention, the clutch flange with the clutch pin receiver is disposed inside a flare holder that includes a clutch pin and has a rear end connected to the pressure means receiver. This allows the clutch flange, with the clutch pin receiver engaged by the clutch pin, to be stably disposed inside the flare holder, and further allows the main shaft, which is threaded into the main bearing portion of the clutch flange, to be stably disposed in the flare holder.

[0013] According to another aspect of the present invention, the clutch flange has a torsion spring collision portion on its outer side that extends radially outward from the main shaft, and the flare forming tool includes a torsion spring that has one end fixed inside a housing and the other end positioned to collide with the torsion spring collision portion of the clutch flange that is offset axially rearward from the main shaft. This allows the torsion spring collision portion of the clutch flange to collide with (press against) the torsion spring immediately after rotation begins, generating a collision sound. This allows the user to be notified that the clutch flange (clutch mechanism) is operating, even if, for example, the collision sound between the torsion spring and the torsion spring collision portion becomes quiet.

[0014] As described above, the flare forming tool according to the present invention can generate a stable pressing force and reduce torque. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 shows a side view of the flare forming tool according to this embodiment with one side of the housing removed. [Figure 2] FIG. 2 shows a perspective view of the inside of the flare forming tool as seen from the front side. [Figure 3] FIG. 3 shows a perspective view of the inside of the flare forming tool as seen from the rear side. [Figure 4] FIG. 4 shows an exploded perspective view of the flare forming tool. [Figure 5] FIG. 5 shows a cross-sectional view of the processing device part of the flare forming tool taken along the axial direction of the main shaft and the horizontal direction of the tool. [Figure 6] FIG. 6 is a perspective view of the processing device section as seen from the front side. [Figure 7] FIG. 7 is a perspective view of the processing device section as seen from the rear side. [Figure 8A] FIG. 8A shows a perspective view of the support member as seen from the front side. [Figure 8B] FIG. 8B shows a perspective view of the support member as seen from the rear side. [Figure 9] FIG. 9 is a perspective view of the support member on which the pressure spring is arranged, as viewed from the front side. [Figure 10A] FIG. 10A is a perspective view of the clutch flange as seen from the front side. [Figure 10B] FIG. 10B is a perspective view of the clutch flange as seen from the rear side. [Figure 11] FIG. 11 is a perspective view of the clutch flange and the torsion spring as viewed from the front side. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a flare forming tool according to this embodiment will be described with reference to the accompanying drawings. Similar or corresponding elements are designated by the same reference numerals, and duplicated explanations will be omitted. For ease of understanding, the scale of the drawings may be changed. Furthermore, the flare forming tool shown in the accompanying drawings is an example, and flare forming tools of different dimensions may be formed.

[0017] FIG. 1 shows a side view of a flare forming tool 10 according to this embodiment. The flare forming tool 10 is a manual or power tool for forming a flare by expanding the diameter of the end of a pipe (e.g., a copper pipe) into a conical shape. An electric flare forming tool 10 is shown here as an example. In the figure, arrows indicate the tool front-rear direction, which is the direction in which a spindle 14 (see FIG. 2) having a flare cone 12 at its tip for expanding the diameter of the end of the pipe (not shown) moves forward and backward, the device width direction, and the tool up-down direction. In the figure, FR indicates the front side of the tool, W (see FIG. 2) indicates the tool width direction, and UP indicates the tool up-down direction.

[0018] 1 has a pistol-shaped housing 16 with a grip 18 on the lower side of the tool for a user to hold. A rechargeable battery 20 is disposed on the lower side of the housing 16, and a drive mechanism 22 is provided on the upper side of the battery 20. The drive mechanism 22 is connected to the battery 20 and drives (rotates) the metallic flare cone 12 and main shaft 14.

[0019] 1 and 2, the drive mechanism 22 includes a motor 30 connected to the battery 20 via a forward / reverse switch 28, and a gear reduction mechanism 32 that is driven by the motor 30 and rotates the main shaft 14. Specifically, the gear reduction mechanism 32 includes a first pinion 34 directly connected to the rotation shaft of the motor 30, a first gear 36 connected to the first pinion 34, a second gear 38 connected to the first gear 36 via a second pinion 37 disposed on the rotation shaft of the first gear 36, and a spline bearing 40 connected to the second gear 38.

