KR20180028228A - Portable pipe threading machine - Google Patents

Abstract

The present invention relates to a portable pipe machine, which comprises: a dies head having a first surface and a second surface opposite to the first surface; and a driving unit for rotating the dies head. The driving unit has a housing, wherein a torque amplification means is stored. The torque amplification means has at least a driving gear and a driven gear. The driving gear can be coupled to be rotated on an inner wall of the housing. A shaft of the driving gear has a concave unit or a protrusion unit in a polygon shape provided on one end thereof. A first surface of the dies head can be coupled to the driven gear to be rotated in the coaxial direction with the driven gear. The polygon-shaped concave unit or the polygon-shaped protrusion unit formed on the shaft of the driving gear can be coupled with an external driving source such as a rotation shaft of an electric drill. According to the present invention, the electric drill and the pipe machine can be portable to process a pipe while moving places.

Description

[0001] PORTABLE PIPE THREADING MACHINE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe machine, and more particularly, to a portable pipe threading machine.

Pipe machines are piping tools used to fasten dies and pipe reamers, and to thread a pipe. Also known as pipe thread cutting machine or pipe thread machine.

Pipe machines are used to fasten dies to the die heads and to screw them into the pipe. Depending on the drive type, there are hand-operated pipe machines that are hand-operated, gear-driven pipe machines driven by gears, Belt-type pipe machines and the like.

As a classification according to the power source, a pipe machine used by using the hand power can be classified as a manual pipe machine and a pipe machine operated by the power of an electric motor as an electric pipe machine.

Dice heads are usually numbered from 1 to 4, and the operator sets the dice to the number and fastens them to the die head. The die head has a lever that is used to fasten the die. When inserting the dice, please twist the lever to one side, and pull it out to the other side.

When looking at the front of the pipe worker's work, mainly on the left side there is a pipe front support and a back support to fix the pipe. The pipe cutter is attached to the right side of the support so that the pipe can be cut directly from the pipe machine. On the right side of the pipe cutter, there is a die head, which is used for screwing on the outer surface of the pipe. On the far right is a pipe reamer, which is used to trim the cut surface of the pipe. If the pipe is cut, the cutter must be trimmed after finishing the cut with the reamer before threading. This is because the screws may be broken if the work is done after cutting the screws first.

The electric pipe machine mainly used at present includes all of the front support A and the rear support B, the pipe cutter H, the die head J and the reamer I as shown in Fig. 1, and the cutter H The die head J and the reamer I are configured to be rotated about the carriage arm F so that the operator can process the pipe fixed to the support as required.

Such conventional electromechanical pipe machines weigh from about 50 kg to 160 kg of the overall assembly and are usually carried on conveying equipment at industrial sites. However, such a conventional electric pipe machine has no problem when a large number of pipes are machined by a worker, but when a worker moves several places and a small amount of pipes are to be machined as needed, the drawback is that it is too heavy to carry . That is, in order to reduce the copper wire while using the conventional electric pipe machine, it is necessary to use a method of carrying heavy heavy electric pipe machine or transporting only the pipe at a time where the electric pipe machine is used in one day , Which causes many inconveniences to the operator.

As an alternative to solve these drawbacks, there is a relatively easy-to-carry passive pipe machine, but it does not have the advantage of an electric pipe machine that reduces the power of the worker. to be.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe machine configured to receive a torque of an external power source without having its own motor, .

According to an aspect of the present invention, there is provided a portable pipe machine including a die head including a first surface and a second surface opposite to the first surface, and a driving unit for rotating the die head Wherein the driving unit includes a housing and a torque amplifying unit accommodated in the housing, the torque amplifying unit includes at least a driving gear and a driven gear, the driving gear is rotatably coupled to the inner wall of the housing, The shaft shaft of the gear includes a polygonal recess or protrusion at one end, and the first surface of the die head is engaged with the driven gear so as to coaxially rotate with the driven gear.

The polygonal recess or protrusion formed on the shaft of the drive gear is configured to engage with a rotating shaft of an external power source, for example, an electric drill. The bit shape of the electric drill rotating shaft can be selected from a variety of shapes such as a cross shape, a straight shape, and a hexagon shape.

When the concave portion is formed on the shaft shaft, the protruding shape of the bit of the electric drill that matches the concave portion is selected and inserted, and the electric drill is operated to rotate the die head. After the pipe is inserted into the die head equipped with the dice, the threading starts when the die head starts rotating.