[0020] 3, a spline 42 is connected to the tool rear end side of the spindle 14, and the tool rear end side to which the spline 42 is attached is connected to a spline bearing 40 (see FIG. 2), so that the spindle 14 can rotate and move back and forth. In addition, on the tool rear side of the spline 42 inserted into the spline bearing 40, an auxiliary spring 44 is arranged along the axial direction of the spindle 14 to assist in applying pressure to the tool front side of the spindle 14.

[0021] 1, a processing device unit 46 for forming a flare is provided above the flare forming tool 10. As shown in Fig. 4, the processing device unit 46 is made up of the main shaft 14, which is a movable part, a clutch flange 66 and a pressure spring 76, which will be described later, and the like, and a holder unit 48 that houses these components therein.

[0022] The spindle 14 has a cylindrical outer periphery and includes a tip portion 50 on which the flare cone 12 for expanding the diameter of the pipe is rotatably disposed, and a rear end portion which includes a feed screw portion 52 having a male thread formed on the outer periphery. A retaining ring 54 is attached to the rear side of the spindle 14 to prevent the spline 42 connected to the rear side of the tool from falling off. Note that while the retaining ring 54 is described here as being used to prevent the spline 42 from falling off, this is not limiting, and parts other than a retaining ring, such as a roll pin or a nut, may also be used to prevent the spline 42 from falling off.

[0023] As shown in Figures 4 and 5, the holder portion 48 is arranged on the front side of the tool and is composed of a metallic flare holder 56 having a cylindrical outer periphery, and a pressure spring receiver 60 serving as a pressure means receiver, which is a square metal plate when viewed from the front and whose four corners are connected to the rear end of the flare holder 56 via hexagonal bolts 58.

[0024] As shown in FIG. 6, the flare holder 56 is comprised of a cylindrical tip housing portion 56A formed on the front side of the tool and configured to house a pipe clamp (not shown), and a cylindrical rear holder portion 56B formed contiguous with the tip housing portion 56A on the rear side of the tool. The rear holder portion 56B has openings on both sides in the tool width direction and on the upper and lower sides of the tool. A cone-side needle bearing 62 (see FIG. 5) is disposed inside the tip housing portion 56A, and the spindle 14 is housed (disposed) inside the holder portion 48 via the cone-side needle bearing 62. As shown in FIG. 7, a pressure-receiving portion 64 is formed on the rear side of the tool of the tip housing portion 56A, against which a clutch flange 66 (described later) abuts.

[0025] As shown in FIGS. 4 and 5 , a cylindrical bearing mounting portion 68 protruding toward the front of the tool is formed on the front surface of the pressure spring holder 60, and a through-hole for inserting the spindle 14 is formed from the inner periphery of the bearing mounting portion 68 to the pressure spring holder 60. An annular front thrust needle bearing 70 (rotation means) is disposed on the outer periphery of the bearing mounting portion 68, the inner periphery of which is formed substantially identical to the outer periphery of the bearing mounting portion 68 and is rotatable around the bearing mounting portion 68. A circular recess is formed on the rear surface of the pressure spring holder 60 in rear view, and an annular rear thrust needle bearing 72 is disposed inside the recess, the outer periphery of which is formed substantially identical to the inner periphery of the recess. When the spindle 14 is advanced, the spline 42 is locked by the rear thrust needle bearing 72. Therefore, when no machining is being performed (when the pipe clamp is not housed), the spindle 14 is locked in this state and cannot advance any further when driven forward.

[0026] Arranged inside the holder portion 48 formed by the flare holder 56 and the pressure spring receiver 60 are a metal clutch flange 66, a metal or resin support member 74, and a plurality of pressure springs 76 serving as pressure applying means. The clutch flange 66 is arranged in a state exposed from both sides of the rear holder 56B in the tool width direction and from openings on the upper and lower sides of the tool. Here, the pressure springs 76 are coil springs, and six coil springs are provided. Note that, in the following description, six pressure springs 76 are described as being provided, but this is not limiting. For example, other pressure applying means such as a solenoid may be used, and more or fewer than six springs may be provided.

[0027] A support member 74 having a cylindrical outer periphery is disposed on the front side of the front thrust needle bearing 70. As shown in FIGS. 8A and 8B , the support member 74 has a front protrusion 78 formed on its front surface that protrudes toward the front side of the tool and is adapted to couple (fit) with the clutch flange 66. Pressure spring holders 80 are formed on the outer periphery of the support member 74 at equal intervals along the circumferential direction (here, at 60-degree intervals, since there are six pressure springs 76). The pressure spring holders 80 are molded to penetrate the support member 74 in the front-to-rear direction (thickness direction) of the tool, and their inner periphery is shaped to match the outer periphery of the pressure spring 76 so that the pressure spring 76 can be accommodated therein.

[0028] 9, a through-hole 82 that is circular in front view and extends in the tool front-rear direction (thickness direction) is formed in the center of the support member 74. The bearing mounting portion 68 is inserted into the through-hole 82, and a needle bearing 84 (see FIG. 5) is inserted inside the bearing mounting portion 68.

[0029] As shown in FIG. 5, the pressure spring 76 is housed in the pressure spring holding portion 80 of the support member 74, and the clutch flange 66 is disposed on the tool front side of the support member 74.

[0030] 10A, a clutch pin receiver 86 is formed on the outer edge of the front surface of the clutch flange 66, protruding toward the front of the tool. A cylindrical protruding portion 88 is formed on the center of the front surface of the clutch flange 66, protruding toward the front of the tool. The front surface of the clutch pin receiver 86 and the front end of the protruding portion 88 are configured to come into contact with the pressure-receiving portion 64 of the flare holder 56 when the clutch flange 66 is disposed inside the flare holder 56. Specifically, the pressure-receiving portion 64 is formed along the outer peripheral shape of the front end of the protruding portion 88. A torsion spring collision portion 99 is formed on the outer side of the clutch flange 66, extending radially outward from the main shaft 14 and configured to be able to collide with (engage with) a clutch pin 90, which will be described later.

[0031] 10B, on the tool rear side of the clutch flange 66, front support portions 92 that support the front ends of the pressure springs 76 are formed at equal intervals in the circumferential direction (here, at 60-degree intervals because there are six pressure springs 76) and at positions facing the pressure spring holding portions 80. In addition, the clutch flange 66 is formed to pass through at a position facing the front protrusion 78 of the support member 74 and is provided with a fitting portion 94 for connecting (fitting) with the front protrusion 78.

[0032] A cylindrical main bearing portion 96 is formed in the center of the clutch flange 66. The cylindrical main bearing portion 96 is formed in a cylindrical shape that protrudes toward the rear side of the tool and into which the main shaft 14 is inserted. A female thread is formed on the inner periphery of the main bearing portion 96, and is configured to screw into the feed screw portion 52 of the main shaft 14 inserted into the main bearing portion 96.

[0033] As shown in Figure 11, clutch pins 90 extending toward the rear of the tool are disposed on both sides of rear holder 56B of flare holder 56 (see Figure 5) in the tool width direction at positions facing clutch flange 66 exposed from the opening. A biasing spring 100 is disposed on the tool front side of clutch pin 90 as pin biasing means that biases clutch pin 90 toward the rear of the tool. Therefore, clutch flange 66 is stably disposed inside flare holder 56 with clutch pin receiver 86 engaged with clutch pin 90.

[0034] A torsion spring 102 is disposed on the tool lower side of flare holder 56. One end 102A is fixed inside housing 16, and the other end 102B is located on the tool rear side of clutch flange 66. The position of the other end 102B is adjusted so that it is in the same position in the tool front-to-rear direction as torsion spring collision portion 99 of clutch flange 66 when it is offset toward the tool rear side. In addition, the other end of torsion spring 102 is bent toward the tool upper side so that it will collide with torsion spring collision portion 99 offset toward the tool rear side.

[0035] Next, the operation and effects of this embodiment will be described below.

[0036] In the flare forming tool 10 according to this embodiment, when a user activates the drive mechanism 22 via the forward / reverse switch 28, the motor 30 is activated, causing the spindle 14 to rotate. The rotated spindle 14 moves forward (advance) while its feed screw portion 52 is threadedly engaged with the main bearing portion 96 of the clutch flange 66. When the flare cone 12 contacts the pipe to be processed and flare formation begins, the spindle 14 attempts to rotate while its forward movement is hindered. As a result, the clutch flange 66, to which the spindle 14 is threaded, is offset toward the rear of the tool. As a result, the six compression springs 76 supported by the clutch flange 66 are compressed, generating a spring reaction force toward the front of the tool. The generated spring reaction force acts on the spindle 14, which is threadedly engaged with the main bearing portion 96, and the spindle 14 can apply pressure to the pipe to be processed via the flare cone 12. Furthermore, when the clutch flange 66 is offset toward the rear of the tool to a position where the clutch pin 90 can no longer engage the clutch pin receiver 86, the clutch flange 66 rotates together with the spindle 14. Once the clutch flange 66 begins to rotate together with the spindle 14, it is no longer offset, and the pressure spring 76 rotates together with the clutch flange 66 and the front thrust needle bearing 70 while being compressed and maintaining a spring reaction force. Here, because a plurality of pressure springs 76 are provided, the required pressure force can be shared by each pressure spring 76. For this reason, the pressure force shared by each pressure spring 76 can be set outside the range that can vary due to the tolerance of the pressure force (spring force) of the pressure spring 76, that is, at a load that is smaller than the lower limit of the range of variation, and a stable pressure force can be generated.