Conversely, when the protruding portion is formed on the shaft shaft, it is possible to rotate the die head by inserting and inserting a concave shape of the bit of the electric drill into the concave shape to operate the electric drill.

Preferably, it may further comprise a fixing portion having a tightening member for fixing the pipe. For correct pipe machining, the pipe must be fixed and machined. Therefore, in the case of a portable pipe machine, it is preferable to include a fixed portion. Of course, it is not necessary for the pipe machine to have a fixing part if it is provided with any tool capable of fixing the other end of the pipe in order to machine one end of the pipe, but it is preferable for the portable purpose of the present invention to include the fixing part. The shape of the fixing part may be a chain type chuck or may be a hydraulic type, and other fixing parts may be used if the driving part can maintain sufficient fixing force.

The fixing part is disposed to face the second surface of the die head so that the axis on which the pipe is fixed coincides with the rotation axis of the die head. If the shafts of the fixed part and the die head (or the driving part) are twisted, the threading may be distorted, the pipe may be deformed, or the pipe machine may not operate smoothly.

The portable pipe machine according to the present embodiment may further include a hub extending in the rotation axis direction of the die head. The hub serves to maintain the axis during the machining of the pipe and the matching of the axes between the fixed and die heads mentioned above. Therefore, the gap between the die head and the fixing part is shortened according to the degree of machining while the pipe is being machined into the die head. Therefore, it is preferable that the fixing part and the driving part are coupled to the hub and slidable in the direction of the axis of rotation.

To this end, the hub may have a cylindrical shape, and the fixing portion and the driving portion may include a plurality of guide grooves extending on the outer circumferential surface in the rotational axis direction. In order to cope with this, the hub may include a plurality of guide projections on the inner circumferential surface. The guide protrusion is inserted into the guide groove of the fixing part and the driving part so that the fixing part and the driving part slide in the rotation axis direction.

Conversely, the fixing portion and the driving portion may include a plurality of guide protrusions on the outer circumferential surface, and the hub may include a plurality of guide grooves on the inner circumferential surface thereof. This structure is also such that it is slidable in the direction of the rotation axis in a state where the axes of the fixed portion and the driving portion coincide with each other.

At least one opening may be formed in the circumferential surface of the hub so that the degree of processing of the pipe can be visually confirmed or sprayed with cooling oil. The hub may include an oil pan at the bottom or another opening to allow the oil to flow down at the bottom so that the injected cooling oil is collected. If you include another opening in the bottom, you will need a separate oil pan.

The hub may include a folded portion along the rotational axis direction and a clamping portion. The hub may be manufactured in a state of being preassembled with the fixing part and the driving part, but may include a folding part and a clamping part for convenience of carrying. If the clamping part and the clamping part are included, the fixing part, the hub, and the driving part can be separately transported and assembled directly at the work site, and then used.

A portable pipe machine according to another embodiment of the present invention includes: a die head including a first surface and a second surface opposite to the first surface; A driving unit for rotating the die head; And a fixing portion having a tightening member for fixing the pipe. Wherein the driving unit includes a housing and a torque amplifying unit accommodated in the housing, wherein the torque amplifying unit includes at least a driving gear and a driven gear, the driving gear is rotatably coupled to the inner wall of the housing, The shaft shaft includes a polygonal recess or protrusion at one end, and the first surface of the die head can be engaged with the driven gear so as to coaxially rotate with the driven gear.

In particular, the fixation portion may include a plurality of support legs, and the drive portion may include a support leg engagement portion that receives the plurality of support legs. The support leg and the support leg engagement portion may be provided for the same role as the hub in the above-mentioned embodiment. That is, the support legs are not fixed in the axial direction so as to be slidable while the pipe is being machined while the axes of the fixed portion and the drive portion are coincided with each other, and the repulsive force applied in the circumferential direction of the drive portion is supported, It serves to maintain the axis.

The tightening member is preferably a screw type. Although this is for the weight and ease of handling of the fastening member, the fastening member may be of the chain type or of the hydraulic type if it is for fixing.

A portable pipe machine according to another embodiment of the present invention includes: a die head including a first surface and a second surface opposite to the first surface; And a driving unit for rotating the die head, wherein the driving unit includes a housing and a torque amplifying unit accommodated in the housing, wherein the torque amplifying unit includes at least a driving gear and a driven gear, A cylindrical bridge is disposed between the driving portions, the bridge is coupled to the first surface of the die head and the driven gear, and a plurality of openings may be formed in the bridge. The bridge is a structure for visually observing the pipe to be processed in the die head or for spraying the oil.