[0037] Furthermore, feed screw portion 52 is formed on the rear end side of spindle 14, and multiple pressure springs 76 are arranged outside of spindle 14 along the circumferential direction. Therefore, compared to a case in which a feed screw shaft is formed to cover the spindle and pressure springs, such as in the flare forming tool disclosed in Patent Document 1, for example, the shaft diameters of feed screw portion 52 and spindle 14 can be made smaller. This allows for a reduction in the torque required to rotate spindle 14, compared to a case in which the same pressure force is generated using an existing tool such as the flare forming tool disclosed in Patent Document 1.

[0038] Moreover, by providing multiple (six) pressure springs 76 and arranging them outside the main spindle 14, other components can be arranged near the main spindle 14. Furthermore, by providing multiple pressure springs 76, the pressure force borne by each pressure spring 76 can be reduced, and therefore the outer diameter and / or length can be reduced, thereby making the dimensions smaller. As a result, the dimensions of the processing device unit 46 arranged inside the housing 16 can be reduced, and therefore the flare forming tool 10 can be made smaller and lighter.

[0039] Furthermore, according to the flare forming tool 10 of this embodiment, a support member 74 having a pressure spring holding portion 80 is disposed between the clutch flange 66 and the pressure spring receiver 60. Therefore, even when the pressure spring 76 is disposed without passing through any shaft, the position of the pressure spring 76 can be stabilized and play can be reduced, allowing stable pressure to be applied to the processed pipe via the flare cone 12.

[0040] Furthermore, according to the flare forming tool 10 of this embodiment, the clutch flange 66 equipped with the clutch pin receiver 86 includes a clutch pin 90 engageable with the clutch pin receiver 86, and is disposed inside the flare holder 56 whose rear end is connected to the pressure spring receiver 60. Therefore, the clutch flange 66, with the clutch pin receiver 86 locked by the clutch pin 90, can be stably disposed inside the flare holder 56, and further, the main shaft 14 threadedly engaged with the main bearing portion 96 of the clutch flange 66 can be stably disposed in the flare holder 56.

[0041] Furthermore, with the flare forming tool 10 according to this embodiment, the clutch pin receiver 86 of the clutch flange 66 can be positioned radially away from the center of the flare holder 56 (from the main shaft 14). This allows for a relative increase in torque at the position of the clutch pin receiver 86, thereby reducing the force required for the clutch pin 90 to overcome the clutch pin receiver 86 of the clutch flange 66 that has been offset and begun to rotate. This reduces the impact noise generated when the clutch pin 90 overcomes the clutch pin receiver 86, making it less likely for the user to notice that the clutch mechanism is operating, i.e., that the main shaft 14 has been fully advanced toward the front of the tool. The torsion spring 102, located on the lower side of the flare holder 56, has its other end 102B pressed by the torsion spring collision portion 99 of the rotating clutch flange 66. When the torsion spring collision portion 99 moves (passes), the spring reaction force returns the torsion spring 102 to its original position. During this process, the end 102B collides with the housing 16, generating a noise. As a result, even if the collision sound between the clutch pin 90 and the clutch pin receiver 86 becomes small, the collision sound between the torsion spring 102 and the torsion spring collision portion 99 can inform the user that the clutch mechanism is operating.

[0042] From the above, the flare forming tool 10 according to this embodiment can generate a stable pressure force and reduce torque.

[0043] Furthermore, according to the flare forming tool 10 of this embodiment, the holder portion 48 has a structure in which the rear end portion of the flare holder 56, in which the clutch flange 66 and the main shaft 14 are disposed, is simply screwed (connected) to the pressure spring bearing 60 with a hexagon bolt 58. Therefore, assembly can be easily performed without using special tools that would be required, for example, when fixing a clutch to the main shaft.

[0044] Here, the flare forming tool 10 has been described as being electrically driven, but this is not limited thereto. Since the spindle can be driven with low torque, a flare forming tool that can be driven manually or using a known (commercially available) drill may also be configured.