The drive gear is rotatably coupled to the inner wall of the housing, and the shaft shaft of the drive gear may include a polygonal recess or protrusion at one end.

Wherein the bridge includes a first ring coupled with the driven gear, a second ring coupled with the die head, and a framework extending between the first ring and the second ring.

The skeleton may include one or more legs.

The outer diameter of the second ring may be larger than the outer diameter of the first ring to facilitate coupling of the die head, the bridge, and the driving portion. Thus, the second ring may have a plurality of coupling points at a point farther from the origin than the outer diameter of the first ring.

The drive gear and the driven gear may be directly engaged with each other or may be engaged by any power transmitting means, and the power transmitting means may be any one of a gear, a chain, and a belt.

A portable pipe machine according to another embodiment of the present invention includes a drive gear, a driven gear that receives torque from the drive gear, a housing that receives the drive gear and the driven gear, An axis, an axis of the driven gear rotatably fixed to the housing, and a die head screwable to the driven gear. The housing includes an opening, one end of the shaft of the driving gear is exposed through the opening, and one end of the shaft of the driving gear may include a polygonal recess or protrusion.

Preferably, the die head may include an oil supply portion, and the oil supply portion may inject a predetermined amount of oil per hour to cool the heat generated during the pipe machining. Alternatively, the oil supply portion may be attached to the housing to spray the oil to the center of the die head (die and the pipe to be processed) at the upper portion of the die head.

According to an embodiment of the present invention, a pipe can be machined while moving an electric drill and a pipe machine.

1 is a perspective view of a conventional pipe machine.
2 is a front view showing a die head and four dice mounted in the die head;
3 is a front view showing the die head with the die mounted thereon.
4 is a perspective view of a portable pipe machine according to an embodiment of the present invention.
4A is a cross-sectional view of the portable pipe machine shown in FIG.
Fig. 5 is a perspective view of the detailed configuration of the portion A in Fig. 4;
Fig. 6 is a perspective view showing a modification of Fig. 4. Fig.
7 is a perspective view of a portable pipe machine according to an embodiment of the present invention.
8 is a schematic view showing a gear set used in Fig.
Fig. 9 is a perspective view specifically showing the driven gear of Fig. 7;
10 is a perspective view of a portable pipe machine according to an embodiment of the invention.
11 is a perspective view of a portable pipe machine according to an embodiment of the present invention.
12 is a perspective view of a portable pipe machine according to an embodiment of the present invention.
13 is a perspective view showing an example of the coupling relationship between the hub, the fixed portion, and the driving portion.
14 is a perspective view showing an example of the coupling relationship between the hub, the fixed portion, and the driving portion.
15 is a perspective view showing a hub including a folding portion and a clamping portion;

Hereinafter, embodiments of the oil filter module according to the present invention will be described in detail with reference to the accompanying drawings.

A first embodiment of the present invention will be described.

Figures 2 and 3 show the appearance of a typical die 5 and a die head 10. The dice 5 is generally composed of four, but the number may vary as necessary. The die head 10 includes a body 11, a size regulation lever 12, and a dice lever 13. [ Numeral 14 is displayed on one surface of the body 11, and is a display for guiding the dice in accordance with the number of the dice. The operator inserts the dice into the numbers indicated by the numbers, and adjusts the size regulation lever 12 according to the size of the pipe to be cut. Thereafter, when the die lever is turned to the right side in the figure, the die is locked and the pipe can be shaved.

The length of the die lever 13 is not a serious problem. However, in the present invention, since the die head 10 is configured to rotate and components such as a hub can be arranged around the die lever 10, Lt; / RTI > That is, the die head may be manufactured so as to include only the root portion of the die lever 13, and a groove may be formed in the root portion so that the die lever can be rotated by a tool such as a metal rod will be. Or a conventional die head configuration having a configuration that is not a lever type and does not affect the size of the die head may be employed.

4 and 4A illustrate a portable pipe machine according to an embodiment of the present invention. The drive unit 100 includes a rotation unit 30 and a gear unit 40. The gear unit 40 is connected to the electric drill 2 through an opening 22 formed in the housing 21, So that the torque can be transmitted.

Although the die head 10 is shown as being coupled to the rotating portion 30 and being threaded in this embodiment, it should be understood that this can be substituted for bonding strength and convenience. For coupling, the die head 10 includes two coupling holes 15, through which the inserted screws can be engaged with the rotation part 30 and rotated together with the rotation part 30. [

A pipe 6 fixed to an arbitrary fixture is inserted into the die head along an axis indicated by a dotted line in the figure. When the worker holds the handle 29 and rotates the electric drill 2 after being inserted so as to be snapped on the first day of the dice, the drive gear 41 is rotated by the fast rotation speed of the electric drill 2.

Referring to FIG. 5, the gear unit 40 includes a driving gear 41 and a planetary gear 42. That is, when the driving gear 41 is rotated by the drill, the planetary gears 42 around the driving gear 41 rotate in the direction opposite to the driving gear 41. The planetary gears 42 are preferably fixed to the gear fixing portion 24 formed on the housing 21 of the driving portion 100 and configured to rotate. This is because the purpose of the present invention is to rotate the die head indirectly connected to the driven gear 43 by rotating the driven gear 43 to process the pipe.

The driven gear 43 engaged with the planetary gears 42 in the inner teeth can rotate in the same direction as the drive gear 41. As is well known, the torque can be amplified by the gear ratio between the drive gear 41 and the driven gear 43. In the present specification, this is referred to as a torque amplification structure. The driven gear 43 rotates at a high speed while the driven gear 43 rotates slowly and the torque transmitted to the driven gear 43 is small even if the torque of the electric drill rotating the driving gear 41 is small Much larger. Specifically, when the number of revolutions of the electric drill 2 is 1500 rpm and the torque is 20 Nm, if the gear ratio is 10: 1, theoretically, the number of revolutions of the driven gear 43 is 150 rpm, the torque is 200 Nm, Theoretically, the number of revolutions of the driven gear 43 is 15 rpm and the torque is 2000 Nm. In actual machining, the ratio of the number of revolutions is applied as it is, but it should be considered that the torque can be reduced by about 70% in consideration of the friction loss.

It should be understood that the number of teeth of the gears shown in Fig. 5 is only exemplary and can be modified to any extent in consideration of the number of revolutions and torque output.

5, the driven gear 43 is formed as an inner tooth of the rotary part 30 and is configured to rotate in engagement with the planetary gears 42, And includes a screw hole 31 formed therein.

Referring to Fig. 6, a modification of Fig. 5 is shown. Here, the housing 21 may have a larger diameter than the rotation unit 30 and may be configured to cover the rotation unit 30 at least partially. The housing 21 may include a stopper (not shown) which covers the outer periphery of the rotation part 30 and fixes the rotation part in the axial direction so that the rotation part 30 does not move forward while rotating. Accordingly, a circular groove engaging with the stopper may be formed on the outer circumference of the rotary part 30. [

Referring to FIG. 7, a portable pipe machine according to another embodiment of the present invention is shown. The driving portion 100 includes a rotation portion 35 and a gear portion 50 and the gear portion 50 includes a driving gear 51 and particularly a turning gear 52. [ In fact, although the direction changing gear 52 may not be included, it is easy to match the rotating direction of the drill 10 set by the operator with the rotating direction of the die head 10, Is preferable in terms of operator convenience.

The housing 21 is shaped like a snowman and is configured to be able to transmit the rotational force of the electric drill to the driving gear 51 through the opening 22 of the housing. The operator is formed such that the width of the housing is thinner than in the previously described embodiment, and the operator holds the handle 29 formed on the side of the housing 21 and inserts the electric drill into the opening 22 to process the pipe.

Referring to Fig. 8, an example gear ratio can be confirmed. The number of teeth of the driving gear 51 is 10, the number of teeth of the direction switching gear 52 is 8, and the number of teeth of the driven gear 53 is 100. [ Since the number of teeth of the turning gear 52 is not considered in the calculation of the gear ratio, the gear ratio is 100: 10, that is, 10: 1. This is an exemplary configuration only, and the gear ratio may be larger or smaller for proper torque amplification.

Fig. 9 is a perspective view specifically showing the rotation part 35. Fig. The rotating portion 35 may include a driven gear 53 and a disk portion 54 having external teeth and a screw hole 46 may be formed in the disk portion 54.