[0045] Although the embodiment of the flare forming tool 10 has been described above, the present invention is not limited to the above embodiment. Various modifications of the above embodiment are included in the embodiments of the present invention within the scope of those skilled in the art. [Explanation of symbols]

[0046] 10 Flare forming tool 12 Flare Cone 14 Spindle 16 Case 50 Tip 52 Lead screw section 60 Pressure spring receiver (pressure means receiver) 66 Clutch flange 70 Front thrust needle bearing (rotating means) 74 Support material 76 Pressure spring (pressure means) 80 Pressure spring holding portion (pressure means holding portion) 86 Clutch pin holder 90 Clutch pin 92 Front support part 96 Main bearing 99 Torsion spring collision part 100 biasing spring (pin biasing means) 102 Torsion spring 102A One end 102B other end

Claims

1. 1. A flare forming tool for forming a flare on an end of a pipe to be processed, comprising: a flare holder disposed inside the housing, the flare holder having a pipe clamp detachably disposed at the tip end thereof for clamping the pipe to be processed; a main shaft that is disposed inside the flare holder so as to be movable back and forth along the axial direction, the main shaft having a leading end portion with a cylindrical outer circumferential shape and a feed screw portion having a male screw formed on a rear end side; a rotatable flare cone disposed eccentrically with respect to the axis of the main shaft at the tip end; a plurality of pressure means extending along the axial direction of the spindle on the outside of the spindle and arranged along the circumferential direction of the spindle; a clutch flange disposed inside the flare holder, the clutch flange including a cylindrical main bearing portion having an inner peripheral portion formed with a female thread at the center thereof, the female thread being adapted to be threadedly engaged with the feed screw portion of the main shaft, and a front support portion along an outer peripheral portion thereof for supporting front ends of the plurality of pressure means; a pressure means receiving portion that is connected to a rear end of the flare holder and that supports rear ends of the pressure means via the rotation means; the pressure means receiving portion having a through hole formed in a central portion, into which the main shaft is rotatably inserted, and a rotation means that is rotatable around the axial direction of the main shaft; a drive mechanism that rotates the main shaft; A flare forming tool comprising:

2. A flare forming tool for forming a flare on an end of a pipe to be processed, comprising: a flare holder disposed inside the housing, the flare holder having a pipe clamp detachably disposed at the tip end thereof for clamping the pipe to be processed; a main shaft that is disposed inside the flare holder so as to be movable back and forth along the axial direction, the main shaft having a leading end portion with a cylindrical outer circumferential shape and a feed screw portion having a male screw formed on a rear end side; a rotatable flare cone disposed eccentrically with respect to the axis of the main shaft at the tip end; a plurality of pressure means extending along the axial direction of the spindle on the outside of the spindle and arranged along the circumferential direction of the spindle; a clutch flange disposed inside the flare holder, the clutch flange including a cylindrical main bearing portion having an inner peripheral portion formed with a female thread at the center thereof, the female thread being adapted to be threadedly engaged with the feed screw portion of the main shaft, and a front support portion along an outer peripheral portion thereof for supporting front ends of the plurality of pressure means; a pressure means receiving portion that is connected to a rear end of the flare holder and that supports rear ends of the pressure means via the rotation means; the pressure means receiving portion having a through hole formed in a central portion, into which the main shaft is rotatably inserted, and a rotation means that is rotatable around the axial direction of the main shaft; A flare forming tool comprising:

3. 3. The flare forming tool according to claim 1, further comprising a support member disposed between the clutch flange and the pressure means receiving portion, the support member having a plurality of pressure means holding portions formed along the outer peripheral shape of the pressure means.

4. the clutch flange includes a clutch pin receiver extending from a front surface thereof toward the axial front side of the main shaft, 4. The flare forming tool according to claim 1, wherein the flare holder comprises: a clutch pin whose rear end is connected to the pressure means receiving portion, the clutch pin being disposed on the front side of the clutch flange and engageable with the clutch pin receiver; and pin biasing means that biases the clutch pin toward the rear side in the axial direction of the main shaft.

5. The clutch flange has an outer portion provided with a torsion spring collision portion extending radially outward from the main shaft, 5. The flare forming tool according to claim 1, further comprising a torsion spring having one end fixed inside the housing and the other end arranged to collide with the torsion spring collision portion of the clutch flange, which is offset axially rearward of the main shaft by rotation of the main shaft with forward movement restricted when the flare cone abuts the pipe to be processed.

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