10 is a perspective view showing another embodiment of the present invention. Except for the same or alternative parts as the previous embodiments, In this embodiment, the opening 22 of the housing 21 is not located on one surface of the housing 21 but is located on the side surface. This is because the worm gear is adopted as the configuration of the gear portion 60 in this embodiment. The drive gear 61 of the worm gear is rotatably connected to the opening 22 in the housing 21. The drive gear 61 meshes with the driven gear 63 of the rotation part 35 and rotates do.

The rotating portion 35 includes a disk portion 64 and a driven gear 63. The disk portion 64 includes a screw hole 36 and is engageable with the die head 10. [

In this embodiment, the housing 21 is configured to cover the die head 10. Preferably, the portion covering the die head 10 can be formed of an oil supply portion, which can help cooling the pipe and the die. Alternatively, it may have a structure in which a separate oil supply portion is mounted on a housing portion covering the die head 10.

11 is a perspective view showing another embodiment of the present invention. Here, since the bevel gear is employed, the opening 22 is formed on the side surface of the housing 21. [ The bevel gear may include a driving gear 71, and the rotating portion 35 may include at least a driven gear 73.

In consideration of the position where the electric drill 2 enters, the handle is preferably formed on the right side of the housing.

A second embodiment of the present invention will be described.

12 is a perspective view showing a second embodiment which can be applied to any of the driving parts of the first embodiment. The driving part 100 on which the die head 10 is mounted has four supporting leg engaging parts 26. A fixing part 200 is shown which is capable of fixing a pipe on the opposite side of the main body 200. The fixing part 200 is composed of a fixing part 210 and supporting legs 220, Four support legs 220 extend in parallel in one direction.

The support leg 220 may be slidably inserted into the support leg engagement portion 26 during operation. The die head 10 and the fixed body 210 are brought close to each other according to the threading of the pipe, so that they can move smoothly in the axial direction so as not to interfere with the machining.

The supporting leg 220 may be formed in a shape other than a cylindrical shape and the supporting leg engaging portion 26 may be formed to correspond to the shape of the supporting leg 220 or to receive the supporting leg 220 .

Although the fixing unit 210 is shown as an example of a hydraulic chuck, the fixing unit may be a screw type or a sieve.

The fixing unit 200 may include a fixing handle 240 extending from the fixing unit 210 to the handle 29 in consideration of the case where only one person is working. The fastener handle 240 is formed in a shape corresponding to the portion to be gripped of the handle 29 so that the fastener handle 240 can be gripped with the handle 29. The operator can grasp the handle 29 and the fixture handle 240 with one hand at the same time and perform threading. Meanwhile, since the support leg 220 can be slid at the support leg engagement portion during the threading, the fixation handle 240 can also be configured to be slidable relative to the fixture body 210.

A third embodiment of the present invention will be described.

Referring to FIGS. 13 and 14, the portable pipe machine includes a driving unit 100, a fixing unit 200, and a hub 300 connecting the driving unit 100 and the fixing unit 200. Since the driving unit 100 can take the configuration of the first embodiment, a description thereof will be omitted.

The hub 300 of the third embodiment is configured to allow the fixed portion 200 and the driving portion 100 to slide on a common axis toward or away from each other. Further, the fixing part 200 and the driving part 100 are held more firmly than the construction of the second embodiment. The driving unit 100 or the fixing unit 200 includes guide grooves 130 and 230 and the hub 300 includes guide protrusions 310. [ The guide protrusion 310 is inserted into the guide grooves 130 and 230 and slides in the guide grooves 130 and 230 to serve as a stopper.

The guide groove and the guide projection may be formed opposite to each other in the hub, the fixed portion, and the drive portion. That is, the hub 300 has a guide groove on the inside thereof, and the driving unit 100 or the fixing unit 200 can have a guide protrusion on the outside thereof.

It is preferable that guide grooves 130 and 230 are formed in both the fixing part 200 and the driving part 100 and the hub 300 includes guide protrusions corresponding to the guide grooves 130 and 230 on both sides Do.

It is preferable that the hub includes the hinge 320 on one side and the screw coupling portions 331 and 332 on the other side so that the driving portion 100 and the fixing portion 200 can be assembled on the inside thereof. The protrusion 310 is located in the guide grooves 130 and 230 of the driving part 100 and the fixing part 200 so that the driving part 100 and the fixing part 200 are fixed in the hub 300, Is configured to be slidable.

The two screw engagement portions 331 and 332 are engaged with each other by the screw 333. Whereby the first hub half 330 and the second hub half 335 can be integrated.

Although not shown, both the first hub half 330 or the second hub half 335, or both halves, may be provided with a large opening for observing the state of pipe threading or spraying cooling oil .

By constructing the hub so as to be assembled and disassembled, the metal scraps generated by machining the pipe are collected inside the hub, and the operator can easily handle the metal scraps.

2: Electric drill
5: Dice
6: pipe
10: Dice head
11: Body
12: Standard adjustment lever
13: Dice lever
14: Dice number
15:
21: Housing
22: aperture
23: inner surface
24: Gear fixing portion
26: support leg coupling portion
29: Handle
30, 35:
31, 36:
40: gear portion
41, 51, 61, 71: drive gear
42: planetary gear
43, 53, 63, 73: driven gear
100:
130, 230: Guide groove
200:
210:
220: Support leg
300: Hub
310: guide projection
320: HINGE
331, 332:
333: Screw
330: first hub half
335: second hub half

Claims (13)

A die head including a first surface and a second surface opposite the first surface; And
And a drive unit for rotating the die head,
Wherein the driving unit includes a housing and a torque amplifying unit accommodated in the housing, wherein the torque amplifying unit includes at least a driving gear and a driven gear, the driving gear is rotatably coupled to the inner wall of the housing, The shaft shaft includes a polygonal concave portion or a protruding portion at one end,
Wherein the first surface of the die head is engaged with the driven gear so as to be coaxially rotatable with the driven gear. The method according to claim 1,
Further comprising a securing portion having a tightening member to secure the pipe. 3. The method of claim 2,
Wherein the fixing portion is disposed so as to face the second surface of the die head so that the axis to which the pipe is fixed coincides with the rotation axis of the die head. The method of claim 3,
Further comprising a hub extending in a rotation axis direction of the die head,
Wherein the fixing portion and the driving portion are coupled to the hub, and are slidable in the direction of the rotation axis. 5. The method of claim 4,
The hub is cylindrical,
Wherein the fixing portion and the driving portion include a plurality of guide grooves extending in the rotation axis direction on the outer peripheral surface,
Wherein the hub includes a plurality of guide projections on an inner circumferential surface thereof, and the guide protrusions are inserted into the guide grooves of the stationary portion and the drive portion so that the stationary portion and the drive portion slide in the direction of the rotation axis. 6. The method of claim 5,
Wherein at least one opening is formed in the circumferential surface of the hub. 6. The method of claim 5,
Wherein the hub includes a folded portion along the rotational axis direction and a clamping portion. 6. The method of claim 5,
Wherein the hub comprises an oil pan at the bottom. A die head including a first surface and a second surface opposite the first surface;
A driving unit for rotating the die head; And
1. A portable pipe machine comprising: a fixing part having a tightening member for fixing a pipe,
Wherein the driving unit includes a housing and a torque amplifying unit accommodated in the housing, wherein the torque amplifying unit includes at least a driving gear and a driven gear, the driving gear is rotatably coupled to the inner wall of the housing, The shaft shaft includes a polygonal concave portion or a protruding portion at one end,
Wherein the first surface of the die head is coupled to the driven gear so as to be coaxial with the driven gear,
Wherein the fastening portion includes a plurality of support legs, and the drive portion includes a support leg engagement portion for receiving the plurality of support legs. A die head including a first surface and a second surface opposite the first surface; And
And a drive unit for rotating the die head,
Wherein the driving portion includes a housing and torque amplification means accommodated in the housing, the torque amplification means includes at least a driving gear and a driven gear,
Wherein a cylindrical hub is disposed between the die head and the drive unit, the hub is coupled to the first surface of the die head and the driven gear, a plurality of openings are formed in the hub,
Wherein the drive gear is rotatably coupled to the inner wall of the housing, and the shaft shaft of the drive gear includes a polygonal recess or protrusion at one end. 11. The method of claim 10,
The hub including a first ring coupled with the driven gear, a second ring coupled with the die head, and a framework extending between the first ring and the second ring. 12. The method of claim 11,
Wherein the skeleton comprises at least one leg. A drive gear, a driven gear that receives torque from the drive gear, a housing that receives the drive gear and the driven gear, a shaft of the drive gear that is rotatably fixed to the housing, And a die head screwable to the driven gear,
Wherein the housing includes an opening, one end of the shaft of the drive gear is exposed through the opening, and one end of the shaft of the drive gear includes a polygonal recess or protrusion.

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